Pole group assembly and battery cell

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 at least two pole groups, the at least two pole groups are arranged along the length direction of the pole groups and are in conductive connection, a gap is reserved between every two adjacent pole groups, every two adjacent pole groups correspond to at least one group of side plate assemblies, and the side plate assemblies are arranged on the side plate assemblies. The side plate assembly comprises two side plates, the two side plates correspond to one of the two adjacent pole groups respectively, each side plate comprises a first plate body and a second plate body which are connected, the first plate body is located on the outer wall of the corresponding pole group, and the second plate body is located at the end, facing the gap, of the corresponding pole group; the two second plate bodies in the same side plate assembly are attached to each other or abut against each other, the pole group assembly is long, and when the pole group assembly is installed in a battery shell, the probability that a pole group is scratched by the battery shell and the probability that the pole group is bent and deformed are low.

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.

[0003] The cores of existing lithium-ion batteries are generally short. Extending the core length can increase the battery's energy density, but this can reduce the yield rate of the battery product. Specifically, when installing the core into the battery case, the core is gradually pushed into the battery case from the opening at one end of the battery case in the length direction. Since battery cases are mostly made of metal, have thin walls, and sharp openings, and existing cores are heavy and soft, there is a risk of scratching the core when pushing it into the battery case. The longer the core, the higher the chance of scratching the core. In addition, when pushing the core into the battery case, it is necessary to overcome the large friction between the battery case and the core. If the core is extended, the middle area of the core is prone to bending and deformation, which in turn reduces the battery product yield.

[0004] Therefore, it is urgent to propose a pole group assembly and a battery cell to solve the above technical problems. Utility Model Content

[0005] The first object of the present invention is to provide a pole group assembly having a longer length and having a lower probability of being scratched by the battery shell and bending and deforming the pole group when the pole group assembly is installed in the battery shell.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Electrode assembly, including:

[0008] At least two electrode groups, at least two electrode groups are arranged along a first direction and are conductively connected, and a gap is left between each two adjacent electrode groups, and the first direction is the length direction of the electrode group;

[0009] Every two adjacent pole groups correspond to at least one set of side plate assemblies. The side plate assemblies include two side plates, and the two side plates correspond to one of the two adjacent pole groups respectively. The side plates include a first plate body and a second plate body that are connected. The first plate body is located on the outer wall of the corresponding pole group, and the second plate body is located at one end of the corresponding pole group facing the gap, and the two second plates in the same set of side plate assemblies fit or abut each other.

[0010] Optionally, along the first direction, pole lugs extend from both ends of the pole group, the pole lugs between two adjacent pole groups extend along the first direction, and the pole lugs between two adjacent pole groups are connected to form a pole lug group.

[0011] Optionally, every two adjacent pole groups correspond to two groups of side plate assemblies, and the two groups of side plate assemblies corresponding to every two adjacent pole groups are symmetrically arranged with respect to the pole lug group.

[0012] Optionally, the two groups of side plate assemblies corresponding to every two adjacent pole groups are distributed along a second direction, and the second direction is a height direction of the pole groups.

[0013] Optionally, in the same group of side panel assemblies, at least one of the two second plate bodies is provided with an exhaust structure, the exhaust structure is connected to the gap, and the axis of the exhaust structure is parallel to the second direction, and the exhaust structure is an exhaust groove and / or an exhaust hole.

[0014] Optionally, the two second plates in the same group of side plate assemblies are both provided with an exhaust groove, and the notches of the two exhaust grooves in the same group of side plate assemblies are arranged opposite to each other.

[0015] Optionally, at least two pole groups are arranged along a first direction and conductively connected to form a pole group row. In the first direction, at least one of the two opposite end faces of the pole group row is fixed with an end plate, and the positive projection of the end plate on the corresponding end face is equal to the surface area of the end face.

[0016] A second object of the present invention is to provide a battery cell having a higher energy density and a higher yield rate.

[0017] To achieve this purpose, the present invention adopts the following technical solutions:

[0018] The battery cell comprises a battery shell, a cover plate assembly and the above-mentioned electrode group assembly. The battery shell is provided with an opening, the electrode group assembly is arranged in the battery shell, and the cover plate assembly is covered at the opening.

[0019] Optionally, the number of cover plate assemblies and openings are both two and correspond one to one, at least one of the two cover plate assemblies is a first cover plate assembly, the first cover plate assembly includes a first cover plate body, the first cover plate body is a conductive member, the first cover plate body is covered at a corresponding opening, the side of the first cover plate body facing the pole group assembly is conductively connected to the pole group, and the side of the first cover plate body facing away from the pole group assembly is provided with a boss, which is used to electrically connect to an external conductive element.

[0020] Optionally, a first explosion-proof valve is provided on the battery shell, and a first explosion-proof valve is provided between each two adjacent electrode groups.

[0021] Beneficial effects of the utility model:

[0022] The electrode group assembly provided by the present invention includes at least two electrode groups arranged along the length of the electrode groups and electrically connected, with a gap remaining between each adjacent electrode group. Each adjacent electrode group corresponds to at least one set of side plate assemblies, the side plate assembly including two side plates, each corresponding to one of the two adjacent electrode groups. The side plates include a first plate body and a second plate body connected to each other, the first plate body being located on the outer wall of the corresponding electrode group, and the second plate body being located at one end of the corresponding electrode group facing the gap. The two second plates in the same set of side plate assemblies abut or abut each other, thereby increasing the overall length of the electrode group assembly and thereby facilitating an improvement in the energy density of the single battery cell. Furthermore, when the electrode group assembly is installed into a battery case along the first direction, the two second plates in the same set of side plate assemblies can exert force on each other, providing support for the corresponding two adjacent electrode groups, thereby improving the overall structural strength of the electrode group assembly, reducing the probability of bending and deformation of the electrode group, and improving the yield rate of the battery cells. On the other hand, the first plate located on the outer wall of the electrode group protects the electrode group. When the electrode group assembly is installed in the battery shell, the probability of the battery shell scratching the electrode group can be reduced, which has the effect of 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 This is a partial enlarged structural diagram of a side panel provided by an embodiment of the present utility model;

[0025] Figure 3 This is an enlarged structural diagram of the tab assembly provided by an embodiment of the present utility model;

[0026] Figure 4 This is a schematic cross-sectional view of a battery cell according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the explosion structure of a battery cell provided by an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the first cover assembly provided by the embodiment of the utility model Figure 1 ;

[0029] Figure 7 This is a schematic diagram of the structure of the first cover assembly provided by the embodiment of the utility model Figure 2 ;

[0030] Figure 8 It is a structural schematic diagram of the second cover plate assembly provided by an embodiment of the present utility model;

[0031] Figure 9It is a partially enlarged structural schematic diagram of the first explosion-proof valve provided in an embodiment of the utility model.

[0032] In the picture:

[0033] 100, electrode group; 110, electrode tab; 120, electrode tab group; 200, gap; 300, side plate assembly; 310, side plate; 311, first plate body; 312, second plate body; 3121, exhaust slot; 3122, weight reduction slot; 3123, support plate; 400, end plate; 500, insulating film;

[0034] 10. Battery case; 11. Opening; 12. First explosion-proof valve; 20. First cover assembly; 21. First cover body; 22. Boss; 23. Second explosion-proof valve; 24. Insulation tape; 30. Second cover assembly; 31. Second cover body; 32. Post; 33. Press block; 34. Upper plastic; 35. Lower plastic; 36. Third explosion-proof valve;

[0035] D1, first direction; D2, second direction; D3, third direction. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] This embodiment provides a pole group assembly having a long length. When the pole group assembly is installed in a battery shell, the probability of the pole group being scratched by the battery shell and the probability of the pole group being bent and deformed are both low.

[0041] Specifically, if Figures 1 to 4 As shown, the pole group assembly includes at least two pole groups 100, at least two pole groups 100 are arranged and conductively connected along a first direction D1, and a gap 200 is left between each adjacent two pole groups 100, and the first direction D1 is the length direction of the pole group 100; each adjacent two pole groups 100 correspond to at least one group of side plate assemblies 300, and the side plate assembly 300 includes two side plates 310, and the two side plates 310 respectively correspond to one of the two adjacent pole groups 100, and the side plates 310 include a first plate body 311 and a second plate body 312 connected to each other, the first plate body 311 is located on the outer wall of the corresponding pole group 100, and the second plate body 312 is located at one end of the corresponding pole group 100 facing the gap 200, and the two second plates 312 in the same group of side plate assemblies 300 are attached to or abutted against each other.

[0042] The electrode group assembly provided in this embodiment includes at least two electrode groups 100 arranged along the length direction of the electrode group 100 and conductively connected, a gap 200 is left between each two adjacent electrode groups 100, and each two adjacent electrode groups 100 corresponds to at least one group of side plate assemblies 300. The side plate assembly 300 includes two side plates 310, and the two side plates 310 respectively correspond to one of the two adjacent electrode groups 100. The side plates 310 include a first plate body 311 and a second plate body 312 connected to each other. The first plate body 311 is located on the outer wall of the corresponding electrode group 100, and the second plate body 312 is located at one end of the corresponding electrode group 100 facing the gap 200. The two second plates 312 in the same group of side plate assemblies 300 are fitted or abutted against each other, thereby increasing the overall length of the electrode group assembly, which is beneficial to improving the energy density of the single battery.

[0043] On the other hand, when the electrode group assembly is installed into the battery shell 10 along the first direction D1, the two second plates 312 in the same group of side plate assemblies 300 can exert force on each other, thereby supporting the corresponding two adjacent electrode groups 100, improving the overall structural strength of the electrode group assembly, reducing the probability of bending and deformation of the electrode group 100, and having the effect of improving the yield rate of battery cells.

[0044] On the other hand, the first plate 311 located on the outer wall of the electrode group 100 protects the electrode group 100. When the electrode group assembly is installed in the battery shell 10, the probability of the battery shell 10 scratching the electrode group 100 can be reduced, which has the effect of improving the yield rate of battery cells.

[0045] On the other hand, when assembling the pole group assembly, the first plate body 311 of the side plate 310 is placed on the outer wall of a pole group 100, and the second plate body 312 of the side plate 310 is fit with the side of the pole group 100 facing the gap 200 to complete the assembly of a side plate 310 and a pole group 100. Then, the two pole groups 100 are arranged along the first direction D1, and the second plates 312 on the two pole groups 100 are arranged relative to each other and fit or abutted to complete the assembly of the two pole groups 100 and a set of side plate assemblies 300. It can be seen that the structural design is simple and can realize the rapid disassembly and assembly of the pole group 100 and the side plate 310.

[0046] In this embodiment, the electrode group assembly includes two electrode groups 100. In other implementation schemes, the number of electrode groups 100 may also be three, four, or five, etc., which are not listed here one by one.

[0047] Furthermore, the first plate 311 extends along the first direction D1 to provide a better protection effect on the electrode assembly 100 .

[0048] Alternatively, as Figures 1 to 4As shown, along the first direction D1, a tab 110 extends from both ends of the electrode group 100. The tabs 110 located between two adjacent electrode groups 100 extend along the first direction D1, that is, the tabs 110 located within the gap 200 extend along the first direction D1, and the tabs 110 located between two adjacent electrode groups 100 are connected to form a tab group, thereby achieving a conductive connection between the two adjacent electrode groups 100. In this embodiment, the tabs 110 located between two adjacent electrode groups 100 extend along the first direction D1, so that the tabs 110 located within the gap 200 have a generally sheet-like structure, which can reduce the space occupied by the tabs 110 and has the effect of reducing the volume of the electrode group assembly. In addition, in actual production, the bending process of the tabs 110 is omitted, which has the effect of reducing production processes and thus improving production efficiency. In addition, the tabs 110 of two adjacent electrode groups 100 are directly connected, eliminating the need for copper busbars and other tab 110 connectors. This not only reduces the weight of the electrode group assembly, but also reduces the resistance between the two adjacent electrode groups 100, thereby reducing the internal resistance of the electrode group assembly.

[0049] Furthermore, the two tabs 110 in the tab group are fixedly connected by a horizontal welding process, which is relatively simple and helps to reduce production costs and improve production efficiency.

[0050] Alternatively, as Figures 1 to 4 As shown, every two adjacent pole groups 100 correspond to two groups of side plate assemblies 300, and the two groups of side plate assemblies 300 corresponding to every two adjacent pole groups 100 are symmetrically arranged about the pole tab group, so that two second plates 312 that fit or abut each other are provided on both sides of the pole tab group to prevent the pole tab group from bending, thereby protecting the pole tab 110.

[0051] Furthermore, the size of the tab 110 is usually large in the height direction of the pole group 100. Figures 1 to 4 As shown, the two sets of side plate assemblies 300 corresponding to each two adjacent electrode groups 100 are distributed along the second direction D2, which is the height direction of the electrode group 100, to further prevent the electrode tab group from bending. In other embodiments, the two sets of side plate assemblies 300 corresponding to each two adjacent electrode groups 100 can also be distributed along the third direction D3, which is the width direction of the electrode group 100.

[0052] Furthermore, if Figures 1 to 4As shown, the two first plates 311 of the two sets of side plate assemblies 300 corresponding to the same pole group 100 are distributed along the second direction D2, that is, one of the two first plates 311 corresponding to the pole group 100 is located on the outer top wall of the pole group 100, and the other is located on the outer bottom wall of the pole group 100, and the pole group 100 includes two large surfaces and two small surfaces that are oppositely arranged, and the above-mentioned outer top wall and outer bottom wall are respectively arranged on the two small surfaces. Of course, in other embodiments, the two first plates 311 of the two sets of side plate assemblies 300 corresponding to the same pole group 100 can also be distributed along the third direction D3, that is, the two first plates 311 corresponding to the pole group 100 are respectively located on the two outer side walls of the pole group 100.

[0053] It should be pointed out that in other embodiments, every two adjacent pole groups 100 may correspond to one, three or four groups of side plate assemblies 300. For example, several groups of side plate assemblies 300 are arranged along the second direction D2, etc., which are not listed here one by one.

[0054] Alternatively, as Figures 1 to 4 As shown, in the same group of side plate assemblies 300, at least one of the two second plates 312 is provided with an exhaust structure, the exhaust structure is connected to the gap 200, and the axis of the exhaust structure is parallel to the second direction D2, the exhaust structure is an exhaust groove 3121 and / or an exhaust hole, so that the above-mentioned gap 200 and the exhaust structure form an exhaust channel, when high-pressure gas is generated inside the electrode group 100, the high-pressure gas can be discharged from the inside of the electrode group 100 through the exhaust channel. It can be seen that this structural design achieves the effect of rapid exhaust of the electrode group 100, thereby improving the safety of the electrode group assembly.

[0055] Furthermore, if Figures 1 to 4 As shown, the two second plates 312 in the same group of side plate assemblies 300 are both provided with exhaust grooves 3121, and the notches of the two exhaust grooves 3121 in the same group of side plate assemblies 300 are arranged relative to each other. This design can expand the flow area of the exhaust channel, thereby improving the exhaust efficiency of the pole group 100.

[0056] Of course, in other embodiments, one of the second plates 312 in the same group of side plate assemblies 300 may be provided with an exhaust groove 3121; or, one or two of the second plates 312 in the same group of side plate assemblies 300 may be provided with an exhaust hole; or, one of the second plates 312 in the same group of side plate assemblies 300 may be provided with an exhaust groove 3121, and the other second plate 312 may be provided with an exhaust hole.

[0057] Alternatively, as Figures 1 to 4As shown, a weight-reducing groove 3122 is provided on the side of the second plate 312 facing the gap 200 to reduce the weight of the second plate 312 and, in turn, the weight of the electrode assembly. A support plate 3123 is provided within the weight-reducing groove 3122 to enhance the structural strength of the second plate 312. Coaxial notches are provided on the side of the support plate 3123 facing away from the bottom of the weight-reducing groove 3122 and on the two opposing sidewalls of the weight-reducing groove 3122. These three notches form an exhaust channel 3121, thereby reducing the weight of the second plate 312 while enhancing its structural strength and enabling rapid exhaust of the electrode assembly 100.

[0058] Alternatively, as Figures 1 to 4 As shown, at least two electrode groups 100 are arranged along a first direction D1 and conductively connected to form an electrode group row. In the first direction D1, at least one of the two opposite end faces of the electrode group row is fixed with an end plate 400, and the orthographic projection of the end plate 400 on the corresponding end face is equal to the surface area of the end face. In this embodiment, one end face of the electrode group row in the first direction D1 is provided with an end plate 400, and the other end face is not provided with an end plate 400. When the electrode group assembly is installed into the battery shell 10, the end face without the end plate 400 can be made to face the opening 11 of the battery shell 10, and then the end plate 400 is pushed to push the entire electrode group assembly into the battery shell 10. In the process of pushing the electrode group assembly, the entire end face of the electrode group 100 fixed to the end plate 400 is a force-bearing surface, so that the end face of the electrode group 100 can be subjected to relatively uniform force, thereby reducing the probability of wrinkling and deformation of the electrode group 100 due to uneven force on the end face of the electrode group 100 when pushing the electrode group assembly.

[0059] It should be noted that in this embodiment, an end plate 400 is provided on one end face of the electrode group arrangement in the first direction D1, while an end plate 400 is not provided on the other end face. This can reduce the overall volume of the electrode group assembly and lower production costs. In other embodiments, end plates 400 can also be provided on both end faces of the electrode group arrangement in the first direction D1.

[0060] Furthermore, the end plate 400 is an insulating member to prevent the electrode group 100 from being electrically connected to other conductive members through the end plate 400 .

[0061] Furthermore, the end plate 400 is fixedly connected to the end surface of the electrode group 100 by gluing or hot melting.

[0062] This embodiment also provides a battery cell, such as Figure 4 and Figure 5As shown, the battery cell includes a battery case 10, a cover plate assembly, and the aforementioned electrode group assembly. The battery case 10 has an opening 11, the electrode group assembly is disposed within the battery case 10, and the cover plate assembly covers the opening 11. The battery cell employs the aforementioned electrode group assembly, which is not only longer, thereby increasing the energy density of the battery cell, but also has a lower probability of bending and deformation when the electrode group assembly is installed in the battery case 10, and a lower probability of the electrode group assembly being scratched by the battery case 10, thereby resulting in a higher yield rate for the battery cell.

[0063] Alternatively, as Figures 4 to 6 As shown, the number of cover plate assemblies and openings 11 are both two and they correspond one to one. At least one of the two cover plate assemblies is a first cover plate assembly 20. The first cover plate assembly 20 includes a first cover plate body 21. The first cover plate body 21 is a conductive member such as a plain aluminum plate. The first cover plate body 21 is covered at a corresponding opening 11. The side of the first cover plate body 21 facing the pole group assembly is conductively connected to the pole group 100 through the pole ear 110. The side of the first cover plate body 21 facing away from the pole group assembly is provided with a boss 22. The boss 22 is used to electrically connect to an external conductive element (such as the boss 22 of another battery cell). This structural design can simplify the overall structure of the first cover plate assembly 20, eliminate conventional cover plate parts such as the pole column 32, the upper plastic 34 and the lower plastic 35, improve space utilization while reducing production costs.

[0064] Furthermore, if Figures 4 to 7 As shown, the first cover plate assembly 20 further includes an insulating sticker 24 , which is attached to a surface of the first cover plate body 21 facing the electrode group 100 to achieve insulation between the first cover plate body 21 and the electrode group 100 .

[0065] It should be noted that if Figures 4 to 8 As shown, in this embodiment, one of the two cover plate assemblies is the first cover plate assembly 20 described above, and the other is the second cover plate assembly 30. The second cover plate assembly 30 includes a second cover plate body 31, a pole 32, a pressing block 33, an upper plastic 34, and a lower plastic 35. The second cover plate body 31 is provided to cover a corresponding opening 11, the pole 32 is sealed and penetrated through the second cover plate body 31, and the pole 32 is connected to the pole lug 110. The pressing block 33 is connected to the side of the second cover plate body 31 facing away from the pole group 100 through the upper plastic 34, and the pressing block 33 is connected to the pole 32. The lower plastic 35 covers the side of the second cover plate body 31 facing the pole group 100. Of course, in other embodiments, both cover plate assemblies can be the first cover plate assembly 20 described above, depending on the actual application requirements.

[0066] Alternatively, as Figures 4 to 9As shown, the battery cell further includes an insulating film 500 , which is wrapped around the outside of the electrode group assembly to achieve an insulating effect between the electrode group assembly and the battery case 10 .

[0067] Alternatively, as Figures 4 to 9 As shown, the battery case 10 is provided with a first explosion-proof valve 12, one located between each pair of adjacent electrode assemblies 100, to facilitate rapid exhaust of the electrode assemblies 100. In this embodiment, the two second plates 312 of the same side plate assembly 300 are positioned between two adjacent electrode assemblies 100, and the notches of the two exhaust slots 3121 in the same side plate assembly 300 are positioned opposite each other. This allows high-pressure gas generated within the electrode assembly 100 to quickly reach the first explosion-proof valve 12 through the exhaust passage and exit the battery case 10 through the first explosion-proof valve 12.

[0068] Furthermore, the battery case 10 includes two oppositely disposed large surfaces and two oppositely disposed small surfaces, and the first explosion-proof valve 12 is located on the small surfaces.

[0069] Furthermore, if Figures 4 to 9 As shown, the length of the first explosion-proof valve 12 (the dimension in the first direction D1) is a, 10mm<a<90mm, illustratively, a can be 10mm, 15mm, 50mm, 88mm or 90mm, etc. The width of the first explosion-proof valve 12 (the dimension in the third direction D3) is b, the width of the battery shell 10 is c, and the radius of the fillet between two adjacent outer walls of the battery shell 10 is R, 7mm≤b<c-[2×(R+2)]<83mm. This size design can not only maximize the surface area of the first explosion-proof valve 12, thereby improving the exhaust efficiency, but also ensure the structural strength of the battery shell 10 located around the first explosion-proof valve 12.

[0070] Alternatively, as Figures 4 to 9 As shown, a second explosion-proof valve 23 is provided on the first cover plate body 21, and a third explosion-proof valve 36 is provided on the second cover plate body 31. The high-pressure gas inside the electrode group 100 can be discharged from the battery shell 10 through the first explosion-proof valve 12, the second explosion-proof valve 23 and the third explosion-proof valve 36. In addition, since a first installation gap is left between the electrode group assembly and the inner wall of the battery shell 10, and a second installation gap is left between the electrode group assembly and the two cover plate assemblies, the gap 200 between the two adjacent electrode groups 100, the first installation gap and the second installation gap form an annular exhaust flow channel, and explosion-proof valves capable of exhausting are provided in the middle area and both ends of the annular flow channel. It can be seen that this structural design achieves the effect of rapid exhaust of the battery monomer, which has the effect of improving the safety of battery monomer use.

[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: At least two pole groups (100), at least two of the pole groups (100) are arranged along a first direction (D1) and are conductively connected, and a gap (200) is left between each two adjacent pole groups (100), the first direction (D1) being the length direction of the pole groups (100); Each of the two adjacent pole groups (100) corresponds to at least one group of side plate assemblies (300), and the side plate assemblies (300) include two side plates (310), and the two side plates (310) respectively correspond to one of the two adjacent pole groups (100). The side plates (310) include a first plate body (311) and a second plate body (312) that are connected to each other, wherein the first plate body (311) is located on the outer wall of the corresponding pole group (100), and the second plate body (312) is located at one end of the corresponding pole group (100) facing the gap (200), and the two second plate bodies (312) in the same group of side plate assemblies (300) are in contact with or in abutment with each other.

2. The pole group assembly according to claim 1, characterized in that: Along the first direction (D1), pole lugs (110) extend from both ends of the pole group (100), the pole lugs (110) located between two adjacent pole groups (100) extend along the first direction (D1), and the pole lugs (110) located between two adjacent pole groups (100) are connected to form a pole lug group (120).

3. The pole group assembly according to claim 2, characterized in that: Every two adjacent pole groups (100) correspond to two groups of side plate assemblies (300), and the two groups of side plate assemblies (300) corresponding to every two adjacent pole groups (100) are symmetrically arranged with respect to the pole tab group (120).

4. The pole group assembly according to claim 3, characterized in that: The two groups of side plate assemblies (300) corresponding to each two adjacent pole groups (100) are distributed along a second direction (D2), and the second direction (D2) is the height direction of the pole group (100).

5. The pole group assembly according to claim 4, characterized in that: In the same group of the side panel assemblies (300), at least one of the two second plate bodies (312) is provided with an exhaust structure, the exhaust structure is connected to the gap (200), and the axis of the exhaust structure is parallel to the second direction (D2), and the exhaust structure is an exhaust groove (3121) and / or an exhaust hole.

6. The pole group assembly according to claim 5, characterized in that: The two second plates (312) in the same group of the side plate assemblies (300) are both provided with the exhaust slots (3121), and the notches of the two exhaust slots (3121) in the same group of the side plate assemblies (300) are arranged relative to each other.

7. The pole group assembly according to any one of claims 1 to 6, characterized in that: At least two of the pole groups (100) are arranged along the first direction (D1) and conductively connected to form a pole group row. In the first direction (D1), at least one of the two opposite end faces of the pole group row is fixed with an end plate (400), and the orthographic projection of the end plate (400) on the corresponding end face is equal to the surface area of the end face.

8. A battery cell, characterized in that The invention comprises a battery shell (10), a cover plate assembly and a pole group assembly according to any one of claims 1 to 7, wherein the battery shell (10) is provided with an opening (11), the pole group assembly is arranged in the battery shell (10), and the cover plate assembly is covered at the opening (11).

9. The battery cell according to claim 8, characterized in that The number of the cover plate assemblies and the openings (11) are both two and they correspond one to one. At least one of the two cover plate assemblies is a first cover plate assembly (20). The first cover plate assembly (20) includes a first cover plate body (21). The first cover plate body (21) is a conductive member. The first cover plate body (21) is covered at a corresponding opening (11). The side of the first cover plate body (21) facing the pole group assembly is conductively connected to the pole group (100). The side of the first cover plate body (21) facing away from the pole group assembly is provided with a boss (22). The boss (22) is used to be electrically connected to an external conductive element.

10. The battery cell according to claim 8, characterized in that The battery shell (10) is provided with a first explosion-proof valve (12), and each first explosion-proof valve (12) is provided between two adjacent electrode groups (100).

Images