Pole group assembly and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a pole group assembly and a battery monomer, which comprise a first pole group, a second pole group and a protective frame, the first pole group and the second pole group are arranged along a first direction, a first tab extends out of one end, facing the second pole group, of the first pole group, a second tab extends out of one end, facing the first pole group, of the second pole group, and the first tab is conductively connected with the second tab. The protective frame comprises side plates and reinforcing pieces, the side plates are located on the end sides of the first pole group and the second pole group in the second direction, and the side plates extend from the outer wall of the first pole group to the outer wall of the second pole group in the first direction. The reinforcers are located on the sides, away from the first pole group and the second pole group, of the side plates in the second direction. The pole group assembly is low in production difficulty and high in energy density; and the yield of the battery monomers is high. The battery monomer comprises a shell, a cover plate assembly and the pole group assembly, and has relatively high energy density, relatively low production difficulty and relatively high yield.

Description

Technical Field

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

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the energy density requirements for lithium-ion batteries are increasing. Lithium-ion batteries generally include a shell and a pole group, and the pole group is assembled in the shell. In order to increase the energy density of the battery, it is necessary to produce pole groups and shells with longer lengths. When the longer pole group is pushed into the shell, since the shell is mostly made of metal, the wall thickness is relatively thin, and the opening is relatively sharp, there is a risk of scratching the pole group and bending in the middle, which reduces the yield rate of the battery. Although, in the prior art, side plates are provided on the outer wall of the pole group to prevent the pole group from being scratched when entering the shell. However, the side plates usually only play an isolating and protective role, are relatively thin, and are easily deformed, and cannot truly protect and support the pole group.

[0003] Therefore, there is an urgent need to provide a pole group assembly and a battery cell to solve the above problems. Utility Model Content

[0004] The first object of the present utility model is to provide a pole group assembly with low production difficulty and high energy density; when the pole group assembly is installed in the shell, the probability of the first pole group and the second pole group being scratched is low; and the structural strength of the protective frame is high, preventing the first pole group, the second pole group and the side plate from deforming, increasing the structural strength of the pole group assembly, and improving the yield rate of battery cells.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Electrode assembly, including:

[0007] a first electrode group and a second electrode group, wherein the first electrode group and the second electrode group are arranged along a first direction, a first electrode tab extends from one end of the first electrode group toward the second electrode group, and a second electrode tab extends from one end of the second electrode group toward the first electrode group, and the first electrode tab is conductively connected to the second electrode tab;

[0008] a protective frame, the protective frame comprising a side plate and a reinforcement, the side plate being located at an end side of the first pole group and the second pole group along the second direction, the side plate extending from an outer wall of the first pole group to an outer wall of the second pole group along the first direction, and the reinforcement being located on a side of the side plate away from the first pole group and the second pole group along the second direction;

[0009] The first direction is the length direction of the first pole group and the second pole group, and the second direction is the width direction of the first pole group and the second pole group.

[0010] Optionally, the reinforcement includes a raised support rib extending along the first direction.

[0011] Optionally, there are two raised support ribs, and the two raised support ribs are respectively located at the end side edges of the side plate support frame.

[0012] Optionally, the protection frame further includes an end plate, the end plate is located at one end of the first pole group away from the second pole group or one end of the second pole group away from the first pole group, and the end plate is connected to the side plate.

[0013] Optionally, there are two side plates and two end plates, and the two side plates and the two end plates are connected end to end and arranged around the first pole group and the second pole group.

[0014] Optionally, the protective frame further includes a supporting element, which is connected to the side of the side plate close to the first pole group and the second pole group, and is clamped between the first pole group and the second pole group, and the first pole ear and the second pole ear are both located in the supporting element.

[0015] Optionally, a connecting cavity is provided in the supporting element, and the first electrode tab and the second electrode tab are both arranged through the supporting element along the first direction and are located in the connecting cavity.

[0016] Optionally, a plurality of first air holes are provided on the side wall of the connecting cavity.

[0017] A second object of the present invention is to provide a battery cell having higher energy density, lower production difficulty and higher yield.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A battery cell comprises a shell, a cover plate assembly and the above-mentioned electrode group assembly, wherein the electrode group assembly is located in the shell, and the cover plate assembly is arranged to cover the opening of the shell.

[0020] Optionally, the battery cell further includes an insulating film, which is wrapped around the outside of the electrode group assembly and located inside the shell.

[0021] Beneficial effects of the utility model:

[0022] The present invention provides an electrode assembly comprising a first electrode group, a second electrode group, and a protective frame. The first and second electrode groups are arranged along a first direction, with the first and second electrode tabs conductively connected. Compared to the prior art method of producing longer electrode groups, this electrode assembly is produced by producing shorter first and second electrode groups and then conductively connecting them to form a longer electrode group. This reduces the difficulty of electrode assembly production and improves the energy density of the electrode assembly. The protective frame includes a side plate and a reinforcement, with the reinforcement located on the side of the side plate facing away from the first and second electrode groups. The side plate extends from the outer wall of the first electrode group to the outer wall of the second electrode group, protecting the outer walls of the first and second electrode groups. This reduces the chance of the outer walls of the first and second electrode groups being scratched by the housing when the electrode assembly is installed, thereby improving the yield rate of battery cells. Furthermore, the reinforcement provided on the side plate increases the structural strength of the side plate, prevents deformation of the side plate, and enhances the protection and support provided by the protective frame to the first and second electrode groups, thereby increasing the structural strength of the electrode assembly and further improving the yield rate of battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the electrode assembly provided by an embodiment of the present utility model;

[0024] Figure 2 yes Figure 1 Enlarged view at point A;

[0025] Figure 3 This is a schematic structural diagram of a protective frame of a pole group assembly provided by an embodiment of the present utility model;

[0026] Figure 4 yes Figure 3 A schematic diagram of the structure at B;

[0027] Figure 5 yes Figure 3 Structural diagram at C;

[0028] Figure 6 This is an exploded view of a battery cell provided by an embodiment of the present utility model;

[0029] Figure 7 This is a schematic structural diagram of a battery cell housing provided by an embodiment of the present utility model;

[0030] Figure 8 This is a schematic structural diagram of an insulating film of a battery cell provided by an embodiment of the present utility model;

[0031] Figure 9 yes Figure 8 Enlarged view at D;

[0032] Figure 10This is a structural diagram of a first cover plate of a battery cell provided by an embodiment of the present utility model;

[0033] Figure 11 It is a structural schematic diagram of the second cover plate of the battery cell provided by an embodiment of the present utility model.

[0034] In the picture:

[0035] 100, first pole group; 200, second pole group; 300, protective frame; 310, side plate; 311, limit buckle; 320, reinforcement; 330, support element; 331, first air vent; 332, second air vent; 341, first end plate; 342, second end plate;

[0036] 10. Housing; 11. Explosion-proof valve; 20. Cover plate assembly; 21. First cover plate; 22. Second cover plate; 30. Insulating film; 31. Second slit. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

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

[0039] In the present invention, 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 may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0041] The electrode group assembly provided in this embodiment has low production difficulty and high energy density; when the electrode group assembly is installed in the shell, the probability of the first electrode group and the second electrode group being scratched is low; and the protective frame has high structural strength, preventing the first electrode group, the second electrode group and the side plate from deforming, increasing the structural strength of the electrode group assembly, and improving the yield rate of the battery cells.

[0042] Specific as Figure 1 and Figure 2 As shown, the electrode assembly includes a first electrode group 100, a second electrode group 200, and a protective frame 300. The first electrode group 100 and the second electrode group 200 are arranged along a first direction. A first electrode tab extends from one end of the first electrode group 100 facing the second electrode group 200, and a second electrode tab extends from one end of the second electrode group 200 facing the first electrode group 100. The first electrode tab and the second electrode tab are electrically connected. The protective frame 300 includes a side plate 310 and a reinforcement member 320. The side plate 310 is located at the end of the first electrode group 100 and the second electrode group 200 along the second direction. The side plate 310 extends from the outer wall of the first electrode group 100 to the outer wall of the second electrode group 200 along the first direction. The reinforcement member 320 is located on the side of the side plate 310 facing away from the first electrode group 100 and the second electrode group 200 along the second direction. The first direction is the length direction of the first electrode group 100 and the second electrode group 200, and the second direction is the width direction of the first electrode group 100 and the second electrode group 200.

[0043] Based on the above design, the first and second pole groups 100 and 200 are arranged along a first direction, with the first and second pole tabs electrically connected. The first direction is the length of the first and second pole groups 100 and 200, i.e., the x-direction in the figure. Compared to the prior art method of producing longer pole groups, this pole group assembly is produced by producing shorter first and second pole groups 100 and 200, and then electrically connecting them to form a longer pole group. This reduces the difficulty of pole group production and improves the energy density of the pole group assembly. The protective bracket includes a side plate 310 and a reinforcement member 320. The side plate 310 is located at the end of the first and second pole groups 100 and 200 along the second direction. The second direction is the width of the first and second pole groups 100 and 200, i.e., the y-direction in the figure. The reinforcement member 320 is located on the side of the side plate 310 facing away from the first and second pole groups 100 and 200. The side panels 310 extend from the outer wall of the first electrode group 100 to the outer wall of the second electrode group 200, protecting the outer walls of the ends of the first and second electrode groups 100 and 200. This reduces the chance of the outer walls of the first and second electrode groups 100 and 200 being scratched by the housing 10 when the electrode group assembly is installed, thereby improving the yield rate of the battery cells. A reinforcement 320 is provided on the side panels 310 to increase the structural strength of the side panels 310, prevent deformation of the side panels 310, and enhance the protection and support provided by the protective frame 300 to the first and second electrode groups 100 and 200, thereby increasing the structural strength of the electrode group assembly and further improving the yield rate of the battery cells.

[0044] In this embodiment, the side panels 310 and the reinforcement members 320 of the protective frame 300 are integrally formed by injection molding, which is a common production process in the art and can also provide the protective frame 300 with better insulation properties.

[0045] Optionally, the reinforcement member 320 includes raised support ribs extending along the first direction. Continuously arranged raised support ribs are simple to arrange and have a good effect of increasing strength.

[0046] Furthermore, in order to better support and strengthen the structural strength of the side panel 310 , there are two raised support ribs, and the two raised support ribs are respectively located at the side edges of the support frame ends of the side panel 310 .

[0047] It should be noted that the spacing between the two ribs is greater than the width of the subsequent explosion-proof valve 11 on the housing 10 .

[0048] like Figure 3 and Figure 4As shown, the protective frame 300 further includes an end plate, which is located at the end of the first pole group 100 facing away from the second pole group 200 or the end of the second pole group 200 facing away from the first pole group 100, and is connected to the side plate 310. The provision of the end plate can increase the structural strength of the protective frame 300 and improve the protection of the first pole group 100 or the second pole group 200.

[0049] Furthermore, there are two side plates 310 and two end plates, which are connected end to end and surround the first pole group 100 and the second pole group 200, thereby protecting and supporting the first pole group 100 and the second pole group 200.

[0050] Furthermore, the end surface of the first pole group 100 facing away from the second pole group 200 and the end surface of the second pole group 200 facing away from the first pole group 100 serve as the pushing surface, and the orthographic projection of the end plate on the pushing surface is equal to the surface area of the pushing surface. In actual production, the end plate of the protective frame 300 is pushed in the first direction to push the pole group assembly into the housing 10. The end plate and the pushing surface are in surface-to-surface contact, and the orthographic projection of the end plate on the pushing surface is equal to the surface area of the pushing surface. Therefore, when the end plate is pushed, the pushing force is distributed to the pushing surface, preventing damage to the pushing surface due to excessive local pressure.

[0051] Alternatively, as Figure 2 、 Figure 3 and Figure 4 As shown, one of the end plates is fixedly connected to the side plate 310 at both ends, and the other end plate is detachably connected to the side plate 310 .

[0052] In some embodiments, the end plate on one side of the first pole group 100 is a first end plate 341 , which is fixedly connected to the side plate 310 ; the end plate on one side of the second pole group 200 is a second end plate 342 , which is snap-connected to the side plate 310 .

[0053] Specifically, a slot is provided on the side wall of the second end plate 342, and a limit buckle is provided on one end of the side plate 310 close to the second end plate 342. The limit buckle abuts against the inner wall of the slot and the side of the second end plate 342 away from the second pole group 200 to limit the position of the second end plate 342.

[0054] In this embodiment, the first end plate 341 and the second end plate 342 can be fixed to the first electrode group 100 and the second electrode group 200 by means of adhesion, hot melting, or the like.

[0055] In this embodiment, the first end plate 341 is a negative end plate, and the second end plate 342 is a positive end plate.

[0056] like Figure 3 and Figure 5As shown, the protective frame 300 further includes a support member 330, which is connected to the side of the side plate 310 near the first pole group 100 and the second pole group 200 and is sandwiched between the first pole group 100 and the second pole group 200. The first pole tab and the second pole tab are both located within the support member 330. The first pole tab and the second pole tab are connected within the support member 330, which protects the first pole tab and the second pole tab. When the pole group assembly is installed into the housing 10 along the first direction, the first pole tab and the second pole tab can be prevented from being deformed or broken.

[0057] In this embodiment, the first electrode tab and the second electrode tab are directly connected, eliminating the need for a conductive connector such as a copper busbar between the first electrode tab and the second electrode tab. This not only reduces the weight of the electrode assembly, but also reduces the resistance between the first electrode group 100 and the second electrode group 200, thereby reducing the internal resistance of the electrode assembly.

[0058] Furthermore, a connecting cavity is provided within the support element 330, and both the first and second pole tabs are positioned within the connecting cavity, extending through the support element 330 in a first direction. Neither the first and second pole tabs need to be bent; they are generally sheet-like structures, and they are in surface-to-surface contact and fixedly connected, eliminating the need for bending the first and second pole tabs and saving the space occupied by the first and second pole tabs, thereby reducing the volume of the pole assembly. In this embodiment, the sheet-like first and second pole tabs are fixedly connected using horizontal welding, further reducing the resistance between the first pole assembly 100 and the second pole assembly 200, thereby reducing the internal resistance of the pole assembly.

[0059] Optionally, a plurality of first air holes 331 are provided on the side wall of the connecting cavity. When high-pressure gas is generated inside the first pole group 100 and / or the second pole group 200, the high-pressure gas enters the connecting cavity along with the first pole ear and / or the second pole ear, and then passes through the first air holes 331 to the gap between the pole group assembly and the inner wall of the shell 10, and finally is discharged from the explosion-proof valve 11 on the shell 10.

[0060] Optionally, a second air vent 332 is provided on the side plate 310, and the second air vent 332 is connected to the connecting cavity. When high-pressure gas is generated inside the first pole group 100 and / or the second pole group 200, the high-pressure gas enters the connecting cavity along the first pole ear and / or the second pole ear, and then passes through the second air vent 332 to the gap between the pole group assembly and the inner wall of the shell 10, and finally is discharged from the explosion-proof valve 11 on the shell 10.

[0061] The supporting element 330 is an element with insulating properties, such as an injection molded part.

[0062] The electrode assembly provided in this embodiment has two supporting elements 330 of the protective frame 300 relatively inserted in the gap between the first electrode group 100 and the second electrode group 200, so that the first electrode tab and the second electrode tab are inserted in the connection cavity of the two supporting elements 330, the first end plate 341 is in contact with the push surface of the first electrode group 100, and the two ends of the first end plate 341 are fixedly connected to the side plate 310; the second end plate 342 is clamped on the side plate 310 (the limit buckle of the side plate 310 is in contact with the inner wall of the clamping groove and the side of the second end plate 342 facing away from the second electrode group 200), so that ...1 is in contact with the push surface of the first electrode group 100, and the two ends of the first end plate 341 are fixedly connected to the side plate 310). The end plate 342 is fitted with the pushing surface of the second pole group 200 to realize the assembly of the protective frame 300 with the first pole group 100 and the second pole group 200. When the second end plate 342 needs to be disassembled, the limit buckle is moved in the direction away from the pushing surface to remove the second end plate 342, and then the two side plates 310 are respectively bent outward along the second direction to remove the two supporting elements 330 from the gap between the first pole group 100 and the second pole group 200. It can be seen that the pole group assembly provided in this embodiment has a simple structure and is easy to disassemble and assemble, which is conducive to improving production efficiency and reducing production difficulty.

[0063] This embodiment also provides a battery cell having high energy density, low production difficulty and high yield.

[0064] Specific as Figure 6 As shown, the battery cell includes a housing 10, a cover plate assembly 20, and the aforementioned electrode group assembly. The electrode group assembly is located within the housing 10, and the cover plate assembly 20 is provided to cover the opening of the housing 10. The battery cell utilizes the aforementioned electrode group assembly, with a first electrode group 100 and a second electrode group 200 disposed within the housing 10. Compared to battery cells with only one electrode group, the battery cell provided in this embodiment has a higher energy density and lower production difficulty. Furthermore, side panels 310 are provided on the outer walls of the first and second electrode groups 100, 200. When the electrode group assembly is installed in the housing 10, the first and second electrode groups 100, 200 are less likely to be scratched by the housing 10. Furthermore, reinforcement members 320 are provided on the side panels 310, increasing the structural strength of the side panels 310, preventing deformation of the side panels 310, and enhancing the protection and support provided by the protective frame 300 to the first and second electrode groups 100, 200. This, in turn, increases the structural strength of the electrode group assembly and further improves the yield rate of the battery cell.

[0065] Alternatively, as Figure 7As shown, two explosion-proof valves 11 are provided on the shell 10, and one explosion-proof valve 11 is located in the middle position of the first pole group 100, and the other explosion-proof valve 11 is located in the middle position of the second pole group 200. Compared with setting the explosion-proof valve 11 on the cover assembly 20, the technical solution provided in this embodiment is conducive to shortening the flow path of the high-pressure gas. When the high-pressure gas discharged from the second air vent 332 flows to the middle position of the first pole group 100 and / or the middle position of the second pole group 200, it can be discharged from the shell 10 from the explosion-proof valve 11, achieving the effect of rapid exhaust, thereby improving the safety of the battery cell.

[0066] Furthermore, an explosion-proof hole is provided on the shell 10, and a protective sticker is provided on the inner wall of the shell 10, and the protective sticker is attached to the edge of the explosion-proof hole, and the explosion-proof valve 11 is installed on the hole wall of the explosion-proof hole. The protective sticker can protect the explosion-proof valve 11 and prevent the internal components of the shell 10 from colliding with the explosion-proof valve 11.

[0067] A first slit along a first direction is provided in the middle of the protective sticker.

[0068] like Figure 8 and Figure 9 As shown, the battery cell further includes an insulating film 30 , which is wrapped around the outside of the electrode assembly and located inside the shell 10 to provide insulation.

[0069] Furthermore, a second slit 31 is provided on the insulating film 30 , and the second slit 31 corresponds to the position of the first slit and the explosion-proof valve 11 , so that the high-pressure gas inside the electrode assembly can break through the first slit and the second slit 31 and quickly reach the explosion-proof valve 11 .

[0070] Continue as Figure 6 and Figure 10 As shown, the cover plate assembly 20 includes a first cover plate 21, which is made of a material with conductive properties such as a bare aluminum plate. The first cover plate 21 covers an opening of the battery shell along the first direction. The first cover plate 21 is welded to the third electrode tab at the end of the first electrode group 100 on one side facing the first electrode group 100, so that the electrode group assembly is electrically connected to the first cover plate 21 through the third electrode tab. In addition, since the first end plate 341 is an insulating member, the first end plate 341 can prevent the first cover plate 21 and the electrode group assembly from short-circuiting.

[0071] like Figure 6 and Figure 11As shown, the cover plate assembly 20 also includes a second cover plate 22, which is made of a material with conductive properties such as a bare aluminum plate. The second cover plate 22 is arranged to cover another opening of the battery shell along the first direction. The second cover plate 22 is welded to the fourth pole ear at the end of the second pole group 200 on one side facing the second pole group 200, so that the pole group assembly is electrically connected to the second cover plate 22 through the fourth pole ear. In addition, since the second end plate 342 is an insulating member, the second end plate 342 can prevent the second cover plate 22 and the pole group assembly from short-circuiting.

[0072] Furthermore, a boss is provided on the side of the second cover plate 22 facing away from the electrode group assembly, and the boss is used to connect to other conductive elements outside the battery cell. This structural design can simplify the overall structure of the second cover plate 22, eliminating conventional cover plate parts such as the pole, upper plastic and lower plastic, thereby improving space utilization and reducing production costs.

[0073] In this embodiment, the first cover plate 21 is a negative electrode cover plate, and the second cover plate 22 is a positive electrode cover plate.

[0074] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A pole group assembly, characterized in that: include: A first pole group (100) and a second pole group (200), wherein the first pole group (100) and the second pole group (200) are arranged along a first direction, a first pole lug is extended from one end of the first pole group (100) toward the second pole group (200), and a second pole lug is extended from one end of the second pole group (200) toward the first pole group (100), and the first pole lug is conductively connected to the second pole lug; A protective frame (300), the protective frame (300) comprising a side plate (310) and a reinforcement member (320), the side plate (310) being located at the end side of the first pole group (100) and the second pole group (200) along the second direction, the side plate (310) extending from the outer wall of the first pole group (100) to the outer wall of the second pole group (200) along the first direction, and the reinforcement member (320) being located on a side of the side plate (310) away from the first pole group (100) and the second pole group (200) along the second direction; The first direction is the length direction of the first pole group (100) and the second pole group (200), and the second direction is the width direction of the first pole group (100) and the second pole group (200).

2. The pole group assembly according to claim 1, characterized in that: The reinforcement (320) includes a raised support rib, and the raised support rib extends along the first direction.

3. The pole group assembly according to claim 2, characterized in that: The number of the raised support ribs is two, and the two raised support ribs are respectively located at the side edges of the support frame ends of the side plate (310).

4. The pole group assembly according to claim 1, characterized in that: The protective frame (300) further includes an end plate, the end plate being located at one end of the first pole group (100) facing away from the second pole group (200) or one end of the second pole group (200) facing away from the first pole group (100), and the end plate being connected to the side plate (310).

5. The pole group assembly according to claim 4, characterized in that: The number of the side plates (310) and the number of the end plates are both two, and the two side plates (310) and the two end plates are connected end to end and arranged around the periphery of the first pole group (100) and the second pole group (200).

6. The pole group assembly according to claim 1, characterized in that: The protective frame (300) further includes a supporting element (330), wherein the supporting element (330) is connected to a side of the side plate (310) close to the first pole group (100) and the second pole group (200), and is sandwiched between the first pole group (100) and the second pole group (200), and the first pole lug and the second pole lug are both located within the supporting element (330).

7. The pole group assembly according to claim 6, characterized in that: A connecting cavity is provided in the supporting element (330), and the first pole tab and the second pole tab are both arranged along the first direction through the supporting element (330) and are located in the connecting cavity.

8. The pole group assembly according to claim 7, characterized in that: A plurality of first air holes (331) are provided on the side wall of the connecting cavity.

9. A battery cell, characterized in that It comprises a shell (10), a cover plate assembly (20) and a pole group assembly according to any one of claims 1 to 8, wherein the pole group assembly is located in the shell (10), and the cover plate assembly (20) is arranged to cover the opening of the shell (10).

10. The battery cell according to claim 9, characterized in that The battery cell further comprises an insulating film (30), which is wrapped around the outside of the electrode group assembly and is located inside the housing (10).

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