JP6553284B2 - Battery module - Google Patents

Description

  Embodiments described herein relate generally to a battery module.

A battery module including a plurality of batteries and a case containing the plurality of batteries is known.
Such battery modules are desired to have improved cooling performance.

Japanese Unexamined Patent Publication No. 2014-22166 Japan JP 2015-201369 gazette

  The problem to be solved by the present invention is to provide a battery module capable of improving the cooling performance.

The battery module of the embodiment has a first battery, a second battery, a case, and a spacer. Each of the first battery and the second battery has a flat rectangular battery body and a pair of terminals provided at one end of the battery body. The battery body has a first surface with the largest area among the surfaces of the battery body, and a second surface with the area smaller than the first surface. The first battery and the second battery are arranged with the second surfaces facing each other. The case accommodates the first battery and the second battery, and has a vent hole near the second battery as compared to the first battery. The spacer is provided along the first surface of the first battery. The spacer is disposed in the first surface of the first battery so as to correspond to a region closer to the center of the first surface than the pair of terminals in a direction in which the pair of terminals are separated from each other. The spacer maintains a gap in the case where a cooling fluid flows along the surface of the first surface of the first battery. The case is opened in the case from a direction crossing the direction in which the first battery and the second battery are lined, and the second vent for the cooling fluid to flow between the first vent and the first vent. Have. At least a part of the second ventilation port is located closer to the first battery than the second battery and faces the spacer.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the battery apparatus of 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows the battery of 1st Embodiment. The side view showing the battery of a 1st embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the battery apparatus of 1st Embodiment. Sectional drawing which shows the battery apparatus of 2nd Embodiment. Sectional drawing which shows the battery apparatus of 3rd Embodiment. Sectional drawing which shows the battery apparatus of 4th Embodiment. The perspective view which shows the battery of 4th Embodiment. Sectional drawing which shows the battery apparatus of 5th Embodiment. Sectional drawing which shows the battery apparatus of 6th Embodiment. Sectional drawing which shows the battery apparatus of 7th Embodiment. Sectional drawing which shows the modification of the battery apparatus of embodiment.

  Hereinafter, the battery module of the embodiment will be described with reference to the drawings. In the following description, components having substantially the same or similar functions are denoted by the same reference numerals. And duplicate explanation of those composition may be omitted.

First Embodiment
First, a first embodiment will be described with reference to FIGS.
FIG. 1 is a perspective view showing a battery device 1 including the battery module 11 of the first embodiment.
As shown in FIG. 1, the battery device 1 of the present embodiment is a device provided with a plurality of batteries (battery cells) 21 and a cooling structure for cooling the plurality of batteries 21. The battery device 1 may be referred to as, for example, “storage battery device”, “assembled battery device”, “battery cooling device”, and the like. The battery device 1 is installed in various devices, machines, facilities, and the like, and is used as a power source for these various devices, machines, facilities, and the like. For example, the battery device 1 may be used as a mobile power source such as a power source mounted on a car, or may be used as a fixed power source such as a power source of a point of sales (POS) system. .

  As shown in FIG. 1, the battery device 1 of the present embodiment includes a battery module (battery pack) 11, an intake duct 12, and an exhaust duct 13.

First, the battery module 11 will be described in detail.
The battery module 11 of the present embodiment includes a plurality of batteries (battery cells) 21, a plurality of bus bars 22 (see FIG. 4), a substrate 23 (see FIG. 4), a battery case 24, a terminal case 25, And a plurality of spacers 26 (see FIG. 4).

  Each of the plurality of batteries 21 is, for example, a lithium ion secondary battery. Instead of this, the battery 21 may be another secondary battery such as a nickel hydrogen battery, a nickel cadmium battery, or a lead storage battery.

FIG. 2 is a perspective view showing the battery 21 of the present embodiment. FIG. 3 is a side view showing the battery 21 of the present embodiment.
As shown in FIGS. 2 and 3, each battery 21 includes a battery main body 31 and a pair of terminals 32 </ b> A and 32 </ b> B.

  The battery main body 31 has a case C that forms the outer shape of the battery main body 31. Inside the case C, the positive electrode, the negative electrode, the insulating film, the electrolyte and the like which are components of the battery 21 are accommodated. The case C is formed in a flat rectangular shape. In other words, the battery main body 31 (battery 21) is formed in a flat rectangular parallelepiped shape.

  More specifically, the battery body 31 has an upper surface 31a, a lower surface 31b, a pair of first side surfaces 31c, and a pair of second side surfaces 31d. A pair of terminals 32A and 32B is provided on the upper surface 31a. The lower surface 31b is located on the opposite side to the upper surface 31a. The pair of first side surfaces 31c and the pair of second side surfaces 31d extend in a direction substantially orthogonal to the upper surface 31a and the lower surface 31b, and connect the edge of the upper surface 31a and the edge of the lower surface 31b. In other words, the pair of first side surfaces 31c and the pair of second side surfaces 31d are side surfaces that connect the upper end portion (first end portion) of the case C and the lower end portion (second end portion) of the case C. The pair of first side surfaces 31 c are substantially parallel to each other. Each of the pair of first side surfaces 31 c is a surface having the largest area in the surface of the battery body 31. Each of the pair of first side surfaces 31c is an example of a “first surface (main surface)”. On the other hand, the pair of second side surfaces 31d extends in a direction substantially orthogonal to the first side surface 31c, and connects the edges of the pair of first side surfaces 31c. The pair of second side surfaces 31 d are substantially parallel to each other. The second side surface 31 d has a smaller area than the first side surface 31 c. Each of the pair of second side surfaces 31d is an example of a “second surface”. Further, the upper surface 31a may be referred to as a “third surface”.

  The pair of terminals 32 </ b> A and 32 </ b> B are provided at one end (upper end) of the battery main body 31. The pair of terminals 32A and 32B includes a positive terminal 32A and a negative terminal 32B. The positive terminal 32 </ b> A is electrically connected to the positive electrode in the case C. The negative terminal 32B is electrically connected to the negative electrode in the case C. The pair of terminals 32 </ b> A and 32 </ b> B are separated from each other in the longitudinal direction of the upper surface 31 a of the battery body 31.

As shown in FIG. 1, the plurality of batteries 21 are arranged substantially parallel to each other, for example, with a pair of terminals 32 </ b> A and 32 </ b> B facing in the same direction. The plurality of batteries 21 need not have the terminals 32A and 32B facing in the same direction. The plurality of batteries 21 may be arranged with the terminals 32A and 32B facing in different directions (for example, opposite directions).
In the present embodiment, the plurality of batteries 21 includes a plurality (for example, three or more) of the first batteries 21A arranged in the first row L1, and a plurality (for example, three or more) of the first batteries 21A arranged in the second row L2. 2 batteries 21B, and a plurality of (for example, three or more) third batteries 21C arranged in the third row L3.

  The first column L1 is located between the second column L2 and the third column L3. The first row L1 is an example of the “center row” sandwiched from the both sides by the other rows L2, L3. The first battery 21A is an example of a "central battery". The second row L2 is an example of a “first end row” located at one end among the plurality of rows L1, L2, and L3. The second battery 21B is an example of the “first end battery”. On the other hand, the third row L3 is an example of the “second end row” located at the other end of the plurality of rows L1, L2 and L3. The third battery 21C is an example of a "second end battery". The first battery 21A, the second battery 21B, and the third battery 21C have substantially the same shape, configuration, function, and the like.

  As shown in FIG. 1, the plurality of first batteries 21A included in the first row L1 are disposed with the first side surfaces 31c facing each other with a gap g between the first side surfaces 31c. . Similarly, the plurality of second batteries 21B included in the second row L2 are disposed with the first side surfaces 31c facing each other with a gap g between the first side surfaces 31c. The plurality of third batteries 21C included in the third row L3 are arranged with the first side surfaces 31c facing each other with a gap g between the first side surfaces 31c. The gap g formed between the plurality of first batteries 21A, the gap g formed between the plurality of second batteries 21B, and the gap g formed between the plurality of third batteries 21C are mutually different. It is connected.

  On the other hand, the plurality of first batteries 21A included in the first row L1 and the plurality of second batteries 21B included in the second row L2 have a space between each other, or an insulator is disposed between them. The second side surfaces 31d are arranged to face each other. Similarly, the plurality of first batteries 21A included in the first row L1 and the plurality of third batteries 21C included in the third row L3 have a gap between them or an insulator therebetween. The second side surfaces 31d are arranged to face each other.

  Here, the inner surface of the battery case 24 is provided with a protrusion or the like that is inserted between the plurality of batteries 21. The plurality of batteries 21 are held in a state in which a gap g is left between them by a protrusion provided on the battery case 24. Hereinafter, for convenience of explanation, the gap g formed between the plurality of batteries 21 is referred to as “ventilating gap g”. The ventilation gap g is a fluid path (fluid flow part) extending along the first side surface 31 a of the battery body 31.

  Here, the + X direction, the -X direction, the Y direction, and the Z direction are defined. The + X direction is a direction from the first row L1 toward the second row L2. The -X direction is a direction opposite to the + X direction, and is a direction from the first row L1 to the third row L3. The Y direction is a direction in which the plurality of batteries 21 are arranged with the first side surfaces 31c facing each other. The Z direction is a direction from the lower surface 31b of the battery body 31 toward the upper surface 31a. The + X direction (−X direction), the Y direction, and the Z direction intersect with each other (for example, substantially orthogonal). The upper surface 31a and the lower surface 31b of each battery 21 are surfaces along the + X direction and the Y direction. The first side surface 31c of each battery 21 is a surface along the + X direction and the Z direction. The second side surface 31d of each battery 21 is a surface along the Y direction and the Z direction.

  FIG. 4 is a cross-sectional view showing an internal configuration of the battery device 1 of the present embodiment. FIG. 4 schematically shows a state in which the second battery 21B and the third battery 21C are expanded at the end of their lives.

  As shown in FIG. 4, the plurality of bus bars 22 are connected to the terminals 32 </ b> A and 32 </ b> B of the plurality of batteries 21. The plurality of bus bars 22 are an example of the “electrical connection portion”. The plurality of bus bars 22 electrically connect the terminals 32A and 32B of the plurality of batteries 21 to each other. For example, the bus bar 22 electrically connects the positive electrode terminal 32A of a certain battery 21 and the negative electrode terminal 32B of another battery 21. Thereby, the plurality of batteries 21 are electrically connected in series or in parallel.

  The board (circuit board) 23 is, for example, a monitoring board that monitors the voltage and temperature of the battery 21. The substrate 23 may be a control substrate for controlling the charge and discharge of the battery 21 or may be a substrate having other functions.

Next, the battery case 24 will be described.
As shown in FIGS. 1 and 4, the battery case (battery box, first case) 24 is formed in a box shape in which one side is opened, and is arranged in the first row L1, the second row L2, and the third row L3. The battery bodies 31 of the plurality of included batteries 21 are integrally accommodated. The battery case 24 has a lower wall 24a, a first side wall 24b, a second side wall 24c, a third side wall 24d, and a fourth side wall 24e. The lower wall 24a is a wall along the + X direction and the Y direction. The lower wall 24 a faces the lower surfaces 31 b of the plurality of batteries 21. The four side walls 24b, 24c, 24d, 24e extend in the Z direction from the edge of the lower wall 24a. The first side wall 24b and the second side wall 24c are separated from each other in the + X direction and extend substantially parallel to each other along the Y direction. The first side wall 24b faces the second side surface 31d of the plurality of second batteries 21B included in the second row L2. The second side wall 24c is located on the opposite side of the plurality of batteries 21 from the first side wall 24b. The second side wall 24c faces the second side surface 31d of the plurality of third batteries 21C included in the third row L3. The third side wall 24d and the fourth side wall 24e are separated from each other in the Y direction and extend substantially parallel to each other along the + X direction. The third side wall 24d and the fourth side wall 24e face the first side surfaces 31c of the plurality of batteries 21 included in the first row L1, the second row L2, and the third row L3.

  As shown in FIG. 4, the lower wall 24 a of the battery case 24 has an air inlet 41 that faces the ventilation gap g. The intake port 41 allows cooling fluid (refrigerant, for example, air) to flow into the battery case 24 from the outside of the battery case 24. The air intake 41 is an example of the “second vent”. The intake port 41 is located on the opposite side to the terminal portion case 25 with respect to the plurality of batteries 21, and is opened inside the battery case 24. The intake port 41 opens in the Z direction. The intake port 41 is, for example, a rectangular slot along the + X direction. However, the shape of the intake port 41 is not limited to the above example.

In the present embodiment, the lower wall 24a of the battery case 24 has a first region 45a, a second region 45b, and a third region 45c. The first area 45a is an area in which the plurality of first batteries 21A included in the first row L1 are disposed. The second area 45b is an area in which the plurality of second batteries 21B included in the second row L2 are disposed. The third region 45c is a region in which the plurality of third batteries 21C included in the third row L3 are disposed. In the present embodiment, each of the first region 45a, the second region 45b, and the third region 45c has at least one air inlet 41. At least a part of the intake port 41 provided in the first region 45a is located closer to the first battery 21A than the second battery 21B and the third battery 21C. On the other hand, at least a part of the air inlet 41 provided in the second region 45b is located closer to the second battery 21B than the first battery 21A. Similarly, at least a part of the air inlet 41 provided in the third region 45c is located closer to the third battery 21C than the first battery 21A. The intake port 41 may be formed across at least two or more of the first area 45a, the second area 45b, and the third area 45c.
On the other hand, the lower wall 24 a of the battery case 24 does not have the air inlet 41 at a position facing the battery 21. That is, the lower surface 31 b of the battery 21 is covered with the lower wall 24 a of the battery case 24.

The first side wall 24b of the battery case 24 has a first exhaust port 42A that faces the ventilation gap g. The first exhaust port 42A allows the cooling fluid to flow out from the inside of the battery case 24 to the outside of the battery case 24. The first exhaust port 42A is an example of a “first ventilation port”. The first exhaust port 42A opens in the + X direction. That is, the first exhaust port 42 </ b> A opens into the battery case 24 from a direction different from the terminal portion case 25 and the intake port 41. The first exhaust port 42A is located closer to the second battery 21B than the first battery 21A.
Similarly, the 2nd side wall 24c of the battery case 24 has the 2nd exhaust port 42B which faces the ventilation gap g. The second exhaust port 42B allows the cooling fluid to flow out of the battery case 24 to the outside of the battery case 24. The second exhaust port 42B is open in the -X direction. The second exhaust port 42B faces the ventilation gap g from the opposite side to the first exhaust port 42A. The second exhaust port 42 </ b> B opens into the battery case 24 from a different direction from the terminal case 25 and the intake port 41. The second exhaust port 42B is located closer to the third battery 21C than the first battery 21A.

  Each of the first exhaust port 42A and the second exhaust port 42B is, for example, a rectangular slot along the Z direction. However, the shapes of the exhaust ports 42A and 42B are not limited to the above example. On the other hand, the first side wall 24b of the battery case 24 does not have the first exhaust port 42A at a position facing the second battery 21B. That is, the second side surface 31 d of the second battery 21 </ b> B is covered with the first side wall 24 b of the battery case 24. Similarly, the second side wall 24c of the battery case 24 does not have the second exhaust port 42B at a position facing the third battery 21C. That is, the second side surface 31d of the third battery 21C is covered by the second side wall 24c of the battery case 24. The other side walls 24d and 24e of the battery case 24 do not have any of the intake port 41 and the exhaust ports 42A and 42B.

Next, the terminal portion case 25 will be described.
As shown in FIG. 1, the terminal portion case 25 (terminal box, second case) is combined with the battery case 24 to close the internal space (housing portion) of the battery case 24. Specifically, the terminal case 25 is formed in a flat box shape that is thin in the Z direction. The terminal case 25 has substantially the same outer shape in the + X direction and the Y direction as the battery case 24. The terminal portion case 25 is attached to the battery case 24 from the side opposite to the lower wall 24 a of the battery case 24 and covers the internal space of the battery case 24. The terminal case 25 is connected to the battery case 24 by a coupler or an adhesive. In the present embodiment, the battery case 24 and the terminal portion case 25 are combined to form a case 29 that accommodates the plurality of batteries 21. That is, the case 29 is a member in which the battery case 24 and the terminal case 25 are viewed as a unit.

  Here, the terminal portion case 25 will be described in more detail. The terminal portion case 25 has an upper wall 25a, a first side wall 25b, a second side wall 25c, a third side wall 25d, a fourth side wall 25e, and a partition wall 25f (see FIG. 4). The upper wall 25 a faces the opposite side to the battery case 24. Four side walls 25b, 25c, 25d and 25e extend in the Z direction from the edge of the upper wall 25a. The first side wall 25b and the second side wall 25c are separated from each other in the + X direction and extend substantially parallel to each other along the Y direction. The third side wall 25d and the fourth side wall 25e are separated from each other in the Y direction and extend substantially parallel to each other along the + X direction.

  As shown in FIG. 4, the partition wall (partition plate) 25 f of the terminal portion case 25 is located at the boundary between the battery case 24 and the terminal portion case 25. The partition wall 25f is a flat wall along the + X direction and the Y direction. The partition wall 25f has a plurality of insertion holes 47 through which the terminals 32A and 32B of the plurality of batteries 21 are passed. The terminals 32A and 32B of the plurality of batteries 21 are passed through the insertion holes 47 of the partition wall 25f and exposed inside the terminal portion case 25. A plurality of bus bars 22 and a substrate 23 are accommodated in the terminal portion case 25. The terminals 32 </ b> A and 32 </ b> B of the plurality of batteries 21 are electrically connected by a plurality of bus bars 22 accommodated in the terminal portion case 25.

  On the other hand, the partition wall 25f does not have a hole at a position facing the ventilation gap g. The partition wall 25 f faces a plurality of ventilation gaps g formed between the plurality of batteries 21 and integrally covers the plurality of ventilation gaps g. That is, the partition wall 25 f covers the plurality of ventilation gaps g from one side. In other words, the plurality of ventilation gaps g are closed in the Z direction by the partition wall 25f.

Next, the spacer 26 will be described.
As shown in FIG. 4, the plurality of spacers 26 are provided along the first side surfaces 31 c of the plurality of first batteries 21 </ b> A arranged in the first row L <b> 1 inside the battery case 24. In other words, the spacer 26 is disposed in the ventilation gap g along the first side surface 31c of the first battery 21A. The spacer 26 faces the air inlet 41 provided in the first region 45 a of the lower wall 24 a.

  More specifically, at least one spacer 26 included in the plurality of spacers 26 is disposed between the plurality of first batteries 21A. That is, the spacer 26 is disposed in the ventilation gap g formed between the first side surfaces 31c of the plurality of first batteries 21A. Further, at least one other spacer 26 included in the plurality of spacers 26 is disposed between the first battery 21A and the inner surface of the battery case 24. That is, the spacer 26 is disposed in the ventilation gap g formed between the first side surface 31 c of the first battery 21 A and the inner surface of the battery case 24.

  For example, when the first battery 21A is to expand, the spacer 26 may be provided between the first side surfaces 31c of the plurality of first batteries 21A, or between the first side surface 31c of the first battery 21A and the inner surface of the battery case 24. The expansion of the first battery 21A is suppressed by being sandwiched therebetween. Thereby, the spacer 26 maintains the ventilation gap g through which the cooling fluid flows along the surface of the first side surface 31c of the first battery 21A inside the case 29 (battery case 24). The spacer 26 is made of, for example, a synthetic resin, has rigidity to maintain a certain thickness even when sandwiched between a plurality of members, and has insulation (electrical insulation). The spacer 26 need not be fixed to the first side surface 31c of the first battery 21A or the inner surface of the battery case 24. Furthermore, the spacer 26 may not be in contact with the first side surface 31c of the first battery 21A or the inner surface of the battery case 24 in a state where the first battery 21A is not expanded.

  As shown in FIG. 4, each of the plurality of spacers 26 is a pair of terminals 32A, 32B in the direction (+ X direction) in which the pair of terminals 32A, 32B are separated in the first side surface 31c of the first battery 21A. It is arrange | positioned corresponding to the area | region S nearer to the center part of the 1st side 31c rather than. In the present application, “the region closer to the center of the first side surface than the pair of terminals in the direction in which the pair of terminals are separated from each other” (the + X direction) means the region S and the pair of terminals 32A and 32B in the + X direction. Does not mean that they overlap, but means the region S (the hatched region in FIG. 3) located inside the pair of terminals 32A and 32B at the position in the X direction. Further, “arranged corresponding to the region S” means that at least a part of the spacer 26 faces the region S.

  Further, in the present embodiment, the spacer 26 is provided at a position away from the terminal portion case 25. Thus, a gap through which the cooling fluid passes is formed between the spacer 26 and the terminal portion case 25. Similarly, the spacer 26 is provided at a position away from the lower wall 24 a of the battery case 24. Thus, a gap through which the cooling fluid passes is formed between the spacer 26 and the lower wall 24 a of the battery case 24. Moreover, the spacer 26 is provided in the position away from the 2nd battery 21B and the 3rd battery 21C. Thus, a gap through which the cooling fluid passes is formed between the spacer 26 and the second battery 21B and between the spacer 26 and the third battery 21C.

  In the present embodiment, each spacer 26 is formed of a plurality of (for example, three or more) spacer members (spacing pieces) 51. The plurality of spacer members 51 are spaced apart from each other in the direction in which the first battery 21A and the second battery 21B are aligned (that is, the direction from the first battery 21A toward the second battery 21B, + X direction). At least a part of each spacer member 51 extends in a straight line along a direction intersecting the direction (+ X direction) in which the first battery 21A and the second battery 21B are arranged. In the present embodiment, at least a part of each spacer member 51 extends in a straight line along the direction (Z direction) from the intake port 41 toward the terminal portion case 25. Thereby, the spacer 26 forms a flow path through which the cooling fluid flows from the air inlet 41 toward the terminal case 25. In the present embodiment, at least a portion of the plurality of spacer members 51 extend substantially in parallel with each other. In the present embodiment, each spacer member 51 extends in the Z direction over the entire length of the spacer member 51. For example, each spacer member 51 is a prismatic member extending in the Z direction.

  On the other hand, no spacer is provided in the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C. From another point of view, the second battery 21B and the third battery 21C are placed on the first side surface 31c of the second battery 21B and the third battery 21C when the second battery 21B and the third battery 21C are about to expand. It is allowed to expand so that the ventilation gap g along is narrow. In other words, when the second battery 21B and the third battery 21C expand, the first side surfaces 31c of the second battery 21B and the third battery 21C form a swelling portion E that bulges in a convex shape.

Next, the intake duct 12 and the exhaust duct 13 will be described.
As shown in FIG. 4, at least a part of the intake duct 12 overlaps the lower wall 24a of the battery case 24 in the Z direction. The intake duct 12 communicates with the inside of the battery case 24 through the intake port 41 of the lower wall 24a of the battery case 24. The intake duct 12 supplies the cooling fluid passing through the inside of the intake duct 12 to the inside of the battery case 24 from the intake port 41 of the battery case 24.

  The exhaust duct 13 has, for example, a first exhaust flow path (first ventilation flow path) 13 a and a second exhaust flow path (second ventilation flow path) 13 b. The first exhaust passage 13a overlaps the first side wall 24b of the battery case 24 in the −X direction. The first exhaust flow passage 13 a communicates with the inside of the battery case 24 through the first exhaust port 42 A of the battery case 24. A part of the cooling fluid that has passed through the inside of the battery case 24 flows into the first exhaust passage 13a from the first exhaust port 42A of the battery case 24. On the other hand, the second exhaust flow passage 13b overlaps the second side wall 24c of the battery case 24 in the + X direction. The second exhaust flow passage 13 b communicates with the inside of the battery case 24 through the second exhaust port 42 B of the battery case 24. Another part of the cooling fluid that has passed through the inside of the battery case 24 flows into the second exhaust passage 13b from the second exhaust port 42B of the battery case 24. The first exhaust flow path 13 a and the second exhaust flow path 13 b guide the cooling fluid that has flowed into the first exhaust flow path 13 a and the second exhaust flow path 13 b toward the outside of the battery module 11.

Next, the operation of the battery device 1 will be described.
When the battery 21 is charged or discharged, a cooling fluid is supplied to the intake duct 12. The cooling fluid supplied to the intake duct 12 flows into the ventilation gap g between the plurality of batteries 21 from the intake port 41 of the battery case 24. The cooling fluid that has flowed into the ventilation gap g directly contacts the first side surface 31 c of the battery 21 in the process of passing through the ventilation gap g and takes heat away from the battery 21. Thereby, the cooling of the battery 21 is promoted. The cooling fluid that has passed through the ventilation gap g flows from the first exhaust port 42A and the second exhaust port 42B of the battery case 24 into the first exhaust channel 13a and the second exhaust channel 13b. The cooling fluid that has flowed into the first exhaust flow path 13 a and the second exhaust flow path 13 b flows toward the outside of the battery module 11.

  Here, as shown in FIG. 4, for example, at the end of the life of the battery 21, the battery 21 expands due to the gas generated inside the battery 21, and the first side surface 31 c of the battery 21 expands in a drum shape (convex shape). In the present embodiment, the first side surface 31c of the second battery 21B and the third battery 21C arranged in a state where expansion is allowed swell. Then, due to the expansion, the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C is narrowed by the swelling portion E formed on the first side surface 31c of the second battery 21B and the third battery 21C.

  On the other hand, a spacer 26 is provided in the ventilation gap g along the first side surface 31c of the first battery 21A. Therefore, even if the first side surface 31c of the first battery 21A tries to expand, the expansion of the first side surface 31c of the first battery 21A is limited by the spacer 26. That is, the ventilation gap g along the first side surface 31 c of the first battery 21 </ b> A is maintained by the spacer 26. For this reason, a part of the cooling fluid which has flowed into the inside of the battery case 24 from the intake port 41 flows along the first side surface 31c of the first battery 21A. The cooling fluid having flowed along the first side surface 31c of the first battery 21A is a gap between the swelling portion E of the second battery 21B and the terminal portion case 25 or the swelling portion E of the third battery 21C and the terminal The air is exhausted from the first exhaust port 42A and the second exhaust port 42B to the outside of the battery case 24 through a gap between the battery case 25 and the like.

  According to the battery module 11 having such a configuration, the cooling performance can be enhanced. That is, for example, at the end of the life of the battery 21, the battery 21 may expand and the first side surface 31c may expand in a drum shape. In this case, the ventilation gap g facing the first side surface 31 c of the battery 21 is narrowed. In some cases, the ventilation gap g is closed at the central portion of the first side surface 31 c of the battery 21. In these cases, the flow passage cross-sectional area decreases around the battery 21, and the ventilation resistance increases. Therefore, in the battery case 24, the flow of the cooling fluid passing around the second battery 21B and the third battery 21C (for example, from the intake port 41 of the second region 45b and the third region 45c to the second battery 21B and the 3) The short circuit flow toward the exhaust ports 42A and 42B passing through the vicinity of the end of the battery 21C and the flow of the arrow F in FIG. 4) increases, and the cooling fluid hardly flows around the first battery 21A. As a result, the temperature of the first battery 21A is greatly increased compared to the second battery 21B and the third battery 21C, and the cooling performance of the battery module 11 is decreased. The "cooling performance" referred to in the present application is an index evaluated based on the thermal resistance (K / W) obtained by dividing the maximum temperature (K) of the battery 21 by the calorific value (W) of the battery 21. is there. That is, at the end of the life of the battery 21, the thermal resistance of the battery module 11 increases, so the cooling performance is reduced.

  Therefore, the battery module 11 of the present embodiment is provided along the first side surface 31c of the first battery 21A, and the gap g through which the cooling fluid flows along the surface of the first side surface 31c of the first battery 21A A spacer 26 is provided. According to such a configuration, the ventilation gap g along the first side surface 31c of the first battery 21A is maintained by the spacer 26 even when the first battery 21A is about to expand. For this reason, it is possible to suppress the decrease in the flow passage cross-sectional area around the first battery 21A, and it is possible to suppress the decrease in the cooling fluid going to the periphery of the first battery 21A. As a result, the temperature of the first battery 21A can be prevented from rising significantly as compared to the second battery 21B, and the cooling performance of the battery module 11 can be improved.

  In the present embodiment, the spacer 26 is a region closer to the central portion of the first side surface 31c than the pair of terminals 32A and 32B in the direction in which the pair of terminals 32A and 32B are separated in the first side surface 31c of the first battery 21A. S is arranged corresponding to S. According to such a configuration, the central portion of the first side surface 31 c to be deformed in a drum shape (convex shape) can be reliably pressed by the spacer 26. Thereby, the ventilation gap g along the first side surface 31c of the first battery 21A can be maintained more reliably.

  In the present embodiment, the case 29 has an intake port 41 that opens into the case 29 from a direction that intersects the direction in which the first battery 21A and the second battery 21B are arranged. The cooling fluid flows between the intake port 41 and the exhaust ports 42A and 42B. At least a portion of the intake port 41 is closer to the first battery 21A than the second battery 21B and faces the spacer 26. According to such a configuration, the cooling fluid can be supplied more smoothly around the first battery 21A. Thereby, the cooling performance of the battery module 11 can be further improved.

  In the present embodiment, at least a part of the spacer 26 extends in a direction crossing the direction in which the first battery 21A and the second battery 21B are arranged. According to such a configuration, the cooling fluid can be guided more smoothly in a direction different from that of the second battery 21B in which the bulge portion E is formed. Thereby, the amount of cooling fluid going to the periphery of the first battery 21A can be further increased.

In the present embodiment, the spacer 26 is disposed between the plurality of first batteries 21A. According to such a configuration, the ventilation gap g formed between the plurality of first batteries 21 </ b> A can be maintained by the spacer 26.
In the present embodiment, the spacer 26 is disposed between the first battery 21 </ b> A and the inner surface of the battery case 24. According to such a configuration, the ventilation gap g formed between the first battery 21A and the inner surface of the battery case 24 can be maintained by the spacer 26.

  In the present embodiment, the spacer 26 includes a plurality of spacer members 51 spaced apart from one another. According to such a configuration, the flow path in which the cooling fluid flows between the plurality of spacer members 51 can be reliably maintained. Further, when the plurality of spacer members 51 are separated from each other in the direction in which the first battery 21A and the second battery 21B are arranged, the cooling fluid is directed in a direction different from the second battery 21B in which the bulge portion E is formed. Can be guided more smoothly. Thereby, the quantity of the cooling fluid which goes to the circumference | surroundings of the 1st battery 21A can be increased further.

  In the present embodiment, each of the plurality of spacer members 51 extends at least partially along a direction intersecting the direction in which the first battery 21A and the second battery 21B are arranged. According to such a configuration, the cooling fluid can be more smoothly introduced in a direction different from that of the second battery 21B in which the bulge portion E is formed.

  In the present embodiment, no spacer is provided in the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C. From another viewpoint, when the first battery 21A, the second battery 21B, and the third battery 21C are to expand, the ventilation gap g along the first side surface 31c of the first battery 21A is maintained by the spacer 26. On the other hand, the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C is narrowed by the expansion of the second battery 21B and the third battery 21C. According to such a configuration, when the second battery 21B and the third battery 21C expand and the ventilation resistance in the battery case 24 increases, the second battery 21B and the third battery 21C follow the first side surface 31c of the third battery 21C. By deliberately reducing the ventilation gap g, it is possible to flow a relatively larger amount of cooling fluid toward the first battery 21A. When the second battery 21B and the third battery 21C expand to increase the airflow resistance in the battery case 24, for example, from the air inlet 41 through the vicinity of the ends of the second battery 21B and the third battery 21C. Since the short circuit flow toward the exhaust ports 42A and 42B (the flow of the arrow F in FIG. 4) increases, the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C becomes narrow. The heat dissipation of the second battery 21B and the third battery 21C can be sufficiently ensured. Thereby, the cooling performance as the whole of the battery module 11 can be improved.

Second Embodiment
Next, a second embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that a plurality of spacer members 51 are arranged radially. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment.

  As shown in FIG. 5, the plurality of spacer members 51 are radially arranged such that the distance between the plurality of spacer members 51 increases as the distance from the air inlet 41 increases. At least one spacer member 51 included in the plurality of spacer members 51 is inclined in the direction approaching the first exhaust port 42A as it proceeds in the direction away from the intake port 41 in the Z direction. On the other hand, at least one other spacer member 51 included in the plurality of spacer members 51 is inclined in the direction approaching the second exhaust port 42B as it proceeds in the direction away from the intake port 41 with respect to the Z direction. .

  According to such a configuration, as in the first embodiment, the cooling performance of the battery module 11 can be improved. Further, in the present embodiment, since the plurality of spacer members 51 are radially arranged, the ventilation resistance around the first battery 21A is further reduced. Therefore, the amount of the cooling fluid directed to the periphery of the first battery 21A can be further increased, and the cooling performance of the battery module 11 can be further improved.

  In addition, when the spacer member 51 is inclined toward the first exhaust port 42A or the second exhaust port 42B, the cooling fluid that flows along the first side surface 31c of the first battery 21A from the intake port 41 flows. It can flow more smoothly toward 42A or the second exhaust port 42B. Therefore, the amount of the cooling fluid directed to the periphery of the first battery 21A can be further increased, and the cooling performance of the battery module 11 can be further improved.

Third Embodiment
Next, a third embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that each of the plurality of spacer members 51 has a bent shape. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment.

  As shown in FIG. 6, each of the plurality of spacer members 51 has a first portion 51 a and a second portion 51 b. The first portion 51a extends linearly along the direction (Z direction) intersecting the direction in which the first battery 21A and the second battery 21B are arranged. On the other hand, the second portion 51b is bent from the downstream end of the first portion 51a in the flow direction of the wind, and linearly extends along the direction intersecting the first portion 51a. For example, the plurality of spacer members 51 include a first spacer member 51A and a second spacer member 51B. The second portion 51b of the first spacer member 51A is bent and extended in the direction approaching the first exhaust port 42A from the end of the first portion 51a of the first spacer member 51A. On the other hand, the second portion 51b of the second spacer member 51B is bent and extended from the end of the first portion 51a of the second spacer member 51B in a direction approaching the second exhaust port 42B.

  According to such a configuration, the cooling performance of the battery module 11 can be improved as in the first embodiment. Further, in the present embodiment, the spacer 26 (for example, the first spacer member 51A) extends in a direction intersecting the direction in which the first battery 21A and the second battery 21B are arranged, and the first portion 51a. And a second portion 51b bent and extended in a direction approaching the first exhaust port 42A from the end. According to such a configuration, the flow along the spacer 26 is less likely to bend substantially at right angles toward the first exhaust port 42A, and the ventilation resistance around the first battery 21A can be reduced. Thereby, the cooling performance of the battery module 11 can be further improved.

  Further, as described above, when the spacer 26 (for example, the first spacer member 51A) has the first portion 51a and the second portion 51b bent with respect to the first portion 51a, for example, the first battery 21A When the operation of attaching the spacer 26 to the side surface 31c is performed, the posture of the spacer 26 is stabilized with respect to the first side surface 31c of the first battery 21A (for example, it is difficult to fall down). For this reason, the battery module 11 with favorable assembly workability can be provided.

Fourth Embodiment
Next, a fourth embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in that the second battery 21 </ b> B and the third battery 21 </ b> C have an insulating film 61. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment.

FIG. 7 is a cross-sectional view showing the battery device 1 of the present embodiment. FIG. 8 is a perspective view showing a battery 21 of the present embodiment.
As shown in FIG. 8, in the present embodiment, the second battery 21B and the third battery 21C have an insulating film 61 covering at least the first side surface 31c. For example, the battery bodies 31 of the second battery 21B and the third battery 21C are inserted inside the bag-shaped insulating film 61. Then, the insulating film 61 is shrunk due to the heat treatment, and adheres to the surfaces of the battery bodies 31 of the second battery 21B and the third battery 21C. Thereby, the battery main body 31 of the second battery 21B and the third battery 21C is wound by the insulating film 61. Note that the first battery 21A may or may not have the insulating film 61.

  According to such a configuration, the cooling performance of the battery module 11 can be improved as in the first embodiment. Here, the plurality of batteries 21 adjacent to each other may have different surface potentials. Therefore, in the present embodiment, each of the second battery 21B and the third battery 21C has an insulating film 61 that covers the first side surface 31c. According to such a configuration, even if the second battery 21B and the third battery 21C expand and the first side surface 31c of the second battery 21B and the third battery 21C contacts the adjacent battery 21, a short circuit occurs. Does not occur. Therefore, the reliability of the battery module 11 is enhanced. The insulating film 61 is, for example, several tens of μm thick. Therefore, even when the surfaces of the second battery 21B and the third battery 21C are covered by the insulating film 61, the second battery 21B and the third battery 21C can sufficiently dissipate heat through the insulating film 61.

Fifth Embodiment
Next, a fifth embodiment will be described with reference to FIG. The present embodiment is different from the first embodiment in that the battery module 11 has a plurality of insulating plates 65. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment.

  As shown in FIG. 9, in this embodiment, the battery module 11 has a plurality of insulating plates 65. The insulating plate 65 is disposed along the first side surface 31c of the second battery 21B or the third battery 21C. That is, the insulating plate 65 is disposed between the first side surfaces 31c of the plurality of second batteries 21B and between the first side surfaces 31c of the plurality of third batteries 21C. The insulating plate 65 faces the central portion of the first side surface 31c of the second battery 21B or the third battery 21C. The insulating plate 65 is thinner than the width in the Y direction of the ventilation gap g facing the first side surface 31c of the second battery 21B and the third battery 21C. For this reason, at the time of normal use of the battery module 11, the insulating plate 65 does not block the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C.

  According to such a configuration, the cooling performance of the battery module 11 can be improved as in the first embodiment. In the present embodiment, the battery module 11 has an insulating plate 65 disposed along the first side surface 31c of the second battery 21B or the third battery 21C. According to such a configuration, even if the second battery 21B and the third battery 21C expand and the first side surface 31c of the second battery 21B and the third battery 21C tries to contact the adjacent battery 21. Short circuit does not occur. Therefore, the reliability of the battery module 11 is enhanced. The insulating plate 65 has a thickness of about 0.3 mm to 0.5 mm, for example. For this reason, the second battery 21 B and the third battery 21 C can sufficiently dissipate heat through the insulating plate 65 even in the state where the surfaces are covered by the insulating plate 65.

(Sixth embodiment)
Next, a sixth embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that a plurality of batteries 21 are arranged in two rows. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment.

  As shown in FIG. 10, in the present embodiment, the plurality of batteries 21 includes a plurality of first batteries 21A arranged in the first row L1 and a plurality of second batteries 21B arranged in the second row L2. Including. The exhaust port 42A and the exhaust duct 13 are provided only on one side with respect to the plurality of batteries 21. In the present embodiment, the exhaust port 42A and the exhaust duct 13 are closer to the second battery 21B than the first battery 21A.

  According to such a configuration, the cooling performance of the battery module 11 can be improved as in the first embodiment.

Seventh Embodiment
Next, a seventh embodiment will be described with reference to FIG. This embodiment is different from the first embodiment in that a plurality of batteries 21 are arranged in four rows. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment.

  As shown in FIG. 11, in the present embodiment, the plurality of batteries 21 includes a plurality of first batteries 21A arranged in the first center row CL1 and a plurality of first batteries 21A arranged in the second center row CL2. And a plurality of second batteries 21B disposed in the first end row EL1 and a plurality of third batteries 21C disposed in the second end row EL2. The first exhaust port 42A and the first exhaust flow path 13a are closer to the second battery 21B than the first battery 21A. The second exhaust port 42B and the second exhaust flow path 13b are closer to the third battery 21C than the first battery 21A. The spacer 26 is provided along the first side surface 31c of the first battery 21A included in the first center row CL1 and the second center row CL2.

  According to such a configuration, as in the first embodiment, the cooling performance of the battery module 11 can be improved.

(Modification of the embodiment)
Next, with reference to FIG. 12, the modification of the battery module 11 of embodiment is demonstrated. This modification is applicable to any of the first to seventh embodiments, for example. In FIG. 12, an example applied to the configuration of the first embodiment will be described.

  As shown in FIG. 12, the battery module 11 includes a plurality of first spacers 26 and a plurality of second spacers 71. The first spacer 26 is provided along the first side surface 31c of the first battery 21A. On the other hand, the second spacer 71 is provided along the first side surface 31c of the second battery 21B or the second side surface 31d of the third battery 21C. The second spacer 71 is thinner in the Y direction than the first spacer 26.

  According to such a configuration, the cooling performance of the battery module 11 can be improved as in the first embodiment. Further, in the present embodiment, a second spacer 71 thinner than the first spacer 26 is provided in the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C. According to such a configuration, when the first battery 21A, the second battery 21B, and the third battery 21C are to expand, the ventilation gap g along the first side surface 31c of the first battery 21A is the first spacer 26. On the other hand, the ventilation gap g along the first side surface 31c of the second battery 21B and the third battery 21C becomes narrow due to the expansion of the second battery 21B and the third battery 21C. Thus, as in the first embodiment, more cooling fluid can be flowed toward the first battery 21A. Thereby, the cooling performance as the whole of the battery module 11 can be improved.

  As mentioned above, although the battery module 11 which concerns on some embodiment and modification was demonstrated, the structure of embodiment is not limited to the said example. For example, the configurations of the above-described first to seventh embodiments may be applied in combination with each other. In the configuration of the above-described embodiment, the flow direction of the intake / exhaust may be reversed. That is, the first ventilation port provided in the side wall 24b of the battery case 24 may be an intake port, and the second ventilation port provided in the lower wall 24a of the battery case 24 may be an exhaust port. For example, the spacer 26 may be provided in the gap g along the second battery 21B or the third battery 21C in addition to the gap g along the first battery 21A. Lower wall 24a of the battery case 24, first to fourth side walls 24b, 24c, 24d, 24e, upper wall 25a of the terminal portion case 25, first to fourth side walls 25b, 25c, 25d, 25e, and a partition wall The name 25f is given for convenience of explanation. For this reason, these walls may be called "first wall", "second wall", "third wall", ... etc. in any order.

  According to at least one embodiment described above, the battery module includes a first battery, a second battery, a case, and a spacer. The case accommodates the first battery and the second battery, and has a vent hole near the second battery as compared to the first battery. The spacer is provided along the first battery, and maintains a gap in which the cooling fluid flows along the surface of the first battery in the case. According to such a configuration, the cooling performance of the battery module can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in other various forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

  11 battery module 21 battery 21 A first battery 21 B second battery 26 spacer 29 case 31 body of battery 31 c first side (first surface) 31 d second side (2nd surface), 32A, 32B: terminal, 41: inlet (second vent), 42A: first outlet (first vent), 51: spacer member, 51a: first portion of spacer, 51b: second portion of spacer member, 61: insulating film, 65: insulating plate, g: ventilation gap (gap).

Claims (13)

The battery body has a flat rectangular parallelepiped shape and a pair of terminals provided at one end of the battery body, and the battery body has a first surface having the largest area among the surfaces of the battery body, A first battery and a second battery having a second surface smaller in area than the first surface, and disposed with the second surfaces facing each other;
A case that houses the first battery and the second battery, and has a first vent near the second battery as compared to the first battery;
It is provided along the first surface of the first battery, and in the central portion of the first surface of the pair of terminals in the direction in which the pair of terminals are separated in the first surface of the first battery. A spacer disposed corresponding to the near region and keeping a gap through which the cooling fluid flows along the surface of the first surface of the first battery inside the case;
Equipped with a,
The case is opened in the case from a direction crossing the direction in which the first battery and the second battery are lined, and the second vent for the cooling fluid to flow between the first vent and the first vent. And at least a part of the second ventilation port is located closer to the first battery than the second battery and faces the spacer.
Battery module. The second vent is an inlet for introducing the cooling fluid into the case, and the first vent is an outlet for causing the cooling fluid to flow out of the case.
The battery module according to claim 1 . At least a part of the spacer extends in a direction intersecting the direction in which the first battery and the second battery are arranged.
The battery module according to claim 1. In addition to including the first battery, further comprising a plurality of batteries arranged with the first surface facing each other with the gap between the first surfaces,
The spacer is disposed between the plurality of batteries
The battery module according to claim 1. The spacer is disposed between the first battery and the inner surface of the case.
The battery module according to claim 1. The spacer has a plurality of spacer members arranged apart from each other in the direction in which the first battery and the second battery are arranged.
The battery module according to claim 1. Each of the plurality of spacer members extends at least partially in a direction intersecting with the direction in which the first battery and the second battery are arranged.
The battery module according to claim 6 . The battery body has a flat rectangular parallelepiped shape and a pair of terminals provided at one end of the battery body, and the battery body has a first surface having the largest area among the surfaces of the battery body, A first battery and a second battery having a second surface smaller in area than the first surface, and disposed with the second surfaces facing each other;
A case that houses the first battery and the second battery, and has a first vent near the second battery as compared to the first battery;
It is provided along the first surface of the first battery, and in the central portion of the first surface of the pair of terminals in the direction in which the pair of terminals are separated in the first surface of the first battery. A spacer disposed corresponding to the near region and keeping a gap through which the cooling fluid flows along the surface of the first surface of the first battery inside the case;
With
The case has a second ventilation opening that opens into the case from a direction different from the first ventilation opening and faces the spacer,
The spacer has a plurality of spacer members arranged apart from each other in the direction in which the first battery and the second battery are arranged.
The plurality of spacer members are arranged radially so that the distance between them increases as the distance from the second ventilation port increases.
Batteries module. The battery body has a flat rectangular parallelepiped shape and a pair of terminals provided at one end of the battery body, and the battery body has a first surface having the largest area among the surfaces of the battery body, A first battery and a second battery having a second surface smaller in area than the first surface, and disposed with the second surfaces facing each other;
A case that houses the first battery and the second battery, and has a first vent near the second battery as compared to the first battery;
The first battery is provided along the first surface of the first battery, and is closer to the center of the first surface than the pair of terminals in a direction in which the pair of terminals are separated from each other in the first surface of the first battery. A spacer disposed corresponding to the near region and keeping a gap through which the cooling fluid flows along the surface of the first surface of the first battery inside the case;
With
The case has a second ventilation opening that opens into the case from a direction different from the first ventilation opening and faces the spacer,
The spacer extends in a direction that crosses the direction in which the first battery and the second battery are arranged, and bends and extends in a direction approaching the first ventilation port from an end of the first portion. Including a second part,
Batteries module. The second battery has an insulating film covering the first surface of the second battery;
The battery module according to claim 1. An insulating plate disposed along the first surface of the second battery;
The battery module according to claim 1. The battery body has a flat rectangular battery body and a pair of terminals provided at one end of the battery body, and the battery body has a first surface with the largest area among the surfaces of the battery body, A first battery and a second battery having a second surface smaller in area than the first surface, and disposed with the second surfaces facing each other;
A case accommodating the first battery and the second battery, and having a first vent near the second battery compared to the first battery;
It is provided along the first surface of the first battery, and in the central portion of the first surface of the pair of terminals in the direction in which the pair of terminals are separated in the first surface of the first battery. A spacer disposed corresponding to the near region and keeping a gap through which the cooling fluid flows along the surface of the first surface of the first battery inside the case;
With
In the gap along the first surface of the second battery, a spacer is not provided, or a spacer thinner than the spacer along the first surface of the first battery is provided.
Batteries module. The battery body has a flat rectangular parallelepiped shape and a pair of terminals provided at one end of the battery body, and the battery body has a first surface having the largest area among the surfaces of the battery body, A first battery and a second battery having a second surface smaller in area than the first surface, and disposed with the second surfaces facing each other;
A case that houses the first battery and the second battery, and has a first vent near the second battery as compared to the first battery;
It is provided along the first surface of the first battery, and in the central portion of the first surface of the pair of terminals in the direction in which the pair of terminals are separated in the first surface of the first battery. A spacer disposed corresponding to the near region and keeping a gap through which the cooling fluid flows along the surface of the first surface of the first battery inside the case;
With
When the first battery and the second battery are about to expand, the gap along the first surface of the first battery is maintained by the spacer, and the gap along the first surface of the second battery. Is narrowed by the expansion of the second battery,
Batteries module.

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