JP6999238B2 - Battery module and assembled battery - Google Patents

Description

The present invention relates to a battery module and an assembled battery.

Conventionally, a rechargeable battery module having a plurality of battery cells is known. For example, Patent Document 1 discloses a battery module in which a plurality of battery cells are arranged inside a combined upper frame and lower frame.

Japanese Patent No. 5154454

In such a battery module, heat generated by charging / discharging the stacked battery cells tends to be trapped in the laminated body. When the amount of heat generated becomes large, it becomes necessary to suppress the use of the battery module, and the life of the battery module is shortened. In the invention described in Patent Document 1, the battery cell in the cell cover is cooled by flowing a cooling agent such as air in the horizontal direction and the vertical direction of the cell cover. However, such a method does not have sufficient heat dissipation, and a method for more efficiently dissipating heat generated from the battery cell is required.

An object of the present invention made in view of such a problem is to provide a battery module capable of efficiently dissipating heat from stacked battery cells.

In order to solve the above problems, the battery module according to the embodiment of the present invention is
With multiple stacked battery cells,
A cell case that internally supports the plurality of battery cells, and a cell case.
In the plurality of battery cells, a heat sink sandwiched between the battery cells and
Equipped with
The heat sink protrudes from the cell case and is wider than the battery cell along the protruding direction.

According to the battery module according to the embodiment of the present invention, heat can be efficiently dissipated from the stacked battery cells.

It is an exploded perspective view which shows the structural example of the assembled battery which concerns on 1st Embodiment. It is external perspective view which shows the structural example of the assembled battery which concerns on 1st Embodiment. It is a top view of a battery cell. It is a side view of a battery cell. It is an exploded perspective view which shows the structural example of a battery module. It is a schematic diagram which showed the typical 1st process of assembling a battery module. It is a schematic diagram which showed the typical 2nd process of assembling a battery module. It is a schematic diagram which showed the typical 3rd process of assembling a battery module. It is a schematic diagram which showed the typical 4th process of assembling a battery module. It is a schematic diagram which showed the typical 5th process of assembling a battery module. It is a schematic diagram which showed the typical 6th process of assembling a battery module. It is a schematic diagram which showed the typical 7th process of assembling a battery module. It is a schematic diagram which showed the typical 8th process of assembling a battery module. It is an exploded perspective view which shows the structural example of the auxiliary machine module. It is a perspective view which shows the assembly example of a battery module and an auxiliary machine module. It is an exploded perspective view which shows the structural example of the upper case. It is a perspective view which shows the configuration example in which the battery module is housed in the lower case. 9 is a cross-sectional view taken along the line AA of FIG. It is an enlarged view of the part surrounded by the broken line of FIG. It is external perspective view which shows the structural example of the battery module which concerns on 2nd Embodiment. It is a top view of the battery module of FIG. It is a bottom view of the battery module of FIG. It is an exploded perspective view which shows the structural example of the battery module of FIG. 9 is a cross-sectional view of the battery module of FIG. 12 corresponding to the cross section taken along the line AA of FIG. 9 is a cross-sectional view of the battery module of FIG. 12 corresponding to the BB cross section of FIG. FIG. 6 is a schematic view showing the arrangement relationship between the battery cell and the heat sink of FIG. 14 in a top view. It is an enlarged cross-sectional view corresponding to the B'-B'cross section of FIG. 9 which enlarged and showed another 1st example of a heat sink. It is a top view which shows the other 2nd example of a heat sink schematically. It is a side view which shows the other 2nd example of a heat sink schematically. FIG. 3 is a perspective view showing another example of the configuration related to the lower case.

Hereinafter, one embodiment will be described with reference to the drawings. In the following description, the front-back, left-right, and up-down directions are based on the directions of the arrows in the figure. In one embodiment, as an example, the stacking direction of the plurality of battery cells 10 is described as being in the vertical direction, but the present invention is not limited to this. The stacking direction of the plurality of battery cells 10 may be any other direction.

(First Embodiment)
FIG. 1 is an exploded perspective view showing a configuration example of the assembled battery 1 according to the first embodiment. FIG. 2 is an external perspective view showing a configuration example of the assembled battery 1 according to the first embodiment.

The assembled battery 1 may be mounted on a vehicle equipped with an internal combustion engine, or a vehicle such as a hybrid vehicle capable of traveling by the power of both the internal combustion engine and an electric motor. The assembled battery 1 may be mounted under the seat of the vehicle, for example. The assembled battery 1 may be mounted in the center console of the vehicle, for example. The assembled battery 1 is not limited to the vehicle, and may be used for other purposes.

As shown in FIG. 1, the assembled battery 1 has a battery module 100, an auxiliary machine module 200, a lower case 300, and an upper case 400. The lower case 300 and the upper case 400 are engaged with each other by, for example, a fastening structure such as screwing, or a fitting structure using a claw or a clip. As a result, a space is formed inside the assembled battery 1. The lower case 300 and the upper case 400 are simply collectively referred to as a case. The battery module 100 and the auxiliary equipment module 200 are located in the space formed by the lower case 300 and the upper case 400. The battery module 100 is located on the lower case 300 side. The auxiliary machine module 200 is located on the upper case 400 side. That is, the auxiliary machine module 200 is located above the battery module 100. The lower case 300 and the upper case 400 are made of, for example, a metal material, but may be made of a resin material.

The battery module 100 has a restraint plate 60 located above the battery cells 10 stacked in the vertical direction. The restraint plate 60 has a protrusion 62 that projects downward toward the battery cell 10. The lower case 300 has a bottom surface 310 located below. The bottom surface 310 has a protrusion 312 that projects upward toward the battery cell 10.

As shown in FIG. 2, the assembled battery 1 has a positive output terminal 410, a negative output terminal 420, a connector 430, and a gas discharge unit 440 in the upper case 400. The positive output terminal 410 and the negative output terminal 420 are electrically connected to the electrode tab 12 (see FIGS. 3A and 3B) of the battery cell 10 included in the battery module 100. The connector 430 is electrically connected to a relay 220 (see FIG. 6) or the like included in the auxiliary equipment module 200. The gas discharge unit 440 discharges the gas generated from the battery cell 10 inside the case to the outside of the assembled battery 1.

3A and 3B are diagrams showing a configuration example of the battery cell 10 alone. FIG. 3A is a top view of the battery cell 10. FIG. 3B is a side view of the battery cell 10.

As shown in FIGS. 3A and 3B, the battery cell 10 is a pair of an exterior member 16 that internally holds the electrolytic solution, the cell electrode, and the like of the battery cell 10 and a pair located on the front and rear sides of the battery cell 10. It has a negative electrode tab 12n and a positive electrode tab 12p. The shape of the battery cell 10 may be a flat plate as a whole. The portion where the electrolytic solution, the cell electrode, and the like are internally held by the exterior member 16 is also referred to as a holding portion 18. The portion where the exterior member 16 is sealed so as to prevent leakage of contents such as an electrolytic solution by being adhered, crimped, or welded is also referred to as a sealing portion 19. The vertical thickness of the sealing portion 19 is thinner than the vertical thickness of the holding portion 18.

The exterior member 16 may include a laminated film. The outermost layer of the exterior member 16 may contain a resin material for ensuring electrical insulation. In other words, the battery cell 10 may have an insulating member on its surface layer. The exterior member 16 may include an insulating layer.

The battery cell 10 has a first outer surface 11 on each of the front and rear sides. The battery cell 10 has a second outer surface 13 on each of the left side and the right side. The first outer surface 11 and the second outer surface 13 may be configured as an end portion of the exterior member 16. The battery cell 10 has a third outer surface 14 on each of the upper and lower sides of the holding portion 18. The third outer surface 14 may be configured as the outermost layer of the exterior member 16. The surfaces extending from the first outer surface 11, the second outer surface 13, and the third outer surface 14 intersect with each other.

The negative electrode tab 12n and the positive electrode tab 12p are collectively referred to as the electrode tab 12. The negative electrode tab 12n and the positive electrode tab 12p may project from the front and rear first outer surfaces 11, respectively. The negative electrode tab 12n and the positive electrode tab 12p may be replaced. The negative electrode tab 12n and the positive electrode tab 12p may project in opposite directions. The negative electrode tab 12n and the positive electrode tab 12p may protrude in the same direction. It is assumed that the battery cells 10 are stacked in the vertical direction with a pair of positive electrode tabs 12p and negative electrode tabs 12n arranged along the front-rear direction.

The electrode tab 12 may protrude from the central portion of the first outer surface 11. The electrode tab 12 may project substantially parallel to the front-rear direction. The electrode tab 12 may have a tab side surface 17 along the protruding direction. The electrode tab 12 may have a flat plate shape.

FIG. 4 is an exploded perspective view showing a configuration example of the battery module 100.

As shown in FIG. 4, the battery module 100 has a plurality of battery cells 10 stacked in the vertical direction. The number of battery cells 10 is not limited to 6, and may be 5 or less, or 7 or more. The stacked battery cells 10 may be adhered by an adhesive layer 15 located between the battery cells 10. The battery module 100 may have a heat sink 70 between the stacked battery cells 10. The heat sink 70 may be adhered to the battery cell 10 by the adhesive layer 15.

The heat radiating plate 70 is made of a material having electrical conductivity in order to improve the heat radiating property from the battery cell 10. At this time, the heat sink 70 is electrically insulated from the battery cell 10 by any method. For example, the heat sink 70 may be insulated by an insulating layer constituting the surface layer of the battery cell 10. For example, the heat sink 70 may be insulated by an insulating sheet 50 separately arranged between the battery cell 10 and the heat sink 70. For example, the heat sink 70 may be insulated by an insulating layer constituting the surface layer of the heat sink 70. At this time, the heat radiating plate 70 is made of, for example, a metal material having an electrically insulating material attached to the surface thereof.

The adhesive layer 15 may be provided on the third outer surface 14 of the battery cell 10. The adhesive layer 15 may be provided on one of the upper and lower third outer surfaces 14 of the battery cell 10. The adhesive layer 15 may contain an adhesive or a pressure-sensitive adhesive such as double-sided tape or hot melt. The adhesive layer 15 may be formed, for example, by applying an adhesive to the third outer surface 14 of each battery cell 10, or by various other methods. The number of the adhesive layers 15 located between the constituent parts is not limited to two as illustrated in FIG. 4, and may be one or three or more. The shape of the adhesive layer 15 is not limited to the rectangle illustrated in FIG. 4, and may be various other shapes.

The battery module 100 further includes a first cell case 20 and a second cell case 30. The configuration in which the first cell case 20 and the second cell case 30 are combined is simply collectively referred to as a cell case. The first cell case 20 and the second cell case 30 are located on the left side and the right side of the stacked battery cells 10, respectively. The first cell case 20 and the second cell case 30 accommodate the stacked battery cells 10 in a state of being engaged with each other. More specifically, the cell case internally supports the stacked battery cells 10 and arranges the electrode tabs 12. The first cell case 20 and the second cell case 30 may have partition plates 23 and 33 projecting inward from the side surface, respectively. The partition plates 23 and 33 are located between the sealing portions 19 of each battery cell 10 in a state where the first cell case 20 and the second cell case 30 are engaged with each other.

The shape of the first cell case 20 is a substantially rectangular frame when viewed from above, and the right side is open. In other words, the shape of the first cell case 20 is a substantially U-shape with the right side open. The shape of the second cell case 30 is a substantially rectangular frame when viewed from above, and the left side is open. In other words, the shape of the second cell case 30 is a substantially U-shape with the left side open. The first cell case 20 and the second cell case 30 are engaged with each other on the open side to form a rectangular frame shape when viewed from above. It can be said that the shape of the configuration in which the first cell case 20 and the second cell case 30 are engaged is substantially square when viewed from above. The cell case houses the stacked battery cells 10 in a frame-shaped structure. The portion corresponding to the inside of the frame when viewed from above shall be the opening 22 and the opening 32 in the first cell case 20 and the second cell case 30, respectively. The first cell case 20 has openings 22 at both ends of the battery cells 10 in the stacking direction. The second cell case 30 has openings 32 at both ends of the battery cells 10 in the stacking direction.

The first cell case 20 and the second cell case 30 may be engaged with each other by, for example, an engaging claw provided on one side and an engaging hole provided on the other side. The first cell case 20 and the second cell case 30 each have an engaging portion protruding from an arbitrary surface, and the protruding engaging portion is engaged by being sandwiched by an elastic member such as a clip. You may. The first cell case 20 and the second cell case 30 may be engaged by various fastening structures such as screwing. The first cell case 20 and the second cell case 30 are not limited to these examples, and may be engaged by various methods. By doing so, the assembly of the assembled battery 1 may be facilitated. As a result, the reliability of the product can be improved.

The first cell case 20 and the second cell case 30 may contain a material having a relatively high rigidity. The first cell case 20 and the second cell case 30 may be made of, for example, a metal material or a resin material having an electrically insulating material such as PET (Polyethylene Terephthalate) resin on the surface thereof.

The second cell case 30 has slits 34 in each of the front-rear directions. In a state where the battery cell 10 is housed in the cell case, the electrode tab 12 of the battery cell 10 penetrates the slit 34 and protrudes to the outside of the cell case. The number of slits 34 corresponds to the number of battery cells 10.

The battery module 100 further includes a tab-to-tab bus bar 40, a total plus bus bar 41, and a total minus bus bar 42 that electrically connect the electrode tabs 12 projecting outward from the cell case. The tab-to-tab bus bar 40, total plus bus bar 41, and total minus bus bar 42 are simply collectively referred to as bus bars.

Basba is composed of a material having electrical conductivity. For example, the bath bar is made of a resin material to which a metal material or an electrically conductive material is applied. The metal material includes, for example, aluminum or copper. The material constituting the bus bar is determined so that weldability is ensured according to the material constituting the electrode tab 12. The surface of the bus bar may be plated to absorb the laser beam for laser welding that joins the bus bar and the electrode tab 12.

The battery cells 10 are laminated so that the positive electrode tabs 12p and the negative electrode tabs 12n are alternately interchanged. That is, when the positive electrode tab 12p and the negative electrode tab 12n of one battery cell 10 face forward and backward, respectively, the positive electrode tab 12p and the negative electrode tab 12n of the battery cell 10 laminated next to the battery cell 10 are respectively. , Looking backwards and forwards.

The tab-to-tab bus bar 40 electrically connects the positive electrode tab 12p of one battery cell 10 and the negative electrode tab 12n of the battery cell 10 laminated next to the battery cell 10. By doing so, the stacked battery cells 10 are electrically connected in series. When the battery cells 10 are connected in series, the positive electrode tab 12p of the battery cells 10 located at the upper end or the lower end is not connected to any of the battery cells 10. It is assumed that the positive electrode tab 12p of the battery cell 10 located at the upper end is not connected to any of the battery cells 10. The total plus bus bar 41 is connected to the positive electrode tab 12p of the battery cell 10 located at the upper end. In this case, the negative electrode tab 12n of the battery cell 10 located at the lower end is not connected to any of the battery cells 10. The total minus bus bar 42 is connected to the negative electrode tab 12n of the battery cell 10 located at the lower end. By doing so, the potential difference generated between the total plus bus bar 41 and the total minus bus bar 42 is output as the total voltage of the battery cells 10 electrically connected in series.

The assembled battery 1 may further have a voltage detection unit. The voltage detection unit may be electrically connected to the electrode tab 12 via the bus bar to detect the terminal voltage of each battery cell 10.

The battery module 100 further includes a restraint plate 60 that restrains the battery cells 10 stacked in the vertical direction from above. The restraint plate 60 is fastened to the fastening portion 66 provided in the first cell case 20 and the second cell case 30 by the restraint plate fastening member 64. The broken line in FIG. 4 shows an example of the correspondence between the restraint plate fastening member 64 and the fastening portion 66.

The restraint plate 60 may be configured to include a material having a relatively high rigidity. The restraint plate 60 may be made of, for example, only a metal material. The configuration of the restraint plate 60 is not limited to this, and may be a resin material or a metal material having an electrically insulating material such as PET resin on the surface thereof. The shape of the restraint plate 60 may be substantially flat. The restraint plate 60 has a convex portion 62. The convex portion 62 of the restraint plate 60 pressurizes the upper surface of the battery cell 10 through the openings 22 and 32 of the cell case. By doing so, the stacked battery cells 10 are constrained. Therefore, the battery module 100 can be easily handled. When the restraint plate 60 pressurizes the battery cell 10 through the openings 22 and 32 of the cell case, the force for pressurizing the battery cell 10 is less likely to be applied to the cell case. As a result, the cell case is less likely to deteriorate or be damaged.

The battery module 100 may have an insulating sheet 50 between the battery cells 10 stacked in the vertical direction and the restraint plate 60. That is, the restraint plate 60 may be laminated with respect to the battery cell 10 via the insulating sheet 50. The insulating sheet 50 may be adhered to the battery cell 10 by an adhesive layer 15. The insulating sheet 50 may abut on the upper surface of the battery cell 10 located at the upper end of the stacked battery cells 10. The insulating sheet 50 may abut on the lower surface of the battery cell 10 located at the lower end of the stacked battery cells 10. The insulating sheet 50 may contain an electrically insulating material such as polyethylene (PE: polyethylene) or polypropylene (PP: polypropylene) resin. The shape of the insulating sheet 50 may be substantially flat, but is not limited to this. The insulating sheet 50 may be adhered to the restraint plate 60 by an adhesive layer 15. By providing the insulating sheet 50, the electrical insulation between the upper surface of the battery cell 10 and the restraining plate 60 can be improved. The restraint plate 60 may be adhered to the battery cell 10 by the adhesive layer 15 without passing through the insulating sheet 50. When the restraint plate 60 is adhered to the battery cell 10 without passing through the insulating sheet 50, the exterior member 16 of the battery cell 10 may include a layer of the insulating member on its surface layer or the like. The layer of the insulating sheet 50 or the insulating member located between the restraining plate 60 and the battery cell 10 is also referred to as a first insulating layer. By having the first insulating layer between the restraining plate 60 and the battery cell 10 in the battery module 100, the electrical insulation between the restraining plate 60 and the battery cell 10 can be improved.

The first cell case 20 may have a side opening 25 on the left side surface. The second cell case 30 may have a side opening 35 on the right side surface. When the battery module 100 has the heat radiating plate 70, a portion protruding from the heat radiating plate 70 in the left-right direction can protrude to the outside of the cell case through the side opening portions 25 and 35.

5A to 5H are schematic views showing typical first steps to eighth steps for assembling the battery module 100, respectively. The battery module 100 may be assembled according to the procedure illustrated in FIGS. 5A-5H.

In the process shown in FIG. 5A, a jig 90 is used to assemble the battery module 100. The jig 90 may be configured so that the battery cell 10 or the heat sink 70 or the like placed on the jig 90 is aligned with the jig 90.

In the process shown in FIG. 5B, the battery cell 10 is placed on the jig 90. The jig 90 may have an inner surface corresponding to the shapes of the first outer surface 11 and the second outer surface 13 of the battery cell 10 so that the battery cell 10 is placed in a aligned state. The jig 90 may have a shape corresponding to the electrode tab 12 protruding from the central portion of the first outer surface 11 of the battery cell 10. An adhesive layer 15 may be provided on the upper surface or the lower surface of the battery cell 10.

In the process shown in FIG. 5C, the heat sink 70 is placed on the jig 90. The jig 90 may have a boss 92 and a step so that the heat sink 70 and the like can be aligned and placed. The heat sink 70 may have a protrusion and a hole 72 at the end, which are used when the battery module 100 is fastened to the lower case 300. The heat radiating plate 70 may be aligned by the protrusion abutting on the step of the jig 90 and the hole 72 fitting into the boss 92 of the jig 90.

In the process shown in FIG. 5D, the insulating sheet 50 may be further placed on the upper surface of the stacked battery cells 10. An adhesive layer 15 may be provided on the upper surface of the insulating sheet 50.

In the process shown in FIG. 5E, the second cell case 30 is inserted into the configuration in which at least the battery cells 10 are stacked. At that time, the partition plate 33 of the second cell case 30 is inserted between the sealing portions 19 of the laminated battery cells 10. The configuration in which the battery cells 10 are laminated is such that the battery cells 10 are adhered to each other or the battery cells 10 and other configurations are adhered to each other by the adhesive layer 15, so that the alignment is performed even when the battery cells 10 are taken out from the jig 90. It can be maintained in the same state as it is.

In the process shown in FIG. 5F, the first cell case 20 is inserted from the opposite side of the second cell case 30 with respect to the configuration in which the battery cells 10 are stacked. At that time, the partition plate 23 of the first cell case 20 is inserted between the sealing portions 19 of the stacked battery cells 10. The electrode tab 12 of the battery cell 10 projects outward from the slit 34 of the second cell case 30.

In the process shown in FIG. 5G, the tab-to-tab bus bar 40, the total plus bus bar 41, and the total minus bus bar 42 are electrically connected to the electrode tab 12. The bus bar and the electrode tab 12 may be electrically connected by, for example, welding or welding. When the positive electrode tab 12p and the negative electrode tab 12n of the adjacent battery cells 10 are joined to the inter-tab bus bar 40 by welding, the battery cells 10 are accurately joined by maintaining the aligned state. sell.

Further, the restraint plate 60 is attached from the upper surface to the configuration in which the battery cells 10 are laminated in the cell case. The convex portion 62 of the restraint plate 60 passes through the openings 22 and 32 of the cell case and abuts on the upper surface of the configuration in which the battery cells 10 are laminated. The restraint plate 60 may be adhered to a structure in which the battery cells 10 are laminated by the adhesive layer 15.

In the process shown in FIG. 5H, the restraint plate 60 may be fastened to the cell case by the restraint plate fastening member 64. By fastening the restraint plate 60 to the cell case, the assembly of the battery module 100 is completed.

When the battery modules 100 are assembled according to the steps exemplified in FIGS. 5A to 5H, the accuracy of positioning between the electrode tabs 12 of the battery cells 10 stacked adjacent to each other can be improved. As a result, the electrode tab 12 and the bus bar can be easily joined with high accuracy, and the reliability of the assembled battery 1 can be improved.

Durability when the battery module 100 is subjected to vibration or impact due to the laminated parts such as the battery cell 10, the heat sink 70, the insulating sheet 50, and the restraining plate 60 being adhered by the adhesive layer 15. Can be improved. For example, when the assembled battery 1 having the battery module 100 is mounted on a vehicle, the relative displacement of each part of the battery module 100 can be reduced due to vibration or impact during traveling of the vehicle. By adhering each part of the battery module 100, each part is less likely to be damaged even when subjected to vibration, impact, or the like.

The battery cells 10 are easily isolated from each other by having the partition plates 23 and 33 located between the sealing portions 19 of the battery cells 10, respectively, in the first cell case 20 and the second cell case 30. For example, even when the battery cells 10 deteriorate over time and are deformed, it becomes difficult for the battery cells 10 stacked adjacent to each other to come into contact with each other.

Since the cell case is made of a metal material or a resin material having an electrically insulating material on the surface, the electric parts and the like located inside the assembled battery 1 and the battery cell 10 are electrically connected to each other. Can be insulated from.

Further, even when the lower case 300 and the upper case 400 of the assembled battery 1 are made of metal, it is possible to secure the insulation between the battery cell 10 and the electric parts and the like located outside the assembled battery 1. If the lower case 300 and the upper case 400 are made of a resin material, even if the cell case is made of a metal material, the battery cell 10 and the electric parts located outside the assembled battery 1 can be similarly connected. Insulation can be ensured.

FIG. 6 is an exploded perspective view showing a configuration example of the auxiliary machine module 200.

As shown in FIG. 6, the auxiliary equipment module 200 has an auxiliary equipment pedestal 210, a relay 220, a current sensor 230, a fuse 240, and a substrate 260. The current sensor 230 has a fastening hole 231 at its terminal, and is fastened to the fastening portion 212 of the auxiliary machine pedestal 210 by the fastening member 252. The fastening hole 231 at one end of the current sensor 230 is fastened together with the fastening hole 251 of the copper bus bar 250 that is electrically connected to the relay 220. The relay 220 has a fastening hole 221 at its terminal and is fastened to the fastening portion 212 of the auxiliary machine pedestal 210 by the fastening member 252. The fastening hole 221 at one end of the relay 220 is fastened together with the fastening hole 251 of the copper bus bar 250 that is electrically connected to the current sensor 230. The fastening hole 221 at the other end of the relay 220 is fastened together with the fastening hole 251 of the copper bus bar 250 that is electrically connected to the fuse 240. The fuse 240 has a fastening hole 241 at its terminal and is fastened to the fastening portion 212 of the auxiliary machine pedestal 210 by the fastening member 252. The fastening hole 241 at one end of the fuse 240 is fastened together with the fastening hole 251 of the copper bus bar 250 that is electrically connected to the relay 220. The substrate 260 has, for example, fastening holes 261 at four corners, and is fastened to the fastening portion 214 of the auxiliary machine pedestal 210 by the fastening member 262. The auxiliary machine pedestal 210 has a fastening hole 216. When the auxiliary module 200 is housed in the lower case 300 together with the battery module 100, the module fastening member 270 (see FIG. 7) penetrates the fastening hole 216, whereby the fastening portion 340 of the lower case 300 (FIG. 1). See).

FIG. 7 is a perspective view showing an assembly example of the battery module 100 and the auxiliary machine module 200.

As shown in FIG. 7, the auxiliary machine pedestal 210 of the auxiliary machine module 200 is fastened to the first cell case 20 and the second cell case 30 by the module fastening member 270. The module fastening member 270 may be fastened to the fastening portion 340 (see FIG. 1) of the lower case 300 by combining the auxiliary module 200 and the battery module 100. The current sensor 230 is electrically connected to the copper bus bar 250, which is electrically connected to the total plus bus bar 41, at a terminal different from the side electrically connected to the relay 220.

The assembled battery 1 further has a positive output terminal 410 and a negative output terminal 420. The fuse 240 is electrically connected to the positive output terminal bus bar 412, which is electrically connected to the positive output terminal 410, at a terminal different from the side electrically connected to the relay 220. That is, the positive output terminal 410 is electrically connected to the total positive bus bar 41 via the fuse 240, the relay 220, and the current sensor 230 connected in series. The negative output terminal 420 is electrically connected to the total negative output terminal 42 via the negative output terminal bus bar 422. The positive output terminal 410 may be fastened to the fastening portion 330 (see FIG. 1) of the lower case 300 by screwing or the like in the fastening hole 414. The negative output terminal 420 may be fastened to the lower case 300 by screwing or the like in the fastening hole 424.

The assembled battery 1 may further have a bus bar cover 80 that covers the tab-to-tab bus bar 40, the total plus bus bar 41, and the total minus bus bar 42. By covering the bus bar with the bus bar 80, even if the assembled battery 1 is deformed or damaged due to an impact such as a collision, the electrical insulation between the bus bar and the lower case 300 is ensured, so that the reliability of the assembled battery 1 is ensured. Can be enhanced.

The relay 220 functions as a switching element for connecting or disconnecting the battery cell 10 and the positive output terminal 410.

The current sensor 230 detects the magnitude of the current flowing from the battery cell 10 to the positive output terminal 410. The current sensor 230 may output the magnitude of the detected current to the substrate 260.

The fuse 240 may include a fuse body, an insulating resin housing that houses and holds the fuse body, and an insulating resin cover that covers the housing. The fuse 240 is blown by the flow of an overcurrent.

The substrate 260 may have a BMS (Battery Management System). BMS is also called a battery controller. The BMS may be configured to include at least one processor. The BMS may be communicably connected to the current sensor 230 and obtain a current detection result from the current sensor 230. The BMS may be communicably connected to the relay 220 and output information for controlling the opening and closing of the relay 220. The BMS may be electrically connected to the inter-tab bus bar 40 and detect the potential of the inter-tab bus bar 40. The BMS may be communicably connected to a sensor that detects the potential of the inter-tab bus bar 40, and may acquire the detection result of the potential of the inter-tab bus bar 40. The BMS may output the information about the battery cell 10 to the outside through the connector 430 (see FIG. 8).

FIG. 8 is an exploded perspective view showing a configuration example of the upper case 400.

As shown in FIG. 8, the upper case 400 has a connector 430 and a gas discharge unit 440. The connector 430 is communicably connected to the board 260 of the auxiliary equipment module 200. The connector 430 may be connectable to an external circuit such as an ECU (Electric Control Unit) of a vehicle equipped with the assembled battery 1, for example.

The upper case 400 has a fastening portion 450 that is fastened to the fastening portion 320 (see FIG. 9) of the lower case 300. The fastening portion 320 of the lower case 300 and the fastening portion 450 of the upper case 400 may be fastened by screwing or the like, or may be fastened by an elastic member such as a clip. The case configured by fastening the upper case 400 and the lower case 300 can protect the battery module 100 by surrounding the battery module 100.

The battery cell 10 may deteriorate over time by repeating charging and discharging. As the battery cell 10 deteriorates over time, gas due to decomposition or volatilization of the electrolytic solution may be generated inside the battery cell 10. When the pressure of the gas inside the battery cell 10 exceeds a predetermined value, the gas can be released to the outside from a part of the sealing portion 19 of the battery cell 10. The gas released from the inside of the battery cell 10 can be accumulated in the space inside the assembled battery 1 surrounded by the lower case 300 and the upper case 400. The gas accumulated in the space inside the assembled battery 1 can be discharged to the outside of the assembled battery 1 through the gas discharging unit 440 of the upper case 400. The gas discharge portion 440 is provided on the upper surface of the upper case 400, but is not limited to this, and may be provided on the side surface of the upper case 400, or the bottom surface 310 (see FIG. 10) or the side surface of the lower case 300. It may be provided in.

The gas discharge unit 440 has a gas cover 442 and a breather 444. The gas cover 442 can protect the breather 444 from an external impact or the like by covering the breather 444. The breather 444 has an internal pressure adjusting film having waterproof and dustproof properties as well as breathability in the gas discharge path. When the gas discharge unit 440 has the breather 444, the gas accumulated in the space inside the assembled battery 1 is discharged to the outside of the assembled battery 1, and water, dust, etc. are discharged from the outside of the assembled battery 1 to the assembled battery 1. It becomes difficult to enter the inside of 1. As a result, the reliability of the assembled battery 1 can be improved.

FIG. 9 is a perspective view showing a configuration example in which the battery module 100 is housed in the lower case 300.

As shown in FIG. 9, the battery module 100 is fastened to the fastening portion 340 (see FIG. 1) of the lower case 300 in a state of being housed in the lower case 300. When the auxiliary machine module 200 is mounted on the upper part of the battery module 100, the auxiliary machine pedestal 210 and the cell case are collectively fastened to the fastening portion 340 of the lower case 300 by the module fastening member 270 (see FIG. 7). ..

FIG. 10 is a cross-sectional view taken along the line AA of FIG. FIG. 11 is an enlarged view of the portion surrounded by the broken line in FIG.

As shown in FIGS. 10 and 11, the lower case 300 has a bottom surface 310 on the lower side. In a state where the battery module 100 is housed in the lower case 300, the stacked battery cells 10 are pressurized from the bottom surface 310 located below and the restraint plate 60 located above. In other words, the bottom surface 310 of the lower case 300 pressurizes the battery cell 10 from the side opposite to the side on which the restraint plate 60 pressurizes the battery cell 10. It can be said that the stacked battery cells 10 are sandwiched between the bottom surface 310 and the restraint plate 60. The stacked battery cells 10 can be stably housed in the lower case 300 by being sandwiched. Since the bottom surface 310 of the lower case 300 has a function of pressurizing the battery cell 10 from the lower side, a member only for pressurizing the battery cell 10 from the lower side can be omitted. As a result, the assembled battery 1 can be made smaller and lighter, the cost can be reduced, and the reliability of the holding structure of the battery cell 10 can be improved.

The bottom surface 310 may abut on the lower surface of the battery cell 10 via the insulating sheet 50. The insulating sheet 50 may be adhered to the bottom surface 310 by the adhesive layer 15. By providing the insulating sheet 50, the electrical insulation between the lower surface of the battery cell 10 and the bottom surface 310 of the lower case 300 can be improved. The bottom surface 310 may be adhered to the battery cell 10 by the adhesive layer 15 without passing through the insulating sheet 50. When the bottom surface 310 is adhered to the battery cell 10 without passing through the insulating sheet 50, the exterior member 16 of the battery cell 10 may include a layer of the insulating member on its surface layer or the like. The layer of the insulating sheet 50 or the insulating member located between the bottom surface 310 and the battery cell 10 is also referred to as a second insulating layer. By having the battery module 100 have a second insulating layer between the bottom surface 310 and the battery cell 10, the electrical insulation between the battery cell 10 and the lower case 300 can be improved.

The bottom surface 310 has a convex portion 312 protruding upward. The convex portion 312 may abut on a predetermined range including the center of the lower surface of the battery cell 10 through the openings 22 and 32 of the cell case. The convex portion 62 of the restraint plate 60 located above the battery module 100 may come into contact with a predetermined range including the center of the upper surface of the battery cell 10 through the openings 22 and 32 of the cell case. The protrusion 62 may abut on the upper surface of the battery cell 10 via another configuration such as the insulating sheet 50. In a state where the battery module 100 is housed in the lower case 300, the stacked battery cells 10 are sandwiched between the convex portion 312 located below and the convex portion 62 located above. The stacked battery cells 10 are firmly restrained by being sandwiched from both the upper and lower sides. The stacked battery cells 10 are pressurized by the convex portion 62 and the convex portion 312 in a predetermined range including the center of each of the upper and lower surfaces. The battery cell 10 may be pressurized with a greater force at the central portion of the upper surface and the lower surface of the holding portion 18 than the peripheral portion near the sealing portion 19.

The battery cell 10 may deteriorate over time by repeating charging and discharging. As the battery cell 10 deteriorates over time, gas due to decomposition or volatilization of the electrolytic solution may be generated inside the battery cell 10. The gas generated inside the battery cell 10 can expand the battery cell 10. The stacked battery cells 10 are pressed from the upper and lower surfaces by the convex portions 62 of the restraint plate 60 and the convex portions 312 of the bottom surface 310, so that the stacked battery cells 10 are less likely to expand in the direction in which the battery cells 10 are laminated.

The restraint plate 60 and the bottom surface 310 pressurize the stacked battery cells 10 through the openings 22 and 32 of the cell case. That is, the cell case is not directly pressurized by the restraint plate 60 and the bottom surface 310. By not pressurizing the cell case, the cell case is less likely to bend. As a result, the cell case is less likely to be damaged.

Since the restraint plate 60 is made of a metal material, the rigidity of the restraint plate 60 can be improved. As a result, the battery cells 10 are less likely to expand in the direction in which the battery cells 10 are stacked, and the vertical position of the battery cells 10 can be restricted. The electrical insulation can be improved by including the restraining plate 60 with a resin material or a metal material to which an electrically insulating material is applied. When the restraint plate 60 is made of a resin material, the assembled battery 1 can be reduced in weight and can be manufactured at low cost.

By pressurizing the battery cell 10 near the center of the upper surface and the lower surface of the holding portion 18, the gas generated inside the battery cell 10 can be collected in a peripheral portion near the sealing portion 19. When the pressure of the gas generated inside the battery cell 10 exceeds a predetermined value, the gas can be discharged from the sealing portion 19 to the outside of the battery cell 10. By collecting the gas in the peripheral portion near the sealing portion 19, the gas is easily discharged to the outside of the battery cell 10. That is, when the battery cell 10 is pressurized near the center of the upper surface and the lower surface of the holding portion 18, the gas is easily discharged to the outside of the battery cell 10. As a result, the reliability of the battery cell 10 can be improved.

By having the insulating sheet 50 in the battery module 100, electrical insulation between the restraining plate 60 and the internal battery cell 10 can be ensured.

The symmetry of the cell case can be improved by projecting the positive electrode tab 12p and the negative electrode tab 12n of the battery cell 10 in opposite directions along the front-rear direction. By doing so, the cell case can be formed in a well-balanced manner.

(Second Embodiment)
FIG. 12 is an external perspective view showing a configuration example of the battery module 100 according to the second embodiment. 13A is a top view of the battery module 100 of FIG. 13B is a bottom view of the battery module 100 of FIG. FIG. 14 is an exploded perspective view showing a configuration example of the battery module 100 of FIG. FIG. 15A is a cross-sectional view of the battery module 100 of FIG. 12 corresponding to the cross section taken along the line AA of FIG. FIG. 15B is a cross-sectional view of the battery module 100 of FIG. 12 corresponding to the BB cross section of FIG. FIG. 16 is a schematic view showing the arrangement relationship between the battery cell 10 of FIG. 14 and the heat radiating plate 70 in a top view. In the battery module 100 according to the second embodiment, the configuration of the heat sink 70 is different from that of the first embodiment. Hereinafter, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. The points different from the first embodiment will be mainly described.

As shown in FIG. 14, in the battery module 100 according to the second embodiment, the heat sink 70 is formed in a thin plate shape, and in a plurality of battery cells 10 stacked, the battery cell 10 is used for each battery cell 10. It is sandwiched between. That is, the heat sink 70 and the battery cell 10 are alternately laminated along the vertical direction. The battery cell 10 and the heat sink 70 are fixed to each other by an adhesive layer 15. The adhesive layer 15 is provided on both the upper and lower third outer surfaces 14 of the battery cell 10. The adhesive layer 15 contains, for example, an adhesive or an adhesive such as double-sided tape. The adhesive layer 15 is formed, for example, by applying an adhesive to the third outer surface 14 of each battery cell 10, or by various other methods.

Both ends of the laminated body including the plurality of battery cells 10 in the stacking direction are electrically insulated from the outside. More specifically, each of the upper and lower ends of the laminate including the plurality of battery cells 10 is electrically insulated from the outside by an insulating sheet 50 arranged between the battery cells 10 and the cell case. The insulation method is not limited to this. Each of the upper and lower ends of the laminate may be electrically insulated from the outside by a restraint plate 60. At this time, the restraint plate 60 is made of a resin material or a metal material having an electrically insulating material attached to the surface thereof. The upper and lower ends of the laminate may be electrically isolated from the outside by the cell case itself having no openings 22 and 32, respectively. Each of the upper and lower ends of the laminate may be electrically insulated from the outside by at least one of an insulating sheet 50, a restraining plate 60, and a cell case.

As shown in FIGS. 12, 13A, 13B, and 15B, the heat sink 70 projects from the cell case. More specifically, the right end portion of the heat sink 70 projects outward from the side opening 35 of the second cell case 30. The left end portion of the heat radiating plate 70 projects outward from the side opening 25 of the first cell case 20. The left and right ends of the heat radiating plate 70 project outward from each side opening of the cell case and are exposed inside the lower case 300 accommodating the battery module 100. Both ends of the heat sink 70 in the protruding direction are arranged inside the both ends of the cell case.

As shown in FIG. 16, the heat sink 70 is wider than the battery cell 10 in the protruding direction, that is, in the left-right direction. The heat radiating plate 70 is superimposed on the entire holding portion 18 that holds the cell electrode inside in the top view. During charging and discharging, heat is generated in the vicinity of the electrode tab 12 due to the contact resistance of the electrode tab 12 of the battery cell 10 with the bus bar. The heat generated in the vicinity of the electrode tab 12 tends to be transmitted inside the holding portion 18 toward the center of the cell electrode. At this time, due to the presence of the heat radiating plate 70 adjacent to the battery cell 10, the heat generated in the battery cell 10 is transmitted to the outside in the left-right direction via the heat radiating plate 70. As a result, heat is dissipated from the portion of the heat sink 70 exposed inside the lower case 300.

According to the battery module 100 according to the second embodiment as described above, heat is efficiently dissipated from the stacked battery cells 10. More specifically, since the heat sink 70 is wider than the battery cell 10 along the projecting direction, heat can easily escape along the projecting direction. In addition, since the heat sink 70 protrudes from the cell case, the heat generated in the battery cell 10 easily escapes to the inside of the lower case 300 via the heat sink 70. As a result, the temperature rise of the battery cell 10 is suppressed, so that the life of the battery cell 10 is extended.

Since both ends of the heat radiating plate 70 in the protruding direction are arranged inside the both ends of the cell case, interference between the heat radiating plate 70 and the lower case 300 is suppressed. As a result, damage to each component and deterioration of insulating property due to contact are suppressed. In addition, a gap is formed between the heat radiating plate 70 and the inner surface of the lower case 300, so that the heat radiating property is improved.

Since the heat radiating plate 70 overlaps with the entire holding portion 18, the battery cell 10 is uniformly pressed through the heat radiating plate 70 when the battery cell 10 is pressurized by the restraint plate 60. Since the end portion of the heat radiating plate 70 does not come into contact with the third outer surface 14 of the holding portion 18, damage to the battery cell 10 due to the end portion of the heat radiating plate 70 is suppressed. As a result, the reliability of the battery module 100 is improved.

Since both ends of the laminate including the plurality of battery cells 10 in the stacking direction are electrically insulated, heat dissipation from the laminate along the stacking direction is suppressed. This makes it easier for heat to escape along the left-right direction orthogonal to the stacking direction via the heat sink 70. Therefore, heat is efficiently dissipated by using the heat sink 70.

Since the battery cell 10 and the heat sink 70 are fixed to each other by the adhesive, the workability when laminating the battery cell 10 and the heat sink 70 is improved. Similarly, when the laminated body of the battery cell 10 and the heat radiating plate 70 is inserted into the cell case, the insertability is improved and the workability related to assembly is improved. As a result, the overall work efficiency related to the assembly work of the assembled battery 1 is improved.

Since the heat radiating plate 70 is sandwiched between the battery cells 10 for each battery cell 10, the heat radiating property from the laminated body including the plurality of battery cells 10 is improved. Since heat is similarly dissipated from each battery cell 10, temperature variation among the battery cells 10 in the battery module 100 is suppressed. As a result, the life of the battery module 100 is extended. Even when the heat sink 70 is sandwiched between the battery cells 10 for each battery cell 10, the heat sink 70 is formed in a thin plate shape, so that the battery module 100 is excessively tall. It is suppressed.

FIG. 17 is an enlarged cross-sectional view corresponding to the B'-B'cross section of FIG. 9, which is an enlarged view of another first example of the heat sink 70. FIG. 18A is a top view schematically showing another second example of the heat sink 70. FIG. 18B is a side view schematically showing another second example of the heat sink 70. FIG. 19 is a perspective view showing another example of the configuration related to the lower case 300.

In the battery module 100 according to the second embodiment, the shape of the heat radiating plate 70 is not limited to the above-mentioned contents. For example, as shown in FIG. 17, the heat sink 70 may be wider along the protruding direction toward the center along the stacking direction of the plurality of battery cells 10. More specifically, of the five heat sinks 70 arranged for the six stacked battery cells 10, the heat sink 70 located on the outermost side of the laminated body along the stacking direction is the narrowest. Is. Of the five heat sinks 70, the heat sink 70 located at the center of the laminated body along the stacking direction is the widest. With such a configuration of the heat radiating plate 70, heat is efficiently radiated even when heat is more likely to be trapped in the central portion of the laminated body, and the temperature uniformity of each battery cell 10 is improved. As a result, the life of the battery module 100 is extended.

For example, as shown in FIGS. 18A and 18B, the edge portion of the heat sink 70 in the protruding direction includes a portion inclined toward one side and a portion inclined toward the other side in the stacking direction of the battery cells 10. May be included alternately. For example, when seven edges A1 to A7 are defined from the front to the rear at the left end edge of the heat sink 70, the edges A1, A3, A5, and A7 are inclined downward. For example, the edges A2, A4, and A6 tilt upward. In addition to this, the edge portion of the heat radiating plate 70 in the protruding direction may have, for example, a sinusoidal shape. With such a configuration of the heat radiating plate 70, the surface area at the edge portion of the heat radiating plate 70 is increased, and the heat radiating property is further improved.

The case may be made of a metal material or a resin material integrally molded with the metal material. For example, as shown in FIG. 19, the lower case 300 may be made of a resin material integrally molded with the metal material 350. As a result, the heat generated from the battery module 100 is efficiently released to the outside.

The assembled battery 1 may have, for example, a blower unit 360 which is arranged inside the case and blows air toward the heat sink 70. At this time, the air inside the case is circulated by the air blown from the blower unit 360, and heat is released from the inside of the assembled battery 1 to the outside through the case. This further improves the heat dissipation of the battery module 100. When the heat radiating plate 70 has the shape as shown in FIGS. 18A and 18B, the contact area between the air circulating in the case and the heat radiating plate 70 is increased by the air blown from the blower unit 360. Therefore, heat exchange is promoted. The synergistic effect of the shape of the heat radiating plate 70 and the blower portion 360 further improves the heat radiating property of the battery module 100.

As long as the insulation between the heat radiating plate 70 and the lower case 300 is ensured, both ends of the heat radiating plate 70 in the left-right direction may come into contact with the inner surface of the lower case 300. This further improves the heat dissipation of the battery module 100. At this time, the left and right ends of the heat sink 70 may be bent along the inner surface of the lower case 300, and the bent portions may come into contact with the inner surface of the lower case 300. As a result, the contact area with the lower case 300 is increased, and the heat dissipation of the battery module 100 is further improved. By applying a filler such as grease to the contact portion between the bent portion of the heat radiating plate 70 and the inner surface of the lower case 300, the gap is filled with the filler. As a result, the contact property with each other is improved, and the heat dissipation property of the battery module 100 is further improved.

It will be apparent to those skilled in the art that the present invention can be realized in certain embodiments other than those described above, without departing from its spirit or its essential features. Therefore, the above description is exemplary and is not limited thereto. The scope of the invention is defined by the added claims, not by the earlier description. Some of all changes that are within their equality shall be contained therein.

For example, the shape, arrangement, number, and the like of each of the above-mentioned components are not limited to the contents shown in the above description and drawings. The shape, arrangement, number, and the like of each component may be arbitrarily configured as long as the function can be realized.

For example, the method of assembling the battery module 100 is not limited to the method described above. The battery module 100 may be assembled by any method as long as it can be assembled so as to exhibit its function. For example, each step in the method of assembling the battery module 100 described above can be rearranged so as not to be logically inconsistent, and a plurality of steps can be combined or divided into one.

The engagement direction between the first cell case 20 and the second cell case 30 is not limited to the left-right direction. The first cell case 20 and the second cell case 30 may be engaged in any direction as long as they are engaged so as to exert their functions.

The restraint plate 60 may also be arranged on the lower surface side of the battery module 100. As a result, the battery cell 10 is narrowly held by the restraint plate 60 having high rigidity from both the upper and lower directions, so that the pressure holding property is further improved.

1 set battery 10 Battery cell 11 1st outer surface 12 (12p, 12n) Electrode tab (positive electrode tab, negative electrode tab)
13 2nd outer surface 14 3rd outer surface 15 Adhesive layer 16 Exterior member 17 Tab side surface 18 Holding part 19 Sealing part 20 1st cell case 22 Opening 23 Partition plate 25 Side opening 30 2nd cell case 32 Opening 33 Partition plate 34 Slit 35 Side opening 40 Between tabs Bus bar 41 Total plus bus bar 42 Total minus bus bar 50 Insulation sheet 60 Restraint plate 62 Convex part 64 Restraint plate fastening member 66 Fastening part 70 Heat dissipation plate 72 Hole 80 Bus bar cover 90 Jigger 92 Boss 100 Battery module 200 Auxiliary machine module 210 Auxiliary machine pedestal 212, 214 Fastening part 216 Fastening hole 220 Relay 221 Fastening hole 230 Current sensor 231 Fastening hole 240 Fuse 241 Fastening hole 250 Copper bus bar 251 Fastening hole 252 Fastening member 260 Board 261 Fastening hole 262 Fastening member 270 module Fastening member 300 Lower case 310 Bottom 312 Convex part 320, 330, 340 Fastening part 350 Metal material 360 Blower part 400 Upper case 410 Positive output terminal 412 Positive output terminal Bus bar 414 Fastening hole 420 Negative output terminal 422 Negative output terminal Bus bar 424 Fastening hole 430 Connector 440 Gas Discharge 442 Gas Cover 444 Breather 450 Fastening A1, A2, A3, A4, A5, A6, A7 Edge

Claims (11)

With multiple stacked battery cells,
A cell case that internally supports the plurality of battery cells, and a cell case.
In the plurality of battery cells, a heat sink sandwiched between the battery cells and
Equipped with
The cell case has sides located inside the cell case from both ends.
The heat sink protrudes from the side surface of the cell case and is wider than the battery cell along the protruding direction .
Both ends of the heat sink in the protruding direction are arranged inside the both ends of the cell case .
Battery module. The battery cell has a holding portion that holds the cell electrode inside.
The heat sink is superimposed on the entire holding portion in a plan view seen from the stacking direction of the battery cells.
The battery module according to claim 1 . Both ends of the laminate containing the plurality of battery cells in the stacking direction are electrically insulated from the outside.
The battery module according to claim 1 or 2 . Each of the two ends is electrically insulated from the outside by the cell case itself and at least one of an insulating sheet and a restraining plate arranged between the battery cell and the cell case.
The battery module according to claim 3 . The restraint plate is made of a resin material or a metal material having an electrically insulating material on the surface thereof.
The battery module according to claim 4 . The battery cell and the heat sink are fixed to each other by an adhesive.
The battery module according to any one of claims 1 to 5 . Equipped with multiple heat sinks
The heat sink is sandwiched between the battery cells for each battery cell.
The battery module according to any one of claims 1 to 6 . The heat sink is wider along the projecting direction toward the center along the stacking direction of the plurality of battery cells.
The battery module according to claim 7 . The edge portion of the heat radiating plate in the protruding direction alternately includes a portion inclined toward one side and a portion inclined toward the other side in the stacking direction of the battery cells.
The battery module according to any one of claims 1 to 8 . A case containing the battery module according to any one of claims 1 to 9 and a case containing the battery module.
A blower unit that is arranged inside the case and blows air toward the heat sink,
To prepare
Batteries assembled. The case is made of a metal material or a resin material integrally molded with the metal material.
The assembled battery according to claim 10 .

Images