Lithium battery

Abstract

The utility model relates to the technical field of batteries, in particular to a lithium battery which comprises a shell, a roll core, a cover plate assembly, a pole and a connecting piece, the roll core is arranged in the shell, and a flattened tab cluster is formed on the roll core; the opening of the shell is covered with a cover plate assembly, the pole is mounted in a through hole of the cover plate assembly, and a mounting hole is formed in the pole; the connecting piece comprises a connecting part and an inserting part which are connected with each other, and the inserting part is inserted into the mounting hole; the connecting part is positioned between the cover plate assembly and the roll core, extends to one side, far away from the roll core, of the tab cluster, and is propped against and connected with the tab cluster; or the connecting part extends to one side, close to the roll core, of the tab cluster, and abuts against and is connected with the tab cluster. Therefore, the structure of the connecting piece is redesigned, the inserting part is directly inserted into the through hole of the pole, and the connecting part can extend to the lower part of the tab cluster, so that the occupied height space is reduced, the space of the roll core is increased, and the battery capacity is improved.

Description

Technical Field

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

[0002] At present, lithium batteries are increasingly used in large-scale energy storage fields. The capacity of lithium batteries is getting larger and larger. In order to meet market demand and reduce battery costs, maximizing capacity within a limited space volume has become the anchoring goal of R&D personnel. However, in order to facilitate assembly, the connecting piece is often designed as a long sheet structure, which is folded many times during the installation process, and finally the connecting piece is folded and pressed between the cover plate and the winding core. This type of connecting piece occupies a large space, compresses the space of the winding core, and is not conducive to the battery achieving the goal of large capacity. Utility Model Content

[0003] The purpose of the present application is to provide a lithium battery, which to some extent solves the technical problem that the connecting piece of the lithium battery in the prior art is a long sheet structure, which is folded many times during the installation process. The connecting piece is finally folded and pressed between the cover plate and the winding core. The connecting piece occupies a large space, compresses the space of the winding core, and is not conducive to the battery achieving the goal of large capacity.

[0004] The present application provides a lithium battery, comprising: a shell, a winding core, a cover plate assembly, a pole and a connecting piece; wherein the shell is a structure with a hollow interior and at least one end open along its height direction, the winding core is arranged in the shell, and the winding core is formed with a flattened pole ear cluster; the opening of the shell is covered with the cover plate assembly, the pole is installed in the through hole of the cover plate assembly, and the pole is formed with a mounting hole;

[0005] The connecting piece includes a connecting portion and an inserting portion which are connected to each other, and the inserting portion is inserted into the mounting hole; the connecting portion is located between the cover plate assembly and the winding core, and the connecting portion extends to the side of the pole ear cluster away from the winding core, and abuts against and connects together, or the connecting portion extends to the side of the pole ear cluster close to the winding core, and abuts against and connects together.

[0006] In the above technical solution, further, the connecting portion and the plug-in portion form an L-shaped structure, or the connecting portion and the plug-in portion form a T-shaped structure.

[0007] In any of the above technical solutions, further, the lithium battery also includes a fixing member, which is ring-shaped and is sleeved on the outside of one end of the pole exposed to the cover plate assembly.

[0008] In any of the above technical solutions, further, the lithium battery also includes an upper plastic, which extends along the periphery of the fixing component and wraps around the outer wall of the fixing component to separate the fixing component and the cover plate assembly.

[0009] In any of the above technical solutions, further, the outer wall of the fixing component forms a limiting hole, the upper plastic forms a limiting protrusion, and the limiting protrusion is inserted into the limiting hole.

[0010] In any of the above technical solutions, further, the fixing component is provided with a rotation-stopping groove, the upper plastic is formed with a rotation-stopping protrusion, and the rotation-stopping protrusion is inserted into the rotation-stopping groove.

[0011] In any of the above technical solutions, further, the upper plastic is formed on the fixing component and the cover assembly by injection molding.

[0012] In any of the above technical solutions, further, when the connecting portion extends to the side of the flattened tab cluster close to the winding core, the lithium battery also includes insulating tape, and the insulating tape is attached to the side of the connecting portion close to the winding core.

[0013] In any of the above technical solutions, further, the fixing member is connected to the pole by welding or riveting.

[0014] In any of the above technical solutions, further, the lithium battery also includes a sealing ring, which is sleeved on the outside of the pole, and the sealing ring is compressed at the opening end of the through hole away from the winding core.

[0015] In any of the above technical solutions, further, the connecting portion is connected to the tab cluster by welding.

[0016] In any of the above technical solutions, further, the plug-in portion is not exposed at the opening end of the mounting hole away from the winding core.

[0017] In any of the above technical solutions, further, the plug-in portion is connected to the pole by welding.

[0018] In any of the above technical solutions, further, along the height direction of the pole, the mounting hole passes through both ends of the pole;

[0019] Alternatively, along the height direction of the pole, the mounting hole passes through an end of the pole close to the winding core, but does not pass through an end of the pole away from the winding core, and the plug-in portion is connected to the pole by penetration welding.

[0020] In any of the above technical solutions, further, the cover plate assembly includes a plain aluminum plate and a lower plastic, and the lower plastic is arranged on a side of the plain aluminum plate close to the winding core; the plain aluminum plate is provided with the through hole, and the lower plastic is provided with an avoidance through hole; part of the structure of the lower plastic extends into the through hole and is located between the pole and the hole wall of the through hole.

[0021] In any of the above technical solutions, further, the lower plastic includes a plurality of insulating parts, and the plurality of insulating parts are sequentially arranged along the length direction of the bare aluminum plate.

[0022] In any of the above technical solutions, further, the lithium battery also includes an explosion-proof valve, and the explosion-proof valve is installed on the bare aluminum plate, and an exhaust groove matching its width is provided on the insulating part corresponding to the explosion-proof valve, and a plurality of exhaust through holes are provided on the wall of the exhaust groove close to the winding core, and the plurality of exhaust holes are arranged in sequence along the length direction of the exhaust groove.

[0023] In any of the above technical solutions, further, the number of the winding cores is multiple, and they are arranged in parallel in sequence along the width direction of the shell, and any of the winding cores is equipped with a connecting plate, and all of the winding cores share one pole, or along the arrangement direction of the multiple winding cores, each preset number of the winding cores share one pole.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] The present application provides a lithium battery in which the structure of the connecting plate is redesigned. The connecting plate includes a connecting portion and an inserting portion, so that the inserting portion is directly inserted into the through hole of the pole, and the connecting portion can extend to the bottom of the pole ear cluster. The connecting plate does not need to be designed to be long and folded, thereby reducing the height space occupied, helping to increase the space of the winding core, and greatly improving the capacity of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 An exploded view of a lithium battery provided in an embodiment of the present application;

[0028] Figure 2 A partial cross-sectional view of a lithium battery provided in an embodiment of the present application;

[0029] Figure 3 for Figure 2 A schematic diagram of a local enlarged structure;

[0030] Figure 4 An exploded view of the cover structure of a lithium battery provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a pole provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of the structure of the connecting piece provided in the embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of a fixing member provided in an embodiment of the present application;

[0034] Figure 8 A schematic diagram of the structure of the lower plastic provided in an embodiment of the present application;

[0035] Fig. 9 A schematic diagram of the structure of the cover plate portion of a lithium battery provided in an embodiment of the present application;

[0036] Fig.10 Another structural schematic diagram of the cover portion of the lithium battery provided in an embodiment of the present application.

[0037] Reference numerals:

[0038] 1-shell, 2-winding core, 21-ear cluster, 3-cover assembly, 31-plain aluminum plate, 32-lower plastic, 321-insulating part, 3221-exhaust groove, 3222-exhaust through hole, 4-pole, 41-mounting hole, 5-connecting piece, 51-connecting part, 52-plug-in part, 6-fixing member, 61-limiting hole, 62-stop groove, 7-upper plastic, 8-insulating tape, 9-sealing ring, 10-explosion-proof valve. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Refer to the following Figures 1 to 10 A lithium battery according to some embodiments of the present application is described.

[0045] See also Figures 1 to 6 , Fig. 9 and Fig.10 As shown, an embodiment of the present application provides a lithium battery, comprising: a shell 1, a winding core 2, a cover plate assembly 3, a pole 4, and a connecting piece 5; wherein the shell 1 is a structure that is hollow inside and open at least at one end along its height direction, the winding core 2 is arranged in the shell 1, and the winding core 2 is formed with a flattened pole ear cluster 21; the opening of the shell 1 is covered with a cover plate assembly 3, the pole 4 is installed in the through hole of the cover plate assembly 3, and the pole 4 is formed with a mounting hole 41;

[0046] The connecting piece 5 includes a connecting portion 51 and an inserting portion 52 which are connected to each other, and the inserting portion 52 is inserted into the mounting hole 41; the connecting portion 51 is located between the cover plate assembly 3 and the winding core 2, and the connecting portion 51 extends to the side of the pole ear cluster 21 close to the winding core 2, and abuts against and is connected together.

[0047] According to the structure described above, the present application provides a lithium battery in which the structure of the connecting plate 5 is redesigned. The connecting plate 5 includes a connecting portion 51 and an inserting portion 52, so that the inserting portion 52 is directly inserted into the through hole of the pole 4, and the connecting portion 51 can extend to the bottom of the pole ear cluster 21. The connecting plate 5 does not need to be designed to be longer and folded, thereby reducing the height space occupied, helping to increase the space of the core 2, and greatly improving the capacity of the battery.

[0048] It should be noted that: the above-mentioned structure in which the connecting portion 51 extends to the side of the pole lug cluster 21 close to the winding core 2 is not limited, and other assembly forms can also be adopted, for example: the connecting portion 51 extends to the side of the pole lug cluster 21 away from the winding core 2, and abuts and is connected together, and the specific design is based on actual needs.

[0049] In this embodiment, preferably, Figure 3 and Figure 6 As shown, the connecting portion 51 and the plug-in portion 52 form an L-shaped structure.

[0050] According to the structure described above, the connecting piece 5 adopts an L-shaped structure, which can not only ensure the stable fit between the vertical plug-in part 52 and the pole 4, but also increase the contact area between the horizontal connecting part 51 and the pole ear, such as the welding area, thereby improving the stability and firmness of the assembly of the two, and avoiding occupying excess space. In particular, when the number of winding cores 2 is two, the two connecting pieces 5 equipped with the two winding cores 2 can be arranged back to back, making full use of the space and achieving higher integration.

[0051] Furthermore, preferably, the connecting portion 51 and the plug-in portion 52 may be an integrated structure with high overall strength and resistance to damage, or may be a split structure and connected by welding or the like.

[0052] Further, preferably, the connecting portion 51 and the plug-in portion 52 are both sheet-like structures. Of course, the present invention is not limited thereto.

[0053] It should be noted that the shape of the connecting piece 5 is not limited to the above, and it can also be other shapes. For example, the connecting piece 5 can be T-shaped, that is, the connecting portion 51 and the plug-in portion 52 form a T-shaped structure.

[0054] In this embodiment, preferably, Figure 3 , Figure 4 , Figure 7 and Fig. 9 As shown, the lithium battery further includes a fixing member 6 , which is ring-shaped and sleeved on the outside of one end of the pole 4 exposed to the cover plate assembly 3 .

[0055] According to the structure described above, the fixing member 6 plays a role in pressing the pole 4, so that the pole 4 and the cover plate assembly 3 are assembled more stably and firmly.

[0056] Further, preferably, the fixing member 6 and the pole 4 can be connected together by welding or riveting, etc., which has mature technology, simple and convenient operation, and a more stable and firmer connection structure. Of course, it is not limited to this, and other connection methods, such as gluing, etc., can also be used.

[0057] In this embodiment, preferably, Figure 4 and Fig. 9 As shown, the lithium battery further includes an upper plastic 7 , which extends along the periphery of the fixing member 6 and wraps around the outer wall of the fixing member 6 to separate the fixing member 6 from the cover plate assembly 3 .

[0058] According to the structure described above, the upper plastic 7 separates the fixing member 6 and the cover assembly 3 to play a role of insulation protection.

[0059] In this embodiment, preferably, Figure 7 As shown, the outer wall of the fixing member 6 forms a limiting hole 61 , the upper plastic 7 forms a limiting protrusion, and the limiting protrusion is inserted into the limiting hole 61 .

[0060] According to the structure described above, it can be seen that the fixing member 6 and the upper plastic 7 form an interlocking structure, so that the two are connected together more stably and firmly.

[0061] Further, preferably, the number of the limiting holes 61 is multiple and is arranged in sequence along the circumference of the fixing member 6. Correspondingly, the number of the limiting protrusions is multiple and corresponds one-to-one to the multiple limiting holes 61. Of course, this is not limited to this, and the number of the limiting protrusions and the limiting holes 61 may also be one.

[0062] Further, preferably, the limiting hole 61 is a blind hole and does not penetrate the inner wall of the fixing member 6 to prevent plastic from entering between the fixing member 6 and the pole 4. Of course, it is not limited to this. The limiting hole 61 can also be a through hole, which is designed according to actual needs.

[0063] In this embodiment, preferably, Figure 7 As shown, the fixing member 6 is provided with a rotation-stopping groove 62 , and the upper plastic 7 is formed with a rotation-stopping protrusion, and the rotation-stopping protrusion is inserted into the rotation-stopping groove 62 .

[0064] According to the structure described above, it can be known that the anti-rotation protrusion is inserted into the anti-rotation groove 62 to prevent the fixing member 6 from rotating.

[0065] Further, preferably, there are multiple anti-rotation grooves 62, and they are arranged in sequence along the circumference of the fixed component 6. Correspondingly, there are multiple anti-rotation protrusions, and they correspond one-to-one to the multiple anti-rotation grooves 62. Of course, this is not limited to this, and the number of anti-rotation grooves 62 and anti-rotation protrusions can also be one.

[0066] In this embodiment, preferably, Figure 3As shown, the upper plastic 7 is formed on the fixing member 6 and the cover assembly 3 by injection molding. By injection molding, not only can the upper plastic 7 be molded on the outside of the fixing member 6 and on the top of the cover assembly 3, but the fixing member 6, the cover assembly 3 and the pole 4 can also be further reinforced together. The overall structure is more stable and stronger, and only the limiting hole 61 and the anti-rotation groove 62 need to be reserved. After injection molding, the limiting protrusion is naturally molded in the limiting hole 61, and the anti-rotation protrusion is molded in the anti-rotation groove 62. The operation is simple and convenient, and the later assembly is avoided.

[0067] Of course, the method of molding the upper plastic 7 is not limited to the above method, and other methods may be used. For example, the upper plastic 7 may be molded first, and then the upper plastic 7 is assembled with the components.

[0068] In this embodiment, preferably, Figure 1 As shown, when the connecting portion 51 extends to the side of the flattened tab cluster 21 close to the winding core 2 , the lithium battery further includes an insulating tape 8 , and the insulating tape 8 is attached to the side of the connecting portion 51 close to the winding core 2 .

[0069] According to the structure described above, the insulating tape 8 can be blocked between the connecting portion 51 of the connecting sheet 5 and the end of the winding core 2 to avoid short circuit.

[0070] In this embodiment, preferably, Figure 3 and Figure 4 As shown, the cover plate assembly 3 includes a plain aluminum plate 31 and a lower plastic 32, and the lower plastic 32 is arranged on the side of the plain aluminum plate 31 close to the winding core 2; the plain aluminum plate 31 is provided with a through hole, and the lower plastic 32 is provided with an avoidance through hole; part of the structure of the lower plastic 32 extends into the through hole and is located between the pole 4 and the hole wall of the through hole, playing the role of insulation and protection between the pole 4 and the plain aluminum plate 31.

[0071] According to the structure described above, the bare aluminum plate 31 has sufficient strength and hardness to serve as a supporting body, and the lower plastic 32 plays a role of insulation protection.

[0072] In this embodiment, preferably, Figure 8 and Fig.10 As shown, the lower plastic 32 includes a plurality of insulating portions 321 , and the plurality of insulating portions 321 are sequentially arranged along the length direction of the bare aluminum plate 31 .

[0073] According to the structure described above, the lower plastic 32 is injection molded in sections to ensure that each section will not warp, thereby ensuring the accuracy and convenience of subsequent assembly.

[0074] In this embodiment, preferably, Figure 8As shown, the lithium battery also includes an explosion-proof valve 10, and the explosion-proof valve 10 is installed on the plain aluminum plate 31, and an exhaust groove 3221 matching its width is provided on the insulating portion 321 corresponding to the explosion-proof valve 10, and a plurality of exhaust through holes 3222 are provided on the wall of the exhaust groove 3221 close to the winding core 2, and the plurality of exhaust holes are arranged in sequence along the length direction of the exhaust groove 3221.

[0075] According to the structure described above, increasing the number of exhaust holes 3222 can improve the exhaust effect and make it safer and more reliable.

[0076] In this embodiment, preferably, Figure 8 As shown, the lithium battery further includes a sealing ring 9 , which is sleeved on the outside of the pole 4 , and the sealing ring 9 is compressed at the opening end of the through hole away from the winding core 2 .

[0077] According to the structure described above, the sealing ring 9 plays a sealing role to prevent leakage of the electrolyte.

[0078] In this embodiment, preferably, Figure 3 As shown, the connection portion 51 is connected to the tab cluster 21 by welding, the process is mature, and the connection structure is more reliable. Of course, it is not limited to this, and other methods can also be used for connection, such as hot melting or gluing.

[0079] In this embodiment, preferably, Figure 3 As shown, the plug-in portion 52 is not exposed at the open end of the mounting hole 41 away from the winding core 2, that is, the plug-in portion 52 is flush with or lower than the open end of the mounting hole 41 away from the winding core 2, to avoid electrical connection with other components when the plug-in portion 52 is exposed, causing a short circuit, etc.

[0080] In this embodiment, preferably, Figure 3 As shown, the plug-in portion 52 is connected to the pole 4 by welding, the process is mature, and the connection structure is more reliable. Of course, it is not limited to this, and other methods can also be used for connection, such as hot melting or gluing.

[0081] In this embodiment, preferably, Figure 3 As shown, along the height direction of the pole 4, the mounting hole 41 passes through both ends of the pole 4, and a common welding method can be used at this time.

[0082] Of course, not limited to this, the following structure may also be adopted, for example: along the height direction of the pole 4, the mounting hole 41 passes through the end of the pole 4 close to the winding core 2, and does not pass through the end of the pole 4 away from the winding core 2, and the plug-in portion 52 is connected to the pole 4 by penetration welding.

[0083] In this embodiment, preferably, Figure 1As shown, there are multiple winding cores 2, and they are arranged in parallel in sequence along the width direction of the shell 1. Any winding core 2 is equipped with a connecting piece 5, and all the winding cores 2 share one pole 4. Of course, it is not limited to this. It is also possible that along the arrangement direction of the multiple winding cores 2, each preset number of winding cores 2 share one pole 4, that is, every n winding cores 2 share one pole 4, n≥2, and n is a positive integer.

[0084] In this embodiment, preferably, Figure 1 , Figure 4 , Fig. 9 and Fig.10 As shown, each winding core 2 has two pole ear clusters 21 formed at the same end along its height direction, one of which is a positive pole ear cluster 21, and the other is a negative pole ear cluster 21, and each is equipped with a pole column 4, that is, a positive pole column 4 and a negative pole column 4, and the two winding cores 2 share a positive pole column 4 and a negative pole column 4, and each pole ear cluster 21 is equipped with a connecting plate 5.

[0085] Of course, not limited to the above, both ends of the winding core 2 along its height direction may be formed with pole ear clusters 21, one of which is a positive pole ear cluster 21, and the other is a negative pole ear cluster 21, then correspondingly, the aforementioned cover plate and pole column 4 structure may be provided on both sides of the shell 1, or both ends of the winding core 2 along its height direction may be formed with pole ear clusters 21, but only the pole ear cluster 21 at one end is equipped with the aforementioned pole column 4 and cover plate assembly 3, that is, only one end of the shell 1 adopts the aforementioned cover plate assembly 3, and the other end of the shell 1 can select the cover plate structure in the prior art, etc.

[0086] In addition, it should be noted that each pole 4 needs to be equipped with a sealing ring 9 , a fixing component 6 and an upper plastic 7 .

[0087] In summary, during the assembly process of the lithium battery, the tab cluster 21 of the winding core 2 is welded to the connecting portion 51 of the connecting piece 5 by, for example, ultrasonic welding. After the welding is completed, the tab is bent, and the connecting piece 5 and the winding core 2 are integrated. The plug-in portion 52 of the connecting piece 5 passes through the mounting hole 41 of the pole 4 and is laser welded to the pole 4. Of course, the assembly sequence is not limited to the above, and can also be adjusted according to actual needs, for example, the tab can be bent first and then welded to the connecting portion 51.

[0088] It should be noted that in this embodiment, the bare aluminum plate 31, the lower plastic 32, the pole 4, the fixing member 6, the sealing ring 9 and the upper plastic 7 can be assembled together, and then assembled and welded with the plug-in portion 52 of the connecting piece 5. Of course, it is not limited to this, and the assembly sequence can also be designed according to actual needs.

[0089] 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 lithium battery, characterized in that: include: A shell, a winding core, a cover plate assembly, a pole and a connecting piece; wherein the shell is a structure with a hollow interior and an opening at least at one end along its height direction, the winding core is arranged in the shell, and the winding core is formed with a flattened pole ear cluster; the opening of the shell is covered with the cover plate assembly, the pole is installed in the through hole of the cover plate assembly, and the pole is formed with a mounting hole; The connecting piece includes a connecting portion and an inserting portion which are connected to each other, and the inserting portion is inserted into the mounting hole; the connecting portion is located between the cover plate assembly and the winding core, and the connecting portion extends to the side of the pole ear cluster away from the winding core, and abuts against and connects together, or the connecting portion extends to the side of the pole ear cluster close to the winding core, and abuts against and connects together.

2. The lithium battery according to claim 1, characterized in that The connecting portion and the plug-in portion form an L-shaped structure, or the connecting portion and the plug-in portion form a T-shaped structure.

3. The lithium battery according to claim 1, characterized in that The lithium battery further comprises a fixing member, which is in a ring shape and is sleeved on the outside of one end of the pole exposed from the cover plate assembly.

4. The lithium battery according to claim 3, characterized in that: The lithium battery further includes an upper plastic, which extends along the outer circumference of the fixing member and wraps around the outer wall of the fixing member to separate the fixing member from the cap plate assembly.

5. The lithium battery according to claim 4, characterized in that: The outer wall of the fixing component forms a limiting hole, the upper plastic forms a limiting protrusion, and the limiting protrusion is inserted into the limiting hole.

6. The lithium battery according to claim 4, characterized in that: The fixing component is provided with a rotation-stopping groove, the upper plastic is formed with a rotation-stopping protrusion, and the rotation-stopping protrusion is inserted into the rotation-stopping groove.

7. The lithium battery according to claim 4, characterized in that: The upper plastic is formed on the fixing member and the cover assembly by injection molding; and / or When the connecting portion extends to the side of the flattened tab cluster close to the winding core, the lithium battery further includes insulating tape, and the insulating tape is attached to the side of the connecting portion close to the winding core.

8. The lithium battery according to claim 3, characterized in that: The fixing member is connected to the pole by welding or riveting.

9. The lithium battery according to claim 1, characterized in that: The lithium battery further comprises a sealing ring, which is sleeved on the outside of the pole and compressed at an opening end of the through hole away from the winding core; and / or The connecting portion is connected to the tab cluster by welding; and / or The plug-in portion is not exposed at the opening end of the mounting hole away from the winding core.

10. The lithium battery according to claim 1, characterized in that: The plug-in portion is connected to the pole by welding.

11. The lithium battery according to claim 10, characterized in that: Along the height direction of the pole, the mounting hole passes through both ends of the pole; Alternatively, along the height direction of the pole, the mounting hole passes through an end of the pole close to the winding core, but does not pass through an end of the pole away from the winding core, and the plug-in portion is connected to the pole by penetration welding.

12. The lithium battery according to claim 1, characterized in that: The cover plate assembly includes a plain aluminum plate and a lower plastic, and the lower plastic is arranged on a side of the plain aluminum plate close to the winding core; the plain aluminum plate is provided with the through hole, and the lower plastic is provided with an avoidance through hole; a partial structure of the lower plastic extends into the through hole and is located between the pole and the hole wall of the through hole.

13. The lithium battery according to claim 12, characterized in that: The lower plastic includes a plurality of insulating parts, and the plurality of insulating parts are sequentially arranged along the length direction of the bare aluminum plate.

14. The lithium battery according to claim 13, characterized in that: The lithium battery also includes an explosion-proof valve, and the explosion-proof valve is installed on the bare aluminum plate, and an exhaust groove matching its width is provided on the insulating portion corresponding to the explosion-proof valve, and a plurality of exhaust through holes are provided on the wall of the exhaust groove close to the winding core, and the plurality of exhaust holes are arranged in sequence along the length direction of the exhaust groove.

15. The lithium battery according to any one of claims 1 to 14, characterized in that: There are multiple winding cores, which are arranged in parallel in sequence along the width direction of the shell. Any winding core is equipped with a connecting plate, and all the winding cores share one pole, or along the arrangement direction of the multiple winding cores, each preset number of winding cores share one pole.

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