JP6083371B2 - Assembled battery - Google Patents

Description

  The present invention relates to a battery pack including a battery stack and a circuit board including a battery state detection unit that detects a state of a battery cell, and the circuit board is disposed on an electrode terminal side of the battery stack.

  Conventionally, a battery state monitoring system described in Patent Document 1 is known. In this system, an individual battery state notification unit (subunit) is disposed in each of a plurality of battery stacks, and a battery state monitoring unit that aggregates information from each subunit is disposed in one of the battery stacks. .

  This system also provides a battery state monitoring system having a battery state notification unit that can be easily used between battery packs having different numbers of battery cells. For this purpose, the battery state notification unit is provided with a plurality of subunits. And these subunits are producing | generating the battery state information which shows the state of a battery cell.

  The battery state information is generated based on the voltage signal and the cell temperature signal output from the temperature sensor unit. In addition, a battery voltage change sensing terminal is used as a terminal leg for supporting the subunit. This terminal leg is fixed to the bus bar module.

JP2013-30312A

  When the bus bar module and the subunit are arranged on the basis of the idea of the above-mentioned Patent Document 1, the subunit is arranged immediately above the battery stack, so that electric noise including electromagnetic noise or electrostatic noise from the battery is a problem. It becomes. This electrical noise is generated because the current flowing out of the battery passes through the inverter and the current is interrupted in the inverter. This electrical noise adversely affects a subunit having an electronic circuit (hereinafter also referred to as a circuit board including a battery state detection unit or simply a circuit board).

  Furthermore, when a circuit board including a battery state detection unit is arranged on the battery stack, there is a bus bar module as a member for fixing the circuit board. This bus bar module has a structure that absorbs a dimensional tolerance in the battery cell stacking direction. It is necessary to have. Therefore, in patent document 1, the sensing terminal is used as a terminal leg part which is a member that supports the circuit board, and the terminal leg part cannot follow the battery size variation due to charge / discharge, and the battery state detection part lacks reliability. .

  In other words, the circuit board needs to capture a very small voltage change or the like, whereas in Patent Document 1, a voltage change sensing terminal is used as a terminal leg portion that supports the circuit board. For this reason, when the dimensional change of the battery cell accompanying a temperature change or charging / discharging occurs, the circuit board is exposed to mechanical stress due to the concentration of stress on the terminal leg or the circuit board and lacks reliability.

  In view of the above problems, the present invention does not cause a problem of electrical noise from the battery stack even when the circuit board is arranged in the battery stack, and mechanical stress due to stress concentration on the circuit board is not caused. An object of the present invention is to provide an assembled battery that is not problematic and has excellent reliability.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

In order to achieve the above object, the present invention employs the following technical means. That is, in one of the present invention, the assembled battery (100) includes a battery stack (11) in which a plurality of battery cells (1) are stacked in series. The assembled battery (100) is connected to the battery stack (11) and is not affected by the fluctuation of the position of the individual battery cells (1) due to the expansion of the battery cells (1) or the stacking of the battery cells (1). A fixing member (4) is provided. The assembled battery (100) includes a circuit board (3) that is attached to the circuit board fixing member (4) and includes a battery state detection unit that detects the state of the battery cell (1), and a grounded conductive shield member (15). The circuit board (3) is fixed to the circuit board fixing member (4) with a shield member (15) sandwiched between it and the battery stack (11). Electrical noise and mechanical stress from the battery stack (11) to the circuit board (3) are cut off.
Furthermore, a plurality of bus bar cases that house bus bars (8) connected to the electrode terminals (6, 7) of each battery cell (1) and are arranged on both the positive side and the negative side of the battery stack (11). (9)
The circuit board fixing member (4) is coupled between the bus bar cases (9) on both sides,
The bus bar case (9) and the circuit board fixing member (4) are coupled by a coupling part (10) that absorbs a dimensional variation between the bus bar case (9) and the circuit board fixing member (4).

According to this invention, it has the circuit board fixing member (4) which is not influenced by the fluctuation | variation of the position of a battery cell (1). Therefore, by attaching the circuit board (3) to the circuit board fixing member (4) that is not subjected to the mechanical stress accompanying the dimensional variation, no mechanical stress is applied to the circuit board (3). Moreover, since the shield member (15) provided between the battery stack (11) and the circuit board (3) is provided, no electrical noise is added to the circuit board (3).
In addition, according to the present invention, the bus bar case (9) and the circuit board fixing member (4) are coupled by the coupling portion (10), thereby absorbing the dimensional variation associated with the stacking of the battery cells (1). . Therefore, the circuit board fixing member (4) is not affected by the dimensional variation accompanying the stacking of the battery cells (1). Therefore, by attaching the circuit board (3) to the circuit board fixing member (4) that is not subjected to the mechanical stress accompanying the dimensional variation, no mechanical stress is applied to the circuit board (3). Moreover, since the shield member (15) provided between the battery stack (11) and the circuit board (3) is provided, no electrical noise is added to the circuit board (3).

  Next, in one of the present invention, the battery control part (16) which takes in the signal from a circuit board (3) and controls a battery cell (1) is further provided. The battery control unit (16) is connected to the shield member (15), and electrical noise from the battery stack (11) to the battery control unit (16) is blocked by the shield member (15).

  According to this invention, the battery control part (16) which takes in the signal from a circuit board (3) and controls a battery cell (1) is provided. Since the battery control unit (16) is connected to the shield member (15), electrical noise from the battery stack (11) to the battery control unit (16) can be blocked using the shield member.

  Next, in one aspect of the present invention, the circuit board (3) includes one circuit board (3a) and the other circuit board (3b). The battery control unit (16) is provided between one circuit board (3a) and the other circuit board (3b), and the battery control unit (16) includes one circuit board (3a) and the other circuit board (3b). It is connected to both shield members (15) with the circuit board (3b). According to the present invention, the shield member (15) of both circuit boards (3a, 3b) can surely exert a shielding effect on the battery control section (16).

  Next, in one aspect of the present invention, the shield members (15) are arranged in two rows along the stacking direction of the battery cells (1) between the circuit board (3) and the battery stack (11). . The shield members (15a, 15b) arranged in the two rows are separated and independent from each other, and are connected to each other using the casing (16a) of the battery control unit (16) as a relay unit.

  According to the present invention, since the shield members (15a, 15b) arranged in two rows are separated and independent from each other, one circuit board (3) is placed between the two rows of shield members (15a, 15b). It becomes possible to provide a part. Thereby, size reduction becomes possible. The shield members arranged in two rows are separated and independent from each other. However, since the shield members are electrically connected to each other via the casing (16a), a shielding effect is exhibited.

  Next, in one of the present invention, the restraint band (21) that extends in the stacking direction of the battery cells (1) and restrains the battery cells (1) and the restraint band (21) are combined to form a battery stack. And an end plate (22) constituting the terminal end of (11). The battery stack (11) fixes the position of the stacked battery cells (1) with a restraining band (21) and an end plate (22). The circuit board fixing member (4) is coupled to the restraining band (21), and the shield member (15) is grounded via the end plate (22).

  According to the present invention, attention is paid to the fact that the restraining band (21) that restrains the stacked battery cells (1) is not subjected to dimensional fluctuation due to expansion of the battery cells (1). Since the circuit board fixing member (4) is coupled to the restraining band (21), the circuit board fixing member (4) is not affected by the dimensional variation associated with the stacking of the battery cells (1). Therefore, by attaching the circuit board (3) to the circuit board fixing member (4) that is not subjected to the mechanical stress accompanying the dimensional variation, no mechanical stress is applied to the circuit board (3). Moreover, since the shield member (15) is grounded via the end plate (22), no electrical noise is added to the circuit board (3).

  Next, in one aspect of the present invention, the shield member (15) is composed of a metal plate provided in contact with the circuit board (3), and the circuit board, the shield member (15), and the circuit board fixing member (4). Are fastened to each other by a fastener (18).

  According to this invention, the shield member (15) comprised with the metal plate is utilized as a reinforcement member which reinforces a circuit board (3). And the intensity | strength of a circuit board fixing member (4) increases and it can further ensure the effect | action that a circuit board fixing member (4) does not receive to the influence of the position fluctuation | variation of a battery cell (1). Therefore, it is possible to suppress the electrical and mechanical stress from acting on the circuit board (3), and to improve the reliability of the assembled battery.

  In addition, the code | symbol in parentheses as described in a claim and said each means thru | or description is an example which shows the correspondence with the specific means as described in embodiment mentioned later easily, and limits the content of invention is not.

It is a perspective view of the assembled battery in 1st Embodiment of this invention. It is the perspective view which looked at the assembled battery of FIG. 1 from another angle. It is a disassembled perspective view explaining the assembly | attachment state of each component of FIG. FIG. 4 is a perspective view of a board module showing a state in which each component of FIG. 3 is assembled. It is a disassembled perspective view explaining the assembly | attachment state of each component in 2nd Embodiment of this invention. FIG. 6 is a perspective view of a board module showing a state in which the components of FIG. 5 are assembled. It is a perspective view of the assembled battery in 3rd Embodiment of this invention. FIG. 8 is a partially broken side view seen from the direction of arrow VIII in FIG. 7.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where a part of the configuration is described in each form, the other forms described above can be applied to the other parts of the configuration.

  Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also the embodiments are partially combined even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 shows an assembled battery according to the first embodiment. FIG. 2 shows a state where the assembled battery 100 of FIG. 1 is viewed from another angle. FIG. 3 shows an assembled state of each part of FIG. FIG. 4 shows a state in which the components of FIG. 3 are assembled.

  In FIG. 1, an assembled battery 100 is configured in which a plurality of battery cells 1 (not shown) are stacked and pressed to restrain the battery cells 1 in the stacking direction (up and down direction in FIG. 1). The battery cell 1 is placed in a recess of a resin member 11a (FIG. 2) on a plurality of cases, and is laminated in the vertical direction of FIG. 1 together with the resin member 11a.

  The assembled battery 100 includes circuit boards 3a and 3b including a battery state detection unit that detects a voltage of the battery cell 1, a circuit board fixing member 4 configured as a board case extending in the stacking direction, and a circuit board fixing member. 4 and a wiring unit (not shown).

  In addition, when showing both or one of the circuit boards 3a and 3b, they are simply referred to as the circuit board 3. In FIG. 1, the wiring portion is omitted. As an example, the wiring portion connects a plurality of bus bars 8 made of copper plates juxtaposed in the stacking direction and the circuit board 3 to be connected to the electrode terminals 6 and 7 (FIG. 2) of each battery cell 1.

  The bus bar 8 is provided with two holes into which the electrode terminals 6 and 7 are inserted and joined. The wiring portion is flexible at least in part, and allows the bus bar 8 to move in the stacking direction. Further, a bus bar case 9 serving as a synthetic resin bus bar holding member surrounding the bus bar 8 is provided.

  The bus bar case 9 is coupled and integrated with the circuit board fixing member 4 by a large number of coupling portions 10 (FIG. 3). The coupling portion 10 includes a number of claw portions and a hole portion into which the claw portions are fitted. A bus bar 8 is housed in the bus bar case 9. The plurality of bus bar cases 9 are connected to each other in the stacking direction of the battery cells 1. Bus bar cases 9 are arranged in two rows on both sides of the circuit board fixing member 4.

  As described above, the bus bar case 9 is coupled to the circuit board fixing member 4 via the coupling portion 10. The bus bar module 12 is a general term for the bus bar 8, the bus bar case 9, and the circuit board fixing member 4 coupled to each other.

  The joint portion 10 between the bus bar case 9 and the circuit board fixing member 4 has a claw portion and a rectangular hole portion into which the claw portion is fitted. A hole formed in the bus bar case 9 is coupled to a claw provided in the circuit board fixing member 4. Note that the claw portion of the bus bar case 9 may be coupled to the hole provided in the circuit board fixing member 4.

  The dimension of the hole in the stacking direction is set so as to allow the movement of the bus bar 8 in the stacking direction relative to the width of the claw in the stacking direction. In addition, the magnitude | size of the preset clearance is determined based on the dispersion | variation in the position of the lamination direction of the battery cell 1. FIG.

  A plurality of bus bar cases 9 are connected and integrated by bent portions (not shown) that are rich in flexibility. A plurality of bus bar cases 9 integrated and stretchable are coupled to the circuit board fixing member 4 by a coupling portion 10. This coupling | bond part 10 comprises the dimension fluctuation | variation absorption part with the clearance between a nail | claw part and a hole.

  The bent portion is made of resin and can be elastically deformed, and constitutes a vent mechanism capable of absorbing dimensional variations. In addition, the bus bar 8 made of metal can be accommodated in the synthetic resin bus bar case 9 by insert molding or coupling by snap fitting. The snap fit is an assembly method in which a convex holding portion provided in a part is mechanically fixed by being fitted into and hooked into a concave portion on the receiver side using the elasticity of the material. In this embodiment, the bus bar 8 is coupled to the bus bar case 9 by a snap fit.

  If the number of battery cells 1 is N, for example 14, the number of inter-cell connections connecting the battery cells 1 and 1, that is, the number of bus bars 151 connecting the cells is N−1. For example, 13 pieces. Further, the plurality of bus bar cases 9 are connected to each other by the bent portions, and the number of bus bar cases 9 are connected to each other by the bent portions is determined by the number of cells.

  A rectangular hole into which the claw portion of the coupling portion 10 is fitted is formed long along the stacking direction of the battery cells 1. Thereby, the nail | claw part fitted by the rectangular hole part can move in a hole direction in a lamination direction. That is, a hole having a length dimension larger than the width of the claw by the clearance is provided. As a result, a clearance forming a dimensional error absorbing portion is formed between the claw portion and the hole portion.

  In FIG. 2, a battery stack 11 is configured in which a plurality of battery cells 1 are stacked in series. A bus bar 8 for connecting the terminals of each battery cell 1 is accommodated, and a plurality of bus bar cases 9 are arranged on both the positive side and the negative side of the battery stack 11.

  A circuit board fixing member 4 in which a smoke exhaust duct space 13 (not shown) is formed is provided between the bus bar cases 9 on both sides and the resin member 11a (FIG. 2) on the battery stack 11 side. The circuit board fixing member 4 constitutes a bus bar module main body.

  A circuit board 3 including a battery state detection unit that closes the anti-battery stack side of the circuit board fixing member 4 and detects the state of the battery cell 1 is provided. Although there is no dedicated part for forming the smoke exhaust duct space 13, a smoke exhaust duct space 13 is formed in the space between the circuit board fixing member 4 and the resin member 11a on the battery stack 11 side to exhaust smoke when the battery is abnormal. ing.

  A conductive shield member 15 (FIG. 3) is provided between the circuit board fixing member 4 and the circuit board 3 and is grounded. The shield member 15 may be made of conductive resin, but is preferably composed of a ground metal plate made of a rigid metal plate.

  In FIG. 3, the circuit board 3 has a lid 3c. By connecting the bus bar case 9 and the circuit board fixing member 4 with a plurality of connecting portions 10, a bus bar module 12 is formed that absorbs dimensional variations associated with the stacking of the battery stack 11. The circuit board 3 is fixed to the bus bar module 12 via the shield member 15, and electrical noise from the battery stack 11 and the bus bar module 12 to the circuit board 3 is blocked by the shield member 15.

  A battery control unit 16 that takes in a signal from the circuit board 3 and controls the battery cell 1 is provided at the longitudinal center of the circuit board fixing member 4. The battery control unit 16 is also referred to as a battery ECU, and a microcomputer or the like is mounted therein. The casing 16a is electrically connected to the shield member 15 to block electrical noise from the battery stack 11 side into the battery control unit 16. This electrical noise is generated when the current flowing out of the battery cell 1 passes through an inverter (not shown).

  The battery control unit 16 is provided between one and the other circuit boards 3a and 3b. The shield member 15 provided on the bus bar module 12 side of the circuit board 3 and the casing 16a of the battery control unit 16 are connected. That is, the casing 16 a of the battery control unit 16 functions as a relay unit that connects the four ground metal plates constituting the shield member 15. The casing 16a of the battery control unit 16 is a metal rigid case.

  The shield member 15 is a ground metal plate made of a metal plate. Therefore, the earth sheet metal of one circuit board 3a, the metal casing 16a of the battery control unit 16, and the earth sheet metal of the other circuit board 3b are connected. Thereby, the shield member 15 made of the ground metal plate is utilized as a reinforcing member for reinforcing the entire circuit board 3. The casing 16a is grounded via the shield member 15 from one and the other.

  The shield members 15 are arranged between the circuit board 3 and the bus bar module 12 in two rows that are divided into the plus side and the minus side of the battery cell 1 along the stacking direction of the battery stack 11. The shield members 15 arranged in two rows are composed of two pieces of ground metal plates 15a and 15b which are separated and independent from each other. The ground metal plates 15 a and 15 b are not bridged across the circuit board fixing member 4. This is because such a bridging portion interferes with the constituent members of the circuit board 3 and becomes an obstacle. Therefore, the two pieces of the ground metal plates 15 a and 15 b are electrically connected to each other via the casing 16 a of the battery control unit 16. Accordingly, it is only necessary to ground one of the two pieces of the ground metal plates 15a and 15b.

  FIG. 2 is a view from another angle so that the end of the assembled battery 100 of FIG. 1 can be clearly understood. An end plate 17 made of metal and having high rigidity is used at the end of the assembled battery 100. Since the end plate 17 is grounded to the vehicle body, one of the ground metal plates 15 a and 15 b is connected to the end plate 17.

  In the first embodiment, the circuit board 3, the lid 3 c of the circuit board 3, and the battery control unit 16 are fastened to the ground metal plates 15 a and 15 b with a number of fasteners 18 such as screws. That is, first, the bus bar module 12 is formed by assembling the bus bar cases 9 on both sides in which the bus bars 8 are stored and the circuit board fixing members 4 for connecting the bus bar cases 9 on both sides. The ground metal plates 15 a and 15 b are coupled onto the bus bar module 12, and the circuit board 3, the lid 3 c of the circuit board 3, and the battery control unit 16 are further attached thereto with twelve fasteners 18.

  The ground metal plate 15a is a ground terminal portion 15a1 and is connected to the end plate 17 of FIG. 2 and grounded. The other terminal portion 15a2 of the ground metal plate 15a is connected to the ground portion 16a1 of the metal casing 16a. The ground portions 16a1 and 16a2 of the housing 16a are electrically connected to each other by the housing 16a. Since there is no need for a wiring portion that bridges the space between the ground metal plates 15a and 15b that are separated from each other, the components of the circuit board 3 are not obstructed. FIG. 4 shows the shape of the substrate module on the upper part of the assembled battery completed by the assembly of FIG. The upper part of the assembled battery 100 can be assembled as a substrate module, which is a single component, into the battery stack 11 that forms the lower part of the separately assembled battery 100.

(Operational effects of the first embodiment)
In the first embodiment described above, the circuit board fixing member 4 that is not affected by the fluctuation of the position of the individual battery cells 1 accompanying the expansion of the battery cells 1 or the stacking of the battery cells 1 is used as a basis. On 4, the shield member 15 and the circuit board 3 were attached.

  Specifically, the battery stack 11 of the assembled battery 100 is configured in which a plurality of battery cells 1 are stacked and the battery cells 1 are pressed and restrained in the stacking direction. The assembled battery 100 includes a circuit board 3 of a battery state detection unit that detects a voltage of the battery cell 1, a circuit board fixing member 4 extending in the stacking direction, and a wiring unit (not shown) disposed on the circuit board fixing member 4. It has.

  The wiring portion connects a plurality of bus bars 8 (not shown) connected to the electrode terminals 6 and 7 of each battery cell 1 and juxtaposed in the stacking direction to the circuit board 3. A bus bar case 9 surrounding the bus bar 8 is also provided. The bus bar case 9 has a coupling portion 10 having a claw portion that is coupled to the circuit board fixing member 4 by fitting.

  According to this, the bus bar case 9 and the coupling portion 10 having the claw portion are provided between the bus bar 8 that is required to adjust the mounting position and the circuit board 3 that is required to determine the mounting position. Have The bus bar case 9 is coupled to the circuit board fixing member 4 by fitting. Moreover, the position of a nail | claw part can adjust the coupling | bond part 10 with the clearance required for a fitting. Thereby, even if an accumulated error occurs in the mounting position of the bus bar 8, the accumulated error can be absorbed. In other words, the position of the circuit board fixing member 4 does not change even if a cumulative error occurs in the mounting position of the bus bar 8. Therefore, the mechanical stress due to the stacking of the battery cells 1 or the expansion when the battery cells 1 are used does not affect the circuit board 3 and the battery control unit 16 arranged on the circuit board fixing member 4.

  Next, the coupling | bond part 10 is comprised when a nail | claw part is inserted in a hole. And the length dimension of the battery cell lamination direction of a hole is set to the clearance which permits the movement of the lamination direction of the bus bar 8 with respect to the width of the lamination direction of a nail | claw part.

  In other words, the length dimension of the hole in the stacking direction is set to a clearance that allows the movement of the bus bar 8 in the stacking direction relative to the width of the claw in the stacking direction. Therefore, the position of the coupling portion 10 having the claw portion can be adjusted by the preset clearance. Since the position of the coupling portion 10 is adjustable, even if an accumulated error occurs in the mounting position of the bus bar 8, the accumulated error can be absorbed. This cumulative error also occurs due to variations in the width of the battery cell 1 and deformation.

  Next, a plurality of bus bar cases 9 are connected to each other by bent portions to form a linear integrated body that can be elastically deformed, and the integrated bus bar cases 9 are formed on both sides of the circuit board fixing member 4. The circuit board fixing member 4 is coupled by a coupling portion 10 having a claw portion.

  The entire bus bar case 9 integrated linearly can include a triple bus bar case in which the three bus bar cases 9 are connected to each other, or a quadruple bus bar case in which the four bus bar cases 9 are connected. . According to this, the whole bus bar case 9 can be configured integrally by connecting the three bus bar cases or the four bus bar cases with a small number of bent portions.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described. In addition, about 2nd Embodiment or less, the same code | symbol as 1st Embodiment shows the same structure, Comprising: The description which precedes is used.

  FIG. 5 shows a second embodiment. In FIG. 5, the bus bar case 9, the circuit board fixing member 4, the ground metal plates 15a, 15b, 15c constituting the shield member 15, the circuit board 3 (3a, 3b) including the battery state detection unit, and the inside The assembled state with the battery control unit 16 having a circuit is shown. In the second embodiment, the circuit board 3 and the battery control unit 16 are fastened to the ground metal plates 15a to 15c attached to the circuit board fixing member 4 side by a number of fasteners 18 such as screws.

  That is, first, a bus bar module 12 is formed by assembling two rows of bus bar cases 9 on both sides in which bus bars 8 (not shown) (same as FIG. 2) are housed and the circuit board fixing member 4 connecting the bus bar cases 9 on both sides. Keep it. The ground metal plates 15 a to 15 c are placed on the bus bar module 12, and the circuit board 3 and the battery control unit 16 are attached with the fasteners 18 from above.

  The shield member 15 that shields the electrical noise of the circuit board 3 is composed of a total of six ground sheets. The ground metal plate 15c is connected to the end plate 17 of FIG. 2 to be grounded at the ground terminal portion 15c1. The other terminal portion 15c2 of the ground metal plate 15c is connected to a shield member 15 (not shown) in the circuit board 3b. The shield member 15 (not shown) in the circuit board 3 b is connected to the ground metal plate 15 a, and the ground metal plate 15 a is connected to the housing 16 a of the battery control unit 16. The ground metal plate 15 b is connected to the housing 16 a of the battery control unit 16. Similarly, the shield member 15 that shields the electrical noise of the circuit board 3a is also made of a ground plate, and these ground plates are connected to the opposite end plate and grounded.

  The ground metal plate 15a and the ground metal plate 15b are connected to each other using the casing 16a as a relay portion. Accordingly, there is no need for a wiring portion that bridges the space between the ground metal plates 15a and 15b, so that the circuit board 3 is not obstructed. FIG. 6 shows the shape of the board module at the top of the assembled battery 100 completed by assembling the components shown in FIG. The upper part of the assembled battery 100 can be assembled into a battery stack 11 constituting the lower part of the assembled battery 100 separately assembled as a substrate module which is one component.

(Operational effect of the second embodiment)
In the second embodiment, the assembled battery includes a battery stack 11 in which a plurality of battery cells 1 are connected in series and stacked, and an individual battery that is connected to the battery stack 11 and that accompanies expansion or stacking of the battery cells 1. And a circuit board fixing member 4 that is not affected by fluctuations in the position of the battery cell 1. The assembled battery includes a circuit board 3 that is attached to the circuit board fixing member 4 and includes a battery state detection unit that detects the state of the battery cell 1, and a grounded conductive shield member 15. The circuit board 3 is fixed to the circuit board fixing member 4 with the shield member 15 interposed between the battery stack 11 and electrical noise and mechanical stress from the battery stack 11 to the circuit board 3 are blocked.

  According to this, it has the circuit board fixing member 4 which is not influenced by the fluctuation | variation of the position of the battery cell 1. FIG. Therefore, the mechanical stress is not applied to the circuit board 3 by attaching the circuit board 3 to the circuit board fixing member 4 that is not subjected to the mechanical stress accompanying the dimensional variation. In addition, since the shield member 15 provided between the battery stack 11 and the circuit board 3 is provided, no electrical noise is added to the circuit board 3.

  Further, a battery control unit 16 that takes in a signal from the circuit board 3 and controls the battery cell 1 is provided, and the battery control unit 16 is connected to the shield member 15 so as to reach the battery control unit 16 from the battery stack 11. Noise is blocked by the shield member 15.

  According to this, the battery control part 16 which takes in the signal from the circuit board 3 and controls the battery cell 1 is provided. Since the battery control unit 16 is connected to the shield member 15, electrical noise from the battery stack 11 to the battery control unit 16 can be blocked using the shield member.

  In addition, the battery control unit 16 is provided with an electronic circuit in a metal casing 16a, and the casing 16a is connected to the shield member 15 to block electrical noise from the battery stack 11 to the battery control unit 16. Is done.

  According to this, in the battery control unit 16, an electronic circuit is provided in the metal casing 16 a and the casing 16 a is connected to the shield member 15. Thereby, the metal housing 16a can be grounded, and electrical noise radiated from the battery stack 11 to the electronic circuit in the housing 16a can be blocked.

  The circuit board 3 has one circuit board 3a and the other circuit board 3b, and the battery control unit 16 is provided between the one circuit board 3a and the other circuit board 3b. And the battery control part 16 is connected to the shield member 15 of both the one circuit board 3a and the other circuit board 3b. According to this, the shielding effect can be reliably exerted on the battery control unit 16 by the shielding members 15 of both the circuit boards 3a and 3b.

  Further, the shield member 15 is made of a metal plate provided in contact with the circuit board 3, and the circuit board, the shield member 15, and the circuit board fixing member are fastened to each other by a fastener 18.

  According to this, the shield member 15 made of a metal plate is utilized as a reinforcing member that reinforces the circuit board 3. And the intensity | strength of the circuit board fixing member 4 increases, and the effect | action that the circuit board fixing member 4 is not influenced by the position change of the battery cell 1 can be made still more reliable. Therefore, it is possible to suppress the electrical and mechanical stress from acting on the circuit board 3, and to improve the reliability of the assembled battery.

(Third embodiment)
Next, a third embodiment of the present invention will be described. A different part from above-described embodiment is demonstrated. The first embodiment and the like are based on a circuit board fixing member that is not affected by fluctuations in the position of individual battery cells accompanying expansion of battery cells or stacking of battery cells, and a shield is formed on the circuit board fixing member. A circuit board including a member and a battery state detection unit was attached. A circuit board case coupled between the bus bar cases was used as the circuit board fixing member. This substrate case is coupled to the bus bar case via a coupling portion for absorbing dimensional variations.

  On the other hand, this third embodiment is also based on a circuit board fixing member that is not affected by fluctuations in the position of individual battery cells accompanying expansion of battery cells or stacking of battery cells, and on this circuit board fixing member, A circuit board including a shield member and a battery state detection unit is attached. The circuit board fixing member is coupled to the restraining band. This will be specifically described below.

  FIG. 7 shows a third embodiment of the present invention. FIG. 8 shows a partial side view seen from the direction of arrow VIII in FIG. 7 and 8, the plurality of battery cells 1 are housed in the recesses of the plurality of resin members 11a on the case, and are stacked in series with the resin members 11a. The stacked battery cells 1 are restrained by restraining bands 21 (21a, 21b) and end plates 22 (22a, 22b), and a battery stack 11 is formed. Both ends of the battery stack 11 are sandwiched between a pair of end plates 22 made of metal and having high rigidity. The end plate 22 is fixed to the vehicle body and grounded.

  A highly rigid band 21 made of metal and having high rigidity joins the end plates 22 so that the mutual dimensions of the end plates 22 do not change. The restraint band 21 is grounded to the vehicle body via the end plate 22. Thereby, even if the battery cell 1 tries to expand in volume during operation, the movement is restrained. Therefore, the restraint band 21 and the end plate 22 are not affected by the dimensional variation from the battery cell 1 side.

  A circuit board fixing member 4 fixed to the battery stack 11 is provided. As shown in FIG. 8, the circuit board fixing member 4 includes a bracket part 4a and a circuit board support part 4b. A circuit board 3 including a battery state detector is attached to the circuit board fixing member 4. Between the restraint band 21, and thus the battery stack 11, and the circuit board 3, a conductive shield member 15 connected to the end plate 22 and grounded via the bracket portion 4a and the restraint band 21 is provided.

  The bracket portion 4a of the metal circuit board fixing member 4 and the shield member 15 are coupled to the restraining band 21 by a fastening member such as a bolt (not shown). The shield member 15 is made of a metal plate and is grounded via the restraining band 21 and the end plate 22. Thereby, the shield member 15 is provided between the circuit board 3 and the battery stack 11. Accordingly, electrical noise and mechanical stress from the battery stack 11 side to the circuit board 3 are blocked.

(Operational effect of the third embodiment)
According to the third embodiment, the restraint band 21 that restrains the battery cell 1 of the battery stack 11 is not subjected to dimensional variation due to expansion of the battery cell 1 and is conductive and grounded. Pay attention. The circuit board fixing member 4 and the shield member 15 are coupled to the restraining band 21.

  Therefore, the circuit board fixing member 4 is not affected by the dimensional variation accompanying the stacking of the battery stacks 11. Accordingly, by attaching the circuit board 3 to the circuit board fixing member 4 that is not subjected to mechanical stress due to the dimensional variation, no mechanical stress is applied to the circuit board 3. In addition, since the shield member 15 provided between the battery stack 11 and the circuit board 3 is provided, no electrical noise is added to the circuit board 3.

  Furthermore, a restraint band 21 that extends in the stacking direction of the battery cells 1 and restrains the battery cells 1, and an end plate 22 that is coupled to the restraint band 21 and constitutes a terminal portion of the battery stack. In the battery stack 11, the position of the stacked battery cells 1 is fixed by a restraining band 21 and an end plate 22. The circuit board fixing member 4 is coupled to the restraining band 21, and the shield member 15 is grounded via the end plate 22.

  According to this, attention is paid to the fact that the restraint band 21 that restrains the stacked battery cells 1 is not subjected to dimensional fluctuations due to expansion of the battery cells 1 and the circuit board fixing member 4 is coupled to the restraint band 21. The circuit board fixing member 4 is not affected by the dimensional variation associated with the stacking of the battery cells 1. Therefore, the mechanical stress is not applied to the circuit board 3 by attaching the circuit board 3 to the circuit board fixing member 4 that is not subjected to the mechanical stress accompanying the dimensional variation. In addition, since the shield member 15 is grounded via the end plate 22, no electrical noise is added to the circuit board 3.

  Next, the restraining band 21 includes a conductive member and is grounded via the end plate 22. The circuit board fixing member 4 and the shield member 15 are coupled to the restraining band 21, and the shield member 15 is grounded via the restraining band 21 and the end plate 22.

  According to this, attention is paid to the fact that the restraining band 21 that restrains the stacked battery cells 1 is not subjected to dimensional variation due to expansion of the battery cells 1 and is grounded. Since the circuit board fixing member 4 and the shield member 15 are coupled to the restraining band 21, the circuit board fixing member 4 is not affected by the dimensional variation associated with the stacking of the battery cells 1. Therefore, the mechanical stress is not applied to the circuit board 3 by attaching the circuit board 3 to the circuit board fixing member 4 that is not subjected to the mechanical stress accompanying the dimensional variation. In addition, since the shield member 15 is grounded via the restraining band 21, no electrical noise is added to the circuit board 3.

  The shield member 15 is made of a metal plate provided in contact with the circuit board 3, and the circuit board, the shield member 15, and the circuit board fixing member are fastened to each other by a fastener 18. According to this, the shield member 15 made of a metal plate is utilized as a reinforcing member that reinforces the circuit board 3. And the intensity | strength of the circuit board fixing member 4 increases, and the effect | action that the circuit board fixing member 4 is not influenced by the position change of the battery cell 1 can be made still more reliable. Therefore, it is possible to suppress the electrical and mechanical stress from acting on the circuit board 3, and to improve the reliability of the assembled battery.

(Other embodiments)
In the above embodiment, the preferred embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. It is. The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  The coupling portion 10 in FIG. 3 has a structure in which the claw portion is fitted into the hole portion via a clearance, but may be any structure as long as it can absorb the positional deviation between the circuit board fixing member side and the bus bar case. The coupling portion 10 may be formed of a member that can be easily elastically deformed. In the third embodiment of FIG. 8, the circuit board fixing member 4 may be a resin molded product. In this case, the ground metal plate constituting the shield member 15 is directly connected to the restraining band 21 or the end plate 22.

DESCRIPTION OF SYMBOLS 1 Battery cell 3 Circuit board containing a battery state detection part 4 Circuit board fixing member 6, 7 Electrode terminal 8 Bus bar 9 Bus bar case 10 Connection part 11 Battery stack 15 Shield member 16 Battery control part

Claims (9)

A battery stack (11) in which a plurality of battery cells (1) are connected in series and stacked;
A circuit board fixing member that is coupled to the battery stack (11) and is not affected by the fluctuation of the position of the individual battery cells (1) due to the expansion of the battery cells (1) or the stacking of the battery cells (1). 4) and
A circuit board (3) that is attached to the circuit board fixing member (4) and includes a battery state detection unit that detects a state of the battery cell (1);
A grounded conductive shield member (15),
The circuit board (3) is fixed to the circuit board fixing member (4) with the shield member (15) sandwiched between the circuit stack (11) and the circuit board (11) from the battery stack (11). The electrical noise and mechanical stress leading to 3) are cut off ,
Furthermore, a bus bar (8) connected to the electrode terminals (6, 7) of each battery cell (1) is housed, and a plurality of bus bars arranged on both the positive side and the negative side of the battery stack (11). With a case (9)
The circuit board fixing member (4) is coupled between the bus bar cases (9) on both sides,
The bus bar case (9) and the circuit board fixing member (4) are coupled by a coupling part (10) that absorbs dimensional variation between the bus bar case (9) and the circuit board fixing member (4). battery pack which is characterized Zheng Rukoto. Further, a battery control unit (16) for taking in a signal from the circuit board (3) and controlling the battery cell (1) is provided, and the battery control unit (16) is connected to the shield member (15). The assembled battery according to claim 1, wherein electrical noise from the battery stack (11) to the battery controller (16) is blocked by the shield member (15) . The battery control unit (16) includes an electronic circuit provided in a metal casing (16a), the casing (16a) is connected to the shield member (15), and the battery stack (11). The assembled battery according to claim 2, wherein electrical noise extending from the battery to the battery control unit (16) is cut off . The circuit board (3) includes one circuit board (3a) and the other circuit board (3b), and the battery control unit (16) includes one circuit board (3a) and the other circuit board (3b). The battery control unit (16) is provided between the circuit board (3b) and the battery control unit (16). The shield member (15) of both the one circuit board (3a) and the other circuit board (3b). 4. The assembled battery according to claim 2, wherein the battery pack is connected to the battery. The shield members (15) are arranged in two rows along the stacking direction of the battery cells (1) between the circuit board (3) and the battery stack (11) ,
The shield members (15a, 15b) arranged in the two rows are separated and independent from each other, and are connected to each other using the casing (16a) of the battery control unit (16) as a relay unit. The assembled battery according to claim 3 . A battery stack (11) in which a plurality of battery cells (1) are connected in series and stacked;
A circuit board fixing member that is coupled to the battery stack (11) and is not affected by the fluctuation of the position of the individual battery cells (1) due to the expansion of the battery cells (1) or the stacking of the battery cells (1). 4) and
A circuit board (3) that is attached to the circuit board fixing member (4) and includes a battery state detection unit that detects a state of the battery cell (1);
A grounded conductive shield member (15),
The circuit board (3) is fixed to the circuit board fixing member (4) with the shield member (15) sandwiched between the circuit stack (11) and the circuit board (11) from the battery stack (11). The electrical noise and mechanical stress leading to 3) are cut off,
Furthermore, the restraint band (21) that extends in the stacking direction of the battery cells (1) and restrains the battery cells (1), and the restraint band (21) are coupled to each other, and the terminal portion of the battery stack (11). An end plate (22) constituting
The battery stack (11) fixes the position of the stacked battery cells (1) with the restraining band (21) and the end plate (22),
Assembled battery the circuit board fixing member (4) is coupled to said restraining bands (21), you characterized in that said shield member (15) is grounded via the end plate (22). The restraining band (21) includes a conductive member, and is grounded via the end plate (22).
Wherein the circuit board fixing member (4) and said shield member (15) coupled to the restraint band (21), through said shield member (15) the end plate is the restraining bands (21) (22) The assembled battery according to claim 6 , wherein the battery pack is grounded. The shield member (15) is composed of a metal plate provided in contact with the circuit board (3), and the circuit board (3), the shield member (15), and the circuit board fixing member (4). The assembled battery according to any one of claims 1 to 7 , wherein the battery pack is fastened to each other by a fastener (18) . A battery stack (11) in which a plurality of battery cells (1) are connected in series and stacked;
A circuit board fixing member that is coupled to the battery stack (11) and is not affected by the fluctuation of the position of the individual battery cells (1) due to the expansion of the battery cells (1) or the stacking of the battery cells (1). 4) and
A circuit board (3) that is attached to the circuit board fixing member (4) and includes a battery state detection unit that detects a state of the battery cell (1);
A grounded conductive shield member (15),
The circuit board (3) is fixed to the circuit board fixing member (4) with the shield member (15) sandwiched between the circuit stack (11) and the circuit board (11) from the battery stack (11). The electrical noise and mechanical stress leading to 3) are cut off,
The shield member (15) is composed of a metal plate provided in contact with the circuit board (3), and the circuit board (3), the shield member (15), and the circuit board fixing member (4). An assembled battery, wherein the battery packs are fastened to each other by a fastener (18).

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