Cooling plate for battery, battery assembly and inspection method thereof

Abstract

The invention relates to a cooling plate for a battery, a battery assembly and an inspection method thereof. A cooling plate for a battery according to the present disclosure has a flat surface portion and a pair of opposing side surface portions. In the cooling plate for the battery, a notch or a through hole is formed in a side surface part. A battery assembly according to the present disclosure is provided with a battery cooling plate, and a battery disposed on a planar portion of the battery cooling plate. A battery in a battery assembly has an electrode laminate, a collector terminal, and a laminated film. The laminated film has a welding resin layer, a metal layer, a protective resin layer, and an extending portion. The protruding portion is bent toward the electrode laminate, and the battery cooling plate is disposed such that a side surface portion of the battery cooling plate faces the bent protruding portion.

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] There is known a battery having an electrode laminate, a current collecting terminal electrically connected to a current collecting portion of the electrode laminate, and a laminated film that seals the electrode laminate. Such a battery generates heat during charge and discharge, and there is a case where the battery performance deteriorates due to such heat generation. This problem is particularly significant in a battery module formed of a plurality of batteries. Therefore, a method for promoting heat dissipation of the battery module has been developed.

[0003] International Publication No. 2015 / 019429 discloses a battery module having a plurality of heat dissipation plates (cooling plates), a laminated battery disposed between the heat dissipation plates, and a box body that houses the laminated battery and the heat dissipation plates.

[0004] In International Publication No. 2015 / 019429, the heat dissipation plate has a contact portion with both ends bent and a flat portion, and is arranged in such a manner that the contact portion is closely attached to the side surface of the box body and the flat portion is closely attached to the surface of the laminated battery having a large width. Thus, heat generated during charge and discharge of the laminated battery is transferred to the box body side, and each single battery is cooled. Summary of the Invention

[0005] However, insulation needs to be ensured between the respective metal materials constituting a battery assembly formed by assembling a battery and a cooling plate (referred to as a heat dissipation plate in International Publication No. 2015 / 019429). Specifically, between the metal layer of the laminated film and the current collecting terminal, and between the metal layer and the cooling plate. The present disclosure's applicants, etc., proposed a scheme for performing an insulation inspection to evaluate the presence or absence of a short circuit between the respective metal materials constituting such a battery assembly. However, the present disclosure's applicants, etc., found that the cooling plate becomes an obstacle to such an insulation inspection.

[0006] An object of the present disclosure is to provide a cooling plate for a battery that is not easily an obstacle to insulation inspection, a battery assembly equipped with such a cooling plate for a battery, and an inspection method thereof.

[0007] The present disclosure's applicants, etc., found that the above problems can be solved by the following measures.

[0008] <Mode 1>

[0009] A cooling plate for a battery, having a flat portion and a pair of opposing side portions, wherein a cutout or a through hole is formed in the side portion.

[0010] <Mode 2>

[0011] The cooling plate for a battery as described in Mode 1, wherein the cutout or through hole is formed at at least one end of the side surface portion.

[0012] <Mode 3>

[0013] A battery assembly equipped with the cooling plate for a battery as described in Mode 1 or Mode 2, and a battery disposed on the flat surface portion of the cooling plate for a battery, wherein,

[0014] The battery has an electrode laminate, a current collecting terminal electrically connected to the current collecting portion of the electrode laminate, and a laminated film that seals the electrode laminate.

[0015] The laminated film has a welding resin layer, a metal layer, a protective resin layer, and a protruding portion that protrudes from the periphery of the electrode laminate.

[0016] The protruding portion is bent toward the electrode laminate, and,

[0017] The cooling plate for a battery is arranged such that the side surface portion of the cooling plate for a battery faces the bent protruding portion.

[0018] <Mode 4>

[0019] An inspection method for the battery assembly as described in Mode 3, which includes the following steps:

[0020] (a) Insert a first inspection terminal through the cutout or through hole of the cooling plate for a battery as described in Mode 1 or Mode 2 into the protruding portion of the laminated film to contact the metal layer.

[0021] (b) Bring a second inspection terminal into contact with the current collecting terminal, evaluate the conduction between the first inspection terminal and the second inspection terminal, and evaluate whether there is a short circuit between the metal layer and the current collecting terminal, and

[0022] (c) Bring a third inspection terminal into contact with the cooling plate for a battery, evaluate the conduction between the first inspection terminal and the third inspection terminal, and evaluate whether there is a short circuit between the metal layer and the cooling plate for a battery.

[0023] <Mode 5>

[0024] The method as described in Mode 4, wherein, before the step (a), the following step is further included:

[0025] Insert two of the first inspection terminals into the protruding portion of the laminated film at mutually different positions to contact the metal layer, and confirm the conduction between the two first inspection terminals.

[0026] The two second inspection terminals are brought into contact with the current collector terminal at mutually different positions, and conduction between the two second inspection terminals is confirmed, and

[0027] The two third inspection terminals are brought into contact with the battery cooling plate at mutually different positions, and conduction between the two third inspection terminals is confirmed.

[0028] According to the present disclosure, a battery cooling plate that is not likely to be an obstacle to insulation inspection, a battery assembly equipped with such a battery cooling plate, and an inspection method thereof can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The features, advantages, and technical and industrial significance of the embodiments of the present invention will be described below with reference to the drawings, in which like reference numerals denote like components, wherein:

[0030] Figure 1 is a schematic perspective view showing an example of the battery cooling plate of the present disclosure.

[0031] Figure 2 is a schematic perspective view showing an example of the battery assembly of the present disclosure.

[0032] Figure 3A is a schematic side view showing an example of an inspection method of a battery assembly equipped with the battery cooling plate of the present disclosure.

[0033] Figure 3B is a schematic side view showing an example of an inspection method of a battery assembly equipped with the battery cooling plate of the present disclosure.

[0034] Figure 4 is a schematic plan view showing an example of an inspection method of a battery assembly equipped with the battery cooling plate of the present disclosure.

[0035] Figure 5 is a schematic perspective view showing an example of a battery cooling plate according to the prior art.

[0036] Figure 6 is a schematic side view showing an example of an inspection method of a battery assembly equipped with a battery cooling plate according to the prior art.

[0037] Figure 7 is a schematic side view showing an example of an inspection method of a battery assembly equipped with a battery cooling plate according to the prior art. DETAILED DESCRIPTION

[0038] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings. In addition, the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the disclosed subject matter. In addition, the dimensional relationship in each of the drawings does not reflect the actual dimensional relationship.

[0039] 《Cooling plate for battery》

[0040] As in Figure 1 As shown in FIG. 1 , the battery cooling plate 10 of the present disclosure includes a flat surface portion 11 and a pair of opposing side surfaces 12 . In the battery cooling plate 10 of the present disclosure, the side surfaces 12 are provided with cutouts or through holes 12 a .

[0041] The inventors of the present application have found that, for a cooling plate having bent ends, that is, a cooling plate having a flat portion and a pair of opposite side portions, a battery is arranged on the flat portion and between the pair of side portions to form a Figure 2 In the case of the battery assembly exemplified in , the above-mentioned insulation inspection may become difficult.

[0042] Specifically, for example, if you want to Figure 5 In the battery assembly of the exemplary cooling plate having no cutouts or through holes on the side surface, Figure 6 As shown in the example, when the inspection terminal is inserted into the extended portion of the laminate film and contacts the metal layer, there is a case where the inspection terminal contacts the cooling plate and the insulation inspection cannot be properly performed. In addition, in this battery assembly, it is assumed that the contact between the inspection terminal and the cooling plate can be avoided by arranging a receiving member between the extended portion of the laminate film and the cooling plate, but it is structurally difficult to arrange the receiving member in this way.

[0043] In addition, for example, it is conceivable that the extended portion of the laminate film is bent toward the battery stack, and the inspection terminal is inserted into the extended portion of the laminate film from the side of the battery and contacts the metal layer. Figure 7 As exemplified in , even if this method is implemented, the side surface of the cooling plate becomes an obstacle and the inspection terminal cannot reach the laminate film.

[0044] The author of the present application has found that Figure 1 and 2 As shown in the example, by providing the cutout or through hole 12a in the side surface 12 of the cooling plate 10, the insulation inspection of the battery assembly 1 equipped with such a cooling plate 10 can be appropriately performed. Figure 3A , Figure 3B As shown in the example in FIG. 1 , the inspection terminal can be inserted into the extension portion 23 a of the laminate film 23 through the cutout or through-hole 12 a and contact the metal layer.

[0045] in addition,Figure 1 and Figure 2 illustrate a way in which a notch is provided in the side surface portion of the cooling plate. In addition, Figure 3A , Figure 3B , and Figure 6 and Figure 7 are schematic side views of the battery assembly viewed from the side of the current collecting terminal.

[0046] As illustrated in Figure 1 , the battery cooling plate 10 of the present disclosure has a flat portion 11 and a pair of opposing side surface portions 12. As illustrated in Figure 2 , the battery 20 can be arranged 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 box to form a battery module. At this time, the pair of side surface portions 12 of the cooling plate 10 can be brought into contact with the box or other structural members housed in the box. Thus, the heat generated during charging and discharging of the battery 20 is dissipated to other members through the cooling plate 10, and the battery 20 is cooled.

[0047] In the battery cooling plate 10 of the present disclosure, a notch or a through hole 12a is formed in the side surface portion 12. By forming such a structure, in the case of performing an insulation check on the battery assembly 1 equipped with the battery cooling plate 10 of the present disclosure, the side surface portion 12 of the cooling plate 10 is less likely to become an obstacle to the insulation check.

[0048] As described above, the side surface 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 and size of the notch or the through hole are not particularly limited, and can be appropriately designed in consideration of the ease of passing of the inspection terminal during the insulation check of the battery assembly and the necessary heat transfer area, etc.

[0049] In addition, although Figure 1 illustrates a way in which the notch or the through hole 12a is formed at both ends of the side surface portion 12 of the cooling plate 10, as long as the notch or the through hole 12a exists in at least one portion.

[0050] In the battery cooling plate 10 of the present disclosure, the notch or the through hole 12a may also be formed at at least one end of the side surface portion 12. In a solid-state battery, particularly in an all-solid-state battery, the moisture permeation specification is strict. By forming the above-described structure, the hole formed by piercing the protruding portion 23a of the laminated film 23 with the inspection terminal through the notch or the through hole 12a can be made far from the electrode portion of the battery 20, and thus, the influence of moisture on the electrode portion can be reduced.

[0051] In addition, for the present disclosure, a "solid battery" refers to a battery that uses at least a solid electrolyte as an electrolyte. Thus, the solid battery of the present disclosure may also use a combination of a solid electrolyte and a liquid electrolyte as an electrolyte. In addition, the solid battery of the present disclosure may also be an all-solid battery, that is, a battery that uses only a solid electrolyte as an electrolyte.

[0052] As exemplified in Figure 1 in the battery cooling plate 10 of the present disclosure, cuts or through-holes 12a may be formed at both ends of the side surface portion 12. By forming such a structure, in the inspection method of the battery assembly to be described later, when two inspection terminals are inserted into the protruding portion 23a of the laminated film 23 and brought into contact with the metal layer to confirm the conduction between the two inspection terminals, both holes formed in the protruding portion 23a of the laminated film 23 can be kept away from the electrode portion of the battery 20, thereby reducing the influence of moisture on the electrode portion.

[0053] For the present disclosure, the "end portion" of the side surface portion of the battery cooling plate refers to a region where the distance from the end of the long side direction of the side surface portion is within a specified range. The specified range can be determined in consideration of the shape and size of the electrode portion of the battery, etc.

[0054] In the battery cooling plate of the present disclosure, at least a part of the flat portion and the side surface portion can be made of a high thermal conductivity material. In particular, the entire cooling plate can be made of a high thermal conductivity material. As the high thermal conductivity material, it can be a metal such as stainless steel, silver, copper, gold, aluminum, nickel, platinum, etc. In particular, it can be aluminum.

[0055] In the flat portion, the battery that constitutes the battery assembly to be described later is arranged. 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, etc.

[0056] In addition to the function of transferring heat from the battery to other components, the side surface portion also has the function of protecting the battery and the function of serving as a guide for arranging other components. The shape and size of the side surface portion other than the portion where the cuts or through-holes are formed are not particularly limited and can be appropriately designed in consideration of the above various functions of the side surface portion.

[0057] 《Battery Assembly》

[0058] As exemplified in Figure 2As exemplified above, the battery assembly 1 of the present disclosure is equipped with the battery cooling plate 10 of the present disclosure and the battery 20 disposed on the flat surface portion 11 of the battery cooling plate 10. The battery 20 in the battery assembly 1 of the present disclosure has an electrode laminate 21, a current collecting terminal 22 electrically connected to the current collecting portion of the electrode laminate 21, and a laminated film 23 that seals the electrode laminate 21. The laminated film 23 has a welding resin layer, a metal layer, a protective resin layer, and a protruding portion 23a that protrudes from the periphery of the electrode laminate 21. The protruding portion 23a is bent toward the electrode laminate 21, and the battery cooling plate 10 is arranged such that the side surface portion 12 of the battery cooling plate 10 faces the bent protruding portion 23a.

[0059] As described above, the present applicants have found that when performing the insulation inspection of such a battery assembly 1, the inspection terminal can be inserted into the protruding portion 23a of the laminated film 23 through a cut or a through hole 12a to contact the metal layer.

[0060] The battery assembly 1 of the present disclosure is equipped with the battery cooling plate 10 of the present disclosure and the battery 20 disposed on the flat surface portion 11 of the battery cooling plate 10.

[0061] <Battery cooling plate>

[0062] Regarding the battery cooling plate 10 of the present disclosure, reference can be made to the above description of the battery cooling plate 10 of the present disclosure.

[0063] <Battery>

[0064] The battery 20 has an electrode laminate 21, a current collecting terminal 22 electrically connected to the current collecting portion of the electrode laminate 21, and a laminated film 23 that seals the electrode laminate 21.

[0065] The laminated film 23 has a welding resin layer, a metal layer, a protective resin layer, and a protruding portion 23a that protrudes from the periphery of the electrode laminate 21. Here, the metal layer is arranged for the purpose of shielding moisture and the like. Since the laminated film has a metal layer, there is a case where a short circuit occurs between the metal layer and the current collecting terminal, and between the metal layer and the cooling plate. Thus, the present applicants have proposed a scheme for inspecting the presence or absence of these short circuits using the inspection method of the battery assembly to be described later.

[0066] The protruding portion 23a is bent toward the electrode laminate 21, and the battery cooling plate 10 is arranged such that the side surface portion 12 of the battery cooling plate 10 faces the bent protruding portion 23a. By forming such a configuration, in the inspection method of the battery assembly to be described later, the inspection can be performed in such a manner that the inspection terminal does not contact the cooling plate. In addition, the protruding portion may be formed by a welded end portion where the welding resin layers at the ends of the laminated film are welded to each other.

[0067] Next, components constituting the battery of the present disclosure will be described.

[0068] (Electrode laminate)

[0069] The electrode laminate 21 functions as a power generation component 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 opposite to 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. For example, quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram can be cited. In addition, the shape of the top surface portion may also be a polygon other than a quadrilateral, or a shape having a curve such as a circle. In addition, 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. For example, quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram can be cited.

[0070] The electrode laminate sequentially includes 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.

[0071] (Current collecting terminal)

[0072] The current collecting terminal 22 is electrically connected to the current collecting portion of the electrode laminate 21. As the material of the current collecting terminal, as long as it is a material having a current collecting function, there is no particular limitation, and examples include copper and aluminum. The current collecting terminal can be disposed on a pair of opposite side surface portions of the electrode laminate. The shape, size, etc. of the current collecting terminal are not particularly limited. The current collecting terminal may also seal the electrode laminate together with the laminated film.

[0073] (Laminated film)

[0074] The laminated film 23 seals the electrode laminate 21. The laminated film 23 may also seal the electrode laminate 21 together with the current collecting terminal 22. Specifically, the laminated film winds around the electrode laminate and the current collecting terminal and seals the electrode laminate together with the current collecting terminal. In addition, the laminated film may be composed of a first film and a second film. In this case, the first film and the second film may also sandwich the electrode laminate and the current collecting terminal from above and below in the stacking direction of the electrode laminate and seal the electrode laminate together with the current collecting terminal.

[0075] The laminated film may sequentially have a welding resin layer, a metal layer, and a protective resin layer along the thickness direction. As the material of the welding resin layer, for example, olefin resins such as polypropylene (PP) and polyethylene (PE) can be cited. As the material of the metal layer, for example, aluminum, aluminum alloy, and stainless steel can be cited. As the material of the protective resin layer, for example, polyethylene terephthalate (PET) and nylon can be cited.

[0076] The battery may be a lithium-ion secondary battery. As uses of the battery, for example, 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 can be cited. In particular, it is preferably used as a drive power source for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or battery electric vehicles (BEVs). In addition, the battery in the present disclosure can also be used as a power source for moving bodies other than vehicles (e.g., railways, ships, aircraft), and can also be used as a power source for electrical products such as information processing devices.

[0077] "Inspection Method of Battery Assembly"

[0078] The method of the present disclosure for inspecting a battery assembly includes the following steps: (a) inserting a first inspection terminal 100 through a cutout or through-hole 12a of the battery cooling plate 10 of the present disclosure into the protruding portion 23a of the laminated film 23 and contacting the metal layer, (b) contacting a second inspection terminal 200 with the current collecting terminal 22, evaluating the conduction between the first inspection terminal 100 and the second inspection terminal 200, and evaluating whether there is a short circuit between the metal layer and the current collecting terminal 22, and (c) contacting a third inspection terminal 300 with the battery cooling plate 10, evaluating the conduction between the first inspection terminal 100 and the third inspection terminal 300, and evaluating whether there is a short circuit between the metal layer and the battery cooling plate 10.

[0079] As exemplified in Figure 3A , Figure 3B The method of the present disclosure includes: (a) inserting a first inspection terminal 100 through a cutout or through-hole 12a of the battery cooling plate 10 of the present disclosure into the protruding portion 23a of the laminated film 23 and contacting the metal layer. The method of the present disclosure may include inserting a receiving member 400 between the bent protruding portion 23a and other portions of the laminated film 23. According to this method, it is easy to insert the first inspection terminal 100 into the protruding portion 23a. In addition, for example, by passing the first inspection terminal 100 through the protruding portion 23a and inserting it into the receiving member, the first inspection terminal 100 is held by the receiving member, and as a result, it is easy to prevent the first inspection terminal 100 from contacting components other than the component to be inspected.

[0080] In addition, Figure 3A represents a state in which the protruding portion 23a of the laminated film 23 is bent to the opposite side of the battery cooling plate 10, Figure 3B represents a state in which the protruding portion 23a of the laminated film 23 is bent to the side of the battery cooling plate 10. For example, by extending the cutout 12a formed in the side surface portion 12 of the battery cooling plate 10 to a part of the flat surface portion 11 of the battery cooling plate 10, in Figure 3B the state shown, the receiving member 400 can be inserted and step (a) can be implemented.

[0081] The first inspection terminal 100 has no specific limitation. For example, it can be a probe. In particular, it can be a needle-like probe capable of piercing the protruding portion 23a of the laminated film 23.

[0082] The method of the present disclosure includes: (b) bringing the second inspection terminal 200 into contact with the current collecting terminal 22, evaluating the conduction between the first inspection terminal 100 and the second inspection terminal 200, and evaluating whether there is a short circuit between the metal layer and the current collecting terminal 22. In this evaluation, the first inspection terminal 100 and the second inspection terminal 200, and a device connected to each of the above inspection terminals and capable of evaluating electrical characteristics can be used. Specifically, for example, the following methods can be cited: measuring the insulation resistance between the metal layer and the current collecting terminal 22 when a predetermined voltage is applied to the first inspection terminal 100 and the second inspection terminal 200, 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, the following method can be cited: measuring the withstand voltage between the metal layer and the current collecting terminal 22 when a predetermined voltage is applied to the first inspection terminal 100 and the second inspection terminal 200, and when insulation breakdown occurs, it is determined that a short circuit has occurred between the metal layer and the current collecting terminal 22.

[0083] In addition, for the evaluation of whether there is a short circuit between the metal layer and the current collecting terminal 22, it can be carried out between the metal layer and any one of the positive current collecting terminal 22 and the negative current collecting terminal 22.

[0084] The second inspection terminal 200 has no specific limitation. For example, it can be a probe.

[0085] The method of the present disclosure includes: (c) bringing the third inspection terminal 300 into contact with the battery cooling plate 10, evaluating the conduction between the first inspection terminal 100 and the third inspection terminal 300, and evaluating whether there is a short circuit between the metal layer and the battery cooling plate 10. This evaluation can be carried out in the same manner as in step (b).

[0086] The third inspection terminal 300 has no specific limitation. For example, it can be a probe.

[0087] As in Figure 4As exemplified, the method of the present disclosure may further include the following steps before step (a): piercing the protruding portions 23a of the laminated film 23 at different positions with two first inspection terminals 100 to contact the metal layer, and confirming the conduction between the two first inspection terminals 100; bringing two second inspection terminals 200 into contact with the current collecting terminals 22 at different positions, and confirming the conduction between the two second inspection terminals 200; and bringing two third inspection terminals 300 into contact with the battery cooling plate 10 at different positions, and confirming the conduction between the two third inspection terminals 300. In addition, Figure 4 is a schematic plan view showing the state of the battery assembly exemplified Figure 2 in which the two first to third inspection terminals are in contact.

[0088] For example, when the first to third inspection terminals do not contact the member to be inspected, it is not possible to appropriately evaluate whether there is a short circuit between the members. Thus, by including the above method, it is possible to confirm in advance the contact between each inspection terminal and the member to be inspected.

[0089] As a method for confirming the conduction between 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, the following method can be cited: measuring the insulation resistance between the metal layers of the laminated film 23 when a predetermined voltage is applied between the first inspection terminals 100, and when the insulation resistance is smaller than a predetermined reference value, it is determined that conduction occurs between the metal layers. As a method for confirming the conduction between the second and third inspection terminals 200 and 300, the same method can also be adopted. In addition, when confirming the conduction between the second inspection terminals 200, the two second inspection terminals can be brought into contact with each of the positive current collecting terminal and the negative current collecting terminal.

[0090] 《Battery Assembly after Inspection》

[0091] The battery assembly after inspection is the battery assembly 1 inspected by the inspection method of the battery assembly of the present disclosure. In the protruding portion 23a of the laminated film 23 of the battery 20, there are holes formed by piercing with the first inspection terminals 100. For the inspection method of the battery assembly of the present disclosure, reference can be made to the above description of the inspection method of the battery assembly of the present disclosure.

[0092] 《Battery Module》

[0093] The battery module has the battery assembly 1 of the present disclosure and a box body for housing the battery assembly 1. The battery module can be composed of the battery assemblies of the present disclosure that have been inspected by the inspection method for the battery assemblies 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, there can be at least one battery assembly that is the battery assembly of the present disclosure. In particular, in the battery module, all the battery assemblies are the battery assemblies of the present disclosure. For the battery assembly of the present disclosure, reference can be made to the above description of the battery assembly of the present disclosure. For the inspection method for the battery assembly of the present disclosure, reference can be made to the above description of the inspection method for the battery assembly of the present disclosure.

Claims

1. A battery cooling plate, comprising a planar portion and a pair of opposing side portions, wherein: A cutout or a through hole is formed in the side surface portion.

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

3. A battery assembly comprising the battery cooling plate according to claim 1 or 2, and a battery arranged on the flat surface of the battery cooling plate, wherein: The battery comprises an electrode stack, a current collecting terminal electrically connected to a current collecting portion of the electrode stack, and a laminate film sealing the electrode stack. The laminate film includes a welding resin layer, a metal layer, a protective resin layer, and an extension portion extending from the periphery of the electrode stack. The extension portion is bent toward the electrode stack, and The battery cooling plate is arranged such that the side surface portion of the battery cooling plate faces the bent extension portion.

4. A method for inspecting a battery assembly, the method for inspecting the battery assembly according to claim 3, wherein: Including the following processes: (a) inserting a first inspection terminal into the extended portion of the laminate film through the cutout or through-hole of the battery cooling plate according to claim 1 or 2 to contact the metal layer, (b) bringing a second inspection terminal into contact with the collector terminal, evaluating conduction between the first inspection terminal and the second inspection terminal, and evaluating whether there is a short circuit between the metal layer and the collector terminal, and (c) contacting a third inspection terminal with the battery cooling plate to evaluate conduction between the first inspection terminal and the third inspection terminal and to evaluate whether there is a short circuit between the metal layer and the battery cooling plate.

5. The method for inspecting a battery assembly according to claim 4, wherein: Prior to step (a), the method further comprises the following steps: The two first inspection terminals are inserted into the extended portion of the laminate film at different positions to contact the metal layer, and the conduction between the two first inspection terminals is confirmed. making the two second inspection terminals contact the collector terminal at different positions from each other, and confirming the conduction between the two second inspection terminals, and The two third inspection terminals are brought into contact with the battery cooling plate at positions different from each other, and conduction between the two third inspection terminals is checked.

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