Battery cell cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate assembly and a battery cell, the battery cell cover plate assembly comprises a cover plate, a lower plastic part, an anti-explosion valve and a protection component, the anti-explosion valve is mounted on the cover plate, and the inner side and the outer side of the cover plate can be communicated through the anti-explosion valve; the lower plastic part is installed on the inner side of the anti-explosion valve, and an exhaust through hole corresponding to the anti-explosion valve is formed in the lower plastic part. And the protection component is installed on the lower plastic part and connected with the lower plastic part in a hot melting mode, and the protection component at least can shield at least part of the exhaust through holes in the preset direction and is used for preventing at least part of the electrolyte from impacting the anti-explosion valve through the exhaust through holes. Visibly, the protection component is additionally arranged, most of the exhaust through holes in the lower plastic part can be shielded, then at least part of electrolyte can be prevented from impacting the anti-explosion valve through the exhaust through holes, the anti-explosion valve is effectively prevented from being damaged or opened in advance, the protection component and the lower plastic part are connected in a hot melting mode, firmness and stability are achieved, other limiting structures do not need to be arranged, and the anti-explosion valve is convenient to use. And the structure is simplified.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery cell cover plate assembly and a battery cell. Background Art

[0002] Combined with FIGS. 1 to Figure 3 As shown, a general blade battery cell includes a pole group, an inner end plate 4', a housing, and a cover plate assembly. The pole group is installed in the housing, the cover plate assembly is installed at the open end of the housing, the inner end plate 4' is located between the end of the pole group and the cover plate assembly. The cover plate assembly includes a light aluminum plate 1', a lower plastic 3', an explosion-proof valve 2', etc. The explosion-proof valve 2' is arranged on the light aluminum plate 1' and communicates with the inner and outer sides of the light aluminum plate. The lower plastic 3' is formed with an exhaust groove and an exhaust through-hole corresponding to the explosion-proof valve 2', and the inner end plate 4' forms a corresponding exhaust cavity. It can be seen that a cavity is formed between the explosion-proof valve 2' and the inner end plate 4'. When the explosion-proof valve 2' on the cover plate of the blade battery cell is at the bottom, the electrolyte will accumulate in the cavity. When the battery cell is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve 2', causing damage to the explosion-proof valve 2', leakage of the battery cell, and premature opening of the explosion-proof valve 2'. Utility Model Content

[0003] The purpose of the present application is to provide a battery cell cover plate assembly and a battery cell, which to a certain extent solve the technical problem in the prior art that a cavity is formed between the inner end plate at the bottom of the battery cell and the explosion-proof valve. When the explosion-proof valve on the cover plate of the blade battery cell is at the bottom, the electrolyte will accumulate in the cavity. As the battery cell shakes, the electrolyte continuously impacts the explosion-proof valve, causing damage to the explosion-proof valve, leakage of the battery cell, and premature opening of the explosion-proof valve.

[0004] The present application provides a battery cell cover plate assembly, including: a cover plate, a lower plastic part, an explosion-proof valve, and a protection member; wherein, the explosion-proof valve is installed on the cover plate, and along a preset direction, the inner side of the cover plate can be connected to the outer side of the cover plate through the explosion-proof valve; the lower plastic part is installed inside the explosion-proof valve, and the lower plastic part is formed with an exhaust through-hole corresponding to the explosion-proof valve;

[0005] The protection member is installed on the lower plastic part, and the protection member is connected to the lower plastic part by a hot melting method. The protection member can at least block at least part of the exhaust through-hole along the preset direction, so as to prevent at least part of the electrolyte from impacting the explosion-proof valve through the exhaust through-hole.

[0006] In the above technical solution, further, along the preset direction, the protection member is formed with an exhaust port penetrating through both sides thereof.

[0007] In any of the above technical solutions, further, the protective member is formed with a mounting through-hole, the lower plastic part is formed with a protruding part, and the protruding part is inserted into the mounting through-hole, and the end of the protruding part exposed outside the protective member is formed into a limiting cap after heat forming.

[0008] In any of the above technical solutions, further, the lower plastic part is formed with the exhaust through-holes on at least one side of the protruding part, the protective member is formed with the exhaust ports on at least one side of the mounting through-hole, and the exhaust through-holes and the exhaust ports correspond to each other one by one.

[0009] In any of the above technical solutions, further, the lower plastic part is formed with the exhaust through-holes on both sides of the protruding part, and the protective member is formed with the exhaust ports on both sides of the mounting through-hole.

[0010] In any of the above technical solutions, further, the exhaust through-holes on both sides of the protruding part are sequentially arranged at intervals along the length direction of the explosion-proof valve; the exhaust ports on both sides of the mounting through-hole are sequentially arranged at intervals along the length direction of the explosion-proof valve.

[0011] In any of the above technical solutions, further, the protruding part is cylindrical, and the mounting through-hole is a circular hole adapted to the protruding part.

[0012] In any of the above technical solutions, further, along the thickness direction of the cover plate, the distance between the protective member and the explosion-proof valve is h, and h≥0.5mm.

[0013] In any of the above technical solutions, further, the material of the protective member is epoxy resin, metal or plastic.

[0014] The present application also provides an electric core, including a housing, a pole group, an end plate, and the electric core cover plate assembly according to any of the above technical solutions. Wherein, the pole group is installed in the housing, the electric core cover plate assembly seals the opening end of the housing, the end plate is arranged between the pole group and the electric core cover plate assembly, and the end plate is formed with an exhaust cavity and an auxiliary exhaust through-hole communicated with the exhaust cavity, and the exhaust cavity corresponds to the exhaust through-hole of the lower plastic part. Therefore, it has all the beneficial technical effects of the electric core cover plate assembly, and will not be elaborated here.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] In the cell cover plate assembly provided by the present application, a protective member is added, which can at least block at least part of the structure of the exhaust through-hole on the lower plastic part along at least the thickness direction of the cover plate. Furthermore, it can block at least part of the electrolyte from impacting the explosion-proof valve through the exhaust through-hole, playing a role in protecting the explosion-proof valve, effectively avoiding problems such as damage to the explosion-proof valve, leakage of the cell liquid, and premature opening of the explosion-proof valve, and being safer and more reliable.

[0017] In addition, the protective member is connected to the lower plastic part by hot melting, making the connection between the protective member and the lower plastic part firmer and more stable. There is no need to configure other limiting structures, etc., which simplifies the structure, reduces the cost, has a mature and simple process, and the hot melting process is relatively mature and easy to operate, greatly improving the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 use in 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, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Schematic diagram of the structure of the cover plate assembly of the blade cell provided by the prior art;

[0020] Figure 2 For Figure 1 Partial enlarged structure diagram;

[0021] Figure 3 Partial cross-sectional view of the blade cell provided by the prior art;

[0022] Figure 4 Exploded view of the cell cover plate assembly provided by the embodiment of the present application;

[0023] Figure 5 Another exploded view of the cell cover plate assembly provided by the embodiment of the present application;

[0024] Figure 6 Schematic diagram of the structure of the protective member provided by the embodiment of the present application;

[0025] Figure 7 Schematic diagram of the structure of the lower plastic part provided by the embodiment of the present application;

[0026] Figure 8 Assembly drawing of the cell cover plate assembly provided by the embodiment of the present application;

[0027] Figure 9 For Figure 8 Cross-sectional view along the A-A section;

[0028] Figure 10 For Figure 9 Cross-sectional view along the B-B section.

[0029] Reference numerals:

[0030] 1'-Light aluminum plate, 2'-Explosion-proof valve, 3'-Lower plastic, 4'-Inner end plate, 5'-Electrolyte;

[0031] 1-Cover plate, 2-Lower plastic part, 21-Exhaust groove, 22-Exhaust through hole, 23-Protrusion, 231-Limiting cap, 3-Explosion-proof valve, 4-Protective member, 41-Installation through hole, 42-Exhaust port, 5-End plate, 51-Exhaust cavity, 52-Assistive exhaust through hole, 6-Explosion-proof valve patch. Detailed implementation manners

[0032] 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.

[0033] 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.

[0034] 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 scope of protection of the present application.

[0035] 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, and 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 therefore cannot be understood as a limitation of 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.

[0036] 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.

[0037] Refer to the following Figures 4 to 10 to describe the cell cover assembly and the cell according to some embodiments of the present application.

[0038] Embodiment 1

[0039] See Figure 4 and Figure 5 As shown, an embodiment of the present application provides a cell cover assembly, including: a cover plate 1, a lower plastic part 2, an explosion-proof valve 3, and a protection member 4; wherein, the explosion-proof valve 3 is installed on the cover plate 1, and along a preset direction, the inner side of the cover plate 1 can be communicated with the outer side of the cover plate 1 via the explosion-proof valve 3, and preferably, the aforementioned preset direction is the thickness direction of the cover plate 1, and this will also be used as an example for description hereinafter. Of course, it is not limited thereto; the lower plastic part 2 is installed inside the explosion-proof valve 3, and the lower plastic part 2 is formed with an exhaust through hole 22 corresponding to the explosion-proof valve 3;

[0040] The protection member 4 is installed on the lower plastic part 2, and the protection member 4 is connected to the lower plastic part 2 by hot melting. The protection member 4 can at least block at least part of the exhaust through hole 22 along the thickness direction of the cover plate 1, and is used to block at least part of the electrolyte from impacting the explosion-proof valve 3 via the exhaust through hole 22.

[0041] According to the structure described above, in the cell cover assembly provided by the present application, the protection member 4 is added, and thus at least part of the structure of the exhaust through hole 22 on the lower plastic part 2 can be blocked along the thickness direction of the cover plate 1, and thus at least part of the electrolyte can be blocked from impacting the explosion-proof valve 3 via the exhaust through hole 22, playing a role in protecting the explosion-proof valve 3, effectively avoiding problems such as damage to the explosion-proof valve 3, liquid leakage of the cell, and premature opening of the explosion-proof valve 3, and being safer and more reliable.

[0042] In addition, the protection member 4 is connected to the lower plastic part 2 by hot melting, making the connection between the protection member 4 and the lower plastic part 2 firmer and more stable, without the need to configure other limiting structures, etc., simplifying the structure, reducing the cost, having a mature and simple process, and the hot melting process being relatively mature and easy to operate, greatly improving the assembly efficiency.

[0043] Further, preferably, along the thickness direction of the cover plate 1, the exhaust through hole 22 is disposed opposite to the explosion-proof valve 3. Of course, it is not limited thereto, and partial structures can also be staggered, etc., and it is specifically designed according to actual needs.

[0044] Further, preferably, the lower plastic part 2 is formed with exhaust grooves 21, and exhaust through-holes 22 as described above are formed at the bottoms of the exhaust grooves 21. Preferably, the two exhaust through-holes 22 described below are provided with the same exhaust groove 21. Of course, not limited to the structure where the above-mentioned exhaust groove 21 and exhaust through-hole 22 coexist, an exhaust recess may not be provided, and the exhaust through-hole 22 may be directly opened, which is specifically designed according to actual needs.

[0045] It should be noted that: the inner side of the cover plate 1 refers to the side close to the electrode group, and the outer side of the cover plate 1 refers to the side far from the electrode group, that is, the side exposed outside the housing of the battery cell.

[0046] In this embodiment, preferably, as Figure 6 shown, along the thickness direction of the cover plate 1, the protective member 4 is formed with exhaust ports 42 penetrating through both sides thereof.

[0047] According to the structure described above, when the battery cell undergoes thermal runaway, it can exhaust gas through the exhaust ports 42 on the protective member 4, improving safety and reliability.

[0048] In this embodiment, preferably, as Figure 7 shown, the protective member 4 is formed with mounting through-holes 41, the lower plastic part 2 is formed with a convex portion 23, and the convex portion 23 is inserted into the mounting through-holes 41. And the exposed end of the convex portion 23 outside the protective member 4 is heated and then pressure is applied to form a limit cap 231.

[0049] According to the structure described above, through the cooperation of the convex portion 23 and the mounting through-holes 41, the installation and positioning of the protective member 4 and the lower plastic part 2 can be realized. Further, the exposed end of the convex portion 23 outside the protective member 4 is heated, and then pressure is applied, so that the exposed end of the convex portion 23 forms a limit cap 231 with a size exceeding the mounting through-hole 41. The limit cap 231 can press the protective member 4, so that the protective member 4 and the lower plastic part 2 are firmly and stably assembled together, and the operation is simple and convenient, without designing other limiting and connecting structures, etc.

[0050] In this embodiment, preferably, as Figure 7 shown, exhaust through-holes 22 are formed on both sides of the lower plastic part 2 where the convex portion 23 is located, and exhaust ports 42 are formed on both sides of the protective member 4 where the mounting through-holes 41 are located, and the exhaust through-holes 22 on both sides correspond to the exhaust through-holes 22 on both sides one by one.

[0051] According to the structure described above, exhaust ports 42 are provided on both sides of the protective member 4, and two exhaust through-holes 22 are designed at the corresponding positions of the lower plastic part 2, so that two exhaust channels are formed on both sides of the convex portion 23, improving the exhaust effect during thermal runaway, effectively suppressing thermal runaway, and being safer and more reliable.

[0052] It should be noted that: not limited to the above "vent holes 22 are formed on both sides of the convex portion 23 of the lower plastic part 2, and vent ports 42 are formed on both sides of the mounting through hole 41 of the protective member 4", other structures can also be adopted. For example: vent holes 22 are formed on one side of the convex portion 23 of the lower plastic part 2, and vent ports 42 are formed on multiple sides such as three sides or four sides of the mounting through hole 41 of the protective member 4, or vent holes 22 are formed on multiple sides such as three sides or four sides of the convex portion 23 of the lower plastic part 2, and vent ports 42 are formed on multiple sides such as three sides or four sides of the mounting through hole 41 of the protective member 4.

[0053] In this embodiment, preferably, as Figures 5 to 7 shown, the vent holes 22 on both sides of the convex portion 23 are sequentially arranged at intervals along the length direction of the explosion-proof valve 3; the vent ports 42 on both sides of the mounting through hole 41 are sequentially arranged at intervals along the length direction of the explosion-proof valve 3.

[0054] According to the structure described above, generally, the explosion-proof valve 3 has a waist-shaped structure with a small width. Therefore, in order to exhaust air over a large area, the vent holes 22 on both sides of the convex portion 23 are sequentially arranged at intervals along the length direction of the explosion-proof valve 3. Correspondingly, the vent ports 42 on both sides of the mounting through hole 41 are also sequentially arranged at intervals along the length direction of the explosion-proof valve 3, greatly improving the exhaust effect.

[0055] Furthermore, preferably, the length direction of the explosion-proof valve 3, the length direction of the lower plastic part 2, and the length direction of the cover plate 1 are the same. Of course, it is not limited to this, and it can also be designed according to actual needs.

[0056] It should be noted that: not limited to the above "along the length direction of the explosion-proof valve 3, vent holes 22 are provided on both sides of the convex portion 23, and correspondingly, vent ports 42 are provided on both sides of the mounting through hole 41", vent holes 22 can also be provided only on one side of the convex portion 23 along the length direction or width direction of the explosion-proof valve 3, and correspondingly, vent ports 42 are provided on one side of the mounting through hole 41, which is specifically selected according to actual needs.

[0057] In addition, the explosion-proof valve 3 is not limited to the above waist-shaped structure, and other shapes can also be selected, which is specifically selected according to actual needs.

[0058] Furthermore, preferably, the number of convex portions 23 is one. Of course, multiple convex portions 23 can also be designed between two vent holes 22, and correspondingly, multiple mounting through holes 41 need to be provided, that is, multiple hot melting points are set to improve the firmness and stability of the connection between the protective member 4 and the lower plastic part 2.

[0059] In this embodiment, preferably, as Figure 6 andFigure 7 As shown, the protruding part 23 is cylindrical, and the mounting through hole 41 is a circular hole adapted to the protruding part 23.

[0060] According to the structure described above, using a cylindrical protruding part 23 and a circular mounting through hole 41 facilitates assembly, helps improve assembly accuracy, and in addition, has regular shapes and is convenient for machining and manufacturing.

[0061] It should be noted that: the shapes of the protruding part 23 and the mounting through hole 41 are not limited to the above, and other shapes can also be used. For example: the protruding part 23 can also be prismatic, and the mounting through hole 41 is a polygonal hole adapted to the protruding part 23, which is specifically designed according to actual needs.

[0062] In this embodiment, preferably, as Figures 8 to 10 shown, along the thickness direction of the cover plate 1, the distance between the protective member 4 and the explosion-proof valve 3 is h, and h≥0.5mm.

[0063] According to the structure described above, a certain gap is formed between the protective member 4 and the explosion-proof valve 3, which can effectively prevent the explosion-proof valve 3 from being damaged during the assembly of the protective member 4.

[0064] It should be noted that: the range of the distance h between the protective member 4 and the explosion-proof valve 3 along the thickness direction of the cover plate 1 is not limited to the above, and can also be set according to actual needs.

[0065] In this embodiment, preferably, the material of the protective member 4 is epoxy resin, metal or plastic such as PP, PET or PE, etc., which is specifically designed according to actual needs.

[0066] In this embodiment, preferably, as Figure 5 shown, the protective member 4 is a rectangular plate, and its length direction is the same as that of the explosion-proof valve 3.

[0067] According to the structure described above, designing the protective member 4 as a rectangular plate with its length direction the same as that of the explosion-proof valve 3 not only meets the shielding requirements but also has regular shapes and is convenient for machining and manufacturing. Of course, the shape of the protective member 4 is not limited to this, and it can also be other shapes such as circular, cross-shaped or I-shaped, etc., which are specifically designed according to actual needs.

[0068] In this embodiment, preferably, as Figure 4 shown, this cover plate 1 assembly further includes an explosion-proof valve patch 6, which is pasted on the side of the cover plate 1 away from the lower plastic part 2, so as to play a role in protecting the explosion-proof valve 3.

[0069] It should be noted that: the cell cover plate assembly provided in this application can be applied to blade cells or square shell cells, etc., which is specifically selected according to actual needs.

[0070] In addition, the inner side of the cover plate 1 refers to the side of the cover plate 1 close to the battery cell, and the outer side of the cover plate 1 refers to the side of the cover plate 1 away from the battery cell, that is, the side exposed outside the housing of the battery cell.

[0071] Embodiment 2

[0072] Embodiment 2 of the present application further provides a battery cell, including the battery cell cover plate assembly described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of this battery cell cover plate assembly, and the same technical features and beneficial effects will not be repeated.

[0073] In this embodiment, preferably, as Figure 4 , Figure 5 , Figures 8 to 10 shown, the battery cell further includes a housing, an electrode assembly, and an end plate 5; wherein, the electrode assembly is installed in the housing, and the battery cell cover plate assembly seals the open end of the housing, playing a role in closing the opening of the housing;

[0074] The end plate 5 is arranged between the electrode assembly and the battery cell cover plate assembly, and the end plate 5 is formed with an exhaust cavity 51 and an auxiliary exhaust through hole 52 communicating with the exhaust cavity 51. The exhaust cavity 51 corresponds to the exhaust through hole 22 of the lower plastic part 2 and is used for exhausting gas during thermal runaway. The end plate 5 plays a role in protecting the electrode assembly, supporting the cover plate 1, and forming an exhaust channel.

[0075] Furthermore, preferably, along the thickness direction of the cover plate 1, the exhaust cavity 51 is arranged opposite to the exhaust through hole 22 of the lower plastic part 2. The electrolyte accumulated in the exhaust cavity 51 will impact the explosion-proof valve 3 when shaking. In the present application, a protective member 4 is arranged at the position corresponding to the exhaust through hole 22, so that the protective member 4 blocks most of the liquid in the exhaust cavity 51 from impacting the explosion-proof valve 3 through the exhaust through hole 22. Of course, part of the structures of the exhaust cavity 51 and the exhaust through hole 22 of the lower plastic part 2 can also be staggered, etc., which is specifically designed according to actual needs.

[0076] It should be noted that: the housing may be formed with an open end, and the aforementioned battery cell cover plate assembly may be installed at this open end. The housing may also be formed with two open ends, and at least one of the two open ends is installed with the aforementioned battery cell cover plate assembly, which is specifically designed according to actual needs.

[0077] 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 described 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 cover assembly, characterized in that: include: A cover plate, a lower plastic part, an explosion-proof valve and a protective member; wherein the explosion-proof valve is installed on the cover plate, and along a preset direction, the inner side of the cover plate can be connected to the outer side of the cover plate via the explosion-proof valve; the lower plastic part is installed on the inner side of the explosion-proof valve, and the lower plastic part is formed with an exhaust through hole corresponding to the explosion-proof valve; The protective component is installed on the lower plastic part, and the protective component is connected to the lower plastic part by hot melting. The protective component can at least block at least part of the exhaust hole along the preset direction, so as to prevent at least part of the electrolyte from impacting the explosion-proof valve through the exhaust hole.

2. The battery cover assembly according to claim 1, characterized in that: The protection member is formed with exhaust ports penetrating through both sides thereof along the preset direction.

3. The battery cover assembly according to claim 2, characterized in that: The protective component is formed with a mounting through hole, the lower plastic part is formed with a protrusion, and the protrusion is inserted into the mounting through hole, and the end of the protrusion exposed from the protective component is formed into a limiting cap after being heated and molded.

4. The battery cover assembly according to claim 3, characterized in that: The exhaust through hole is formed on at least one side of the lower plastic part located at the protruding portion, the exhaust port is formed on at least one side of the protective component located at the mounting through hole, and the exhaust through hole corresponds to the exhaust port one by one.

5. The battery cover assembly according to claim 4, characterized in that: The exhaust through holes are formed on both sides of the lower plastic part located at the protruding portion, and the exhaust ports are formed on both sides of the protective component located at the installation through hole.

6. The battery cover assembly according to claim 5, characterized in that: The exhaust through holes on both sides of the protruding portion are sequentially spaced apart along the length direction of the explosion-proof valve; the exhaust ports on both sides of the mounting through hole are sequentially spaced apart along the length direction of the explosion-proof valve.

7. The battery cover assembly according to claim 3, characterized in that: The protrusion is cylindrical, and the mounting through hole is a circular hole matched with the protrusion.

8. The battery cover assembly according to claim 1, characterized in that: Along the thickness direction of the cover plate, the distance between the protection component and the explosion-proof valve is h, and h≥0.5 mm.

9. The battery cell cover plate assembly according to claim 1, characterized in that: The material of the protective component is epoxy resin, metal or plastic.

10. A battery cell, characterized in that: It comprises a shell, a pole group, an end plate and a battery cell cover assembly as described in any one of claims 1 to 9; wherein the pole group is installed in the shell, the battery cell cover assembly is sealed on the open end of the shell, the end plate is arranged between the pole group and the battery cell cover assembly, and the end plate is formed with an exhaust cavity and an auxiliary exhaust through hole connected to the exhaust cavity, and the exhaust cavity corresponds to the exhaust through hole of the lower plastic part.

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