Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a pole group assembly and a protective separator, the pole group assembly comprises a plurality of pole groups which are sequentially arranged along a first preset direction, at least one of two ends, close to each other, of any two adjacent pole groups forms an avoiding groove, and the protective separator is arranged in the avoiding groove. Tab clusters of the pole groups are arranged in the corresponding avoiding grooves; the protective separator comprises a blocking part and a protective part which are connected with each other; a blocking part is arranged between any two adjacent pole groups, a mounting passing opening is formed in each blocking part, the tab clusters of the pole groups can extend into the avoiding grooves of the adjacent pole groups through the mounting passing openings, and protection parts are arranged on the outer sides of the butt joint positions of the two pole groups and used for shielding the tab clusters of the two pole groups. The long battery cell provided by the utility model is beneficial to capacity improvement, and the whole pole group is designed into a split structure, so that the length of the pole piece of the pole group is reduced, and further, the problems of wrinkling, deformation, layer channeling or breakage and the like are not easy to occur in the pole piece production and later assembly processes.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell. Background Art

[0002] The existing battery cell structure is generally short, and the overall capacity increase space is limited by process conditions. If the length of the battery cell is increased in order to increase the capacity, and the length of the electrode group is increased, that is, the length of the electrode is increased, then wrinkles, deformation, layer crossover or breakage may easily occur during the production and subsequent assembly of the electrode, resulting in a reduction in yield. Utility Model Content

[0003] The purpose of the present application is to provide a battery cell which, to a certain extent, solves the technical problem in the prior art that increasing the capacity requires designing the battery cell to be longer, thereby increasing the length of the electrode group, that is, increasing the length of the electrode sheet, which is prone to wrinkles, deformation, layer cross-linking or breakage during the production and subsequent assembly of the electrode sheet, resulting in a reduced yield.

[0004] The present application provides a battery cell, comprising: a pole group assembly and a protective spacer; wherein the pole group assembly comprises a plurality of pole groups sequentially arranged along a first preset direction, and at least one of the two ends of any two adjacent pole groups that are close to each other is formed with an escape groove, and the pole lug clusters of the pole groups are arranged in the corresponding escape grooves;

[0005] The protective isolation member includes a blocking portion and a protective portion that are connected to each other; the blocking portion is provided between any two adjacent pole groups, the blocking portion is formed with an installation opening, and the pole ear cluster of the pole group can extend through the installation opening to the avoidance groove of the adjacent pole group; along the second preset direction, the protective portion is provided on at least one side of the relative connection between the two pole groups, and the protective portion is used to shield the pole ear clusters of the two pole groups.

[0006] In the above technical solution, further, the protective portion is connected to the blocking portion, and the protective portion can be folded relative to the blocking portion.

[0007] In any of the above technical solutions, further, the protective portion and the blocking portion are an integrated structure, and a thinning area is formed at the connection between the protective portion and the blocking portion.

[0008] In any of the above technical solutions, further, the protective portion and the blocking portion are split structures, and the two are rotatably connected via a rotating shaft.

[0009] In any of the above technical solutions, further, in the first preset direction, the protective portion is provided on both sides of the blocking portion.

[0010] In any of the above technical solutions, further, along the second preset direction, the protective parts are provided on both sides of the relative connection between the two pole groups.

[0011] In any of the above technical solutions, further, both ends of any two adjacent pole groups that are close to each other are formed with avoidance grooves.

[0012] In any of the above technical solutions, further, the battery cell further includes a supporting side plate and a supporting end plate; wherein, along the third preset direction, the supporting side plate is provided on at least one side of the electrode assembly, and the blocking portion abuts against a side portion of the supporting side plate;

[0013] Along the first preset direction, at least one end of the pole group assembly is provided with the support end plate, and the support end plate is connected to the support side plate; the support end plate is formed with a via hole.

[0014] In any of the above technical solutions, further, the support end plate and the support side plate are an integral injection-molded structure.

[0015] In any of the above technical solutions, further, a plurality of auxiliary air-guiding protrusions are formed on a side of the supporting side plate away from the pole group, and the plurality of auxiliary air-guiding protrusions are sequentially spaced along the first preset direction.

[0016] In any of the above technical solutions, further, along the third preset direction, the supporting side plates are provided on both sides of the pole group assembly; along the first preset direction, the supporting end plates are provided at both ends of the pole group assembly, and the two supporting end plates are respectively connected to the two supporting side plates to form a U-shaped frame, and at least one of the supporting end plates is formed with a cut-out passing through both sides thereof along the second preset direction, so that the supporting end plates form a two-section structure.

[0017] In any of the above technical solutions, further, one of the two ends of any two adjacent electrode groups close to each other forms a positive electrode ear cluster, and the other one forms a negative electrode ear cluster, and the positive electrode ear cluster and the negative electrode ear cluster are both arranged along the large surface side parallel to the electrode group, and the positive electrode ear cluster and the negative electrode ear cluster are stacked together and connected by welding.

[0018] In any of the above technical solutions, further, the battery cell also includes a shell and a cover; wherein, along the first preset direction, at least one end of the shell is formed with an opening, and the cover is installed at at least one opening of the shell, and the cover is formed with a conductive boss protruding toward the side away from the pole group assembly.

[0019] In any of the above technical solutions, further, the blocking portion is formed with a cutout, and is respectively connected to the installation opening and the outside along both ends of the cutout, and the pole lug cluster of the pole group can move into the installation opening through the cutout.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The present application provides a longer battery cell, which realizes the overall capacity increase, and designs the overall electrode group of the battery cell into a split structure, thereby reducing the length of a single electrode group, that is, reducing the length of the electrode piece, so that wrinkles, deformation, layer crossover or breakage are not likely to occur during the production and subsequent assembly of the electrode piece, which helps to improve the yield rate and also helps to reduce costs. In addition, a part of the structure of the protective isolation piece, that is, the blocking part, is arranged between two adjacent electrode groups, thereby insulating and separating the two electrode groups, and forming an avoidance channel for the electrode ear cluster, which can effectively prevent defects such as electrode ear crushing, and helps to improve the overall strength. Preferably, a groove is formed at the end of the electrode group, thereby playing the role of avoiding the electrode ear cluster, providing space for accommodating the electrode ear cluster to avoid interference. In addition, another part of the structure of the protective isolation piece, that is, the protective part, can block the electrode ear cluster, playing the role of insulation protection and protecting the electrode ear cluster. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 An exploded diagram of a battery cell provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the partial structure of a battery cell provided in an embodiment of the present application;

[0025] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A;

[0026] Figure 4 An assembly diagram of the supporting side panels, supporting end panels, and protective isolation members provided in an embodiment of the present application;

[0027] Figure 5 for Figure 4 A schematic diagram of the enlarged structure at B;

[0028] Figure 6 for Figure 4Schematic diagram of the enlarged structure at C;

[0029] Figure 7 for Figure 4 Schematic diagram of the enlarged structure at D;

[0030] Figure 8 An assembly diagram of the supporting side panels and supporting end panels provided in an embodiment of the present application;

[0031] Figure 9 Another assembly diagram of the supporting side plates and the supporting end plates provided in an embodiment of the present application;

[0032] Figure 10 for Figure 9 Schematic diagram of the enlarged structure at E;

[0033] Figure 11 Another assembly diagram of the supporting side plates and the supporting end plates provided in an embodiment of the present application;

[0034] Figure 12 A schematic structural diagram of a protective isolation member provided in an embodiment of the present application;

[0035] Figure 13 Another schematic structural diagram of the protective isolation member provided in an embodiment of the present application;

[0036] Figure 14 A schematic diagram of the structure of the cover plate provided in an embodiment of the present application;

[0037] Figure 15 A schematic diagram of the structure of the electrode group provided in an embodiment of the present application;

[0038] Figure 16 A schematic diagram of assembling two electrode groups provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] 1. Pole group assembly; 11. Pole group; 111. Avoidance groove; 12. Pole ear cluster; 121. Positive electrode ear cluster; 122. Negative electrode ear cluster; 2. Protective spacer; 21. Blocking part; 211. Installation opening; 212. Incision; 22. Protective part; 221. Thinning area; 3. Support side plate; 31. Auxiliary air guide protrusion; 4. Support end plate; 41. Via hole; 42. Cut-off opening; 43. Protrusion adapter; 5. Housing; 6. Cover plate; 61. Conductive boss; 7. Mylar film. DETAILED DESCRIPTION

[0041] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0042] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0043] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0044] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. 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 this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0046] Refer to the following Figures 1 to 16 The battery cell according to some embodiments of the present application is described.

[0047] See also Figures 1 to 5 、 Figure 15 、 Figure 16 As shown, an embodiment of the present application provides a battery cell, comprising: a pole group assembly 1 and a protective spacer 2; wherein the pole group assembly 1 comprises a plurality of pole groups 11 arranged sequentially along a first preset direction a, and at least one of the two ends of any two adjacent pole groups 11 that are close to each other is formed with an avoidance groove 111, and the pole lug clusters 12 of the pole groups 11 are arranged in the corresponding avoidance groove 111;

[0048] The protective isolation member 2 includes a blocking portion 21 and a protective portion 22 that are connected to each other; a blocking portion 21 is provided between any two adjacent pole groups 11, and the blocking portion 21 forms an installation opening 211, and the pole ear cluster 12 of the pole group 11 can extend into the avoidance groove 111 of the adjacent pole group 11 through the installation opening 211; along the second preset direction b, a protective portion 22 is provided on at least one side of the relative connection between the two pole groups 11, and the protective portion 22 is used to shield the pole ear clusters 12 of the two pole groups 11.

[0049] According to the structure described above, the present application provides a longer battery cell, which realizes an overall capacity increase, and designs the overall electrode group 11 of the battery cell as a split structure, thereby reducing the length of a single electrode group 11, that is, reducing the length of the electrode piece, so that wrinkles, deformation, layer crossover or breakage are not likely to occur during the production and subsequent assembly of the electrode piece, which helps to improve the yield rate and also helps to reduce costs. In addition, a part of the structure of the protective isolator 2, namely the blocking portion 21, is arranged between two adjacent electrode groups 11, thereby insulating and separating the two electrode groups 11, and forming an avoidance channel for the tab cluster 12, which can effectively prevent the tab from being crushed and other defects, and helps to improve the overall strength. Preferably, a groove is formed at the end of the pole group 11, thereby avoiding the tab cluster 12, providing space for accommodating the tab cluster 12, and avoiding interference. In addition, another part of the structure of the protective isolator 2, namely the protective portion 22, can block the tab cluster 12, playing the role of insulation protection and protecting the tab cluster 12.

[0050] Further, preferably, the first preset direction a may be the length direction of the pole group 11 , but is certainly not limited thereto.

[0051] Furthermore, preferably, the entire protective spacer 2, including the blocking portion 21 and the protective portion 22, is made of insulating material to avoid short circuits, which is a basic requirement of the battery and will not be described in detail here.

[0052] It should be noted that: along the first preset direction a, two adjacent pole groups 11 and two sides of the blocking portion 21 therebetween are pressed against each other, and a small gap may also be left, which is selected according to actual needs.

[0053] In this embodiment, preferably, Figures 1 to 3 As shown, the protection portion 22 is connected to the blocking portion 21 , and the protection portion 22 can be folded relative to the blocking portion 21 .

[0054] According to the structure described above, the protective portion 22 can be folded relative to the blocking portion 21 to facilitate assembly. It should be noted that the protective portion 22 can also be non-foldable relative to the blocking portion 21, that is, the protective portion 22 and the blocking portion 21 are fixedly connected and cannot be folded relative to each other. The specific choice is based on actual needs.

[0055] In this embodiment, preferably, Figure 5 、 Figure 12 and Figure 13 As shown, the protection portion 22 and the blocking portion 21 are an integrated structure, and a thinning area 221 is formed at the connection between the protection portion 22 and the blocking portion 21 .

[0056] According to the structure described above, by setting the thinning area 221, it is convenient for the protective part 22 to flip relative to the blocking part 21, and the two are an integrated structure with high overall strength, not easy to be damaged, and no subsequent processing is required, saving manufacturing costs.

[0057] It should be noted that the protective portion 22 and the blocking portion 21 are not limited to the above-mentioned integrated structure. The protective portion 22 and the blocking portion 21 may also be split structures, and the two are rotatably connected via a rotating shaft, so that the protective portion 22 can be flipped relative to the blocking portion 21.

[0058] In this embodiment, preferably, Figure 5 、 Figure 12 and Figure 13 As shown, in the first preset direction a, protective portions 22 are provided on both sides of the blocking portion 21 .

[0059] According to the structure described above, the two protective parts 22 can block both sides of the blocking part 21 at the same time, which has a better protective effect. Of course, it is not limited to this. The protective part 22 can also be set on only one side of the blocking part 21, depending on actual needs.

[0060] In this embodiment, preferably, Figure 5 、 Figure 12 and Figure 13 As shown, along the second preset direction b, protective parts 22 are provided on both sides of the connection between the two pole groups 11.

[0061] According to the structure described above, the protection portion 22 is provided on both sides of the avoidance groove 111 to improve the insulation protection effect. Of course, it is not limited to this. The protection portion 22 can also be provided on one side of the connection between the two pole groups 11 along the second preset direction b. The specific selection is based on actual needs.

[0062] Furthermore, preferably, the second preset direction b is the width direction of the pole group 11 , but is not limited thereto.

[0063] In this embodiment, preferably, Figure 5 、 Figure 15 and Figure 16As shown, avoidance grooves 111 are formed at both ends of any two adjacent pole groups 11 that are close to each other, so that the pole ear clusters 12 at the ends of the two pole groups 11 can extend into the opposite avoidance grooves 111 through the installation openings 211 on the spacing member, which can effectively prevent interference.

[0064] It should be noted that: not limited to the above structure, only one end of any two adjacent pole groups 11 that are close to each other is provided with an avoidance groove 111, that is, only the end of one pole group 11 is provided with an avoidance groove 111, and the end of the other pole group 11 is not provided with a groove, and for the pole group 11 provided with the avoidance groove 111, the pole ear of the pole group 11 is hidden in the avoidance groove 111 and does not protrude from the open end of the avoidance groove 111 to avoid interference, and the pole ear cluster 12 of the other pole group 11 is extended to the opposite avoidance groove 111 through the installation opening 211 on the spacer component, and the docking assembly of the two pole groups 11 can also be achieved. In this case, only one protective part 22 can be provided, that is, the protective isolation member 2 can have only one blocking part 21 and one protective part 22. Of course, it is not limited to this, and a structure with two protective parts 22 can also be adopted.

[0065] In this embodiment, preferably, Figure 6 、 Figure 7 、 Figures 8 to 11 As shown, the battery cell also includes a supporting side plate 3 and a supporting end plate 4; wherein, along the third preset direction c, supporting side plates 3 are provided on both sides of the pole group assembly 1, and the blocking portion 21 abuts against the side of the supporting side plate 3; along the first preset direction a, supporting end plates 4 are provided at both ends of the pole group assembly 1, and the supporting end plates 4 are connected to the supporting side plates 3; the supporting end plates 4 are formed with through holes 41.

[0066] According to the structure described above, the supporting side plates 3 support and protect the pole group 11, facilitating the operation of inserting the pole group 11 into the shell. The supporting end plates 4 protect the ends of the pole group 11 and ensure that the thrust is balanced when the pole group 11 enters the shell. The two supporting end plates 4 connect the two supporting side plates 3 into one, forming a frame, which helps to improve the overall strength.

[0067] Further, preferably, the third preset direction c is the height direction of the pole group 11 , but of course, it is not limited thereto.

[0068] It should be noted that the number of the supporting side plates 3 is not limited to two, but may also be one, that is, along the third preset direction c, only one side of the pole group assembly 1 is provided with a supporting side plate 3;

[0069] The number of the supporting end plates 4 is not limited to two, but may also be one, that is, along the first preset direction a, only one end of the pole group assembly 1 is provided with a supporting end plate 4 .

[0070] In this embodiment, preferably, Figure 8 and Figure 9 As shown, the support end plate 4 and the support side plate 3 are an integral injection-molded structure. This integral structure offers high strength and strong deformation resistance, providing excellent protection for the electrode assembly 11. Furthermore, the structure is easy to form, requiring no subsequent processing. Of course, the above molding method is not the only option. The support side plate 3 and the support end plate 4 can also be independent components that can be assembled together later, for example, by gluing, snap-fitting, or hot-melting.

[0071] In this embodiment, preferably, Figure 2 、 Figure 4 and Figure 8 As shown, along the third preset direction c, support side panels 3 are provided on both sides of the pole group assembly 1; along the first preset direction a, support end panels 4 are provided on both ends of the pole group assembly 1, and the two support end panels 4 are respectively connected to the two support side panels 3 to form a U-shaped frame. At least one of the support end panels 4 is formed with a cutout 42 that passes through both sides along the second preset direction b, so that the support end panels 4 form a two-section structure. As can be seen, for the U-shaped frame, the cutout is provided in its structure, which facilitates the assembly of the pole group assembly 1 to the frame and improves assembly efficiency.

[0072] Further, preferably, the third preset direction c is the height direction of the pole group 11 , but of course, it is not limited thereto.

[0073] In this embodiment, preferably, Figure 5 and Figure 6 As shown, a plurality of auxiliary air-guiding protrusions 31 are formed on the side of the supporting side plate 3 facing away from the pole group 11 , and the plurality of auxiliary air-guiding protrusions 31 are sequentially spaced along the first preset direction a.

[0074] According to the structure described above, an exhaust channel is formed on the periphery of the auxiliary air guide protrusion 31 to facilitate exhaust during thermal runaway. It can be seen that a connected exhaust channel is formed on the entire periphery of the frame composed of the supporting side plate 3 and the supporting end plate 4, and the exhaust channels on both sides of the frame can also be connected together through the gap at the relative joint of the two pole groups 11, thereby further improving the exhaust efficiency during thermal runaway.

[0075] In this embodiment, preferably, Figure 5 As shown, one of the two ends of any two adjacent electrode groups 11 close to each other forms a positive electrode ear cluster 121, and the other one forms a negative electrode ear cluster 122, and the positive electrode ear cluster 121 and the negative electrode ear cluster 122 are both arranged along the large surface side parallel to the electrode group 11, and the positive electrode ear cluster 121 and the negative electrode ear cluster 122 are stacked together and connected by welding.

[0076] According to the structure described above, the tabs of the two electrode groups 11 are welded horizontally, which simplifies the process and further reduces the internal resistance.

[0077] In this embodiment, preferably, Figure 14 As shown, the battery cell also includes a shell 5 and a cover plate 6; wherein, along the first preset direction a, openings are formed at both ends of the shell 5, and the cover plate 6 is installed at the two openings of the shell 5, and the cover plate 6 is formed with a conductive boss 61 protruding toward the side away from the pole group assembly 1.

[0078] According to the structure described above, other parts of the cover plate 6 are eliminated, and only the metal cover plate 6 is retained. A conductive boss 61 protruding outward is provided on the cover plate 6 as an electric energy output terminal, which has high space utilization and helps to increase the capacity of the battery cell. In addition, an insulating support end plate 4 is provided under the cover plate 6 to prevent problems such as short circuits, making it safer and more reliable.

[0079] Furthermore, preferably, the cover plate 6 can be made of aluminum, i.e., a plain aluminum plate. Of course, the material of the cover plate 6 is not limited thereto, and can also be other materials, such as a copper-aluminum composite plate, etc., and the material selection of the cover plate 6 is different for different batteries. For example, for a sodium battery, both cover plates 6 are made of aluminum, while for a lithium battery, one cover plate 6, i.e., the positive cover plate 6, is made of aluminum, and the other cover plate 6, i.e., the negative cover plate 6, is made of a copper-aluminum composite material, and so on.

[0080] Further, preferably, Figure 11 As shown, along the third preset direction c, a raised adapter portion 43 is formed on both sides of the support end plate 4, and this raised adapter portion 43 is adapted to the aforementioned auxiliary air guide protrusion 31, and preferably, along the third preset direction c, the height of the aforementioned raised adapter portion 43 relative to the support end plate 4 is H, and 0.3mm<H<1.5mm. It can be seen that along the third preset direction c, the height of the auxiliary air guide protrusion 31 relative to the support side plate 3 is also equal to the aforementioned H, and the value of H is appropriate, which not only ensures the exhaust effect during thermal runaway, but also occupies a small space, which helps to increase the capacity of the battery cell.

[0081] Further, preferably, Figure 10 As shown, along the first preset direction a, the thickness of the support cover 6 is T, and 0.8mm<T<3mm, which can not only ensure a good insulation effect and thrust balance when entering the shell, but also occupy a small space, which is helpful to increase the capacity of the battery cell.

[0082] It should be noted that the aforementioned cover plates 6 are not limited to being provided at both openings of the shell, and the aforementioned end plate may also be provided at only one opening of the shell.

[0083] In this embodiment, preferably, Figure 5and Figure 12 As shown, the blocking portion 21 is formed with a cutout 212 , and the two ends of the cutout 212 are respectively connected to the installation opening 211 and the outside, and the tab cluster 12 of the electrode group 11 can move into the installation opening 211 through the cutout 212 .

[0084] According to the structure described above, the tab cluster 12 of the electrode group 11 can be moved into the installation opening 211 through the side cutout 212, thereby improving the convenience of assembly.

[0085] In this embodiment, preferably, Figure 1 As shown, the battery cell also includes a Mylar film 7, and the Mylar film 7 is wrapped around the outside of the entire assembly of the electrode group component 1, the protective isolation member 2, the support side plate 3 and the support end plate 4, and along the first preset direction a, at least one end of the Mylar film 7 is open, which can avoid the pole ear cluster 12, facilitate exhaust during thermal runaway, and facilitate liquid injection, etc.

[0086] According to the structure described above, the Mylar film 7 is wrapped around the outside of the entire assembly of the pole group component 1, the protective spacer 2, the supporting side plate 3 and the supporting end plate 4 to improve the insulation protection capability.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A pole group assembly (1) and a protective isolation member (2); wherein the pole group assembly (1) comprises a plurality of pole groups (11) arranged in sequence along a first preset direction, and at least one of two ends of any two adjacent pole groups (11) close to each other is formed with an avoidance groove (111), and the pole ear clusters (12) of the pole groups (11) are arranged in the corresponding avoidance grooves (111); The protective isolation member (2) comprises a blocking portion (21) and a protective portion (22) connected to each other; the blocking portion (21) is provided between any two adjacent pole groups (11); the blocking portion (21) is formed with a mounting opening (211), and the pole ear cluster (12) of the pole group (11) can extend into the avoidance groove (111) of the adjacent pole group (11) through the mounting opening (211); along the second preset direction, the protective portion (22) is provided on at least one side of the relative connection between the two pole groups (11), and the protective portion (22) is used to shield the pole ear clusters (12) of the two pole groups (11).

2. The battery cell according to claim 1, characterized in that The protection portion (22) is connected to the blocking portion (21), and the protection portion (22) can be folded relative to the blocking portion (21).

3. The battery cell according to claim 1, characterized in that The protection portion (22) and the blocking portion (21) are an integrated structure, and a thinning area (221) is formed at the connection between the protection portion (22) and the blocking portion (21).

4. The battery cell according to claim 1, characterized in that The protection part (22) and the blocking part (21) are split structures, and the two are rotatably connected via a rotating shaft.

5. The battery cell according to claim 1, characterized in that In the first preset direction, the protective portion (22) is provided on both sides of the blocking portion (21); and / or Along the second preset direction, the protection parts (22) are provided on both sides of the relative connection between the two pole groups (11).

6. The battery cell according to claim 1, characterized in that Both ends of any two adjacent pole groups (11) close to each other are formed with avoidance grooves (111).

7. The battery cell according to claim 1, characterized in that The battery cell further comprises a supporting side plate (3) and a supporting end plate (4); wherein, along a third preset direction, at least one side of the electrode assembly (1) is provided with the supporting side plate (3), and the blocking portion (21) abuts against a side portion of the supporting side plate (3); Along the first preset direction, at least one end of the pole group assembly (1) is provided with the support end plate (4), and the support end plate (4) is connected to the support side plate (3); the support end plate (4) is formed with a through hole (41).

8. The battery cell according to claim 7, characterized in that: The supporting end plate (4) and the supporting side plate (3) are an integral injection-molded structure; and / or A plurality of auxiliary air-guiding protrusions (31) are formed on a side of the supporting side plate (3) facing away from the pole group (11), and the plurality of auxiliary air-guiding protrusions (31) are sequentially spaced along the first preset direction; and / or Along the third preset direction, the supporting side plates (3) are provided on both sides of the pole group assembly (1); along the first preset direction, the supporting end plates (4) are provided on both ends of the pole group assembly (1), and the two supporting end plates (4) are respectively connected to the two supporting side plates (3) to form a U-shaped frame, and at least one of the supporting end plates (4) is formed with a cutout (42) passing through both sides thereof along the second preset direction, so that the supporting end plates (4) form a two-section structure.

9. The battery cell according to claim 1, characterized in that: One of the two ends of any two adjacent electrode groups (11) close to each other forms a positive electrode ear cluster (121), and the other one forms a negative electrode ear cluster (122), and the positive electrode ear cluster (121) and the negative electrode ear cluster (122) are both arranged along the large surface side parallel to the electrode group (11), and the positive electrode ear cluster (121) and the negative electrode ear cluster (122) are stacked together and connected by welding.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The battery cell further comprises a housing (5) and a cover plate (6); wherein, along the first preset direction, at least one end of the housing (5) is formed with an opening, and the cover plate (6) is mounted at at least one opening of the housing (5), and the cover plate (6) is formed with a conductive boss (61) protruding toward a side away from the electrode assembly (1); and / or The blocking portion (21) is formed with a cutout (212), and is connected to the installation opening (211) and the outside world along both ends of the cutout (212), and the pole lug cluster (12) of the pole group (11) can move into the installation opening (211) through the cutout (212).

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