Cooling plate for battery, battery assembly, and inspection method therefor

Abstract

To provide a cooling plate for batteries which is less liable to become an obstacle of an insulation inspection, a battery assembly including such a cooling plate for batteries, and an inspection method therefor.SOLUTION: A cooling plate 10 for batteries of the present disclosure includes a flat surface portion 11, and a pair of side surface portions 12 facing each other. In the cooling plate for batteries of the present disclosure, a cutout or through-hole 12a is formed in the side surface portion. A battery assembly 1 of the present disclosure includes the cooling plate 10 for batteries of the present disclosure, and a battery 20 disposed on the flat surface portion of the cooling plate for batteries. The battery in the battery assembly of the present disclosure includes an electrode laminate 21, a current collector terminal 22, and a laminating film 23 sealing the electrode laminate. The laminating film includes a fusion resin layer, a metal layer, a protection resin layer, and an extending portion 23a. The extending portion is bent toward the electrode laminate, and the cooling plate for batteries is disposed such that the side surface portions of the cooling plate for batteries face the bent extending portion.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a cooling plate for a battery, a battery assembly, and an inspection method thereof.

Background Art

[0002] A battery having an electrode laminate, a current collector terminal electrically connected to the current collector portion of the electrode laminate, and a laminate film sealing the electrode laminate is known. Such a battery may generate heat during charging and discharging, and the battery performance may deteriorate due to this heat generation. Such a problem is particularly prominent in a battery module formed of a plurality of batteries, and thus a method for promoting heat dissipation in the battery module has been developed.

[0003] Patent Document 1 discloses a battery module having a plurality of heat dissipation plates (cooling plates), a laminate battery disposed between the heat dissipation plates, and a housing that houses the laminate battery and the heat dissipation plates.

[0004] In Patent Document 1, the heat dissipation plate has a contact portion and a flat portion with both ends bent. The contact portion is in close contact with the side surface of the housing, and the flat portion is disposed in close contact with the wide surface of the laminate battery, so that the heat generated during charging and discharging of the laminate battery is transferred to the housing side to cool each single battery.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Incidentally, between each metal material constituting a battery assembly formed by assembling a battery and a cooling plate (referred to as a heat dissipation plate in Patent Document 1), specifically, between the metal layer of the laminate film and the current collector terminal, and between the metal layer and the cooling plate, it is necessary to ensure insulation. The present inventors have devised an insulation inspection for evaluating the presence or absence of a short circuit between each metal material constituting such a battery assembly. However, the present inventors have found that the cooling plate may become an obstacle to such an insulation inspection.

[0007] An object of the present disclosure is to provide a cooling plate for a battery that is less likely to become an obstacle to insulation inspection, a battery assembly including such a cooling plate for a battery, and an inspection method thereof.

Means for Solving the Problems

[0008] The present inventors have found that the above problems can be solved by the following means. <Aspect 1> A cooling plate for a battery having a flat portion and a pair of opposing side portions, a notch or a through hole is formed in the side portion, Cooling plate for a battery. <Aspect 2> The cooling plate for a battery according to Aspect 1, wherein the notch or the through hole is formed at at least one end of the side portion. <Aspect 3> A battery assembly including the cooling plate for a battery according to Aspect 1 or 2 and a battery disposed on the flat portion of the cooling plate for a battery, the battery having an electrode laminate, a current collector terminal electrically connected to a current collecting portion of the electrode laminate, and a laminate film sealing the electrode laminate, the laminate film having a fusion resin layer, a metal layer, and a protective resin layer, and an extending portion extending to a periphery of the electrode laminate, the extending portion being bent toward the electrode laminate, and The battery cooling plate is arranged such that the side surface portion of the battery cooling plate faces the bent extension portion. Battery assembly. <Aspect 4> The inspection method of the battery assembly according to Aspect 3, including the following steps: (a) Insert a first inspection terminal through the notch or through-hole of the battery cooling plate according to Aspect 1 or 2 and pierce the extension portion of the laminate film to contact the metal layer. (b) Contact a second inspection terminal with the current collector terminal, evaluate the conductivity between the first inspection terminal and the second inspection terminal, and evaluate the presence or absence of a short circuit between the metal layer and the current collector terminal, and (c) Contact a third inspection terminal with the battery cooling plate, evaluate the conductivity between the first inspection terminal and the third inspection terminal, and evaluate the presence or absence of a short circuit between the metal layer and the battery cooling plate. <Aspect 5> The method according to Aspect 4, further including the following steps before step (a): Pierce two of the first inspection terminals into the extension portion of the laminate film at different positions to contact the metal layer, and confirm the conductivity between the two first inspection terminals. Contact two of the second inspection terminals with the current collector terminal at different positions, and confirm the conductivity between the two second inspection terminals, and Contact two of the third inspection terminals with the battery cooling plate at different positions, and confirm the conductivity between the two third inspection terminals.

Advantages of the Invention

[0009] According to the present disclosure, it is possible to provide a battery cooling plate that is less likely to cause obstacles in insulation inspection, a battery assembly including such a battery cooling plate, and an inspection method thereof.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. It should be noted that the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the disclosure. Also, the dimensional relationships in the respective drawings do not reflect the actual dimensional relationships.

[0012] 《Cooling Plate for Battery》 As illustrated in FIG. 1, the cooling plate 10 for a battery of the present disclosure has a flat portion 11 and a pair of opposing side portions 12. In the cooling plate 10 for a battery of the present disclosure, a notch or a through hole 12a is formed in the side portion 12.

[0013] The present inventors have found that when a battery is disposed on the flat portion and between the pair of side portions with respect to a cooling plate having both ends bent, that is, a cooling plate having a flat portion and a pair of opposing side portions, to form a battery assembly as illustrated in FIG. 2, the above-described insulation inspection may become difficult.

[0014] Specifically, for example, in a battery assembly including a cooling plate having no notch or through-hole in its side surface as illustrated in FIG. 5, when trying to pierce an inspection terminal into an extension portion of a laminate film to contact a metal layer as illustrated in FIG. 6, the inspection terminal may contact the cooling plate, making it impossible to properly perform an insulation inspection. Also, in such a battery assembly, it is conceivable to avoid contact between the inspection terminal and the cooling plate by disposing a receiving member between the extension portion of the laminate film and the cooling plate. However, it is structurally difficult to dispose the receiving member in such a manner.

[0015] Further, for example, it is conceivable to fold the extension portion of the laminate film toward the electrode laminate and pierce the inspection terminal into the extension portion of the laminate film from the side of the side surface of the battery to contact the metal layer. However, as illustrated in FIG. 7, even if one tries to practice this method, the side surface portion of the cooling plate becomes an obstacle, making it impossible to reach the inspection terminal to the laminate film.

[0016] The present inventors have found that, as illustrated in FIGS. 1 and 2, by providing a notch or a through-hole 12a in the side surface portion 12 of the cooling plate 10, it is possible to properly perform an insulation inspection of the battery assembly 1 including such a cooling plate 10. That is, as illustrated in FIG. 3, it has been found that the inspection terminal can be pierced into the extension portion 23a of the laminate film 23 through the notch or the through-hole 12a to contact the metal layer.

[0017] Note that FIGS. 1 and 2 illustrate an aspect in which the side surface portion of the cooling plate has a notch. Also, FIGS. 3, 6, and 7 are schematic side views of the battery assembly as viewed from the side of the current collecting terminal.

[0018] As illustrated in FIG. 1, the cooling plate 10 for a battery of the present disclosure has a flat portion 11 and a pair of opposing side portions 12. As illustrated in FIG. 2, the battery 20 can be disposed on the flat portion 11 of the cooling plate 10 to form the battery assembly 1. Further, a plurality of battery assemblies 1 can be housed in a housing to form a battery 20 module. At this time, the pair of side portions 12 of the cooling plate 10 can be brought into contact with the housing or other components housed in the housing. Thereby, the heat generated during charging and discharging of the battery 20 is radiated to other members through the cooling plate 10, and thus the battery 20 is cooled.

[0019] In the cooling plate 10 for a battery of the present disclosure, a notch or a through hole 12a is formed in the side portion 12. By adopting such a configuration, when an insulation inspection is performed on the battery assembly 1 including the cooling plate 10 for a battery of the present disclosure, the side portion 12 of the cooling plate 10 can be made less likely to become an obstacle to the insulation inspection.

[0020] As described above, the side portion of the cooling plate has a function of transferring the heat generated during charging and discharging of the battery to other members. The shape, size, etc. of the notch or the through hole are not particularly limited, and can be appropriately designed in consideration of the ease of passage of the inspection terminal when performing an insulation inspection of the battery assembly and the necessary heat transfer area, etc.

[0021] Note that FIG. 1 illustrates a mode in which the notch or the through hole 12a is formed at both ends of the side portion 12 of the cooling plate 10, but the notch or the through hole 12a may be present at at least one location.

[0022] In the cooling plate 10 for a battery of the present disclosure, the notch or the through hole 12a may be formed at at least one end of the side portion 12. In a solid-state battery, particularly an all-solid-state battery, the moisture permeation standard is strict. By adopting the above-described configuration, the hole formed by piercing the inspection terminal into the extending portion 23a of the laminate film 23 through the notch or the through hole 12a can be separated from the electrode portion of the battery 20, and thus the influence of moisture on the electrode portion can be reduced.

[0023] Regarding the present disclosure, the "solid battery" means a battery that uses at least a solid electrolyte as an electrolyte. Therefore, the solid battery may use a combination of a solid electrolyte and a liquid electrolyte as the electrolyte. Further, the solid battery of the present disclosure may be an all-solid battery, that is, a battery that uses only a solid electrolyte as the electrolyte.

[0024] As illustrated in FIG. 1, in the battery cooling plate 10 of the present disclosure, the notch or through hole 12a may be formed at both ends of the side surface portion 12. With such a configuration, in the inspection method of the battery assembly described later, when two inspection terminals are pierced into the extending portion 23a of the laminate film 23 and brought into contact with the metal layer to confirm the conduction between the two inspection terminals, the two holes formed in the extending portion 23a of the laminate film 23 can both be kept away from the electrode portion of the battery 20, and thus the influence of moisture on the electrode portion can be reduced.

[0025] Regarding the present disclosure, the "end portion" of the side surface portion of the battery cooling plate means a region where the distance from the end of the long side direction of the side surface portion is within a predetermined range. The predetermined range can be determined in consideration of the shape and size of the electrode portion in the battery.

[0026] At least a part of the flat portion and the side surface portion of the battery cooling plate of the present disclosure may be made of a high thermal conductivity material, and in particular, the entire cooling plate may be made of a high thermal conductivity material. The high thermal conductivity material may be a metal such as stainless steel, silver, copper, gold, aluminum, nickel, platinum, etc., and in particular, it may be aluminum.

[0027] The battery that constitutes the battery assembly described later is disposed on the flat portion. The shape and size of the flat portion are not particularly limited, and can be appropriately designed in consideration of the shape and size of the battery.

[0028] The side surface has functions of transferring heat from the battery to other members, protecting the battery, and serving as a guide for arranging other members. The shape, size, etc. of the side surface other than the portion where the notch or through-hole is formed are not particularly limited and can be appropriately designed in consideration of the above functions of the side surface.

[0029] 《Battery Assembly》 As illustrated in FIG. 2, the battery assembly 1 of the present disclosure includes the cooling plate 10 for a battery of the present disclosure and the battery 20 disposed on the flat surface portion 11 of the cooling plate 10 for a battery. The battery 20 in the battery assembly 1 of the present disclosure has an electrode laminate 21, a current collector terminal 22 electrically connected to the current collecting portion of the electrode laminate 21, and a laminate film 23 that seals the electrode laminate 21. The laminate film 23 has a fused resin layer, a metal layer, a protective resin layer, and an extending portion 23a extending to the periphery of the electrode laminate 21. The extending portion 23a is bent toward the electrode laminate 21, and the cooling plate 10 for a battery is disposed such that the side surface portion 12 of the cooling plate 10 for a battery faces the bent extending portion 23a.

[0030] As described above, the present inventors have found that when performing an insulation inspection of such a battery assembly 1, the inspection terminal can be pierced through the notch or through-hole 12a into the extending portion 23a of the laminate film 23 to contact the metal layer.

[0031] The battery assembly 1 of the present disclosure includes the cooling plate 10 for a battery of the present disclosure and the battery 20 disposed on the flat surface portion 11 of the cooling plate 10 for a battery.

[0032] 〈Cooling Plate for Battery〉 Regarding the cooling plate 10 for a battery of the present disclosure, reference can be made to the above description regarding the cooling plate 10 for a battery of the present disclosure.

[0033] 〈Battery〉 The battery 20 has an electrode laminate 21, a current collector terminal 22 electrically connected to the current collecting portion of the electrode laminate 21, and a laminate film 23 that seals the electrode laminate 21.

[0034] The laminate film 23 has a fusion resin layer, a metal layer, a protective resin layer, and an extension portion 23a extending to the periphery of the electrode laminate 21. Here, the metal layer is disposed for the purpose of shielding moisture and the like. Since the laminate film has a metal layer, a short circuit may occur between the metal layer and the current collector terminal and between the metal layer and the cooling plate. Therefore, the present inventors have devised to inspect the presence or absence of these short circuits by the inspection method of the battery assembly described later.

[0035] The extension portion 23a is bent toward the electrode laminate 21, and the battery cooling plate 10 is disposed such that the side surface portion 12 of the battery cooling plate 10 faces the bent extension portion 23a. With such a configuration, in the inspection method of the battery assembly described later, it is possible to perform the inspection so that the inspection terminal and the cooling plate do not come into contact with each other. Note that the extension portion may be formed by a fusion end portion where the fusion resin layers at the ends of the laminate film are fused to each other.

[0036] Hereinafter, the elements constituting the battery of the present disclosure will be described.

[0037] (Electrode laminate) The electrode laminate 21 functions as a power generation element of the battery. The shape of the electrode laminate is not particularly limited. For example, it may have a top surface portion, a bottom surface portion facing the top surface portion, and four side surface portions connecting the top surface portion and the bottom surface portion. The shape of the top surface portion is not particularly limited, and examples thereof include quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram. Further, the shape of the top surface portion may be a polygon other than a quadrilateral, or a shape having a curve such as a circle. Also, the shape of the bottom surface portion is the same as that of the top surface portion. The shape of the side surface portion is not particularly limited, and examples thereof include quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram.

[0038] The electrode laminate may have a negative electrode current collector, a negative electrode active material layer, an electrolyte layer, a positive electrode active material layer, and a positive electrode current collector in this order.

[0039] (Current collector terminal) The current collector terminal 22 is electrically connected to the current collecting portion of the electrode laminate 21. The material of the current collector terminal is not particularly limited as long as it has a current collecting function, and examples thereof include copper and aluminum. The current collector terminal may be disposed on a pair of opposing side surfaces of the electrode laminate. The shape, size, etc. of the current collector terminal are not particularly limited. The current collector terminal may seal the electrode laminate together with the laminate film.

[0040] (Laminate film) The laminate film 23 seals the electrode laminate 21. The laminate film 23 may seal the electrode laminate 21 together with the current collector terminal 22. Specifically, the laminate film may wind the electrode laminate and the current collector terminal and seal the electrode laminate together with the current collector terminal. Further, the laminate film may be composed of a first and a second film, and in this case, the first and second films may sandwich the electrode laminate and the current collector terminal from above and below in the stacking direction of the electrode laminate and seal the electrode laminate together with the current collector terminal.

[0041] The laminate film may have, in this order along the thickness direction, a fusion resin layer, a metal layer, and a protective resin layer. Examples of the material of the fusion resin layer include olefin resins such as polypropylene (PP) and polyethylene (PE). Examples of the material of the metal layer include aluminum, aluminum alloy, and stainless steel. Examples of the material of the protective resin layer include polyethylene terephthalate (PET) and nylon.

[0042] The battery may be a lithium-ion secondary battery. Examples of the uses of the battery include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), gasoline vehicles, and diesel vehicles. In particular, it is preferably used as a driving power source for a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a battery electric vehicle (BEV). Further, the battery in the present disclosure may be used as a power source for a moving body other than a vehicle (for example, a railway, a ship, an aircraft), or may be used as a power source for an electrical product such as an information processing device.

[0043] 《Method for Inspecting Battery Assembly》 The method of the present disclosure for inspecting a battery assembly includes the following steps: (a) passing a first inspection terminal 100 through a notch or through hole 12a of the cooling plate 10 for the battery of the present disclosure and piercing the extended portion 23a of the laminate film 23 to contact the metal layer; (b) contacting a second inspection terminal 200 with the current collecting terminal 22 and evaluating the conductivity between the first inspection terminal 100 and the second inspection terminal 200 to evaluate the presence or absence of a short circuit between the metal layer and the current collecting terminal 22; and (c) contacting a third inspection terminal 300 with the cooling plate 10 for the battery and evaluating the conductivity between the first inspection terminal 100 and the third inspection terminal 300 to evaluate the presence or absence of a short circuit between the metal layer and the cooling plate 10 for the battery.

[0044] As illustrated in FIG. 3, the method of the present disclosure includes (a) passing a first inspection terminal 100 through a notch or through hole 12a of the cooling plate 10 for the battery of the present disclosure and piercing the extended portion 23a of the laminate film 23 to contact the metal layer. The method of the present disclosure may include inserting a receiving member 400 between the bent extended portion 23a and the other portion of the laminate film 23. According to such a method, it is easy to pierce the first inspection terminal 100 into the extended portion 23a. Further, for example, by passing the first inspection terminal 100 through the extended portion 23a and piercing the receiving member, the first inspection terminal 100 is held by the receiving member, and as a result, it is easy to avoid the first inspection terminal 100 from contacting a component other than the component to be inspected.

[0045] Note that FIG. 3(a) illustrates a mode in which the extending portion 23a of the laminate film 23 is bent to the opposite side of the battery cooling plate 10, and FIG. 3(b) illustrates a mode in which the extending portion 23a of the laminate film 23 is bent to the side of the battery cooling plate 10. For example, by extending the notch 12a formed in the side surface portion 12 of the battery cooling plate 10 to a part of the flat surface portion 10 of the battery cooling plate 10, the receiving member 400 can be inserted in the mode shown in FIG. 3(b), and step (a) can be carried out.

[0046] The first inspection terminal 100 is not particularly limited and may be, for example, a probe. In particular, it may be a needle-shaped probe so that it can pierce the extending portion 23a of the laminate film 23.

[0047] The method of the present disclosure includes (b) bringing the second inspection terminal 200 into contact with the current collecting terminal 22 and evaluating the conduction between the first inspection terminal 100 and the second inspection terminal 200 to evaluate the presence or absence of a short circuit between the metal layer and the current collecting terminal 22. For this evaluation, the first inspection terminal 100 and the second inspection terminal 200, and a device connected to each of these inspection terminals and capable of evaluating electrical characteristics can be used. Specifically, for example, when a predetermined voltage is applied to the first inspection terminal 100 and the second inspection terminal 200, the insulation resistance between the metal layer and the current collecting terminal 22 is measured, and when the insulation resistance is smaller than a predetermined reference value, it is determined that a short circuit has occurred between the metal layer and the current collecting terminal 22. In addition, when a predetermined voltage is applied to the first inspection terminal 100 and the second inspection terminal 200, the withstand voltage between the metal layer and the current collecting terminal 22 is measured, and when dielectric breakdown occurs, it is determined that a short circuit has occurred between the metal layer and the current collecting terminal 22.

[0048] Note that the evaluation of the presence or absence of a short circuit between the metal layer and the current collecting terminal 22 can be carried out between the metal layer and either the positive electrode current collecting terminal 22 or the negative electrode current collecting terminal 22.

[0049] The second inspection terminal 200 is not particularly limited and may be, for example, a probe.

[0050] The method of the present disclosure includes (c) bringing a third inspection terminal 300 into contact with the battery cooling plate 10 and evaluating the conductivity between the first inspection terminal 100 and the third inspection terminal 300 to evaluate the presence or absence of a short circuit between the metal layer and the battery cooling plate 10. This evaluation can be performed in the same manner as in step (b).

[0051] The third inspection terminal 300 is not particularly limited and may be, for example, a probe.

[0052] As illustrated in FIG. 4, the method of the present disclosure may further include the following steps before step (a): piercing two first inspection terminals 100 into the extending portion 23a of the laminate film 23 at different positions to contact the metal layer, and confirming the conductivity between the two first inspection terminals 100; contacting two second inspection terminals 200 with the current collecting terminals 22 at different positions, and confirming the conductivity between the two second inspection terminals 200; and contacting two third inspection terminals 300 with the battery cooling plate 10 at different positions, and confirming the conductivity between the two third inspection terminals 300. Note that FIG. 4 is a schematic plan view showing a state in which two first to third inspection terminals are brought into contact with the battery assembly illustrated in FIG. 2.

[0053] For example, when the first to third inspection terminals are not in contact with the members to be inspected, it is not possible to appropriately evaluate the presence or absence of a short circuit between the members. In this regard, by including the method as described above, it is possible to confirm in advance that each inspection terminal is in contact with the member to be inspected.

[0054] As a method for confirming the continuity between each of the first to third inspection terminals, a method of using a device connected to each inspection terminal and capable of evaluating electrical characteristics is exemplified. Specifically, for example, when a predetermined voltage is applied between the first inspection terminals 100, the insulation resistance between the metal layers of the laminate film 23 is measured, and when the insulation resistance is smaller than a predetermined reference value, it is determined that there is continuity between the metal layers. The same method can be adopted as a method for confirming the continuity between the second and third inspection terminals 300. In addition, when confirming the continuity between the second inspection terminals 200, two second inspection terminals can be brought into contact with each of the positive electrode current collector terminal and the negative electrode current collector terminal.

[0055] 《Battery Assembly after Inspection》 The battery assembly after inspection is the battery assembly 1 after being inspected by the inspection method of the battery assembly of the present disclosure, and has a hole formed by the first inspection terminal 100 piercing the extending portion 23a of the laminate film 23 of the battery 20. Regarding the inspection method of the battery assembly of the present disclosure, reference can be made to the above description regarding the inspection method of the battery assembly of the present disclosure.

[0056] 《Battery Module》 The battery module has the battery assembly 1 of the present disclosure and a housing that houses the battery assembly 1. The battery module may be configured by the battery assembly of the present disclosure after being inspected by the inspection method of the battery assembly of the present disclosure. The number of the battery assemblies of the present disclosure in the battery module is not particularly limited. In the battery module, at least one battery assembly may be the battery assembly of the present disclosure. In particular, in the battery module, all the battery assemblies may be the battery assemblies of the present disclosure. Regarding the battery assembly of the present disclosure, reference can be made to the above description regarding the battery assembly of the present disclosure. Regarding the inspection method of the battery assembly of the present disclosure, reference can be made to the above description regarding the inspection method of the battery assembly of the present disclosure.

Description of Reference Numerals

[0057] 1 Battery assembly 10 Cooling plate for battery 11 Flat portion 12 Side portion 12a Notch or through-hole 20 Battery 21 Electrode laminate 22 Current collector terminal 23 Laminate film 23a Extension portion 100 First inspection terminal 200 Second inspection terminal 300 Third inspection terminal

Claims

1. A cooling plate for a battery, having a flat portion and a pair of opposing side portions, wherein a notch or a through hole is formed in the side portion, the cooling plate for a battery.

2. The cooling plate for a battery according to claim 1, wherein the notch or the through hole is formed at at least one end of the side portion.

3. A battery assembly including the cooling plate for a battery according to claim 1 or 2, and a battery disposed on the flat portion of the cooling plate for a battery, wherein the battery has an electrode laminate, a current collecting terminal electrically connected to a current collecting portion of the electrode laminate, and a laminate film sealing the electrode laminate, the laminate film has a fusion resin layer, a metal layer, and a protective resin layer, and an extending portion extending to a peripheral edge of the electrode laminate, the extending portion is bent toward the electrode laminate, and the cooling plate for a battery is disposed such that the side portion of the cooling plate for a battery faces the bent extending portion. The battery assembly.

4. An inspection method for the battery assembly according to claim 3, including the following steps: (a) Inserting a first inspection terminal through the notch or the through hole of the cooling plate for a battery according to claim 1 or 2 and piercing the extending portion of the laminate film to contact the metal layer, (b) Contacting a second inspection terminal with the current collecting terminal, evaluating the electrical continuity between the first inspection terminal and the second inspection terminal, and evaluating the presence or absence of a short circuit between the metal layer and the current collecting terminal, and (c) Contacting a third inspection terminal with the cooling plate for a battery, evaluating the electrical continuity between the first inspection terminal and the third inspection terminal, and evaluating the presence or absence of a short circuit between the metal layer and the cooling plate for a battery.

5. The method according to claim 4, further including the following steps before step (a): Piercing two of the first inspection terminals into the extending portion of the laminate film at different positions to contact the metal layer, and confirming the electrical continuity between the two first inspection terminals, contacting two of the second inspection terminals with the current collecting terminal at different positions, and confirming the electrical continuity between the two second inspection terminals, and contacting two of the third inspection terminals with the cooling plate for a battery at different positions, and confirming the electrical continuity between the two third inspection terminals.

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