JP6534656B2 - Power storage module and method of manufacturing power storage module - Google Patents

Description

  The present invention relates to a storage module and a method of manufacturing the storage module.

  In recent years, a storage module using a storage battery such as a lithium ion secondary battery, a nickel hydrogen battery, an electric double layer capacitor, or a lithium ion capacitor has been developed. Such a storage module has, for example, a storage battery in which storage batteries are connected in series or in parallel, and can be charged and discharged in a high voltage or large capacity state, and thus used for various applications as a power supply device There is.

  Conventionally, as a method of connecting the terminals of a plurality of storage batteries, there are a method of directly connecting the terminals, a method of connecting the terminals via a bus bar, and the like. Furthermore, in the case of directly connecting the terminals of two cells, there is a method in which the terminals are overlapped and connected by welding, one of which is the laser welding method. In the case of performing such laser welding, when the laser light passing through all the stacked terminals is irradiated to the other members of the cell or module, the cells or the other members may be damaged. Therefore, for example, a welding method has been proposed so that the laser light does not penetrate through the terminal on the opposite side to the laser irradiation in the stacked terminals.

JP 2003-338275 A International Publication No. 2006/016441

  However, in any of the direct connection between the terminals and the connection through the bus bar, if vibration is applied to the storage module for a long time, for example, as when mounted on a car, the phases of the terminals and the cells are shifted depending on the vibration. There is a risk of fatigue failure inside. In particular, when a heavy material such as a bus bar is fixed to the terminal, the stress on the inside of the terminal or the cell becomes large, and the possibility of fatigue failure increases.

  Moreover, when irradiating a laser beam, it is difficult to control the arrival depth of the laser beam of a high energy density which forms a keyhole in a thin plate like a terminal of a storage battery within the thickness of a terminal. And in a recent storage module, the terminal tends to be thinner, and as the terminal becomes thinner, control of laser irradiation becomes more difficult.

  In addition, as the energy of the laser beam irradiated to the terminals increases, the contact area between the terminals formed by the weld metal increases, and the connection of the terminals is formed to have higher strength and lower resistance. However, if it is attempted to obtain welding strength that does not affect the strength of the connection and the performance of the storage battery, the risk of the laser beam penetrating the terminal on the opposite side to the laser irradiation increases.

  In addition, a jig for absorbing the laser beam between the cell and the other member on the opposite side of the laser irradiation in the terminal overlapped so that the laser beam is not irradiated to the cell or the other member (hereinafter referred to as “lower support jig Can be considered.). However, in this case, the size of the module is increased in order to secure a space for inserting the lower receiving jig.

  The technology disclosed herein has been made in view of the above, and it is an object of the present invention to provide a storage module with high strength, low resistance, and a small size at a welded portion of a terminal and a method for manufacturing the storage module.

A storage module disclosed in the present application and a method of manufacturing the storage module include, in one aspect, a storage member for storing electricity, and a plurality of storage cells each having a positive electrode terminal and a negative electrode terminal protruding from the storage member. The storage cells are stacked, and the positive electrode terminal and the negative electrode terminal of different storage cells are stacked vertically to the stacking direction of the storage cells, and the storage member is placed at one end in the stacking direction. The storage cells are arranged by welding a fixing member fixed to each other and welding the fixing member, the positive electrode terminal and the negative electrode terminal, and the positive electrode terminals or the negative electrode terminals of the adjacent storage cells. It is connected in series or in parallel.

  According to one aspect of the storage module disclosed in the present application and the method of manufacturing the storage module, it is possible to achieve high strength and low resistance at the welded portion of the terminal while keeping the size small.

FIG. 1 is a perspective view of a storage module according to a first embodiment. FIG. 2 is a side view of the storage module according to the first embodiment. FIG. 3 is a front view of a single-sided terminal-shaped storage cell. FIG. 4 is a schematic view for explaining connection of the storage cell according to the first embodiment. FIG. 5 is a figure for demonstrating the irradiation state of a laser beam. FIG. 6 is a flowchart of a manufacturing process of the power storage module according to the first embodiment. FIG. 7 is a diagram of volume comparison of the storage module. FIG. 8 is a front view of a storage cell in the shape of both side terminals. FIG. 9 is a schematic view for explaining connection of the storage cell according to the second embodiment. FIG. 10 is a schematic view for explaining connection of the storage cell according to the third embodiment.

  Hereinafter, an embodiment of a storage module disclosed in the present application and a method of manufacturing the storage module will be described in detail based on the drawings. Note that the storage module disclosed in the present application and the method for manufacturing the storage module are not limited by the following embodiments.

  FIG. 1 is a perspective view of a storage module according to a first embodiment. FIG. 2 is a side view of the storage module according to the first embodiment. The storage module 1 shown in FIG. 1 includes a plurality of storage cells 2, an end plate 31, an end plate 32, and a bracket 4. The storage module 1 is, for example, a lithium ion capacitor module. Furthermore, the storage module 1 has a cell terminal fixing member 100 between the cells. In addition to the lithium ion capacitor module, a lithium ion battery module or an electric double layer capacitor module may be used.

  The cell terminal fixing member 100 has a metal plate 101, an insulating member 102 and a cell fixing member 103. The metal plate 101 is, for example, a single metal or an alloy mainly containing aluminum, iron or copper.

  The metal plate 101 has a thickness that is easy to control so that the laser beam stays inside at the time of laser welding as described later, and has a thickness such that the storage module 1 does not become heavy. For example, the thickness of the metal plate 101 is preferably in the range of 0.3 mm to 5 mm, and more preferably in the range of 0.3 mm to 3 mm.

  The insulating member 102 is, for example, a synthetic resin. In addition, the cell fixing member 103 is a single metal, an alloy, or a synthetic resin containing aluminum, iron or copper as a main component. Here, the synthetic resin is urea resin, phenol resin, unsaturated polyester resin, polyurethane, alkyd resin, epoxy resin, melamine resin, polyethylene, polyvinyl chloride, polystyrene, polypropylene, methacrylic resin, polycarbonate, polyamide, polyacetal, fluorocarbon resin, And may be modified species. Moreover, these single types or composite polymer alloys may be used. Also, depending on the application, a synthetic resin called engineering plastic having excellent strength and heat resistance, for example, an alloy of a modified polyphenylene ether resin and a styrene resin or polypropylene may be used. In the present invention, as an example, polyurethane is used for the insulating member 102 and aluminum alloy A5052 is used for the cell fixing member 103.

  The cell terminal fixing member 100 is configured as a member in which the metal plate 101 and the cell fixing member 103 are fixed to the insulating member 102 by insert molding or the like. The cell terminal fixing member 100 is an example of the “fixing member”. Other than insert molding, each part may be individually manufactured and fixed by fitting, bonding, screwing, or the like.

  And the electrical storage module 1 has the several electrical storage cell 2 which sealed the electrode laminated body which laminated | stacked the positive electrode and the negative electrode in the container of lamination material. In the storage module 1, for example, the double-sided adhesive tape is attached to the flat surface of each storage cell 2 with the cell fixing member 103 sandwiched between the flat surfaces, and the storage cell 2 is fixed to the cell fixing member 103. However, although fixed using a double-sided tape here, other methods may be used as long as the storage cell 2 can be fixed to the cell fixing member 103, and for example, an adhesive may be used. As a result, the storage cell 2 does not move relative to the cell fixing member 103. In addition, although the electrical storage module 1 of this embodiment showed the electrical storage module which mounted the electrical storage cell 2 of 12 sheets as an example, it is not limited to 12 sheets, but may be how many.

  FIG. 3 is a front view of a single-sided terminal-shaped storage cell. The storage cell 2 is, for example, a lithium ion capacitor cell. The storage cell 2 has a container 23 for accommodating an electrode stack (not shown), a positive electrode terminal 21 and a negative electrode terminal 22. The electrode laminate is configured by laminating a positive electrode, a negative electrode, and a separator (not shown), one power generation element being a unit, and a plurality of power generation elements being stacked. Other than lithium ion capacitors, lithium ion batteries, electric double layer capacitors, etc. may be used.

  The positive electrode has, for example, a structure in which a positive electrode made of a material capable of supporting lithium ions reversibly is formed on a positive electrode current collector. The positive electrode current collector is a member for collecting current while supporting the positive electrode, and is formed using, for example, a conductive metal plate such as aluminum. The positive electrode current collector is formed in a rectangular shape in a plan view, and has a structure in which a tab protrudes from one of the four sides. The tab of the positive electrode current collector is connected to the positive electrode terminal 21.

  The negative electrode has, for example, a structure in which a negative electrode made of a material capable of reversibly supporting lithium ions is formed on a negative electrode current collector. The negative electrode current collector is a member for collecting current while supporting the negative electrode, and is formed using, for example, a conductive metal plate such as copper. The negative electrode current collector is formed in a rectangular shape in a plan view, and has a structure in which a tab protrudes from one of the four sides. The tab of the negative electrode current collector is connected to, for example, the negative electrode terminal 22.

  The container 23 is, for example, a rectangular soft container of an aluminum laminated film material in which an aluminum foil is laminated with a resin film. Furthermore, the container 23 is a structure which sealed the electrode laminated body with the organic electrolyte containing lithium ion, for example. Since the container 23 seals the electrode stack and the organic electrolyte, the surface of the container 23 has a shape in which the shape of the electrode stack is raised near the center. The raised surface portion of the container 23 may be referred to as a cell main surface. In addition, as a layer configuration of the aluminum laminate film material, a PP (Polypropylene) layer, a PPa (polyphthalamide) layer, an AL (aluminum) layer, a nylon layer, PET (from the inner layer to the outer layer of the storage cell 2) The order of the PolyEthylene Terephtalate) layer. In addition, as a layer configuration of the aluminum laminate film material, for example, a PPa (polyphthalamide) layer, an AL (aluminum) layer, a nylon layer, and a PET (polyethylene terephthalate) layer may be sequentially formed. The container 23 in which the electrode laminate is housed is an example of the "power storage member".

  Furthermore, when the electrode stack is accommodated in the container 23, the storage cell 2 has a structure in which the positive electrode terminal 21 and the negative electrode terminal 22 project from one side of the four sides of the rectangular shape. The storage cell 2 having such a shape is referred to as a one-side terminal shape.

  The positive electrode terminal 21 is made of, for example, an aluminum material. The negative electrode terminal 22 is made of, for example, a copper material. The stacked storage cells 2 are connected in series by connecting the positive electrode terminal 21 and the negative electrode terminal 22. The positive electrode terminal 21 and the negative electrode terminal 22 have, for example, a thickness of about 0.3 mm and a width of about 68 mm.

  FIG. 4 is a schematic view for explaining connection of the storage cell according to the first embodiment. As shown in FIG. 4, the positive electrode terminal 21 and the negative electrode terminal 22 are bent substantially at right angles toward the storage cells 2 connected respectively.

  Then, the positive electrode terminal 21 and the negative electrode terminal 22 bent so that the positive electrode terminal 21 is closer to the container 23 are superimposed. In the following description, the direction from the positive electrode terminal 21 and the negative electrode terminal 22 toward the container 23 is downward, and the direction from the container 23 toward the positive electrode terminal 21 and the negative electrode terminal 22 is upward. That is, with the positive electrode terminal 21 down, the positive electrode terminal 21 and the negative electrode terminal 22 are overlapped so that the negative electrode terminal 22 is on the upper side. Furthermore, the positive electrode terminal 21 is bent so that the lower surface is in contact with the metal plate 101.

  Here, although the insulating member 102 is in contact with the container 23 of the storage cell 2 in FIG. 4, the insulating member 102 may perform insulation between the metal plate 101 and the cell fixing member 103. It does not have to be in contact with the container 23 or any other member.

  Then, the positive electrode terminal 21, the negative electrode terminal 22, and the metal plate 101 are pressed from above, for example, with a jig (hereinafter referred to as “upper pressing jig”) in a state of overlapping, so that they are crimped. It is pressed. The value of the pressure may be any value as long as the positive electrode terminal 21 and the negative electrode terminal 22 are in close contact with each other. You can suppress it. Further, according to a general processing method, since a processing tolerance always occurs, the positive electrode terminal 21 and the negative electrode terminal 22 can be brought into close contact by pressing with a force of, for example, about 1 kgf to 10 kgf.

  In this state, as shown in FIG. 5, the laser beam 200 is emitted from the upper side toward the negative electrode terminal 22. The laser beam 200 passes through the negative electrode terminal 22 and the positive electrode terminal 21 and is controlled to reach the inside of the metal plate 101. FIG. 5 is a figure for demonstrating the irradiation state of a laser beam.

  Here, as described above, the metal plate 101 is thicker than the positive electrode terminal 21 and the negative electrode terminal 22, and it is easy to control the laser beam 200 so that it does not stop and penetrate inside. Therefore, at the time of laser welding, the laser beam 200 is controlled so that the reaching depth is within the thickness of the metal plate 101. The irradiated laser beam 200 is absorbed inside the metal plate 101 and stops inside without penetrating the metal plate. The depth of penetration can be found by observing the cross-sections of the respective parts after welding and by evaluating to what depth the melting of the metal substantially occurs. Cross-sectional observation can be observed by an optical microscope, SEM (scanning electron microscope) or the like.

  As described above, when the laser beam 200 does not penetrate the metal plate 101, the metal is not melted down. Therefore, it is not necessary to particularly provide a space for inserting the lower receiving jig for receiving the molten metal between the positive electrode terminal 21 and the container 23. Moreover, by not using the lower receiving jig, the overall size of the storage module 1 can be kept small, and further, processing such as cleaning of the lower receiving jig can be omitted, and the manufacturing process can be simplified. .

  In addition, since the melting of the metal is eliminated, the underfill is improved, and the connection strength between the positive electrode terminal 21 and the negative electrode terminal 22 is improved.

  Further, by forming the welding portion in laser welding into a three-layer structure of the positive electrode terminal 21, the negative electrode terminal 22 and the metal plate 101, the positive electrode terminal 21 and the negative electrode terminal 22 are penetrated even when the high energy laser beam 200 is irradiated. The laser beam 200 stops in the metal plate 101. As described above, since welding with high energy is possible, the contact area between the positive electrode terminal 21 and the negative electrode terminal 22 is increased, and a welded portion with high strength and low resistance can be formed.

  Further, the welded positive electrode terminal 21 and negative electrode terminal 22 are fixed to the container 23 through the metal plate 101, the insulating member 102 and the cell fixing member 103. Thus, when the storage module 1 vibrates, the phases of the positive electrode terminal 21 and the negative electrode terminal 22 and the container 23 coincide with each other. Thereby, the phase shift between the positive electrode terminal 21 and the negative electrode terminal 22 and the container 23 is suppressed, and the repeated stress on the positive electrode terminal 21, the negative electrode terminal 22 or the container 23 due to the phase shift is reduced, thereby improving the vibration resistance. be able to.

  Returning to FIGS. 1 and 2, the description will be continued. The stacked storage cells 2 are connected in series by the laser welding described above.

  Two brackets 4 are disposed so as to hold each of two sides orthogonal to the side on which positive electrode terminal 21 and negative electrode terminal 22 of container 23 in stacked electric storage cell 2 are arranged. Furthermore, the end plates 31 and 32 are fixed to the bracket 4 and hold the storage cell 2 while holding the storage cell 2 in the stacking direction and applying pressure.

  Next, with reference to FIG. 6, the manufacturing process of the electrical storage module 1 which concerns on a present Example is demonstrated. FIG. 6 is a flowchart of a manufacturing process of the power storage module according to the first embodiment.

  The worker fixes the metal plate 101, the insulating member 102 and the cell fixing member 103 by insert molding or the like, and generates the cell terminal fixing member 100 (step S1).

  Next, the worker fixes the cell fixing member 103 to the container 23 (step S2). Thereby, the cell terminal fixing member 100 is fixed to the storage cell 2.

  Next, the worker stacks the storage cells 2 and further overlaps the positive electrode terminal 21 and the negative electrode terminal 22 from the container 23 side, and the positive electrode terminal 21 and the negative electrode are in contact with the metal plate 101. The terminal 22 is bent (step S3).

  Next, the worker attaches the end plates 31 and 32 and the bracket 4 to the stacked storage cells 2 and holds the storage cell 2 by the end plates 31 and 32 and the bracket 4 (step S4).

  Next, the worker presses the negative electrode terminal 22 from the direction opposite to the insulating member 102 by the upper pressing jig (step S5). Thereby, the bent negative electrode terminal 22, the positive electrode terminal 21, and the metal plate 101 are pressed in the direction of the insulating member 102.

  Next, the operator controls the laser beam to stop within the metal plate 101, irradiates the laser beam toward the negative electrode terminal 22, and welds the negative electrode terminal 22 and the positive electrode terminal 21 (step S6).

  As described above, in the storage module according to the present embodiment, the container of the storage cell and the terminal are fixed by the cell terminal fixing member. Thereby, even if vibration is applied to the storage module, the phases of the terminal and the container coincide with each other, and the repeated stress to the inside of the terminal or the cell is reduced. That is, vibration resistance can be improved. In particular, when the container is a laminate, the storage module 1 according to the present embodiment can greatly contribute to the improvement of the vibration resistance.

  Furthermore, the welded portion can have a three-layer structure of two terminals and a metal plate provided on the cell terminal fixing member, and even when high energy laser light is irradiated, the laser light can be stopped in the metal plate. . Therefore, welding can be performed with high energy, the contact area between the terminals can be increased, and a welded portion with high strength and low resistance can be formed.

  Furthermore, since the melting of the metal does not occur, there is no possibility that the molten metal adheres to the container or other members, and it is not necessary to arrange the lower receiving jig between the terminal and the container in order to prevent the adhesion. Thus, the storage module can be miniaturized by not providing a space for the lower receiving jig.

  For example, FIG. 7 is a diagram of volume comparison of power storage modules. The row indicated as the comparative example in FIG. 7 represents the volume of the storage module manufactured using the lower receiving jig. Moreover, the line described as an Example represents the volume of the electrical storage module 1 manufactured using the manufacturing method which concerns on a present Example. Furthermore, the line indicated as the rate of change indicates how much the volume of the example has changed relative to the volume of the comparative example. Furthermore, although there are two items of the one-sided terminal shape and the both-sided terminal shape, here, the case of the storage cell 2 of one-side angel shape is described, and the case of the storage cell of both-side terminal shape is described later.

  FIG. 7 shows the case of measurement using the following conditions. That is, it is assumed that the storage cell 2 has a cell thickness of 10 mm, a cell width of 100 mm, and a cell height of 100 mm in both the example and the comparative example. Furthermore, in the case of the comparative example, the terminal height is 15 mm. In the case of the example, the terminal height is 5 mm, and the thickness of the cell fixing member 103 is 0.3 mm.

  When the storage module 1 using the storage cell 2 having a single-sided terminal shape is manufactured using the lower receiving jig, the volume of the storage module 1 is 1185 cc. On the other hand, when the storage module 1 using the storage cell 2 having a single-sided terminal shape is manufactured using the manufacturing method according to the present embodiment, the volume of the storage module 1 is 1082 cc. And, the rate of change of the volume is -8.7%. As described above, it can be understood that the method of manufacturing the storage module 1 using the manufacturing method according to the present embodiment can reduce the volume and miniaturize as compared with the case of manufacturing using the lower receiving jig. .

(Modification)
Next, a modification is described. The first embodiment has been described using the storage cell 2 having a single-sided terminal shape in which the positive electrode terminal 21 and the negative electrode terminal 22 are provided on one side of the rectangular container 23, but the positions of the positive electrode terminal 21 and the negative electrode terminal 22 are the same. Not limited to.

  FIG. 8 is a front view of a storage cell in the shape of both side terminals. The storage module 1 of this modification uses a storage cell 2 in which a positive electrode terminal 21 is provided on one side of a container 23 having a rectangular shape as shown in FIG. 8 and a negative electrode terminal 22 is provided on the side facing the side. Such a storage cell 2 is referred to as a both-side terminal shape.

  Even in the case of the storage cell 2 in the shape of both side terminals, the container 23 is fixed to the cell fixing member 103 and the positive electrode terminal 21 and the negative electrode terminal 22 are welded and fixed together with the metal plate 101 as in the first embodiment. Then, the container 23, the positive electrode terminal 21 and the negative electrode terminal 22 are fixed.

  However, in the case of the storage cell 2 in the shape of both side terminals, since the positive electrode terminal 21 and the negative electrode terminal 22 are provided on opposite sides, welding is performed on the side of each side. In this case, the cell terminal fixing member 100 may have the insulating member 102 and the metal plate 101 at both ends of the cell fixing member 103. In addition, the cell terminal fixing member 100 having the insulating member 102 and the metal plate 101 at one end of the cell fixing member 103 may be used one by one on each side facing each other.

  And even if it is the electrical storage module 1 using the electrical storage cell 2 of the both-ends terminal shape, it has an effect similar to Example 1. FIG.

  For example, as shown in FIG. 7, when the storage module 1 using the storage cells 2 in the shape of both terminals is manufactured using the lower receiving jig, the volume of the storage module 1 is 1339 cc. On the other hand, when the storage module 1 using the storage cells 2 in the shape of both terminals is manufactured using the manufacturing method according to the present embodiment, the volume of the storage module 1 is 1133 cc. And the rate of change of the volume is -15.4%. As described above, even in the case of the present modification, it can be seen that the volume can be reduced and the size can be reduced as compared with the case of manufacturing using the lower receiving jig.

  FIG. 9 is a schematic view for explaining connection of the storage cell according to the second embodiment. In Example 1, the cell fixing member 103 is disposed so as to sandwich the cell 23 of the storage cell 2. However, the present invention is not limited to this. The cell fixing member 103 is fixed to the vessel 23, and the metal plate 101 is a positive electrode terminal. 21 and the negative electrode terminal 22 may be welded and fixed.

  Therefore, in the present embodiment, a configuration will be described in which the arrangement of the cell terminal fixing member 100 with respect to the storage cell 2 is different from that of the first embodiment.

  In the storage module 1 according to the present embodiment, the surfaces of the container 23 of the storage cell 2 are fixed by an adhesive tape, an adhesive, or the like.

  Then, the cell fixing member 103 is fixed to the opposite surface of one container 23 of the two fixed storage cells 2.

  The insulating member 102 is disposed on the surface of the cell fixing member 103 to which the container 23 is adhered, and is fixed to the cell fixing member 103.

  The metal plate 101 is disposed on the surface of the insulating member 102 opposite to the cell fixing member 103, and is fixed to the insulating member 102.

  The positive electrode terminal 21 extends from the container 23 bonded to the cell fixing member 103 to the surface of the metal plate 101 opposite to the insulating member 102. The negative electrode terminal 22 extends from the container 23 which is not bonded to the cell fixing member 103 to the position of the metal plate 101 so as to overlap the surface of the positive electrode terminal 21 opposite to the metal plate 101.

  A laser beam controlled so as to stop inside the metal plate 101 is irradiated from the side of the negative electrode terminal 22 and welded in the stacked positive electrode terminal 21, the negative electrode terminal 22 and the metal plate 101. Thereby, the positive electrode terminal 21 and the negative electrode terminal 22 are fixed to the metal plate 101.

  And, even in the state as shown in FIG. 9, the positive electrode terminal 21 and the negative electrode terminal 22 are attached to the cell fixing member 103 through the metal plate 101, the insulating member 102 and the cell fixing member 103. And fixed. Furthermore, the positive electrode terminal 21 and the negative electrode terminal 22 are also fixed to the other container 23 through the container 23 fixed to the cell fixing member 103.

  As described above, also in the storage module according to the present embodiment, even when vibration is applied to the storage module, no phase shift between the terminals and the container occurs, and repetition into the terminals or cells is made. Stress is relieved. That is, vibration resistance can be improved.

  Further, laser welding is the same as that of the first embodiment, and a welded portion with high strength and low resistance can be generated, and further, the storage module can be miniaturized.

  FIG. 10 is a schematic view for explaining connection of the storage cell according to the third embodiment. In the present embodiment, the arrangement of the cell terminal fixing member 100 with respect to the storage cell 2 is a configuration other than the first embodiment and the second embodiment.

  In the storage module 1 according to the present embodiment, the containers 23 of the two storage cells 2 are mounted and fixed on one surface of the cell fixing member 103 so that the positive electrode terminal 21 and the negative electrode terminal 22 face each other.

  The insulating member 102 is fixed between the two containers 23 on the surface of the cell fixing member 103 on which the container 23 is mounted.

  The metal plate 101 is disposed on the surface of the insulating member 102 opposite to the cell fixing member 103, and is fixed to the insulating member 102.

  The positive electrode terminal 21 extends from one of the facing containers 23 to the surface of the metal plate 101 opposite to the insulating member 102. The negative electrode terminal 22 extends from the other container 23 to the position of the metal plate 101 so as to overlap the surface of the positive electrode terminal 21 opposite to the metal plate 101.

  A laser beam controlled so as to stop inside the metal plate 101 is irradiated from the side of the negative electrode terminal 22 and welded in the stacked positive electrode terminal 21, the negative electrode terminal 22 and the metal plate 101. Thereby, the positive electrode terminal 21 and the negative electrode terminal 22 are fixed to the metal plate 101.

  Even in the state shown in FIG. 10, the positive electrode terminal 21 and the negative electrode terminal 22 are fixed to the container 23 through the metal plate 101, the insulating member 102, and the cell fixing member 103.

  As described above, also in the storage module according to the present embodiment, even when vibration is applied to the storage module, no phase shift between the terminals and the container occurs, and repetition into the terminals or cells is made. Stress is relieved. That is, vibration resistance can be improved.

  Further, laser welding is the same as that of the first embodiment, and a welded portion with high strength and low resistance can be generated, and further, the storage module can be miniaturized.

  Moreover, in the above description, the structure in which the positive electrode terminal 21, the negative electrode terminal 22, and the metal plate 101 are welded by laser welding has been mainly described, but in addition to laser welding, each component may be May be welded.

  Moreover, although the case where the positive electrode terminal 21 and the negative electrode terminal 22 were comprised with the different material was demonstrated in the above description, the positive electrode terminal and the negative electrode terminal may be comprised with the same material.

  In the above description, mainly the case where positive electrode terminal 21 and negative electrode terminal 22 are welded and connected in series has been described, but positive electrode terminals 21 of adjacent storage cells 2 or negative electrode terminals 22 are welded and connected in parallel The effect of the present invention is similarly exhibited even when connecting to

DESCRIPTION OF SYMBOLS 1 storage module 2 storage cell 4 bracket 21 positive electrode terminal 22 negative electrode terminal 23 container 31, 32 end plate 100 cell terminal fixing member 101 metal plate 102 insulating member 103 cell fixing member

Claims (11)

A storage member for storing electricity; and a plurality of storage cells each having a positive electrode terminal and a negative electrode terminal protruding from the storage member;
The storage cells are stacked,
The positive electrode terminal and the negative electrode terminal of different storage cells are stacked vertically to the stacking direction of the storage cells, and a fixing member fixed to the storage member is disposed at one end in the stacking direction, The storage cells are connected in series or in parallel by welding a fixing member, the positive electrode terminal and the negative electrode terminal, and the positive electrode terminals or the negative electrode terminals of the adjacent storage cells. Storage module to be. The fixing member includes a metal plate, an insulating member, and a cell fixing member.
The metal plate is in contact with the stacked positive electrode terminal and the one end in the stacking direction of the negative electrode terminal,
The cell fixing member is fixed to the electric storage member,
The storage module according to claim 1, wherein the insulating member is disposed between the metal plate and the cell fixing member.   The said welding is irradiated with a laser beam from the side of the laminated | stacked said positive electrode terminal or the said negative electrode terminal, It is laser welding by making the inside of the said fixing member into a reach | attainment depth, It is characterized by the above-mentioned. Storage module.   The said metal plate is a metal single-piece | unit or alloy which had aluminum, iron, or copper as a main component, The electrical storage module of Claim 2 characterized by the above-mentioned.   The power storage module according to claim 2, wherein the insulating member is an insulator containing a synthetic resin as a main component.   The power storage module according to claim 2, wherein the cell fixing member is a single metal, an alloy, or a synthetic resin containing aluminum or iron as a main component.   The storage module according to claim 1, wherein the positive electrode terminal and the negative electrode terminal are made of the same material.   The storage module according to claim 1, wherein the positive electrode terminal and the negative electrode terminal are made of different materials.   The said positive electrode terminal consists of a material which has aluminum as a main component, The electrical storage module of Claim 8 characterized by the above-mentioned.   The said negative electrode terminal consists of a material which has copper as a main component, The electrical storage module of Claim 8 characterized by the above-mentioned. What is claimed is: 1. A method of manufacturing a storage module comprising: a storage member for storing electricity; and a plurality of storage cells having a positive electrode terminal and a negative electrode terminal protruding from the storage member,
Stacking the storage cells,
Laminating the positive electrode terminal and the negative electrode terminal of the different storage cells in a direction perpendicular to the stacking direction of the storage cells ;
A fixing member fixed to the electricity storage member is disposed at one end in the stacking direction,
The storage cells are connected in series or in parallel by welding the fixing member, the positive electrode terminal and the negative electrode terminal, or the positive electrode terminals or the negative electrode terminals of the adjacent storage cells. Module manufacturing method.

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