Pole group assembly, battery cell and battery pack

Abstract

The utility model discloses a pole group assembly, a battery cell and a battery pack. The pole group assembly is used for the battery cell and comprises a pole group, the shell is internally provided with a mounting space, the pole group is arranged in the mounting space, the peripheral wall of the shell is internally provided with a first exhaust channel, the first exhaust channel is communicated with the exhaust valve of the battery cell, and the first exhaust channel is provided with an opening communicated with the mounting space; the filtering assembly is arranged at the opening. According to the pole group assembly disclosed by the utility model, substances in the pole group, which are erupted along with gas in a gas exhausting process, can be blocked, so that the exhaust valve is prevented from being blocked, the gas is effectively exhausted, heat spreading of the battery core is prevented, and the safety is improved.

Description

Technical Field

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

[0002] Traditional battery cell pressure relief valves are generally placed on the battery cell cover. When the battery cell experiences thermal runaway, the side reaction inside the pole piece produces gas that reaches a certain pressure, and then the pressure relief valve opens to discharge the gas from inside the battery cell to prevent explosion caused by excessive pressure, which would cause greater harm. In actual battery cell thermal runaway experiments, it was found that the internal materials of some battery cells during thermal runaway would block the pressure relief valve, affecting the normal opening of the pressure relief valve, resulting in the obstruction of the battery cell pressure relief process, thereby accelerating the spread of heat in the battery cell and affecting the safety of the battery cell. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a pole group component, which prevents the exhaust valve from being blocked, ensures effective gas discharge, prevents the thermal spread of the battery core, and improves safety.

[0004] The utility model also provides a battery core, comprising the above-mentioned electrode group component.

[0005] The utility model also provides a battery pack, comprising the above-mentioned battery cell.

[0006] According to the electrode group assembly of the embodiment of the utility model, it is used for a battery cell and includes: a electrode group; a shell having an installation space therein, the electrode group is arranged in the installation space, a first exhaust channel is provided in the peripheral wall of the shell, the first exhaust channel is connected to the exhaust valve of the battery cell, and the first exhaust channel has an opening connected to the installation space; a filter assembly, the filter assembly is arranged at the opening.

[0007] According to the electrode group assembly of the embodiment of the utility model, a first exhaust channel is arranged in the peripheral wall of the shell, the first exhaust channel is connected to the exhaust valve of the battery cell, an opening connected to the installation space is arranged in the first exhaust channel, and the filter assembly is arranged at the opening, so as to block the internal substances of the electrode group ejected with the gas during the gas discharge process, thereby preventing the exhaust valve from being blocked, ensuring the effective discharge of gas, preventing the heat spread of the battery cell, and improving safety.

[0008] In some embodiments of the present invention, the filter assembly includes a first filter element and a second filter element, and in the direction from the installation space to the first exhaust channel, the first filter element and the second filter element are sequentially spaced apart.

[0009] In some embodiments of the present invention, the first filter element includes a plurality of first connecting ribs and a plurality of second connecting ribs that are staggered, and the first connecting ribs and the second connecting ribs form an angle with each other.

[0010] In some embodiments of the present invention, the second filter element includes a filter plate having a filter mesh area, the filter mesh area includes a plurality of rows of sub-filter holes spaced apart in a radial direction of the filter mesh area, and each row of the sub-filter holes includes a plurality of the sub-filter holes spaced apart in a circumferential direction of the filter mesh area.

[0011] In some embodiments of the present invention, the filter mesh area is a plurality of spaced-apart ones; and / or the number of the sub-filter holes in each row is the same, all the sub-filter holes in the filter mesh area are arranged in multiple columns along the circumference of the filter mesh area, and along the radial outward direction of the filter mesh area, the lengths of the multiple sub-filter holes in the same column along the circumferential direction of the filter mesh area gradually increase.

[0012] In some embodiments of the utility model, a plurality of first exhaust channels are spaced apart along the circumferential direction of the shell, a second exhaust channel is further provided in the shell, a second exhaust channel is provided between any two adjacent first exhaust channels, the second exhaust channel extends along the axial direction of the shell, and each of the first exhaust channels is respectively connected to two adjacent second exhaust channels at both ends along the circumferential direction of the shell, and the first exhaust channel is connected to the exhaust valve of the battery cell through the second exhaust channel.

[0013] In some embodiments of the utility model, a partition plate is provided in the second exhaust channel for dividing the second exhaust channel into a first channel and a second channel, the first channel and the second channel are both connected to the exhaust valve, and along the circumferential direction of the shell, one of the two first exhaust channels located on both sides of the second exhaust channel is connected to the first channel, and the other is connected to the second channel.

[0014] In some embodiments of the present invention, the outer contour of the shell is formed into a rectangular structure, the first exhaust channels are provided at four planes of the shell corresponding to the shell, and the second exhaust channels are provided at four corners of the shell corresponding to the shell.

[0015] The battery cell according to the embodiment of the utility model comprises: a shell, at least one side of which is open; a cover plate, the open side cover of the shell is provided with the cover plate, at least one of the cover plates has an exhaust valve; the above-mentioned pole group assembly, the pole group assembly is arranged in the shell, and the first exhaust channel is connected to the exhaust valve.

[0016] According to the battery cell of the embodiment of the utility model, by setting the above-mentioned electrode group assembly, a first exhaust channel is set in the peripheral wall of the shell, the first exhaust channel is connected with the exhaust valve of the battery cell, an opening connected with the installation space is set in the first exhaust channel, and the filter assembly is arranged at the opening, so as to block the internal substances of the electrode group ejected with the gas during the gas discharge process, thereby preventing the exhaust valve from being blocked, ensuring the effective discharge of gas, preventing the heat spread of the battery cell, and improving the safety.

[0017] A battery pack according to an embodiment of the present invention includes the above-mentioned battery cell.

[0018] According to the battery pack of the embodiment of the utility model, by setting the above-mentioned battery cell and the above-mentioned electrode group assembly, a first exhaust channel is set in the peripheral wall of the shell, the first exhaust channel is connected with the exhaust valve of the battery cell, an opening connected with the installation space is set in the first exhaust channel, and the filter assembly is arranged at the opening, so as to block the internal substances of the electrode group ejected with the gas during the gas discharge process, thereby preventing the exhaust valve from being blocked, ensuring the effective discharge of gas, preventing the heat spread of the battery cell, and improving safety.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is an exploded view of a filter assembly of a pole group assembly according to an embodiment of the utility model, wherein the housing portion is shown;

[0022] Figure 2 is a top view of a first filter element of a filter assembly of a pole group assembly according to an embodiment of the utility model;

[0023] Figure 3 is a top view of a second filter element of a filter assembly of a pole group assembly according to an embodiment of the utility model;

[0024] Figure 4 is a cross-sectional view of a housing of a pole group assembly according to an embodiment of the utility model;

[0025] Figure 5 yes Figure 4 The enlarged view of point A in the middle;

[0026] Figure 6 is a side view of a pole group assembly according to an embodiment of the utility model, wherein the pole group is not shown;

[0027] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0028] Reference numerals:

[0029] 10. Pole group components;

[0030] 1. Shell; 11. First exhaust channel; 12. Second exhaust channel; 121. First channel; 122. Second channel; 13. Installation space; 14. Partition plate;

[0031] 2. Filter assembly; 21. First filter element; 211. First connecting rib; 212. Second connecting rib; 213. Ventilation hole; 22. Second filter element; 221. Filter plate; 222. Filter mesh area; 223. Sub-filter hole. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 7 A pole group assembly 10 according to an embodiment of the present invention is described.

[0036] like Figure 1-Figure 7 As shown, the pole group assembly 10 according to an embodiment of the utility model is used for a battery cell and includes: a pole group, a shell 1 and a filter assembly 2.

[0037] Specifically, refer to Figure 4-Figure 6 The shell 1 has an installation space 13, the pole group (not shown in the figure) is arranged in the installation space 13, the shell 1 has a first exhaust channel 11 in the peripheral wall, the first exhaust channel 11 is connected to the exhaust valve of the battery cell (not shown in the figure), and the first exhaust channel 11 has an opening connected to the installation space 13; the filter component 2 is arranged at the opening.

[0038] It can be understood that the shell 1 is insulating, thereby avoiding the risk of leakage caused by contact between the pole group and the external structure. The shell 1 has through holes at both axial ends for the pole ears of the pole group to pass through and connect with the cover of the battery cell, thereby realizing electrical output. When thermal runaway occurs inside the pole group, the material inside the pole group will flow to the opening with the gas and flow to the exhaust valve through the first exhaust channel 11. By arranging a filter component 2 at the opening, the internal material of the pole group ejected with the gas during the gas discharge process can be blocked, thereby preventing the exhaust valve from being blocked, ensuring effective gas discharge, preventing the occurrence of thermal propagation of the battery cell, and improving safety.

[0039] According to the pole group assembly 10 of the embodiment of the utility model, a first exhaust channel 11 is arranged in the peripheral wall of the shell 1, the first exhaust channel 11 is connected to the exhaust valve of the battery cell, an opening connected to the installation space 13 is arranged in the first exhaust channel 11, and the filter assembly 2 is arranged at the opening, so as to block the internal substances of the pole group ejected with the gas during the gas discharge process, thereby preventing the exhaust valve from being blocked, ensuring the effective discharge of gas, preventing the heat spread of the battery cell, and improving safety.

[0040] In some embodiments of the present invention, Figure 1 , Figure 4 and Figure 5 As shown, the filter assembly 2 includes a first filter element 21 and a second filter element 22, and the first filter element 21 and the second filter element 22 are arranged in sequence in the direction from the installation space 13 to the first exhaust channel 11. The first filter element 21 is arranged close to the pole group relative to the second filter element 22, so that the gas can be filtered by the first filter element 21 and the second filter element 22 in sequence during the exhaust process through the arrangement of the first filter element 21 and the second filter element 22, thereby improving the filtering effect, further blocking the internal substances of the pole group ejected with the gas during the gas exhaust process, thereby preventing the exhaust valve from being blocked, ensuring the effective exhaust of the gas, preventing the thermal spread of the battery cell, and improving the safety.

[0041] In some embodiments of the present invention, Figure 2 As shown, the first filter element 21 includes a plurality of first connecting ribs 211 and a plurality of second connecting ribs 212 that are staggered, and the first connecting ribs 211 and the second connecting ribs 212 form an angle with each other.

[0042] It can be understood that the multiple first connecting ribs 211 and the multiple second connecting ribs 212 are staggered to form a plurality of spaced apart vents 213, wherein the vents 213 can ensure that the gas passes through and flows to the first exhaust channel 11, thereby ensuring smooth exhaust. At the same time, since the multiple vents 213 are spaced apart, the passage of large particles can be blocked, thereby blocking the internal materials of the pole group ejected with the gas, thereby further preventing the exhaust valve from being blocked, ensuring effective gas discharge, preventing the occurrence of heat spread in the battery cell, and improving safety.

[0043] exist Figure 2 In the example shown, the first connecting rib 211 and the second connecting rib 212 are perpendicular to each other, but the present invention is not limited thereto, and the angle between the first connecting rib 211 and the second connecting rib 212 may be 30°, 40°, 45° or 50°, etc.

[0044] In some embodiments of the present invention, Figure 3 As shown, the second filter element 22 includes a filter plate 221, and the filter plate 221 has a filter mesh area 222. The filter mesh area 222 includes multiple rows of sub-filter holes 223 spaced apart in the radial direction of the filter mesh area 222, and each row of sub-filter holes 223 includes multiple sub-filter holes 223 spaced apart in the circumferential direction of the filter mesh area 222. The radial direction is the radial direction of a circle with the center of the filter mesh area 222 as the center.

[0045] It can be understood that multiple sub-filter holes 223 can allow gas to pass through and flow to the first exhaust channel 11, ensuring smooth exhaust. At the same time, since multiple rows of sub-filter holes 223 are spaced apart in the radial direction of the filter mesh area 222, multiple sub-filter holes 223 in each row of sub-filter holes 223 are spaced apart in the circumferential direction of the filter mesh area 222, it is possible to block the internal substances of the pole group ejected with the gas, thereby further preventing the exhaust valve from being blocked, ensuring effective gas discharge, preventing heat spread of the battery cell, and improving safety.

[0046] In some embodiments of the present invention, Figure 3As shown, the filter mesh area 222 is spaced apart from each other, so when thermal runaway occurs at any part of the battery cell, the filter mesh area 222 at the corresponding position can conduct gas and block the ejection of the electrode group, reduce the impact of the thermal runaway part of the battery cell on other parts of the battery cell, reduce the degree of reaction, prevent the thermal spread of the battery cell, and improve the safety of the battery cell. Figure 3 In the example shown, there are four filter mesh areas 222 spaced apart from each other, but the present invention is not limited thereto, and the filter mesh areas 222 may also be spaced apart from each other in other numbers, such as 3, 5, 6 or 7.

[0047] and / or, if Figure 3 As shown, the number of sub-filter holes 223 in each row is the same, and all sub-filter holes 223 in the filter mesh area 222 are arranged in multiple rows along the circumference of the filter mesh area 222. Along the radial outward direction of the filter mesh area 222, the lengths of the multiple sub-filter holes 223 in the same row along the circumferential direction of the filter mesh area 222 gradually increase. It can be understood that along the radial outward direction of the filter mesh area 222, the circumference of the filter mesh area 222 gradually increases, and the lengths of the multiple sub-filter holes 223 in the same row along the circumferential direction of the filter mesh area 222 gradually increase, thereby facilitating the arrangement and layout of the multiple sub-filter holes 223 on the filter mesh area 222, making the arrangement reasonable and convenient for production and manufacturing.

[0048] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, the first exhaust channels 11 are multiple and spaced apart along the circumferential direction of the housing 1, thereby improving the exhaust efficiency, further ensuring the effective exhaust of gas, preventing the thermal spread of the battery core, and improving safety. Figure 6 In the example shown, there are four first exhaust channels 11 spaced apart along the circumferential direction of the shell 1, but the present invention is not limited thereto. The first exhaust channels 11 may be other numbers spaced apart along the circumferential direction of the shell 1, such as 3, 5, 6 or 7.

[0049] Furthermore, if Figure 6 and Figure 7 As shown, a second exhaust channel 12 is further provided in the shell 1, and a second exhaust channel 12 is provided between any two adjacent first exhaust channels 11. The second exhaust channel 12 extends along the axial direction of the shell 1, and each first exhaust channel 11 is connected to the two adjacent second exhaust channels 12 at both ends along the circumferential direction of the shell 1, and the first exhaust channel 11 is connected to the exhaust valve of the battery cell through the second exhaust channel 12.

[0050] It can be understood that since a second exhaust channel 12 is provided between any two adjacent first exhaust channels 11, the gas in any two adjacent first exhaust channels 11 can be gathered into the second exhaust channel 12 and flow from the second exhaust channel 12 to the exhaust valve. Therefore, the second exhaust channel 12 plays the role of gathering and guiding the airflow, avoiding the gas from flowing freely in the electrode assembly 10, and at the same time making the exhaust efficiency higher, further ensuring the effective discharge of the gas, preventing the thermal propagation of the battery cell, and improving the safety.

[0051] Therefore, the exhaust path of the gas is: from the installation space 13, through the filtration of the filter assembly 2, into the first exhaust channel 11, then through the second exhaust channel 12 to the exhaust valve, and finally discharged from the exhaust valve.

[0052] In some embodiments of the utility model, there is a connecting channel between the second exhaust channel 12 and the exhaust valve, and multiple second exhaust channels 12 are connected to the connecting channel, and the exhaust valve is connected to the connecting channel. Therefore, the gas from the multiple second exhaust channels 12 can be collected in the connecting channel and discharged to the exhaust valve together. Compared with setting multiple exhaust valves corresponding to the second exhaust channels one by one, the setting of exhaust valves is reduced, thereby simplifying the structure of the battery cell and reducing production costs.

[0053] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, a partition plate 14 is provided in the second exhaust channel 12 for dividing the second exhaust channel 12 into a first channel 121 and a second channel 122. Both the first channel 121 and the second channel 122 are connected to the exhaust valve. Along the circumferential direction of the shell 1, one of the two first exhaust channels 11 located on both sides of the second exhaust channel 12 is connected to the first channel 121, and the other is connected to the second channel 122.

[0054] It can be understood that the first channel 121 and the second channel 122 are separated so that the gases in the two first exhaust channels 11 on both sides of the second exhaust channel 12 along the circumferential direction of the shell 1 are not connected to each other, thereby achieving the zoned discharge of thermal runaway gas at different positions of the battery cell, avoiding the impact on other positions of the battery cell, reducing the severity of thermal runaway, preventing the occurrence of heat spread in the battery cell, and improving the safety of the battery cell.

[0055] In some embodiments of the present invention, Figure 6 and Figure 7 As shown, the outer contour of the shell 1 is formed into a rectangular parallelepiped structure, and first exhaust channels 11 are respectively provided at four planes of the shell 1 corresponding to the shell 1 , and second exhaust channels 12 are respectively provided at four corners of the shell 1 corresponding to the shell 1 .

[0056] It can be understood that the gas at each first exhaust channel 11 can flow to the two second exhaust channels 12 respectively through both sides of the length direction of the first exhaust channel 11. Therefore, the gas generated when the pole group is abnormal can flow to the first exhaust channel 11 from the four planes of the shell 1, and flow to the exhaust valve from the second exhaust channels 12 at the four corners. Therefore, the exhaust efficiency is improved, the effective discharge of the gas is further ensured, the heat spread of the battery cell is prevented, and the safety is improved.

[0057] The following describes a battery cell according to an embodiment of the present invention.

[0058] The battery cell according to the embodiment of the utility model comprises: a housing, a cover plate and the above-mentioned electrode group assembly 10.

[0059] Specifically, at least one side of the housing is open; the open side cover of the housing is provided with a cover plate, and at least one cover plate has an exhaust valve; the pole group assembly 10 is provided in the housing, and the first exhaust channel 11 is connected to the exhaust valve. It can be understood that the housing and the cover plate are used to protect the pole group assembly 10, and the first exhaust channel 11 is connected to the exhaust valve, so that the gas generated inside the pole group assembly 10 can be discharged to the exhaust valve. When the gas pressure reaches a certain value, the exhaust valve opens, so that the gas can be discharged to the external environment, avoiding excessive pressure inside the pole group assembly 10, and improving the safety of the battery cell.

[0060] According to the battery cell of the embodiment of the utility model, by setting the above-mentioned electrode group assembly 10, a first exhaust channel 11 is set in the peripheral wall of the shell 1, the first exhaust channel 11 is connected with the exhaust valve of the battery cell, an opening connected with the installation space 13 is set in the first exhaust channel 11, and the filter assembly 2 is arranged at the opening, so as to block the internal substances of the electrode group ejected with the gas during the gas discharge process, thereby preventing the exhaust valve from being blocked, ensuring the effective discharge of gas, preventing the heat spread of the battery cell, and improving the safety.

[0061] A battery pack according to an embodiment of the present invention is described below.

[0062] A battery pack according to an embodiment of the present invention includes the above-mentioned battery cell.

[0063] According to the battery pack of the embodiment of the utility model, by setting the above-mentioned battery cell and the above-mentioned electrode group assembly 10, a first exhaust channel 11 is set in the peripheral wall of the shell 1, the first exhaust channel 11 is connected with the exhaust valve of the battery cell, an opening connected with the installation space 13 is set in the first exhaust channel 11, and the filter assembly 2 is arranged at the opening, so as to block the internal substances of the electrode group ejected with the gas during the gas discharge process, thereby preventing the exhaust valve from being blocked, ensuring the effective discharge of gas, preventing the heat spread of the battery cell, and improving safety.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] 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 spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A pole group assembly, characterized in that: For battery cells and comprising: Pole group; A housing, wherein the housing has an installation space, the electrode group is arranged in the installation space, a first exhaust channel is provided in a peripheral wall of the housing, the first exhaust channel is communicated with an exhaust valve of the battery cell, and the first exhaust channel has an opening communicated with the installation space; A filter assembly is arranged at the opening.

2. The pole group assembly according to claim 1, characterized in that: The filter assembly includes a first filter element and a second filter element. In a direction from the installation space to the first exhaust passage, the first filter element and the second filter element are sequentially spaced apart.

3. The pole group assembly according to claim 2, characterized in that: The first filter element includes a plurality of first connecting ribs and a plurality of second connecting ribs that are staggered, and the first connecting ribs and the second connecting ribs form an angle with each other.

4. The pole group assembly according to claim 2, characterized in that: The second filter element comprises a filter plate having a filter mesh area thereon. The filter mesh area comprises a plurality of rows of sub-filter holes spaced apart in a radial direction of the filter mesh area. Each row of sub-filter holes comprises a plurality of sub-filter holes spaced apart in a circumferential direction of the filter mesh area.

5. The pole group assembly according to claim 4, characterized in that: The filter screen areas are multiple and spaced apart; And / or, the number of the sub-filter holes in each row is the same, all the sub-filter holes in the filter mesh area are arranged in multiple columns along the circumference of the filter mesh area, and along the radial outward direction of the filter mesh area, the lengths of the multiple sub-filter holes in the same column along the circumferential direction of the filter mesh area gradually increase.

6. The pole group assembly according to claim 1, characterized in that: The first exhaust channels are multiple and spaced apart along the circumferential direction of the shell. A second exhaust channel is also provided in the shell. The second exhaust channel is provided between any two adjacent first exhaust channels. The second exhaust channel extends along the axial direction of the shell. Both ends of each first exhaust channel along the circumferential direction of the shell are respectively connected to two adjacent second exhaust channels. The first exhaust channel is connected to the exhaust valve of the battery cell through the second exhaust channel.

7. The pole group assembly according to claim 6, characterized in that: A partition plate is provided in the second exhaust channel for dividing the second exhaust channel into a first channel and a second channel. Both the first channel and the second channel are connected to the exhaust valve. Along the circumferential direction of the shell, one of the two first exhaust channels located on both sides of the second exhaust channel is connected to the first channel, and the other is connected to the second channel.

8. The pole group assembly according to claim 6, characterized in that: The outer contour of the shell is formed into a rectangular parallelepiped structure. The first exhaust channels are respectively arranged at four planes of the shell corresponding to the shell, and the second exhaust channels are respectively arranged at four corners of the shell corresponding to the shell.

9. A battery cell, characterized in that: include: a housing, wherein at least one side of the housing is open; A cover plate, the open side cover of the housing is provided with the cover plate, at least one of the cover plates is provided with an exhaust valve; According to any one of claims 1-8, the pole group assembly is arranged in the outer shell, and the first exhaust channel is connected to the exhaust valve.

10. A battery pack, characterized in that: Comprising the battery cell according to claim 9.

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