Battery pack

Abstract

The utility model discloses a battery pack which comprises a shell, a first end plate, a bottom protection plate, a battery module and electrical equipment, and the shell defines a containing cavity; the first end plate is located in the containing cavity and used for dividing the containing cavity into a first containing cavity and a second containing cavity which are arranged in the second direction, and the first containing cavity comprises a first sub-cavity and a second sub-cavity; the battery modules are located in the first containing cavity, the first battery module of the battery modules is located in the first sub-cavity, the first sub-cavity is provided with a first exhaust channel opposite to the first anti-explosion valve, the second battery module is located in the second sub-cavity, the second shell is provided with an open hole opposite to the second anti-explosion valve, and the bottom protection plate is provided with a second exhaust channel opposite to the open hole. The electrical equipment is located in the second containing cavity. According to the battery pack disclosed by the utility model, the first battery module and the second battery module are arranged in the first accommodating cavity, and the electrical equipment is arranged in the second accommodating cavity, so that thermoelectric separation can be realized, and the safety of the battery pack is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] In the related technology, during the design of double-layer module batteries, due to the lack of a dedicated exhaust and pressure relief channel, when a battery cell of the battery module experiences thermal runaway, the explosion-proof valve of the battery cell will release a large amount of high-temperature gas, which can easily cause thermal runaway in other electrical components, resulting in problems such as the spread and spread of thermal runaway. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a battery pack that can achieve thermal and electrical separation, thereby improving the safety of the battery pack.

[0004] According to an embodiment of the present invention, the battery pack includes: a shell, the shell includes a first shell and a second shell stacked along a first direction, the first shell and the second shell jointly define a accommodating chamber; a first end plate, the first end plate is located in the accommodating chamber, and is used to separate the accommodating chamber into a first accommodating chamber and a second accommodating chamber arranged along a second direction, the first accommodating chamber includes a first sub-cavity and a second sub-cavity stacked along the first direction; a bottom guard plate, the bottom guard plate is located on the side of the second shell away from the first shell; a battery module, the battery module is located in the first accommodating chamber, the battery module includes a first battery module and a second battery module stacked along the first direction, the first battery module is located in the first sub-cavity, the first sub-cavity has a first exhaust channel opposite to the first explosion-proof valve of the first battery module, the second battery module is located in the second sub-cavity, the second shell has an opening opposite to the second explosion-proof valve of the second battery module, and the bottom guard plate has a second exhaust channel opposite to the opening; an electrical device, the electrical device is located in the second accommodating chamber; wherein the first direction is perpendicular to the second direction.

[0005] According to the battery pack of the embodiment of the present invention, a first end plate is provided in the accommodating cavity to separate the accommodating cavity into a first accommodating cavity and a second accommodating cavity. The first accommodating cavity is provided with a first battery module and a second battery module, and the second accommodating cavity is provided with an electrical device. When the first battery module or the second battery module has thermal runaway, the high-temperature gas discharged from the first battery module or the second battery module can be exhausted through the first exhaust channel or the second exhaust channel in the first accommodating cavity, thereby realizing thermal and electrical separation, thereby improving the safety of the battery pack.

[0006] According to some embodiments of the present invention, the first explosion-proof valve is located on a side of the first battery module facing away from the second battery module, and the first shell has an avoidance groove opposite to the first explosion-proof valve, and the avoidance groove is the first exhaust channel.

[0007] According to some embodiments of the present invention, the battery pack further includes: a plurality of support members, wherein the plurality of support members are located between the second shell and the bottom guard plate, the second explosion-proof valve is located on the side of the second battery module away from the first battery module, and the second exhaust channel is provided between two adjacent support members.

[0008] According to some embodiments of the present invention, the battery pack also includes: a second end plate, the second end plate is located on the side of the battery module facing away from the electrical device, the second end plate is abutted against the top plate of the first shell and the bottom plate of the second shell, and a third exhaust channel is provided between the shell and the second end plate and is connected to both the first exhaust channel and the second exhaust channel.

[0009] According to some embodiments of the present invention, the shell includes a side plate opposite to the second end plate, and the first end plate has a first protrusion and a second protrusion on the side facing the side plate, and the first protrusion and the second protrusion are both abutted against the side plate to construct the third exhaust channel between the first protrusion and the second protrusion.

[0010] According to some embodiments of the present invention, a buffer is provided between the first protrusion and the second protrusion and the side plate.

[0011] According to some embodiments of the present invention, a main explosion-proof valve is provided on the side panel.

[0012] According to some embodiments of the present invention, the top plate has an avoidance groove, which is the first exhaust channel. The avoidance groove extends to an end of the top plate away from the electrical equipment, so that the first exhaust channel is connected to the third exhaust channel.

[0013] According to some embodiments of the present invention, the bottom plate has a through hole connecting the first exhaust channel and the second exhaust channel.

[0014] According to some embodiments of the present invention, the battery pack further includes: a liquid cooling plate, which is located in the first accommodating cavity and is used to separate the first accommodating cavity into the first sub-cavity and the second sub-cavity.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a schematic diagram of a battery pack according to some embodiments of the present invention;

[0018] Figure 2 yes Figure 1 Exploded view of the battery pack;

[0019] Figure 3 yes Figure 1 An exploded view of the battery pack from another angle;

[0020] Figure 4 yes Figure 1 An exploded view of the first shell and the second shell of the battery pack;

[0021] Figure 5 yes Figure 1 A top view of the middle battery module and the second shell;

[0022] Figure 6 yes Figure 1 Bottom view of the middle battery module and the second shell;

[0023] Figure 7 yes Figure 1 A top view of the battery pack;

[0024] Figure 8 yes Figure 7 Sectional view along line AA;

[0025] Figure 9 yes Figure 7 Cross-sectional view along line BB;

[0026] Figure 10 yes Figure 7 Cross-sectional view along CC line;

[0027] Figure 11 yes Figure 1 An enlarged view of part of the structure of the battery pack;

[0028] Figure 12 is a schematic diagram of a battery cell according to some embodiments of the present invention.

[0029] Reference numerals:

[0030] 100. Battery pack;

[0031] 10. Housing; 11. First housing; 111. Top plate; 1111. Avoidance groove; 1112. First exhaust passage; 12. Second housing; 121. Bottom plate; 122. Through hole; 123. Opening; 13. Accommodation chamber; 131. First accommodation chamber; 132. Second accommodation chamber; 14. Side plate; 141. Main explosion-proof valve; 15. Third exhaust passage;

[0032] 20. Bottom guard plate; 21. Support member; 22. Second exhaust channel;

[0033] 30. Battery module; 31. First battery module; 311. First explosion-proof valve; 32. Second battery module; 321. Second explosion-proof valve; 33. Battery cell;

[0034] 41. First end plate; 411. First plate; 412. Second plate; 42. Second end plate; 421. Third plate; 422. Fourth plate; 423. First protrusion; 424. Second protrusion;

[0035] 50. Liquid cooling plate. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] Reference below Figures 1-12 A battery pack 100 according to an embodiment of the present invention is described.

[0040] According to the battery pack 100 of the embodiment of the present invention, the battery pack 100 includes a housing 10, a first end plate 41, a bottom guard plate 20, a battery module 30 and an electrical device. The housing 10 includes a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are arranged along a first direction (for example, referring to the attached Figure 1 The first shell 11 and the second shell 12 are stacked (in the direction e1 in the figure, where the first direction can be the vertical direction). The first shell 11 and the second shell 12 together define a receiving chamber 13. For example, the edges of the first shell 11 and the second shell 12 can be fixedly connected by bolts. For example, the material of the upper shell 10 can be PCM / RTM.

[0041] The first end plate 41 is located in the accommodating cavity 13. The first end plate 41 is used to divide the accommodating cavity 13 into two sections along the second direction (for example, Figure 1 The first and second accommodating cavities 131, 132 are arranged in a direction e2 (the first direction can be the front-to-back direction or the left-to-right direction). The battery module 30 is located in the first accommodating cavity 131, and the electrical equipment is located in the second accommodating cavity 132. This allows the battery module 30 and the electrical equipment to be installed without being connected to each other. The first direction is perpendicular to the second direction.

[0042] For example, the first end plate 41 includes a first plate body 411 and a second plate body 412 stacked along a first direction, the second plate body 412 is fixedly connected to the second shell 12 , and the first plate body 411 is fixedly connected to the second plate body 412 .

[0043] The bottom guard plate 20 is located on the side of the second shell 12 away from the first shell 11 , that is, the bottom guard plate 20 is located at the bottom of the second shell 12 and is used to protect the bottom of the battery pack 100 and prevent the battery module 30 from being bumped by the outside.

[0044] The first accommodating cavity 131 includes a first sub-cavity and a second sub-cavity stacked along a first direction. The first sub-cavity may be defined between the first housing 11 and the first plate 411, or the second sub-cavity may be defined between the second housing 12 and the second plate 412. The battery module 30 includes a first battery module 31 and a second battery module 32 stacked along the first direction. The first battery module 31 is located in the first sub-cavity, and the second battery module 32 is located in the second sub-cavity.

[0045] The first battery module 31 has a first explosion-proof valve 311, which can be located on one side of the first battery module 31 in the first direction or on one side of the first battery module 31 in the second direction. The first sub-chamber has a first exhaust channel 1112 opposite the first explosion-proof valve 311. When thermal runaway occurs in the first battery module 31, the high-temperature gas exhausted through the first explosion-proof valve 311 can be discharged into the first exhaust channel 1112. The first exhaust channel 1112 is located in the first sub-chamber of the first accommodating chamber 131, which can separate the first exhaust channel 1112 from the electrical equipment, thereby achieving thermal and electrical separation, preventing the high-temperature gas exhausted from the first explosion-proof valve 311 from being transmitted to the electrical equipment and causing damage to the electrical equipment.

[0046] The second battery module 32 has a second explosion-proof valve 321, which is located on one side of the first battery module 31 in the first direction. The second housing 12 has an opening 123 opposite the second explosion-proof valve 321, and the bottom guard plate 20 has a second exhaust channel 22 opposite the opening 123. That is, the second explosion-proof valve 321 is arranged toward the bottom guard plate 20. When the second battery module 32 experiences thermal runaway, the high-temperature gas exhausted through the second explosion-proof valve 321 can be discharged into the second exhaust channel 22. The second exhaust channel 22 is located in the second sub-cavity of the first accommodating cavity 131, which can achieve separation between the second exhaust channel 22 and the electrical equipment, thereby achieving thermal and electrical separation, preventing the high-temperature gas exhausted from the second explosion-proof valve 321 from being transmitted to the electrical equipment and causing damage to the battery equipment.

[0047] A first end plate 41 is provided in the accommodating cavity 13 to separate the accommodating cavity 13 into a first accommodating cavity 131 and a second accommodating cavity 132. The first accommodating cavity 131 is provided with a first battery module 31 and a second battery module 32, and the second accommodating cavity 132 is provided with electrical equipment. When thermal runaway occurs in the first battery module 31 or the second battery module 32, the high-temperature gas discharged from the first battery module 31 or the second battery module 32 can be exhausted through the first exhaust channel 1112 or the second exhaust channel 22 in the first accommodating cavity 131, thereby realizing thermal and electrical separation, thereby improving the safety of the battery pack 100.

[0048] According to the battery pack 100 of the embodiment of the present invention, a first end plate 41 is provided in the accommodating cavity 13 to separate the accommodating cavity 13 into a first accommodating cavity 131 and a second accommodating cavity 132. The first accommodating cavity 131 is provided with a first battery module 31 and a second battery module 32, and the second accommodating cavity 132 is provided with an electrical device. When the first battery module 31 or the second battery module 32 has thermal runaway, the high-temperature gas discharged from the first battery module 31 or the second battery module 32 can be exhausted through the first exhaust channel 1112 or the second exhaust channel 22 in the first accommodating cavity 131, thereby realizing thermal and electrical separation, thereby improving the safety of the battery pack 100.

[0049] According to some embodiments of the present invention, referring to Figures 1-10 The first explosion-proof valve 311 is located on a side of the first battery module 31 facing away from the second battery module 32. The first battery module 31 and the second battery module 32 are stacked along a first direction, which can be an up-down direction. That is, the first explosion-proof valve 311 is located above the first battery module 31. The first shell 11 has an escape groove 1111 opposite the first explosion-proof valve 311. The escape groove 1111 serves as a first exhaust channel 1112. The first exhaust channel 1112 is provided on the top plate 111 of the first shell 11. When thermal runaway occurs in the first battery module 31, high-temperature gas within the first battery module 31 is discharged through the first exhaust channel 1112. The first exhaust channel 1112 is provided away from the second battery module 32 to prevent the high-temperature gas from flowing into the second battery module 32 and damaging it.

[0050] For example, mica paper is pasted on the inner wall of the avoidance groove 1111, and the mica paper can play the role of high temperature resistance and insulation.

[0051] In a specific example, the first battery module 31 includes a plurality of battery cells 33 arranged along the second direction, each battery cell 33 has two explosion-proof valves, and the explosion-proof valves of the plurality of battery cells 33 are arranged in sequence to form two rows of first explosion-proof valves 311. Correspondingly, the top plate 111 of the first shell 11 has two avoidance grooves 1111 opposite to the first explosion-proof valves 311. The two avoidance grooves 1111 are arranged along the third direction (for example, refer to the attached FIG. Figure 1 In the e3 direction, the first direction can be the front-to-back direction or the left-to-right direction).

[0052] According to some embodiments of the present invention, referring to Figures 1-10The battery pack 100 also includes multiple support members 21 located between the second housing 12 and the bottom guard plate 20. A second explosion-proof valve 321 is located on the side of the second battery module 32 facing away from the first battery module 31. A second exhaust passage 22 is defined between two adjacent support members 21. The support members 21 not only define the second exhaust passage 22 on the bottom guard plate 20 but also cushion and absorb impact forces when the bottom of the battery pack 100 is impacted, protecting the battery modules 30 within the battery pack 100 from collision. For example, the support members 21 may be made of supporting foam.

[0053] For example, mica paper is pasted on the position of the second explosion-proof valve 321 corresponding to the bottom guard plate 20. The mica paper can play the role of high temperature resistance and insulation.

[0054] In a specific example, the second battery module 32 includes a plurality of battery cells 33 arranged along the second direction, each battery cell 33 has two explosion-proof valves, and the explosion-proof valves of the plurality of battery cells 33 are arranged in sequence to form two rows of second explosion-proof valves 321. Correspondingly, there are three support members 21, and a second exhaust channel 22 is provided between two adjacent support members 21, that is, there are two second exhaust channels 22, and the two second exhaust channels 22 are arranged along the third direction.

[0055] According to some embodiments of the present invention, referring to Figures 1-10 The battery pack 100 also includes a second end plate 42, which is located on the side of the battery module 30 away from the electrical equipment. The second end plate 42 is abutted against the top plate 111 of the first shell 11 and the bottom plate 121 of the second shell 12. A third exhaust channel 15 is provided between the shell 10 and the second end plate 42. The third exhaust channel 15 is connected to the first exhaust channel 1112 and the second exhaust channel 22. The third exhaust channel 15 can realize the high-temperature gas in the first exhaust channel 1112 and the high-temperature gas in the second exhaust channel 22, and finally discharge the battery pack 100 through the total explosion-proof valve 141 on the side wall of the third exhaust channel 15, which can save the setting of the total explosion-proof valve 141.

[0056] For example, a window can be opened at a position corresponding to the second end plate 42 and the first exhaust channel 1112, so that the first exhaust channel 1112 and the second exhaust channel 22 are connected; a through hole 122 can also be opened on the bottom plate 121 of the second shell 12, so that the second exhaust channel 22 and the second exhaust channel 22 are connected.

[0057] According to some embodiments of the present invention, referring to Figures 1-10The shell 10 includes a side plate 14 opposite to the second end plate 42, and the second end plate 42 has a first protrusion 423 and a second protrusion 424 on the side facing the side plate 14. The first protrusion 423 and the second protrusion 424 are both in contact with the side plate 14 to construct a third exhaust channel 15 between the first protrusion 423 and the second protrusion 424.

[0058] The first explosion-proof valve 311 of the first battery module 31 is located on the side of the first battery module 31 away from the second battery module 32. A bus device of the battery module 30 is provided on one side of the third direction of the battery module 30. The first protrusion 423 and the second protrusion 424 are used to separate the third exhaust channel 15 from the bus of the battery module 30 to avoid arcing between the high-temperature gas and the bus when the battery module 30 thermally runs away, thereby aggravating the thermal runaway.

[0059] For example, the second end plate 42 includes a third plate 421 and a fourth plate 422 stacked along a first direction, the first direction is the up and down direction, that is, the third plate 421 and the fourth plate 422 are arranged along the up and down direction, the fourth plate 422 is fixedly connected to the second shell 12, and the third plate 421 is fixedly connected to the fourth plate 422.

[0060] According to some embodiments of the present invention, referring to Figures 1-10 A buffer is provided between the first protrusion 423 and the second protrusion 424 and the side plate 14 to further seal the gap between the first protrusion 423 and the second protrusion 424 and the side plate 14, thereby further preventing high-temperature gas from flowing to the busbar of the battery module 30. For example, the buffer may be foam.

[0061] According to some embodiments of the present invention, referring to Figures 1-10 The side panel 14 is provided with a main explosion-proof valve 141, that is, the main explosion-proof valve 141 is located on the side wall of the third exhaust channel 15. The high-temperature gas in the third exhaust channel 15 can be discharged through the main explosion-proof valve 141. For example, two main explosion-proof valves 141 can be provided, and the two main explosion-proof valves 141 can be arranged along the third direction to increase the release rate of the high-temperature gas in the third exhaust channel 15.

[0062] According to some embodiments of the present invention, referring to Figures 1-10The top plate 111 has an avoidance groove 1111, which is the first exhaust channel 1112. The avoidance groove 1111 extends to the end of the top plate 111 away from the electrical equipment, so that the first exhaust channel 1112 is connected to the third exhaust channel 15. The top surface of the second end plate 42 abuts against the top plate 111 of the first shell 11. The avoidance groove 1111 is located above the second end plate 42. There is a gap between the top wall of the avoidance groove 1111 and the top surface of the second end plate 42. The high-temperature gas in the first exhaust channel 1112 can be discharged into the third exhaust channel 15 through the gap.

[0063] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The base plate 121 has a through hole 122 connecting the second exhaust channel 22 and the third exhaust channel 15. The through hole 122 is opened on the base plate 121 so that the second exhaust channel 22 and the third exhaust channel 15 are connected. The high-temperature gas in the second exhaust channel 22 can be discharged into the third exhaust channel 15 through the through hole 122.

[0064] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The battery pack 100 also includes a liquid cooling plate 50, which is located in the first accommodating chamber 131. The liquid cooling plate 50 is used to separate the first accommodating chamber 131 into a first sub-chamber and a second sub-chamber. The first battery module 31 is located in the first sub-chamber, and the second battery module 32 is located in the second sub-chamber. The liquid cooling plate 50 is located between the first battery module 31 and the second battery module 32. The temperature sensing collection positions of the first battery module 31 and the second battery module 32 are at the same distance from the liquid cooling plate 50, which is conducive to eliminating the temperature difference collected between the first battery module 31 and the second battery module 32.

[0065] Structural adhesive is applied to the bottom plate 121 of the first shell 11, and the second battery module 32 is placed and glued; buffer foam is filled between the second battery module 32, the second plate 412 and the fourth plate 422; thermal conductive structural adhesive is applied to the upper surface of the second battery module 32, and the liquid cooling plate 50 is placed on the upper surface of the second battery module 32 and glued into the first plate 411 and the third plate 421 on both sides of the first battery module 31, and fixed to the liquid cooling plate 50, the second plate 412 and the fourth plate 422 by bolts, thermal conductive structural adhesive is applied to the upper surface of the liquid cooling plate 50, the first battery module 31 is placed on the upper surface of the liquid cooling plate 50 and glued, glue is applied to part of the upper surface of the first battery module 31, and glue limit strips are set on part of the upper surface of the first battery module 31 to prevent glue from overflowing onto the first explosion-proof valve 311, and then the first shell 11 is installed, glue is pressed at the corresponding position and fixed to the second shell 12 by bolts.

[0066] Throughout this specification, references to terms such as "some embodiments," "optionally," "further," or "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A housing, comprising a first housing and a second housing stacked in a first direction, wherein the first housing and the second housing jointly define a receiving cavity; a first end plate, the first end plate being located in the accommodating cavity and being used to separate the accommodating cavity into a first accommodating cavity and a second accommodating cavity arranged along a second direction, the first accommodating cavity comprising a first sub-cavity and a second sub-cavity stacked along the first direction; a bottom guard plate, the bottom guard plate being located on a side of the second shell facing away from the first shell; a battery module, the battery module being located in the first accommodating cavity, the battery module comprising a first battery module and a second battery module stacked along the first direction, the first battery module being located in the first sub-cavity, the first sub-cavity having a first exhaust passage opposite to a first explosion-proof valve of the first battery module, the second battery module being located in the second sub-cavity, the second housing having an opening opposite to a second explosion-proof valve of the second battery module, and the bottom guard plate having a second exhaust passage opposite to the opening; an electrical device, the electrical device being located in the second accommodating cavity; The first direction is perpendicular to the second direction.

2. The battery pack according to claim 1, wherein: The first explosion-proof valve is located on a side of the first battery module facing away from the second battery module. The first shell has an avoidance groove opposite to the first explosion-proof valve, and the avoidance groove serves as the first exhaust channel.

3. The battery pack according to claim 1, wherein: Also includes: Multiple support members are located between the second shell and the bottom guard plate, the second explosion-proof valve is located on the side of the second battery module away from the first battery module, and the second exhaust channel is provided between two adjacent support members.

4. The battery pack according to claim 2, wherein: Also includes: A second end plate is located on a side of the battery module facing away from the electrical device, the second end plate is abutted against the top plate of the first shell and the bottom plate of the second shell, and a third exhaust channel is provided between the shell and the second end plate and is connected to both the first exhaust channel and the second exhaust channel.

5. The battery pack according to claim 4, characterized in that: The shell includes a side plate opposite to the second end plate, and the first end plate has a first protrusion and a second protrusion on a side facing the side plate. The first protrusion and the second protrusion are both in contact with the side plate to construct the third exhaust channel between the first protrusion and the second protrusion.

6. The battery pack according to claim 5, characterized in that: A buffer is provided between the first protrusion and the second protrusion and the side plate.

7. The battery pack according to claim 5, characterized in that: A main explosion-proof valve is provided on the side plate.

8. The battery pack according to claim 4, characterized in that: The top plate has an escape groove, which is the first exhaust channel. The escape groove extends to an end of the top plate away from the electrical device, so that the first exhaust channel is connected to the third exhaust channel.

9. The battery pack according to claim 4, characterized in that: The bottom plate has a through hole communicating with the first exhaust channel and the second exhaust channel.

10. The battery pack according to claim 1, wherein: Also includes: A liquid cooling plate is located in the first accommodating cavity and is used to separate the first accommodating cavity into the first sub-cavity and the second sub-cavity.

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