Battery Pack and Vehicle

Abstract

Battery pack and vehicle. The battery pack includes a sealing cover, a tray, a plurality of battery cells, an insulating layer, and at least one connection sheet. The tray is connected to the sealing cover to define a receiving cavity, the plurality of battery cells are disposed in the receiving cavity, the side surface of each battery cell facing away from the sealing cover is provided with a first explosion prevention valve, each insulating layer is disposed on the side surface of the battery cell facing away from the sealing cover, the connection sheet is disposed on the insulating layer, the battery cells are electrically connected by the connection sheet, and each insulating layer is provided with a gas discharge portion configured to communicate the outside with the first explosion prevention valve.

Description

Technical Field

[0001] Cross - reference to Related Applications This disclosure claims the priority and benefits of Chinese Patent Application No. 202221617994.8, entitled "BATTERY PACK AND VEHICLE", filed on June 23, 2022, and Chinese Patent Application No. 202320076673.X, entitled "BATTERY PACK AND VEHICLE", filed on January 9, 2023. The entire content of the applications referenced above is incorporated herein by reference.

[0002] This disclosure relates to the field of battery technology, and more particularly to battery packs and vehicles.

Background Art

[0003] When a failure occurs in a battery cell of a power battery, high - temperature and high - pressure gas is generated inside the battery cell. To prevent a possible explosion, an explosion - proof valve can be disposed on the housing of the battery cell, and when a failure in the battery cell causes excessive pressure, the explosion - proof valve opens to relieve the pressure.

[0004] In related technologies, the battery pack is disposed at the bottom of the vehicle. When the battery pack is assembled, a plurality of battery cells are connected in series or in parallel. When a failure occurs in a battery cell, the high - temperature and high - pressure gas in the battery cell is released through the explosion - proof valve, affecting other battery cells. When a thermal failure occurs in the entire battery pack, the high - temperature and high - pressure gas in the battery pack is released upward, and the gas released upward through the explosion - proof valve of the battery pack affects the passenger compartment and causes injury to passengers or the driver.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present disclosure aims to provide a battery pack and a vehicle to solve at least one of the technical problems existing in the related art.

Means for Solving the Problem

[0006] To achieve the above object, there is provided a battery pack including a sealing cover, a tray connected to the sealing cover to define an accommodating cavity, a plurality of battery cells disposed in the accommodating cavity, wherein a first explosion prevention valve is disposed on a side surface of the battery cell facing away from the sealing cover, and an insulating layer disposed on a side surface of the battery cell facing away from the sealing cover, wherein a gas emission piece is disposed on the insulating layer, and the gas emission piece communicates the outside with the first explosion prevention valve.

[0007] Optionally, the battery pack further includes at least one connection sheet. The connection sheet is disposed on the insulating layer, and the battery cells are electrically connected to each other through the connection sheet.

[0008] Optionally, the insulating layer is an insulating bracket, the tray includes a bottom plate, and the bottom plate is configured as the insulating bracket.

[0009] Optionally, the gas emission piece includes a first sub-channel and a plurality of through holes. The plurality of through holes are provided on the insulating bracket, the first sub-channel is provided in the insulating bracket, and is configured to communicate with the outside. The plurality of through holes are provided in a one-to-one correspondence with the first explosion prevention valves of the plurality of battery cells, and all the plurality of through holes communicate with the first sub-channel.

[0010] Optionally, the insulating layer is an insulating bracket, the tray includes a bottom plate, the bottom plate has a hollow region, and the insulating bracket is disposed in the hollow region.

[0011] Optionally, the bottom plate includes a first exhaust channel, and the gas release component communicates with the outside through the first exhaust channel.

[0012] Optionally, the gas release component includes a first sub-channel and a plurality of through-holes. The plurality of through-holes are provided on the insulating bracket, the first sub-channel is provided within the insulating bracket, and the plurality of through-holes are provided in a one-to-one correspondence with the first explosion-proof valves of the plurality of battery cells. All of the plurality of through-holes communicate with the first sub-channel, and the first sub-channel communicates with the first exhaust channel.

[0013] Optionally, the gas release component further includes a groove, the groove is provided on the insulating bracket, and the groove is open with respect to the side surface of the sealing cover. The through-hole is provided on the bottom wall of the groove, the battery cell abuts against the side wall of the groove, and a second sub-channel passing through the enclosure is formed. The first sub-channel is provided on the side surface of the insulating bracket facing away from the sealing cover, the first sub-channel and the second sub-channel are provided on opposite sides, and communicate with each other through the through-hole.

[0014] Optionally, a plurality of battery cells are sequentially laid out along a first direction to form a battery cell sequence, a plurality of battery cell sequences are arranged, sequentially laid out along a second direction, a plurality of gas release components are arranged, and the plurality of gas release components correspond to the plurality of battery cell sequences one-to-one, and the first direction is perpendicular to the second direction.

[0015] Optionally, a second explosion-proof valve is arranged at the end of the first exhaust channel away from the gas release component.

[0016] Optionally, the insulating bracket is joined to the tray.

[0017] Optionally, the diameter of the through-hole is larger than the diameter of the first explosion prevention valve.

[0018] Optionally, the insulating layer is an insulating bracket, the tray includes a bottom plate, and the insulating bracket is disposed on the side surface of the bottom plate facing the sealing cover. The gas release component includes a plurality of exhaust holes, and the plurality of exhaust holes are provided on the insulating bracket. A second exhaust channel is provided in the bottom plate. The plurality of exhaust holes are provided in a one-to-one correspondence with the first explosion prevention valves of the plurality of battery cells, and the plurality of exhaust holes communicate with the outside through the second exhaust channel.

[0019] Optionally, the battery pack includes at least one connection sheet, the connection sheet is disposed on the insulating layer, and the battery cells are electrically connected to each other through the connection sheet. The battery cell has a positive terminal and a negative terminal, and the positive terminal and the negative terminal are disposed on the side surface of the corresponding battery cell facing away from the sealing cover. At least one connection sheet is electrically connected to the positive terminal of one of the corresponding two battery cells and the negative terminal of the other.

[0020] Optionally, an accommodation space is provided on the side surface of the insulating bracket facing the sealing cover, and the positive terminal of the battery cell and / or the negative terminal of the battery cell are disposed in the accommodation space.

[0021] Optionally, the depth of the accommodation space is greater than or equal to the length of the positive terminal or the negative terminal of the corresponding battery cell.

[0022] Optionally, the surface of the battery cell where the positive terminal and the negative terminal are provided abuts against the side surface of the insulating bracket facing the sealing cover, and the insulating bracket supports the battery cell.

[0023] Optionally, a plurality of battery cells are sequentially laid out along a first direction to form a battery cell sequence, and the accommodation space is dispersed on at least one side surface of the gas discharge component along a second direction. The positive terminal of the battery cell and / or the negative terminal of the battery cell are arranged in the corresponding accommodation space, and the first direction is perpendicular to the second direction.

[0024] Optionally, the battery pack includes at least one connection sheet, the connection sheet is disposed on an insulating layer, the battery cells are electrically connected to each other through the connection sheet, the connection sheet and the insulating bracket are integrally formed, and / or the battery pack further includes at least one sampling member, the sampling member is connected to the corresponding battery cell, and the sampling member and the insulating bracket are integrally formed.

[0025] Optionally, the sampling member is a sampling harness, an FPC, or a PCB board.

[0026] Optionally, the battery pack includes at least one connection sheet, the connection sheet is disposed on an insulating layer, and the battery cells are electrically connected to each other through the connection sheet. The battery pack further includes a battery information collector and a circuit board separately connected to the battery information collector and the connection sheet, and the battery information collector, the connection sheet, and the circuit board are respectively fixed to the insulating bracket.

[0027] Optionally, the connection sheet and the circuit board are integrated on the insulating bracket, and the connection sheet and the circuit board are respectively integrally formed with the insulating bracket. The connection sheet is fixed to the side surface of the insulating bracket facing the battery cell, the circuit board is incorporated into the insulating bracket, and the battery information collector is fixed to the side surface of the insulating bracket facing away from the battery cell.

[0028] Optionally, the battery pack further includes a heat dissipation plate having a flow path for flowing a cooling medium. A plurality of battery cells are laid out along a second direction to form battery cell groups. A plurality of battery cell groups are arranged, and the plurality of battery cell groups are laid out along a first direction. The first direction is perpendicular to the second direction, the heat dissipation plate is disposed between any two adjacent battery cell groups, and the heat dissipation plate is thermally connected to two corresponding battery cell groups.

[0029] Optionally, the second direction is the width direction of the battery cell, the first direction is the thickness direction of the battery cell, and the width of the battery cell is greater than the thickness of the battery cell.

[0030] Optionally, the outer surface of the battery cell includes two first surfaces facing each other along the first direction, two second surfaces facing each other along the second direction, and two third surfaces facing each other along the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. Among the first surface, the second surface, and the third surface, the first surface has the largest area, and the heat dissipation plate is thermally connected to the first surface of each battery cell in two corresponding battery cell groups.

[0031] Optionally, the battery pack further includes an expansion beam and a cooling plate disposed in the accommodation cavity. The expansion beam is disposed adjacent to a plurality of battery cells, and the expansion beam is fixed to the tray. The cooling plate is pressed against the side surface of the battery cell facing the sealing cover, and the cooling plate is fixedly connected to the expansion beam.

[0032] According to a second aspect of the present disclosure, a vehicle including a vehicle body and the aforementioned battery pack is provided. The tray is fixedly connected to the vehicle body. Alternatively, the vehicle body is integrally formed with the tray or the sealing cover.

[0033] According to the foregoing technical solution, the first explosion prevention valve is disposed near the tray of the battery cell. As a result, the first explosion prevention valve can discharge gas toward the lower insulating layer, and the gas can be discharged through the gas discharge component on the insulating layer. The downward discharge direction of the gas can avoid the upward flow of the gas, avoid the influence on the cab, and reduce the injury to the passengers inside the vehicle.

[0034] Other features and advantages of the present disclosure will be described in detail in the part of the embodiments for carrying out the following invention.

[0035] The accompanying drawings are for the purpose of providing a further understanding of the present disclosure and constitute a part of this specification. The following accompanying drawings and specific implementations are not for the purpose of constituting a limitation to the present disclosure, but are used together to clarify the present disclosure.

Brief Description of the Drawings

[0036]

Figure 1

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Figure 8

Figure 9

Figure 10

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Figure 12

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Figure 16

Mode for Carrying Out the Invention

[0037] With reference to the accompanying drawings, specific implementations of the present disclosure are described in detail below. It should be understood that the specific implementations described herein are only used to illustrate and clarify the present disclosure and are not intended to limit the present disclosure.

[0038] In the present disclosure, unless otherwise specified, directional terms such as "inside and outside" refer to the inside and outside of the contour of the corresponding component. The "connection" described below can include mechanical connection, electrical connection, etc., and can be determined according to the actual functions of the components. For example, the connection between a connection sheet and a circuit board is an electrical connection, and the form of the electrical connection may be a wired connection or a wireless connection.

[0039] Furthermore, terms such as "first" and "second" are used in the present disclosure to distinguish one element from another and are not in terms of order or importance. When the following description uses the accompanying drawings, unless otherwise indicated, the same numbers in different accompanying drawings represent the same or similar elements.

[0040] As shown in FIGS. 1 to 7, the present disclosure provides a battery pack including a sealing cover 400, a tray 300, a plurality of battery cells 100, and an insulating layer 21. The sealing cover 400 is connected to the tray 300 to define an accommodation cavity, and the plurality of battery cells 100 are disposed in the accommodation cavity. When the battery pack is used in a vehicle, the tray 300 is fixedly connected to the vehicle body. For example, the tray 300 can be fixedly attached to the vehicle body as a whole by bolts. Alternatively, the vehicle body is integrally formed with the tray or the sealing cover 400. The vehicle body may be a vehicle frame or a chassis. Each battery cell 100 has a first explosion prevention valve 101 facing away from the sealing cover 400, or a part of each battery cell 100 has a first explosion prevention valve 101 facing away from the sealing cover 400. That is, the first explosion prevention valve 101 is disposed on the side surface of each battery cell 100 or a part of the battery cell 100 facing away from the sealing cover 400. The insulating layer 21 is disposed on the side surface of the battery cell 100 facing away from the sealing cover 400, and the gas release component 200 is disposed on the insulating layer 21. The gas release component 200 communicates the outside with the first explosion prevention valve 101. The insulating layer 21 may be an insulating bracket 210 (the insulating bracket 210 and the connection sheet 230 described below can be integrally formed or assembled as an integral component) or an insulating coating (the insulating coating can be coated on the tray 300, for example). In this specification, in this embodiment of the present disclosure, the sealing cover 400 and the tray 300 can be bolted. Further, in another embodiment, the sealing cover 400 and the tray 300 can be connected by a buckle, and a sealing adhesive is coated on the connection. This is not limited in the present disclosure.

[0041] The type of the first explosion prevention valve 101 is not limited in the present disclosure. For example, in this embodiment of the present disclosure, the first explosion prevention valve 101 may be a rupture disk. In this embodiment of the present disclosure, the gas release component 200 can be integrally formed with the insulating bracket 210 by the structural design of the insulating bracket 210. Further, in another embodiment, alternatively, the gas release component 200 may be a separate component, and the gas release component 200 is fixed to the insulating bracket 210 by means such as bonding. This is not limited in the present disclosure.

[0042] According to the foregoing technical solution, the first explosion prevention valve 101 is disposed on the side surface of the battery cell 100 near the tray 300. As a result, the first explosion prevention valve 101 can release gas toward the lower insulating layer 21, and the gas can be released through the gas release component 200 on the insulating layer 21. The downward release direction of the gas can avoid the upward flow of the gas, avoid the influence on the driver's cab, and reduce the injury to the passengers inside the vehicle.

[0043] In order to connect a plurality of battery cells 100 in series or in parallel as a whole, in this embodiment of the present disclosure, the battery pack 10 can further include at least one connection sheet 230. The connection sheet 230 can be disposed on the insulating layer 21, and the battery cells 100 can be electrically connected to each other through the connection sheet 230.

[0044] Furthermore, in this embodiment of the present disclosure, each battery cell 100 can have a positive terminal 1021 and a negative terminal 1022. The positive terminal 1021 and the negative terminal 1022 are disposed on the side surface of the corresponding battery cell 100 facing away from the sealing cover 400, that is, on the same side surface as the first explosion prevention valve 101. As a result, the battery cell as a whole is "reversed" within the battery pack. In this configuration, in order to facilitate connection to the connection sheet 230, the positive and negative terminals of the battery cell are disposed downward. At least one connection sheet 230 is electrically connected to the positive terminal 1021 of one of the two corresponding battery cells 100 and the negative terminal 1022 of the other, and as a result, a plurality of battery cells 100 are connected to form a battery module. In this specification, in this embodiment of the present disclosure, the connection sheet 230 and the terminal 102 can be welded. Certainly, in another embodiment, the battery cell 100 can include only the positive terminal 1021, and the housing of the battery cell 100 is negatively charged. In this case, the connection sheet 230 is connected to the positive terminal 1021 of one of the two battery cells 100 and the housing of the other. Alternatively, the battery cell 100 includes only the negative terminal 1022, and the housing of the battery cell 100 is positively charged. In this case, the connection sheet 230 is connected to the negative terminal 1022 of one of the two battery cells 100 and the housing of the other.

[0045] Please refer to FIG. 12. In this embodiment of the present disclosure, the side surface of the insulating bracket 210 facing the sealing cover 400 can be provided with an accommodation space 215, and the positive terminal 1021 and / or the negative terminal 1022 of the battery cell 100 are arranged in the accommodation space 215. In this specification, in this embodiment of the present disclosure, the accommodation space 215 can be integrally formed by the structure of the insulating bracket 210 (for example, as shown in FIG. 12, the insulating bracket 210 includes a portion configured as a flat U-shaped structure, and that portion is the accommodation space 215). Further, in another embodiment, the accommodation space 215 can be formed by the concave surface of the insulating bracket 210. This is not limited in the present disclosure. In this configuration, the space of the accommodation cavity occupied by the battery cell 100 in the height direction can be reduced, and the space utilization rate in the height direction of the battery pack is improved. The accommodation space 215 may be in a groove shape or a hole shape. It can be understood that the accommodation space 215 can accommodate both the positive terminal 1021 and the negative terminal 1022 of the battery, or the positive and negative terminals 1022 of the battery are accommodated in different accommodation spaces 215 respectively.

[0046] Furthermore, in order to further improve the space utilization rate in the height direction of the battery pack, the depth of the accommodation space 215 may be greater than or equal to the length of the positive terminal 1021 or the negative terminal 1022 of the corresponding battery cell 100. Note that the length of the positive terminal 1021 or the negative terminal 1022 is the distance between two outer surfaces of a part of the terminal exposed from the battery housing along the axial direction of the terminal, that is, the distance between the outer surface of the terminal facing away from the sealing cover 400 in the axial direction of the terminal and the housing of the battery cell 100.

[0047] Furthermore, the surface of the battery cell 100 where the positive terminal 1021 and the negative terminal 1022 are provided can abut against the side surface of the insulating bracket 210 facing the sealing cover 400, and the insulating bracket 210 supports the battery cell 100. In this way, the distance between the battery cell 100 and the insulating bracket 210 can be reduced, which helps to improve the space utilization rate in the height direction of the battery pack.

[0048] In some embodiments, referring to FIG. 4, a plurality of battery cells 100 are sequentially laid out along a first direction to form a battery cell sequence 1001, and the accommodation space 215 is dispersed along at least one side surface of the gas release component 200 in a second direction. The positive terminal 1021 of the battery cell 100 and / or the negative terminal 1022 of the battery cell 100 are arranged in corresponding accommodation spaces. The first direction intersects the second direction. For example, in the embodiment shown in FIG. 4, the first direction is perpendicular to the second direction.

[0049] The specific formation methods of the tray 300 and the insulating bracket 210 are not limited in the present disclosure. The tray 300 can be configured to include only a bottom plate, or the tray 300 can be configured to include a bottom plate and side beams disposed around the bottom plate. In this configuration, the amount of structural components in the battery pack can be reduced. This facilitates improving the integration of the battery pack, improving the energy density of the battery pack, and reducing the cost of the battery pack.

[0050] For example, in some embodiments, the bottom plate is configured as the insulating bracket 210. That is, the bottom plate and the insulating bracket 210 are the same component. Therefore, the amount of components in the battery pack can be reduced, which facilitates improving the integration of the battery pack.

[0051] Furthermore, the gas release component 200 can include a first sub-channel 2112 and a plurality of through-holes 213. The plurality of through-holes 213 are provided on the insulating bracket 210. The first sub-channel 2112 is provided within the insulating bracket 210 and communicates with the outside. The plurality of through-holes 213 are provided in a one-to-one correspondence with the first explosion prevention valves 101 of the plurality of battery cells 100, and all of the plurality of through-holes 213 communicate with the first sub-channel 2112. In this way, after the first explosion prevention valve 101 of the battery cell 100 is opened, the high-temperature gas in the battery cell 100 can enter the first sub-channel 2112 through the through-holes 213 and be released to the outside through the first sub-channel 2112. This can prevent the high-temperature gas from flowing directly upward and affecting the driver's cab, and reduce the harm to the passengers inside the vehicle.

[0052] In another embodiment, the bottom plate has a hollow region 302, and the insulating bracket 210 is disposed within the hollow region 302. The insulating bracket 210 can be joined to the tray 300. This design facilitates operation. Certainly, the insulating bracket 210 and the bottom plate can be fixed to each other by a channel hot melt connection or a screw connection. Further, the bottom plate is provided with a first exhaust channel 310, and the gas discharge component 200 communicates with the outside through the first exhaust channel 310. Specifically, the gas discharge component 200 includes a first sub-channel 2112 and a plurality of through-holes 213. The plurality of through-holes 213 are provided on the insulating bracket 210. The first sub-channel 2112 is provided within the insulating bracket 210. The plurality of through-holes 213 are provided in a one-to-one correspondence with the first explosion-proof valves 101 of the plurality of battery cells 100. All of the plurality of through-holes 213 communicate with the first sub-channel 2112, and the first sub-channel 2112 communicates with the first exhaust channel 310. In this way, after the first explosion-proof valve 101 of the battery cell 100 is opened, the high-temperature gas within the battery cell 100 can enter the first sub-channel 2112 through the through-holes 213 and be discharged to the outside through the first exhaust channel 310. This can prevent the high-temperature gas from flowing directly upward and affecting the driver's cab, reducing the harm to the passengers inside the vehicle.

[0053] Optionally, the diameter of the through-hole 213 may be larger than the diameter of the first explosion-proof valve 101. This configuration facilitates the rapid discharge of the high-temperature gas. It should be clarified herein that the diameter of the first explosion-proof valve 101 refers not to the size of the valve body but to the size of the area dispersed by the gas discharged from the valve.

[0054] In some embodiments, in order to discharge the high-temperature and high-pressure gas discharged from the first explosion-proof valve 101 through the gas discharge component 200, another explosion-proof valve can be disposed near the outer surface of the battery pack. Referring to FIGS. 9, 10, and 14, in some embodiments, the through-hole 213 on the insulating bracket 210 extends along the vertical direction (i.e., the height direction of the battery pack), and the gas discharged from the first explosion-proof valve 101 enters the first sub-channel 2112 through the through-hole 213 and enters the first exhaust channel 310. The second explosion-proof valve 301 is disposed at one end of the first exhaust channel 310 away from the gas discharge component 200. In this way, the high-temperature gas entering the first exhaust channel 310 can be discharged to the outside of the battery pack through the second explosion-proof valve 301 so as to avoid damage to another good battery cell 100 in the battery pack. It should be clarified herein that the vertical direction refers to the direction perpendicular to the surface of the tray 300. Further, in another embodiment, the through-hole 213 can be disposed to extend obliquely according to actual requirements.

[0055] In some embodiments, the gas release component 200 may further include a groove 2113. The groove 2113 is provided on the insulating bracket 210, and the groove 2113 is open to the side surface of the sealing cover 400. The through hole 213 is provided on the bottom wall 2114 of the groove, and the battery cell 100 abuts against the side wall 2115 of the groove 2113 to form a second sub-channel 2111 penetrating the enclosure. A first sub-channel 2112 is provided on the side surface of the insulating bracket 210 facing away from the sealing cover 400. The first sub-channel 2112 and the second sub-channel 2111 are provided on opposite sides and communicate with each other through the through hole 213. In this way, the high-temperature gas in the second sub-channel 2111 can enter the first sub-channel 2112 through the through hole 213 and be discharged to the outside through the first sub-channel 2112. In this design, when the battery cell 100 fails, the first explosion-proof valve 101 corresponding to the battery cell 100 releases the high-temperature and high-pressure gas in the battery cell 100. The gas flows through the second sub-channel 2111 and enters the first sub-channel 2112 away from another battery cell 100 through the through hole 213. This can prevent the high-temperature and high-pressure gas from remaining in the second sub-channel 2111 and damaging another good battery cell 100.

[0056] In some embodiments, a plurality of battery cells 100 are sequentially laid out along a first direction to form a battery cell sequence 1001. A plurality of battery cell sequences 1001 are arranged and laid out along a second direction, and a plurality of gas release components 200 are arranged and correspond to the plurality of battery cell sequences 1001 one-to-one, and the first direction is perpendicular to the second direction. In this way, the high-temperature gas in the battery cells 100 in the battery cell sequence 1001 can be discharged to the outside through the gas release component 200 corresponding to each battery cell sequence 1001 to reduce interaction.

[0057] In another embodiment, the insulating layer 21 is an insulating bracket 210, the tray 300 includes a bottom plate, and the insulating bracket 210 is disposed on the side surface of the bottom plate facing the sealing cover 400 (for example, the insulating bracket 210 abuts against the bottom plate by surface contact). The gas release component 200 can correspond to the position of the first explosion prevention valve 101 of the plurality of battery cells 100, and the gas released from the first explosion prevention valve 101 flows through the inside of the bottom plate 3001 through the gas release component and flows to the outside. The gas release component 200 can include a plurality of exhaust holes, and the plurality of exhaust holes are provided on the insulating bracket 210. A second exhaust channel is provided in the bottom plate 3001. The plurality of exhaust holes are provided in a one-to-one correspondence with the first explosion prevention valves 101 of the plurality of battery cells 100, and the plurality of exhaust holes communicate with the outside through the second exhaust channel. The gas discharged from the first explosion prevention valve 101 enters the second exhaust channel and is discharged through the exhaust holes.

[0058] According to some embodiments, the battery pack 10 can include at least one connection sheet 230. The connection sheet 230 can be disposed on the insulating layer 21, and the battery cells 100 can be electrically connected to each other through the connection sheet 230. The connection sheet and the insulating bracket may be integrally formed members, and / or the battery pack may further include at least one sampling member 231. The sampling member 231 is connected to the corresponding battery cell 100, and the sampling member 231 and the insulating bracket 210 are integrally formed. In this way, the amount of structural components in the battery pack can be reduced. This facilitates improving the integration of the battery pack, improving the energy density of the battery pack, and reducing the cost of the battery pack.

[0059] The sampling member 231 may be a sampling harness, an FPC (Flexible Printed Circuit), or a PCB board (Printed Circuit Board).

[0060] In the foregoing embodiment having the first sub-channel 2112 and the second sub-channel 2111, the integration of the first sub-channel 2112 and the second sub-channel 2111 is defined as the third exhaust channel 211. In this case, referring to FIGS. 11 to 13, the third exhaust channel 211 can be separated by the internal partition plate 212 into the second sub-channel 2111 near the first explosion prevention valve 101 and the first sub-channel 2112 away from the first explosion prevention valve 101. The partition plate 212 is provided with a through hole 213 at a position directly opposite to the first explosion prevention valve 101. In this design, when the battery cell 100 fails, the first explosion prevention valve 101 corresponding to the battery cell 100 releases the high-temperature and high-pressure gas in the battery cell 100. The gas flows through the second sub-channel 2111 and enters the first sub-channel 2112 away from another battery cell 100 through the through hole 213. This can prevent the high-temperature and high-pressure gas from staying in the second sub-channel 2111 and damaging another good battery cell 100.

[0061] In this embodiment, a first exhaust channel 310 communicating with the first sub-channel 2112 is provided on the tray 300, and the first exhaust channel 310 can be arranged on the side surface of the first sub-channel 2112. The first sub-channel 2112 and the first exhaust channel 310 are aligned in height and extend parallel to the bottom plate of the tray 300 respectively. The first exhaust channel 310 extends to the side end surface of the tray 300, and a second explosion prevention valve 301 is disposed at the end.

[0062] In this specification, the first sub-channel 2112 and the first exhaust channel 310 are aligned in height, and as a result, the first sub-channel 2112 and the first exhaust channel 310 are connected to facilitate the gas flow. Further, in another embodiment, the heights of the first sub-channel 2112 and the first exhaust channel 310 can be set according to the actual requirements where one is higher and the other is lower. In this case, another pipe-type component needs to be arranged between the first sub-channel 2112 and the first exhaust channel 310 for communication.

[0063] In the aforementioned case where the insulating bracket 210 needs to be mounted on the tray 300, in some embodiments, the insulating bracket 210 can be joined to the tray 300. Further, in another embodiment, the insulating bracket 210 and the tray 300 can be integrally formed. This is not limited in the present disclosure.

[0064] In the aforementioned embodiments, the gas can be discharged by the structure arranged on the insulating bracket 210 or by the structure arranged on the insulating bracket 210 and the tray 300, and the gas discharge path can be shortened. The airflow passing through the first explosion prevention valve 101 from the battery cell 100 can quickly flow outside the overall structure of the battery pack, avoiding gas accumulation in the battery pack and avoiding damage to another battery cell 100.

[0065] Please refer to FIGS. 8 to 10. In this embodiment of the present disclosure, the third exhaust channel 211 and the first exhaust channel 310 can each extend linearly along the first direction. Arranging the third exhaust channel 211 and the first exhaust channel 310 to extend along a straight line can reduce the difficulty of the manufacturing process and be more helpful for the use of the internal space of the battery pack. Further, in another embodiment, the extension paths of the third exhaust channel 211 and the first exhaust channel 310 can be set to curves, fold lines, etc. according to the actual use inside the battery pack. Referring to FIG. 5, in this embodiment of the present disclosure, a plurality of battery cells 100 can be dispersed in a matrix, and it should be clarified in this specification that the first direction may refer to the length direction of the rectangle (the direction of the arrow in the first direction in the figure). Further, in another embodiment, the first direction may also refer to the width direction or the diagonal direction of the rectangle. The present disclosure does not set specific limitations on the layout shape of the battery cells 100 and the first direction. The battery cells 100 can be arranged in any direction within the plane in which the insulating bracket 210 is arranged. The foregoing embodiments are merely examples for illustration purposes.

[0066] Furthermore, in order to enable all the gas discharged from the first explosion prevention valve 101 to enter the third exhaust channel 211, referring to FIG. 1, in this embodiment of the present disclosure, a plurality of third exhaust channels 211 can be arranged, spaced apart in a second direction perpendicular to the first direction, and the amount of the first exhaust channel 310 is the same as the amount of the third exhaust channel 211. Each third exhaust channel 211 corresponds to the first exhaust channel 310 communicating with the third exhaust channel 211. As a result, the gas in the third exhaust channel 211 can flow into the first exhaust channel 310 and be discharged through the second explosion prevention valve 301 at the end of the first exhaust channel 310. As described above, a plurality of third exhaust channels 211 can cover all the first explosion prevention valves 101. As a result, on the condition that the gas discharged from any first explosion prevention valve 101 can enter the third exhaust channel 211, the shape, amount, and layout method of the third exhaust channel 211 are not limited in the present disclosure.

[0067] In this embodiment of the present disclosure, each first explosion prevention valve 101 can correspond to the through-hole 213. As a result, the gas discharged from the first explosion prevention valve 101 can pass through the through-hole 213 and enter the first sub-channel 2112. Furthermore, in another embodiment, two or three adjacent first explosion prevention valves 101 can share one through-hole 213. In this case, the cross-section of the through-hole 213 may be strip-shaped. As a result, the gas discharged from the aforementioned two or three first explosion prevention valves 101 can pass through the through-hole 213.

[0068] In this embodiment of the present disclosure, referring to FIG. 1, a plurality of third exhaust channels 211 are arranged. The plurality of third exhaust channels 211 each extend linearly in a first direction and are spaced apart in a second direction perpendicular to the first direction. The insulating bracket 210 includes a plate component 214 connected to the side surface of the third exhaust channel 211, and the plate component 214 can connect the plurality of third exhaust channels 211 as a whole. Further, the plate component 214 can further provide an installation space for electronic components (such as the battery information collector 220) described below.

[0069] In this embodiment of the present disclosure, the plate component 214 can be aligned with the partition plate 212. In this design, during manufacturing, the plate component 214 and the partition plate 212 can be integrally formed to reduce the difficulty of the process. Further, in another embodiment, considering the installation space of other components, the plate component 214 and the partition plate 212 can be arranged in a structure where one is higher and the other is lower. This is not limited in the present disclosure.

[0070] In addition to the above-mentioned advantages, the plate component 214 and the third exhaust channel 211 can form the above-mentioned flat U-shaped groove structure (accommodation space 215).

[0071] In this embodiment of the present disclosure, the battery pack can further include a heat dissipation plate 610 having a flow path for flowing a heat dissipation medium. The heat dissipation medium may be a liquid or a refrigerant. A plurality of battery cells 100 can be laid out along a second direction to form a battery cell group 1002. A plurality of battery cell groups 1002 are arranged, and the plurality of battery cell groups 1002 are laid out along a first direction. The first direction is perpendicular to the second direction. The heat dissipation plate 610 is disposed between any two adjacent battery cell groups 1002, and the heat dissipation plate 610 is thermally connected to two corresponding battery cell groups 1002. By disposing the heat dissipation plate 610 between two adjacent battery cell groups 1002, the heat generated by the battery cells 100 during operation can be quickly dissipated, and potential safety problems caused by excessive temperature inside the battery pack can be avoided. The thermal connection can be understood as direct contact or connection via a thermally conductive adhesive.

[0072] Furthermore, in order to increase the heat dissipation area, in this embodiment of the present disclosure, the second direction is the width direction of the battery cell 100, the first direction is the thickness direction of the battery cell 100, and the width of the battery cell 100 may be larger than the thickness of the battery cell 100. In this design, the battery cell 100 and the heat dissipation plate 610 can have a larger contact heat dissipation area to improve the heat dissipation efficiency. Furthermore, in another embodiment, the battery cell 100 can also be configured to have a thickness larger than the width. In this case, the heat dissipation plate 610 is disposed on the surface corresponding to the thickness. This is not limited in the present disclosure.

[0073] Please refer to FIG. 5. In this embodiment of the present disclosure, the outer surface of the battery cell 100 can include two first surfaces 110 facing each other along a first direction, two second surfaces 120 facing each other along a second direction, and two third surfaces 130 facing each other along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. Among the first surface 110, the second surface 120, and the third surface 130, the first surface 110 has the largest area, and the heat dissipation plate 610 is thermally connected to the first surface 110 of the battery cells 100 within two corresponding battery cell groups 1002. Since the first surface 110 of the battery cell 100 has the largest area, the thermal connection between the heat dissipation plate 610 and the first surface 110 can ensure the largest heat dissipation area and the best heat dissipation effect. The heat dissipation plate 610 can be thermally connected to the battery cell 100. On the condition that the required heat dissipation for the battery cell 100 is realized, the specific shape of the battery cell 100 and the surface size relationship are not limited in the present disclosure. The specific layout method of the heat dissipation plate 610 can be adjusted according to actual requirements. In some embodiments, the first direction is the thickness direction of the battery cell, the second direction is the width direction of the battery cell, and the third direction is the height direction of the battery cell. The height direction of the battery cell is the same as the height direction of the battery pack, that is, it coincides with the height direction of the vehicle. The width and height of the battery cell are each larger than the thickness of the battery cell. When the first direction coincides with the width direction of the battery pack, the second direction coincides with the length direction of the battery pack. When the first direction coincides with the length direction of the battery pack, the second direction coincides with the width direction of the battery pack. Further, the width direction of the battery pack may coincide with the width direction of the vehicle, and the length direction of the battery pack coincides with the length direction of the vehicle.

[0074] Please refer to FIGS. 11 and 12. In this embodiment of the present disclosure, the battery pack 10 can include at least one connection sheet 230. The connection sheet 230 can be disposed on the insulating layer 21, and the battery cells 100 can be electrically connected to each other through the connection sheet 230. The battery pack can further include a battery information collector 220 and a circuit board 240 separately connected to the battery information collector 220 and the connection sheet 230. The battery information collector 220, the connection sheet 230, and the circuit board 240 can be separately fixed to the insulating bracket 210. In this specification, the battery information collector 220 can monitor and acquire information such as the temperature and pressure of the battery cells 100 in real time and transfer the acquired information to the circuit board 240. When receiving abnormal temperature or pressure information, the circuit board 240 can control another component (for example, a speaker and an indicator) to create an alarm, so that the battery cells 100 can be replaced when the battery cells 100 are abnormal. A plurality of battery cells 100 are connected in series or in parallel through the corresponding connection sheets 230. In this embodiment of the present disclosure, the electrical connection sheet 230 can be welded to the terminals of the battery cells 100.

[0075] Furthermore, in this embodiment of the present disclosure, the connection sheet 230 and the circuit board 240 can be separately integrated into the insulating bracket 210, and the connection sheet 230 and the circuit board 240 can be integrally formed with the insulating bracket 210. The connection sheet 230 can be fixed to the side surface of the insulating bracket 210 facing the battery cells 100 for connecting to the terminals of the battery cells 100. The circuit board 240 is incorporated into the insulating bracket 210, and the battery information collector 220 can be fixed to the side surface of the insulating bracket 210 facing away from the battery cells 100.

[0076] The battery information collector 220 in the present disclosure can be uniformly laid out among a plurality of third exhaust channels 211, for example, mounted on the plate component 214. Further, in another embodiment, the layout position and manner of the battery information collector 220 can be adaptively modified according to actual requirements. This is not limited in the present disclosure.

[0077] In this embodiment of the present disclosure, the connection sheet 230 can be integrally hot-pressed with respect to the insulating bracket 210. Further, in another embodiment, the connection sheet 230 can be further connected to the insulating bracket 210 by bolts or the like.

[0078] Please refer to FIG. 1. In this embodiment of the present disclosure, the battery cell 100 can be connected to the connection sheet 230 only by terminals, and as a result, the battery cell 100 is fixed to the insulating bracket 210. Further, in another embodiment, in order to increase the connection strength between the battery cell 100 and the insulating bracket 210 and prevent the separation between the battery cell 100 and the insulating bracket 210 due to an external force, the battery cell 100 and the insulating bracket 210 can be further mechanically or chemically connected through, for example, bonding, bolting, etc. Since the connection method is well known to those skilled in the art, the details are not described in this specification.

[0079] In this embodiment of the present disclosure, the insulating bracket 210 may be made of an SMC material in order to ensure the structural strength of the insulating bracket 210 and improve the stability of the components mounted on the insulating bracket 210. The material has advantages such as high mechanical strength and high insulation strength. Further, in another embodiment, the insulating bracket 210 may be made of another material having the above-mentioned advantages. This is not limited in the present disclosure.

[0080] To enable real-time cooling and heat dissipation of components such as battery cell 100 during the use of the battery pack, referring to FIG. 1, in this embodiment of the present disclosure, the battery pack can further include an expansion beam 500 and a cooling plate 600 disposed in the accommodation cavity. The expansion beam 500 is disposed adjacent to a plurality of battery cells 100, and the expansion beam 500 is fixed to the tray 300. The cooling plate 600 is pressed against the side surface of the battery cell 100 facing the sealing cover, and the cooling plate 600 is fixedly connected to the expansion beam. In this way, the cooling plate 600 can limit the battery cell 100 and can cool the battery cell 100.

[0081] The specific form of the cooling plate 600 is not limited in the present disclosure. For example, in this embodiment of the present disclosure, the cooling plate 600 may be a liquid container provided with a plurality of pipe connectors 800, and the water circulation through the inflow and outflow of water in the plurality of pipe connectors 800 is completed. Further, in another embodiment, the cooling plate 600 can also perform cooling by gas circulation.

[0082] In this embodiment of the present disclosure, the arrangement of the expansion beam 500 adjacent to the plurality of battery cells 100 means that the expansion beam 500 can contact the battery cell 100 directly or indirectly. The expansion beam 500 is well known to those skilled in the art and will not be described herein.

[0083] Please refer to FIG. 1. In this embodiment of the present disclosure, the battery pack can further include a distribution box 700 disposed in the accommodation cavity.

[0084] Please refer to FIG. 16. According to a second aspect of the present disclosure, a vehicle 900 is provided that includes a vehicle body 910 and the aforementioned battery pack 10. The tray 300 is fixedly connected to the vehicle body 910, or the vehicle body 910 is integrally formed with the tray 300 or the sealing cover 400. The vehicle body 910 may be the vehicle frame or chassis of the vehicle 900. The vehicle 900 has all the beneficial effects of the battery pack 10, and details will not be described again herein.

[0085] The implementation of the present disclosure will be described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the foregoing implementation, and within the scope of the technical concept of the present disclosure, a plurality of simple modifications can be made to the technical solution of the present disclosure, and such simple modifications are included within the protection scope of the present disclosure.

[0086] It should be further noted that the specific technical features described in the foregoing specific implementation can be combined in any appropriate manner in a non - conflicting case. To avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.

[0087] Furthermore, various implementations of the present disclosure can also be arbitrarily combined without departing from the concept of the present disclosure, and such combinations shall still be regarded as the content disclosed in the present disclosure.

Description of Reference Numerals

[0088] 10 Battery pack 100 Battery cell 1001 Battery cell sequence 1002 Battery cell group 101 First explosion - prevention valve 102 Terminal 1021 Positive terminal 1022 Negative terminal 110 First surface 120 Second surface 130 Third surface 200 Gas emission component 21 Insulation layer 210 Insulation bracket 211 Third exhaust channel 2111 Second sub-channel 2112 First sub-channel 2113 Groove 2114 Bottom wall 2115 Side wall 212 Partition plate 213 Through hole 214 Plate component 215 Accommodation space 220 Battery information collector 230 Connection sheet 231 Sample component 240 Circuit board 300 Tray 3001 Bottom plate 301 Second explosion-proof valve 302 Hollow region 310 First exhaust channel 400 Sealing cover 500 Expansion beam 600 Cooling plate 610 Heat dissipation plate 700 Distribution box 800 Pipe connector 900 Vehicle 910 Vehicle body

Claims

1. A sealing cover (400), A tray (300) connected to the sealing cover (400) to define a receiving cavity, A plurality of battery cells (100) disposed in the receiving cavity, wherein a first explosion prevention valve (101) is disposed on a side surface of the battery cell (100) facing away from the sealing cover (400), and the plurality of battery cells (100), An insulating layer (21) disposed on the side surface of the battery cell (100) facing away from the sealing cover (400), wherein a gas release component (200) is disposed on the insulating layer (21), and the gas release component (200) communicates the outside with the first explosion prevention valve (101), and the insulating layer (21), A battery pack (10) comprising.

2. Further comprising at least one connection sheet (230), wherein the connection sheet (230) is disposed on the insulating layer (21), and the battery cells (100) are electrically connected to each other through the connection sheet (230). The battery pack (10) according to claim 1.

3. The insulating layer (21) is an insulating bracket (210), the tray (300) comprises a bottom plate (3001), and the bottom plate (3001) is configured as the insulating bracket (210). The battery pack (10) according to claim 1 or 2.

4. The gas release component (200) includes a first sub-channel (2112) and a plurality of through-holes (213). The plurality of through-holes (213) are provided on the insulating bracket (210). The first sub-channel (2112) is provided within the insulating bracket (210) and communicates with the outside. The plurality of through-holes (213) are provided in a one-to-one correspondence with the first explosion prevention valves (101) of the plurality of battery cells (100). All of the plurality of through-holes (213) communicate with the first sub-channel (2112). The battery pack (10) according to claim 3.

5. The insulating layer (21) is the insulating bracket (210). The tray (300) includes a bottom plate (3001). The bottom plate (3001) has a hollow region (302). The insulating bracket (210) is disposed within the hollow region (302). The battery pack (10) according to claim 1 or 2.

6. A first exhaust channel (310) is disposed within the bottom plate (3001). The gas release component (200) communicates with the outside through the first exhaust channel (310). The battery pack (10) according to claim 5.

7. The gas release component (200) includes a first sub-channel (2112) and a plurality of through-holes (213). The plurality of through-holes (213) are provided on the insulating bracket (210). The first sub-channel (2112) is provided within the insulating bracket (210). The plurality of through-holes (213) are provided in a one-to-one correspondence with the first explosion prevention valves (101) of the plurality of battery cells (100). All of the plurality of through-holes (213) communicate with the first sub-channel (2112). The first sub-channel (2112) communicates with the first exhaust channel (310). The battery pack (10) according to claim 6.

8. The gas release component (200) further includes a groove (2113), the groove (2113) is provided on the insulating bracket (210), the groove (2113) opens to the side surface of the sealing cover (400), the through hole (213) is provided on the bottom wall (2114) of the groove (2113), the battery cell (100) abuts against the side wall (2115) of the groove (2113), forming a second sub-channel (2111) penetrating the enclosure, the first sub-channel (2112) is provided on the side surface of the insulating bracket (210) facing away from the sealing cover (400), the first sub-channel (2112) and the second sub-channel (2111) are provided on opposite sides and communicate with each other through the through hole (213). The battery pack (10) according to claim 4 or 7.

9. The plurality of battery cells (100) are sequentially laid out along a first direction to form a battery cell sequence (1001), a plurality of battery cell sequences (1001) are arranged, sequentially laid out along a second direction, a plurality of gas release components (200) are arranged, and the plurality of battery cell sequences (1001) are in one-to-one correspondence. The first direction is perpendicular to the second direction. The battery pack (10) according to claim 8.

10. A second explosion prevention valve (301) is arranged at the end of the first exhaust channel (310) away from the gas release component. The battery pack (10) according to claim 6 or 7.

11. The insulating bracket (210) is joined to the tray (300). The battery pack (10) according to any one of claims 5 to 7 and 10.

12. The diameter of the through hole (213) is larger than the diameter of the first explosion prevention valve (101). The battery pack (10) according to claim 4 or 7.

13. The insulating layer (21) is an insulating bracket (210), the tray (300) includes a bottom plate (3001), the insulating bracket (210) is disposed on a side surface of the bottom plate (3001) facing the sealing cover (400), the gas discharge component (200) includes a plurality of exhaust holes, the plurality of exhaust holes are provided on the insulating bracket (210), a second exhaust channel is provided in the bottom plate (3001), the plurality of exhaust holes are provided in a one-to-one correspondence with first explosion prevention valves (101) of the plurality of battery cells (100), and the plurality of exhaust holes communicate with the outside through the second exhaust channel. The battery pack (10) according to claim 1 or 2.

14. Comprising at least one connection sheet (230), the connection sheet (230) is disposed on the insulating layer (21), and the battery cells (100) are electrically connected to each other through the connection sheet (230). The battery cell has a positive terminal (1021) and a negative terminal (1022), the positive terminal (1021) and the negative terminal (1022) are disposed on a side surface of the corresponding battery cell (100) facing away from the sealing cover (400), and at least one connection sheet (230) is electrically connected to a positive terminal (1021) of one of the corresponding two battery cells (100) and a negative terminal (1022) of the other. The battery pack (10) according to any one of claims 3 to 13.

15. A side surface of the insulating bracket (210) facing the sealing cover (400) has an accommodation space (215), and the positive terminal (1021) of the battery cell (100) and / or the negative terminal (1022) of the battery cell (100) are disposed in the accommodation space (215). The battery pack (10) according to claim 14.

16. The battery pack (10) according to claim 15, wherein the depth of the accommodation space (215) is equal to or greater than the length of the positive terminal (1021) or the negative terminal (1022) of the corresponding battery cell (100).

17. The battery pack (10) according to claim 15 or 16, wherein the surface of the battery cell (100) where the positive terminal (1021) and the negative terminal (1022) are provided abuts against the side surface of the insulating bracket (210) facing the sealing cover (400), and the insulating bracket (210) supports the battery cell (100).

18. The battery pack (10) according to any one of claims 15 to 17, wherein the plurality of battery cells (100) are sequentially laid out along the first direction to form the battery cell sequence (1001), the accommodation space (215) is dispersed along the second direction on at least one side surface of the gas release component (200), the positive terminal (1021) of the battery cell (100) and / or the negative terminal (1022) of the battery cell (100) are arranged in the corresponding accommodation space (215), and the first direction is perpendicular to the second direction.

19. Comprising at least one connection sheet (230), the connection sheet (230) is disposed on the insulating layer (21), and the battery cells (100) are electrically connected to each other through the connection sheet (230), The connection sheet (230) and the insulating bracket (210) are integrally formed, and / or The battery pack further comprises at least one sampling member (231), the sampling member (2311) is connected to the corresponding battery cell (100), and the sampling member (231) and the insulating bracket (210) are integrally formed. The battery pack (10) according to any one of claims 3 to 18.

20. The battery pack (10) according to claim 19, wherein the sampling member (231) is a sampling harness, an FPC, or a PCB board.

21. Comprising at least one connection sheet (230), the connection sheet (230) being disposed on the insulating layer (21), and the battery cells (100) being electrically connected to each other through the connection sheet (230). The battery pack (10) further comprises a battery information collector (220) and a circuit board (240) separately connected to the battery information collector (220) and the connection sheet (230), and the battery information collector (220), the connection sheet (230), and the circuit board (240) are respectively fixed to the insulating bracket (210). The battery pack (10) according to any one of claims 3 to 20.

22. The connection sheet (230) and the circuit board (240) are integrated on the insulating bracket (210), the connection sheet (230) and the circuit board (240) are integrally formed with the insulating bracket (210), the connection sheet (230) is fixed to a side surface of the insulating bracket (230) facing the battery cell (100), the circuit board 240 is incorporated into the insulating bracket (210), and the battery information collector (220) is fixed to a side surface of the insulating bracket (210) facing away from the battery cell (100). The battery pack (10) according to claim 21.

23. Further comprising a heat dissipation plate (610) having a flow path for flowing a cooling medium, wherein the plurality of battery cells (100) are laid out along the second direction to form a battery cell group (1002), a plurality of battery cell groups (1002) are arranged, the plurality of battery cell groups (1002) are laid out along the first direction, the first direction is perpendicular to the second direction, the heat dissipation plate (610) is disposed between any two adjacent battery cell groups (1002), and the heat dissipation plate (610) is thermally connected to two corresponding battery cell groups (1002). The battery pack (10) according to claims 1 to 22.

24. The second direction is the width direction of the battery cell (100), the first direction is the thickness direction of the battery cell (100), and the width of the battery cell (100) is larger than the thickness of the battery cell (100). The battery pack (10) according to claim 23.

25. The outer surface of the battery cell (100) includes two first surfaces (110) facing each other along the first direction, two second surfaces (120) facing each other along the second direction, and two third surfaces (130) facing each other along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other. On the first surface (110), the second surface (120), and the third surface (130), the first surface (110) has the largest area, and the heat dissipation plate (610) is thermally connected to the first surface (110) of each battery cell (100) in two corresponding battery cell groups (1002). The battery pack (10) according to claim 24.

26. Further comprising an expansion beam (500) and a cooling plate (600) disposed in the accommodation cavity, wherein the expansion beam (500) is disposed adjacent to the plurality of battery cells (100), the expansion beam (500) is fixed to the tray (300), the cooling plate (600) is pressed against the side surface of the battery cell (100) facing the sealing cover (400), and the cooling plate (600) is fixedly connected to the expansion beam (500). The battery pack (10) according to any one of claims 1 to 25.

27. A vehicle (900) comprising a vehicle body (910) and the battery pack (10) according to any one of claims 1 to 26, wherein the tray (300) is fixedly connected to the vehicle body (910), or the vehicle body (910) is integrally formed with the tray (300) or the sealing cover (400).

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