Battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module and a battery pack. The battery module comprises a battery pack which comprises a plurality of single batteries; the pole pieces comprise a connecting pole piece and a total pole piece, the connecting pole piece is used for connecting the pole columns of the plurality of single batteries, and the total pole piece is connected with an external device and the connecting pole piece; the end plate assembly is located at the side part of the battery pack, the end plate assembly comprises an end plate body and a cooling structure arranged on the end plate body, the cooling structure is provided with a cooling cavity, and the total pole piece penetrates through the cooling cavity; and the heat conduction structure is arranged in the cooling cavity and is in contact with the total pole piece and the inner wall of the cooling structure. By applying the technical scheme provided by the invention, the problem that the total pole piece of the battery module in the prior art is difficult to dissipate heat can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Art

[0002] The battery pack is an integrated structure composed of multiple battery modules, usually located in the vehicle chassis or under the vehicle seat. It provides physical support and protection for the battery, and also contains connections and interfaces with other vehicle systems.

[0003] At present, when the single cells in the battery pack are connected in series, it is generally necessary to use pole pieces to realize the current convergence of the single cells. Specifically, the pole pieces include connecting pole pieces and main pole pieces. The connecting pole pieces are used to connect multiple single cells in series, and the main pole pieces are used to collect the currents of multiple connecting pole pieces and connect the connecting pole pieces with external devices.

[0004] When the battery pack is charged and discharged at a high rate, the temperature of the total electrode rises rapidly because the current flow of the total electrode is greater than that of the connecting electrode. When the temperature exceeds the safety threshold, it will affect the safety of the battery pack. At present, the main cooling method for the total electrode is natural cooling, which has low heat transfer efficiency and slow cooling speed, resulting in safety risks for the battery pack. Utility Model Content

[0005] The present application provides a battery module and a battery pack, which are used to solve the problem of difficulty in heat dissipation at the total pole piece of the battery module in the related art.

[0006] In one aspect, the present application provides a battery module, comprising:

[0007] A battery pack, comprising a plurality of single cells;

[0008] Electrode pieces, including connecting electrode pieces and total electrode pieces, the connecting electrode pieces are used to connect the poles of multiple single cells, and the total electrode pieces are connected to external devices and the connecting electrode pieces;

[0009] The end plate assembly is located at the side of the battery pack, and the end plate assembly includes an end plate body and a cooling structure arranged on the end plate body, wherein the cooling structure has a cooling cavity, and the total pole piece is arranged through the cooling cavity;

[0010] The heat-conducting structure is arranged in the cooling cavity and contacts the total pole piece and the inner wall of the cooling structure.

[0011] In some embodiments, the heat-conducting structure includes a heat-conducting block, and the heat conductivity of the heat-conducting block is greater than the heat conductivity of air;

[0012] and / or,

[0013] The thermal conductivity of the end plate body and / or the cooling structure is greater than the thermal conductivity of air.

[0014] In some embodiments, the cooling structure includes a first mounting portion and a second mounting portion that are connected to each other, the first mounting portion is connected to the end plate body, the second mounting portion has a cooling cavity, and the total pole piece is inserted into the second mounting portion.

[0015] In some embodiments, the second mounting portion includes a mounting frame and a cover plate covered on the mounting frame, the cover plate and the mounting frame form a cooling cavity, the mounting frame includes two oppositely arranged side walls, the two oppositely arranged side walls are respectively provided with mounting holes, and the total pole piece is passed through the two mounting holes.

[0016] In some embodiments, the cooling structure further includes an insulating fixing sleeve, and the insulating fixing sleeve is interference-interference-disposed between the total pole piece and the mounting hole.

[0017] In some embodiments, the first mounting portion includes a base, the mounting frame is located at one end of the base away from the end plate body, a first mounting hole is provided in the base, a second mounting hole is provided on the total pole piece, and the cooling structure further includes a first fastener, and the first fastener is inserted into the first mounting hole and the second mounting hole;

[0018] The base also includes a third mounting hole, the end plate body is provided with a fourth mounting hole, and the cooling structure also includes a second fastener, which is passed through the third mounting hole and the fourth mounting hole.

[0019] In some embodiments, the base includes a base body and a threaded sleeve, the base body has a mounting groove, the threaded sleeve is located in the mounting groove and connected to the bottom wall of the mounting groove, and the threaded hole in the threaded sleeve forms a first mounting hole.

[0020] The installation frame is set at the notch of the installation slot.

[0021] The first fastener presses the main pole piece onto the threaded sleeve.

[0022] The third mounting hole is arranged on the bottom wall of the mounting groove.

[0023] In some embodiments, the cooling structure further includes an insulating gasket, which is disposed between the total pole piece and the threaded sleeve to insulate the total pole piece from the threaded sleeve.

[0024] In some embodiments, the total electrode sheet includes a total positive electrode sheet and a total negative electrode sheet, and the connecting electrode sheet includes a positive electrode connecting electrode sheet and a negative electrode connecting electrode sheet;

[0025] The positive electrode connecting plate is used to connect the positive poles of multiple single cells in series, and the total positive electrode plate is connected to the external device and the positive electrode connecting plate;

[0026] The negative electrode connecting plate is used to connect the negative poles of multiple single cells in series, and the total negative electrode plate is connected to the external device and the negative electrode connecting plate;

[0027] The cooling structure includes a plurality of cooling structures, each of which is provided with a total positive electrode sheet or a total negative electrode sheet.

[0028] On the other hand, the present application provides a battery pack, comprising the above-mentioned battery module.

[0029] The battery module provided by the present application includes a battery pack, an end plate assembly and a heat-conducting structure. The end plate assembly is arranged on the side of the battery pack, which can protect the battery pack, and can also improve the strength of the battery module and enhance the safety of the battery module. Since the end plate assembly is located on the side of the battery pack, the position of the end plate assembly can just be the extension position of the total pole piece in the pole piece. Therefore, the position of the total pole piece can be set close to the end plate assembly, and the setting position of the cooling structure is determined with reference to the position of the total pole piece, thereby realizing the cooling of the total pole piece. This embodiment improves the end plate assembly, and sets the end plate assembly in a form including an end plate body and a cooling structure, and utilizes the position of the end plate assembly to provide assistance for the heat dissipation of the total pole piece. Specifically, the cooling structure is connected to the end plate body, and the cooling structure has a cooling cavity inside, so that the total pole piece passes through the cooling cavity, and then a heat-conducting structure with good thermal conductivity is arranged in the cooling cavity, and the heat on the total pole piece is quickly extracted through the contact between the heat-conducting structure and the total pole piece, thereby improving the heat dissipation effect of the total pole piece, thereby ensuring the safety of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0031] Figure 1 A schematic diagram of the three-dimensional structure of a battery module provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a partial structure of a battery module provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of the three-dimensional structure of the cooling structure of the battery module provided in an embodiment of the present application;

[0034] Figure 4 A schematic diagram of the exploded structure of the cooling structure of the battery module provided in an embodiment of the present application;

[0035] Figure 5 A partial structural schematic diagram of the cooling structure of the battery module provided in an embodiment of the present application, wherein: Figure 5 A schematic diagram showing the structure of the second mounting member and the total pole piece assembly is shown;

[0036] Figure 6 A schematic structural diagram of the second mounting portion of the cooling structure of the battery module provided in an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 10. Battery module;

[0039] 100. Battery pack;

[0040] 200, pole piece; 210, connecting pole piece; 220, total pole piece; 221, second mounting hole;

[0041] 300. End plate body;

[0042] 400. Cooling structure;

[0043] 410, first mounting portion; 411, base body; 412, threaded sleeve; 4121, first mounting hole; 413, support portion;

[0044] 420, second mounting portion; 421, mounting frame; 4211, side wall; 4212, through hole; 422, cover plate; 423, cooling chamber;

[0045] 430, insulating fixing sleeve;

[0046] 440, first fastener;

[0047] 450, second fastener;

[0048] 460, insulating gasket;

[0049] 500. Thermal conductive structure. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] At present, when the single cells in the battery pack are connected in series, it is generally necessary to use pole pieces to realize the current convergence of the single cells. Specifically, the pole pieces include connecting pole pieces and main pole pieces. The connecting pole pieces are used to connect multiple single cells in series, and the main pole pieces are used to collect the currents of multiple connecting pole pieces and connect the connecting pole pieces with external devices.

[0052] When the battery pack is charged and discharged at a high rate, the temperature of the total electrode rises rapidly because the current flow of the total electrode is greater than that of the connecting electrode. When the temperature exceeds the safety threshold, it will affect the safety of the battery pack. At present, the main cooling method for the total electrode is natural cooling, which has low heat transfer efficiency and slow cooling speed, resulting in safety risks for the battery pack.

[0053] In view of this, the present embodiment provides a battery module, which includes a battery pack and an end plate assembly. By improving the structure of the end plate assembly, the end plate assembly includes an end plate body and a cooling structure. A heat-conducting structure is arranged in the cooling structure. The total pole piece can extend into the cooling structure and contact with the heat-conducting structure. The heat-conducting structure can quickly dissipate the heat generated by the total pole piece, thereby enabling the total pole piece to achieve a rapid heat dissipation effect, thereby reducing the safety risk of the battery pack.

[0054] The battery module and battery pack provided in the embodiment of the present application are described below in conjunction with the accompanying drawings. It should be noted that the battery module in the embodiment of the present application can be charged and discharged and recycled, and the specific type of the single battery in the battery module can include but is not limited to lithium batteries, etc., and the battery module can be used in scenarios including but not limited to electronic products, energy storage equipment, transportation vehicles, etc., such as mobile communication equipment, new energy vehicles, drones, etc., which are not specifically limited in the embodiment of the present application.

[0055] Figure 1 A schematic diagram of the three-dimensional structure of a battery module provided in an embodiment of the present application; Figure 2 A schematic diagram of a partial structure of a battery module provided in an embodiment of the present application; Figure 3 A schematic diagram of the three-dimensional structure of the cooling structure of the battery module provided in an embodiment of the present application; Figure 5 A partial structural schematic diagram of the cooling structure of the battery module provided in an embodiment of the present application, wherein: Figure 5 A schematic structural diagram of the assembly of the second mounting member and the total pole piece is shown.

[0056] like Figures 1 to 3 as well as Figure 5 As shown, the battery module 10 of this embodiment includes: a battery pack 100 , a pole piece 200 , an end plate assembly and a heat-conducting structure 500 .

[0057] Among them, the battery pack 100 includes multiple single cells; the pole piece 200 includes a connecting pole piece 210 and a total pole piece 220, the connecting pole piece 210 is used to connect the poles of multiple single cells, and the total pole piece 220 connects an external device with the connecting pole piece 210; the end plate assembly is located on the side of the battery pack 100, the end plate assembly includes an end plate body 300 and a cooling structure 400 arranged on the end plate body 300, the cooling structure 400 has a cooling cavity 423, and the total pole piece 220 is penetrated through the cooling cavity 423; the heat conductive structure 500 is arranged in the cooling cavity 423 and contacts with the inner walls of the total pole piece 220 and the cooling structure 400.

[0058] By applying the technical solution of this embodiment, the end plate assembly is arranged on the side of the battery pack 100, which can protect the battery pack 100, and can also improve the strength of the battery module and enhance the safety of the battery module. Since the end plate assembly is located on the side of the battery pack 100, the position of the end plate assembly can just be the extension position of the total pole piece 220 in the pole piece 200. Therefore, the position of the total pole piece 220 can be set close to the end plate assembly, and the setting position of the cooling structure 400 can be determined with reference to the position of the total pole piece 220, thereby realizing the cooling of the total pole piece 220. This embodiment improves the end plate assembly, and sets the end plate assembly to include an end plate body 300 and a cooling structure 400, and utilizes the position of the end plate assembly to provide assistance for the heat dissipation of the total pole piece 200. Specifically, the cooling structure 400 is connected to the end plate body 300, and a cooling cavity 423 is provided inside the cooling structure 400, so that the total pole piece 200 passes through the cooling cavity 423, and then a heat-conducting structure 500 with good thermal conductivity is arranged in the cooling cavity. The heat on the total pole piece 220 is quickly discharged to the end plate assembly through the contact between the heat-conducting structure 500 and the total pole piece 200. Compared with the natural heat dissipation of the total pole piece 220, the heat dissipation effect of the total pole piece 220 is improved, and the design of the cooling structure 400 is simple and reliable, thereby ensuring the safety of the battery module.

[0059] It should be noted that the total electrode sheet 220 includes a total positive electrode sheet and a total negative electrode sheet, and the connecting electrode sheet 210 includes a positive connecting electrode sheet and a negative connecting electrode sheet; the positive connecting electrode sheet is used to connect the positive electrode columns of multiple single batteries in series, and the total positive electrode sheet connects an external device with the positive connecting electrode sheet; the negative connecting electrode sheet is used to connect the negative electrode columns of multiple single batteries in series, and the total negative electrode sheet connects an external device with the negative connecting electrode sheet; the cooling structure includes multiple cooling structures, and each cooling structure is provided with a total positive electrode sheet or a total negative electrode sheet, so as to realize cooling and heat dissipation of the total positive electrode sheet and the total negative electrode sheet.

[0060] Furthermore, if Figure 3 and Figure 5As shown, in some embodiments, the heat-conducting structure 500 includes a heat-conducting block, and the heat conductivity of the heat-conducting block is greater than the heat conductivity of air. Therefore, the heat-conducting block is in contact with the total pole piece 220, which can effectively improve the heat dissipation effect of the total pole piece 220 compared to the natural heat dissipation of the total pole piece 220 (the total pole piece 220 is in contact with the air), thereby reducing the risk of thermal runaway of the battery module.

[0061] Exemplarily, the material of the heat conductive block can be thermal grease. On the one hand, thermal grease has good thermal conductivity, and on the other hand, thermal grease has good elasticity. It can be filled in the cooling cavity through extrusion deformation to ensure the close contact with the total pole piece 220, thereby ensuring the cooling effect on the total pole piece 220.

[0062] In order to further improve the heat dissipation effect of the battery module, such as Figure 1 and Figure 3 As shown, in some embodiments, the thermal conductivity of the end plate body 300 and the cooling structure 400 may also be made of a material with good thermal conductivity, such as Q235 or aluminum alloy, which is greater than the thermal conductivity of air.

[0063] Figure 4 The schematic diagram of the decomposition structure of the cooling structure of the battery module provided in the embodiment of the present application is as follows: Figure 3 and Figure 4 As shown, in some embodiments, the cooling structure 400 includes a first mounting portion 410 and a second mounting portion 420 that are interconnected, the first mounting portion 410 is connected to the end plate body 300 , the second mounting portion 420 has a cooling cavity 423 , and the total pole piece 220 is inserted into the second mounting portion 420 .

[0064] In the above structure, the function of the second mounting portion 420 is to provide a cooling cavity 423, which can be used to accommodate the heat-conducting structure 500. The total pole piece 220 can pass through the cooling cavity 423 to contact the heat-conducting structure 500, and quickly conduct the heat of the total pole piece 220 to the end plate assembly, thereby realizing rapid heat dissipation of the total pole piece 220. The function of the first mounting portion 410 is to connect the second mounting portion 420 and the end plate body 300, thereby realizing the connection between the cooling structure 400 and the end plate body 300. Since the end plate body 300 has a large surface area, its heat dissipation effect is better. The heat generated by the total pole piece 220 can be conducted to the cooling structure 400 through the heat-conducting structure 500 and then to the end plate body 300, thereby improving the heat dissipation effect of the total pole piece 220.

[0065] Specifically, Figures 3 to 5As shown, in some embodiments, the second mounting portion 420 includes a mounting frame 421 and a cover plate 422 covering the mounting frame 421, the cover plate 422 and the mounting frame 421 form a cooling cavity 423, the mounting frame 421 includes two side walls 4211 arranged opposite to each other, the two side walls 4211 arranged opposite to each other are respectively provided with through holes 4212, and the total pole piece 220 is passed through the two through holes 4212.

[0066] In the above structure, the cover plate 422 and the mounting frame 421 enclose a cooling cavity 423, and the heat-conducting structure 500 is arranged in the cooling cavity 423. On the one hand, the cover plate 422 can limit the heat-conducting structure 500 so that the heat-conducting structure 500 is installed in the cooling cavity 423. At the same time, the heat-conducting structure 500 can also be abutted and matched to make the heat-conducting structure 500 in close contact with the total pole piece 220, thereby improving the heat-conducting effect of the heat-conducting structure 500. The mounting frame 421 includes four side walls connected in sequence, wherein two side walls 4211 arranged opposite to each other are respectively provided with through holes 4212. The total pole piece 220 penetrates the through hole 4212 of the first side wall 4211 and then passes out from the through hole 4212 of the second side wall 4211. The penetrated part can be used to connect an external device, and the part located in the cooling cavity 423 can fully contact with the heat-conducting structure 500 to achieve heat dissipation.

[0067] like Figure 4 As shown, in some embodiments, the cooling structure 400 further includes an insulating fixing sleeve 430 , and the insulating fixing sleeve 430 is interference-disposed between the main pole piece 220 and the through hole 4212 .

[0068] In the above structure, materials with good thermal conductivity often also have good electrical conductivity, such as metal materials, which have good thermal conductivity and electrical conductivity at the same time. When the cooling structure 400 is made of metal (such as Q235 or aluminum alloy), the insulating fixing sleeve 430 can insulate the total pole piece 220 from the cooling structure 400, and the insulating fixing sleeve 430 can also stably fix the total pole piece 220 in the through hole 4212, thereby ensuring the stability of the total pole piece 220 and reducing the probability of friction.

[0069] Figure 6 A schematic diagram of the structure of the second mounting portion of the cooling structure of the battery module provided in an embodiment of the present application, as shown in Figures 1 to 6As shown, in some embodiments, the first mounting portion 410 includes a base, the mounting frame 421 is located at an end of the base away from the end plate body 300, a first mounting hole 4121 is provided in the base, a second mounting hole 221 is provided on the total pole piece 220, and the cooling structure also includes a first fastener 440, and the first fastener 440 is passed through the first mounting hole 4121 and the second mounting hole 221. In this arrangement, the connection between the total pole piece 220 and the first mounting portion 440 can be achieved through the first fastener 440, and the total pole piece 220 is passed through the second mounting portion, so the first fastener 440 can also achieve the connection between the first mounting portion and the second mounting portion.

[0070] It should be noted that the base also includes a third mounting hole, a fourth mounting hole is provided on the end plate body 300, and the cooling structure also includes a second fastener 450, which is passed through the third mounting hole and the fourth mounting hole, thereby realizing the connection between the first mounting part and the end plate body 300 through the second fastener 450.

[0071] It should also be noted that the first fastener 440 and the second fastener 450 may be structures such as screws and bolts.

[0072] Furthermore, in some embodiments, the base includes a base body 411 and a threaded sleeve 412, a support portion 413 is provided in the base body 411, the threaded sleeve 412 is provided in the support portion 413, the threaded sleeve 412 is made of insulating material, and the cooling structure also includes an insulating gasket 460, the insulating gasket 460 is provided between the total pole piece 220 and the threaded sleeve 412, and the installation tolerance between the total pole piece 220 and the threaded sleeve 412 is adjusted by the insulating gasket.

[0073] In addition, a mounting groove is provided in the base body 411, and a threaded sleeve 412 is located in the mounting groove and connected to the bottom wall of the mounting groove. The threaded hole in the threaded sleeve 412 forms a first mounting hole 4121, and the first fastener 440 is screwed into the first mounting hole 4121 to crimp the total pole piece 220 onto the threaded sleeve 412.

[0074] Furthermore, the mounting frame 421 is arranged at the notch of the mounting slot, and a positioning device can be arranged between the mounting frame 421 and the notch of the mounting slot to achieve rapid positioning of the mounting frame 421 and the mounting slot when assembled. For example, a protrusion structure adapted to the notch of the mounting slot can be arranged on the mounting frame 421, and the positioning of the mounting frame 421 is achieved by inserting the protrusion structure into the mounting slot.

[0075] It should also be noted that the third mounting hole is provided on the bottom wall of the mounting groove, and the second fastener 450 is passed through the third mounting hole and the fourth mounting hole of the end plate body 300 to achieve the fixation of the first mounting portion 420 and the end plate body 300. In addition, the second fastener 450 can also play a role in guiding the first mounting portion 420 to the end plate body 300.

[0076] On the other hand, the present application provides a battery pack (not shown in the figure), comprising the above-mentioned battery module 10. Since the above-mentioned battery module has the advantages of good heat dissipation effect and high safety, the battery pack having the same also has the above-mentioned advantages.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0079] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0080] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0081] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A battery module, characterized in that: include: A battery pack, comprising a plurality of single cells; Electrode pieces, including connecting electrode pieces and total electrode pieces, wherein the connecting electrode pieces are used to connect the poles of the plurality of single cells, and the total electrode piece is used to connect an external device with the connecting electrode piece; An end plate assembly, located at a side of the battery pack, the end plate assembly comprising an end plate body and a cooling structure disposed on the end plate body, the cooling structure having a cooling cavity, the total pole piece passing through the cooling cavity; The heat-conducting structure is arranged in the cooling cavity and contacts the total pole piece and the inner wall of the cooling structure.

2. The battery module according to claim 1, characterized in that: The heat-conducting structure comprises a heat-conducting block, and the heat conductivity of the heat-conducting block is greater than the heat conductivity of air; and / or, The thermal conductivity of the end plate body and / or the cooling structure is greater than the thermal conductivity of the air.

3. The battery module according to claim 2, characterized in that: The cooling structure comprises a first mounting portion and a second mounting portion connected to each other, wherein the first mounting portion is connected to the end plate body, the second mounting portion has a cooling cavity, and the total pole piece is disposed in the second mounting portion.

4. The battery module according to claim 3, characterized in that: The second mounting portion includes a mounting frame and a cover plate covered on the mounting frame, the cover plate and the mounting frame enclose the cooling cavity, the mounting frame includes two side walls arranged opposite to each other, the two side walls arranged opposite to each other are respectively provided with mounting holes, and the total pole piece is passed through the two mounting holes.

5. The battery module according to claim 4, characterized in that: The cooling structure further comprises an insulating fixing sleeve, and the insulating fixing sleeve is interference-arranged between the total pole piece and the mounting hole.

6. The battery module according to claim 4, characterized in that: The first mounting portion includes a base, the mounting frame is located at an end of the base away from the end plate body, a first mounting hole is provided in the base, a second mounting hole is provided on the total pole piece, and the cooling structure further includes a first fastener, and the first fastener is inserted into the first mounting hole and the second mounting hole; The base further includes a third mounting hole, the end plate body is provided with a fourth mounting hole, and the cooling structure further includes a second fastener, which is passed through the third mounting hole and the fourth mounting hole.

7. The battery module according to claim 6, characterized in that: The base comprises a base body and a threaded sleeve, wherein the base body has a mounting groove, the threaded sleeve is located in the mounting groove and connected to the bottom wall of the mounting groove, and the threaded hole in the threaded sleeve forms the first mounting hole. The installation frame is arranged at the notch of the installation slot, The first fastener presses the total pole piece onto the threaded sleeve. The third mounting hole is arranged on the bottom wall of the mounting groove.

8. The battery module according to claim 7, characterized in that: The cooling structure further comprises an insulating gasket, which is arranged between the total pole piece and the threaded sleeve.

9. The battery module according to any one of claims 1 to 8, characterized in that: The total electrode sheet includes a total positive electrode sheet and a total negative electrode sheet, and the connecting electrode sheet includes a positive electrode connecting electrode sheet and a negative electrode connecting electrode sheet; The positive electrode connecting plate is used to connect the positive poles of the plurality of single cells in series, and the total positive electrode plate is connected to an external device and the positive electrode connecting plate; The negative electrode connecting plate is used to connect the negative poles of the plurality of single cells in series, and the total negative electrode plate is connected to an external device and the negative electrode connecting plate; The cooling structure includes a plurality of cooling structures, each of which is provided with a total positive electrode sheet or a total negative electrode sheet.

10. A battery pack, characterized in that: A battery module comprising any one of claims 1-9.

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