Battery cover plate and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cover plate and a battery, the battery cover plate comprises a cover plate body and a pole assembly, and the cover plate body is provided with a pole penetrating hole penetrating through the cover plate body along a first direction. The pole assembly comprises a first plate part and a second plate part, the first plate part and the second plate part are arranged on the two sides of the plate body in the first direction, the second plate part is provided with a threaded column extending in the first direction, and the threaded column penetrates through the column penetrating hole. An inner threaded hole extending in the first direction is formed in the side, facing the second plate part, of the first plate part, and the first plate part and the second plate part are in threaded connection through the threaded column and the threaded hole. According to the battery cover plate and the battery provided by the invention, the distance between the first plate part and the second plate part can be flexibly adjusted through the knob threaded column, so that the pole assembly and the battery cover plate are detachable.

Description

Technical Field

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

[0002] As lithium-ion battery technology matures, it is widely used as a power battery in electric vehicles and energy storage. The performance and safety requirements for lithium-ion batteries are increasing. The lithium-ion battery cover is a core component of the battery, and its structural design is crucial to the battery cell.

[0003] Today's lithium battery cover is usually provided with a pole for circuit transmission. The pole includes a pole cover, a pole base and a pole body. The pole cover and the pole base are usually fixedly connected to the two ends of the pole body (for example, welding, riveting). On the one hand, this makes the distance between the pole cover and the pole base fixed and cannot be adjusted, resulting in a low assembly tolerance of the lithium battery cover. If the distance between the pole cover and the pole base is too large, it is easy to cause insufficient sealing between the pole and the lithium battery cover, resulting in battery leakage; if the distance between the pole cover and the pole base is too small, the pole cover and the pole base are very likely to squeeze out the plastic sealing parts (for example, upper plastic, sealing ring or lower plastic) between the pole cover and the pole base; on the other hand, once the pole is damaged during the assembly process, the entire lithium battery cover faces the risk of being scrapped as a whole, causing waste. Utility Model Content

[0004] The purpose of this application is to provide a battery cover and a battery, so as to solve, to a certain extent, the technical problems existing in the prior art that the assembly tolerance of the lithium battery cover is low and once the pole is damaged during the assembly process, the entire lithium battery cover faces the risk of being scrapped as a whole, resulting in waste.

[0005] According to a first aspect of the present application, a battery cover is provided, comprising a cover body and a pole assembly, wherein the cover body is provided with a through-hole penetrating the cover body along a first direction;

[0006] The pole assembly includes a first plate portion and a second plate portion, wherein the first plate portion and the second plate portion are both arranged on both sides of the plate body in the first direction, and the second plate portion is provided with a threaded column extending along the first direction, and the threaded column passes through the through-column hole;

[0007] An internal threaded hole extending along the first direction is provided on one side of the first plate portion facing the second plate portion, and both the first plate portion and the second plate portion are threadedly connected to the internal threaded hole via the threaded column.

[0008] Preferably, the second plate portion includes a second plate body and a stud connection portion, and the second plate body is provided with a connection hole penetrating the second plate body along the first direction;

[0009] The stud connection portion includes a limiting head and the threaded column fixedly connected to each other, and the limiting head can be clamped in the connection hole.

[0010] Preferably, a knob groove is provided on the side of the limit head facing away from the threaded column;

[0011] And / or, the second plate portion is further provided with a limiting groove, the limiting groove is provided at the edge of the connecting hole and is communicated with the connecting hole.

[0012] Preferably, the first plate portion includes a first plate body and a connecting column extending along the first direction, the connecting column is provided on the side of the first plate body facing the second plate body, the connecting column can extend into the through-column hole, and the internal threaded hole is provided on the connecting column.

[0013] Preferably, the outer diameter of the connecting column is greater than 5 mm;

[0014] And / or, a dimension of the first plate in the first direction is greater than 1.5 mm.

[0015] Preferably, it also includes:

[0016] a second plastic part, at least partially disposed between the cover body and the second plate portion;

[0017] a first plastic part, at least partially disposed between the cover body and the first plate portion;

[0018] The insulating ring is arranged in the column hole and sleeved on the outer side of the pole assembly.

[0019] Preferably, the second plate portion is arranged on the inner side of the cover body, and the first plate portion is arranged on the outer side of the cover body;

[0020] It also includes a heat insulation portion, which is arranged between the first plate portion and the first plastic part.

[0021] Preferably, the cover body is further provided with an explosion-proof opening penetrating the cover body along the first direction;

[0022] The battery cover is further provided with a limiting protrusion fixedly connected to the cover body, the limiting protrusion being provided along the edge of the explosion-proof opening, the limiting protrusion protruding toward the outside of the cover body along the first direction, and at least a portion of the limiting protrusion extending toward the middle of the explosion-proof opening;

[0023] The battery cover further includes an explosion-proof valve and a fixed pressure ring. The explosion-proof valve is arranged in the explosion-proof opening and is press-fitted between the fixed pressure ring and at least a portion of the limiting protrusion.

[0024] Preferably, it further comprises a sealing rubber ring, wherein the sealing rubber ring is arranged on the outside of the explosion-proof valve and is pressed between the explosion-proof valve and the inner wall of the explosion-proof port;

[0025] And / or, the fixed pressure ring includes a support ring and a crossbeam, the support ring is adapted to the shape of the explosion-proof opening, the crossbeam is arranged in the support ring, and both ends of the crossbeam are fixedly connected to different positions of the support ring.

[0026] According to the second aspect of the present application, a battery is provided, comprising the battery cover described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery cover, which will not be described in detail here.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] The battery cover provided by the present application is provided with a threaded column extending in a first direction on the second plate portion, and an internal threaded hole extending in the first direction on the side of the first plate portion facing the second plate portion. In this way, the first plate portion and the second plate portion can be threadedly connected through the threaded column and the threaded hole. On the one hand, the distance between the first plate portion and the second plate portion can be flexibly adjusted by turning the threaded column, effectively avoiding insufficient sealing between the pole and the lithium battery cover plate or the pole cover plate and the pole bottom plate squeezing out the plastic sealing part between the pole cover plate and the pole bottom plate; on the other hand, once the pole is damaged during the assembly process, the first plate portion and the second plate portion can be disassembled by turning the threaded column, thereby realizing the detachability of the pole assembly and the battery cover plate.

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. 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 following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 A schematic diagram of the exploded structure of the battery cover provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of another exploded structure of a battery cover provided in an embodiment of the present application;

[0033] Figure 3 A schematic diagram of the cross-section structure of a battery cover provided in an embodiment of the present application;

[0034] Figure 4 for Figure 3 The enlarged structural diagram of the battery cover at position A is provided;

[0035] Figure 5 for Figure 3 The enlarged structural diagram of the battery cover at position B is provided;

[0036] Figure 6 A schematic diagram of the axonometric structure of a battery cover provided in an embodiment of the present application;

[0037] Figure 7 Another isometric structural diagram of the battery cover provided in an embodiment of the present application;

[0038] Figure 8 A schematic front view of the second plate provided in an embodiment of the present application;

[0039] Figure 9 This is a schematic diagram of the axonometric structure of the first plate portion provided in an embodiment of the present application;

[0040] Figure 10 A schematic diagram of the axonometric structure of a stud connection portion provided in an embodiment of the present application;

[0041] Figure 11 This is a schematic diagram of the cross-sectional structure of the first plate body provided in an embodiment of the present application.

[0042] Reference numerals:

[0043] 11-first plate portion; 111-first plate body; 112-connecting column; 1121-internal threaded hole; 12-second plate portion; 121-stud connecting portion; 1211-threaded column; 1212-limiting head; 1213-knob slot; 122-second plate body; 1221-connecting hole; 1222-limiting slot; 2-cover plate body; 21-through-column hole; 22-explosion-proof port; 23-limiting ridge; 3-explosion-proof valve; 31-sealing rubber ring; 32-fixing pressure ring; 41-first plastic part; 42-second plastic part; 43-insulating ring; 5-thermal insulation part.

[0044] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0045] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0046] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0047] 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.

[0048] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0050] Refer to the following Figures 1 to 11 The battery cover and battery according to some embodiments of the present application are described.

[0051] See also Figures 1 to 11As shown, an embodiment of the first aspect of the present application provides a battery cover, which includes a cover body 2 and a pole assembly. The cover body 2 is provided with a through-hole 21 that penetrates the cover body along a first direction F1. The pole assembly includes a first plate portion 11 and a second plate portion 12. The first plate portion 11 and the second plate portion 12 are both arranged on both sides of the plate body in the first direction F1. The second plate portion 12 is provided with a threaded column 1211 extending along the first direction F1, and the threaded column 1211 penetrates the through-hole 21. The side of the first plate portion 11 facing the second plate portion 12 is provided with an internal threaded hole 1121 extending along the first direction F1. The first plate portion 11 and the second plate portion 12 are both threadedly connected to the threaded hole via the threaded column 1211.

[0052] According to the battery cover provided by the above technical features, a threaded column 1211 extending along the first direction F1 is provided on the second plate portion 12, and an internal threaded hole 1121 extending along the first direction F1 is provided on the side of the first plate portion 11 facing the second plate portion 12. In this way, the first plate portion 11 and the second plate portion 12 can be threadedly connected to the threaded hole through the threaded column 1211. On the one hand, the distance between the first plate portion 11 and the second plate portion 12 can be flexibly adjusted by the knob threaded column 1211, effectively avoiding insufficient sealing between the pole and the lithium battery cover or the pole cover and the pole bottom plate squeezing out the plastic sealing part located between the pole cover and the pole bottom plate; on the other hand, once the pole is damaged during the assembly process, the first plate portion 11 and the second plate portion 12 can be disassembled by the knob threaded column 1211, thereby realizing the detachability of the pole assembly and the battery cover.

[0053] like Figures 1 to 7 As shown, F1 shown in the figure may be an example of the first direction F1. For ease of description, two directions perpendicular to each other on a plane perpendicular to the first direction F1 are defined as a second direction F2 and a third direction F3. F2 shown in the figure may be an example of the second direction F2, and F3 shown in the figure may be an example of the third direction F3.

[0054] like Figures 1 to 7 The example of the battery cover being applicable to a square-cased battery is shown. Preferably, the first direction F1 may be parallel to the length direction of the square-cased battery, the second direction F2 may be parallel to the thickness direction of the square-cased battery, and the third direction F3 may be parallel to the width direction of the square-cased battery.

[0055] However, it is not limited thereto. As long as the pole assembly and the cover body 2 can be detachably connected, the battery cover is not limited to the example shown in the figure. The battery cover can also be applied to cylindrical batteries or other special-shaped batteries.

[0056] Preferably, if Figures 1 to 4As shown, the second plate portion 12 may include a second plate body 122 and a stud connection portion 121. The second plate body 122 is provided with a connection hole 1221 extending through the second plate body 122 along the first direction F1. The stud connection portion 121 may include a stopper 1212 and a threaded post 1211 fixedly connected to each other, with the stopper 1212 capable of being locked into the connection hole 1221. This separate arrangement of the second plate body 122 and the stud connection portion 121 not only facilitates the connection between the second plate body 122 and the first plate body 111, but also facilitates the operation of the stud connection portion 121 by turning the knob.

[0057] Preferably, if Figure 10 As shown, the side of the limit head 1212 facing away from the threaded column 1211 is provided with a knob groove 1213 to facilitate the knob operation of the threaded column 1211. Figure 10 An example is shown in which the knob groove 1213 is in the shape of a cross, but it is not limited thereto. As long as the knob of the threaded column 1211 can be driven, the knob groove 1213 can also be in the shape of a triangle, a pentagon, an I or other shapes.

[0058] Preferably, if Figure 8 As shown, the second plate portion 12 can also be provided with a limiting groove 1222, which is provided at the edge of the connecting hole 1221 and is connected to the connecting hole 1221. In this way, the limiting head 1212 and the second plate portion 12 can be locally spot welded through the limiting groove 1222 to achieve temporary fixation of the stud connection portion 121 and the second plate portion 12 in the circumferential direction, effectively avoiding the threaded column 1211 from being disengaged during the use of the battery. It should be noted that the above-mentioned temporary fixation can be understood as the connection between the limiting head 1212 and the second plate portion 12 at the local spot welding position (only to prevent the threaded column 1211 from rotating relative to the second plate portion 12) can be disconnected, that is, once the pole assembly needs to be disassembled, the local spot welding position can be disconnected under the action of the knob force applied to the knob groove 1213.

[0059] Preferably, if Figures 1 to 4 、 Figure 9 and Figure 11 As shown, the above-mentioned first plate portion 11 may include a first plate body 111 and a connecting column 112 extending along the first direction F1. The connecting column 112 is provided on the side of the first plate body 111 facing the second plate body 122. The connecting column 112 can extend into the through-column hole 21, and the internal threaded hole 1121 is provided in the connecting column 112. In this way, the internal threaded hole 1121 is provided in the connecting column 112, which effectively compresses the thickness of the second plate body 122 and reduces the space occupied by the pole assembly.

[0060] Preferably, if Figure 11As shown, the outer diameter of the connecting column 112 may be greater than 5 mm to ensure the strength of the connecting column 112 .

[0061] Preferably, if Figure 11 As shown, the dimension of the first plate body 111 in the first direction F1 may be greater than 1.5 mm to ensure the strength of the first plate body 111 .

[0062] Preferably, if Figures 1 to 4 As shown, the second plate portion 12 is arranged on the inner side of the cover body 2, and the first plate portion 11 is arranged on the outer side of the cover body 2. In this way, the first plate portion 11 is arranged on the outer side of the battery so that the smooth and flat surface of the first plate body 111 is arranged on the outer surface of the pole assembly, which facilitates the external connection of the pole assembly, effectively increases the flow area of ​​the pole assembly, and improves the electrical transmission capacity of the pole assembly.

[0063] However, it is not limited to this. As long as the first plate portion 11 and the second plate portion 12 can be detachably connected, as not shown in the figure, the second plate portion 12 can also be arranged on the outside of the cover body 2, and the first plate portion 11 can also be arranged on the inside of the cover body 2.

[0064] In an embodiment, Figures 1 to 4 As shown, preferably, the battery cover may further include an insulating assembly for insulating both the cover body 2 and the pole assembly to prevent the cover body 2 from leaking electricity.

[0065] Preferably, if Figures 1 to 4 As shown, the insulating assembly may include a second plastic component 42 , which is at least partially disposed between the cover body 2 and the second plate portion 12 to provide insulation between the second plate portion 12 and the cover body 2 .

[0066] Preferably, if Figures 1 to 4 As shown, the second plastic component 42 can be attached to the inner side of the cover body 2 .

[0067] Similarly, if Figures 1 to 4 As shown, the above-mentioned insulating assembly may further include a first plastic part 41 , at least a portion of which is disposed between the cover body 2 and the first plate portion 11 to provide insulation between the first plate portion 11 and the cover body 2 .

[0068] Preferably, if Figures 1 to 4 As shown, the first plastic component 41 may be covered on a side of the first plate body 111 facing the second plate portion 12 .

[0069] Preferably, if Figures 1 to 4As shown, the above-mentioned insulating assembly may further include an insulating ring 43, which is arranged in the through-hole 21 and sleeved on the outside of the pole assembly to be used for insulating the portion of the pole assembly in the through-hole 21 from the cover body 2.

[0070] Preferably, if Figure 4 As shown, both ends of the insulating ring 43 in the first direction F1 are connected to the second plastic component 42 and the first plastic component 41 respectively, so as to ensure the completeness of the insulation of the insulating assembly to the pole assembly.

[0071] Preferably, if Figure 1 and Figure 2 As shown, the battery cover plate may further include a heat insulating portion 5, which is disposed between the first plate portion 11 and the first plastic component 41. Thus, during the welding process between the first plate portion 111 and the external wire, the heat insulating portion 5 can effectively prevent the first plastic component 41 from being damaged by the welding heat.

[0072] Optionally, the thermal insulation part 5 may be a thermal insulation pad, a thermal insulation sheet, etc.

[0073] In an embodiment, Figures 1 to 3 、 Figure 5 、 Figure 6 As shown, the cover body 2 may also be provided with an explosion-proof opening 22 extending through the cover body 2 along a first direction F1. The battery cover may also be provided with a limiting flange 23 fixedly connected to the cover body 2. The limiting flange 23 is arranged along the edge of the explosion-proof opening 22, protruding outward from the cover body 2 along the first direction F1, and at least a portion of the limiting flange 23 extends toward the center of the explosion-proof opening 22. The battery cover may also include an explosion-proof valve 3 and a fixed pressure ring 32. The explosion-proof valve 3 is disposed within the explosion-proof opening 22 and is press-fitted between the fixed pressure ring 32 and at least a portion of the limiting flange 23. In this way, the limiting effect of the fixed pressure ring 32 and the limiting flange 23 effectively secures the battery cover to the explosion-proof valve 3, thereby replacing the current method of welding the limiting flange 23 and the explosion-proof valve 3. This saves the welding process and avoids the impact of welding stress on the explosion-proof valve 3.

[0074] Preferably, if Figures 1 to 3 As shown, the cover body 2 can extend along a third direction F3, and the pole assembly and the explosion-proof opening 22 can be spaced apart in the third direction F3 to adapt to the structure of the cover body 2.

[0075] Preferably, if Figure 1 and Figure 2 As shown, the above-mentioned limiting ridge 23 can be integrally connected with the cover body 2. Optionally, both the limiting ridge 23 and the cover body 2 can be obtained by stamping.

[0076] Preferably, if Figure 5 As shown, the battery cover plate may further include a sealing rubber ring 31, which may be clamped on the outside of the explosion-proof valve 3 and pressed between the explosion-proof valve 3 and the inner wall of the explosion-proof opening 22, thereby effectively achieving sealing between the battery cover plate and the explosion-proof valve 3.

[0077] Preferably, if Figure 1 and Figure 2 As shown, the above-mentioned fixed pressure ring 32 may include a support ring and a cross beam. The above-mentioned support ring may be adapted to the shape of the explosion-proof opening 22 to achieve a clamping connection between the fixed pressure ring 32 and the explosion-proof opening 22. The above-mentioned cross beam may be arranged in the support ring, and the two ends of the cross beam are respectively fixedly connected to different positions of the support ring to improve the supporting strength of the support ring.

[0078] The embodiment of the second aspect of the present application further provides a battery, comprising the battery cover described in any of the above embodiments, and thus having all the beneficial technical effects of the battery cover, which will not be repeated here.

[0079] Preferably, although not shown in the figures, the battery may further include a shell, and the battery cover may be arranged to cover the end portion of the shell in the first direction F1.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover, characterized in that: It includes a cover plate body and a pole assembly, wherein the cover plate body is provided with a through-hole penetrating the plate body along a first direction; The pole assembly includes a first plate portion and a second plate portion, wherein the first plate portion and the second plate portion are both arranged on both sides of the plate body in the first direction, and the second plate portion is provided with a threaded column extending along the first direction, and the threaded column passes through the through-column hole; An internal threaded hole extending along the first direction is provided on one side of the first plate portion facing the second plate portion, and both the first plate portion and the second plate portion are threadedly connected to the internal threaded hole via the threaded column.

2. The battery cover according to claim 1, characterized in that: The second plate portion includes a second plate body and a stud connection portion, and the second plate body is provided with a connection hole penetrating the second plate body along the first direction; The stud connection portion includes a limiting head and the threaded column fixedly connected to each other, and the limiting head can be clamped in the connection hole.

3. The battery cover according to claim 2, characterized in that: A knob groove is provided on a side of the limit head facing away from the threaded column; And / or, the second plate portion is further provided with a limiting groove, the limiting groove is provided at the edge of the connecting hole and is communicated with the connecting hole.

4. The battery cover according to claim 2, characterized in that: The first plate portion includes a first plate body and a connecting column extending along the first direction. The connecting column is provided on a side of the first plate body facing the second plate body. The connecting column can extend into the through-column hole. The internal threaded hole is provided on the connecting column.

5. The battery cover according to claim 4, characterized in that: The outer diameter of the connecting column is greater than 5 mm; And / or, a dimension of the first plate in the first direction is greater than 1.5 mm.

6. The battery cover according to any one of claims 1 to 5, characterized in that: Also includes: a second plastic part, at least partially disposed between the cover body and the second plate portion; a first plastic part, at least partially disposed between the cover body and the first plate portion; The insulating ring is arranged in the column hole and sleeved on the outer side of the pole assembly.

7. The battery cover according to claim 6, characterized in that: The second plate portion is arranged on the inner side of the cover plate body, and the first plate portion is arranged on the outer side of the cover plate body; It also includes a heat insulation portion, which is arranged between the first plate portion and the first plastic part.

8. The battery cover according to any one of claims 1 to 5, characterized in that: The cover body is further provided with an explosion-proof opening penetrating the cover body along the first direction; The battery cover is further provided with a limiting protrusion fixedly connected to the cover body, the limiting protrusion being provided along the edge of the explosion-proof opening, the limiting protrusion protruding toward the outside of the cover body along the first direction, and at least a portion of the limiting protrusion extending toward the middle of the explosion-proof opening; The battery cover further includes an explosion-proof valve and a fixed pressure ring. The explosion-proof valve is arranged in the explosion-proof opening and is press-fitted between the fixed pressure ring and at least a portion of the limiting protrusion.

9. The battery cover according to claim 8, characterized in that: It also includes a sealing rubber ring, which is arranged on the outside of the explosion-proof valve and pressed between the explosion-proof valve and the inner wall of the explosion-proof port; And / or, the fixed pressure ring includes a support ring and a crossbeam, the support ring is adapted to the shape of the explosion-proof opening, the crossbeam is arranged in the support ring, and both ends of the crossbeam are fixedly connected to different positions of the support ring.

10. A battery, characterized in that: A battery cover according to any one of claims 1 to 9.

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