Battery pack

Abstract

A battery pack, comprising a case (1), mounting bases (2), explosion-proof structures (3), a venting support (14), and batteries (4). The venting support (14) divides an accommodating space (10) of the case (1) into an accommodating cavity (101) and a venting cavity (102); the mounting bases (2) are arranged at mounting holes (20) on an outer wall of the case (1) and sealedly connected to the case (1); the mounting bases (2) are each provided with a pressure relief channel (200); the explosion-proof structures (3) seal the pressure relief channels (200); the venting support (14) is provided with vent holes (1401); the vent holes (1401) are in communication with the venting cavity (102) and the pressure relief channels (200). Gas generated by thermal runaway of a battery (4) is collected in the venting cavity (102) and enters the pressure relief channels (200), and when the gas pressure in the pressure relief channels (200) reaches a preset value, the explosion-proof structures (3) are opened for the gas to be discharged out of the case (1). The pressure relief channels (200) are formed on the mounting bases (2), and the structural design of the pressure relief channels (200) is not limited by the structure of the case (1), thereby facilitating design and processing of the pressure relief channels (200), ensuring that the pressure relief channels (200) have enough gas release space, and reducing the impact of the pressure relief channels (200) on the strength of the case (1).

Description

A battery pack

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese Patent Application No. 202323481693.4 filed on December 18, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0004] The battery pack includes a box and batteries arranged in the box. In actual applications, the battery will undergo some side reactions under conditions such as short circuit and overcharging, thereby generating a certain amount of gas at a certain temperature. When the generated gas increases to a certain level, it will cause thermal runaway, and then the explosion-proof valve on the battery will explode, and the battery will spray high-temperature gas. This high-temperature gas needs to be discharged from the battery pack to avoid the accumulation of high-temperature gas in the box and causing safety problems.

[0005] Application Contents

[0006] The primary purpose of this application is to propose a battery pack that can discharge the gas generated by thermal runaway of the battery out of the box.

[0007] In order to achieve the above-mentioned purpose, the present application provides a battery pack, including a box body, a mounting seat, an explosion-proof structure, an exhaust bracket and a battery, the box body has a accommodating space, the exhaust bracket is arranged in the accommodating space, the exhaust bracket divides the accommodating space into a accommodating cavity and an exhaust cavity, the battery is arranged in the accommodating cavity, the exhaust cavity is used to collect the gas generated by thermal runaway of the battery, the outer wall of the box body is provided with a mounting hole that passes through the accommodating cavity, the mounting seat is arranged on the mounting hole and is sealed with the box body, the mounting seat has a pressure relief channel, the explosion-proof structure is arranged on the mounting seat and seals one end of the pressure relief channel, and the exhaust bracket is provided with an exhaust hole, which connects the exhaust cavity and the other end of the pressure relief channel.

[0008] In a specific embodiment of the present application, the explosion-proof structure is a bursting disc or an explosion-proof valve.

[0009] In a specific embodiment of the present application, the battery pack has a first orientation;

[0010] The box body includes a bottom plate, a frame, and a cover plate. The frame is connected to the bottom plate and the cover plate on both sides in the first direction. The frame is provided with the mounting hole. The bottom plate, the frame, and the cover plate define the accommodation space.

[0011] The exhaust bracket and the bottom plate are spaced apart in the first direction, the exhaust bracket is connected to the frame, and the exhaust bracket, the frame and the bottom plate enclose to form the exhaust cavity.

[0012] In a specific embodiment of the present application, a plurality of the mounting holes are spaced apart on the frame, the exhaust bracket has a plurality of the exhaust holes spaced apart, and a plurality of the mounting seats are respectively mounted on the plurality of the mounting holes.

[0013] In a specific embodiment of the present application, the battery pack further includes a first connecting plate and a second connecting plate, and the first connecting plate and the second connecting plate are both arranged in the exhaust cavity. In the first direction, the first connecting plate and the exhaust bracket are spaced apart, and the side of the first connecting plate close to the bottom plate is adhered and fixed to the bottom plate, and the second connecting plate is located between the first connecting plate and the exhaust bracket, and the second connecting plate is connected to the first connecting plate and the exhaust bracket at both ends along the first direction.

[0014] In a specific embodiment of the present application, the first connecting plate, the second connecting plate and the exhaust bracket are integrally formed.

[0015] In a specific embodiment of the present application, the pressure relief channel includes an air relief chamber, an air relief hole and a connecting hole. The air relief hole is connected to the exhaust hole and the air relief chamber. The connecting hole is provided on the side of the mounting seat facing away from the accommodating chamber. The connecting hole is connected to the air relief chamber, and the explosion-proof structure seals the connecting hole.

[0016] In a specific embodiment of the present application, the mounting seat has a plurality of spaced-apart connection holes on a side facing away from the accommodating cavity, the plurality of connection holes are all connected to the air leakage cavity, and the plurality of explosion-proof structures seal the plurality of connection holes respectively.

[0017] In a specific embodiment of the present application, the mounting seat includes a seat portion, a connecting portion, and an air release portion, wherein the seat portion is arranged on the mounting hole, the connecting portion is arranged on a side of the seat portion facing the accommodating cavity, the air release portion is located between the seat portion and the connecting portion, and the air release portion connects the seat portion and the connecting portion, the seat portion is provided with the connecting hole, the air release portion has the air release cavity, the connecting portion has a connecting surface facing the bottom plate, and the connecting surface is provided with the air release hole;

[0018] The exhaust hole is provided on the side of the exhaust bracket facing away from the bottom plate, the connecting surface is in contact with the side of the exhaust bracket facing away from the bottom plate, and the exhaust hole is arranged opposite to the air leakage hole.

[0019] In a specific embodiment of the present application, a groove body is provided on the side of the seat portion facing the accommodating cavity, the connecting portion is provided on the bottom surface of the groove body, and the air release portion is provided in the groove body and connected to the connecting portion.

[0020] In a specific embodiment of the present application, the battery pack further has a third direction intersecting with the first direction;

[0021] The frame is provided with a mounting groove on one side facing the bottom plate. Both ends of the mounting groove along the third direction are open ends. The bottom plate covers the notch of the mounting groove, and the bottom plate and the mounting groove define the mounting hole.

[0022] In a specific embodiment of the present application, the mounting seat is tightly fitted into the mounting hole, and the mounting seat is connected to the base plate.

[0023] In a specific embodiment of the present application, the exhaust bracket is disposed on the bottom plate, a side of the exhaust bracket facing away from the bottom plate has a weak area, and the exhaust cavity and the weak area are arranged along the first direction;

[0024] The battery includes a battery housing and an explosion-proof valve provided on the battery housing, the battery is provided on a side of the exhaust bracket facing away from the bottom plate, and the explosion-proof valve is at least partially facing the weak area;

[0025] The exhaust bracket has a plurality of weak areas, the battery is provided in plurality, and the plurality of batteries and the plurality of weak areas are arranged in a one-to-one correspondence.

[0026] In a specific embodiment of the present application, it further includes a reinforcing rib, which is arranged in the exhaust cavity, and both ends of the reinforcing rib along the first direction are connected to the cavity walls of the exhaust cavity at both ends along the first direction.

[0027] In a specific embodiment of the present application, the battery pack further includes a second direction and a third direction, and the first direction, the second direction and the third direction intersect with each other;

[0028] The plurality of weak areas are arranged into a group along the third direction, and the plurality of weak areas are arranged in a plurality of groups along the second direction;

[0029] The reinforcing rib is strip-shaped and extends along the third direction. There are multiple reinforcing ribs, and the multiple reinforcing ribs are arranged at intervals along the second direction. Two adjacent reinforcing ribs and the cavity wall of the exhaust cavity define an exhaust channel, and each exhaust channel is connected to the exhaust hole. The exhaust channel is arranged corresponding to at least one group of the weak areas.

[0030] In a specific embodiment of the present application, the battery pack also has a third direction intersecting with the first direction, and on the cross-section formed by the mounting base in the first direction and the third direction, the cross-sectional area of ​​the exhaust cavity is larger than the cross-sectional area of ​​the air leakage hole; the cross-sectional area of ​​the exhaust cavity is larger than the cross-sectional area of ​​the connecting hole.

[0031] In a specific embodiment of the present application, the dimension of the connecting portion in the first direction is D mm, satisfying: 2≤D≤20.

[0032] Compared with the prior art, the battery pack of the present application has the following advantages:

[0033] In the battery pack of the present application, the exhaust chamber is connected to the pressure relief channel through the exhaust hole. The gas generated by thermal runaway of the battery is collected by the exhaust chamber and enters the pressure relief channel. When the air pressure in the pressure relief channel reaches a preset value, the explosion-proof structure opens to allow the gas to be discharged outside the box, which can avoid the accumulation of high-temperature gas in the box and cause safety problems. In addition, the pressure relief channel is arranged on the mounting seat, and the structural design of the pressure relief channel is not restricted by the box structure, which is conducive to the design and processing of the pressure relief channel, ensuring that the pressure relief channel has sufficient space for discharge while reducing the impact of the pressure relief channel on the strength of the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a structural diagram of a battery pack according to an embodiment of the present application;

[0035] FIG2 is an exploded schematic diagram of a battery pack according to an embodiment of the present application;

[0036] FIG3 is a structural diagram of a mounting base according to an embodiment of the present application;

[0037] FIG4 is a structural diagram of the mounting base according to another embodiment of the present application from another angle;

[0038] FIG5 is a schematic cross-sectional view of a mounting base according to an embodiment of the present application;

[0039] FIG6 is a schematic cross-sectional view of a battery according to an embodiment of the present application;

[0040] FIG7 is a structural diagram of the battery and the exhaust bracket according to an embodiment of the present application;

[0041] FIG8 is a schematic cross-sectional view of a battery pack according to an embodiment of the present application;

[0042] FIG9 is another schematic cross-sectional view of the battery pack according to the embodiment of the present application.

[0043] In the figure, 1. box body; 10. accommodating space; 101. accommodating cavity; 20. mounting hole; 11. bottom plate; 12. frame; 121. mounting groove; 13. cover plate; 14. exhaust bracket; 102. exhaust cavity; 1021. exhaust channel; 1401. exhaust hole; 1402. weak area; 15. first connecting plate; 16. second connecting plate; 2. mounting seat; 200. pressure relief channel; 201. air relief cavity; 202. air relief hole; 203. connecting hole; 21. seat; 211. groove body; 22. connecting part; 221. connecting surface; 23. air relief part; 3. explosion-proof structure; 4. battery; 41. battery shell; 42. explosion-proof valve; 5. reinforcing rib; Z, first direction; Y, second direction; X, third direction. DETAILED DESCRIPTION

[0044] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0046] In the description of this application, 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; they can refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they 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 application based on specific circumstances.

[0047] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the examples, "parallel" refers to the state where the angle formed between two lines, between a line and a plane, or between two planes is between -1° and 1°. Furthermore, "perpendicular" refers to the state where the angle formed between two lines, between a line and a plane, or between two planes is between 89° and 91°. Equal distances, equal angles, or equal areas refer to the state where the tolerance range is between -1% and 1%.

[0049] As shown in Figures 1 to 9, a battery pack according to a preferred embodiment of the present application has a first direction Z, a second direction Y, and a third direction X that are perpendicular to each other. The first direction Z can be the height direction of the battery pack, the second direction Y can be the length direction of the battery pack, and the third direction X can be the width direction of the battery pack. Among them, the battery pack includes a box body 1, a mounting base 2, an explosion-proof structure 3, an exhaust bracket 14 and a battery 4. The box body 1 has a accommodating space 10, and the exhaust bracket 14 is arranged in the accommodating space 10. The exhaust bracket 14 divides the accommodating space 10 into an accommodating cavity 101 and an exhaust cavity 102; the battery 4 is arranged in the accommodating cavity 101, and the exhaust cavity 102 is used to collect the gas generated by thermal runaway of the battery 4. The outer wall of the box body 1 is provided with a mounting hole 20 that passes through the accommodating cavity 101, the mounting base 2 is arranged on the mounting hole 20 and is sealed with the box body 1, the mounting base 2 has a pressure relief channel 200, the explosion-proof structure 3 is arranged on the mounting base 2 and seals one end of the pressure relief channel 200, and the exhaust bracket 14 is provided with an exhaust hole 1401, which connects the exhaust cavity 102 and the other end of the pressure relief channel 200.

[0050] In actual application, the gas generated by thermal runaway of the battery 4 is collected by the exhaust chamber 102 and enters the pressure relief channel 200. When the air pressure in the pressure relief channel 200 reaches a preset value, the explosion-proof structure 3 opens to allow the gas to be discharged to the outside of the box body 1, which can avoid the accumulation of high-temperature gas in the box body 1 and cause safety problems; in addition, the pressure relief channel 200 is arranged on the mounting seat 2, and the structural design of the pressure relief channel 200 is not restricted by the structure of the box body 1, which is conducive to the design and processing of the pressure relief channel 200, ensuring that the pressure relief channel 200 has sufficient air release space while reducing the impact of the pressure relief channel 200 on the strength of the box body 1.

[0051] As shown in FIG2 , the box body 1 includes a bottom plate 11, a frame 12, and a cover plate 13. The frame 12 is connected to the bottom plate 11 and the cover plate 13 on both sides in the first direction Z. The bottom plate 11, the frame 12, and the cover plate 13 define a storage space 10. An exhaust bracket 14 is disposed within the storage space 10. The exhaust bracket 14 and the bottom plate 11 are spaced apart and connected to the frame 12. The exhaust bracket 14, the bottom plate 11, and the frame 12 together form an exhaust cavity 102. The frame 12 is provided with a mounting hole 20, the exhaust bracket 14 has an exhaust hole 1401, and the battery 4 is disposed on the exhaust bracket 14. Specifically, the battery pack is composed of the bottom plate 11, the frame 12, the cover plate 13, the exhaust bracket 14, and the battery 4. It has a simple structure and is easy to assemble. The exhaust hole 1401 is provided on the exhaust bracket 14, which facilitates the design and processing of the exhaust cavity 102 and the exhaust hole 1401.

[0052] In some embodiments, as shown in Figure 2, a plurality of mounting holes 20 are spaced apart on the frame 12, the exhaust bracket 14 has a plurality of exhaust holes 1401 spaced apart, and a plurality of mounting seats 2 are respectively installed on the plurality of mounting holes 20. By providing a plurality of exhaust holes 1401 and a plurality of mounting seats 2 connected to the plurality of exhaust holes 1401, the gas in the exhaust cavity 102 is facilitated to be discharged faster.

[0053] In some embodiments, as shown in Figure 8, the battery pack also includes a first connecting plate 15 and a second connecting plate 16, and the first connecting plate 15 and the second connecting plate 16 are both arranged in the exhaust cavity 102. In the first direction Z, the first connecting plate 15 and the exhaust bracket 14 are spaced apart, and the side of the first connecting plate 15 close to the bottom plate 11 is fitted and fixed to the bottom plate 11. The second connecting plate 16 is located between the first connecting plate 15 and the exhaust bracket 14, and the second connecting plate 16 is respectively connected to the first connecting plate 15 and the exhaust bracket 14 at both ends along the first direction Z. The subspace enclosed by the first connecting plate 15 and the exhaust bracket 14 can be used as an exhaust cavity. In some embodiments, the first connecting plate 15 and the second connecting plate 16 can be integrally formed with the exhaust bracket 14. The exhaust bracket 14 can be fixed by fitting the side of the first connecting plate 15 close to the bottom plate 11 to the bottom plate 11, which is convenient for design and processing.

[0054] As shown in FIG5 , the pressure relief channel 200 includes a vent chamber 201, a vent hole 202, and a connection hole 203. The vent hole 202 communicates with the exhaust hole 1401 and the vent chamber 201. The mounting base 2 is provided with a connection hole 203 on the side facing away from the accommodating chamber 101. The connection hole 203 communicates with the vent chamber 201. The explosion-proof structure 3 seals the connection hole 203. That is, the explosion-proof structure 3 is provided on the side of the mounting base 2 facing away from the accommodating chamber 101, making the installation of the explosion-proof structure 3 convenient. Specifically, the explosion-proof structure 3 can be a bursting disc, an explosion-proof valve, etc., which is not limited in this application. As a specific implementation of this embodiment, the explosion-proof structure 3 is an explosion-proof valve 42, which is connected to the mounting base 2 by screws and seals the connection hole 203.

[0055] In some embodiments, the side of the mounting base 2 facing away from the accommodating cavity 101 has a plurality of connection holes 203 arranged at intervals, and the plurality of connection holes are all connected to the air leakage cavity 201. The plurality of explosion-proof structures 3 respectively seal the plurality of connection holes 203. By providing the plurality of connection holes 203 and the plurality of explosion-proof structures 3, the gas in the exhaust cavity 102 is facilitated to be discharged from the battery pack faster.

[0056] As shown in Figures 2 to 5, the mounting seat 2 includes a seat portion 21, a connecting portion 22 and an air release portion 23. The seat portion 21 is arranged on the mounting hole 20, and the connecting portion 22 is arranged on the side of the seat portion 21 facing the accommodating cavity 101. The air release portion 23 is located between the seat portion 21 and the connecting portion 22, and the air release portion 23 connects the seat portion 21 and the connecting portion 22. The seat portion 21 is provided with a connecting hole 203, the air release portion 23 has an air release cavity 201, and the connecting portion 22 has a connecting surface 221 facing the bottom plate 11, and the connecting surface 221 is provided with an air release hole 202; the side of the exhaust bracket 14 facing away from the bottom plate 11 contacts the connecting surface 221. At this time, the mounting seat 2 cooperates with the bottom plate 11 to limit the position of the exhaust bracket 14 in the first direction Z, so that the exhaust bracket 14 is more stably arranged on the bottom plate 11; and the exhaust hole 1401 is arranged opposite to the air release hole 202, so that the exhaust cavity 102 and the air release cavity 201 are connected.

[0057] As shown in FIG9 , in the cross-section formed in the first direction Z and the third direction X of the mounting base 2, the cross-sectional area of ​​the exhaust cavity 102 is larger than the cross-sectional area of ​​the bleed hole 202 , and the cross-sectional area of ​​the exhaust cavity 102 is larger than the cross-sectional area of ​​the connection hole 203 . Through such a design, the gas can be buffered in the exhaust cavity 102 to avoid excessive gas pressure when the gas is discharged from the box body, thereby improving the safety performance of the battery pack.

[0058] In some embodiments, as shown in FIG5 , the dimension of the connecting portion 22 in the first direction Z is the thickness D mm of the connecting portion 22 , 2≤D≤20, and D can be specifically set to 2 mm, 5 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 20 mm, etc. Setting the thickness of the connecting portion 22 within this range can not only ensure the strength of the connecting portion, but also avoid the connection portion 22 being too thick and interfering with other components inside the battery pack. Specifically, the thickness of the connecting portion can be measured with a vernier caliper or a micrometer, and multiple measurements can be made to obtain an average value.

[0059] As shown in Figures 4 and 5 , a groove 211 is provided on the side of the seat 21 facing the accommodating cavity 101. The connecting portion 22 is provided on the bottom surface of the groove 211. The air release portion 23 is provided in the groove 211 and connected to the connecting portion 22. Specifically, the provision of the groove 211 serves to reduce the weight of the seat 21, thereby achieving a lightweight design of the mounting base 2.

[0060] As shown in Figures 2 and 9, a mounting groove 121 is provided on the side of the frame 12 facing the base plate 11. Both ends of the mounting groove 121 along the third direction X are open. The base plate 11 covers the notch of the mounting groove 121, and the base plate 11 and the mounting groove 121 define a mounting hole 20. This structure defines the mounting hole 20. When processing the mounting groove 121, the side of the frame 12 close to the base plate 11 can be used as the processing reference side. The mounting groove 121 is easy to process, which is conducive to the formation of the mounting hole 20. Specifically, the shape of the mounting hole 20 is adapted to the shape of the mounting seat 2. The mounting seat 2 is tightly fitted in the mounting hole 20, and the mounting seat 2 is connected to the base plate 11. In actual application, the mounting seat 2 is first connected to the base plate 11, and then the mounting groove 121 of the frame 12 is aligned with the mounting seat 2. Finally, the frame 12 is connected to the base plate 11. Based on this, the mounting seat 2 is set on the mounting hole 20. Specifically, as shown in FIG9 , the bottom wall of the mounting base 2 has a threaded hole, and the bottom plate 11 has a connecting hole coaxially arranged with the threaded hole. The mounting base 2 is connected to the bottom plate 11 by screws passing through the connecting hole and mating with the threaded hole, which provides a highly stable connection. The side walls and top wall of the mounting base 2 are welded to the groove walls of the mounting groove 121. Furthermore, a seal is provided between the bottom wall of the mounting base 2 and the bottom plate 11 to ensure a sealed connection between the mounting base 2 and the bottom plate 11. The seal may be a sealing adhesive layer, a rubber pad, etc., which is not limited in this application.

[0061] As shown in Figure 2, the exhaust bracket 14 has a weak area 1402 on the side facing away from the base plate 11, and the exhaust cavity 102 and the weak area 1402 are arranged along the first direction Z; as shown in Figures 6, 7 and 8, the battery 4 includes a battery shell 41, which is a component for accommodating the electrode assembly. The battery shell 41 can be made of aluminum, aluminum alloy steel or other materials; the battery shell 41 can be a rectangular parallelepiped, a cylinder or other shapes. An explosion-proof valve 42 is provided on the battery housing 41. The battery 4 is provided on the side of the exhaust bracket 14 facing away from the base plate 11, and the explosion-proof valve 42 is at least partially oriented toward the weak area 1402. The exhaust bracket 14 has multiple weak areas 1402, and the battery 4 is provided with multiple weak areas 1402. Multiple batteries 4 and multiple weak areas 1402 are provided in a one-to-one correspondence. Based on this, the gas generated by thermal runaway of a single battery 4 will break through the corresponding weak area 1402 and enter the exhaust cavity 102 in a timely manner, and then be discharged through the explosion-proof structure 3. That is, the gas generated by thermal runaway of a single battery 4 will not interfere with other batteries 4, thus avoiding causing thermal runaway of other batteries 4 and preventing safety issues. The weak area 1402 can be a thinned portion of the exhaust bracket 14 or a notch provided on the exhaust bracket 14, and this application does not impose any restrictions on this.

[0062] In other embodiments, the exhaust bracket 14 is not provided with the above-mentioned weak area 1402, but is provided with an air inlet hole, which collects the gas generated by the thermal runaway of the battery 4 through the air inlet hole. Based on this, the battery pack can also discharge the gas generated by the thermal runaway of the battery 4 to the outside of the box 1.

[0063] In this embodiment, as shown in Figure 8 , the battery pack further includes a reinforcing rib 5 disposed within the exhaust cavity 102. The two ends of the reinforcing rib 5 along the first direction Z are respectively connected to the cavity walls of the exhaust cavity 102 at both ends along the first direction Z. In this case, one end of the reinforcing rib 5 is connected to the exhaust bracket 14, and the other end is connected to the first connecting plate 15. In actual use, the battery pack is placed along the first direction Z, and the battery 4 is mounted on the exhaust bracket 14. The provision of the reinforcing rib 5 ensures that the exhaust bracket 14 has sufficient strength to support the battery 4.

[0064] Furthermore, multiple weak areas 1402 are arranged in a group along the third direction X, and multiple groups of weak areas 1402 are arranged along the second direction Y. The reinforcing ribs 5 are strip-shaped and extend along the third direction X. Multiple reinforcing ribs 5 are provided, and the multiple reinforcing ribs 5 are spaced apart along the second direction Y. Two adjacent reinforcing ribs 5 and the cavity wall of the exhaust cavity 102 define exhaust channels 1021. Each exhaust channel 1021 is connected to the exhaust hole 1401, and the exhaust channel 1021 is corresponding to at least one group of weak areas 1402. For example, as shown in FIG8, a single exhaust channel 1021 is corresponding to a group of weak areas 1402. When the battery 4 experiences thermal runaway, the gas generated by the battery breaks through the corresponding weak area 1402 and enters the corresponding exhaust channel 1021. Then, it enters the pressure relief channel 200 through the exhaust hole 1401 and is finally discharged through the explosion-proof structure 3. Specifically, the reinforcing ribs 5 divide the larger exhaust cavity 102 into a plurality of smaller exhaust channels 1021 . When the gas flows in the smaller exhaust channels 1021 , the gas flow rate loss is relatively small, which is conducive to timely discharge of the gas.

[0065] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present application. These improvements and replacements should also be regarded as the scope of protection of the present application.

Claims

1. A battery pack, wherein: The battery pack comprises a box (1), a mounting seat (2), an explosion-proof structure (3), an exhaust bracket (14) and a battery (4); the box (1) has a accommodating space (10); the exhaust bracket (14) is arranged in the accommodating space (10); the exhaust bracket (14) divides the accommodating space (10) into an accommodating cavity (101) and an exhaust cavity (102); the battery (4) is arranged in the accommodating cavity (101); the exhaust cavity (102) is used to collect gas generated by thermal runaway of the battery (4); The outer wall of the box body (1) is provided with a penetrating mounting hole (20); the mounting seat (2) is arranged on the mounting hole (20) and is sealed with the box body (1); the mounting seat (2) has a pressure relief channel (200); the explosion-proof structure (3) is arranged on the mounting seat (2) and seals one end of the pressure relief channel (200); the exhaust bracket (14) is provided with an exhaust hole (1401); the exhaust hole (1401) is connected with the exhaust cavity (102) and the other end of the pressure relief channel (200).

2. The battery pack according to claim 1, wherein: The explosion-proof structure (3) is a bursting disc or an explosion-proof valve.

3. The battery pack according to claim 1, wherein: The battery pack has a first direction (Z); The box body (1) comprises a bottom plate (11), a frame (12), and a cover plate (13); the frame (12) is connected to the bottom plate (11) and the cover plate (13) at two sides in the first direction (Z), respectively; the frame (12) is provided with the mounting hole (20); the bottom plate (11), the frame (12), and the cover plate (13) define the accommodating space (10); The exhaust bracket (14) and the bottom plate (11) are arranged at intervals in the first direction (Z); the exhaust bracket (14) is connected to the frame (12); and the exhaust bracket (14), the frame (12) and the bottom plate (11) enclose the exhaust cavity (102).

4. The battery pack according to claim 3, wherein: The frame (12) is provided with a plurality of mounting holes (20) at intervals, the exhaust bracket (14) has a plurality of exhaust holes (1401) at intervals, and the plurality of mounting seats (2) are respectively mounted on the plurality of mounting holes (20).

5. The battery pack according to claim 3, wherein: The battery pack further comprises a first connecting plate (15) and a second connecting plate (16), wherein the first connecting plate (15) and the second connecting plate (16) are both arranged in the exhaust cavity (102), and in the first direction (Z), the first connecting plate (15) and the exhaust bracket (14) are arranged at intervals, and a side of the first connecting plate (15) close to the bottom plate (11) is fitted and fixed to the bottom plate (11), and the second connecting plate (16) is located between the first connecting plate (15) and the exhaust bracket (14), and the second connecting plate (16) is respectively connected to the first connecting plate (15) and the exhaust bracket (14) at both ends along the first direction (Z).

6. The battery pack according to claim 5, wherein: The first connecting plate (15), the second connecting plate (16) and the exhaust bracket (14) are integrally formed.

7. The battery pack according to claim 3, wherein: The pressure relief channel (200) comprises an air relief chamber (201), an air relief hole (202) and a connecting hole (203); the air relief hole (202) is connected to the exhaust hole (1401) and the air relief chamber (201); the connecting hole (203) is provided on a side of the mounting seat (2) facing away from the accommodating chamber (101); the connecting hole (203) is connected to the air relief chamber (201); and the explosion-proof structure (3) seals the connecting hole (203).

8. The battery pack according to claim 7, wherein: The side of the mounting seat (2) facing away from the accommodating cavity (101) has a plurality of connection holes (203) arranged at intervals, the plurality of connection holes (203) are all connected to the air leakage cavity (201), and the plurality of explosion-proof structures (3) respectively seal the plurality of connection holes (203).

9. The battery pack according to claim 7, wherein: The mounting seat (2) comprises a seat portion (21), a connecting portion (22) and an air leakage portion (23); the seat portion (21) is arranged on the mounting hole (20); the connecting portion (22) is arranged on a side of the seat portion (21) facing the accommodating cavity (101); the air leakage portion (23) is located between the seat portion (21) and the connecting portion (22); and the air leakage portion (23) connects the seat portion (21) and the connecting portion (22); the seat portion (21) is provided with the connecting hole (203); the air leakage portion (23) has the air leakage cavity (201); the connecting portion (22) has a connecting surface (221) facing the bottom plate (11); and the connecting surface (221) is provided with the air leakage hole (202); The exhaust hole (1401) is arranged on the side of the exhaust bracket (14) facing away from the bottom plate (11), the connecting surface (221) is in contact with the side of the exhaust bracket (14) facing away from the bottom plate (11), and the exhaust hole (1401) is arranged opposite to the air leakage hole (202).

10. The battery pack according to claim 9, wherein: A groove body (211) is provided on one side of the seat portion (21) facing the accommodating cavity (101); the connecting portion (22) is arranged on the groove bottom surface of the groove body (211); and the air release portion (23) is arranged in the groove body (211) and connected to the connecting portion (22).

11. The battery pack according to claim 3, wherein: The battery pack also has a third direction (X) intersecting with the first direction (Z); A mounting groove (121) is provided on one side of the frame (12) facing the bottom plate (11); both ends of the mounting groove (121) along the third direction (X) are open ends; the bottom plate (11) covers the notch of the mounting groove (121); and the bottom plate (11) and the mounting groove (121) define the mounting hole (20).

12. The battery pack according to claim 11, wherein: The mounting seat (2) is tightly fitted into the mounting hole (20), and the mounting seat (2) is connected to the base plate (11).

13. The battery pack according to claim 3, wherein: The exhaust support (14) has a weak area (1402), and the exhaust cavity (102) and the weak area (1402) are arranged along the first direction (Z); The battery (4) comprises a battery housing (41) and an explosion-proof valve (42) arranged on the battery housing (41); the battery (4) is arranged on a side of the exhaust bracket (14) facing away from the bottom plate (11); and the explosion-proof valve (42) is at least partially oriented toward the weak area (1402); The exhaust bracket (14) has a plurality of weak areas (1402), the battery (4) is provided with a plurality of them, and the plurality of batteries (4) and the plurality of weak areas (1402) are arranged in a one-to-one correspondence.

14. The battery pack according to claim 13, wherein: It also includes a reinforcing rib (5), which is arranged in the exhaust cavity (102), and the two ends of the reinforcing rib (5) along the first direction (Z) are respectively connected to the cavity walls of the exhaust cavity (102) at the two ends along the first direction (Z).

15. The battery pack according to claim 14, wherein: The battery pack further includes a second direction (Y) and a third direction (X), and the first direction (Z), the second direction (Y) and the third direction (X) intersect each other; A plurality of the weak areas (1402) are arranged in a group along the third direction (X), and a plurality of groups of the weak areas (1402) are arranged along the second direction (Y); The reinforcing rib (5) is strip-shaped and extends along the third direction (X). A plurality of the reinforcing ribs (5) are provided, and the plurality of the reinforcing ribs (5) are arranged at intervals along the second direction (Y). Two adjacent reinforcing ribs (5) and the cavity wall of the exhaust cavity (102) define an exhaust channel (1021), and each of the exhaust channels (1021) is connected to the exhaust hole (1401). The exhaust channel (1021) is arranged corresponding to at least one group of the weak areas (1402).

16. The battery pack according to claim 9, wherein: The battery pack also has a third direction (X) intersecting with the first direction (Z); in a cross section of the mounting seat (2) formed in the first direction (Z) and the third direction (X), the cross-sectional area of ​​the exhaust cavity (102) is greater than the cross-sectional area of ​​the air leakage hole (202); and the cross-sectional area of ​​the exhaust cavity (102) is greater than the cross-sectional area of ​​the connection hole (203).

17. The battery pack according to claim 9, wherein: The dimension of the connecting portion (22) in the first direction (Z) is D mm, satisfying: 2≤D≤20.

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