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, a side plate and an adjusting component, the side plate is arranged on one side of the pole group assembly, and a convex part is formed on the side plate; the pole group assembly comprises a plurality of pole groups which are sequentially arranged along a preset direction, and a lug boss and an adjusting component are arranged between any two adjacent pole groups; an open-type containing cavity is formed in the protruding part, at least part of the structure of the adjusting component extends into the containing cavity through an end opening of the containing cavity, and the tab clusters of the two adjacent pole groups extend into the containing cavity through side openings of the corresponding containing cavity respectively and are limited in the containing cavity by the adjusting component. Therefore, the whole pole group is designed into a split structure, so that the length of a single pole group is reduced, that is, the length of the pole piece is reduced, the pole piece is not prone to wrinkling, deformation, layer channeling or breakage, the yield is improved, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly 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 to increase the capacity, then the length of the electrode group is increased, that is, the length of the electrode sheet is increased. In the process of electrode sheet production and later assembly, it is easy to have problems such as wrinkles, deformation, layer displacement, or fracture, resulting in a reduction in the yield. Summary of the Utility Model

[0003] The purpose of this application is to provide a battery cell, which to a certain extent solves the technical problem in the existing technology that in order to increase the capacity, the battery cell needs to be designed to be longer, which in turn increases the length of the electrode group, that is, increases the length of the electrode sheet. In the process of electrode sheet production and later assembly, it is easy to have problems such as wrinkles, deformation, layer displacement, or fracture, resulting in a reduction in the yield.

[0004] This application provides a battery cell, including: an electrode group assembly, a side plate, and an adjustment member; wherein, the side plate is disposed on one side of the electrode group assembly, and the side plate is formed with a protruding portion; the electrode group assembly includes a plurality of electrode groups sequentially arranged along a preset direction, and the protruding portion and the adjustment member are disposed between any two adjacent electrode groups;

[0005] The protruding portion forms an open receiving cavity, and at least a part of the adjustment member extends into the receiving cavity through the end opening of the receiving cavity. The electrode ear clusters of two adjacent electrode groups that are close to each other respectively extend into the receiving cavity through the side openings of the corresponding receiving cavity, and are restricted in the receiving cavity by the adjustment member.

[0006] In the above technical solution, further, the adjustment member includes an inserted portion and a abutting portion connected to each other; wherein, the inserted portion is inserted into the receiving cavity through the end opening, the abutting portion is exposed outside the receiving cavity, and abuts against the side of at least one of the two adjacent electrode groups.

[0007] In any of the above technical solutions, further, the battery cell further includes a housing and an explosion-proof valve; wherein, the electrode group assembly is disposed in the housing, and the explosion-proof valve is installed on the housing; one explosion-proof valve is correspondingly disposed outside at least one of the adjustment members;

[0008] The side plate is formed with exhaust through-holes, and the exhaust through-holes communicate with the accommodation cavity; the adjustment member is formed with a through first channel, and the first channel communicates with the accommodation cavity and the explosion-proof valve respectively to form an exhaust structure that communicates both sides of the electrode group assembly.

[0009] In any of the above technical solutions, further, the battery cell further includes an insulating film, the insulating film wraps the outside of the electrode group assembly, the side plate and the adjustment member, and the insulating film is formed with exhaust through-holes that correspond to and communicate with both ends of the first exhaust channel respectively; the adjustment member is further formed with a second channel that penetrates along the preset direction.

[0010] In any of the above technical solutions, further, the battery cell further includes a protective layer, the protective layer is disposed on the inner side wall of the housing, and is disposed corresponding to the explosion-proof valve, and the protective layer is formed with an exhaust slit.

[0011] In any of the above technical solutions, further, the battery cell further includes a metal cover plate and an insulating layer; wherein, at least one end of the housing along the preset direction is provided with the metal cover plate, and the insulating layer is disposed on a side of the metal cover plate close to the electrode group assembly.

[0012] In any of the above technical solutions, further, the metal cover plate is formed with a conducting portion that protrudes in a direction away from the electrode group assembly.

[0013] In any of the above technical solutions, further, the battery cell further includes an insulating end plate, and along the preset direction, at least one end of the electrode group assembly is provided with the insulating end plate, and each insulating end plate is formed with a through-opening; the side plate is snap-connected to the insulating end plate.

[0014] In any of the above technical solutions, further, one of the insulating end plate and the side plate is formed with a snap, and the other of the insulating end plate and the side plate is formed with a slot, and the snap is snap-connected in the slot.

[0015] In any of the above technical solutions, further, the positive electrode ear clusters and the negative electrode ear clusters of any two adjacent electrode groups that are close to each other both extend into the accommodation cavity and are lapped together, and are connected by welding.

[0016] In any of the above technical solutions, further, the side plate is disposed on a narrow surface side of the electrode group assembly.

[0017] In any of the above technical solutions, further, along the preset direction, the side plate is formed with a plurality of gas guiding notches that are sequentially and spaced apart.

[0018] Compared with the prior art, the beneficial effects of the present application are as follows:

[0019] The present application provides a relatively long battery cell, which can achieve overall capacity increase. The overall electrode group inside the battery cell is designed as a split structure. A convex portion is provided on the side edge of one side of the electrode group, and an adjustment member is provided on the other side of the electrode group. At least part of the structure of the adjustment member extends into the accommodation cavity through the end opening of the accommodation cavity of the convex portion. The tab clusters of two adjacent electrode groups respectively extend into the accommodation cavity through the side openings of the corresponding accommodation cavities, and are restricted in the accommodation cavity by the adjustment member, avoiding damage to the tab clusters, thereby making it possible to achieve the docking of the two electrode groups.

[0020] As can be seen from the above, the overall electrode group is designed as a split structure, thereby reducing the length of a single electrode group, that is, reducing the length of the electrode plate. Furthermore, problems such as wrinkles, deformation, layer displacement, or fracture will not occur during the production and later assembly of the electrode plate. Furthermore, it helps to improve the yield rate and helps to reduce costs. In addition, a support component is provided between the two electrode groups, improving the overall strength and the withstand voltage performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a schematic structural diagram of the battery cell provided by the embodiment of the present application;

[0023] Figure 2 is an exploded view of the battery cell provided by the embodiment of the present application;

[0024] Figure 3 is Figure 2 a partially enlarged structural diagram of;

[0025] Figure 4 is another schematic structural diagram of the battery cell provided by the embodiment of the present application;

[0026] Figure 5 is Figure 4 a cross-sectional view along the A-A section;

[0027] Figure 6 is Figure 5 a partially enlarged structural diagram of;

[0028] Figure 7 is a partial structural diagram of the battery cell provided by the embodiment of the present application;

[0029] Figure 8 is Figure 7 a partially enlarged structural schematic diagram;

[0030] Figure 9 is another partial structural schematic diagram of the battery cell provided by the embodiment of the present application;

[0031] Figure 10 is Figure 9 a partially enlarged structural schematic diagram;

[0032] Figure 11 is the structural schematic diagram of the side plate provided by the embodiment of the present application;

[0033] Figure 12 is Figure 11 a partially enlarged structural schematic diagram;

[0034] Figure 13 is the structural schematic diagram of the adjusting member provided by the embodiment of the present application;

[0035] Figure 14 is the assembly drawing of the side plate and the adjusting member provided by the embodiment of the present application;

[0036] Figure 15 is Figure 14 a partially enlarged structural schematic diagram;

[0037] Figure 16 is the exploded view of the metal cover plate and the insulating layer provided by the embodiment of the present application;

[0038] Figure 17 is the assembly drawing of the metal cover plate and the insulating layer provided by the embodiment of the present application;

[0039] Figure 18 is the structural schematic diagram of the insulating end plate provided by the embodiment of the present application;

[0040] Figure 19 is the schematic diagram of the assembly part of the side plate and the insulating end plate provided by the embodiment of the present application;

[0041] Figure 20 is the structural schematic diagram of the protective layer provided by the embodiment of the present application.

[0042] Reference numerals:

[0043] 1 - electrode group assembly, 11 - electrode group, 111 - tab cluster, 2 - side plate, 21 - protrusion, 211 - accommodation cavity, 212 - end opening, 213 - side opening, 214 - exhaust through - hole, 22 - buckle, 23 - air - guiding notch, 3 - adjustment member, 31 - insertion part, 32 - abutting part, 33 - first channel, 34 - second channel, 4 - housing, 5 - explosion - proof valve, 6 - insulating film, 7 - protective layer, 71 - exhaust slit, 8 - metal cover plate, 9 - insulating layer, 10 - insulating end plate, 101 - through - opening, 102 - card slot, 100 - battery cell. Detailed implementation manners

[0044] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present application.

[0045] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various 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 present application claimed, but merely represents the selected embodiments of the present application.

[0046] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0047] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0049] Next, refer to Figures 1 to 20 Describe the battery cell according to some embodiments of the present application.

[0050] See Figures 1 to 15 As shown, an embodiment of the present application provides a battery cell 100, including: a pole group assembly 1, a side plate 2, and an adjustment member 3; wherein, a side plate 2 is disposed on one side of the pole group assembly 1, and the side plate 2 is formed with a convex portion 21; the pole group assembly 1 includes a plurality of pole groups 11 sequentially arranged along a preset direction, and a convex portion 21 and an adjustment member 3 are disposed between any two adjacent pole groups 11;

[0051] The convex portion 21 is formed with an open receiving cavity 211, and at least a part of the structure of the adjustment member 3 extends into the receiving cavity 211 through an end opening 212 of the receiving cavity 211. The pole ear clusters 111 of two adjacent pole groups 11 that are close to each other extend into the receiving cavity 211 through corresponding side openings 213 of the receiving cavity 211 respectively, and are restricted in the receiving cavity 211 by the adjustment member 3.

[0052] According to the above-described structure, the present application provides a relatively long battery cell 100, which can achieve overall capacity increase, and the overall pole group 11 inside the battery cell 100 is designed as a split structure. A convex portion 21 is provided on one side edge of the pole group 11, and an adjustment member 3 is disposed on the other side of the pole group 11. At least a part of the structure of the adjustment member 3 extends into the receiving cavity 211 through an end opening 212 of the receiving cavity 211 of the convex portion 21. The pole ear clusters 111 of two adjacent pole groups 11 extend into the receiving cavity 211 through corresponding side openings 213 of the receiving cavity 211 respectively, and are restricted in the receiving cavity 211 by the adjustment member 3, avoiding damage to the pole ear clusters 111, thereby providing the possibility for the docking of the two pole groups 11.

[0053] Combined with the above, the overall pole group 11 is designed as a split structure, thereby reducing the length of a single pole group 11, that is, reducing the length of the pole piece. Further, problems such as wrinkles, deformation, layer displacement, or fracture will not occur during the production and later assembly of the pole piece, which helps to improve the yield rate and reduce costs. In addition, a support assembly is disposed between the two pole groups 11, improving the overall strength and the voltage resistance performance.

[0054] Further, preferably, the preset direction is the same as the length direction a of the pole group 11. Of course, it is not limited thereto.

[0055] Further, preferably, the side plate 2 is disposed on a narrow side of the pole group assembly 1. This narrow side specifically refers to the side portion with a smaller area formed by the long side and the wide side. While improving the convenience of the pole group assembly 1 entering the shell, the side plate 2 is not disposed on the large side of the pole group assembly 1, without affecting heat dissipation, improving the safety and reliability of the use of the battery cell 100. Of course, it is not limited thereto. The side plate 2 can also be disposed on the large side of the pole group assembly 1, that is, the side portion with a larger area formed by the long side and the high side.

[0056] Further, preferably, the protrusion 21 and the side plate 2 can be integrally formed by injection molding. Of course, this is not limited to this, and the molding method can be selected according to actual needs.

[0057] Further, preferably, along a direction perpendicular to the preset direction c, that is, along the height direction of the pole group 11 , a part of the structure of the adjustment member 3 is inserted into the accommodating cavity 211 of the protrusion 21 , but of course, it is not limited thereto.

[0058] It should be noted that: along the preset direction, two adjacent pole groups 11 and two sides of the protrusion 21 therebetween are pressed against each other, and a small gap may be left, which is selected according to actual needs.

[0059] In this embodiment, preferably, Figure 6 , Figure 8 , Figure 10 and Figure 15 As shown, the adjustment member 3 includes an insertion portion 31 and a supporting portion 32 connected to each other; wherein the insertion portion 31 is inserted into the accommodating cavity 211 via the end opening 212, and the supporting portion 32 is exposed in the accommodating cavity 211 and simultaneously supports the sides of two adjacent pole groups 11.

[0060] According to the structure described above, it can be known that the insertion portion 31 extends between two adjacent pole groups 11 and is inserted together with the protrusion 21, thereby closing one end of the aforementioned side opening 213, so that the pole ear clusters 111 of the two adjacent pole groups 11 are restricted in the accommodating cavity 211, which plays a role in supporting and protecting the pole ear clusters 111, avoiding the pole ear clusters 111 from being crushed, and providing the possibility of realizing a long battery cell 100; the abutment portion 32 abuts against the sides of the two adjacent pole groups 11, and the two pole groups 11 support and limit the abutment portion 32, so that the adjustment member 3 and the two pole groups 11 are assembled more stably. In addition, the abutment portion 32 separates the inner wall of the shell 4 from the side wall of the pole group 11 by a certain gap, which is helpful for exhaust during thermal runaway.

[0061] Furthermore, preferably, the adjusting member 3 is made of insulating material to avoid short circuit.

[0062] Further, preferably, the insertion portion 31 and the abutting portion 32 are an integrated structure and can be integrally formed by injection molding, but of course, it is not limited thereto.

[0063] Further, preferably, the inserting portion 31 and the abutting portion 32 are arranged perpendicularly.

[0064] Further, preferably, the insertion part 31 is a hollow structure forming a first channel 33 described below. Of course, it is not limited thereto and may also be a solid structure. That is to say, no exhaust channel is formed in the assembled structure of the convex part 21 and the adjustment member 3, and it is specifically selected according to actual needs.

[0065] Further, preferably, the abutting part 32 may be a plate-like structure forming a first channel 33 described below. Of course, it is not limited thereto and may also be a solid structure.

[0066] It should be noted that: the abutting part 32 may also only abut against the side part of one of the two adjacent pole groups 11, and it is specifically selected according to actual needs.

[0067] In addition, it should also be noted that: the materials of the side plate 2 and the adjustment member 3 are insulating materials, which is common knowledge and will not be elaborated here.

[0068] In this embodiment, preferably, as Figure 1 , Figure 2 , Figure 6 , Figure 8 and Figure 9 shown, the battery cell 100 further includes a housing 4 and an explosion-proof valve 5; wherein, the pole group assembly 1 is disposed in the housing 4, and the explosion-proof valve 5 is installed on the housing 4; an explosion-proof valve 5 is correspondingly disposed outside each adjustment member 3;

[0069] The side plate 2 forms an exhaust through hole 214, and the exhaust through hole 214 communicates with the accommodation cavity 211; the adjustment member 3 forms a through first channel 33, and the first channel 33 communicates with the accommodation cavity 211 and the explosion-proof valve 5 respectively to form an exhaust structure connecting both sides of the pole group assembly 1. Preferably, this first channel 33 extends along a direction perpendicular to the preset direction, and the adjustment member 3 further forms a second channel 34 penetrating along the preset direction. It can be seen that both sides of the pole group 11 are connected together through this first channel 33, and with the assistance of the second channel 34, an annular connected exhaust channel is formed around each pole group 11.

[0070] According to the structure described above, for each pole group 11, its entire outer periphery is connected inside the housing 4 to form an annular exhaust channel. Therefore, no matter which pole group 11 inside the battery cell 100 has a thermal runaway, the high-temperature gas generated will be quickly discharged along the exhaust channel, which helps to improve the safety and reliability of the battery cell 100.

[0071] It should be noted that: it is not limited to setting an explosion-proof valve 5 outside each adjustment member 3, and it is also possible to select to set explosion-proof valves 5 only outside a part of the adjustment members 3, and it is specifically selected according to actual needs.

[0072] In this embodiment, preferably, as Figure 2 shown, the battery cell 100 further includes an insulating film 6, which is wrapped around the outside of the electrode group assembly 1, the side plate 2, and the adjusting member 3, and the insulating film 6 is formed with exhaust through holes that correspond to and are respectively communicated with both ends of the exhaust first channel 33, without affecting the normal exhaust during thermal runaway of the battery cell 100.

[0073] According to the structure described above, after wrapping the electrode group 11, the side plate 2, and the adjusting member 3 together with the insulating film 6 and then putting them into the shell as a whole, it is more convenient to operate, improves production efficiency, and the insulating film 6 also plays a role of insulation and protection.

[0074] Furthermore, preferably, this insulating film 6 can be a mylar film in the prior art. Of course, it is not limited to this, and it can also be selected according to actual needs.

[0075] In this embodiment, preferably, as Figure 20 shown, the battery cell 100 further includes a protective layer 7, which is disposed on the inner sidewall of the housing 4 and corresponds to the explosion-proof valve 5, and the protective layer 7 is formed with an exhaust slit 71.

[0076] According to the structure described above, by providing the protective layer 7 inside the housing 4, it protects the electrode group 11 from damaging the explosion-proof valve 5, and an exhaust slit 71 is provided thereon, so that normal exhaust can occur during thermal runaway of the battery cell 100.

[0077] Furthermore, preferably, the material of the protective layer 7 can be rubber, plastic sheet, etc., which is specifically selected according to actual needs.

[0078] In this embodiment, preferably, as Figure 16 and Figure 17 shown, the battery cell 100 further includes a metal cover plate 8 and an insulating layer 9; wherein, one end of the housing 4 along a preset direction is provided with the metal cover plate 8, and the insulating layer 9 is disposed on the side of the metal cover plate 8 close to the electrode group assembly 1.

[0079] Furthermore, preferably, the metal cover plate 8 is formed with a conducting portion protruding in a direction away from the electrode group assembly 1.

[0080] According to the structure described above, other cover plate parts are cancelled, and only the metal cover plate 8 is retained. Moreover, the metal cover plate 8 is provided with a conducting portion protruding in a direction away from the electrode group assembly 1, which serves as the power output end, saving the internal space of the housing 4, having a higher space utilization rate, contributing to the capacity increase of the battery cell 100, and an insulating layer 9 is disposed on the inner side of the metal cover plate 8 to prevent problems such as short circuit, being safer and more reliable. Moreover, the insulating layer 9 is relatively thin, reducing the occupation of the internal space of the housing 4 and further improving the space utilization rate.

[0081] Further, preferably, the material of the metal cover plate 8 is aluminum. That is to say, the metal cover plate 8 can be a polished aluminum plate and is used as the positive cover plate. Of course, this is not the only option. The material of the metal cover plate 8 can also be other materials and can also be used as the negative cover plate, etc.

[0082] Further, preferably, the material of the insulating layer 9 can be rubber, plastic sheet, etc., and is specifically selected according to actual needs.

[0083] It should be noted that: It is not limited to arranging the aforementioned metal cover plate 8 structure at one end of the housing 4 along the preset direction. The aforementioned metal cover plate 8 structure can also be arranged at both ends of the housing 4 along the preset direction, and is specifically selected according to actual needs.

[0084] In addition, it should also be noted that: The inner side of the metal cover plate 8 refers to the side close to the electrode group assembly 1, and the outer side of the metal cover plate 8 refers to the side far from the electrode group assembly 1.

[0085] In this embodiment, preferably, as Figure 18 and Figure 19 shown, the battery cell 100 further includes an insulating end plate 10. Along the preset direction, one end of the electrode group assembly 1 is provided with an insulating end plate 10, and each insulating end plate 10 is formed with a through port 101; the side plate 2 is snap-fitted with the insulating end plate 10.

[0086] According to the structure described above, an insulating support plate is arranged at one end of the electrode group assembly 1 to ensure the thrust balance when the electrode group 11 is inserted into the housing. Moreover, the side plate 2 is connected to the insulating support plate, the overall strength is higher, the fixing and protection effects on the electrode group assembly 1 are better, and it can also play an insulating and protective role. And only an insulating support plate is arranged at one end of the electrode group assembly 1, saving material costs.

[0087] Further, preferably, the material of the insulating end plate 10 can be rubber, plastic, etc., and is specifically selected according to actual needs.

[0088] It should be noted that: It is not limited to only arranging the insulating end plate 10 at one end of the electrode group 11. Along the preset direction, insulating support plates can also be arranged at both ends of the electrode group assembly 1, and are specifically designed according to actual needs.

[0089] In this embodiment, preferably, as Figure 19 shown, the side plate 2 is formed with a buckle 22, and the insulating end plate 10 is formed with a slot 102, and the buckle 22 is snap-fitted in the slot 102.

[0090] According to the structure described above, the assembly of the side plate 2 and the insulating end plate 10 is realized through the snap-fit cooperation between the snap 22 and the slot 102. The operation is simple, convenient, time-saving and labor-saving. Moreover, the overall structure after assembly is more stable and firm. In addition, a detachable connection method is adopted between the side plate 2 and the insulating end plate 10, which has repeatable operability.

[0091] It should be noted that: it is not limited to the above. It is also possible to set the snap 22 on the insulating end plate 10 and set the slot 102 on the side plate 2, and specifically select according to actual needs.

[0092] In this embodiment, preferably, as Figure 8 and Figure 10 shown, the positive tab clusters 111 and the negative tab clusters 111 of any two adjacent pole groups 11 that are close to each other extend into the aforementioned accommodation cavity 211 and are lapped together, and are connected by welding. That is to say, one of the pole groups 11 forms a positive tab cluster 111, the other pole group 11 forms a negative tab cluster 111, and the positive tab cluster 111 and the negative tab cluster 111 are lapped and welded together.

[0093] According to the structure described above, the positive tab clusters 111 and the negative tab clusters 111 of the two pole groups 11 are directly lapped together, reducing structures such as intermediate connection pieces, which helps to reduce the internal resistance. At the same time, it can also save the length of the tab clusters 111, reduce the space inside the battery cell 100, and help to increase the capacity of the battery cell 100.

[0094] In this embodiment, preferably, as Figure 7 shown, along the preset direction, the side plate 2 is formed with a plurality of air guide notches 23 arranged at intervals in sequence, in order to increase the exhaust gap and facilitate the exhaust when the battery cell 100 is in thermal runaway.

[0095] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A pole group assembly, a side plate, and an adjustment member; wherein, the side plate is disposed on one side of the pole group assembly, and the side plate is formed with a convex portion; the pole group assembly includes a plurality of pole groups sequentially arranged along a preset direction, and the convex portion and the adjustment member are disposed between any two adjacent pole groups; The convex portion is formed with an open receiving cavity, and at least a part of the structure of the adjustment member extends into the receiving cavity through an end opening of the receiving cavity. The pole ear clusters of two adjacent pole groups that are close to each other extend into the receiving cavity through side openings of the corresponding receiving cavity, respectively, and are restricted in the receiving cavity by the adjustment member.

2. The battery cell according to claim 1, wherein, The adjustment member includes an inserted portion and an abutting portion connected to each other; wherein, the inserted portion is inserted into the receiving cavity through the end opening, the abutting portion is exposed outside the receiving cavity, and abuts against the side of at least one of the two adjacent pole groups.

3. The battery cell according to claim 1, wherein, The battery cell further includes a housing and an explosion-proof valve; wherein, the pole group assembly is disposed in the housing, and the explosion-proof valve is installed on the housing; one explosion-proof valve is correspondingly disposed outside at least one of the adjustment members; The side plate is formed with an exhaust through hole, and the exhaust through hole is communicated with the receiving cavity; the adjustment member is formed with a through first channel, and the first channel is communicated with the receiving cavity and the explosion-proof valve respectively to form an exhaust structure communicating both sides of the pole group assembly; the adjustment member is further formed with a second channel penetrating along the preset direction.

4. The battery cell according to claim 3, characterized in that, The battery cell further includes an insulating film, and the insulating film wraps the outside of the pole group assembly, the side plate, and the adjustment member, and the insulating film is formed with exhaust through holes that correspond to and are respectively communicated with both ends of the exhaust first channel.

5. The battery cell according to claim 3, wherein The battery cell further includes a protective layer, and the protective layer is disposed on the inner side wall of the housing, corresponding to the explosion-proof valve, and the protective layer is formed with an exhaust slit.

6. The battery cell according to claim 3, wherein, The battery cell further includes a metal cover plate and an insulating layer; wherein, the metal cover plate is disposed at at least one end of the housing along the preset direction, and the insulating layer is disposed on the side of the metal cover plate close to the pole group assembly.

7. The battery cell according to claim 6, characterized in that, The metal cover plate is formed with a conducting portion protruding in a direction away from the pole group assembly.

8. The battery cell according to claim 1, characterized in that, The battery cell further includes an insulating end plate, and along the preset direction, at least one end of the pole group assembly is provided with the insulating end plate, and each insulating end plate is formed with a through opening; the side plate is snap-fitted with the insulating end plate.

9. The cell according to claim 8, wherein One of the insulating end plate and the side plate is formed with a snap, and the other of the insulating end plate and the side plate is formed with a slot, and the snap is snap-fitted in the slot.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The positive pole ear clusters and the negative pole ear clusters of any two adjacent pole groups that are close to each other both extend into the receiving cavity and are lapped together, and are connected by welding; and / or The side plate is disposed on one narrow side of the pole group assembly; and / or Along the preset direction, the side plate is formed with a plurality of air guiding notches sequentially and spaced apart.

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