JP2020035733A - Battery module - Google Patents

Abstract

To provide a battery module capable of achieving suppression of rattling in a sensor device and excellent maintainability.SOLUTION: A battery module 1 includes: a cell laminated body 2 formed by laminating a plurality of cells 21; and a sensor device 7 for detecting a voltage of each of the cells 21. The sensor device 7 is disposed on a top face of the cell laminated body 2 and includes an isolation plate 22 provided between the adjacent cells 21. A push nut 80 with a clip part 85 is inserted into a protrusion part 221 of the isolation plate 22. At a first fixed part 731c of the sensor device 7, a hole part 731ca engaged with the clip part 85 is provided. The clip part 85 is structured to be separatable from the hole part 731ca by a compression operation.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a battery module mounted on an electric vehicle or the like.

  Conventionally, a battery module is mounted on an electric vehicle or the like. For example, Patent Literature 1 discloses a battery module including a cell stack including a plurality of cells stacked, and a sensor device that detects a voltage of each cell.

JP-A-2006-07181

  In recent years, in this type of battery module, the capacity of the battery has been increased, and the dimensional expansion due to the expansion of the cell due to a temperature change or aging cannot be ignored. For this reason, it is difficult to firmly fix the sensor device on the upper surface of the cell stack at two or more points, and there is a risk that the sensor device will rattle due to vibration during traveling of the vehicle.

  In maintenance of the sensor device, it is desired that the sensor device can be easily removed from the battery.

  The present invention provides a battery module that can suppress rattling of a sensor device and is excellent in maintainability.

The present invention
A battery module including a cell stack formed by stacking a plurality of cells, and a sensor device that detects a voltage of each cell,
The sensor device is disposed on an upper surface of the cell stack,
An insulating plate is provided between adjacent cells,
The insulating plate has a projecting portion projecting upward,
A push nut having a clip portion is inserted into the projecting portion,
The sensor device has a fixed portion,
The fixing portion is provided with a hole that engages with the clip portion,
The clip portion is configured to be detachable from the hole by a compression operation.

  According to the present invention, the sensor device is provided on the upper surface of the cell stack by engaging the hole provided in the fixing portion with the clip portion of the push nut inserted into the projecting portion of the insulating plate. Although the battery module is disposed in the sensor module, rattling of the sensor device can be suppressed. Also, during maintenance of the sensor device, the clip portion is detached from the hole by compressing the clip portion, so that the sensor device can be easily removed from the cell stack.

It is the perspective view which looked at the battery module of one embodiment of the present invention from diagonally above. FIG. 2 is an exploded perspective view of the battery module of FIG. It is a top view of the battery module of FIG. It is the perspective view which looked at the sensor apparatus of the battery module of FIG. 1 from diagonally downward. It is AA sectional drawing of FIG. It is an expansion perspective view of the 1st fixed part of a sensor device. It is BB sectional drawing of FIG. FIG. 4 is a perspective view of a protruding portion and a push nut of an insulating plate before assembly. It is explanatory drawing explaining the assembly of a push nut. It is explanatory drawing explaining the deformation | transformation of the push nut accompanying the relative movement of a sensor apparatus. FIG. 13 is a perspective view of a protruding portion and a push nut of an insulating plate before assembly according to a modified example. It is sectional drawing of the protrusion part of the insulating plate and the push nut after assembly of the modification.

  Hereinafter, embodiments of the battery module of the present invention will be described with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.

[Battery module]
As shown in FIGS. 1 to 3, the battery module 1 according to the present embodiment is configured by stacking a plurality of cells 21 in the front-rear direction, and has a cell stack having a front surface, a rear surface, a left surface, a right surface, an upper surface, and a lower surface. A body 2, a pair of end plates 3 arranged on the front and rear surfaces of the cell stack 2, a pair of side frames 4 arranged on the left and right surfaces of the cell stack 2 and connecting the pair of end plates 3; A lower plate 5 disposed on the lower surface of the cell stack 2; a sensor device 7 disposed on the upper surface of the cell stack 2 for detecting the voltage of each cell 21; And a top cover 6 that covers an area where no is mounted.

  In this specification and the like, for simplicity and clarity of description, the stacking direction of the cells 21 is defined as the front-back direction, and the direction orthogonal to the stacking direction of the cells 21 is defined as the horizontal direction (width direction) and the vertical direction (height direction). Direction), and is independent of the front-back direction of the product on which the battery module 1 is mounted. That is, when the battery module 1 is mounted on a vehicle, the stacking direction of the cells 21 may coincide with the front-back direction of the vehicle, may be the vertical direction of the vehicle, may be the left-right direction, or may be inclined from these directions. It may be a direction. In the drawing, the front of the battery module 1 is indicated by Fr, the rear is Rr, the left is L, the right is R, the upper is U, and the lower is D.

(Cell stack)
As shown in FIG. 2, the cell stack 2 is configured by alternately stacking a plurality of cells 21 and a plurality of insulating plates 22 in the front-rear direction. A plurality of bus bars 23 electrically connected to the terminals 211 of the cell 21 are arranged on the upper surface of the cell stack 2. The plurality of bus bars 23 connect the terminals 211 of the adjacent cells 21 so that the plurality of cells 21 are electrically connected in series. More specifically, the plurality of cells 21 are stacked such that the plus side terminal 211 and the minus side terminal 211 are sequentially reversed left and right, and the plurality of bus bars 23 are adjacent to the upper side in the cell stacking direction. The terminal 211 on the plus side (or minus side) of the cell 21 to be connected and the terminal 211 on the minus side (or plus side) of the cell 21 adjacent to the lower side in the cell stacking direction are sequentially connected to form a plurality of cells 21. Are electrically connected in series.

  A bus bar plate 24 that holds a plurality of bus bars 23 is provided on the upper surface of the cell stack 2. The bus bar plate 24 includes a plurality of bus bar holding portions 241. After the plurality of bus bars 23 are held in each bus bar holding portion 241, the bus bar plates 24 are placed on the upper surface of the cell stack 2. It is positioned at a predetermined position connectable to the corresponding terminal 211. Note that the bus bar plate 24 of the present embodiment is not a jig that is removed after the bus bar 23 is connected to the terminal 211, but is a component of the battery module 1 that maintains the attached state after the bus bar 23 is connected to the terminal 211. .

  It is known that the cell 21 expands due to temperature change and aging. The cell 21 has a rectangular parallelepiped shape whose length in the vertical direction is longer than the length in the front-rear direction, and whose length in the left-right direction is longer than the length in the vertical direction. Therefore, the area of the front and rear surfaces of the cell 21 is much larger than the area of the left surface, right surface, upper surface and lower surface, and the front and rear surfaces of the cell 21 easily expand at the center in the left-right direction and the center in the up-down direction. When the cell 21 expands in the front-back direction, stress acts on the bus bar 23 connecting the terminals 211 of the cell 21. The bus bar 23 of the present embodiment has a bent portion 231 that protrudes upward at an intermediate portion in the front-rear direction in order to relieve a stress acting upon expansion of the cell 21.

(end plate)
As shown in FIGS. 1 to 3, the pair of end plates 3 are arranged on the front surface and the rear surface of the cell stack 2 and receive a load in the cell stacking direction of the cell stack 2 due to the expansion of the cells 21. In the end plate 3 of the present embodiment, a plurality of fastening portions 31 that are fastened to the side frame 4 via bolts B1 are provided at both left and right ends of an outer surface that does not face the cell stack 2. On the upper surfaces of the pair of end plates 3, an external connection terminal block 32 for transmitting and receiving electric power between the battery module 1 and an external electric device is provided. A sensor fixing portion 33 to which the sensor device 7 is fixed via a bolt B2 is provided on the upper surface.

(Side frame)
As shown in FIGS. 1 to 3, the side frames 4 approach each other along the left side or right side of the cell stack 2 and along the front surface of the front end plate 3 from the front end of the side frame main body 41. A front flange portion 42 extending in the direction, a rear flange portion 43 extending from the rear end of the side frame main body 41 along the rear surface of the rear end plate 3 toward each other, and a cell laminate 2 from the upper end of the side frame main body 41. An upper flange portion 44 extending in a direction approaching each other along the upper surface of the cell stack, and a lower flange portion 45 extending from the lower end of the side frame main body 41 in a direction approaching each other along the lower surface of the cell stack 2 (lower plate 5). .

  The front flange portion 42 and the rear flange portion 43 are fastened to the front end plate 3 or the rear end plate 3 via bolts B1. Thus, the pair of end plates 3 are connected via the pair of side frames 4. When the load of the cell stack 2 in the cell stacking direction increases, the pair of side frames 4 allows relative displacement of the end plates 3 in the front-rear direction. For example, relative displacement of the end plates 3 in the front-rear direction is allowed due to deformation of the side frame body 41 in the front-rear direction, change in the angle between the side frame body 41 and the front flange portion 42 or the rear flange portion 43, or the like.

  The upper flange portion 44 and the lower flange portion 45 sandwich the cell stack 2 and the lower plate 5 from above and below at the left end and the right end of the cell stack 2. Thereby, the relative position fluctuation of the cell stack 2, the side frame 4, and the lower plate 5 in the vertical direction is suppressed, and the plurality of cells 21 constituting the cell stack 2 can be aligned.

  The upper flange portion 44 of the present embodiment is configured by a plurality of elastic pieces 44a arranged in the front-rear direction, and the number and position of the elastic pieces 44a correspond to the number and position of the cells 21 stacked in the front-rear direction. I have. Thereby, the upper flange portion 44 can elastically hold the plurality of cells 21 individually while having appropriate elasticity. Note that the lower flange portion 45 is fixed or engaged with the lower plate 5 via a holding portion (not shown).

(Lower plate)
As shown in FIGS. 1 and 2, the lower plate 5 includes a lower plate body 51 extending along the lower surfaces of the cell stack 2 and the end plate 3, and a module support structure (not shown) that supports the battery module 1. And a fastening portion (not shown) to which the lower flange portion 45 of the side frame 4 is fastened.

(Sensor device)
As shown in FIGS. 4 and 5, the sensor device 7 includes a substrate 71, an electronic component 72 mounted on the substrate 71, a case 73 for housing the substrate 71 and the electronic component 72, A voltage detection connector 74 and a detection signal output connector 75 are provided on the side surface. Note that the sensor device 7 of the present embodiment includes two voltage detection connectors 74 in order to enable voltage detection of the two battery modules 1, but the number of voltage detection connectors 74 may be one. However, there may be three or more.

  The board 71 of the present embodiment is a rectangular printed board that is long in the front-rear direction and has a printed wiring on an upper surface, and an electronic component 72, a voltage detection connector 74, and a detection signal output connector 75 are mounted on a lower surface. .

  The case 73 includes a case body 731 that covers the lower surface of the substrate 71 and a lid case 732 that covers the upper surface of the substrate 71. The case main body 731 includes a plurality (four in the present embodiment) of first fixing portions 731c and one second fixing portion 731b, and is fixed to the upper surface of the cell stack 2 via these fixing portions 731c and 731b. Is done. The specific fixing structure of the first fixing portion 731c and the second fixing portion 731b to the upper surface of the cell stack 2 will be described later.

  The voltage detection connector 74 is connected to each bus bar 23 via a plurality of voltage detection lines 9. One ends of the plurality of voltage detection lines 9 are connected to a voltage detection connector 74 of the sensor device 7 via a cable-side connector. The other ends of the plurality of voltage detection lines 9 are connected to each bus bar 23 via a space secured between the upper surface of the cell stack 2 and the lower surface of the sensor device 7.

  One end of a detection signal output line (not shown) is connected to the detection signal output connector 75. The other end of the detection signal output line is connected to a charge / discharge control unit (not shown) of the vehicle, and the voltage detection signal of each cell 21 output from the sensor device 7 is charged via the detection signal output line. Input to the discharge control unit.

(Fixed structure of sensor device)
Next, a specific fixing structure of the sensor device 7 to the cell stack 2 will be described.

  As shown in FIGS. 1 to 4, a plurality of (two) first fixing portions 731 c are provided on the left and right portions of the case body 731 at predetermined intervals in the front-rear direction. Are fixed via a push nut 80 to a plurality of insulating plates 22 which are separated in the front-rear direction.

  The push nut 80 is formed, for example, by bending a single metal plate as shown in FIG. The push nut 80 includes a flat portion 82 provided with the push nut portion 81, a pair of vertical wall portions 83 erected from the flat portion 82 and opposed in the stacking direction with the push nut portion 81 interposed therebetween, and a pair of vertical wall portions 83. A pair of flat plate portions 84 provided continuously from the upper end portion of the wall portion 83 and extending in a direction approaching each other, a clip portion 85 provided above the pair of flat plate portions 84, and an upper end portion of the pair of vertical wall portions 83 And a pair of second spring portions 87 provided continuously from the upper ends of the pair of vertical wall portions 83 and extending in the direction approaching each other. , Is provided. The pair of first spring portions 86 and the pair of second spring portions 87 are arranged so as to sandwich the pair of flat plate portions 84.

  The clip portion 85 has a substantially arrowhead shape, extends upward from the pair of flat plate portions 84, and has a pair of intermediate walls 85a facing each other with a predetermined gap therebetween, and a pair of intermediate walls 85a provided above the pair of intermediate walls 85a. A bent portion 85b, a pair of free ends 85c extending downward from the pair of bent portions 85b so as to be spaced apart from the pair of intermediate walls 85a, and a sensor device provided at the distal ends of the pair of free ends 85c. 7 and a pair of engaging portions 85d that engage with the first fixing portion 731c.

  As shown in FIGS. 7 and 8, the insulating plate 22 has a cylindrical protrusion 221 that protrudes upward. The protruding portion 221 is inserted into the push nut portion 81 of the push nut 80 from below, as shown in FIGS. As shown in FIG. 8, the push nut portion 81 has a plurality of claw portions 81 b that are inclined upward at the periphery of a circular hole 81 a formed at the center portion, and when pressed into the protruding portion 221 from above, When the plurality of claw portions 81b bite into the outer peripheral portion of the protruding portion 221, upward removal is restricted.

  The first fixing portion 731c of the sensor device 7 has a rectangular hole 731ca. As shown in FIG. 9, the first fixing portion 731c has a pair of intermediate walls 85a formed by inserting the clip portion 85 of the push nut 80 into the hole portion 731ca from below, as shown in FIGS. The pair of engaging portions 85d of the clip portion 85 engage with the holes 731ca through the holes 731ca.

  Here, as shown in FIG. 10, the distance between the pair of engaging portions 85d in the front-rear direction (stacking direction) is set to X, and the distance between the hole portions 731ca in the stacking direction is set to Y, and Y <X. In a state where the portion 85 is contracted (compressed state), the first fixing portion 731c of the sensor device 7 is elastically held between the first spring portion 86 and the second spring portion 87 and the engagement portion 85d. You.

  Therefore, even if the first fixing portion 731c of the sensor device 7 relatively moves in the stacking direction with respect to the protruding portion 221 of the insulating plate 22, the pair of intermediate walls 85a elastically incline, thereby causing relative displacement in the stacking direction. Is absorbed, and the state where the first fixing portion 731c of the sensor device 7 is held by the clip portion 85 is maintained. It should be noted that half of the difference between the distance Y of the hole 731ca and the distance X between the pair of engagement portions 85d at normal time is set to be larger than the assumed displacement Z of the cell 21 assumed due to cell expansion or the like. You.

That is, the distance X between the pair of engagement portions 85d, the distance Y of the hole 731ca, and the estimated displacement Z of the cell 21 satisfy the following expression (a).
(XY) / 2> Z (a)

  The clip portion 85 is configured to be detachable from the hole portion 731ca by a compression operation. More specifically, when the clip portion 85 is compressed to bring the pair of free ends 85c closer to each other, the pair of engagement portions 85d is disengaged from the hole 731ca, and the first spring portion 86 and the second spring The first fixing portion 731c is pushed out by the urging force of the portion 87. As described above, since the first fixing portion 731c of the sensor device 7 is held by the clip portion 85 at a portion different from the fastening by the push nut portion 81, the clip portion is compressed when the sensor device 7 is maintained. The clip portion 85 is easily detached from the hole portion 731ca by operating. Therefore, the sensor device 7 can be easily removed from the cell stack 2.

  Since the flat plate portion 84 of the push nut 80 has elasticity in the vertical direction, the clip portion 85 also has elasticity in the vertical direction. Thus, by pressing down the clip portion 85 together with the compressing operation, the engagement of the pair of engagement portions 85d with the hole portion 731ca is more easily released.

  In the battery module 1 of the present embodiment, the protruding portion 221 of the insulating plate 22 and the push nut 80 are also used as a fixing portion and a fixing tool of the bus bar plate 24. More specifically, the bus bar plate 24 has an insertion hole 242 (see FIG. 7) through which the protruding portion 221 of the insulating plate 22 is inserted, and the protruding portion 221 is inserted into the insertion hole 242 of the bus bar plate 24. In this state, the push nut 80 is inserted into the protruding portion 221. As a result, the bus bar plate 24 is vertically fixed between the insulating plate 22 and the flat portion 82 of the push nut 80.

  The above-described second fixing portion 731b is provided so as to protrude at one end in the front-rear direction (the front end in the present embodiment) of the case main body 731 and is provided with respect to the sensor fixing portion 33 provided on one of the front and rear end plates 3. , And is immovably fixed in the front-rear direction and the vertical direction via bolts B2. Thereby, the sensor device 7 is vertically fixed at one second fixing portion 731b, and the first fixing portion 731c of the sensor device 7 is connected to the first spring portion 86 and the second spring portion at the plurality of first fixing portions 731c. It is elastically held between the spring portion 87 and the engagement portion 85d. Therefore, the rattling in the vertical direction due to the vibration during traveling of the vehicle is suppressed. Further, the sensor device 7 is fixed in the front-rear direction by one second fixing portion 731b, and the pair of intermediate walls 85a is elastically inclined in the plurality of first fixing portions 731c, so that the relative displacement in the stacking direction is absorbed. Therefore, not only the rattling in the front-rear direction due to the vibration during running of the vehicle is suppressed, but also the generation of stress in the sensor device 7 due to the expansion of the cell 21 can be prevented.

Next, a modification of the present embodiment will be described with reference to FIGS.
In the above-described embodiment, the protruding portion 221 of the insulating plate 22 has a cylindrical shape protruding upward, and the push nut portion 81 is constituted by a plurality of claw portions 81b provided on the peripheral portion of the circular hole 81a. However, it is not limited to this.

  In this modification, the protruding portion 221 of the insulating plate 22 has a rectangular shape. More specifically, the protruding portion 221 has a front surface 221f and a rear surface 221r opposed in the front-rear direction (lamination direction), and a left surface 221a and a right surface 221b opposed in the left-right direction, and the front surface 221f and the rear surface 221r. A groove 221d extending in the left-right direction is formed in the groove 221d.

  The push nut portion 81 has a plurality of claw portions 81b that are inclined upward at the peripheral edge of a rectangular hole 81a formed at the center. The plurality of claw portions 81b include two pairs of claw portions 81ba facing each other in the front-rear direction (stacking direction) and a pair of claw portions 81bb facing each other in the left-right direction. Each claw portion 81ba, 81bb is connected to a first inclined portion 811 extending from the flat portion 82 in a direction approaching each other, and a second inclined portion 812 connected to the first inclined portion 811 and the bent portion 810 and extending in a direction away from each other. And

  When the push nut portion 81 of the push nut 80 is press-fitted into the projecting portion 221 from above, the bent portions 810 of the claw portions 81ba opposed in the front-rear direction (lamination direction) are provided on the front surface 221f and the rear surface 221r of the projecting portion 221. Engagement with the groove 221d restricts upward removal. Further, the upward movement of the claw portion 81bb is restricted by the engagement of the bent portion 810 of the claw portion 81bb with the left surface 221a and the right surface 221b. That is, since the bent portion 810 of the claw portion 81ba comes into contact with the groove portion 221d, the protruding portion 221 is prevented from being cut by the corner of the metal piece. Accordingly, the engagement between the push nut portion 81 of the push nut 80 and the protruding portion 221 of the insulating plate 22 is stabilized, and the sensor device 7 can be held more stably.

  The above-described embodiment can be appropriately modified, improved, and the like. For example, in the sensor device 7 of the above-described embodiment, the first fixing portion 731c and the second fixing portion 731b are provided in the case 73 that accommodates the substrate 71, and these fixing portions 731c and 731b are fixed to the cell stack 2. However, in the battery module having no case and fixing the substrate itself to the cell stack in an exposed state, holes corresponding to the first fixing portion and the second fixing portion of the embodiment are provided in the substrate itself, and these holes are formed. Can be fixed to the cell stack 2 with the same fixing structure as the first fixing portion and the second fixing portion of the embodiment.

  At least the following matters are described in this specification. In addition, although the corresponding components in the above-described embodiment are shown in parentheses, the present invention is not limited to this.

(1) A battery module including a cell stack (cell stack 2) configured by stacking a plurality of cells (cells 21) and a sensor device (sensor device 7) that detects a voltage of each cell ( A battery module 1),
The sensor device is disposed on an upper surface of the cell stack,
An insulating plate (insulating plate 22) is provided between adjacent cells,
The insulating plate has a projecting portion (projecting portion 221) projecting upward,
A push nut (push nut 80) having a clip portion (clip portion 85) is inserted into the projecting portion.
The sensor device has a fixing portion (first fixing portion 731c),
The fixing portion is provided with a hole (a hole 731ca) that engages with the clip portion,
The battery module, wherein the clip portion is configured to be detachable from the hole portion by a compression operation.

  According to (1), in the sensor device, the hole provided in the fixing portion is engaged with the clip portion of the push nut inserted into the projecting portion of the insulating plate, so that the sensor device is provided on the upper surface of the cell stack. The rattling of the sensor device can be suppressed while the battery module is provided with the device. Also, during maintenance of the sensor device, the clip portion is detached from the hole by compressing the clip portion, so that the sensor device can be easily removed from the cell stack.

(2) The battery module according to (1),
The battery module, wherein the sensor device is fixed to the projecting portions of at least two of the insulating plates separated in a stacking direction via the push nut.

  According to (2), since the sensor device is fixed via the push nut to the projecting portion of at least two insulating plates separated in the stacking direction, the rattling of the sensor device can be more reliably suppressed.

(3) The battery module according to (1) or (2),
The push nut is
A flat portion (flat portion 82) provided with a push nut portion (push nut portion 81);
A pair of vertical wall portions (vertical wall portions 83) standing upright from the flat portion and opposed in the stacking direction with the push nut portion interposed therebetween;
A pair of flat plate portions (flat plate portions 84) provided continuously from upper end portions of the pair of vertical wall portions and extending in directions approaching each other;
And the clip portion provided above the pair of flat plate portions,
The clip section,
A pair of intermediate walls (intermediate walls 85a) extending upward from the pair of flat plate portions and facing each other via a predetermined gap;
A pair of bent portions (bent portions 85b) provided on the upper portions of the pair of intermediate walls,
A pair of free ends (free ends 85c) extending downward from the pair of bent portions so as to be separated from the pair of intermediate walls;
A battery module, comprising: a pair of engaging portions (engaging portions 85d) provided at the distal ends of the pair of free ends and engaging with the fixing portion of the sensor device.

  According to (3), the pair of engaging portions provided at the distal ends of the pair of free ends engage with the fixing portion of the sensor device, so that the rattling of the sensor device can be suppressed. In addition, by performing a compression operation on the pair of free ends in a direction approaching each other, the clip portion is detached from the hole. Thereby, the sensor device can be easily removed from the cell stack.

(4) The battery module according to (3),
The length (distance Y) of the hole portion of the fixing portion in the stacking direction is shorter than the length (distance X) of the pair of engagement portions in the stacking direction,
The battery module, wherein the pair of intermediate walls has elasticity in a stacking direction.

  According to (4), since the pair of intermediate walls has elasticity in the stacking direction, displacement caused by expansion of the cell can be absorbed in a state where the pair of engagement portions are engaged with the fixing portion of the sensor device. .

(5) The battery module according to (3) or (4),
The push nut is
Further comprising at least a pair of spring portions (first spring portion 86, second spring portion 87) provided continuously from upper end portions of the pair of vertical wall portions and extending in a direction approaching each other;
A battery module, wherein the fixed portion of the sensor device is sandwiched between the pair of engagement portions and the at least one pair of spring portions.

  According to (5), since the fixing portion of the sensor device is sandwiched between the pair of engaging portions and the pair of spring portions, the fixing portion of the sensor device can be elastically held, and The rattling can be more reliably suppressed.

(6) The battery module according to any one of (3) to (5),
The battery module, wherein the pair of flat portions has elasticity in a vertical direction.

  According to (6), by pressing down the clip portion together with the compression operation, the sensor device can be more easily removed from the cell stack.

(7) The battery module according to any one of (3) to (6),
The battery module, wherein the push nut is formed from a single metal plate.

  According to (7), an increase in the number of parts can be suppressed.

(8) The battery module according to any one of (1) to (7),
The battery module includes a bus bar plate (bus bar plate 24) that holds a bus bar (bus bar 23) that connects adjacent cells.
The busbar plate has an insertion hole (insertion hole 242) through which the projecting portion of the insulating plate is inserted,
The battery module, wherein the push nut is inserted into the projecting portion while the projecting portion is inserted into the insertion hole of the bus bar plate.

  According to (8), the bus bar plate can also be fixed to the upper surface of the cell stack together with the sensor device, and a member for fixing the bus bar plate can be eliminated.

(9) The battery module according to any one of (1) to (8),
The projecting portion of the insulating plate has a substantially rectangular shape,
The projecting portion is provided with a groove (groove 221d) on a surface (a front surface 221f, a rear surface 221r) facing the stacking direction,
The push nut portion (push nut portion 81) of the push nut has at least a pair of claw portions (claw portions 81ba) facing each other in the stacking direction,
The pair of claws,
A first inclined portion (first inclined portion 811) extending in a direction approaching each other from a flat portion (flat portion 82) provided with the push nut portion;
A second inclined portion (second inclined portion 812) connected to the first inclined portion via a bent portion (bent portion 810) and extending in a direction away from each other, wherein the bent portion is engaged with the groove portion; Match, battery module.

  According to (9), the bent portion of the claw portion forming the push nut portion is engaged with the groove provided in the protruding portion of the rectangular insulating plate, so that the protruding portion is shaved by the claw portion. Is prevented. Thereby, the engagement between the push nut portion of the push nut and the projecting portion of the insulating plate is stabilized, and the sensor device can be held more stably.

REFERENCE SIGNS LIST 1 battery module 2 cell stack 21 cell 22 insulating plate 221 projecting portion 221 d groove 221 f front surface 221 r rear surface 23 bus bar 24 bus bar plate 242 insertion hole 3 end plate 7 sensor device 71 substrate 72 electronic component 73 case 731 c first fixing portion (fixing) Part)
731ca Hole portion 80 Push nut 81 Push nut portion 81ba Claw portion 810 Bend portion 811 First slope portion 812 Second slope portion 82 Flat portion 83 Vertical wall portion 84 Flat plate portion 85 Clip portion 85a Intermediate wall 85b Bend portion 85c Free end portion 85d Engaging portion 86 First spring portion (spring portion)
87 2nd spring part (spring part)

Claims (9)

A battery module including a cell stack formed by stacking a plurality of cells, and a sensor device that detects a voltage of each cell,
The sensor device is disposed on an upper surface of the cell stack,
An insulating plate is provided between adjacent cells,
The insulating plate has a projecting portion projecting upward,
A push nut having a clip portion is inserted into the projecting portion,
The sensor device has a fixed portion,
The fixing portion is provided with a hole that engages with the clip portion,
The battery module, wherein the clip portion is configured to be detachable from the hole portion by a compression operation. The battery module according to claim 1,
The battery module, wherein the sensor device is fixed to the projecting portions of at least two of the insulating plates separated in a stacking direction via the push nut. The battery module according to claim 1 or 2,
The push nut is
A flat part provided with a push nut part,
A pair of vertical wall portions which are erected from the flat portion and face each other in the stacking direction with the push nut portion interposed therebetween;
A pair of flat plate portions provided continuously from upper end portions of the pair of vertical wall portions and extending in a direction approaching each other,
And the clip portion provided above the pair of flat plate portions,
The clip section,
A pair of intermediate walls extending upward from the pair of flat plate portions and facing each other via a predetermined gap,
A pair of bent portions provided at the upper part of the pair of intermediate walls,
From the pair of bent portions, a pair of free ends extending downward and away from the pair of intermediate walls,
A battery module, comprising: a pair of engaging portions provided at distal ends of the pair of free ends and engaging with the fixing portion of the sensor device. The battery module according to claim 3, wherein
The length of the hole of the fixing portion in the stacking direction is shorter than the length of the pair of engaging portions in the stacking direction,
The battery module, wherein the pair of intermediate walls has elasticity in a stacking direction. The battery module according to claim 3, wherein:
The push nut is
It further includes at least a pair of spring portions that are provided continuously from upper end portions of the pair of vertical wall portions and extend in a direction approaching each other,
A battery module, wherein the fixed portion of the sensor device is sandwiched between the pair of engagement portions and the at least one pair of spring portions. The battery module according to claim 3, wherein:
The battery module, wherein the pair of flat portions has elasticity in a vertical direction. The battery module according to any one of claims 3 to 6, wherein
The battery module, wherein the push nut is formed from a single metal plate. The battery module according to claim 1, wherein:
The battery module includes a bus bar plate that holds a bus bar connecting the adjacent cells,
The busbar plate has an insertion hole through which the protruding portion of the insulating plate is inserted,
The battery module, wherein the push nut is inserted into the projecting portion while the projecting portion is inserted into the insertion hole of the bus bar plate. The battery module according to claim 1, wherein:
The projecting portion of the insulating plate has a substantially rectangular shape,
The protrusion is provided with a groove on a surface facing the stacking direction,
The push nut portion of the push nut has at least a pair of claw portions facing in the stacking direction,
The pair of claws,
A first inclined portion extending in a direction approaching each other from the flat portion provided with the push nut portion;
A battery module, comprising: a second inclined portion connected to the first inclined portion via a bent portion and extending in a direction away from each other, wherein the bent portion is engaged with the groove portion.

Images