Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a battery box, the battery box is provided with a first mounting cavity and a pressure discharge channel, the pressure discharge channel is constructed to be capable of being communicated with the outside of the battery box, at least one side wall of the battery box is provided with a plurality of first air guide ports, and the plurality of first air guide ports are communicated with the pressure discharge channel; the battery module is mounted in the first mounting cavity, the battery module comprises a plurality of battery cells which are sequentially arranged, a battery cell explosion-proof valve is arranged on the side surface of each battery cell, and the plurality of first air guide ports and the plurality of battery cell explosion-proof valves are arranged in a one-to-one correspondence manner. The battery pack provided by the technical scheme of the utility model can effectively reduce the risk of heat diffusion.

Description

Technical Field

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

[0002] At present, the new energy industry is developing rapidly. As the core of electric vehicle development, the safety of power battery packs has received extensive attention. The battery packs of the existing technology do not have special flow channel designs and exhaust channel designs for the high-temperature and high-pressure gas mixture ejected after the battery cell thermal runaway. The ejected gas after the battery cell thermal runaway may act on the surrounding modules, resulting in heat diffusion. Utility Model Content

[0003] The main purpose of the present invention is to provide a battery pack, which can effectively reduce the risk of heat diffusion.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery pack is provided, including: a battery box, having a first installation cavity and a pressure relief channel, the pressure relief channel is constructed to be able to communicate with the outside of the battery box, and a plurality of first air guide ports are arranged on at least one side wall of the battery box, and the plurality of first air guide ports are all connected with the pressure relief channel; a battery module, installed in the first installation cavity, the battery module includes a plurality of battery cells arranged in sequence, a battery cell explosion-proof valve is arranged on the side of each battery cell, and the plurality of first air guide ports are arranged in one-to-one correspondence with the plurality of battery cell explosion-proof valves.

[0005] Furthermore, the pressure relief channel includes a first pressure relief branch channel, and two opposite side walls of the battery box have a first pressure relief branch channel and a plurality of first air guide ports connected to the first pressure relief branch channel, and the first pressure relief branch channel is constructed to be able to communicate with the outside of the battery box.

[0006] Furthermore, the pressure relief channel includes a first pressure relief branch channel and a second pressure relief branch channel, the second pressure relief branch channel is constructed to be able to communicate with the outside of the battery box, and the two opposite side walls of the battery box have a first pressure relief branch channel and a plurality of first air guide ports connected to the first pressure relief branch channel, and the first pressure relief branch channel is connected to the second pressure relief branch channel.

[0007] Furthermore, the battery pack also includes a plurality of first adjusting members, which are arranged in one-to-one correspondence with the plurality of first air ports, and the first adjusting members are installed at the first air ports. The first adjusting members have an open state in which the first air ports are connected to the first pressure relief branch channel and a closed state in which the first air ports are disconnected from the first pressure relief branch channel. When the battery cell has thermal runaway, the first adjusting member corresponding to the first adjusting member is in an open state.

[0008] Furthermore, the first adjusting member further comprises a bracket, on which a plurality of through holes 61 are arranged at intervals, and the plurality of through holes 61 are arranged in one-to-one correspondence with the plurality of first air guide ports.

[0009] Furthermore, the battery pack also includes an air guide structure, which is installed in the first installation cavity. The air guide structure includes a third pressure relief branch channel and a plurality of second air guide ports connected to the third pressure relief branch channel. The third pressure relief branch channel is connected to the second pressure relief branch channel, and a plurality of battery cell explosion-proof valves of the battery module adjacent to the air guide structure are arranged one-to-one correspondingly to the plurality of second air guide ports.

[0010] Furthermore, the battery pack also includes multiple second adjusting members and multiple third adjusting members, and the multiple second adjusting members and the multiple third adjusting members are all installed in the third pressure relief branch channel. The second air port has a first side and a second side that are relatively set. The multiple second adjusting members are arranged in a one-to-one correspondence with the multiple second air ports, and the multiple second adjusting members are located on the first side of the second air ports. The multiple third adjusting members are arranged in a one-to-one correspondence with the multiple second air ports, and the multiple third adjusting members are located on the second side of the second air ports. The second adjusting members and the third adjusting members both have an open state that connects the second air ports with the third pressure relief branch channel and a closed state that disconnects the second air ports from the third pressure relief branch channel. When the battery cell is thermally runaway, the second adjusting member or the third adjusting member corresponding to it is in an open state.

[0011] Furthermore, there are multiple battery modules and multiple air guide structures, and the multiple air guide structures are arranged in the first installation cavity at intervals along the first direction, and a battery module is arranged between two adjacent air guide structures.

[0012] Furthermore, the battery box also has a second installation cavity, the first installation cavity and the second installation cavity are arranged independently of each other, and the second installation cavity is configured to be used for installing high-voltage components.

[0013] Furthermore, the battery pack also includes a first end plate and a second end plate, which are arranged in the battery box at intervals along the second direction to form a first installation cavity and a second installation cavity, and the second end plate and the side wall of the battery box together form a second pressure discharge branch channel.

[0014] By applying the technical solution of the utility model, a battery box and a battery module are provided, and a plurality of first air guide ports are provided on at least one side wall of the battery box. The plurality of first air guide ports are arranged in one-to-one correspondence with the plurality of battery cell explosion-proof valves. When a battery cell in the battery module suffers from thermal runaway, the ejecta generated by the battery cell first breaks through the battery cell explosion-proof valve, and then enters the pressure relief channel through the first air guide ports in sequence, and is then discharged to the outside of the battery box through the pressure relief channel, thereby preventing the ejecta generated by the thermal runaway battery cell from acting on the surrounding battery cells, causing the temperature of the surrounding battery cells to increase, thereby reducing the risk of heat diffusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0016] In the figure:

[0017] Figure 1 An exploded view of a battery pack according to an embodiment of the present utility model is shown;

[0018] Figure 2 A partial structural schematic diagram of a battery pack according to an embodiment of the utility model is shown;

[0019] Figure 3 A partial structural schematic diagram of a battery pack according to an embodiment of the utility model is shown;

[0020] Figure 4 A partial structural schematic diagram of a battery pack according to an embodiment of the utility model is shown;

[0021] Figure 5 A partial structural schematic diagram of a battery pack according to an embodiment of the utility model is shown; and

[0022] Figure 6 A partial structural schematic diagram of a battery pack according to an embodiment of the utility model is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Battery box; 101. First side panel; 102. Second side panel; 103. Third side panel; 104. Fourth side panel; 11. First installation cavity; 12. Second pressure discharge branch channel; 13. First air guide port; 14. Second installation cavity; 15. Bottom plate; 16. First pressure discharge branch channel; 20. Battery module; 21. Battery cell; 211. Battery cell explosion-proof valve; 30. First adjustment member; 40. Air guide structure; 41. Second air guide port; 50. Second adjustment member; 60. Bracket; 61. Through hole; 70. First end plate; 80. Second end plate; 90. Cover plate; 100. Control valve; 200. High-voltage components. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] See also Figures 1 to 6As shown, the utility model provides a battery pack, which includes: a battery box 10, having a first installation cavity 11 and a pressure relief channel, the pressure relief channel is constructed to be able to communicate with the outside of the battery box 10, and a plurality of first air guide ports 13 are arranged on at least one side wall of the battery box 10, and the plurality of first air guide ports 13 are all connected to the pressure relief channel; a battery module 20, installed in the first installation cavity 11, the battery module 20 includes a plurality of battery cells 21 arranged in sequence, and a battery cell explosion-proof valve 211 is arranged on the side of each battery cell 21, and the plurality of first air guide ports 13 are arranged one by one with the plurality of battery cell explosion-proof valves 211.

[0027] In this embodiment, the battery module 20 includes a plurality of battery cells 21 arranged along the second direction, each battery cell 21 is provided with a battery cell explosion-proof valve 211, and a plurality of first air guide ports 13 are provided on at least one side wall of the battery box 10, and the plurality of first air guide ports 13 are arranged one-to-one with the plurality of battery cell explosion-proof valves 211. When a battery cell 21 in the battery module 20 has thermal runaway, the ejecta generated by the battery cell 21 first breaks through the battery cell explosion-proof valve 211, and then sequentially passes through the first air guide ports 13 into the pressure relief channel. Since the pressure relief channel is connected to the outside of the battery box 10, the ejecta generated by the thermal runaway of the battery cell 21 (i.e., a high-temperature and high-pressure gas mixture) can be discharged to the outside of the battery box 10 through the pressure relief channel. Through the above arrangement, the ejecta of the thermal runaway battery cell 21 can be discharged in a directional manner, and the ejecta generated by the thermal runaway battery cell 21 can be prevented from acting on the surrounding battery cells 21 to cause the temperature of the surrounding battery cells 21 to rise, thereby reducing the risk of thermal diffusion.

[0028] In one embodiment, the battery box 10 includes a first side plate 101, a second side plate 102, a third side plate 103, a fourth side plate 104 and a bottom plate 15, wherein the first side plate 101, the second side plate 102, the third side plate 103, and the fourth side plate 104 are sequentially connected as a whole and then installed on the bottom plate 15, wherein the first side plate 101 and the third side plate 103 are arranged opposite to each other, and the second side plate 102 and the fourth side plate 104 are arranged opposite to each other, the first side plate 101 and the third side plate 103 both include a cavity and a plurality of first air guide ports 13 connected to the cavity, the second side plate 102 also includes a cavity, the cavities of the first side plate 101 and the third side plate 103 are both connected to the cavity of the second side plate 102, and a control valve 100 is provided on the second side plate 102 to control the connection state between the cavity of the second side plate 102 and the outside of the battery box 10, and the cavity of the second side plate 102 serves as a pressure discharge channel.

[0029] When the number of battery modules 20 is one, the multiple battery cell explosion-proof valves 211 of the battery module 20 can be set in a one-to-one correspondence with the multiple first air ports 13 on the first side plate 101, or can be set in a one-to-one correspondence with the multiple first air ports 13 on the third side plate 103. When thermal runaway occurs in the battery cell 21, the ejecta generated by the battery cell 21 can enter the cavity of the first side plate 101 or the third side plate 103 through the first air ports 13, and then flow into the cavity of the second side plate 102. The explosion-proof valve on the second side plate 102 opens to discharge the ejecta from the cavity of the second side plate 102 to the outside of the battery box 10. When there are multiple battery modules 20, the multiple battery cell explosion-proof valves 211 of the battery module 20 adjacent to the first side plate 101 are arranged in a one-to-one correspondence with the multiple first air guide ports 13 on the first side plate 101. When the battery cell 21 has thermal runaway, the ejecta generated by the battery cell 21 can enter the cavity of the first side plate 101 through the first air guide port 13, and then flow into the cavity of the second side plate 102, and be discharged from the cavity of the second side plate 102 to the outside of the battery box 10; the multiple battery cell explosion-proof valves 211 of the battery module 20 adjacent to the third side plate 103 are arranged in a one-to-one correspondence with the multiple first air guide ports 13 on the third side plate 103. When the battery cell 21 has thermal runaway, the ejecta generated by the battery cell 21 can enter the cavity of the third side plate 103 through the first air guide port 13, and then flow into the cavity of the second side plate 102, and then be discharged from the cavity of the second side plate 102 to the outside of the battery box 10. In addition, the exhaust channel is arranged on the side wall of the battery box 10, and no additional arrangement is required, which can reduce the overall size of the battery pack and improve the volume grouping rate of the battery pack. At the same time, the first side plate 101, the second side plate 102 and the third side plate 103 are all provided with cavities, which can reduce the overall weight of the battery box 10, thereby improving the energy density of the battery pack.

[0030] It should be noted that the number of the control valves 100 can be set according to actual needs, and the control valve 100 is an explosion-proof valve or a pressure relief valve.

[0031] See also Figures 1 to 6 As shown, in one embodiment of the utility model, the pressure relief channel includes a first pressure relief branch channel 16, and two opposite side walls of the battery box 10 have the first pressure relief branch channel 16 and a plurality of first air guide ports 13 connected to the first pressure relief branch channel 16, and the first pressure relief branch channel 16 is constructed to be able to communicate with the outside of the battery box 10.

[0032] In this embodiment, the first pressure-discharging branch channel 16 is arranged on the side wall of the battery box 10, the first air guide port 13 is connected to the first pressure-discharging branch channel 16, and the first pressure-discharging branch channel 16 is connected to the outside of the battery box 10. When the battery cell 21 has thermal runaway, the ejecta generated by the battery cell 21 enters the first pressure-discharging branch channel 16 through the first air guide port 13, and then is discharged to the outside of the battery box 10 through the first pressure-discharging branch channel 16. Through the above arrangement, the directional air guidance and exhaust of the ejecta of the battery cell 21 (the ejecta refers to the high-temperature and high-pressure gas generated by the thermal runaway of the battery cell 21) can be achieved, and the ejecta generated by the thermal runaway battery cell 21 is prevented from acting on the surrounding battery cells 21, thereby reducing the risk of thermal diffusion. At the same time, through the above arrangement, the types and quantities of thermal diffusion protective parts of the battery pack can be reduced, thereby reducing the production cost.

[0033] See also Figures 1 to 6 As shown, in one embodiment of the utility model, the pressure exhaust channel includes a first pressure exhaust branch channel 16 and a second pressure exhaust branch channel 12. The second pressure exhaust branch channel 12 is constructed to be able to communicate with the outside of the battery box 10. The two opposite side walls of the battery box 10 have a first pressure exhaust branch channel 16 and a plurality of first air guide ports 13 connected to the first pressure exhaust branch channel 16. The first pressure exhaust branch channel 16 is connected to the second pressure exhaust branch channel 12.

[0034] In the present embodiment, the first pressure relief branch channel 16 is connected to the second pressure relief branch channel 12. When thermal runaway occurs in the battery cell 21, the ejecta generated by the battery cell 21 can enter the first pressure relief branch channel 16 through the first air duct 13, and then enter the second pressure relief branch channel 12 through the first pressure relief branch channel 16, and finally be discharged from the second pressure relief branch channel 12 to the outside of the battery box 10, so as to prevent the ejecta generated by the thermal runaway battery cell from acting on the surrounding battery cells 21, thereby reducing the risk of heat diffusion.

[0035] See also Figures 1 to 6 As shown, in one embodiment of the present invention, the battery box 10 further has a second mounting cavity 14 , the first mounting cavity 11 and the second mounting cavity 14 are independently arranged, and the second mounting cavity 14 is configured to be used for mounting a high-voltage component 200 .

[0036] In this embodiment, the second installation cavity 14 is used to install a high-voltage component 200 (such as a high-voltage distribution box), and the battery module 20 is installed in the first installation cavity 11. Through the above arrangement, the high-voltage component 200 and the low-voltage component can be isolated, thereby preventing the high-voltage ejecta generated by thermal runaway of the battery cell 21 from acting on the high-voltage component 200, causing the high-voltage component 200 to produce high-voltage arcing, breakdown, and the like.

[0037] See also Figures 1 to 6As shown, in one embodiment of the utility model, the battery pack also includes a first end plate 70 and a second end plate 80, and the first end plate 70 and the second end plate 80 are arranged in the battery box 10 at intervals along the second direction to form a first installation cavity 11 and a second installation cavity 14, and the second end plate 80 and the side wall of the battery box 10 together form a second pressure discharge branch channel 12.

[0038] In this embodiment, the second pressure-discharging branch channel 12 can accommodate a larger amount of ejecta than the first pressure-discharging branch channel 16, and the second pressure-discharging branch channel 12 can ensure that the ejecta in the first pressure-discharging branch channel 16 can be discharged in time. When thermal runaway occurs in the battery cell 21, the ejecta generated by the thermal runaway of the battery cell 21 enters the second pressure-discharging branch channel 12 through the first pressure-discharging branch channel 16, and then is discharged to the outside of the battery box 10 through the second pressure-discharging branch channel 12, so as to prevent the ejecta generated by the thermal runaway battery cell 21 from acting on the surrounding battery cells 21, thereby reducing the risk of heat diffusion.

[0039] See also Figures 1 to 6 As shown, in one embodiment of the utility model, the battery pack also includes a plurality of first adjusting members 30, and the plurality of first adjusting members 30 are arranged in a one-to-one correspondence with the plurality of first air ports 13. The first adjusting members 30 are installed at the first air ports 13. The first adjusting members 30 have an open state in which the first air ports 13 are connected to the first pressure relief branch channel 16, and a closed state in which the first air ports 13 are disconnected from the first pressure relief branch channel 16. When the battery cell 21 is in thermal runaway, the first adjusting member 30 corresponding thereto is in an open state.

[0040] In this embodiment, when a battery cell 21 experiences thermal runaway, the first adjustment member 30 corresponding to the battery cell 21 is in an open state, while the first adjustment members 30 corresponding to the remaining battery cells 21 that have not experienced thermal runaway are still in a closed state. At this time, only the first air port 13 corresponding to the battery cell 21 experiencing thermal runaway is connected to the first pressure relief branch channel 16, and the remaining first air ports 13 are not connected to the first pressure relief branch channel 16. This can prevent the ejecta generated by the thermal runaway battery cell 21 from entering the first pressure relief branch channel 16 through the first air port 13 and then flowing out from other first air ports 13 to act on the battery cells 21 that have not experienced thermal runaway.

[0041] Specifically, in the initial state, that is, when all the battery cells 21 do not have thermal runaway, the first adjustment member 30 is in a closed state, and at this time, the first air guide port 13 is not connected to the first pressure discharge branch channel 16. When a battery cell 21 has thermal runaway, the battery cell 21 generates high-temperature and high-pressure gas, and the first adjustment member 30 corresponding to the battery cell 21 is in an open state under the pressure of the high-temperature and high-pressure gas.

[0042] In one embodiment, the first adjusting member 30 is made of an elastic material, such as rubber. When the battery cell 21 is in thermal runaway, the first adjusting member 30 corresponding thereto is in an open state. After the ejecta generated by the thermal runaway of the battery cell 21 are discharged, the first adjusting member 30 can return to a closed state under the action of its own elastic stress.

[0043] See also Figures 1 to 6 As shown, in one embodiment of the present invention, the first adjusting member 30 further includes a bracket 60 , and a plurality of through holes 61 are arranged at intervals on the bracket 60 . The plurality of through holes 61 are arranged in one-to-one correspondence with the plurality of first air guide ports 13 .

[0044] In this embodiment, the bracket 60 is arranged between the battery module 20 and the side wall of the battery box 10, one side of the bracket 60 is in contact with the side of the battery cell 21 provided with the battery cell explosion-proof valve 211, and the other side of the bracket 60 is in contact with the side wall of the battery box 10, and the plurality of through holes 61 are arranged in one-to-one correspondence with the plurality of first air guide ports 13, and the plurality of through holes 61 are arranged in one-to-one correspondence with the plurality of battery cell explosion-proof valves 211. When the battery cell 21 has thermal runaway, the first regulating member 30 is in an open state, and the ejecta generated by the battery cell 21 breaks through the battery cell explosion-proof valve 211 and then passes through the through holes 61 and the first air guide ports 13 in sequence into the first pressure discharge branch channel 16. Through the above arrangement, the ejecta generated by a single battery cell 21 after thermal runaway can be discharged into the first pressure discharge branch channel 16 in a directional manner, and will not escape to other battery cells 21 through the gap between the side wall of the battery box 10 and the battery cell 21.

[0045] See also Figures 1 to 6 As shown, in one embodiment of the utility model, the battery pack also includes an air guide structure 40, which is installed in the first installation cavity 11, and the air guide structure 40 includes a third pressure relief branch channel and a plurality of second air guide ports 41 connected to the third pressure relief branch channel, the third pressure relief branch channel is connected to the second pressure relief branch channel 12, and a plurality of battery cell explosion-proof valves 211 of the battery module 20 adjacent to the air guide structure 40 are arranged in a one-to-one correspondence with the plurality of second air guide ports 41.

[0046] In the present embodiment, when a battery cell 21 adjacent to the gas guide structure 40 experiences thermal runaway, the ejecta generated by the battery cell 21 enters the third pressure relief branch channel through the second gas guide port 41. Since the third pressure relief branch channel is connected to the second pressure relief branch channel 12, the ejecta enters the second pressure relief branch channel 12 through the third pressure relief branch channel, and finally, is discharged from the second pressure relief branch channel 12 to the outside of the battery box 10. Through the above-mentioned arrangement, the ejecta generated by the thermal runaway battery cell 21 can be prevented from acting on the surrounding battery cells 21, thereby reducing the risk of heat diffusion.

[0047] See also Figures 1 to 6As shown, in one embodiment of the utility model, the battery pack also includes multiple second adjusting members 50 and multiple third adjusting members, and the multiple second adjusting members 50 and the multiple third adjusting members are all installed in the third pressure relief branch channel, the second air guide port 41 has a first side and a second side that are relatively set, the multiple second adjusting members 50 are arranged in a one-to-one correspondence with the multiple second air guide ports 41, and the multiple second adjusting members 50 are located on the first side of the second air guide port 41, the multiple third adjusting members are arranged in a one-to-one correspondence with the multiple second air guide ports 41, and the multiple third adjusting members are located on the second side of the second air guide port 41, the second adjusting members 50 and the third adjusting members both have an open state that connects the second air guide port 41 with the third pressure relief branch channel and a closed state that disconnects the second air guide port 41 from the third pressure relief branch channel, when the battery cell 21 is thermally runaway, the second adjusting member 50 or the third adjusting member corresponding thereto is in an open state.

[0048] In this embodiment, there are multiple battery modules 20, and battery modules 20 are arranged on both sides of the air guide structure 40. One end of each second air guide port 41 is arranged in a one-to-one correspondence with the multiple battery cell explosion-proof valves 211 located on one side of the air guide structure 40, and the other end of each second air guide port 41 is arranged in a one-to-one correspondence with the multiple battery cell explosion-proof valves 211 located on the other side of the air guide structure 40. Multiple second adjusting members 50 are arranged in a one-to-one correspondence with the multiple second air guide ports 41, and the multiple second adjusting members 50 are located on the first side of the second air guide ports 41. Multiple third adjusting members are arranged in a one-to-one correspondence with the multiple second air guide ports 41, and the multiple third adjusting members are located on the second side of the second air guide ports 41. When the battery cell 21 located on the first side of the second air outlet 41 experiences thermal runaway, the second adjustment member 50 corresponding to the battery cell 21 is in an open state, and the ejecta generated by the battery cell 21 enters the third pressure relief branch channel through the second air outlet 41, then enters the second pressure relief branch channel 12 through the third pressure relief branch channel, and finally is discharged from the battery box 10 from the second pressure relief branch channel 12.

[0049] Similarly, when the battery cell 21 located on the second side of the second air guide 41 has thermal runaway, the third adjustment member corresponding to the battery cell 21 is in an open state, and the ejecta generated by the battery cell 21 enters the third pressure discharge branch channel through the second air guide 41, then enters the second pressure discharge branch channel 12 through the third pressure discharge branch channel, and finally discharges from the battery box 10 from the second pressure discharge branch channel 12. Through the above arrangement, when the battery cell 21 adjacent to the air guide structure 40 has thermal runaway, it is possible to achieve directional discharge of the ejecta generated by the thermal runaway battery cell 21, so that it enters the second pressure discharge branch channel 12 through the third pressure discharge branch channel, and then discharges from the battery from the second pressure discharge branch channel 12, thereby preventing the ejecta generated by the thermal runaway battery cell 21 from acting on the surrounding battery cells 21, thereby reducing the risk of heat diffusion.

[0050] See also Figures 1 to 6As shown, in one embodiment of the present invention, there are multiple battery modules 20 and multiple air guide structures 40, and the multiple air guide structures 40 are arranged in the first installation cavity 11 at intervals along the first direction, and a battery module 20 is arranged between two adjacent air guide structures 40.

[0051] In this embodiment, a battery module 20 is arranged between two adjacent gas guide structures 40. When a battery cell 21 adjacent to the gas guide structure 40 experiences thermal runaway, the ejecta generated by the battery cell 21 enters the third pressure relief branch channel through the second gas guide port 41, and then enters the second pressure relief branch channel 12 through the third pressure relief branch channel, and finally, is discharged from the second pressure relief branch channel 12 to the outside of the battery box 10, which can prevent the ejecta generated by the thermal runaway battery cell 21 from acting on the surrounding battery cells 21, thereby reducing the risk of heat diffusion.

[0052] See also Figures 1 to 6 As shown, in one embodiment of the utility model, the battery pack also includes a cover plate 90, which is located on the top of the battery module 20, and the cover plate 90 is installed on the battery box 10. The setting of the cover plate 90 can protect the battery module 20 in the first installation cavity 11.

[0053] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: a battery box and a battery module are provided, and a plurality of first air guide ports are provided on at least one side wall of the battery box. The plurality of first air guide ports are arranged in one-to-one correspondence with the plurality of battery cell explosion-proof valves. When a battery cell in the battery module suffers from thermal runaway, the ejecta generated by the battery cell first breaks through the battery cell explosion-proof valve, and then enters the pressure relief channel through the first air guide port in sequence, and is then discharged to the outside of the battery box through the pressure relief channel, thereby preventing the ejecta generated by the thermal runaway battery cell from acting on the surrounding battery cells, causing the temperature of the surrounding battery cells to increase, thereby reducing the risk of heat diffusion.

[0054] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: include: A battery box (10) having a first installation cavity (11) and a pressure relief channel, wherein the pressure relief channel is configured to be able to communicate with the outside of the battery box (10), and at least one side wall of the battery box (10) is provided with a plurality of first air guide ports (13), and the plurality of first air guide ports (13) are all in communication with the pressure relief channel; A battery module (20) is installed in the first installation cavity (11), the battery module (20) comprising a plurality of battery cells (21) arranged in sequence, a battery cell explosion-proof valve (211) being arranged on the side of each of the battery cells (21), and a plurality of the first air guide ports (13) and a plurality of the battery cell explosion-proof valves (211) being arranged in a one-to-one correspondence.

2. The battery pack according to claim 1, characterized in that: The pressure relief channel comprises a first pressure relief branch channel (16); two opposite side walls of the battery box (10) each have the first pressure relief branch channel (16) and a plurality of the first air guide ports (13) connected to the first pressure relief branch channel (16); the first pressure relief branch channel (16) is configured to be able to communicate with the outside of the battery box (10).

3. The battery pack according to claim 1, characterized in that: The pressure relief channel comprises a first pressure relief branch channel (16) and a second pressure relief branch channel (12); the second pressure relief branch channel (12) is configured to be able to communicate with the outside of the battery box (10); two opposite side walls of the battery box (10) each have the first pressure relief branch channel (16) and a plurality of the first air guide ports (13) connected to the first pressure relief branch channel (16); the first pressure relief branch channel (16) is connected to the second pressure relief branch channel (12).

4. The battery pack according to claim 2 or 3, characterized in that: The battery pack further comprises a plurality of first adjusting members (30), the plurality of first adjusting members (30) being arranged in one-to-one correspondence with the plurality of first air guide ports (13), the first adjusting members being installed at the first air guide ports (13), the first adjusting members (30) having an open state in which the first air guide ports (13) are connected to the first pressure relief branch channel (16), and a closed state in which the first air guide ports (13) are not connected to the first pressure relief branch channel (16), and when the battery cell (21) is in thermal runaway, the first adjusting member (30) arranged corresponding thereto is in the open state.

5. The battery pack according to claim 4, characterized in that: The battery pack further comprises a bracket (60), on which a plurality of through holes (61) are arranged at intervals, and the plurality of through holes (61) are arranged in a one-to-one correspondence with the plurality of first air guide ports (13).

6. The battery pack according to claim 3, characterized in that: The battery pack also includes an air guide structure (40), the air guide structure (40) is installed in the first installation cavity (11), the air guide structure (40) includes a third pressure relief branch channel and a plurality of second air guide ports (41) connected to the third pressure relief branch channel, the third pressure relief branch channel is connected to the second pressure relief branch channel (12), and the plurality of battery cell explosion-proof valves (211) of the battery module (20) adjacent to the air guide structure (40) are arranged in a one-to-one correspondence with the plurality of second air guide ports (41).

7. The battery pack according to claim 6, characterized in that: The battery pack further comprises a plurality of second adjusting members (50) and a plurality of third adjusting members, wherein the plurality of second adjusting members (50) and the plurality of third adjusting members are all installed in the third pressure relief branch channel, the second air guide port (41) has a first side and a second side which are arranged opposite to each other, the plurality of second adjusting members (50) are arranged in a one-to-one correspondence with the plurality of second air guide ports (41), and the plurality of second adjusting members (50) are located on the first side of the second air guide port (41), the plurality of third adjusting members are arranged in a one-to-one correspondence with the plurality of second air guide ports (41), and the plurality of third adjusting members are located on the second side of the second air guide port (41), the second adjusting members (50) and the third adjusting members both have an open state in which the second air guide port (41) is connected to the third pressure relief branch channel and a closed state in which the second air guide port (41) is not connected to the third pressure relief branch channel, and when the battery cell (21) is thermally runaway, the second adjusting member (50) or the third adjusting member arranged corresponding to it is in the open state.

8. The battery pack according to claim 6, characterized in that: The battery modules (20) and the gas guide structures (40) are both multiple in number, and the multiple gas guide structures (40) are arranged in the first installation cavity (11) at intervals along a first direction, and one battery module (20) is arranged between two adjacent gas guide structures (40).

9. The battery pack according to claim 3, characterized in that: The battery box (10) further comprises a second mounting cavity (14); the first mounting cavity (11) and the second mounting cavity (14) are arranged independently of each other; and the second mounting cavity (14) is configured to be used for mounting high-voltage components.

10. The battery pack according to claim 9, characterized in that: The battery pack further comprises a first end plate (70) and a second end plate (80), wherein the first end plate (70) and the second end plate (80) are arranged in the battery box (10) at intervals along a second direction to form the first installation cavity (11) and the second installation cavity (14), and the second end plate (80) and the side wall of the battery box (10) together enclose the second pressure discharge branch channel (12).

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