JP6380866B2 - Power storage element and power storage device - Google Patents

Description

  The present invention relates to a power storage device and a power storage device including a gas discharge valve.

  In recent years, batteries (lithium ion batteries, nickel metal hydride batteries, etc.) and capacitors (electric double layer capacitors, etc.) are used as power sources for vehicles (automobiles, motorcycles, etc.) and various devices (mobile terminals, notebook computers, etc.). Possible power storage elements are employed. This type of power storage device includes an electrode body including a positive electrode plate and a negative electrode plate that are insulated from each other, a case that houses the electrode body, and an external body that is disposed on the outer surface of the case and is electrically connected to the electrode body Terminal.

  This type of power storage element includes a gas discharge valve that releases the internal pressure by cleavage when the internal pressure becomes a certain value or more. The gas discharge valve is provided on the lid together with the external terminal (Patent Documents 1 and 2). Therefore, when the gas discharge valve is operated, there is a possibility that the gas discharged from the gas discharge valve or the electrolyte discharged along with the discharge of the gas adheres to the external terminal or the periphery thereof. When the gas or the electrolytic solution adheres, an unfavorable situation such as corrosion due to a potential difference occurs.

JP 2010-244898 A JP 2011-192547 A

  Accordingly, in view of such circumstances, the present invention provides a power storage element that can suitably prevent the gas or electrolyte discharged from the gas discharge valve from adhering to the external terminal or the periphery thereof when the gas discharge valve is operated. It is an object to provide a power storage device.

The electricity storage device according to the present invention is:
An electrode body including a positive electrode plate and a negative electrode plate which are insulated from each other, and having a laminated structure in which the positive electrode plate and the negative electrode plate are laminated in multiple layers
A case for housing the electrode body, a cylindrical case body having a pair of opening edges at both ends, a first lid for closing an opening formed by one opening edge, and the other opening edge A case provided with a second lid for closing the opening formed by the portion and insulated from the electrode body;
A gas discharge valve formed only on the first lid,
A positive external terminal disposed on the outer surface of the second lid and electrically connected to the positive electrode plate and a negative external terminal electrically connected to the negative electrode plate;
The electrode body includes, as a lead portion, a protruding portion in which at least one of the positive electrode plate and the negative electrode plate protrudes in a stacked state,
The first lid is a plate material whose outer peripheral portion is fitted to the inner peripheral surface of the opening edge and is convex in the case body,
The gas discharge valve is formed at a location facing the lead portion in the convex portion in the case body of the first lid.

According to this configuration, the gas discharge valve is formed in a region farthest from both the positive external terminal and the negative external terminal. Therefore, when the gas discharge valve is operated, it is possible to prevent the gas discharged from the gas or the electrolyte from adhering to the external terminal or the periphery thereof.
Moreover, according to this structure, the gas exhaust valve is located in the position offset in the case main body rather than the edge of the opening edge part of a case main body among cover bodies. That is, the gas discharge valve is in a state surrounded by the outer periphery of the lid and the opening edge of the case body. Therefore, when the gas discharge valve is operated, it is possible to restrict the diffusion of the gas and the electrolytic solution by the outer peripheral portion of the lid body and the opening edge portion of the case body.

Here, as one aspect of the electricity storage device according to the present invention,
Gas discharge valve may be so formed on the outer surface of the first lid.

  According to this configuration, the positive electrode external terminal and the negative electrode external terminal are disposed on one outer surface of the pair of opposed outer surfaces, and the gas exhaust valve is formed on the other outer surface of the pair of opposed outer surfaces. . For this reason, the gas discharge valve is formed in the region of the outer surface farthest from the outer surface on which the positive electrode external terminal and the negative electrode external terminal are arranged. Therefore, when the gas discharge valve is operated, it is possible to prevent the gas discharged from the gas or the electrolyte from adhering to the external terminal or the periphery thereof.

in this case,
The electrode body has a laminated structure in which a positive electrode plate and a negative electrode plate are wound, and has a flat shape including a pair of opposed flat portions and a pair of folded portions that connect ends of the pair of flat portions. Yes, at least one of the positive electrode plate and the negative electrode plate has a protruding portion protruding in a winding shape in a direction along the winding center of the electrode body from a side end of the other electrode plate. As
The gas discharge valve can be formed at a location facing the folded portion of the lead portion.

  According to this configuration, the gas discharge valve is provided in the vicinity of the lead portion. The gas is generated in the electrode body and escapes from the lead portion which is an open end. Therefore, if the gas discharge valve is provided in the vicinity of the lead portion, the discharge path in the case is shortened, and gas discharge is facilitated.

Moreover,
The lead portion includes a positive electrode lead portion at one end of the electrode body and a negative electrode lead portion at the other end of the electrode body,
The gas exhaust valve can include a first gas exhaust valve formed at a location facing the positive electrode lead portion and a second gas exhaust valve formed at a location facing the negative electrode lead portion. .

  According to such a configuration, the gas generated in the electrode body can be quickly discharged from the two gas discharge valves via the two leads.

The power storage device according to the present invention includes:
A plurality of power storage elements arranged in a first direction so that a gap is formed between adjacent power storage elements, each including a positive electrode plate and a negative electrode plate insulated from each other; Is an electrode body having a laminated structure in which multiple layers are laminated, a case for housing the electrode body, a cylindrical case body having a pair of opening edges at both ends, and an opening formed by one opening edge A first lid that closes the opening, and a second lid that closes the opening formed by the other opening edge, and is formed only in the case that is insulated from the electrode body and the first lid A plurality of power storage elements having a gas discharge valve and an external terminal disposed on the outer surface of the second lid in a second direction orthogonal to the first direction;
A shielding member that is arranged between adjacent power storage elements and spatially partitions the external terminal and the gas discharge valve;
In each of the plurality of power storage elements, the electrode body includes a protruding portion in which at least one of the positive electrode plate and the negative electrode plate protrudes in a stacked state as a lead portion, and the first lid body has an outer periphery Is a plate member that fits into the inner peripheral surface of the opening edge and is convex in the case body, and the gas discharge valve is a lead portion in a portion of the first lid that is convex in the case body It is formed in the location facing .

  According to such a configuration, the gas discharge valve is formed in a region farthest from the external terminal. Therefore, when the gas discharge valve is operated, it is possible to prevent the gas discharged from the gas or the electrolyte from adhering to the external terminal or the periphery thereof. And the effect can be heightened further by providing the shielding member which partitions off an external terminal and a gas exhaust valve spatially.

Here, as one aspect of the power storage device according to the present invention,
The shielding member can spatially partition the gap and the gas discharge valve.

  According to such a configuration, for example, when a so-called air-cooling method is employed in which the storage element is cooled by circulating a refrigerant such as air through a gap between the storage elements, the gas discharge valve is discharged from the gas discharge valve when it operates. It is possible to effectively suppress the gas from mixing with the refrigerant and the gas from being diffused by the refrigerant.

  As described above, according to the present invention, since the gas discharge valve is formed in a region farthest from the external terminal, when the gas discharge valve is operated, the gas and electrolyte discharged from the external terminal or Adhering to the periphery can be suitably prevented.

FIG. 1 is an exploded perspective view of a battery according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a state in which the in-case configuration of the battery is combined. FIG. 3 is a perspective view of the battery. FIG. 4 is a cross-sectional view in the longitudinal direction of the battery. FIG. 5 is a cross-sectional view of the battery in the short direction. FIG. 6A is a conceptual diagram showing a state in which the lid member is fitted into the opening edge of the case body and the periphery of the lid member and the edge of the opening edge are combined, and FIG. FIG. 6C is a conceptual diagram showing a state where the peripheral edge and the edge of the opening edge are laser-welded. FIG. 6C is an illustration of the case body and the cover member being integrated by welding the peripheral edge of the cover member and the edge of the opening edge. It is a conceptual diagram of the state made. FIG. 7A is a cross-sectional view in the alignment direction of the battery module in which a plurality of the batteries are aligned and integrated, and FIG. 7B is an enlarged view of the round part of FIG. 7A. FIG. 8 is a conceptual diagram showing a state in which the electrolyte is accumulated at the bottom of the battery. FIG. 9 is an exploded perspective view of a battery according to another embodiment. FIG. 10 is an exploded perspective view showing a state in which the in-case configuration of the battery is combined. FIG. 11 is a perspective view of the battery. FIG. 12 is a cross-sectional view in the longitudinal direction of the battery. FIG. 13 is a cross-sectional view of the battery in the short direction. FIG. 14 is a cross-sectional view in the alignment direction of a battery module in which a plurality of the batteries are aligned and integrated. FIG. 15 is an exploded perspective view of a battery according to another embodiment. FIG. 16 is a cross-sectional view of the battery in the short direction. FIG. 17A is a cross-sectional view in the alignment direction of the battery module in which a plurality of the batteries are aligned and integrated, and FIG. 17B is an enlarged view of the round part of FIG. FIG. 18 is a cross-sectional view in the longitudinal direction of a battery according to yet another embodiment. FIG. 19 is a cross-sectional view of the battery in the short direction. FIG. 20 is a cross-sectional view in the alignment direction of a battery module in which a plurality of the batteries are aligned and integrated. FIG. 21 is a cross-sectional view in the longitudinal direction of a battery according to yet another embodiment.

  Hereinafter, a battery which is an embodiment of a power storage device according to the present invention and a battery module in which a plurality of such batteries are aligned and integrated will be described with reference to the accompanying drawings. In the present embodiment, a lithium ion secondary battery (hereinafter simply referred to as “battery”) will be described as an example of the battery.

  As shown in FIGS. 1 to 3, the battery Ps according to this embodiment includes an electrode body (power generation element) including an electrically insulating separator 12, a positive electrode plate 13 and a negative electrode plate 15 sandwiching the separator 12 therebetween. 1, a pair of current collectors 2 each electrically connected to a corresponding polar plate of the positive electrode plate 13 and the negative electrode plate 15 of the electrode body 1, and the electrode body 1 and the pair of current collectors 2 The inner surface of the case 3 so as to correspond to the arrangement of the corresponding external terminals 6 of the pair of external terminals 6, respectively. And a pair of external gaskets 8 arranged along the outer surface of the case 3 so as to correspond to the arrangement of the corresponding external terminals 6 of the pair of external terminals 6. And.

  The positive electrode plate 13, the negative electrode plate 15, and the separator 12 are formed in a strip shape. The positive electrode plate 13, the negative electrode plate 15, and the separator 12 are overlapped in a state where the longitudinal directions coincide with each other, and are wound in the longitudinal direction. The positive electrode plate 13, the negative electrode plate 15, and the separator 12 are wound in a flat shape. Therefore, the shape of the electrode body 1 viewed from the first direction (X direction in the drawing) has a short axis in the second direction (Y direction in the drawing) orthogonal to the X direction, and the X direction and the Y direction. It has a major axis in a third direction (Z direction in the figure) perpendicular to it. That is, the electrode body 1 includes a pair of flat portions 10 that face each other in the Y direction, and a pair of folded portions (arc portions) 11 that connect the ends of the pair of flat portions 10.

  Moreover, the positive electrode plate 13 and the negative electrode plate 15 are overlapped with each other while being relatively displaced in the X direction, and are wound in the longitudinal direction. Therefore, a positive electrode lead portion 14 in which only the positive electrode plate 13 is laminated is formed at one end portion of the electrode body 1 in the X direction, and only a negative electrode plate 15 is laminated at the other end portion of the electrode body 1 in the X direction. A negative electrode lead portion 16 is formed.

  Here, the positive electrode plate 13 was coated with a positive electrode active material paint on one surface of a positive electrode current collector base material made of a strip-shaped aluminum foil, dried, and then on the opposite surface of the positive electrode current collector base material. A positive electrode active material layer (positive electrode active material coating portion) is provided on both surfaces of the positive electrode current collector base material by applying a paint and drying. More specifically, the positive electrode plate 13 is formed by applying a positive electrode active material paint on both surfaces of the positive electrode current collecting base material except for one end part in the width direction of the positive electrode current collecting base material. A positive electrode active material layer is provided on both surfaces. Therefore, the one end portion is a portion where the positive electrode current collecting base material is exposed (a portion where the positive electrode active material layer is not formed). The positive electrode lead portion 14 is constituted by the positive electrode active material layer non-forming portion.

  In addition, the negative electrode plate 15 is coated with a negative electrode active material paint on one surface of a negative electrode current collector substrate made of a strip-shaped copper foil, dried, and then similarly applied to the opposite surface of the negative electrode current collector substrate. The negative electrode active material layer (negative electrode active material coating part) is provided on both surfaces of the negative electrode current collecting base material. More specifically, the negative electrode plate 15 is formed by applying a negative electrode active material paint on both surfaces except for one end in the width direction of the negative electrode current collecting base material, and so on. A negative electrode active material layer is provided on both surfaces. Therefore, the one end portion is a portion where the negative electrode current collecting base material is exposed (negative electrode active material layer non-forming portion). The negative electrode lead part 16 is constituted by this positive electrode active material layer non-formation part.

  The positive electrode lead portion 14 is bundled by the clip member 18, and the negative electrode lead portion 16 is also bundled by the clip portion 18.

  The current collector 2 is formed by bending a metal plate. The current collector 2 includes a first connection portion 20 disposed along the Z direction and a second connection portion 24 extending from the first connection portion 20.

  The first connection part 20 includes a connection piece 21 extending in the X direction. The connection piece 21 can be inserted into the winding center of the end portion of the electrode body 1 in the X direction. The connection piece 21 is welded to the clip member 18. Thereby, the positive electrode current collector 2 and the positive electrode plate 13 (the positive electrode lead portion 14) of the electrode body 1 are electrically connected, and the negative electrode current collector 2 and the negative electrode plate 15 (of the electrode body 1) The negative electrode lead portion 16) is electrically connected.

  The second connection portion 24 is fixed to the case 3 and is electrically connected to the corresponding external terminal 6 of the pair of external terminals 6. The second connection portion 24 is flat and is formed so as to be longitudinal in the X direction. The second connection portion 24 includes a through hole 25 for inserting the external terminal 6.

  Differences between the positive electrode current collector 2 and the negative electrode current collector 2 will be described. In general, from an electrochemical viewpoint, the current collector 2 for the positive electrode is made of aluminum or an aluminum alloy, and the current collector 2 for the negative electrode is made of copper or a copper alloy. Accordingly, from the viewpoint of mechanical strength, the thickness of the positive electrode current collector 2 is set to be greater than the thickness of the negative electrode current collector 2.

  The case 3 includes a cylindrical case main body 30 having both ends opened, a first lid 40 that closes one opening of the case main body 30, and a second lid 50 that closes an opening on the opposite side of the case main body 30. I have.

  The case body 30 is formed in a rectangular tube shape. Therefore, the case main body 30 is a pair of first wall portions 31 each having a first end portion P1 and a second end portion P2 opposite to the first end portion P1, and is spaced apart in the X direction. A pair of first wall portions 31 facing each other and a pair of second wall portions 32 each having a first end portion P3 and a second end portion P4 opposite to the first end portion P3, A pair of second wall portions 32 facing each other with a gap in the Y direction between the first wall portions 31 is provided. Accordingly, the first end portion P1 of the pair of first wall portions 31 and the first end portion P3 of the pair of second wall portions 32 (the first opening edge portion 33 of the case main body 30) surround the first region P1. One opening 34 is formed, and the second end P2 of the pair of first walls 31 and the second end P4 of the pair of second walls 32 (the second opening edge 35 of the case body 30) surround the first opening 34. A second opening 36 is formed in the region.

  In the present embodiment, the case main body 30 is formed in a rectangular tube shape with a rectangular cross-section in which the X direction is the longitudinal direction and the Y direction is the short direction. Therefore, the 1st wall part 31 is a rectangular shape which makes a longitudinal direction in a Z direction, and the 2nd wall part 32 is a rectangular shape which makes a longitudinal direction in a X direction, and the 1st opening edge part 33 and the 2nd opening edge part Each of 35 has a rectangular shape which is long in the X direction. However, the connection part of the 1st wall part 31 and the 2nd wall part 32 is formed in circular arc surface shape. Therefore, the corner of the case body 30 is rounded with a small radius of curvature, and each of the first opening edge 33 and the second opening edge 35 has a rectangular shape with rounded corners.

  The case body 30 can be formed by, for example, extrusion processing. By forming by extruding, the thickness of the case body 30 can be easily made thinner than the thickness of the conventional case body formed by deep drawing. Moreover, since the case main body 30 can be obtained only by cutting the extruded board | plate material, productivity can be improved.

  The first lid 40 closes the first opening 34 and becomes the bottom of the case 3 when the case 3 is arranged so that the first lid 40 is on the lower side. The second lid 50 closes the second opening 36 and becomes the top of the case 3 when the case 3 is arranged so that the first lid 40 is on the lower side. The case body 30, the first lid body 40, and the second lid body 50 are all made of metal (for example, aluminum or aluminum alloy). By welding the first lid body 40 and the second lid body 50 to the case body 30, the internal space of the case 3 is formed airtight.

  As shown in FIGS. 4 and 5, the first lid body 40 includes a base portion 41 and an outer peripheral portion 42 that surrounds the base portion 41. The base portion 41 is flat, and the outer peripheral portion 42 stands from the periphery of the base portion 41. More specifically, the base 41 is rectangular or substantially rectangular corresponding to the first opening edge 33 being rectangular or substantially rectangular, but smaller than the shape of the first opening edge 33. And it is located in the position offset in the case main body 30 rather than the edge of the 1st opening edge part 33. FIG. The peripheral edge of the outer peripheral portion 42 erected from the peripheral edge of the base portion 41 has a rectangular shape or a substantially rectangular shape corresponding to the shape of the first opening edge portion 33. More specifically, the peripheral edge of the outer peripheral portion 42 has a shape that matches the inner peripheral surface of the first opening edge portion 33, that is, a shape that fits to the inner peripheral surface of the first opening edge portion 33.

  The standing height (the height in the Z direction) of the outer peripheral portion 42 is uniform over the entire circumference. Therefore, the peripheral edge of the outer peripheral portion 42 is parallel to the flat surface of the base portion 41. And in the state which the 1st cover body 40 was inserted in the 1st opening edge part 33, as shown to Fig.6 (a), the periphery (periphery of the 1st cover body 40) of the outer peripheral part 42 is 1st. Aligned with the edge of the opening edge 33. At this time, as described above, the peripheral edge of the outer peripheral portion 42 has a shape that coincides with the inner peripheral surface of the first opening edge portion 33, so that the peripheral edge of the first lid body 40 and the edge of the first opening edge portion 33 Adheres over the entire circumference. Therefore, even if the case main body 30 is deformed inward before the first lid 40 is inserted into the first opening edge portion 33, the case main body 30 is subjected to the force f from the first lid 40. To correct the shape.

  The outer peripheral part 42 is formed in the circular arc surface shape. More specifically, the outer peripheral portion 42 is curved until it is orthogonal to or substantially orthogonal to the base portion 41. Therefore, the peripheral edge of the first lid 40 is in surface contact with the inner peripheral surface of the first opening edge 33 within a predetermined range. As shown in FIG. 6B, the laser beam for laser welding is irradiated toward the joint portion between the peripheral edge of the first lid 40 and the edge of the first opening edge 33. The laser beam may be irradiated from the front direction (direction of reference symbol R1) to the mating portion between the peripheral edge of the first lid 40 and the edge of the first opening edge portion 33, or oblique to the mating portion. Irradiation may be performed from the direction (direction of reference R2), or irradiation may be performed from the lateral direction (direction of reference R3) with respect to the mating portion. However, since there is no gap at the joining portion between the peripheral edge of the first lid 40 and the edge of the first opening edge 33, even if the laser beam is irradiated from the R1 direction, the laser beam falls out into the case 3. The laser beam can be reliably irradiated to the mating portion between the peripheral edge of the first lid 40 and the end edge of the first opening edge 33, and a good welded state can be obtained. In this respect, the direction of laser light irradiation is more preferably the R1 direction.

  The first lid 40 has a high rigidity due to an increased cross-sectional moment due to the outer peripheral portion 42 erected from the base portion 41. For this reason, after welding (symbol m in FIG. 6C), even if an external force F is applied to the case 3 on the first opening edge 33 side, the case 3 is hardly deformed. As described above, the first lid body 40 is convex in the case main body 30, more specifically in a convex shape, and greatly contributes to the shape stability (standardity) of the case 3.

  The first lid 40 is obtained by pressing or drawing a flat plate material. The wall thickness of the first lid 40 may be the same as the wall thickness of the case body 30, or may be thinner than the wall thickness of the case body 30 or vice versa. The thickness of the first lid 40 can be selected depending on the rigidity that the first lid 40 should develop.

  Here, as shown in FIGS. 1 to 5, the first lid 40 has a gas discharge valve 45 for releasing the internal pressure of the case 3 by cleaving when the internal pressure of the case 3 becomes a certain value or more. It has. As an example, the gas discharge valve 45 has a configuration in which a part of the first lid 40 is thinned to such an extent that it can be cleaved by the increased internal pressure of the case 3 (and further, a half-cut line is formed).

  In the present embodiment, the first lid body 40 includes a pair of gas discharge valves 45 arranged at intervals in the X direction. One gas discharge valve 45 is formed at one end of the base 41 of the first lid 40, and the other gas discharge valve 45 is formed at the other end of the base 41. Therefore, when the case 3 is arranged so that the first lid 40 is on the lower side, one gas discharge valve 45 is located at one end in the X direction of the bottom of the case 3 and the other gas discharge valve 45 is located at the other end of the bottom of the case 3 in the X direction. One gas discharge valve 45 faces the positive electrode lead portion 14 (the folded portion 11) of the electrode body 1, and the other gas discharge valve 45 faces the negative electrode lead portion 16 (the folded portion 11). Yes.

  The second lid 50 basically has the same configuration as the first lid 40. That is, the second lid body 50 includes a base portion 53 and an outer peripheral portion 54 that surrounds the base portion 53. The base 53 is flat, and the outer peripheral part 54 stands up from the periphery of the base 53. More specifically, the base 53 is rectangular or substantially rectangular corresponding to the second opening edge 35 being rectangular or substantially rectangular, but is smaller than the shape of the second opening edge 35. And it is located in the position offset in the case main body 30 rather than the edge of the 2nd opening edge part 35. As shown in FIG. The peripheral edge of the outer peripheral portion 54 erected from the peripheral edge of the base 53 has a rectangular shape or a substantially rectangular shape corresponding to the shape of the second opening edge portion 35. More specifically, the peripheral edge of the outer peripheral portion 54 has a shape that matches the inner peripheral surface of the second opening edge portion 35, that is, a shape that fits to the inner peripheral surface of the second opening edge portion 35.

  The standing height (the height in the Z direction) of the outer peripheral portion 54 is uniform over the entire circumference. Therefore, the peripheral edge of the outer peripheral portion 54 is parallel to the flat surface of the base portion 53. In the state where the second lid 50 is fitted in the second opening edge 35, the periphery of the outer peripheral portion 54 (the periphery of the second lid 50) is aligned with the edge of the second opening edge 35. . At this time, as described above, the peripheral edge of the outer peripheral portion 54 has a shape that coincides with the inner peripheral surface of the second opening edge 35, and therefore, the peripheral edge of the second lid 50 and the edge of the second opening edge 35 Adheres over the entire circumference. Therefore, even if the case main body 30 is deformed inward before the second lid 50 is fitted into the second opening edge 35, the case main body 30 does not receive the force from the second lid 50. It is received and corrected to an appropriate shape.

  The outer peripheral part 54 is formed in the circular arc surface shape. More specifically, the outer peripheral portion 54 is curved until it is orthogonal to or substantially orthogonal to the base portion 53. Therefore, the peripheral edge of the second lid 50 is in surface contact with the inner peripheral surface of the second opening edge 35 within a predetermined range. The laser beam for laser welding is irradiated toward the joint between the peripheral edge of the second lid 50 and the edge of the second opening edge 35. The laser beam may be irradiated from the front direction to the mating portion between the peripheral edge of the second lid 50 and the end edge of the second opening edge 35, or may be irradiated from an oblique direction to the mating portion. Alternatively, irradiation may be performed from the lateral direction with respect to the mating portion. However, since there is no gap at the joint between the peripheral edge of the second lid 50 and the edge of the second opening edge 35, even if the laser beam is irradiated from the front direction, the laser beam is released into the case 3. The laser beam can be reliably irradiated to the mating portion between the peripheral edge of the second lid 50 and the edge of the second opening edge 35, and a good welded state can be obtained. In this respect, it is more preferable that the irradiation direction of the laser light is the front direction.

  The second lid 50 has a high rigidity due to a large sectional moment due to the outer peripheral portion 54 erected from the base 53. Therefore, even if an external force is applied to the case 3 on the second opening edge 35 side after welding, the case 3 is difficult to deform. As described above, the second lid body 50 is convex in the case main body 30, more specifically in a convex shape, and greatly contributes to the shape stability (standardity) of the case 3.

  The second lid 50 is obtained by pressing or drawing a flat plate material. The wall thickness of the second lid 50 may be the same as the wall thickness of the case body 30, or may be thinner than the wall thickness of the case body 30, or vice versa. The thickness of the second lid 50 can be selected depending on the rigidity that the second lid 50 should develop.

  The second lid body 50 is provided with a pair of through holes 51 arranged with a gap in the X direction. One through hole 51 is formed at one end of the second lid 50 in the X direction, and the other through hole 51 is formed at the other end of the second lid 50 in the X direction.

  The external terminal 6 includes a body portion 60 and a caulking portion 63 protruding from the body portion 60. The body 60 has a flat surface 61, and a bus bar (not shown) is placed on the flat surface 61 and connected by welding. That is, the external terminal 6 is a welding type external terminal. The body portion 60 is formed narrower than the width of the second lid body 50 (the width in the Y direction). The trunk | drum 60 is a rectangular parallelepiped shape long in a X direction. The caulking portion 63 is configured so that at least the tip side can be plastically deformed (caulking process). The caulking portion 63 protrudes from the center of the surface of the body portion 60 facing the second lid body 50.

  The internal gasket 7 is a synthetic resin molded product having electrical insulation and sealing properties. The internal gasket 7 is set to a size that can face the entire second connection portion 24 of the current collector 2. The internal gasket 7 includes a through hole 70 that matches the through hole 25 of the second connection portion 24.

  The outer gasket 8 is a synthetic resin molded product having electrical insulation and sealing properties, like the inner gasket 7. The external gasket 8 includes a recess 80 that receives the body 60 of the external terminal 6. The external gasket 8 includes a through hole 81 through which the caulking portion 63 of the external terminal 6 can be inserted in a state where the body portion 60 of the external terminal 6 is accommodated in the recess 80.

  The standing height (the height in the Z direction) from the base 53 of the outer peripheral portion 54 of the second lid 50 may be the same as the standing height from the base 41 of the outer peripheral portion 42 of the first lid 40. Alternatively, it may be higher than the standing height from the base portion 41 of the outer peripheral portion 42 of the first lid 40, or conversely, it may be lower, but the external gasket 8 disposed on the base 53 of the second lid 50 and the first The outer wall portion of the outer gasket 8 is preferably formed at a height such that the upper end surface of the outer gasket 8 protrudes outward from the peripheral edge of the second lid 50 so that the creepage distance with the lid 40 is increased.

  The caulking portion 63 of the external terminal 6 is formed in the through hole 81 of the external gasket 8, the through hole 51 of the second lid 50, the through hole 70 of the internal gasket 7, and the through hole 25 of the second connection portion 24 of the current collector 2. It is inserted continuously. And the front-end | tip part which protruded inward from the 2nd connection part 24 of the electrical power collector 2 among the crimping parts 63 is crimped. As a result, the external terminal 6 is integrated with the second lid 50 while being insulated from the second lid 50 by the external gasket 8 and the internal gasket 7, and is electrically connected to the current collector 2. Connected.

  According to the battery Ps according to the present embodiment configured as described above, the case body 30 is formed by extrusion processing, and the case bodies 3 are manufactured by welding the lid bodies 40 and 50 to the opening edge portions 33 and 35 at both ends thereof. The Therefore, the case can be manufactured at a lower cost than the conventional case in which the case body is formed by deep drawing and a lid is welded to the opening edge of one end thereof, and the battery manufacturing cost can be reduced. Can be reduced. Further, since the degree of freedom of the shape that can be produced is higher than that of deep drawing, there is an advantage that the degree of freedom in designing the case 3 and thus the degree of freedom in designing the battery Ps are increased.

  Further, according to the battery Ps according to the present embodiment, the case main body 30 is formed by extrusion processing, so that the thickness of the case main body 30 can be reduced. As a result, the weight of the battery can be reduced compared to the conventional battery, and the thickness of the case body 30 can be reduced to reduce the volume of the portion that does not contribute to power generation (case 3). Efficiency (energy density) can be increased.

  Further, since the case main body 30 is thinned, the case main body 30 is less rigid and easily deformed. In addition to the second lid 50, the first lid 40 is the shape-retaining shape of the case main body 30. Since the shape stability of the case main body 30 is ensured as a means, a significant reduction in rigidity of the case 3 can be suppressed. The fact that the case body 30 is not deformed by the first lid 40 means that when the electrode body 1 is inserted from the second opening 36 of the case body 30, the electrode body 1 inadvertently hits the second opening edge 35. Not only is it prevented from being scratched, but a gap is created between the peripheral edge of the second lid 50 closing the second opening 36 and the edge of the second opening edge 35, and the second This means that when the lid 50 is welded to the second opening edge 35, a situation in which the laser beam passes inside and the electrode body 1 in the case 3 is damaged is prevented. That is, the first lid 40 ensures the shape stability of the case main body 30, thereby ensuring the flatness of the edge of the second opening edge 35, and thereby the first lid 40 and the peripheral edge of the second lid 50. It is possible to prevent a gap from being formed between the edge of the two opening edges 35.

  In addition, since the periphery of the first lid 40 has a shape that matches the inner peripheral surface of the first opening edge 33 of the case body 30, the first lid 40 is fitted into the first opening edge 33. The edge of the first opening edge 33 of the case body 30 is in close contact with the peripheral edge of the first lid 40. In addition, since the rigidity of the first lid body 40 is higher than that of the case main body 30, even if the case main body 30 is deformed prior to insertion, the first opening edge 33 is formed in the first lid body. The case main body 30 is corrected to an appropriate shape following the periphery of 40.

  Further, according to the battery Ps according to the present embodiment, the adhesion between the peripheral edge of the first lid body 40 and the edge of the first opening edge 33 of the case main body 30 and the peripheral edge of the second lid body 50 and the case main body 30. Since the adhesiveness with the edge of the second opening edge 35 is high, even if the laser beam is irradiated from the front (that is, in the Z direction) to the mating portion of both, the laser beam escapes into the case 3 The laser is not applied to the joining portion between the peripheral edge of the first lid 40 and the end edge of the first opening edge 33 and the joining portion between the peripheral edge of the second lid 50 and the edge of the second opening edge 35. Light can be reliably irradiated and a good welding state can be obtained. Note that if the laser beam is irradiated from an oblique direction (see symbol R2 in FIG. 6B), there is no need to worry about the laser beam dropping, but the tilt angle of the welding head that emits the laser beam is changed.・ Adjustment mechanism is required and welding equipment becomes large. Not only that, but also the mating part of the peripheral edge of the first lid 40 and the edge of the first opening edge 33 and the mating part of the peripheral edge of the second lid 50 and the edge of the second opening edge 35. The welding head moves around the XY plane and rotates around the Z axis to weld the entire circumference, but the machining program that controls the movement becomes complicated, and it takes time and money to create the machining program. There is a problem that it takes. If the laser beam is irradiated from the lateral direction (see reference numeral R <b> 3 in FIG. 6B), the problem of the laser beam omission disappears at all, but the peripheral edge of the first lid 40 and the edge of the first opening edge 33. There is a possibility that the laser beam cannot be appropriately irradiated to the mating portion and the mating portion of the peripheral edge of the second lid 50 and the end edge of the second opening edge portion 35. However, if it is a method of irradiating laser light in an oblique direction, the laser light hitting the object will not be reflected on the head, so it is preferable for welding equipment, and a method of irradiating laser light from the lateral direction If so, it is possible to appropriately weld by increasing the output. In short, it is possible to appropriately select the laser light irradiation direction depending on the situation.

  Further, according to the battery Ps according to the present embodiment, the outer peripheral portion 42 of the first lid body 40 is curved until it is orthogonal to or substantially orthogonal to the base portion 41, and the outer peripheral portion 54 of the second lid body 50 is orthogonal to the base portion 53. Curved until approximately orthogonal. Therefore, the peripheral edge of the first lid body 40 is in surface contact with the inner peripheral surface of the first opening edge portion 33 within a predetermined range, and the peripheral edge of the second lid body 50 is predetermined on the inner peripheral surface of the second opening edge portion 35. Surface contact in range. Thereby, the joint strength between the first opening edge 33 and the first lid 40 and the joint strength between the second opening edge 35 and the second lid 50 can be further increased.

  Further, according to the battery Ps according to the present embodiment, the gas discharge valve 45 is provided on the surface of the case 3 opposite to the surface on which the external terminal 6 is provided. That is, the gas discharge valve 45 is provided on the first lid 40 located on the opposite side of the second lid 50, while the external terminal 6 is provided on the second lid 50. Therefore, the external terminal 6 and the gas discharge valve 45 are in the opposite relationship in the case 3, and the gas discharge valve 45 is at a position farthest from the external terminal 6. Therefore, when the gas discharge valve 45 is activated, the gas discharged from the gas discharge valve 45 or the electrolyte discharged with the discharge of the gas is the external terminal 6 or the bus bar connected to the external terminal 6 or the external terminal 6. It is possible to prevent adhesion to power lines and signal lines connected to the bus bar.

  Even if the gas discharge valve is formed in the case body 30, that is, when the gas discharge valve is provided in the lateral region of the external terminal 6, the gas discharge valve is located away from the external terminal. Will be provided. However, when the case 3 is arranged so that the gas discharge valve is on the upper side, when the gas discharge valve is operated, the electrolyte discharged from the gas discharge valve is dripped down along the surface of the case main body 30, and the external terminal The possibility of adhering to or around 6 is undeniable. According to the battery Ps according to the present embodiment, the gas discharge valve 45 is located farthest from the external terminal 6, and there are two orthogonal positions from the gas discharge valve 45 to the external terminal 6. Therefore, the possibility that the electrolyte discharged from the gas discharge valve 45 drips and reaches the external terminal 6 is extremely low. As described above, according to the battery Ps according to the present embodiment, not only the gas discharge valve is provided at a location away from the external terminal 6, but a remarkable effect is exhibited.

  In addition, the gas discharge valve 45 is provided in the base 41 located at a position offset in the case body 30 from the end edge of the first opening edge 33 of the case body 30 in the first lid 40. That is, the gas discharge valve 45 is in a state surrounded by the outer peripheral portion 42 of the first lid body 40 and the first opening edge portion 33 of the case body 30. Therefore, when the gas discharge valve 45 is actuated, gas diffusion is regulated by the outer peripheral portion 42 of the first lid 40 and the first opening edge portion 33 of the case body 30.

  Further, the gas discharge valve 45 is positioned inside the case body 30 in the first lid body 40 from the edge of the first opening edge 33 of the case body 30, so that the gas discharge valve 45 is located inside the outer line of the case 3. positioned. Therefore, even if the battery Ps is arranged, the gas discharge valve 45 does not come into contact with the arrangement surface. As a result, it is possible to prevent the gas discharge valve 45 from being inadvertently weakened by receiving an external force and operating with a force smaller than the intended force.

  The gas discharge valve 45 is provided in the vicinity of the positive electrode lead portion 14 and the negative electrode lead portion 16. The gas is generated in the electrode body 1 and escapes from the positive electrode lead portion 14 and the negative electrode lead portion 16 which are open ends. Therefore, if the gas discharge valve 45 is provided in the vicinity of the positive electrode lead portion 14 and the negative electrode lead portion 16, the discharge path in the case 3 is shortened (shortest), and the gas discharge is facilitated.

  Next, a battery module in which the batteries Ps according to the present embodiment are aligned and integrated in one direction will be described with reference to FIG.

  The battery module M according to the present embodiment includes a plurality of batteries Ps aligned in the Y direction, a plurality of spacers 100 disposed between adjacent batteries Ps and on both sides of the plurality of batteries Ps in the Y direction, and a plurality of batteries Ps. A frame 110 as a holding body that holds and packages the battery Ps and the plurality of spacers 100 is provided.

  The spacer 100 is made of synthetic resin and has an insulating property. In the battery module according to the present embodiment, as a cooling method of the battery Ps, the battery Ps is cooled by the air flowing between the adjacent batteries Ps or between the adjacent batteries Ps and the termination member 111 (described later). Air-cooled type is adopted. Therefore, the spacer 100 has a form in which a gap is formed between the adjacent batteries Ps or between the adjacent batteries Ps and the termination member 111. In the present embodiment, the spacer 100 is employed in which a plurality of protrusions protrude from the front and back surfaces of the plate-like spacer main body at intervals, but the present invention is not limited to this. For example, among spacers of various structures, such as a spacer in which a plurality of protrusions protrude from one side of a plate-like spacer body with a space between each other, or a spacer whose cross-sectional shape is a rectangular wave shape It can be appropriately selected.

  Adjacent batteries Ps or adjacent batteries Ps and termination members 111 are connected by a fixing member 105. The fixing member 105 is applied to one end side and the other end side in the Z direction of the battery Ps. The fixing member 105 is formed long along the X direction. The fixing member 105 is formed to have a length slightly shorter than between the pair of first wall portions 31 of the case 3 of the battery Ps. More specifically, the fixing member 105 is formed to have the same or substantially the same length as the length in the X direction of the second wall portion 32 excluding the rounded corner portion of the case body 30. As described above, the corner portion of the case body 30 is rounded with a small radius of curvature, and the arc portion is negligible. Therefore, the fixing member 105 is substantially formed of the second wall portion 32. It can be said that it is the same as the length in the X direction.

  The fixing member 105 includes a pair of groove portions 106 arranged at intervals in the Y direction, and a convex portion 107 positioned between the pair of groove portions 106. The groove portion 106 is formed along the longitudinal direction of the fixing member 105, that is, along the X direction. The groove 106 is formed from one end to the other end in the longitudinal direction of the fixing member 105. The convex portion 107 is also formed in the same manner as the groove portion 106.

  The groove portion 106 is a joint portion between the peripheral edge of the first lid 40 of the battery Ps and the edge of the first opening edge 33, the peripheral edge of the second lid 50 of the battery Ps, and the edge of the second opening edge 35. Or a protrusion 112 formed along the X direction at the end of the terminal member 111 in the Z direction.

  The convex portion 107 of the fixing member 105 has a width that is the same as or slightly smaller than the width of the spacer 100 in the Y direction, and is inserted between adjacent batteries Ps or between adjacent batteries Ps and a termination member 111. It is an insertion part.

  Therefore, the adjacent battery Ps includes one of the fixing members 105 in which the joint portion between the peripheral edge of the first lid 40 and the edge of the first opening edge 33 of the one battery Ps is disposed on the first lid 40 side. Case 3 in which the mating portion of the peripheral edge of the first lid 40 of the other battery Ps and the edge of the first opening edge portion 33 fits in the other groove portion 106 and the convex portion 107 is adjacent to the other battery Ps. Are connected by being inserted between the end portions on the first lid 40 side. In addition, the adjacent battery Ps includes one of the fixing members 105 in which a joint portion between the peripheral edge of the second lid 50 and the edge of the second opening edge 35 of the one battery Ps is disposed on the second lid 50 side. Case 3 in which the mating part of the peripheral edge of the second lid 50 of the other battery Ps and the end edge of the second opening edge 35 fits into the other groove part 106 and the convex part 107 is adjacent to the other battery Ps. It is connected by being inserted between the end parts on the second lid 50 side.

  The adjacent battery Ps and the termination member 111 are one of the fixing members 105 in which the joint portion between the peripheral edge of the first lid 40 and the edge of the first opening edge 33 of the battery Ps is disposed on the first lid 40 side. The projection 112 on one end side in the Z direction of the end member 111 is fitted on the other groove 106, and the projection 107 is the end on the first lid 40 side of the case 3 and the end member 111. Are connected by being inserted between one end portions in the Z direction. Moreover, the adjacent battery Ps and the termination | terminus member 111 are the fixing member 105 by which the joint part of the periphery of the 2nd cover body 50 of the battery Ps and the edge of the 2nd opening edge part 35 was arrange | positioned at the 2nd cover body 50 side. Of the end member 111 in the Z direction, the convex portion 112 on the other end side in the Z direction fits into the other groove portion 106, and the convex portion 107 further includes the end portion on the second lid 50 side of the case 3 and The terminal member 111 is connected by being inserted between the other end portions in the Z direction.

  The frame 110 is disposed on both sides of the plurality of batteries Ps in the Y direction, and a pair of termination members 111 (so-called end plates) sandwiching the plurality of batteries Ps and the plurality of spacers 100 in the Y direction, and the pair of termination members 111 And a connecting member 113 for integrally fastening the plurality of batteries Ps and the plurality of spacers 100 together. That is, the battery module M according to the present embodiment is a so-called stack type battery module M in which a plurality of batteries Ps are stacked in one direction.

  The termination member 111 is made of metal such as aluminum formed by casting, for example. The termination member 111 is formed in a rectangular shape corresponding to the case 3 of the battery Ps having a rectangular shape as viewed from the Y direction, like the spacer 100. The termination member 111 is composed of a rectangular frame portion and lattice-shaped ribs formed in the frame portion, and has a certain thickness in the X direction, but is lightweight and rigid. . However, in addition to this termination member, it can be appropriately selected from termination members having various structures such as a press-molded plate-like termination member.

  The connecting member 113 is fixed to the end member 111 by a fastener such as a bolt. The connecting member 113 connects the corner portions of the pair of terminal members 111. Therefore, four connection members 113 are arranged corresponding to the four corners of the termination member 111. Although not shown, the connecting member 113 is in direct or indirect contact with each fixing member 105 from the Z direction. The fixing member 105 is prevented from being detached from the battery Ps and the terminal member 111 by the connecting member 113.

  The frame 110 further includes a shield 114 that covers the entire surface of the plurality of batteries Ps on the first lid 40 side with a certain distance therebetween. The shield 114 is formed in a plate shape, an end in the Y direction is fixed to one end in the Z direction of the termination member 111, and a pair of side ends in the X direction are disposed on the first lid 40 side. The connecting member 113 is directly or indirectly supported.

  According to the battery module M according to the present embodiment having the above-described configuration, the batteries Ps can be combined by combining the special end structure of the case 3 of the battery Ps and the fixing member 105 having a shape suitable for the end structure. In addition, the battery Ps and the termination member 111 can be securely fixed.

  Further, according to the battery module M according to the present embodiment, the gap between the adjacent batteries Ps and the gap between the adjacent batteries Ps and the termination member 111, that is, the cooling flow path is a fixing member arranged on both sides thereof. It is sealed with 105. Therefore, the refrigerant can flow without leakage along the X direction, and the cooling efficiency can be improved.

  The fixing member 105 arranged on the second lid 50 side is also the same, but in particular, the fixing member 105 arranged on the first lid 40 side is a shielding member that partitions the external terminal 6 and the gas discharge valve 45. Is functioning as Thereby, when the gas discharge valve 45 operates, it can prevent more effectively that the gas and electrolyte solution which are discharged | emitted from there adhere to the external terminal 6 or its periphery.

  And according to battery module M concerning this embodiment, one space part is formed between the 1st lid 40 side of a plurality of batteries Ps, and shield 114, and this is the gas at the time of gas exhaust valve 45 operation. Although it is a discharge path, the gas discharge path and the cooling flow path are partitioned by a fixing member 105 disposed on the first lid 40 side. Therefore, it is possible to effectively suppress the gas discharged from the gas discharge valve 45 when the gas discharge valve 45 is operated from being mixed with the refrigerant and the gas being diffused by the refrigerant.

  In addition, according to the battery module M according to the present embodiment, the first lid 40 that is the bottom of the case 3 is convex in the case main body 30, and more specifically, has a convex shape. Therefore, as shown in FIG. 8, the bottom portion of the case 3 has a shape in which the central portion is raised and the outer peripheral portion is recessed. And electrolyte solution is stored by this hollow outer peripheral part. Thereby, when the amount of the electrolytic solution stored in the case 3 is small, the gas discharge valve 45 is always located above the liquid surface of the electrolytic solution and is not exposed to the electrolytic solution. Therefore, when the gas discharge valve 45 is operated, it is possible to eliminate or preferably suppress the situation where the electrolyte is discharged together with the gas discharge. Further, even when the amount of the electrolyte stored in the case 3 is large and the gas discharge valve 45 is exposed to the electrolyte, when the gas discharge valve 45 operates, It is possible to reduce the amount of the electrolyte discharged to the portion corresponding to the recessed outer peripheral portion.

  In addition, this invention is not limited to the said embodiment, Of course, it can change suitably in the range which does not deviate from the summary of this invention.

  For example, in the said embodiment, the 1st cover body 40 and the 2nd cover body 50 have the same structure, ie, the cover body which becomes convex in the case main body 30 is used. Thereby, each effect mentioned above can be enjoyed also in the 2nd cover body 50 side. In particular, the second lid 50 is welded to the second opening edge 35 of the case main body 30 in a state where the electrode body 1 is inserted into the case main body 3, so that the laser light is pulled out into the case 3. There is an effect peculiar to the second lid 50 in that the electrode body 1 can be prevented from being damaged. However, the present invention is not limited to this. For example, as shown in FIGS. 9 to 14, the second lid 50 may be a flat plate material as in the conventional lid. The peripheral edge of the second lid 50 is thinned by, for example, pressing or coining. The second lid 50 closes the second opening 36 such that the thin wall portion comes into contact with the edge of the second opening edge 35 of the case body 30.

  In this case, another fixing member 108 may be applied to the ends of the adjacent batteries Ps on the side opposite to the fixing member 105, or to the ends of the adjacent batteries Ps and the termination member 111. . The fixing member 108 is formed in a long shape along the X direction. More specifically, the fixing member 108 is formed to have the same length as the fixing member 105 or the same length as the length of the second lid body 50 in the X direction. The fixing member 108 is in a state in which the connecting member 113 is in contact with each fixing member 108 directly or indirectly from the Z direction so as to stride over the ends of the adjacent batteries Ps or adjacent batteries Ps. And it hold | maintains in the state contact | abutted ranging over the edge parts of the termination | terminus member 111. FIG.

  Note that the fixing member 108 is merely in contact with the second lid 50. Therefore, when functioning as a shielding member that partitions the external terminal 6 and the gas discharge valve 45, a sealing member (seal member) such as packing or a flexible rib is provided between the second lid 50 and the fixing member 108. Preferably it is arranged. The flexible rib is preferably formed integrally with the fixing member 108.

  Moreover, even if the lid structure in which the outer peripheral portion stands is employed only in the opening edge portion on one side of the case body 30, it is not the first opening edge portion 33 that becomes the bottom portion side of the case 3 as in the above embodiment. The second opening edge 35 on the side where the external terminal structure is provided may be employed.

  Moreover, in the said embodiment, after the 1st cover body 40 is first inserted and welded in the 1st opening edge part 33 of the case main body 30, and the bottomed case main body 30 is produced, The electrode body 1 is inserted into the case main body 30 from the second opening 36, and the second lid 50 is welded to the second opening edge 35. However, the present invention is not limited to this. After the electrode body 1 is inserted into the case body 30, the first lid body 40 and the second lid body 50 are welded to the first opening edge portion 33 and the second opening edge portion 35 of the case body 30. Also good.

  In the above-described embodiment, the outer periphery 42 of the first lid 40 is curved until it is orthogonal to or substantially orthogonal to the base 41, so that the periphery of the first lid 40 becomes the inner peripheral surface of the first opening edge 33. Surface contact is made within a predetermined range. However, the present invention is not limited to this. For example, the outer periphery 42 of the first lid 40 is not curved until it is orthogonal or substantially orthogonal to the base 41, so that the periphery of the first lid 40 intersects the inner peripheral surface of the first opening edge 33. You may make it contact. The same applies to the second lid 50 when the second lid 50 has the same structure as the first lid 40.

  Moreover, in the said embodiment, the 1st cover body 40 is the structure provided with the base 41 located in the case main body 30, and the outer peripheral part 42 which stands up by bending from the periphery of this base 41. However, the present invention is not limited to this. For example, the first cover 50 may have a shape in which the boundary between the base and the outer peripheral portion cannot be clearly separated such that the cross-sectional shape of the first lid 50 is semicircular or semielliptical. The same applies to the second lid 50 when the second lid 50 has the same structure as the first lid 40.

  Moreover, in the said embodiment, the joining part of the periphery of the 1st cover body 40 and the edge of the 1st opening edge part 33 of the case main body 30 is joined. However, the present invention is not limited to this. For example, in a state where the first lid 40 is fitted into the first opening edge 33 so that the peripheral edge of the first lid 40 is shifted into the case body 30 rather than the edge of the first opening edge 33, You may make it the periphery of the 1st cover body 40, and the internal peripheral surface of the 1st opening edge part 33 join.

  In the above embodiment, the case main body 30 opens in the Z direction, the first lid 40 corresponds to the bottom of the case 3, and the second lid 50 is provided with an external terminal structure. However, the present invention is not limited to this. As shown in FIGS. 15 to 17, the case body 30 may be opened in the Y direction, and an external terminal structure may be provided on the wall portion of the case body 30. Alternatively, although the opening area of the case main body 30 is reduced, the case main body 30 may be opened in the X direction, and an external terminal structure may be provided on the wall portion of the case main body 30.

  In the above embodiment, the case 3 has a three-piece structure including the case main body 30, the first lid body 40, and the second lid body 50. However, the present invention is not limited to this. As shown in FIGS. 18 to 20, for example, a conventional case in which the case body 30 is formed into a bottomed shape by deep drawing and a lid is welded to the opening edge of one end thereof may be used.

  In this case, another fixing member 108 may be applied to the ends of the adjacent batteries Ps on the side opposite to the fixing member 105, or to the ends of the adjacent batteries Ps and the termination member 111. . The fixing member 108 is formed in a long shape along the X direction. More specifically, the fixing member 108 is formed to have the same length as the fixing member 105 or the same length as the length of the bottom portion of the case body 30 in the X direction. The fixing member 108 is in a state in which the connecting member 113 is in contact with each fixing member 108 directly or indirectly from the Z direction so as to stride over the ends of the adjacent batteries Ps or adjacent batteries Ps. And it hold | maintains in the state contact | abutted ranging over the edge parts of the termination | terminus member 111. FIG.

  The fixing member 108 is merely in contact with the bottom of the case main body 30. Therefore, when functioning as a shielding member that partitions the external terminal 6 and the gas discharge valve 45 or functions as a shielding member that partitions the gas discharge path and the cooling flow path, a packing or flexible member is provided between the bottom of the case body 30 and the fixing member 108. It is preferable that a sealing member (seal member) such as a conductive rib is disposed. The flexible rib is preferably formed integrally with the fixing member 108.

  Moreover, in the said embodiment, the welding-type external terminal 6 is employ | adopted as an external terminal structure. However, the present invention is not limited to this. For example, a screw type external terminal may be used.

  Moreover, in the said embodiment, joining of the 1st cover body 40 and the 1st opening edge part 33 of the case main body 30, and joining of the 2nd cover body 50 and the 2nd opening edge part 35 of the case main body 30 are laser welding. It comes to be joined with. However, the present invention is not limited to this. The joining method can be performed by various means such as ultrasonic welding, resistance welding, caulking, and adhesion in addition to laser welding.

  Moreover, in the said embodiment, the wound-type electrode body 1 which wound the elongate positive electrode plate 13, the negative electrode plate 15, and the separator 12 is employ | adopted, respectively. However, the electrode body may be a laminate of a plurality of positive plates, negative plates and separators.

  Moreover, in the said embodiment, the lithium ion secondary battery was demonstrated. However, the type and size (capacity) of the battery are arbitrary.

  Further, the present invention is not limited to the lithium ion secondary battery. The present invention is also applicable to various secondary batteries, other primary batteries, and capacitors such as electric double layer capacitors.

  In the above embodiment, a frame 110 including a pair of terminal members 111 and a connecting member 113 is used as a holding body, and a plurality of stacked batteries Ps are tightened and held by the frame 110. However, the present invention is not limited to this. The holding body may be, for example, a case-shaped (box-shaped) housing that houses a plurality of batteries Ps with a gap therebetween.

  In the above embodiment, the positive electrode lead portion 14 and the negative electrode lead portion 16 of the electrode body 1 are connected to the current collector 2 at the intermediate portion in the Z direction. However, the present invention is not limited to this. For example, as shown in FIG. 21, the connection portion (welded portion) between the positive electrode lead portion 14 and the negative electrode lead portion 16 and the current collector 2 is moved away from the first lid body 40 and is closer to the second lid body 50 side. You may make it form. As a result, the degree of openness of the positive electrode lead portion 14 and the negative electrode lead portion 16 on the first lid body 40 side increases, so that the gas generated in the electrode body 1 can be discharged from the positive electrode lead portion 14 and the negative electrode lead portion 16. Can be increased.

  In the above embodiment, the relative positioning in the Y direction between the batteries Ps and between the batteries Ps and the terminal members 111 is performed by the spacer 100 and the fixing member 105. However, the present invention is not limited to this. The spacer 100 may be eliminated and only the fixing member 105 may be used.

  Further, when the spacer 100 and the fixing member 105 are provided, they may be integrated instead of separate. In this case, the spacer may be integrated with either one of the pair of fixing members in the Z direction or the other fixing member. Alternatively, if the spacer has a certain degree of flexibility, the pair of fixing members and the spacer may be integrated. In the form of FIG. 14 or the form of FIG. 20, the spacer 100 and the fixing member 108 may be integrated.

  Ps ... battery, 1 ... electrode body, 10 ... flat part, 11 ... folded part (arc part), 12 ... separator, 13 ... positive electrode plate, 14 ... positive electrode lead part, 15 ... negative electrode plate, 16 ... negative electrode lead part, 18 DESCRIPTION OF SYMBOLS ... Clip member, 2 ... Current collector, 20 ... 1st connection part, 21 ... Connection piece, 24 ... 2nd connection part, 25 ... Through-hole, 3 ... Case, 30 ... Case main body, 31 ... 1st wall part, 32 ... second wall, P1, P3 ... first end, P2, P4 ... second end, 33 ... first opening edge, 34 ... first opening, 35 ... second opening edge, 36 ... 2nd opening part, 40 ... 1st cover body, 41 ... Base part, 42 ... Outer peripheral part, 43 ... Recessed part, 44 ... Projection part, 45 ... Gas exhaust valve, 50 ... 2nd cover body, 51 ... Through-hole, 53 ... Base part 54 ... Outer peripheral part 6 ... External terminal 60 ... Body part 61 ... Flat surface 63 ... Caulking part 7 ... Internal gasket 70 ... Through hole 8 ... Outside Gasket, 80 ... concave portion, 81 ... through hole, M ... battery module, 100 ... spacer, 105 ... fixing member, 106 ... groove portion, 107 ... convex portion, 108 ... fixing member, 110 ... frame, 111 ... end member, 112 ... Convex part 113 ... Connecting member 114 ... Shield

Claims (6)

An electrode body that includes a positive electrode plate and a negative electrode plate that are insulated from each other, and has a laminated structure in which the positive electrode plate and the negative electrode plate are laminated in multiple layers ;
A case for housing the electrode body, a cylindrical case body having a pair of opening edges at both ends, a first lid for closing an opening formed by one opening edge, and the other opening edge A case provided with a second lid for closing the opening formed by the portion and insulated from the electrode body;
A gas discharge valve formed only on the first lid,
A positive electrode external terminal disposed on the outer surface of the second lid body and electrically connected to the positive electrode plate and a negative electrode external terminal electrically connected to the negative electrode plate;
The electrode body includes a protruding portion in which at least one of the positive electrode plate and the negative electrode plate protrudes in a stacked state as a lead portion , and the outer peripheral portion of the first lid body has the opening edge. It is a plate material that fits to the inner peripheral surface of the part and becomes convex in the case body,
The gas discharge valve is formed in a portion of the first lid that is opposed to the lead portion in a convex portion within the case body. The electricity storage device according to claim 1, wherein the gas discharge valve is formed on an outer surface of the first lid. The electrode body has a laminated structure in which the positive electrode plate and the negative electrode plate are wound, and includes a pair of opposed flat portions and a pair of folded portions that connect ends of the pair of flat portions. It is flat and at least one of the positive electrode plate and the negative electrode plate protrudes in a winding shape in a direction along the winding center of the electrode body from the side end of the other electrode plate. Provided with the protruding part as the lead part,
The power storage element according to claim 1, wherein the gas discharge valve is formed at a location facing the folded portion of the lead portion. The lead part includes a positive lead part at one end of the electrode body and a negative lead part at the other end of the electrode body,
The gas discharge valve, according to claim 1, further comprising a first gas discharge valve which is formed at a position opposed to the positive electrode lead portion, and a second gas discharge valve which is formed at a place facing the anode lead portion The electrical storage element of any one of Claim 3 . A plurality of power storage elements arranged in a first direction so that a gap is formed between adjacent power storage elements, each including a positive electrode plate and a negative electrode plate insulated from each other, and the positive electrode plate and the negative electrode An electrode body having a laminated structure in which plates are laminated in multiple layers, a case for housing the electrode body, and formed by a cylindrical case body having a pair of opening edges at both ends, and one opening edge. A first lid that closes the opening and a second lid that closes the opening formed by the other opening edge, and the case that is insulated from the electrode body, and only the first lid A plurality of power storage elements having a gas discharge valve formed and an external terminal disposed on an outer surface of the second lid in a second direction orthogonal to the first direction;
A shielding member that is disposed between the adjacent power storage elements and spatially partitions the external terminal and the gas exhaust valve;
In each of the plurality of power storage elements, the electrode body includes, as a lead portion, a protruding portion in which at least one of the positive electrode plate and the negative electrode plate protrudes in a stacked state . The lid is a plate member whose outer peripheral portion is fitted to the inner peripheral surface of the opening edge and is convex in the case main body, and the gas discharge valve is included in the case main body of the first lid. A power storage device formed at a location facing the lead portion in the convex portion. The power storage device according to claim 5 , wherein the shielding member spatially partitions the gap and the gas discharge valve.

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