Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a shell, a pole group, a first cover plate assembly and a second cover plate, the pole group is arranged in the shell, and the first cover plate assembly and the second cover plate are arranged at two openings of the shell; the first cover plate assembly comprises a first cover plate body, an insulating sheet, a lower plastic part and a pole, and the pole is mounted on the inner side of the first cover plate body and connected with a first tab of the pole group; the lower plastic part is mounted between the pole and the inner side of the first cover plate body, and insulating sheets are arranged on the inner side surfaces of the first cover plate body on the two sides of the lower plastic part; the second cover plate is a conductive metal plate, and the second cover plate is connected with the second tab of the pole group. Therefore, the cover plate structures at the two ends of the shell are redesigned, part of the lower plastic part is replaced by the insulating sheet in the first cover plate assembly, other structures of the second cover plate are removed, and only the first cover plate body is reserved, so that the space utilization rate is increased, and the capacity of the battery cell is improved.

Description

Technical Field

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

[0002] At present, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. Lithium batteries are the core components of battery pack safety and assembly, and their structural design is crucial to battery safety. Conventional blade lithium batteries use a two-side output ear structure, and both the positive and negative electrodes are equipped with cover assemblies. The cover assembly structure is large in size, which will occupy a certain amount of battery cell space and reduce the battery cell capacity. Utility Model Content

[0003] The purpose of the present application is to provide a battery cell, which to some extent solves the technical problem in the prior art that the blade lithium battery cell adopts a pole ear structure on both sides, and both the positive and negative electrodes are provided with a cover assembly, and the cover assembly structure is large in volume, which will occupy a certain battery cell space and reduce the battery cell capacity.

[0004] The present application provides a battery cell, comprising: a shell, a pole group, a first cover plate assembly and a second cover plate; wherein the pole group is arranged in the shell, and the first cover plate assembly and the second cover plate are respectively arranged at two openings of the shell along a preset direction; the first cover plate assembly comprises a first cover plate body, an insulating sheet, a lower plastic part and a pole, the pole is installed on the inner side of the first cover plate body, and the pole is connected to the first pole ear of the pole group;

[0005] One end of the pole passes through the first cover body and extends to the outside of the first cover body. The lower plastic part is installed between the pole and the inner side of the first cover body, and the inner surface of the first cover body on both sides of the lower plastic part is provided with the insulating sheet; the second cover is a conductive metal plate, and the second cover is connected to the second pole ear of the pole group.

[0006] In the above technical solution, further, the battery cell also includes an end plate, and the end plate is installed on one end of the electrode group provided with the second electrode ear, and the second cover plate is arranged against the end plate.

[0007] In any of the above technical solutions, further, the end plate is formed with an escape space running through both sides thereof along a preset direction, the second pole ear is arranged in the escape space, and the second pole ear is abutted against the second cover plate through an opening of the escape space.

[0008] In any of the above technical solutions, further, a side of the second cover plate close to the pole group has a planar structure and abuts against the second pole ear of the pole group.

[0009] In any of the above technical solutions, further, the second cover plate is the first cover plate body.

[0010] In any of the above technical solutions, further, the pole includes a first connecting part and a second connecting part connected to each other; wherein, the first connecting part is arranged on a side of the second connecting part close to the first cover body; the first connecting part is sequentially passed through the lower plastic part and the first cover body; the side of the second connecting part facing away from the first cover body abuts against the pole ear of the pole group, and is connected by welding.

[0011] In any of the above technical solutions, further, the first cover plate assembly also includes a sealing ring, which is in a convex shape and is sleeved on the outside of the first connecting part and abuts against a side surface of the second connecting part close to the first cover plate body; the sealing ring is pressed between the first cover plate body and the first connecting part and the second connecting part.

[0012] In any of the above technical solutions, further, the lower plastic part forms a first groove, the second connecting part is installed in the first groove, and one end of the first connecting part sequentially passes through the lower plastic part and the first cover body and extends to the outside of the first cover body.

[0013] In any of the above technical solutions, further, the first cover plate assembly also includes a clamping member and an upper plastic part; wherein the clamping member is sleeved on one end of the pole exposed on the first cover plate body, and at least part of the structure of the upper plastic part is pressed between the clamping member and the first cover plate body; the clamping member is connected to the pole by welding or riveting.

[0014] In any of the above technical solutions, further, the upper plastic part is formed with a second groove, and the pressing member is arranged in the second groove.

[0015] In any of the above technical solutions, further, the clamping member and the upper plastic part are integrally injection molded by rubber encapsulation.

[0016] In any of the above technical solutions, further, the clamping member is connected to the pole by welding or riveting.

[0017] In any of the above technical solutions, further, one of the upper plastic part and the clamping member is provided with a limiting protrusion, the other of the upper plastic part and the clamping member is provided with a limiting groove, and the limiting protrusion is arranged in the limiting groove.

[0018] In any of the above technical solutions, further, the lower plastic part is adapted to the pole.

[0019] In any of the above technical solutions, further, the insulating sheet is adhered to the inner surface of the first cover body.

[0020] In any of the above technical solutions, further, the pole is connected to the first pole lug of the pole group by welding.

[0021] In any of the above technical solutions, further, the second cover plate is connected to the second pole lug of the pole group by welding.

[0022] In any of the above technical solutions, further, the second cover plate is connected to the shell by welding.

[0023] In any of the above technical solutions, further, the first cover plate body and the shell are connected by welding.

[0024] In any of the above technical solutions, further, the battery cell also includes an explosion-proof valve, and the explosion-proof valve is arranged on the long narrow side of the shell formed by its long side and wide side, and is connected to the interior of the shell.

[0025] In any of the above technical solutions, further, the first pole lug is a negative pole lug, the second pole lug is a positive pole lug, and the second cover plate is formed with an externally protruding connecting protrusion and is used to connect the connecting row.

[0026] Compared with the prior art, the beneficial effects of this application are:

[0027] The battery cell provided in the present application has redesigned the cover structure at both ends of the shell. For the first cover plate assembly, all lower plastic parts except the pole position are eliminated, and only a thinner insulating sheet is set on the first cover plate body. The structure is simple and the molding process is mature. Compared with the lower plastic part with a certain thickness and covering the entire length of the first cover plate body in the prior art, the material cost is low and the space occupied by the pole group is reduced. For example, the height space can be saved by about 3-4mm, which greatly improves the space utilization rate and the capacity of the battery cell. Moreover, the insulating sheet is tightly attached to the first cover plate body, with the first cover plate body as the basis, and the whole is not easy to deform, so the pole ear will not be stuck in the gap.

[0028] For the second cover plate, other components in the cover plate assembly in the prior art are eliminated, and only the structure of the conductive metal plate, such as the metal plate, is retained, which can achieve an ultimate space improvement and help reduce costs.

[0029] The second cover plate eliminates other components in the cover plate assembly in the prior art, and can only retain the structure of the conductive metal plate, such as the metal plate, and reduces the space occupied by the electrode group. For example, the height space can be saved by about 2-3mm, which greatly improves the space utilization rate, can achieve the ultimate space improvement, increase the battery cell capacity, reduce the assembly process and reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. 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 paying any creative work.

[0031] Figure 1 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application; Figure 2 for Figure 1 Cross-sectional view along section AA;

[0032] Figure 3 for Figure 2 A schematic diagram of a local enlarged structure;

[0033] Figure 4 for Figure 2 A schematic diagram of a local enlarged structure;

[0034] Figure 5 for Figure 1 Cross-sectional view along section BB;

[0035] Figure 6 A partial exploded view of a battery cell provided in an embodiment of the present application;

[0036] Figure 7 Another partial exploded view of a battery cell provided in an embodiment of the present application;

[0037] Figure 8 An exploded view of a first cover plate assembly provided in an embodiment of the present application;

[0038] Fig. 9 An assembly diagram of the first cover plate assembly provided in an embodiment of the present application.

[0039] Reference numerals:

[0040] 1-shell, 2-pole group, 21-first pole ear, 22-second pole ear, 3-first cover assembly, 31-first cover body, 311-installation through hole, 32-insulating sheet, 33-lower plastic part, 331-avoidance through hole, 34-pole, 341-first connecting part, 342-second connecting part, 35-sealing ring, 36-upper plastic part, 37-pressing member, 4-second cover, 41-connecting protrusion, 5-end plate, 51-avoidance space, 6-Mylar film, 7-side plate. 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 of the embodiments.

[0042] The components of the embodiments of the present application generally described and shown in the drawings herein 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 application claimed, but merely represents the 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 the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] Refer to the following Figures 1 to 9 The battery cell according to some embodiments of the present application is described.

[0047] See also Figures 1 to 9As shown, an embodiment of the present application provides a battery cell, comprising: a shell 1, a pole group 2, a first cover plate assembly 3 and a second cover plate 4; wherein the pole group 2 is arranged in the shell 1, and the first cover plate assembly 3 and the second cover plate 4 are respectively arranged at two openings of the shell 1 along a preset direction; the first cover plate assembly 3 comprises a first cover plate body 31, an insulating sheet 32, a lower plastic part 33 and a pole 34, the pole 34 is installed on the inner side of the first cover plate body 31, and the pole 34 is connected to the first pole ear 21 of the pole group 2;

[0048] One end of the pole 34 passes through the first cover body 31 and extends to the outside of the first cover body 31. That is, the first cover body 31 is formed with a mounting through hole 311 that runs through the inside and outside thereof. One end of the pole 34 can extend to the outside of the first cover body 31 through the mounting through hole 311. Here, it should be noted that the inner side mentioned above refers to the side close to the pole group 2, that is, the side located inside the shell 1 of the battery cell, and the outer side mentioned above refers to the side away from the pole group 2, that is, the side exposed outside the shell 1 of the battery cell.

[0049] The lower plastic part 33 is installed between the pole 34 and the inner side of the first cover body 31, that is, the lower plastic part 33 is provided with an avoidance through hole 331, and one end of the pole 34 passes through the avoidance through hole 331 and the aforementioned installation through hole 311 in sequence and extends to the outer side of the first cover body 31; the inner surface of the first cover body 31 located on both sides of the lower plastic part 33 is provided with an insulating sheet 32; the second cover 4 is a conductive metal plate, and the second cover 4 is connected to the second pole ear 22 of the pole group 2.

[0050] Based on the structure described above, it can be known that the battery cell provided in the present application has redesigned the cover structure at both ends of the shell 1. For the first cover plate assembly 3, all lower plastic parts except the position of the pole 34 are eliminated, and only a thinner insulating sheet 32 ​​is set on the first cover plate body 31. The structure is simple and the molding process is mature. Compared with the lower plastic part 33 of a certain thickness and extending throughout the entire length of the first cover plate body 31 in the prior art, the material cost is low and the space occupied by the pole group 2 is reduced. For example, the height space can be saved by about 3-4mm, which greatly improves the space utilization rate and increases the battery cell capacity. Moreover, the insulating sheet 32 ​​is tightly attached to the first cover plate body 31, with the first cover plate body 31 as the basis, and the overall structure is not easy to deform, so the pole ear will not be stuck in the gap.

[0051] For the second cover plate 4, other components in the cover plate assembly in the prior art are eliminated, and only the structure of the conductive metal plate is retained, which can achieve an ultimate space improvement and help reduce costs.

[0052] The second cover plate 4 eliminates other components in the cover plate assembly in the prior art, and can only retain the structure of the conductive metal plate, such as the metal plate, and reduces the space occupied by the electrode group 2. For example, the height space can be saved by about 2-3mm, which greatly improves the space utilization rate, can achieve the ultimate space improvement, increase the battery cell capacity, and reduce the assembly process and reduce the cost.

[0053] It can be seen that with the redesign of the first cover plate assembly 3 and the second cover plate 4, the space occupied at both ends of the electrode group 2 is reduced, the space utilization rate is greatly improved, the ultimate space improvement can be achieved, the capacity of the entire battery cell is increased, and the material cost is greatly reduced, and the assembly process is reduced.

[0054] In this embodiment, preferably, Figure 5 and Figure 6 As shown, the battery cell further includes an end plate 5 , and the end plate 5 is mounted on one end of the electrode group 2 where the second electrode lug 22 is disposed, and the second cover plate 4 is disposed against the end plate 5 .

[0055] According to the structure described above, the end plate 5 is designed between the pole group 2 and the second cover plate 4 to support the second cover plate 4 and protect the second pole tab 22 to prevent the second pole tab 22 from being damaged by pressure.

[0056] In this embodiment, preferably, Figure 5 and Figure 6 As shown, the end plate 5 is formed with an escape space 51 penetrating through both sides thereof along a preset direction, the second pole tab 22 is disposed in the escape space 51 , and the second pole tab 22 abuts against the second cover plate 4 through the opening of the escape space 51 .

[0057] According to the structure described above, the second pole tab 22 is located in the avoidance space 51 of the end plate 5, which further protects the second pole tab 22 and prevents the second pole tab 22 from being damaged by pressure, making it safer and more reliable.

[0058] Furthermore, preferably, the end plate 5 can also be heat-fused together with the Mylar film 6 wrapped around the electrode group 2, and can be put into the shell together with the electrode group 2, thereby reducing the assembly process.

[0059] In this embodiment, preferably, Figure 3 and Figure 5 As shown, the side of the second cover plate 4 close to the pole group 2 has a planar structure and abuts against the second pole lug 22 of the pole group 2 .

[0060] According to the structure described above, the side of the second cover plate 4 close to the pole group 2 adopts a planar structure, which increases the contact area with the flattened second pole ear 22, thereby increasing the welding area, which helps to improve the stability and firmness after welding.

[0061] It should be noted that the first pole lug 21 and the second pole lug 22 are both flattened pole lug clusters, which are arranged along an inner surface parallel to the first cover plate body 31 .

[0062] In this embodiment, preferably, the second cover plate 4 is the first cover plate body 31, which has sufficient strength and hardness, light weight and good conductivity. It should be noted that the first cover plate body 31 mentioned in the foregoing and following texts refers to the first cover plate body 31 in the first cover plate assembly 3, rather than the second cover plate 4. The second cover plate 4 is referred to by its name, i.e., the second cover plate 4, in the foregoing and following texts.

[0063] It should be noted that the second cover plate 4 is not limited to the structure of the first cover plate body 31 , and other metal plates may also be used. For example, the second cover plate 4 may also be made of stainless steel.

[0064] In this embodiment, preferably, Figure 4 and Figure 8 As shown, the pole 34 includes a first connecting portion 341 and a second connecting portion 342 connected to each other; wherein the first connecting portion 341 is arranged on a side of the second connecting portion 342 close to the first cover body 31; the first connecting portion 341 is sequentially penetrated through the lower plastic part 33 and the first cover body 31; the side of the second connecting portion 342 facing away from the first cover body 31 abuts against the pole ear of the pole group 2, and is connected by welding.

[0065] According to the structure described above, the first connection part 341 extends through the first cover plate body 31 to the outside as an output structure, and the second connection part 342 serves as a connection structure with the first pole ear 21, which increases the welding area and helps to improve the firmness and stability of the welding structure. In addition, the second connection part 342 also serves to limit the first connection part 341.

[0066] Further, preferably, the first connection portion 341 and the second connection portion 342 may be an integrated structure. Of course, this is not limited to this, and the two may also be connected by welding or other methods.

[0067] Further, preferably, the second connection portion 342 is a flat plate structure with a small thickness and occupies a small space. Of course, it is not limited to this and is designed according to actual needs.

[0068] Further, preferably, the side of the second connection portion 342 facing away from the first cover plate body 31 abuts against the side of the pole ear of the pole group 2 facing away from the pole group 2, so that the welding area is large, thereby improving the stability and firmness of the welding.

[0069] In this embodiment, preferably, Figure 4 and Figure 8As shown, the first cover assembly 3 also includes a sealing ring 35, which is in a convex shape and is sleeved on the outside of the first connecting portion 341 and abuts against a side surface of the second connecting portion 342 close to the first cover body 31; the sealing ring 35 is pressed between the first cover body 31 and the first connecting portion 341 and the second connecting portion 342.

[0070] According to the structure described above, a portion of the sealing ring 35 having a convex structure extends into the mounting hole 311 of the first cover body 31, and is blocked between the first connection portion 341 and the outer wall of the inner wall of the mounting hole 311, thereby playing the role of insulation protection and sealing, while another portion of the sealing ring 35 is located in the avoidance hole 331 to block the second connection portion 342 and the inner surface of the first cover body 31 together, thereby playing the role of insulation protection and sealing.

[0071] In this embodiment, preferably, Figure 4 As shown, the lower plastic part 33 is formed with a first groove, the second connecting part 342 is installed in the first groove, and one end of the first connecting part 341 passes through the lower plastic part 33 and the first cover body 31 in sequence and extends to the outside of the first cover body 31.

[0072] According to the structure described above, the second connecting portion 342 is installed in the first groove of the lower plastic part 33, so that the pole 34 and the lower plastic part 33 are assembled more stably and firmly, and the lower plastic part 33 can cover the side of the second connecting portion 342, further playing the role of insulation protection, which is safer and more reliable.

[0073] Further, preferably, the first groove of the lower plastic part 33 is matched with the second connecting portion 342 .

[0074] Of course, the structure of the lower plastic part 33 is not limited to the above, and it can also be a flat plate structure, etc. In this case, the lower plastic part 33 will not wrap the side of the second connecting part 342, and the specific design is based on actual needs.

[0075] In this embodiment, preferably, Figure 4 and Figure 8 As shown, the first cover assembly 3 also includes a clamping member 37 and an upper plastic part 36; wherein the clamping member 37 is sleeved on one end of the pole 34 exposed to the first cover body 31, and at least part of the structure of the upper plastic part 36 is pressed between the clamping member 37 and the first cover body 31; the clamping member 37 and the pole 34 are connected by welding or riveting.

[0076] According to the structure described above, the clamping member 37 can further fix the pole 34, the lower plastic part 33 and the first cover body 31 together, making the overall structure stronger and more stable, and the upper plastic part 36 can also play the role of insulating and protecting the clamping member 37 and the first cover body 31 to avoid problems such as short circuits.

[0077] Further, preferably, both the upper plastic part 36 and the pressing member 37 are provided with avoidance through holes 331 penetrating through both sides thereof along a preset direction, so as to avoid the pole 34 .

[0078] In this embodiment, preferably, Figure 4 and Figure 8 As shown, the upper plastic part 36 is formed with a second groove, and the pressing member 37 is disposed in the second groove.

[0079] According to the structure described above, the pressing member 37 is installed in the second groove, so that the pressing member 37 and the upper plastic part 36 are assembled more firmly and stably, and it helps to improve the insulation performance. Of course, the structure of the upper plastic part 36 is not limited to the above, and other structures can also be adopted, for example, the upper plastic part 36 can be a plate-shaped structure.

[0080] In this embodiment, preferably, Figure 8 As shown, the clamping member 37 and the upper plastic part 36 are integrally molded by encapsulation and injection molding. This process is relatively mature, has high structural strength, and can be designed as a platform, thereby reducing the development cost of the cover structure.

[0081] In this embodiment, preferably, Figure 4 As shown, the clamping member 37 is connected to the pole 34 by riveting, which is a mature process with simple operation and high production efficiency, and the clamping member 37 is more firmly and stably connected to the pole 34. Of course, the connection method between the clamping member 37 and the pole 34 is not limited to the above, and the two can also be connected by other methods, such as welding.

[0082] In this embodiment, preferably, the upper plastic part 36 is provided with a limiting protrusion, the pressing member 37 is provided with a limiting groove, and the limiting protrusion is arranged in the limiting groove (not shown in the figure).

[0083] According to the structure described above, the upper plastic part 36 and the pressing member 37 are connected in an interlocking manner through the cooperation between the limiting protrusion and the limiting groove, so that the connection between the two is more stable and firm.

[0084] Further, preferably, the inner side wall of the upper plastic part 36 is provided with a limiting protrusion, and the outer side wall of the pressing member 37 is provided with a limiting groove. Of course, it is not limited to this, and can also be designed according to actual needs.

[0085] In addition, it should be noted that: the pressing member 37 may be provided with a limiting protrusion, the upper plastic part 36 may be provided with a limiting groove, and the limiting protrusion may be provided in the limiting groove.

[0086] In this embodiment, preferably, Figure 4 and Figure 8 As shown, the lower plastic part 33 is adapted to the pole 34, and thus the lower plastic part 33 is arranged only in the inner area of ​​the first cover body 31 corresponding to the size of the pole 34, while most of the remaining inner surfaces are completely replaced by the insulating sheet 32, which greatly reduces the occupied height space and material cost.

[0087] In this embodiment, preferably, the insulating sheet 32 ​​is pasted on the inner surface of the first cover body 31, which is simple and convenient to operate and improves production efficiency. Of course, it is not limited to this, and the two can also be connected by hot melting or other methods.

[0088] In this embodiment, preferably, the material of the insulating sheet 32 ​​can be one of thermoplastic polyesters such as PET, also known as polyethylene terephthalate, high-performance fluoroplastics such as PFA, also known as polyperfluoroalkoxy, and polycarbonate plastics, also known as PC. Of course, it is not limited to this, and the material of the insulating sheet 32 ​​can also be selected according to actual needs.

[0089] In this embodiment, preferably, the pole 34 is connected to the first pole lug 21 of the pole group 2 by welding, which is simple and convenient to operate, and the connection structure is firm and stable.

[0090] In this embodiment, preferably, the second cover plate 4 is connected to the second pole ear 22 of the pole group 2 by welding, which has a mature process, is simple and convenient to operate, and has a firm and stable connection structure. Of course, it is not limited to this, and other connection methods, such as gluing, etc., may also be used.

[0091] In this embodiment, preferably, the second cover plate 4 is connected to the shell 1 by welding, which has a mature process, is simple and convenient to operate, and has a firm and stable connection structure. Of course, it is not limited to this, and other connection methods, such as gluing, etc., may also be used.

[0092] In this embodiment, preferably, the first cover plate body 31 is connected to the shell 1 by welding, which has a mature process, is simple and convenient to operate, and has a firm and stable connection structure. Of course, it is not limited to this, and other connection methods, such as gluing, etc., may also be used.

[0093] In this embodiment, preferably, the battery cell further includes an explosion-proof valve (not shown in the figure), and the explosion-proof valve is arranged on the long narrow side of the shell 1 formed by its long sides and wide sides, and is connected to the interior of the shell 1.

[0094] According to the structure described above, it can be known that in the present application, an explosion-proof valve is designed on the long and narrow side of the shell 1, thereby shortening the exhaust path and facilitating rapid exhaust.

[0095] Further, preferably, the number of the explosion-proof valves is one or more, and the number of the explosion-proof valves can also be more than one, and they are sequentially spaced apart along the length direction of the shell 1 .

[0096] Further, preferably, the housing 1 has two oppositely disposed long narrow sides, and an explosion-proof valve may be provided on one of the long narrow sides, or on both of the long narrow sides, depending on actual needs.

[0097] Further, preferably, the shell 1 is in a rectangular parallelepiped shape, and its length is greater than the width and height, especially much greater than the width, so that the shell 1 is in a blade shape. Of course, it is not limited to this and can be designed according to actual needs.

[0098] Further, preferably, side plates 7 are provided on both sides of the pole group 2 along the height direction thereof, and exhaust holes are provided at positions of the side plates 7 corresponding to the explosion-proof valves.

[0099] In this embodiment, preferably, Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the first pole ear 21 is a negative pole ear, and the second pole ear 22 is a positive pole ear. In this case, the housing 1, the second cover plate 4, and the first cover plate body 31 in the first cover plate assembly 3 are all positively charged, and only the pole 34 and the pressing member 37 are negatively charged. Of course, it is not limited to the first pole ear 21, and the second pole ear 22 can also be a negative pole ear.

[0100] Further, preferably, when the first pole ear 21 is a negative pole ear and the second pole ear 22 is a positive pole ear, the second cover plate 4 is formed with an externally protruding connecting protrusion 41, and is used to connect the connecting row, and preferably, this connecting protrusion 41 can be formed by stamping. Of course, it is not limited to this and can also be designed according to actual needs.

[0101] It should be noted that the aforementioned preset direction may be the length direction of the shell 1 or the height direction of the shell 1 , etc., and is selected according to actual needs.

[0102] In addition, the type of battery cells provided in the present application is not limited to lithium batteries, but may also be other types.

[0103] 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A shell, a pole group, a first cover plate assembly and a second cover plate; wherein the pole group is arranged in the shell, and the first cover plate assembly and the second cover plate are respectively arranged at two openings of the shell along a preset direction; the first cover plate assembly includes a first cover plate body, an insulating sheet, a lower plastic part and a pole, the pole is installed on the inner side of the first cover plate body, and the pole is connected to the first pole ear of the pole group, and one end of the pole passes through the first cover plate body and extends to the outer side of the first cover plate body; The lower plastic part is installed between the pole and the inner side of the first cover body, and the inner surface of the first cover body on both sides of the lower plastic part is provided with the insulating sheet; the second cover is a conductive metal plate, and the second cover is connected to the second pole ear of the pole group.

2. The battery cell according to claim 1, characterized in that: The battery cell further includes an end plate, and the end plate is mounted on one end of the electrode group provided with a second electrode lug, and the second cover plate is disposed against the end plate.

3. The battery cell according to claim 2, characterized in that: The end plate is formed with an escape space penetrating through both sides thereof along a preset direction, the second pole tab is arranged in the escape space, and the second pole tab abuts against the second cover plate through an opening of the escape space.

4. The battery cell according to claim 1, characterized in that: A side of the second cover plate close to the pole group has a planar structure and abuts against the second pole ear of the pole group; and / or The second cover plate is the first cover plate body.

5. The battery cell according to claim 1, characterized in that: The pole includes a first connecting portion and a second connecting portion connected to each other; wherein the first connecting portion is arranged on a side of the second connecting portion close to the first cover body; the first connecting portion is sequentially penetrated through the lower plastic part and the first cover body; the side of the second connecting portion facing away from the first cover body abuts against the pole ear of the pole group and is connected by welding.

6. The battery cell according to claim 5, characterized in that: The first cover plate assembly further includes a sealing ring, which is in a convex shape and is sleeved on the outside of the first connecting portion and abuts against a side surface of the second connecting portion close to the first cover plate body; the sealing ring is press-fitted between the first cover plate body and the first connecting portion and the second connecting portion; and / or The lower plastic part is formed with a first groove, the second connecting part is installed in the first groove, and one end of the first connecting part passes through the lower plastic part and the first cover body in sequence and extends to the outside of the first cover body.

7. The battery cell according to claim 1, characterized in that: The first cover plate assembly also includes a clamping member and an upper plastic part; wherein the clamping member is sleeved on one end of the pole exposed from the first cover plate body, and at least part of the structure of the upper plastic part is pressed between the clamping member and the first cover plate body; the clamping member is connected to the pole by welding or riveting.

8. The battery cell according to claim 7, characterized in that: The upper plastic part is formed with a second groove, and the pressing member is arranged in the second groove; and / or The clamping member and the upper plastic part are integrally molded by encapsulation and injection molding; and / or The clamping member is connected to the pole by welding or riveting; and / or One of the upper plastic part and the pressing member is provided with a limiting protrusion, and the other of the upper plastic part and the pressing member is provided with a limiting groove, and the limiting protrusion is arranged in the limiting groove.

9. The battery cell according to claim 1, characterized in that: The lower plastic part is adapted to the pole; and / or The insulating sheet is adhered to the inner surface of the first cover body.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The pole is connected to the first pole lug of the pole group by welding; and / or The second cover plate is connected to the second pole lug of the pole group by welding; and / or The second cover plate is connected to the housing by welding; and / or The first cover plate body is connected to the shell by welding; and / or The battery cell further includes an explosion-proof valve, and the explosion-proof valve is arranged on the long narrow side of the shell formed by the long side and the wide side thereof, and is connected to the interior of the shell; and / or The first electrode tab is a negative electrode tab, the second electrode tab is a positive electrode tab, and the second cover plate is formed with an externally protruding connecting protrusion for connecting to an external conductive structure.

Images