Battery pack and electric vehicle

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack and an electric vehicle. The battery pack provided by the embodiment of the utility model comprises a shell assembly, the battery cell module comprises a plurality of battery cell monomers arranged in sequence, a plurality of first aerogel heat insulation pieces arranged between every two adjacent battery cell monomers and second aerogel heat insulation pieces connected with the top ends of the battery cell monomers, and the top ends are the ends, close to the cover body, of the battery cell monomers; an aerosol fire extinguishing assembly; through the mode, in the battery cell module, the first aerogel heat insulation piece is arranged between every two adjacent battery cell monomers, and meanwhile, the second aerogel heat insulation piece connected with the top end of each battery cell monomer is arranged, so that the heat insulation effect between the battery cell monomers is improved, and thermal runaway of the battery pack can be prevented; and the aerosol fire extinguishing assembly is arranged in the accommodating space, so that combustion is blocked when the temperature of a fire in the battery pack is relatively high, and thermal runaway of the battery pack can be prevented.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and particularly relates to a battery pack and an electric vehicle. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, high conversion efficiency, light weight, long cycle life, etc., and are the key to energy storage devices. Currently, they have been widely used in various fields such as electronic products, electric vehicles, grid energy storage, and electric ships.

[0003] A lithium-ion battery is an energy-containing component, mainly composed of a positive electrode, a negative electrode, an electrolyte, and a separator, etc. After the lithium-ion battery is charged, its positive electrode is generally a transition metal oxide, which has strong oxidizing properties; the negative electrode is graphite with a large amount of lithium embedded inside, which has extremely strong reducing properties; the electrolyte is generally an organic ester, which has characteristics such as low melting point and flammability. Therefore, a lithium-ion battery is both a combustible and an ignition source. Once there are situations such as collision, extrusion, overcharge, short circuit, and too high external temperature, it is easy to cause thermal runaway and even lead to fire.

[0004] Currently, most of the measures for the battery pack to prevent thermal runaway are to only add an adiabatic film between adjacent battery cell monomers. In large-scale applications such as ships and grid energy storage, there are usually multiple battery packs stacked on a battery rack. When one of the battery cell monomers has a thermal runaway, a high-temperature flame will be ejected instantly when the explosion-proof valve is triggered, which can easily melt through the outer shell of the battery pack where the battery cell monomer is located, thereby igniting other battery packs to have a thermal runaway and causing a chain reaction of thermal runaway of the battery pack. The above method of adding an adiabatic film is not conducive to preventing the battery pack from having a thermal runaway. Summary of the Utility Model

[0005] In view of the above problems, the embodiments of the present application provide a battery pack and an electric vehicle to solve the above technical problems that are not conducive to preventing the battery pack from having a thermal runaway.

[0006] In a first aspect, the embodiments of the present application provide a battery pack, including:

[0007] A housing assembly, including a box body having an accommodation space and a cover body covering the box body;

[0008] At least one battery cell module disposed in the accommodation space, including a plurality of battery cell monomers arranged in sequence, a plurality of first aerogel heat insulation members respectively disposed between every two adjacent battery cell monomers, and a second aerogel heat insulation member respectively connected to the tops of the plurality of battery cell monomers, where the top end is the end of the battery cell monomer close to the cover body;

[0009] An aerosol fire extinguishing assembly disposed on the side of the cover body facing the battery cell module.

[0010] Optionally, the battery pack further includes an insulating upper cover disposed corresponding to the battery cell module. The insulating upper cover includes a top plate spaced from a side of the battery cell module close to the cover body, and two side plates respectively connected to two ends of the top plate. The two side plates respectively extend from the two ends of the top plate towards the battery cell module; an air flow channel is formed between the battery cell module and the insulating upper cover.

[0011] Optionally, the battery pack further includes a first explosion-proof valve disposed on the box body, and the first explosion-proof valve is communicated with the air flow channel.

[0012] Optionally, the number of the battery cell modules is two, and the two battery cell modules are spaced in a first direction perpendicular to the arrangement direction of the battery cells. A first gap is formed between the two battery cell modules, and the first explosion-proof valve is opposite to the first gap;

[0013] The projection of the aerosol fire extinguishing assembly on the bottom of the box body in a second direction and the projection of the first gap on the bottom of the box body in the second direction have an overlapping part, and the second direction is perpendicular to the first direction and the arrangement direction of the battery cells respectively.

[0014] Optionally, the housing assembly further includes a partition plate disposed in the box body. The partition plate divides the accommodation space into a first accommodation cavity and a second accommodation cavity arranged in sequence along the arrangement direction of the battery cells. The battery cell module, the aerosol fire extinguishing assembly and the insulating upper cover are respectively disposed in the second accommodation cavity.

[0015] Optionally, the battery pack further includes a temperature management unit and a battery management unit disposed in the first accommodation cavity.

[0016] Optionally, the battery cell module further includes two first insulating plates oppositely disposed in the first direction and two second insulating plates oppositely disposed in the arrangement direction of the battery cells. A first aerogel heat insulation member is disposed between the second insulating plate and the adjacent battery cell.

[0017] Optionally, the battery cell module further includes a wire harness isolation plate disposed on a side of the second aerogel heat insulation member away from the battery cell;

[0018] A gap portion is formed on a side of the partition plate close to the cover body. The partition plate further includes a bent portion extending from the bottom of the gap portion towards the first accommodation cavity. One end of the wire harness isolation plate close to the first accommodation cavity extends into the first accommodation cavity from the gap portion and is placed on the bent portion;

[0019] The battery pack further includes a sealing plate extending in the first direction. The sealing plate is located between the inner wall of the cover body and the wire harness separation plate in the second direction, and the sealing plate abuts against one end of the insulating upper cover close to the first accommodation cavity in the arrangement direction of the battery cells.

[0020] Optionally, the battery cell includes a positive electrode tab, a negative electrode tab and a second explosion-proof valve, and the positive electrode tab, the negative electrode tab and the second explosion-proof valve are respectively arranged at the top end of the battery cell.

[0021] In a second aspect, an embodiment of the present application provides an electric vehicle, and the electric vehicle includes the above-mentioned battery pack.

[0022] The battery pack and the electric vehicle provided by the embodiments of the present application include a housing assembly, which includes a box body having an accommodation space and a cover body covering the box body; at least one battery cell module arranged in the accommodation space, which includes a plurality of battery cells arranged in sequence, a plurality of first aerogel heat insulation members respectively arranged between every two adjacent battery cells, and a second aerogel heat insulation member respectively connected to the top ends of the plurality of battery cells, and the top end is the end of the battery cell close to the cover body; an aerosol fire extinguishing assembly arranged on the side of the cover body close to the battery cell module; in this way, in the battery cell module, a first aerogel heat insulation member is arranged between every two adjacent battery cells, and at the same time, a second aerogel heat insulation member respectively connected to the top end of each battery cell is arranged, improving the heat insulation effect between the battery cells and being beneficial to preventing the battery pack from thermal runaway; an aerosol fire extinguishing assembly is arranged in the accommodation space, and when the temperature in the battery pack is high due to a fire, it blocks the combustion, which is beneficial to preventing the battery pack from thermal runaway.

[0023] These aspects or other aspects of the present application will be more clearly understood in the following description of the embodiments. Description of the Drawings

[0024] Figure 1 It is a top view of the battery pack according to an embodiment of the present application.

[0025] Figure 2 is Figure 1 A cross-sectional view of the battery pack shown along the A-A direction.

[0026] Figure 3 is Figure 1 A structural diagram of the battery pack shown.

[0027] Figure 4 is Figure 1 An exploded view of the structure of the battery pack shown.

[0028] Figure 5 is Figure 1 A cross-sectional view of the battery pack shown along the B-B direction.

[0029] Figure 6 As Figure 1 The schematic diagram of the cooperation between the battery cell module and the insulating cover in the battery pack shown in the figure.

[0030] Figure 7 As Figure 1 The partial structural exploded view of the battery cell module and the insulating cover in the battery pack shown in the figure.

[0031] Figure 8 As Figure 1 The schematic diagram of the internal structure of the box body in the battery pack shown in the figure.

[0032] Figure 9 As Figure 1 The partial structural schematic diagram of the battery pack shown in the figure.

[0033] The meanings of the reference numerals in the accompanying drawings are as follows:

[0034] 100 - battery pack; 10 - outer shell assembly; 11 - box body; 111 - first accommodation cavity; 112 - second accommodation cavity; 12 - cover body; 13 - first gap; 14 - partition board; 141 - void part; 142 - bent part; 15 - sealing plate; 16 - waterproof ring; 20 - battery cell module; 21 - battery cell unit; 211 - top end; 21a - positive electrode tab; 21b - negative electrode tab; 21c - second explosion-proof valve; 20a - battery cell unit array; 22 - first aerogel heat insulation member; 23 - second aerogel heat insulation member; 24 - first insulating plate; 25 - second insulating plate; 26 - wire harness partition board; 27 - steel ring; 28 - silica gel pad; 30 - aerosol fire extinguishing assembly; 40 - insulating upper cover; 41 - top plate; 42 - side plate; 50 - first explosion-proof valve; 61 - temperature management unit; 62 - battery management unit; Detailed implementation manners

[0035] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The implementation manners described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as a limitation to the present application.

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0037] In the embodiments of the present application, it should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0038] Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0039] In the description of the embodiments of the present application, words such as "example" or "for example" are used to represent examples, explanations or descriptions. Any embodiment or design described as "for example" or "for instance" in the embodiments of the present application is not construed as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0040] In addition, "a plurality of" in the embodiments of the present application means two or more. In view of this, "a plurality of" in the embodiments of the present application can also be understood as "at least two". "At least one" can be understood as one or more, for example, understood as one, two or more. For example, including at least one means including one, two or more, and does not limit which ones are included. For example, including at least one of A, B, and C, then the ones included can be A, B, C, A and B, A and C, B and C, or A and B and C.

[0041] It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / ", unless otherwise specified, generally represents an "or" relationship between the associated objects before and after.

[0042] An embodiment of the present application provides a battery pack 100. Please refer to Figures 1 to 4 As shown, the battery pack 100 includes: a housing assembly 10, at least one battery cell module 20, and an aerosol fire extinguishing assembly 30.

[0043] Among them, please refer to Figure 3 and Figure 4As shown in the figure, the housing assembly 10 includes a box body 11 and a cover body 12 that cooperate with each other. The box body 11 has an accommodation space, and the cover body 12 is covered on the box body 11.

[0044] Among them, please refer to Figure 2 , Figure 7 and Figure 9 As shown, the battery cell module 20 is disposed in the accommodation space of the box body 11. The battery cell module 20 includes a plurality of battery cell monomers 21, a plurality of first aerogel heat insulation members 22, and a second aerogel heat insulation member 23. The plurality of battery cell monomers 21 are arranged in sequence to form a battery cell monomer array 20a. The plurality of first aerogel heat insulation members 22 are respectively disposed between every two adjacent battery cell monomers 21. The second aerogel heat insulation member 23 is disposed on the top of the battery cell monomer array 20a. The second aerogel heat insulation member 23 is respectively connected to the top ends 211 of the plurality of battery cell monomers 21. The top end 211 of the battery cell monomer 21 is the end of the battery cell monomer 21 close to the cover body 12. By disposing the first aerogel heat insulation member 22 between two adjacent battery cell monomers 21 and disposing the second aerogel heat insulation member 23 on the top of the battery cell monomer array 20a, when a certain battery cell monomer 21 has a thermal runaway phenomenon, through the heat insulation effect of the first aerogel heat insulation member 22, heat is prevented from being transferred to the adjacent battery cell monomer 21 through the surface in contact with the adjacent battery cell monomer 21; through the setting of the second aerogel heat insulation member 23, heat is prevented from being transferred to the top ends 211 of the adjacent battery cell monomers 21 through the top end 211 of the battery cell monomer 21 with thermal runaway.

[0045] Among them, the aerosol fire extinguishing assembly 30 is disposed on the side of the cover body 12 facing the battery cell module 20. By setting the aerosol fire extinguishing assembly 30, combustion is blocked when the internal temperature of the accommodation space is relatively high. The aerosol fire extinguishing assembly 30 can adopt an aerosol fire extinguisher in the prior art. For example, the aerosol fire extinguisher includes an aerosol agent and a fire extinguishing particle generator. When the aerosol fire extinguisher works, the aerosol agent is used to generate a fire extinguishing gas, and the fire extinguishing gas can be used for fire extinguishing; at the same time, the heat and power of the fire extinguishing gas cause the fire extinguishing particle generator to decompose and release high-efficiency fire extinguishing particles, and the fire extinguishing particles are also used for fire extinguishing.

[0046] In this embodiment, in the battery cell module, a first aerogel heat insulation member is disposed between every two adjacent battery cell monomers, and a second aerogel heat insulation member respectively connected to the top end of each battery cell monomer is also set, which improves the heat insulation effect between the battery cell monomers and is beneficial to preventing the battery pack from having a thermal runaway; an aerosol fire extinguishing assembly is disposed in the accommodation space, and combustion is blocked when the internal temperature of the battery pack is relatively high, which is beneficial to preventing the battery pack from having a thermal runaway.

[0047] As an implementation manner, please refer to Figure 7As shown, the single battery cell 21 includes a positive electrode tab 21a, a negative electrode tab 21b, and a second explosion-proof valve 21c. The top end 211 of the single battery cell 21 is the end where the positive electrode tab 21a, the negative electrode tab 21b, and the second explosion-proof valve 21c are provided. In this embodiment, when a certain single battery cell 21 has a thermal runaway phenomenon, its second explosion-proof valve 21c is opened, and high-temperature gas is discharged from the second explosion-proof valve 21c. Through the setting of the second aerogel heat-insulating member 23, the heat of the high-temperature gas discharged from the single battery cell 21 with thermal runaway is prevented from being transferred to the top end 211 of the adjacent single battery cell 21, which is beneficial to enhancing the effect of preventing the battery pack from having a thermal runaway.

[0048] As an implementation, please refer to Figures 4 to 7 As shown, the battery pack 100 further includes an insulating upper cover 40 corresponding to the battery cell module 20 and a first explosion-proof valve 50 provided on the box body 11. The insulating upper cover 40 includes a top plate 41 and two side plates 42 respectively connected to both ends of the top plate 41. The top plate 41 is spaced from the side of the battery cell module 20 close to the cover body 12. The two side plates 42 extend from both ends of the top plate 41 towards the battery cell module 20; an air flow channel is formed between the battery cell module 20 and the insulating upper cover 40. The first explosion-proof valve 50 is communicated with the air flow channel.

[0049] In this embodiment, when a certain single battery cell 21 has a thermal runaway phenomenon, the generated high-temperature gas can flow from the air flow channel formed between the battery cell module 20 and the insulating upper cover 40 to the first explosion-proof valve 50, which is beneficial to the rapid discharge of the high-temperature gas, and thus beneficial to enhancing the effect of preventing the battery pack from having a thermal runaway.

[0050] In some embodiments, please refer to Figure 4 and Figure 9 As shown, the number of the battery cell modules 20 is two. The two battery cell modules 20 are spaced apart in the first direction S1. The first direction S1 is perpendicular to the arrangement direction S of the single battery cells 21. A first gap 13 is formed between the two battery cell modules 20. The first explosion-proof valve 50 is opposite to the first gap 13. In this embodiment, there is a first gap 13 between the two battery cell modules 20 and they do not contact each other, which is beneficial to isolating the heat transfer between the battery cell modules 20 and beneficial to enhancing the effect of preventing the battery pack from having a thermal runaway; the setting position of the first explosion-proof valve 50 is opposite to the first gap 13, and the first explosion-proof valve 50 is relatively close to both ends of the air flow channels of the two battery cell modules 20 where the air flows out, which is beneficial to the rapid discharge of the high-temperature gas.

[0051] In some embodiments, the projection of the aerosol fire extinguishing assembly 30 along the second direction S2 on the bottom of the box body 11 overlaps with the projection of the first gap 13 along the second direction S2 on the bottom of the box body 11. The second direction S2 is perpendicular to the first direction S1 and the arrangement direction S of the battery cells 21 respectively. In this embodiment, the installation position of the aerosol fire extinguishing assembly 30 corresponds to the first gap 13. The aerosol fire extinguishing assembly 30 is relatively close to both of the two battery cell modules 20, which is conducive to the timely release of fire extinguishing gas and fire extinguishing particles.

[0052] As an embodiment, please refer to Figure 8 As shown, the housing assembly 10 further includes a partition board 14 provided in the box body 11. The partition board 14 divides the accommodation space into a first accommodation cavity 111 and a second accommodation cavity 112 arranged in sequence along the arrangement direction S of the battery cells 21. The battery cell module 20, the aerosol fire extinguishing assembly 30, and the insulating upper cover 40 are respectively arranged in the second accommodation cavity 112.

[0053] In some embodiments, please refer to Figure 9 As shown, the battery pack 100 further includes a temperature management unit 61 (Temperature Management Unit, TMU) and a battery management unit 62 (Battery Management Unit, BMU) provided in the first accommodation cavity 111. In this embodiment, the temperature management unit 61 and the battery management unit 62 are arranged in the first accommodation cavity 111, and the battery cell module 20 is arranged in the second accommodation cavity 112, reducing the influence degree of a certain battery cell 21 in thermal runaway on the components arranged in the first accommodation cavity 111.

[0054] In some embodiments, please refer to Figure 6 and Figure 7 As shown, the battery cell module 20 further includes two first insulating plates 24 and two second insulating plates 25. The two first insulating plates 24 are arranged opposite to each other in the first direction S1, and the two second insulating plates 25 are arranged opposite to each other in the arrangement direction S of the battery cells 21. A first aerogel heat insulation member 22 is provided between the second insulating plate 25 and the adjacent battery cell 21. The two first insulating plates 24 and the two second insulating plates 25 are respectively perpendicular to the cover body 12. In this embodiment, the two first insulating plates 24 and the two second insulating plates 25 surround the battery cell array 20a, improving the safety of the battery cell module 20.

[0055] In some embodiments, please refer to Figure 7 As shown, the battery cell module 20 further includes a wire harness partition board 26. The wire harness partition board 26 is arranged on the side of the second aerogel heat insulation member 23 away from the battery cell 21. One end of the wire harness partition board 26 extends into the first accommodation cavity 111 to be connected with the components in the first accommodation cavity 111 through a connecting member (not shown in the figure).

[0056] Accordingly, please refer to Figure 8 and Figure 9 As shown, a gap portion 141 is formed on the side of the partition plate 14 close to the cover body 12. The partition plate 14 further includes a bent portion 142 extending from the bottom of the gap portion 141 to the first accommodation cavity 111. One end of the wire harness partition plate 26 close to the first accommodation cavity 111 extends into the first accommodation cavity 111 from the gap portion 141 and is placed on the bent portion 142. The battery pack 100 further includes a sealing plate 15 extending in the first direction S1. The sealing plate 15 is located between the inner wall of the cover body 12 and the wire harness partition plate 26 in the second direction S2. The sealing plate 15 abuts against one end of the insulating upper cover 40 close to the first accommodation cavity 111 in the arrangement direction S of the battery cells 21.

[0057] In this embodiment, due to the setting of the gap portion 141, the first accommodation cavity 111 and the second accommodation cavity 112 cannot be isolated by the partition plate 14. Therefore, by setting the sealing plate 15, the combination of the sealing plate 15, the wire harness partition plate 26 and the partition plate 14 enhances the isolation effect between the first accommodation cavity 111 and the second accommodation cavity 112.

[0058] In some embodiments, please refer to Figure 6 As shown, two first insulating plates 24 and two second insulating plates 25 enclose a side wall structure. The battery cell module 20 further includes a steel ring 27 sleeved on the side wall structure.

[0059] In some embodiments, please refer to Figure 6 and Figure 7 As shown, the battery cell module 20 further includes a silica gel pad 28 disposed at the bottom of the battery cell array 20a.

[0060] In some embodiments, please refer to Figure 3 and Figure 4 As shown, the housing assembly 10 further includes a waterproof ring 16 disposed between the box body 11 and the cover body 12.

[0061] An embodiment of the present application further provides an electric vehicle, which includes the above-mentioned battery pack 100.

[0062] The above are only the embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present application, improvements can still be made, but these all belong to the protection scope of the present application.

Claims

1. A battery pack, characterized in that, Comprising: A housing assembly, including a box body having an accommodation space and a cover body covering the box body; At least one battery cell module disposed in the accommodation space, including a plurality of battery cell monomers arranged in sequence, a plurality of first aerogel heat insulation members respectively disposed between every two adjacent battery cell monomers, and a second aerogel heat insulation member respectively connected to the tops of the plurality of battery cell monomers, where the top is the end of the battery cell monomer close to the cover body; An aerosol fire extinguishing assembly disposed on the side of the cover body facing the battery cell module.

2. The battery pack according to claim 1, characterized in that, The battery pack further includes an insulating upper cover corresponding to the battery cell module. The insulating upper cover includes a top plate spaced from the side of the battery cell module close to the cover body and two side plates respectively connected to both ends of the top plate. The two side plates respectively extend from both ends of the top plate towards the battery cell module; an air flow channel is formed between the battery cell module and the insulating upper cover.

3. The battery pack according to claim 2, wherein The battery pack further includes a first explosion-proof valve disposed on the box body, and the first explosion-proof valve is communicated with the air flow channel.

4. The battery pack according to claim 3, wherein The number of the battery cell modules is two, and the two battery cell modules are spaced apart in a first direction perpendicular to the arrangement direction of the battery cell monomers. A first gap is formed between the two battery cell modules, and the first explosion-proof valve is opposite to the first gap; The projection of the aerosol fire extinguishing assembly along a second direction on the bottom of the box body and the projection of the first gap along the second direction on the bottom of the box body have an overlapping part, and the second direction is respectively perpendicular to the first direction and the arrangement direction of the battery cell monomers.

5. The battery pack according to claim 3, characterized in that, The housing assembly further includes a partition plate disposed in the box body. The partition plate divides the accommodation space into a first accommodation cavity and a second accommodation cavity arranged in sequence along the arrangement direction of the battery cell monomers. The battery cell module, the aerosol fire extinguishing assembly, and the insulating upper cover are respectively disposed in the second accommodation cavity.

6. The battery pack according to claim 5, characterized in that, The battery pack further includes a temperature management unit and a battery management unit disposed in the first accommodation cavity.

7. The battery pack according to claim 5, characterized in that, The battery cell module further includes two first insulating plates oppositely disposed in the first direction and two second insulating plates oppositely disposed in the arrangement direction of the battery cell monomers. The first aerogel heat insulation member is disposed between the second insulating plate and the adjacent battery cell monomer, and the first direction is perpendicular to the arrangement direction of the battery cell monomers.

8. The battery pack according to claim 7, characterized in that, The battery cell module further includes a wire harness isolation plate disposed on the side of the second aerogel heat insulation member away from the battery cell monomer; A gap portion is formed on the side of the partition plate close to the cover body. The partition plate further includes a bent portion extending from the bottom of the gap portion towards the first accommodation cavity. One end of the wire harness isolation plate close to the first accommodation cavity extends into the first accommodation cavity from the gap portion and is placed on the bent portion; The battery pack further includes a sealing plate extending along the first direction. The sealing plate is located between the inner wall of the cover body and the wiring harness separator plate in the second direction. The sealing plate abuts against one end of the insulating upper cover close to the first accommodation cavity in the arrangement direction of the battery cell modules. The second direction is perpendicular to the first direction and the arrangement direction of the battery cell modules respectively.

9. The battery pack according to claim 7, wherein The battery cell module includes a positive electrode tab, a negative electrode tab, and a second explosion-proof valve. The positive electrode tab, the negative electrode tab, and the second explosion-proof valve are respectively arranged at the top end of the battery cell module.

10. An electric vehicle, characterized in that, The electric vehicle includes the battery pack according to any one of claims 1 to 7.

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