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. The pole group assembly comprises a first pole group, a second pole group, a protective side plate and a supporting partition plate. The first pole group is provided with a first groove, and a first tab extends out of the first groove; the second pole group is provided with a second groove, and a second tab extends out of the second groove. The protection side plate extends from the outer wall of the first pole group to the outer wall of the second pole group. The supporting partition plates comprise partition plates and partition frame bodies, the outer walls of the partition frame bodies abut against the inner walls of the first grooves and the inner walls of the second grooves, and the two partition plates abut against the inner walls of the protection side plates correspondingly. Openings are formed in two ends of the isolation frame body, and the first tab and the second tab are conductively connected in the isolation frame body. The pole group assembly is low in production difficulty and high in energy density; the structural strength is high, and the yield is high. The battery monomer comprises a battery shell, a cover plate assembly and the pole group assembly, the pole group assembly is arranged in the battery shell, the cover plate assembly covers the opening of the battery shell, the production difficulty is low, and the energy density is high.

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 matures, it is widely used as a power battery in electric vehicles and energy storage. Currently, with the increasing demand for power battery energy density and safety, the use and development of longer power batteries is gaining increasing attention. However, increasing the length of a power battery requires increasing the length of the battery case and electrode assembly. If the electrode assembly is too long, there is a risk of bending and deformation during installation, as well as damage from the battery case. This increases the difficulty of battery production and reduces the battery yield rate.

[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, which has low production difficulty and high energy density; when the pole group assembly is installed in a battery shell, the first pole group and the second pole group are less likely to be scratched, have high structural strength and stability, and thus have a high yield rate of the pole group assembly.

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

[0006] Electrode assembly, including:

[0007] a first pole group and a second pole group, the first pole group and the second pole group being arranged along a first direction, the first direction being the length direction of the first pole group and the second pole group, a first groove being provided at one end of the first pole group facing the second pole group, a second groove being provided at one end of the second pole group facing the first pole group, a sandwich cavity being formed between the first pole group and the second pole group, a first pole lug extending from the first groove, and a second pole lug extending from the second groove;

[0008] two sets of protective side plates, the two sets of protective side plates being respectively located on opposite sides of the first pole group and the second pole group along a second direction, the second direction being the width direction of the first pole group and the second pole group, the protective side plates extending along the first direction from an outer wall of the first pole group to an outer wall of the second pole group;

[0009] A support partition is located in the clamping cavity, and the support partition includes two isolation plates and an isolation frame. The two isolation plates are located at both ends of the isolation frame. The outer wall of the isolation frame abuts against the inner wall of the first groove and the inner wall of the second groove. The two isolation plates respectively abut against the inner walls of the protective side plates on the corresponding sides. The isolation frame is provided with openings at both ends along the third direction, and the third direction is the thickness direction of the first pole group and the second pole group. The first pole ear and the second pole ear are conductively connected within the isolation frame.

[0010] Optionally, a guide groove is provided on the inner wall of the protective side plate, and the guide groove extends along the third direction, and the isolation plate can be clamped in the guide groove.

[0011] Optionally, two opposite side walls of the isolation frame are provided with slits, and the first electrode tab and the second electrode tab respectively penetrate into the isolation frame through the corresponding slits along the first direction.

[0012] Optionally, the supporting partition further includes a first protective sticker and a second protective sticker, and the first protective sticker and the second protective sticker are respectively attached to the two openings of the isolation frame.

[0013] Optionally, a first rib is provided on a side of the protective side plate away from the first pole group and the second pole group. The first rib extends along the first direction and is located in the middle of the protective side plate along the third direction.

[0014] Optionally, the pole group assembly further includes a first end plate, which is located on a side of the first pole group away from the second pole group, and two ends of the first end plate are respectively fixedly connected to the two groups of protective side plates.

[0015] Optionally, the pole group assembly further includes a second end plate, which is located on a side of the second pole group away from the first pole group, and two ends of the second end plate are respectively connected to the two groups of protective side plates.

[0016] Optionally, a slit is provided in the middle of the second end plate along the second direction, and the slit divides the second end plate into two.

[0017] Optionally, two second ribs are provided on a side of the second end plate facing away from the second pole group, and the two second ribs are spaced apart along the third direction.

[0018] A second object of the present invention is to provide a battery cell that has low production difficulty, high energy density, and high yield.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] A battery cell comprises a battery shell, a cover plate assembly and the above-mentioned electrode group assembly, wherein the electrode group assembly is arranged in the battery shell, and the cover plate assembly is covered at the opening of the battery shell.

[0021] Beneficial effects of the utility model:

[0022] The electrode assembly provided in this embodiment includes a first electrode group, a second electrode group, a protective side plate, and a support partition. On the one hand, in actual production, a first electrode group and a second electrode group of shorter length can be produced and arranged into a longer electrode group along their length direction, which can reduce the difficulty of producing the electrode group assembly while improving the energy density of the electrode group assembly; secondly, the first electrode group and the second electrode group are respectively provided with a first groove and a second groove, and the first electrode tab and the second electrode tab are respectively located in the first groove and the second groove, which can not only save the volume of the electrode group assembly but also protect the first electrode tab and the second electrode tab. On the other hand, the protective side plate is located on the outer walls of the first electrode group and the second electrode group, thereby protecting the first electrode group and the second electrode group. When the electrode group assembly is installed in the battery shell, the probability of the outer walls of the first electrode group and the second electrode group being scratched by the battery shell is reduced, which has the effect of improving the yield rate of the battery cell. On the other hand, the support partition is located in the clamping cavity formed by the first pole group and the second pole group, which can isolate and insulate the first pole group and the second pole group; secondly, the support partition includes two isolation plates and an isolation frame, and the outer wall of the isolation frame abuts against the inner wall of the first groove and the inner wall of the second groove, which can not only fix and protect the first pole group and the second pole group and increase the structural stability of the pole group assembly, but also balance the thrust when the pole group assembly is installed in the battery shell, thereby improving the structural stability of the pole group assembly; thirdly, the first pole ear and the second pole ear are conductively connected in the isolation frame, which can further protect the first pole ear and the second pole ear; and the isolation frame is provided with an opening, which is convenient for manual welding of the first pole ear and the second pole ear in the through-groove from the through-groove opening, thereby further reducing the production difficulty of the pole group assembly. 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 This is a schematic structural diagram of the first pole group (second pole group) of the pole group assembly provided by an embodiment of the present utility model;

[0025] Figure 3 This is a schematic structural diagram of the electrode group assembly provided by an embodiment of the present invention, excluding the second electrode group;

[0026] Figure 4 This is a schematic structural diagram of a protective side plate of a pole group assembly provided by an embodiment of the present utility model;

[0027] Figure 5 yes Figure 1 Enlarged view at point A;

[0028] Figure 6 yes Figure 4 Enlarged view at point B;

[0029] Figure 7 This is an assembly diagram of the protective side plate, the first end plate, and the second end plate of the pole group assembly provided by an embodiment of the present utility model;

[0030] Figure 8 yes Figure 7 Enlarged view at point C;

[0031] Figure 9 yes Figure 7 Enlarged view at D;

[0032] Figure 10 This is a schematic diagram of the structure of the support partition of the electrode assembly provided by the embodiment of the utility model Figure 1 ;

[0033] Figure 11 This is a schematic diagram of the structure of the support partition of the electrode assembly provided by the embodiment of the utility model Figure 2 ;

[0034] Figure 12 This is an exploded view of a battery cell provided by an embodiment of the present utility model;

[0035] Figure 13 It is a structural schematic diagram of the cover body of the battery cell provided by an embodiment of the present utility model.

[0036] In the picture:

[0037] 100, first pole group; 110, first groove; 120, first pole tab; 200, second pole group; 210, second groove; 220, second pole tab; 300, protective side plate; 310, first rib; 320, guide groove; 400, supporting partition; 410, isolation plate; 420, isolation frame; 430, first protective sticker; 440, slit; 500, first end plate; 600, second end plate; 610, second rib;

[0038] 10. Battery shell; 20. Cover plate body; 21. Boss; 22. Explosion-proof hole; 30. Insulation film. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. 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.

[0040] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," 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.

[0041] 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.

[0042] 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.

[0043] The electrode assembly provided in this embodiment has low production difficulty and high energy density; when the electrode assembly is installed in the battery shell, the first electrode group and the second electrode group are less likely to be scratched, have high structural strength and stability, and thus have a high yield rate of the electrode assembly.

[0044] Specific as Figures 1 to 11As shown, the electrode assembly includes a first electrode assembly 100, a second electrode assembly 200, a protective side plate 300, and a support partition 400. The first electrode assembly 100 and the second electrode assembly 200 are arranged along a first direction, which is the length direction of the first electrode assembly 100 and the second electrode assembly 200 (the x direction in the figure). A first groove 110 is provided at one end of the first electrode assembly 100 facing the second electrode assembly 200, and a second groove 210 is provided at the end of the second electrode assembly 200 facing the first electrode assembly 100, forming a sandwich cavity between the first electrode assembly 100 and the second electrode assembly 200. A first electrode tab 120 extends from the first groove 110, and a second electrode tab 220 extends from the second groove 210. Two sets of protective side plates 300 are located on opposite sides of the first and second electrode groups 100 and 200, respectively, along a second direction, which is the width of the first and second electrode groups 100 and 200 (the y-direction in the figure). The protective side plates 300 extend along the first direction from the outer wall of the first electrode group 100 to the outer wall of the second electrode group 200. A support spacer 400 is located in the interposition cavity and comprises two isolation plates 410 and an isolation frame 420. The two isolation plates 410 are located at opposite ends of the isolation frame 420. The outer walls of the isolation frame 420 abut against the inner walls of the first and second grooves 110 and 210, respectively. The two isolation plates 410 abut against the inner walls of the protective side plates 300 on their corresponding sides. The isolation frame 420 has openings at both ends along a third direction, which is the thickness direction of the first and second electrode groups 100 and 200 (the z-direction in the figure). The first and second electrode tabs 120 and 220 are electrically connected within the isolation frame 420.

[0045] Based on the above design, on the one hand, in actual production, shorter first and second electrode groups 100 and 200 can be produced and arranged along their lengths to form longer electrode groups, thereby reducing the difficulty of producing the electrode group assembly while improving the energy density of the electrode group assembly. Secondly, the first and second electrode groups 100 and 200 are respectively provided with first and second grooves 110 and 210, and the first and second electrode tabs 120 and 220 are respectively located in the first and second grooves 110 and 210, which not only saves the volume of the electrode group assembly but also protects the first and second electrode tabs 120 and 220. On the other hand, the protective side plates 300 are located on the outer walls of the first and second electrode groups 100 and 200, thereby protecting the first and second electrode groups 100 and 200. When the electrode group assembly is installed in the battery case 10, the chance of the outer walls of the first and second electrode groups 100 and 200 being scratched by the battery case 10 is reduced, thereby improving the yield rate of the battery cells. On the other hand, the support partition 400 is located in the clamping cavity formed by the first pole group 100 and the second pole group 200, which can isolate and insulate the first pole group 100 and the second pole group 200; secondly, the support partition 400 includes two isolation plates 410 and an isolation frame 420, and the outer wall of the isolation frame 420 abuts against the inner wall of the first groove 110 and the inner wall of the second groove 210, which can not only fix and protect the first pole group 100 and the second pole group 200, increase the structural stability of the pole group assembly, but also balance the thrust when the pole group assembly is installed in the battery shell 10, thereby improving the structural stability of the pole group assembly; thirdly, the first pole ear 120 and the second pole ear 220 are conductively connected in the isolation frame 420, which can further protect the first pole ear 120 and the second pole ear 220; and the isolation frame 420 is provided with an opening, which is convenient for manual welding of the first pole ear 120 and the second pole ear 220 in the through-groove from the through-groove opening, further reducing the production difficulty of the pole group assembly.

[0046] In this embodiment, the protective side plate 300 is made by injection molding, which is a common production process in this field and can also make the protective side plate 300 have better insulation properties.

[0047] Continue as Figure 4 and Figure 5 As shown, in order to increase the structural strength of the protective side plate 300, a first rib 310 is provided on the side of the protective side plate 300 away from the first pole group 100 and the second pole group 200. The first rib 310 extends along the first direction and is located in the middle of the protective side plate 300 along the third direction.

[0048] The first rib 310 may extend continuously along the first direction, or may be arranged intermittently along the first direction.

[0049] Optionally, the supporting partition 400 is detachably connected to the protective side panel 300 to facilitate disassembly of the supporting partition 400 .

[0050] Further, continue as Figure 7 and Figure 8 In order to support the guided installation of the partition 400, a guide groove 320 is provided on the inner wall of the protective side plate 300. The guide groove 320 extends along the third direction, and the isolation plate 410 can be clamped in the guide groove 320.

[0051] Continue as Figure 10 and Figure 11 As shown, slits 440 are provided on two opposite side walls of the isolation frame 420, and the first pole ear 120 and the second pole ear 220 respectively penetrate into the isolation frame 420 through the corresponding slits 440 along the first direction, so that the first pole ear 120 and the second pole ear 220 do not need to be bent. The two pole ears are roughly sheet-like structures, and the two pole ears are in surface contact and fixedly connected, eliminating the process of bending the first pole ear 120 and the second pole ear 220, and also saving the space occupied by the first pole ear 120 and the second pole ear 220, further achieving the effect of reducing the volume of the pole group component.

[0052] Optionally, the inner width H of the isolation frame 420 along the first direction ranges from 5 mm to 8 mm. For example, H can be 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, or 7.5 mm.

[0053] In this embodiment, the sheet-shaped first pole tab 120 and the sheet-shaped second pole tab 220 are fixedly connected by horizontal welding, eliminating the need for conductive connectors such as copper busbars between the first pole tab 120 and the second pole tab 220. This not only reduces the weight of the pole group assembly, but also further reduces the resistance between the first pole group 100 and the second pole group 200, thereby reducing the internal resistance of the pole group assembly.

[0054] Furthermore, the support partition 400 also includes a first protective sticker 430 and a second protective sticker, which are respectively attached to the two openings of the isolation frame 420 to seal the welded first and second pole ears 120 and 220 in the isolation frame 420.

[0055] like Figure 7 As shown, the pole group assembly further includes a first end plate 500, which is located on the side of the first pole group 100 away from the second pole group 200, and the two ends of the first end plate 500 are respectively fixedly connected to the two sets of protective side plates 300, and are surrounded by the protective side plates 300 to form a frame to further protect the first pole group 100.

[0056] In this embodiment, the first end plate 500 and the protective side plate 300 are integrally formed, which reduces the number of parts, simplifies the assembly process, and facilitates installation.

[0057] Further, continue as Figure 7 and Figure 9The electrode group assembly also includes a second end plate 600, which is located on the side of the second electrode group 200 away from the first electrode group 100, and the two ends of the second end plate 600 are respectively connected to the two sets of protective side plates 300, and are surrounded by the protective side plates 300 to form a frame to further protect the second electrode group 200. The two sets of protective side plates 300, the first end plate 500 and the second end plate 600 are roughly in the shape of a U.S. word. Whether the electrode group assembly is pushed from the side of the first electrode group 100 to be loaded into the battery shell 10 in the first direction, or the electrode group assembly is pushed from the side of the second electrode group 200 to be loaded into the battery shell 10 in the first direction, the outer walls of the first electrode group 100 and the second electrode group 200 can be protected at the same time; at the same time, it can ensure that the two sets of protective side plates 300, the first end plate 500 and the second end plate 600 of the electrode group assembly are surrounded to form an annular exhaust channel.

[0058] Optionally, continue as Figure 5 and Figure 6 Two second ribs 610 are provided on the side of the second end plate 600 away from the second pole group 200 . The two second ribs 610 are spaced apart along the third direction to increase the structural strength of the second end plate 600 .

[0059] Furthermore, the height L of the second rib 610 protruding away from the surface of the second end plate 600 along the first direction is 0.5 mm to 1.5 mm. For example, L can be 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, or 1.4 mm.

[0060] Optionally, the distance F between the two second ribs 610 is greater than 8 mm. For example, F can be 9 mm, 10 mm, 11 mm, 12 mm, etc.

[0061] Furthermore, a slit is provided in the middle of the second end plate 600 along the second direction, dividing the second end plate 600 into two. When both ends of the second end plate 600 are fixedly connected to the protective side plates 300, especially when the second end plate 600 and the protective side plates 300 are integrally formed, the second end plate 600 can be bent outward at the slit to facilitate installation of the second electrode assembly 200.

[0062] It should be noted that the first end plate 500 and the second end plate 600 are insulating members, and therefore, the first end plate 500 and the second end plate 600 can prevent the short circuit problem between the cover plate body 20 and the electrode assembly.

[0063] In this embodiment, the first end plate 500 and the first electrode group 100 and the second end plate 600 and the second electrode group 200 can be fixed together by means of adhesion, hot melting, or the like.

[0064] In the actual production of the electrode assembly, the two sets of protective side plates 300 and the two halves of the first end plate 500 and the second end plate 600 are all integrally formed. The first electrode group 100 is placed in the enclosed space between the protective side plates 300 and the first end plate 500 from the third direction side, so that the first electrode group 100 is arranged along the first direction and the first groove 110 is arranged away from the first end plate 500; then the two sets of protective side plates 300 are gently moved outward along the second direction, and the supporting partition 400 is placed between the two sets of protective side plates 300. After the first electrode ear 120 passes through the slit 440 and is located in the isolation frame 420, the isolation plate 410 of the supporting partition 400 is clamped. Set to the guide groove 320; then gently bend the two halves of the second end plate 600 outward along the second direction again, and place the second pole group 200 from the two half openings of the second end plate 600 into the enclosed space of the two sets of protective side plates 300 and the support partition 400, so that the second pole ear 220 passes through the slit 440 and is located in the isolation frame 420 and overlapped on the first pole ear 120, release the external force, and the isolation plate 410 is clamped into the guide groove 320 again; weld the first pole ear 120 and the second pole ear 220 at the opening of the isolation frame 420. After welding, stick the first protective sticker 430 and the second protective sticker to the two openings of the isolation frame 420 respectively.

[0065] This embodiment also provides a battery cell with low production difficulty, high energy density and high yield rate.

[0066] Specific as Figure 12 As shown, the battery cell includes a battery case 10, a cover plate assembly, and the aforementioned electrode group assembly. The electrode group assembly is disposed within the battery case 10, and the cover plate assembly covers the opening of the battery case 10. Compared to batteries with a longer electrode group in the prior art, the electrode group assembly of this battery cell includes a shorter first electrode group 100 and a shorter second electrode group 200, which not only increases energy density but also reduces the difficulty of electrode group assembly production. Furthermore, the first electrode group 100 and the second electrode group 200 are respectively provided with a first groove 110 and a second groove 210, and the first electrode tab 120 and the second electrode tab 220 are respectively located in the first groove 110 and the second groove 210, which not only saves volume of the electrode group assembly but also protects the first electrode tab 120 and the second electrode tab 220. On the other hand, since the electrode group assembly includes a protective side plate 300 and a supporting partition 400, when the electrode group assembly is installed in the battery shell 10, the protective side plate 300 reduces the probability of the outer walls of the first electrode group 100 and the second electrode group 200 being scratched by the battery shell 10; the supporting partition 400 supports and isolates the first electrode group 100 and the second electrode group 200 and maintains thrust balance, preventing the first electrode group 100 and the second electrode group 200 from deforming, which has the effect of improving the yield rate of the battery cell; the isolation frame 420 of the supporting partition 400 is provided with an opening to facilitate the connection of the first electrode ear 120 and the second electrode ear 220, further reducing the production difficulty of the electrode group assembly, and then reducing the production difficulty of the battery cell.

[0067] like Figure 13 As shown, the cover plate assembly includes two cover plate bodies 20, which are made of a material with conductive properties such as a bare aluminum plate. The two cover plate bodies 20 are respectively covered at the two openings of the battery shell 10 along the first direction. The cover plate body 20 located on the side of the first pole group 100 is welded to the third pole ear at the end of the first pole group 100 (located on the side of the first pole group 100 away from the first pole ear 120, not shown in the figure) toward the side of the first pole group 100; the cover plate body 20 located on the side of the second pole group 200 is welded to the fourth pole ear at the end of the second pole group 200 (located on the side of the second pole group 200 away from the second pole ear 220, not shown in the figure), so that the pole group assembly is directly electrically connected to the two cover plate bodies 20 through the third pole ear and the fourth pole ear, reducing the number of structures, reducing the internal resistance of the pole group assembly, and saving costs.

[0068] Furthermore, a boss 21 is provided on the side of the cover body 20 facing away from the electrode group assembly. The boss 21 is used to connect to other conductive elements outside the battery cell. This structural design can simplify the overall structure of the cover body 20, eliminating conventional cover parts such as poles, upper plastic and lower plastic, thereby improving space utilization and reducing production costs.

[0069] Optionally, the battery cell further includes an explosion-proof valve, and the explosion-proof valve cover is disposed on the explosion-proof hole 22 opened on the cover plate body 20 .

[0070] As shown in the figure, the battery cell further includes an insulating film 30 , which is wrapped around the outside of the electrode group assembly to improve the insulation protection capability of the electrode group assembly.

[0071] 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, wherein the first direction is the length direction of the first pole group (100) and the second pole group (200); a first groove (110) is provided on one end of the first pole group (100) facing the second pole group (200); a second groove (210) is provided on one end of the second pole group (200) facing the first pole group (100); a sandwich cavity is formed between the first pole group (100) and the second pole group (200); a first pole lug (120) extends from the first groove (110); and a second pole lug (220) extends from the second groove (210); Two groups of protective side plates (300), the two groups of protective side plates (300) are respectively located on opposite sides of the first pole group (100) and the second pole group (200) along a second direction, the second direction being the width direction of the first pole group (100) and the second pole group (200), and the protective side plates (300) extend from the outer wall of the first pole group (100) to the outer wall of the second pole group (200) along the first direction; A support partition (400) is provided, wherein the support partition (400) is located in the clamping cavity, and the support partition (400) includes two isolation plates (410) and an isolation frame (420). The two isolation plates (410) are located at both ends of the isolation frame (420), and the outer wall of the isolation frame (420) abuts against the inner wall of the first groove (110) and the inner wall of the second groove (210). The two isolation plates (410) respectively abut against the inner wall of the protective side plate (300) on the corresponding side. The isolation frame (420) is provided with openings at both ends along a third direction, and the third direction is the thickness direction of the first pole group (100) and the second pole group (200). The first pole ear (120) and the second pole ear (220) are conductively connected in the isolation frame (420).

2. The pole group assembly according to claim 1, characterized in that: The inner wall of the protective side plate (300) is provided with a guide groove (320), the guide groove (320) extends along the third direction, and the isolation plate (410) can be clamped in the guide groove (320).

3. The pole group assembly according to claim 1, characterized in that: Slits (440) are provided on two opposite side walls of the isolation frame (420), and the first pole tab (120) and the second pole tab (220) respectively penetrate into the isolation frame (420) through the corresponding slits (440) along the first direction.

4. The pole group assembly according to claim 3, characterized in that: The supporting partition (400) further comprises a first protective sticker (430) and a second protective sticker, wherein the first protective sticker (430) and the second protective sticker are respectively attached to the two openings of the isolation frame (420).

5. The pole group assembly according to claim 1, characterized in that: A first rib (310) is provided on the side of the protective side plate (300) facing away from the first pole group (100) and the second pole group (200); the first rib (310) extends along the first direction and is located in the middle of the protective side plate (300) along the third direction.

6. The pole group assembly according to claim 1, characterized in that: The pole group assembly further comprises a first end plate (500), the first end plate (500) being located on a side of the first pole group (100) facing away from the second pole group (200), and two ends of the first end plate (500) being fixedly connected to the two sets of protective side plates (300) respectively.

7. The pole group assembly according to claim 6, characterized in that: The pole group assembly further comprises a second end plate (600), the second end plate (600) being located on a side of the second pole group (200) facing away from the first pole group (100), and two ends of the second end plate (600) being respectively connected to the two sets of protective side plates (300).

8. The pole group assembly according to claim 7, characterized in that: The second end plate (600) is provided with a slit in the middle portion along the second direction, and the slit divides the second end plate (600) into two.

9. The pole group assembly according to claim 7, characterized in that: Two second convex ribs (610) are provided on a side of the second end plate (600) facing away from the second pole group (200), and the two second convex ribs (610) are arranged at intervals along the third direction.

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

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