Cover plate assembly and lithium battery

Abstract

The utility model relates to a cover plate assembly and a lithium battery, the cover plate assembly comprises a cover plate body, a first plastic cement and a second plastic cement, and the cover plate body is provided with a fixed column; the first plastic comprises a first end and a second end which are oppositely arranged, the first end of the first plastic is fixedly connected with one end of the cover plate body, and the second end of the first plastic extends towards the center position of the cover plate body; the second plastic comprises a first end and a second end which are oppositely arranged, the first end of the second plastic is fixedly connected with the other end of the cover plate body, and the second end of the second plastic extends towards the center position of the cover plate body; wherein the second end of one of the first plastic cement and the second plastic cement is fixedly connected with the fixing column, and the second end of the first plastic cement is in lap joint with the second end of the second plastic cement. Through the structural form, the risk that the second end of the first plastic cement and the second end of the second plastic cement droop due to gravity can be effectively reduced, so that the risk that the cover plate body and the periphery of the shell are poorly welded can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a cover plate assembly and a lithium battery. Background Art

[0002] In the structure of lithium battery, the cover plate is one of the important parts in the lithium battery. Therefore, the safety of the cover plate will affect the safety of the entire battery cell. Usually, the cover plate includes positive and negative riveting fasteners, positive upper plastic, negative upper plastic, positive pole, negative pole, sealing ring, explosion-proof valve protection sheet, explosion-proof valve, bare aluminum sheet and lower plastic. Among them, the bare aluminum sheet is mainly used for welding with the shell to achieve the sealing of the shell, and the lower plastic is set on the lower surface of the bare aluminum sheet, which mainly plays an insulating role.

[0003] For longer battery cells, the bare aluminum sheet and the lower plastic are also longer. Existing major battery manufacturers usually set the lower plastic to be split. However, after the lower plastic is made into a split type, the thickness of the lower plastic is about 0.7mm, and the end of the split lower plastic located in the middle of the bare aluminum sheet is prone to drooping due to gravity. If the end of the lower plastic located in the middle of the bare aluminum sheet droops due to gravity, the insulating sheet is hot-melted and then installed in the battery cell. The battery cell will push the sagging end of the lower plastic back to its original position, so that the insulating sheet will be inserted into the gap between the shell and the cover plate, causing poor peripheral welding, resulting in the battery cell not being completely sealed, which affects the safety of the battery cell. Utility Model Content

[0004] Based on this, it is necessary to provide a cover plate assembly and a lithium battery to address the technical problem in the related art that the lower plastic in the cover plate is prone to sag due to gravity, which may lead to poor peripheral welding.

[0005] A cover plate assembly, the cover plate assembly comprising:

[0006] The cover plate body is provided with a fixing column;

[0007] A first plastic, comprising a first end and a second end arranged opposite to each other, wherein the first end of the first plastic is fixedly connected to one end of the cover body, and the second end of the first plastic extends toward the center of the cover body;

[0008] A second plastic, comprising a first end and a second end arranged opposite to each other, the first end of the second plastic being fixedly connected to the other end of the cover body, and the second end of the second plastic extending toward the center of the cover body;

[0009] The second end of one of the first plastic and the second plastic is fixedly connected to the fixing column, and the second end of the first plastic and the second end of the second plastic are overlapped.

[0010] In one embodiment, a connecting hole is provided at the second end of the first plastic, the fixing column can pass through the connecting hole, and the fixing column can be deformed under the action of external force so that the end of the fixing column is blocked on the side of the first plastic away from the cover body.

[0011] In one embodiment, the fixing column comprises:

[0012] A connecting portion, one end of which is fixedly connected to the side surface of the cover body, and the other end of which extends in a direction away from the cover body;

[0013] A resisting portion connected to the other end of the connecting portion;

[0014] The connecting portion is inserted into the connecting hole, and the blocking portion is located outside the connecting hole and blocks the side surface of the first plastic to limit the first plastic from separating from the cover body.

[0015] In one embodiment, the cross-section of the blocking portion is elliptical.

[0016] In one embodiment, the number of the fixing columns is two, and the number of the connecting holes corresponds to the number of the fixing columns.

[0017] In one embodiment, the two fixing columns are arranged on both side edges of the cover body in the extension direction.

[0018] In one of the embodiments, the distance between the center of the fixing column and the center line of the cover body in its extension direction is between 0-200 mm.

[0019] In one embodiment, the second end of the first plastic is provided with a first stop, and the second end of the second plastic is provided with a second stop. The first stop and the second stop cooperate with each other, and the side wall corresponding to the first stop can resist the side wall of the second stop.

[0020] In one embodiment, the first end of the first plastic and the first end of the second plastic are respectively fixed to two ends of the cover body by riveting.

[0021] A lithium battery comprises the cover plate assembly as described above.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides a cover plate assembly, wherein the cover plate body is used for welding with a shell to achieve sealing of the shell mouth. By fixing the first end of the first plastic with one end of the cover plate body, and the first end of the second plastic with the other end of the cover plate body, the second end of one of the first plastic and the second plastic is fixed with a fixing column on the cover plate body to achieve the fixed connection of the second end of one of them with the cover plate body, and by overlapping the second end of the first plastic and the second end of the second plastic with each other, the second end of the plastic fixed with the fixing column and the second end of the plastic not fixed with the fixing column are limited, so as to achieve the second end of the first plastic and the second end of the second plastic being fixed to the cover plate body at the same time. Through the above structural form, the risk of the second end of the first plastic and the second end of the second plastic sagging due to gravity can be effectively reduced, thereby reducing the risk of the insulating sheet being inserted into the gap between the shell and the cover plate, causing the cover plate body and the shell periphery to be poorly welded, thereby improving the stability of the cover plate and the product quality of the product to ensure the safety performance of the battery core. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A front view of a cover plate assembly provided in one embodiment of the utility model;

[0025] Figure 2 A cross-sectional view of a cover plate assembly provided in one embodiment of the utility model;

[0026] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0027] Figure 4 A side view of a cover plate assembly provided in one embodiment of the utility model;

[0028] Figure 5 for Figure 4 A magnified schematic diagram of B;

[0029] Figure 6 A front view of a cover plate body in a cover plate assembly provided in one embodiment of the utility model;

[0030] Figure 7 A top view of a cover plate body in a cover plate assembly provided in one embodiment of the utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the first plastic in the cover assembly provided by one embodiment of the utility model.

[0032] Reference numerals:

[0033] Cover assembly 100; cover body 110; fixing column 120; connecting portion 121; blocking portion 122; first plastic 130; first end 131 of the first plastic; second end 132 of the first plastic; connecting hole 1321; first stop 1322; second plastic 140; first end 141 of the second plastic; second end 142 of the second plastic; second stop 1421. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] See also Figures 1 to 8 An embodiment of the utility model provides a cover assembly 100, which includes a cover body 110, a first plastic 130 and a second plastic 140, and a fixing column 120 is arranged on the cover body 110; the first plastic 130 includes a first end and a second end arranged oppositely, the first end 131 of the first plastic is fixedly connected to one end of the cover body 110, and the second end 132 of the first plastic extends toward the center of the cover body 110; the second plastic 140 includes a first end and a second end arranged oppositely, the first end 141 of the second plastic is fixedly connected to the other end of the cover body 110, and the second end 142 of the second plastic extends toward the center of the cover body 110; wherein the second end of one of the first plastic 130 and the second plastic 140 is fixedly connected to the fixing column 120, and the second end 132 of the first plastic and the second end 142 of the second plastic are overlapped.

[0041] The utility model provides a cover assembly 100, wherein the cover body 110 is used for welding with a shell to achieve sealing of the shell mouth. By fixing the first end 131 of the first plastic with one end of the cover body 110, and fixing the first end 141 of the second plastic with the other end of the cover body 110, the second end of one of the first plastic 130 and the second plastic 140 is fixed to the fixing column 120 on the cover body 110, so as to achieve the fixed connection between the second end of one of them and the cover body 110, and by overlapping the second end 132 of the first plastic and the second end 142 of the second plastic, so as to limit the second end of the plastic fixed with the fixing column 120 and the second end of the plastic not fixed with the fixing column 120, so as to achieve the mutual fixation of the second end 132 of the first plastic and the second end 142 of the second plastic with the cover body 110 at the same time. Through the above structure, the risk of the second end 132 of the first plastic and the second end 142 of the second plastic sagging due to gravity can be effectively reduced, thereby reducing the risk of the insulating sheet being inserted into the gap between the shell and the cover plate, causing poor welding between the cover plate body 110 and the periphery of the shell, thereby improving the stability of the cover plate and the product quality to ensure the safety performance of the battery cell.

[0042] It is understandable that there is no limitation on the fixing method of the first end 131 of the first plastic and the first end 141 of the second plastic to the cover body 110. In one embodiment, the first end 131 of the first plastic and the first end 141 of the second plastic are respectively fixed to the two ends of the cover body 110 by riveting. Of course, in other embodiments, the first end 131 of the first plastic and the first end 141 of the second plastic can also be fixed to the cover body 110 by snapping.

[0043] Combination Figure 2 , Figure 3 , Figure 7 and Figure 8 It is understood that in one embodiment, the second end 132 of the first plastic is provided with a connection hole 1321, and the fixing column 120 can pass through the connection hole 1321, and the fixing column 120 can be deformed under the action of an external force, so that the end of the fixing column 120 is blocked at the side of the first plastic 130 away from the cover body 110. By providing the connection hole 1321 at the second end 132 of the first plastic, the fixing column 120 can pass through the connection hole, and by deforming the fixing column 120, the deformed end is used to resist the side of the first plastic 130, thereby achieving the limitation of the second end 132 of the first plastic.

[0044] It should be noted that there is no limitation on the specific structure of the fixing column 120, which can be a columnar structure, and the connection hole 1321 is tightly matched with the fixing column 120, or the connection hole 1321 can just pass through the fixing column 120, and then the end of the fixing column 120 is deformed to achieve resistance to the side of the first plastic 130. Of course, in other embodiments, the fixing column 120 can also adopt the following structural form.

[0045] Specifically, refer to Figure 2 and Figure 3 It is understood that the fixing column 120 includes a connecting portion 121 and a resisting portion 122, one end of the connecting portion 121 is fixedly connected to the side of the cover body 110, and the other end of the connecting portion 121 extends in a direction away from the cover body 110; the resisting portion 122 is connected to the other end of the connecting portion 121; wherein, the connecting portion 121 is inserted into the connecting hole 1321, and the resisting portion 122 is located outside the connecting hole 1321 and resists the side of the first plastic 130 to limit the first plastic 130 from separating from the cover body 110.

[0046] It should be noted that in this embodiment, based on the fact that the first plastic 130 itself can undergo a large elastic deformation, the fixing column 120 is configured to connect the connecting portion 121 and the resisting portion 122, that is, the size of the connecting portion 121 inserted into the connecting hole 1321 is smaller than the outer size of the resisting portion 122. When the fixing column 120 is installed on the connecting hole 1321, a pressure force can be applied to the first plastic 130 to cause elastic deformation at the connecting hole 1321, so that the connecting hole 1321 passes over the resisting portion 122 and is sleeved on the outside of the connecting portion 121. Then, by deforming the resisting portion 122, the cross-sectional area of ​​the resisting portion 122 is made larger, thereby preventing the connecting hole 1321 from passing over the resisting portion 122 and separating from the fixing column 120. Among them, the cross-sectional shapes of the connecting portion 121 and the resisting portion 122 can be set to be circular, so that the structure is simple and easy to process.

[0047] Of course, in another embodiment, the cross-sectional shape of the connecting portion 121 is set to be circular, and the cross-sectional shape of the blocking portion 122 is set to be elliptical. This configuration can increase the blocking area of ​​the blocking portion 122, thereby improving the reliability of the connection between the fixing column 120 and the first plastic 130.

[0048] The fixing column 120 may be formed on the cover body 110 by integral molding, or may be formed on the cover body 110 by welding the connection portion 121 to the cover body 110 .

[0049] Reference Figure 1 , Figure 6 and Figure 8It is understood that in one embodiment, the number of the fixing posts 120 is two, and the number of the connecting holes 1321 corresponds to the number of the fixing posts 120. The two fixing posts 120 are arranged on the two side edges of the extension direction of the cover body 110. By arranging the fixing posts 120 on the two side edges of the extension direction of the cover body 110, not only the structure is simple, but also it is convenient to match the connecting holes 1321 with the fixing posts 120, and it is also beneficial to improve the reliability of the connection between the first plastic 130 and the cover body 110 after the connecting holes 1321 and the fixing posts 120 are installed.

[0050] Reference Figure 6 It is understood that in one embodiment, the distance between the center of the fixing column 120 and the center line of the cover body 110 in its extension direction is defined as D, and the size of D is between 0-200 mm. In this way, the position where the fixing column 120 and the first plastic 130 are connected is closer to the second end 132 of the first plastic, which is more conducive to preventing the second end 132 of the first plastic from sagging due to gravity.

[0051] Reference Figure 4 and Figure 5 It is understood that in one embodiment, the second end 132 of the first plastic is provided with a first stopper 1322, and the second end 142 of the second plastic is provided with a second stopper 1421. The first stopper 1322 and the second stopper 1421 cooperate with each other, and the side wall corresponding to the first stopper 1322 can resist the side wall of the second stopper 1421. By providing the stopper at the second end 132 of the first plastic and the second end of the second plastic 140, the second end 132 of the first plastic and the second end 132 of the first plastic can be overlapped by the mutual cooperation of the side walls of the stopper, so that the second plastic 140 is limited by the first plastic 130. Such a configuration not only simplifies the structure of the entire cover plate, but also improves the installation efficiency of the cover plate.

[0052] An embodiment of the utility model further provides a lithium battery, which includes the above cover plate assembly 100. By applying the above cover plate assembly 100 in the lithium battery, the risk of the middle position of the first plastic 130 and the second plastic 140 sagging due to gravity can be effectively reduced, thereby reducing the risk of the insulating sheet being inserted into the gap between the shell and the cover plate, causing poor welding between the cover plate body 110 and the periphery of the shell, thereby improving the stability of the cover plate and the product quality to ensure the safety performance of the battery cell.

[0053] The assembly process of the cover plate assembly 100 provided by the present invention is as follows:

[0054] First, the first end 131 of the first plastic and the first end 141 of the second plastic are riveted and fixed to the cover body 110 respectively. Then, the first stop 1322 of the first plastic 130 is placed on the second stop 1421 of the second plastic 140, and the connecting hole 1321 of the first plastic 130 is connected to the connecting part 121 by passing over the blocking part 122 of the fixing column 120, and then pressure is applied to the fixing column 120 to deform the blocking part 122, thereby achieving the mutual fixation of the second end 132 of the first plastic and the cover body 110.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A cover plate assembly, characterized in that: The cover plate assembly comprises: The cover plate body is provided with a fixing column; A first plastic, comprising a first end and a second end arranged opposite to each other, wherein the first end of the first plastic is fixedly connected to one end of the cover body, and the second end of the first plastic extends toward the center of the cover body; A second plastic, comprising a first end and a second end arranged opposite to each other, the first end of the second plastic being fixedly connected to the other end of the cover body, and the second end of the second plastic extending toward the center of the cover body; The second end of one of the first plastic and the second plastic is fixedly connected to the fixing column, and the second end of the first plastic and the second end of the second plastic are overlapped.

2. The cover plate assembly according to claim 1, characterized in that: The second end of the first plastic is provided with a connection hole, the fixing column can pass through the connection hole, and the fixing column can be deformed under the action of external force so that the end of the fixing column is blocked on the side of the first plastic away from the cover body.

3. The cover plate assembly according to claim 2, characterized in that: The fixing column comprises: A connecting portion, one end of which is fixedly connected to the side surface of the cover body, and the other end of which extends in a direction away from the cover body; A resisting portion connected to the other end of the connecting portion; The connecting portion is inserted into the connecting hole, and the blocking portion is located outside the connecting hole and blocks the side surface of the first plastic to limit the first plastic from separating from the cover body.

4. The cover plate assembly according to claim 3, characterized in that: The cross-section of the blocking portion is elliptical.

5. The cover plate assembly according to claim 2, characterized in that: The number of the fixing columns is two, and the number of the connecting holes corresponds to the number of the fixing columns.

6. The cover plate assembly according to claim 5, characterized in that: The two fixing columns are arranged on the two side edges of the cover body in the extending direction.

7. The cover plate assembly according to claim 1, characterized in that: The distance between the center of the fixing column and the center line of the cover body in its extension direction is between 0-200 mm.

8. The cover plate assembly according to any one of claims 2 to 7, characterized in that: The second end of the first plastic is provided with a first stopper, and the second end of the second plastic is provided with a second stopper. The first stopper and the second stopper match each other, and the side wall corresponding to the first stopper can resist the side wall of the second stopper.

9. The cover plate assembly according to any one of claims 1 to 7, characterized in that: The first end of the first plastic and the first end of the second plastic are respectively fixed to two ends of the cover body by riveting.

10. A lithium battery, characterized in that: The lithium battery comprises a cover plate assembly as described in any one of claims 1-9.

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