Cap structure convenient for secondary liquid injection and lithium battery

Abstract

The utility model provides a cap structure convenient for secondary liquid injection and a lithium battery, the cap structure comprises a top cover and an anti-explosion sheet, the top cover is adjacent to the anti-explosion sheet and is connected with the anti-explosion sheet through welding; the top cover comprises an upper cover plate and an upper top plate, and the upper top plate is provided with a protrusion in the direction away from the anti-explosion piece. The upper top plate comprises a connecting part and an abutting plate which is detachably arranged on the connecting part, and the connecting part is located between the upper cover plate and the abutting plate; a liquid injection hole corresponding to the abutting plate in position is formed in the anti-explosion piece, a plugging piece is arranged in the liquid injection hole, and the plugging piece is used for sealing the liquid injection hole after primary liquid injection through the liquid injection hole; according to the battery, the liquid injection hole is formed in the anti-explosion piece, and the detachable abutting plate is arranged on the top cover, so that when secondary liquid injection is needed, injection of battery liquid is facilitated, the infiltration effect of electrolyte in the battery is guaranteed, the performance of the battery is improved, and the service life of the battery is prolonged.

Description

[Technical field]

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a cap structure and a lithium battery which are convenient for secondary liquid injection. [Background technology]

[0002] Batteries are widely used in life. Traditional batteries mainly include battery cells, battery cases and cap assemblies. That is, the battery cells are placed in the battery case and the tabs of the battery cells are bent and gathered together and then connected to the cap assembly, so as to achieve electrical connection between the cap assembly and the battery cells and seal the battery case. The battery cap is usually made of plastic or metal materials, and its main function is to protect the battery from the external environment and potential damage. The conventional combined cap structure includes: top cover (electrode cap), PTC, explosion-proof disk, spacer, orifice plate (aluminum bottom plate), and sealing ring.

[0003] However, the traditional cap has no secondary injection hole, and the battery is prone to poor electrolyte infiltration after a single injection, which can easily affect the performance of the battery.

[0004] In view of this, the utility model will provide a cap structure and a lithium battery that are convenient for secondary liquid injection to solve the above problems. [Contents of the utility model]

[0005] The purpose of the utility model is to provide a cap structure and a lithium battery which are convenient for secondary liquid injection, so as to improve the infiltration effect of the electrolyte in the battery and improve the performance and service life of the battery.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a cap structure that is convenient for secondary liquid injection, including a top cover and an explosion-proof plate, the top cover is adjacent to the explosion-proof plate and is connected to the explosion-proof plate by welding; the top cover includes an upper cover plate and an upper top plate, and the upper top plate is provided with a protrusion in a direction away from the explosion-proof plate; the upper top plate includes a connecting portion and an abutment plate that can be detached from the connecting portion, and the connecting portion is located between the upper cover plate and the abutment plate; the explosion-proof plate is provided with an injection hole whose position corresponds to the abutment plate, and a sealing member is provided in the injection hole, and the sealing member is used to seal the injection hole after a single injection through the injection hole.

[0007] On the basis of the above solution, a plurality of reinforcing members are provided on the connecting portion, and the reinforcing members are used to connect the top cover and the explosion-proof plate.

[0008] On the basis of the above scheme, a curved edge is formed on the peripheral side of the explosion-proof plate, and the curved edge covers the peripheral edge of the top cover; the connection between the curved edge and the upper cover plate is laser welded to achieve electrical connection between the explosion-proof plate and the top cover.

[0009] On the basis of the above solution, it also includes a sealing ring, which is coated on the periphery of the explosion-proof plate.

[0010] On the basis of the above solution, the connecting portion and the abutting plate are connected by a snap-fitting manner.

[0011] On the basis of the above solution, an explosion-proof zone is provided on the explosion-proof plate, and a pressure relief hole corresponding to the position of the explosion-proof zone is provided on the upper cover plate.

[0012] On the basis of the above solution, an explosion-proof score line is arranged on a side of the explosion-proof plate away from the pressure relief hole, and the explosion-proof score line is arranged along the edge of the explosion-proof zone.

[0013] On the basis of the above solution, the explosion-proof zone is set corresponding to the shape and size of the pressure relief hole.

[0014] Based on the above solution, the explosion-proof zone is set to be circular.

[0015] In order to solve the above problems, the present application also provides a lithium battery, including a steel shell, a winding core arranged in the steel shell, and the above-mentioned cap structure that facilitates secondary liquid injection.

[0016] Compared with the prior art, the utility model provides a cap structure and a lithium battery that are convenient for secondary liquid injection, including a top cover and an explosion-proof plate, the top cover is adjacent to the explosion-proof plate and is connected to the explosion-proof plate by welding; the top cover includes an upper cover plate and an upper top plate, the upper top plate is provided with a protrusion in a direction away from the explosion-proof plate; the upper top plate includes a connecting portion and an abutment plate that can be detached from the connecting portion, the connecting portion is located between the upper cover plate and the abutment plate; the explosion-proof plate is provided with an injection hole corresponding to the position of the abutment plate, and a sealing member is provided in the injection hole, and the sealing member is used to seal in the injection hole after a single injection through the injection hole; by providing the injection hole on the explosion-proof plate and the detachable abutment plate on the top cover, the present application can facilitate the injection of battery liquid when secondary liquid injection is required, ensure the infiltration effect of the electrolyte in the battery, and improve the performance and service life of the battery.

Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A partial exploded view of the cap structure is provided for the utility model;

[0019] Figure 2 For Figure 1 the upward view structural schematic diagram of the explosion-proof sheet shown;

[0020] As shown in the figure:

[0021] cap structure 100;

[0022] top cover 10, upper cover plate 101, pressure relief hole 1011, upper top plate 102, connecting part 1021, abutting plate 1022, strengthening member 103;

[0023] explosion-proof sheet 20, liquid injection hole 201, explosion-proof area 202, explosion-proof engraved line 203, flanging 204;

[0024] sealing ring 30;

Specific Embodiment

[0025] In order to make the purpose, technical solution and beneficial technical effects of the present utility model clearer, the following further details the present utility model in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are only for explaining the present utility model and not for limiting the present utility model.

[0026] It should also be understood that the terms used in this specification of the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. As used in this specification of the present utility model and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0027] It should be further understood that the term " / and" used in this specification of the present utility model and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0028] Such as Figure 1-2 shown, the present utility model provides a cap structure 100 facilitating secondary liquid injection, including a top cover 10 and an explosion-proof sheet 20, wherein the top cover 10 is adjacent to the explosion-proof sheet 20 and is connected to the explosion-proof sheet 20 by welding.

[0029] Specifically, the top cover 10 includes an upper cover plate 101 and an upper top plate 102, the upper top plate 102 is located in the middle of the top cover 10, and the upper top plate 102 is provided with a convexity in the direction away from the explosion-proof sheet 20.

[0030] The upper top plate 102 includes a connecting portion 1021 and a contact plate 1022 detachably mounted on the connecting portion 1021. The cross-section of the connecting portion 1021 is curved, and the connecting portion 1021 is used to support the contact plate 1022 to protrude above the upper cover plate 101. The connecting portion 1021 is located between the upper cover plate 101 and the contact plate 1022, and the connecting portion 1021 is arranged around the contact plate 1022. Further, the connection between the connecting portion 1021 and the contact plate 1022 is by snap connection, so that the contact plate 1022 is mounted on the connecting portion 1021. Of course, other methods can also be used.

[0031] Specifically, a liquid injection hole 201 corresponding to the contact plate 1022 in position is provided on the explosion-proof sheet 20. A sealing member (not shown) is arranged in the liquid injection hole 201. The sealing member is used to seal in the liquid injection hole 201 after one-time liquid injection through the liquid injection hole 201. When the battery needs secondary liquid injection, by removing the contact plate 1022 and the sealing member in the liquid injection hole 201, liquid injection can be carried out. This structure can facilitate the liquid injection operation when the battery needs liquid injection, ensure the wetting effect of the battery liquid in the battery, and improve the performance and service life of the battery.

[0032] Further, a plurality of strengthening members 103 are arranged on the connecting portion 1021. The plurality of strengthening members 103 are arranged at intervals around the contact plate 1022. The strengthening members 103 are used to connect the top cover 10 and the explosion-proof sheet 20. This operation can strengthen the connection between the top cover 10 and the explosion-proof sheet 20, increase the contact area between the top cover 10 and the explosion-proof sheet 20, and thus ensure the over-current capacity of the cap. The strengthening members 103 can also be used to support the connecting portion 1021, improve the supporting effect of the connecting portion 1021 on the contact plate 1022, make the connecting portion 1021 not easily deformed, and thus ensure the overall strength of the upper top plate 102.

[0033] Specifically, a bent edge 204 is formed on the periphery of the explosion-proof sheet 20. The bent edge 204 covers the periphery of the top cover 10, that is, the bent edge 204 covers the periphery of the upper cover plate 101. The connection between the bent edge 204 and the upper cover plate 101 is laser welded, and the electrical connection between the explosion-proof sheet 20 and the top cover 10 can be realized.

[0034] Specifically, the cap structure 100 further includes a sealing ring 30. The sealing ring 30 covers the periphery of the explosion-proof sheet 20.

[0035] Specifically, an explosion-proof area 202 is provided on the explosion-proof sheet 20, and a pressure relief hole 1011 corresponding to the position of the explosion-proof area 202 is provided on the upper cover plate 101; further, an explosion-proof score line 203 is provided on the side of the explosion-proof sheet 20 facing away from the pressure relief hole 1011, and the explosion-proof score line 203 is arranged along the edge of the explosion-proof area 202; this setting can cause the explosion-proof area 202 to burst along the explosion-proof score line 203 when the internal pressure of the battery is too high, so that the pressure relief hole 1011 is ventilated, thereby discharging the high-temperature and high-pressure gas inside the battery and protecting the safety of the battery; it should be noted that the shapes and sizes of the explosion-proof area 202 and the pressure relief hole 1011 correspond; the explosion-proof area 202 can be set to a circular shape; of course, it can also be set to other shapes.

[0036] This embodiment also provides a lithium battery, including a steel shell, a winding core arranged in the steel shell, and the above-mentioned cap structure 100 facilitating secondary liquid injection.

[0037] In summary, the present invention provides a cap structure 100 facilitating secondary liquid injection and a lithium battery, including a top cover 10 and an explosion-proof sheet 20. The top cover 10 is adjacent to the explosion-proof sheet 20 and is connected to the explosion-proof sheet 20 by welding; the top cover 10 includes an upper cover plate 101 and an upper top plate 102, and the upper top plate 102 is provided with a protrusion in a direction away from the explosion-proof sheet 20; the upper top plate 102 includes a connecting portion 1021 and a contact plate 1022 detachably mounted on the connecting portion 1021, and the connecting portion 1021 is located between the upper cover plate 101 and the contact plate 1022; an injection hole 201 corresponding to the position of the contact plate 1022 is provided on the explosion-proof sheet 20, and a sealing member is arranged in the injection hole 201, and the sealing member is used to seal the injection hole 201 after primary liquid injection through the injection hole 201; by providing the injection hole 201 on the explosion-proof sheet 20 and the detachable contact plate 1022 on the top cover 10 in this application, it is convenient for the injection operation of the battery liquid when secondary liquid injection is required, thereby ensuring the wetting effect of the electrolyte in the battery and improving the performance and service life of the battery.

[0038] The present invention is not limited only to what is described in the specification and the embodiments. Therefore, for those skilled in the art, additional advantages and modifications can be easily achieved. Thus, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrated examples shown and described herein.

Claims

1. A cap structure that facilitates secondary liquid injection, characterized in that: It includes a top cover and an explosion-proof plate, wherein the top cover is adjacent to the explosion-proof plate and is connected to the explosion-proof plate by welding; the top cover includes an upper cover plate and an upper top plate, and the upper top plate is provided with a protrusion in a direction away from the explosion-proof plate; the upper top plate includes a connecting portion and an abutting plate which can be detached from the connecting portion, and the connecting portion is located between the upper cover plate and the abutting plate; the explosion-proof plate is provided with an injection hole whose position corresponds to the abutting plate, and a sealing member is provided in the injection hole, and the sealing member is used to seal the injection hole after liquid is injected once through the injection hole.

2. The cap structure for facilitating secondary liquid injection according to claim 1, characterized in that: A plurality of reinforcing members are arranged on the connecting portion, and the reinforcing members are used to connect the top cover and the explosion-proof plate.

3. The cap structure for facilitating secondary liquid injection according to claim 1, characterized in that: The circumferential side of the explosion-proof plate is formed with a curved edge, and the curved edge is covered on the circumferential edge of the top cover; the connection between the curved edge and the upper cover plate is laser welded to achieve electrical connection between the explosion-proof plate and the top cover.

4. The cap structure for facilitating secondary liquid injection according to claim 1, characterized in that: It also includes a sealing ring, which is coated on the periphery of the explosion-proof disk.

5. The cap structure for facilitating secondary liquid injection according to claim 1, characterized in that: The connecting portion and the abutting plate are connected in a clamping manner.

6. The cap structure for facilitating secondary liquid injection according to claim 1, characterized in that: The explosion-proof plate is provided with an explosion-proof area, and the upper cover plate is provided with a pressure relief hole corresponding to the position of the explosion-proof area.

7. The cap structure for facilitating secondary liquid injection according to claim 6, characterized in that: An explosion-proof score line is arranged on a side of the explosion-proof sheet away from the pressure relief hole, and the explosion-proof score line is arranged along the edge of the explosion-proof area.

8. The cap structure for facilitating secondary liquid injection according to claim 6, characterized in that: The explosion-proof area is arranged corresponding to the shape and size of the pressure relief hole.

9. The cap structure for facilitating secondary liquid injection according to claim 6, characterized in that: The explosion-proof area is arranged in a circular shape.

10. A lithium battery, comprising a steel shell and a winding core disposed in the steel shell, characterized in that: It comprises a cap structure for facilitating secondary liquid injection as described in any one of claims 1 to 9.

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