Battery cover plate and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a cover plate body, an explosion-proof structure and a sealing element, the cover plate body is provided with a mounting hole, the explosion-proof structure comprises a closing part and an inserting part, the inserting part is inserted in the mounting hole, the closing part is used for closing the mounting hole, and the sealing element is used for sealing the mounting hole. A first mounting groove annularly formed in the outer side of the inserting part is further formed in the side, facing the inserting part, of the sealing part, and the sealing piece is embedded in the first mounting groove and clamped between the cover plate body and the sealing part. The explosion-proof structure is provided with the inserting part, on one hand, the explosion-proof structure can be conveniently inserted into the mounting hole in the cover plate body, on the other hand, the front face and the back face of the explosion-proof structure can be distinguished, assembly errors are avoided, and the sealing part is clamped between the cover plate body and the sealing part due to the fact that the first mounting groove used for containing the sealing part is formed in the sealing part. And the gap between the cover plate body and the sealing part is sealed, so that the cover plate has good air tightness, and the product quality is improved.

Description

Technical Field

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

[0002] After a long period of cyclic discharge, the internal temperature of the battery gradually rises, thereby gradually increasing the air pressure inside the battery. When the pressure inside the battery accumulates to a certain level, it will break through the battery casing and explode.

[0003] In order to prevent the battery from exploding due to pressure breaking through the shell, the battery is usually equipped with an explosion-proof structure on the battery cover whose thickness is smaller than the battery cover. When the internal pressure of the battery accumulates to a certain level, the explosion-proof structure can be broken through to achieve the purpose of pressure relief and avoid battery explosion.

[0004] However, because the explosion-proof structure is generally fixedly connected to the cover body of the battery cover by welding, there are pores in the weld after welding, which makes it impossible to ensure the airtightness at the junction of the explosion-proof structure and the cover body. Therefore, the airtightness of the battery cover cannot meet the requirements, thereby reducing product quality.

[0005] Therefore, there is an urgent need for a battery cover and a battery to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a battery cover and a battery with good airtightness and excellent product quality.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] In one aspect, a battery cover is provided, comprising:

[0009] A cover body, wherein a mounting hole is formed on the cover body;

[0010] An explosion-proof structure, comprising a closing portion and a plug-in portion connected to the closing portion, wherein the plug-in portion is inserted into the mounting hole, the closing portion abuts against the cover body and is used to close the mounting hole, and a first mounting groove is further provided on the side of the closing portion facing the plug-in portion;

[0011] A sealing member is embedded in the first installation groove and is sandwiched between the cover body and the closing portion.

[0012] Optionally, a limiting protrusion extending in a direction close to the center of the mounting hole is further provided on the inner wall of the mounting hole of the cover body, so as to form a pressure relief hole on the cover body that is smaller in area than the mounting hole and concentric with the mounting hole, the closing portion abuts against the limiting protrusion, and the plug-in portion is inserted into the pressure relief hole.

[0013] Optionally, the explosion-proof structure further includes a limiting portion, which is provided on a side of the plug-in portion away from the closing portion, and extends in a direction away from the center of the mounting hole, and the limiting portion and the closing portion respectively abut against surfaces on both sides of the limiting protrusion.

[0014] Optionally, a second mounting groove corresponding to the first mounting groove is provided on a side of the limiting protrusion facing the closing portion, and the first mounting groove and the second mounting groove together constitute a mounting cavity for accommodating the sealing component.

[0015] Optionally, the height of the installation cavity is smaller than the thickness of the sealing element.

[0016] Optionally, the sealing member is an O-ring, and the first mounting groove and the second mounting groove are both arc-shaped grooves adapted to the sealing member.

[0017] Optionally, a surface at the junction of the limiting portion and the plug-in portion is arc-shaped.

[0018] Optionally, a weakening structure is further provided on a side of the closing portion facing the plug-in portion, and the weakening structure is located within the area enclosed by the plug-in portion.

[0019] On the other hand, a battery is provided, comprising a battery cover as described above, and further comprising a battery cell and a battery shell, wherein the battery cover is arranged on the battery shell to form a accommodating chamber for accommodating the battery cell.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a battery cover, which, by arranging a plug-in portion on the explosion-proof structure, facilitates the plugging of the explosion-proof structure with the mounting hole on the cover body on the one hand, and is conducive to distinguishing the front and back sides of the explosion-proof structure, thereby avoiding assembly errors. In addition, a first mounting groove is provided on the closing portion for closing the mounting hole, and a sealing member is embedded in the first mounting groove, so that after the battery cover is assembled, the sealing member is clamped between the cover body and the closing portion, and the gap between the cover body and the closing portion is sealed, so that the battery cover has good airtightness, thereby improving the product quality of the battery cover.

[0022] The utility model also provides a battery. By applying the above-mentioned battery cover, the battery can, on the one hand, provide pressure relief protection for the battery to ensure the safety of the battery. On the other hand, it ensures the structural airtightness of the battery when it is not under pressure relief, thereby making the battery have better product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of the battery cover provided by the utility model;

[0024] Figure 2 This is a structural exploded view of the battery cover provided by the present invention;

[0025] Figure 3 This is a front view of the cover body of the battery cover provided by the present invention;

[0026] Figure 4 This is a structural cross-sectional view of the battery cover provided by the present invention, near the mounting hole on the cover body;

[0027] Figure 5 This is a schematic diagram of the explosion-proof structure in the battery cover provided by the present invention;

[0028] Figure 6 It is a structural cross-sectional view of the upper edge of the explosion-proof structure in the battery cover provided by the utility model.

[0029] In the picture:

[0030] 1. Cover plate body; 11. Mounting hole; 12. Positioning protrusion; 13. Pressure relief hole; 14. Second mounting slot; 15. Liquid injection hole; 16. Mounting through hole;

[0031] 2. Explosion-proof structure; 21. Enclosing portion; 22. Connecting portion; 23. First mounting slot; 24. Position limiting portion; 25. Clamping slot; 26. Weakened structure;

[0032] 3. Seals;

[0033] 4. Pole;

[0034] 5. Upper insulation;

[0035] 6. Lower insulation;

[0036] 7. Riveting block;

[0037] 8. Pole sealing ring. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0039] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. 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 the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0042] After a long period of cyclic discharge, the internal temperature of the battery gradually rises, thereby gradually increasing the air pressure inside the battery. When the pressure inside the battery accumulates to a certain level, it will break through the battery casing and explode.

[0043] In order to prevent the battery from exploding due to pressure breaking through the shell, the battery is usually equipped with an explosion-proof structure on the battery cover whose thickness is smaller than the battery cover. When the internal pressure of the battery accumulates to a certain level, the explosion-proof structure can be broken through to achieve the purpose of pressure relief and avoid battery explosion.

[0044] However, because the explosion-proof structure is generally fixedly connected to the cover body of the battery cover by welding, there are pores in the weld after welding, which makes it impossible to ensure the airtightness at the junction of the explosion-proof structure and the cover body. Therefore, the airtightness of the battery cover cannot meet the requirements, thereby reducing product quality.

[0045] Therefore, in order to ensure the airtightness between the explosion-proof structure and the cover body after connection, this embodiment provides a battery cover.

[0046] like Figures 1 to 6 As shown, the battery cover includes a cover body 1, an explosion-proof structure 2 and a sealing member 3. A mounting hole 11 is opened on the cover body 1. The explosion-proof structure 2 includes a closing portion 21 and a plug-in portion 22 connected to the closing portion 21. The plug-in portion 22 is inserted into the mounting hole 11. The closing portion 21 abuts against the cover body 1 and is used to close the mounting hole 11. The side of the closing portion 21 facing the plug-in portion 22 is also provided with a first mounting groove 23 arranged around the outside of the plug-in portion 22. The sealing member 3 is embedded in the first mounting groove 23 and is clamped between the cover body 1 and the closing portion 21.

[0047] By providing the plug-in portion 22 on the explosion-proof structure 2, on the one hand, it is convenient to plug the explosion-proof structure 2 into the mounting hole 11 on the cover body 1, and on the other hand, it is helpful to distinguish the front and back sides of the explosion-proof structure 2 to avoid assembly errors. A first mounting groove 23 is provided on the closing portion 21 for closing the mounting hole 11, and the sealing member 3 is embedded in the first mounting groove 23, so that after the battery cover is assembled, the sealing member 3 is clamped between the cover body 1 and the closing portion 21, and the gap between the cover body 1 and the closing portion 21 is sealed, so that the battery cover has good airtightness, thereby improving the product quality of the battery cover.

[0048] The shape of the plug-in portion 22 matches the hole shape of the mounting hole 11. The mounting hole 11 on the cover body 1 can be a standard circle, an ellipse, or a rectangle. In this embodiment, the hole shape of the mounting hole 11 is an ellipse.

[0049] When assembling the explosion-proof structure 2, the sealing member 3 is first embedded in the first mounting groove 23, and then the plug-in portion 22 of the explosion-proof structure 2 is inserted into the mounting hole 11 on the cover body 1, so that the sealing member 3 is squeezed between the closing portion 21 and the cover body 1, causing the sealing member 3 to deform, thereby achieving a sealing effect. Finally, the closing portion 21 on the explosion-proof structure 2 and the cover body 1 are fixedly connected by welding.

[0050] The battery cover can be applied to different types of batteries, such as square shell batteries or blade batteries.

[0051] And in this embodiment, as Figure 2 、 Figure 3 As shown, the cover body 1 is further provided with an injection hole 15 for injecting electrolyte and a mounting through hole 16 for mounting the pole 4. In addition, in this embodiment, the battery cover further includes a pole 4, an upper insulating member 5, a lower insulating member 6, a rivet block 7 and a pole sealing ring 8. The upper insulating member 5 and the lower insulating member 6 are respectively arranged on the surfaces of both sides of the cover body 1, and the rivet block 7 is arranged on the upper insulating member 5. One end of the pole 4 passes through the lower insulating member 6, the cover body 1 and the upper insulating member 5 in sequence, and is finally riveted with the rivet block 7. The other end of the pole 4 abuts against the side of the lower insulating member 6 away from the cover body 1, wherein the pole sealing ring 8 is sleeved on the pole 4 to ensure the airtightness of the pole 4 after installation.

[0052] Alternatively, as Figure 4 As shown, the inner wall of the mounting hole 11 of the cover body 1 is further provided with a limiting protrusion 12 extending in a direction close to the center of the mounting hole 11, which is used to form a pressure relief hole 13 on the cover body 1 that is smaller in area than the mounting hole 11 and concentric with the mounting hole 11. The closing portion 21 abuts against the limiting protrusion 12, and the plug-in portion 22 is inserted into the pressure relief hole 13. By providing the limiting protrusion 12 on the inner wall of the mounting hole 11 of the cover body 1, it is convenient to assemble the explosion-proof structure 2 and the cover body 1. When the explosion-proof structure 2 is inserted into the pressure relief hole 13 using the plug-in portion 22, the limiting protrusion 12 is used to limit the closing portion 21, thereby ensuring the accuracy of the position of the explosion-proof structure 2 after installation.

[0053] Alternatively, as Figure 6 As shown, the explosion-proof structure 2 further includes a stopper 24, which is disposed on a side of the plug-in portion 22 facing away from the closing portion 21. The stopper 24 extends away from the center of the mounting hole 11. The stopper 24 and the closing portion 21 respectively abut against surfaces on both sides of the stopper protrusion 12. By providing the stopper 24 on the explosion-proof structure 2, the stopper 24, the closing portion 21, and the plug-in portion 22 form a slot 25 for engaging with the stopper protrusion 12, thereby further enhancing the secure assembly of the explosion-proof structure 2 with the cover body 1.

[0054] Alternatively, as Figure 4 、 Figure 6 As shown, a second mounting groove 14 corresponding to the first mounting groove 23 is provided on the side of the limiting protrusion 12 facing the sealing portion 21. The first mounting groove 23 and the second mounting groove 14 together constitute a mounting cavity for accommodating the seal 3. By providing the second mounting groove 14 corresponding to the first mounting groove 23 on the limiting protrusion 12, a mounting position for the seal 3 is also reserved on the cover body 1. Therefore, the first mounting groove 23 and the second mounting groove 14 ensure the accuracy of the installation position of the seal 3 and can also limit the seal 3 to prevent it from moving during assembly.

[0055] Optionally, the height of the mounting cavity is smaller than the thickness of the seal 3. By making the height of the mounting cavity smaller than the thickness of the seal 3, the seal 3 can be deformed under the pressure between the explosion-proof structure 2 and the cover body 1 during assembly, thereby better sealing the gap between the explosion-proof structure 2 and the cover body 1 and improving the airtightness of the battery cover.

[0056] Alternatively, as Figure 2 As shown, the seal 3 is an O-ring, and the first mounting groove 23 and the second mounting groove 14 are both arc-shaped grooves adapted to the seal 3. By setting the first mounting groove 23 and the second mounting groove 14 as arc-shaped grooves adapted to the seal 3, the seal 3 is ensured to fit tightly with the first mounting groove 23 and the second mounting groove 14, thereby further improving the airtightness of the assembled battery cover.

[0057] In this embodiment, the seal 3 is an O-ring made of rubber material. In other embodiments, the seal 3 can also be a U-ring, a V-ring or a Y-ring, etc., wherein the groove type of the first mounting groove 23 and the second mounting groove 14 needs to be adapted to the corresponding type of seal 3.

[0058] Alternatively, as Figure 6 As shown, the surface of the junction between the limiting portion 24 and the plug portion 22 is arc-shaped. By making the surface of the junction between the limiting portion 24 and the plug portion 22 arc-shaped, the limiting protrusion 12 is easily engaged in the card slot 25 formed by the limiting portion 24, the plug portion 22 and the closing portion 21.

[0059] Alternatively, as Figure 5 As shown, a weakening structure 26 is further provided on the side of the sealing portion 21 facing the plug portion 22. The weakening structure 26 is located within the area enclosed by the plug portion 22. By providing the weakening structure 26 on the side of the sealing portion 21 facing the plug portion 22, when the internal pressure of the battery is high, the weakening structure 26 can be used to easily break the sealing portion 21 and release the pressure, thereby improving the safety of use. In this embodiment, the weakening structure 26 is a notch.

[0060] In this embodiment, a battery is further provided. The battery includes the above-mentioned battery cover, and the battery also includes a battery cell and a battery shell. The battery cover is arranged on the battery shell to form a receiving chamber for accommodating the battery cell.

[0061] By applying the battery cover, the battery can, on the one hand, provide pressure relief protection for the battery to ensure the safety of the battery, and on the other hand, ensure the structural airtightness of the battery when not in pressure relief state, thereby making the battery have better product quality.

[0062] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Battery cover, characterized in that: The battery cover comprises: A cover plate body (1), wherein a mounting hole (11) is provided on the cover plate body (1); An explosion-proof structure (2), the explosion-proof structure (2) comprising a closing portion (21) and a plug-in portion (22) connected to the closing portion (21), the plug-in portion (22) being inserted into the mounting hole (11), the closing portion (21) being in contact with the cover plate body (1) and being used to close the mounting hole (11), and a first mounting groove (23) being arranged around the outer side of the plug-in portion (22) on a side of the closing portion (21) facing the plug-in portion (22); A sealing member (3) is embedded in the first mounting groove (23) and is sandwiched between the cover body (1) and the closing portion (21).

2. The battery cover according to claim 1, characterized in that: A limiting protrusion (12) extending in a direction close to the center of the mounting hole (11) is further provided on the inner wall of the mounting hole (11) of the cover plate body (1), so as to form a pressure relief hole (13) on the cover plate body (1) that is smaller in area than the mounting hole (11) and concentric with the mounting hole (11); the closing portion (21) abuts against the limiting protrusion (12), and the plug-in portion (22) is inserted into the pressure relief hole (13).

3. The battery cover according to claim 2, characterized in that: The explosion-proof structure (2) further comprises a limiting portion (24), the limiting portion (24) being arranged on a side of the plug-in portion (22) away from the closing portion (21), the limiting portion (24) extending in a direction away from the center of the mounting hole (11), the limiting portion (24) and the closing portion (21) respectively abutting against surfaces on both sides of the limiting protrusion (12).

4. The battery cover according to claim 2, characterized in that: A second mounting groove (14) corresponding to the first mounting groove (23) is provided on one side of the limiting protrusion (12) facing the closing portion (21); the first mounting groove (23) and the second mounting groove (14) together constitute a mounting cavity for accommodating the sealing member (3).

5. The battery cover according to claim 4, characterized in that: The height dimension of the installation cavity is smaller than the thickness dimension of the sealing member (3).

6. The battery cover according to claim 4, characterized in that: The sealing member (3) is an O-type sealing ring, and the first mounting groove (23) and the second mounting groove (14) are both arc-shaped grooves adapted to the sealing member (3).

7. The battery cover according to claim 3, characterized in that: The surface at the junction of the limiting portion (24) and the plug-in portion (22) is arc-shaped.

8. The battery cover according to claim 1, characterized in that: A weakening structure (26) is further provided on the side of the closing portion (21) facing the plug-in portion (22), and the weakening structure (26) is located within the area enclosed by the plug-in portion (22).

9. A battery, characterized in that The battery includes the battery cover according to any one of claims 1 to 8, and the battery also includes a battery cell and a battery shell. The battery cover is arranged on the battery shell to form a accommodating chamber for accommodating the battery cell.

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