Cylindrical battery cover plate structure and secondary battery

Abstract

The utility model belongs to the technical field of battery structures, and particularly discloses a cylindrical battery cover plate structure and a secondary battery. The cylindrical battery cover plate structure comprises a shell, a roll core, a cover plate seat, a positive electrode cover plate, a negative electrode cover plate and a negative electrode nail, the cover plate seat is provided with a first mounting groove and a second mounting groove; the positive electrode cover plate is arranged in the first mounting groove; the negative electrode cover plate is arranged in the second mounting groove; the cover plate seat is provided with a connecting channel, the threaded hole of the negative electrode cover plate is connected with the external threaded section of the negative electrode nail, and the negative electrode nail penetrates through the connecting channel to be communicated with the negative electrode of the roll core. As the relative positions of the cathode nail and the cathode cover plate are fixed through the external thread section and the threaded hole, when the cathode nail and the cathode cover plate are welded, the relative positions between the cathode plate and the cathode nail cannot be changed, the cathode plate and the cathode nail can be positioned and assembled, and the cathode cover plate and the cathode nail can be tightly connected; and the conduction performance between the cathode nail and the cathode cover plate is improved, so that the assembly precision is ensured, and the product percent of pass is improved.

Description

Technical Field

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

[0002] At present, in the existing technology, most of the electrode cover plates of cylindrical batteries are connected to the electrode columns by riveting or direct welding. However, during riveting or welding, stress is generated, which causes the relative position between the cover plate and the electrode column to change after completion, affecting the subsequent assembly of the cover plate and easily producing defective products. Utility Model Content

[0003] The purpose of the utility model is to provide a cylindrical battery cover structure to solve the technical problem in the prior art that the relative position between the cover and the electrode column changes, affecting the subsequent assembly of the cover and easily producing defective products.

[0004] In order to achieve the above objectives, the first aspect of the present invention provides a cylindrical battery cover structure, which includes:

[0005] A housing having an opening; an interior of the housing having a mounting cavity communicating with the opening;

[0006] a winding core, which is arranged in the installation cavity;

[0007] a cover plate seat closing the opening; a first mounting groove and a second mounting groove are provided on a side of the cover plate seat facing away from the winding core;

[0008] A positive electrode cover plate, which is disposed in the first mounting groove; the positive electrode cover plate is electrically connected to the positive electrode of the winding core;

[0009] A negative electrode cover plate is disposed in the second mounting groove; the negative electrode cover plate is electrically connected to the negative electrode of the winding core;

[0010] Negative electrode nail;

[0011] Among them, the positive electrode cover plate and the negative electrode cover plate are respectively arranged in the first mounting groove and the second mounting groove, so that the positive electrode and the negative electrode of the cylindrical battery are located at the same end of the cylindrical battery; the cover plate seat is provided with a connecting channel connecting the second mounting groove and the mounting cavity; the negative electrode nail cover plate is provided with a threaded hole, and the negative electrode nail is provided with an external thread section threadedly connected to the threaded hole, and the external thread section is welded to the negative electrode cover plate; the negative electrode nail passes through the connecting channel, and the negative electrode cover plate is connected to the negative electrode of the winding core through the negative electrode nail.

[0012] Preferably, a nail cap plate is provided on the side of the negative electrode nail facing the winding core, and the nail cap plate is located on the side of the cover plate seat facing the winding core; when the external thread section of the negative electrode nail is screwed into the threaded hole of the negative electrode cover plate, the nail cap plate cooperates with the negative electrode cover plate to clamp the cover plate seat, and the nail cap plate is connected to the negative electrode of the winding core.

[0013] Preferably, the cover seat is an elastic insulating rubber member.

[0014] Preferably, a first recessed groove is provided on the side of the negative electrode cover plate facing away from the winding core; the threaded hole is provided on the bottom surface of the first recessed groove, and a flush surface is provided on the end of the negative electrode nail facing away from the winding core. When the external threaded section of the negative electrode nail is screwed into the threaded hole of the negative electrode cover plate until the flush surface is flush with the bottom surface of the first recessed groove, the nail cap plate cooperates with the negative electrode cover plate to clamp the cover plate seat.

[0015] Preferably, the shell is a metal shell having a shell flange for connecting with the positive electrode cover plate, and the positive electrode cover plate is welded to the shell flange.

[0016] Preferably, the cover plate seat is provided with a closed groove; the closed groove is provided with an elastic closed portion; the positive electrode cover plate is provided with a ventilation groove for communicating with the closed groove; the positive electrode cover plate is provided with a pressure relief puncture portion on the side facing the elastic closed portion; the pressure relief puncture portion is used to puncture the elastic closed portion, and when the pressure relief puncture portion punctures the elastic closed portion, the elastic closed portion generates a ventilation gap, and the ventilation groove is connected to the mounting cavity through the ventilation gap.

[0017] Preferably, the pressure relief puncture portion is a V-shaped spike.

[0018] Preferably, the ventilation groove is provided on the V-shaped spike.

[0019] A second aspect of the present invention provides a secondary battery, which includes a box body and the above-mentioned cylindrical battery cover plate structure, wherein the cylindrical battery cover plate structure is arranged in the box body.

[0020] The cylindrical battery cover plate structure and secondary battery provided by the utility model have the following beneficial effects: the cylindrical battery cover plate structure is screwed into the threaded hole through the external thread section of the negative electrode nail, so that the negative electrode cover plate and the negative electrode nail are positioned and connected, and the negative electrode cover plate and the negative electrode nail are positioned in cooperation with the second mounting groove and the connecting channel. Therefore, when the negative electrode nail and the negative electrode cover plate are welded, the stress generated during welding is not enough to change the position between the negative electrode cover plate and the negative electrode nail, thereby ensuring that the relative position between the negative electrode plate and the negative electrode nail does not change, ensuring that the negative electrode plate and the negative electrode nail are positioned and assembled, and also allowing the negative electrode cover plate and the negative electrode nail to be tightly connected, thereby improving the conductivity performance between the negative electrode nail and the negative electrode cover plate, thereby ensuring assembly accuracy and improving product qualification rate.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a cylindrical battery cover structure according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic cross-sectional view of a cylindrical battery cover structure according to an embodiment of the present invention;

[0024] Figure 3 This is a structural diagram of a cover plate seat of a cylindrical battery cover plate structure according to an embodiment of the present invention;

[0025] Figure 4 This is a structural diagram of the negative electrode cover of the cylindrical battery cover structure of an embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the positive electrode cover plate of the cylindrical battery cover plate structure of an embodiment of the present utility model.

[0027] In the figure, 100, shell; 110, shell flange; 200, winding core; 300, cover seat; 310, first mounting groove; 320, second mounting groove; 330, connecting channel; 340, closing groove; 350, elastic closing portion; 400, positive cover; 410, vent groove; 420, pressure relief puncture portion; 500, negative cover; 510, threaded hole; 520, first sinking groove; 600, negative nail; 610, external thread section; 620, nail cap plate; 630, flat surface. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Please also refer to Figures 1 to 5 , the vehicle chassis provided by the embodiment of the present utility model is now described.

[0033] like Figures 1 to 5 As shown, a cylindrical battery cover structure according to an embodiment of the present invention includes: a housing 100, a winding core 200, a cover seat 300, a positive electrode cover 400, a negative electrode cover 500, and a negative electrode nail 600;

[0034] The housing 100 has an opening; the housing 100 has an installation cavity communicating with the opening; the winding core 200 is disposed in the installation cavity; a cover plate seat 300 closes the opening; a first installation groove 310 and a second installation groove 320 are provided on the side of the cover plate seat 300 facing away from the winding core 200; a positive electrode cover plate 400 is disposed in the first installation groove 310; the positive electrode cover plate 400 is electrically connected to the positive electrode of the winding core 200; a negative electrode cover plate 500 is disposed in the second installation groove 320; the negative electrode cover plate 500 is electrically connected to the negative electrode of the winding core 200;

[0035] The positive electrode cover plate 400 and the negative electrode cover plate 500 are respectively arranged in the first mounting groove 310 and the second mounting groove 320, that is, the positive electrode cover plate 400 and the negative electrode cover plate 500 are integrated on the cover plate seat 300, so that the positive and negative electrodes of the cylindrical battery can be on the same end. The cover plate seat 300 is provided with a connecting channel 330 connecting the second mounting groove 320 and the mounting cavity; the negative electrode nail 600 cover plate is provided with a threaded hole 510, and the negative electrode nail 600 is provided with an external thread section 610 that is threadedly connected to the threaded hole 510. The external thread section 610 is welded to the negative electrode cover plate 500; the negative electrode nail 600 passes through the connecting channel 330, and the negative electrode cover plate 500 is connected to the negative electrode of the winding core 200 through the negative electrode nail 600.

[0036] Specifically, the negative electrode nail 600 is located within the connecting channel 330, cooperating with the negative electrode cover 500 to seal the connecting channel 330 and prevent leakage of liquid or gas within the battery cell. The negative electrode nail 600 is secured to the threaded hole 510 of the negative electrode cover 500 via an external threaded section 610. The negative electrode nail 600 acts as a bridge, allowing the negative electrode cover 500 to pass through the cover base 300 and connect to the negative electrode of the winding core 200.

[0037] During assembly, the external threaded section 610 of the negative electrode nail 600 is first screwed into the threaded hole 510, so that the negative electrode cover plate 500 and the negative electrode nail 600 are pre-positioned and fastened. The second mounting groove 320 and the connecting channel 330 are then used to pre-position the negative electrode cover plate 500 and the negative electrode nail 600 to prevent misalignment of the negative electrode nail 600 and the negative electrode cover plate 500 during subsequent battery assembly. After the negative electrode cover plate 500 and the negative electrode nail 600 are fastened together by thread, the external threaded section 610 and the negative electrode cover plate 500 are welded to seal the gap between the external threaded section 610 and the negative electrode cover plate 500, ensuring sealing. This also allows for a tighter connection between the negative electrode cover plate 500 and the negative electrode nail 600, improving the conductivity between the negative electrode nail 600 and the negative electrode cover plate 500.

[0038] The cylindrical battery cover structure of this embodiment is screwed into the threaded hole 510 through the external thread section 610 of the negative electrode nail 600, so that the negative electrode cover 500 is positioned and connected to the negative electrode nail 600, and the second mounting groove 320 and the connecting channel 330 are used to position the negative electrode cover 500 and the negative electrode nail 600. When the negative electrode nail 600 is welded to the negative electrode cover 500, the stress generated during welding is not enough to change the position between the negative electrode cover 500 and the negative electrode nail 600, thereby ensuring that the relative position between the negative electrode plate and the negative electrode nail 600 does not change, ensuring that the negative electrode plate and the negative electrode nail 600 are positioned and assembled, and also allowing the negative electrode cover 500 and the negative electrode nail 600 to be tightly connected, thereby improving the conductivity performance between the negative electrode nail 600 and the negative electrode cover 500, thereby ensuring assembly accuracy and improving product qualification rate.

[0039] In some embodiments of the present invention, referring to Figures 2 to 4A nail cap plate 620 is provided on the side of the negative electrode nail 600 facing the winding core 200, and the nail cap plate 620 is located on the side of the cover plate seat 300 facing the winding core 200; when the external thread section 610 of the negative electrode nail 600 is screwed into the threaded hole 510 of the negative electrode cover plate 500, the nail cap plate 620 cooperates with the negative electrode cover plate 500 to clamp the cover plate seat 300, and the nail cap plate 620 is conductive with the negative electrode of the winding core 200. The outer diameter of the nail cap plate 620 is larger than the inner diameter of the connecting channel 330, and the outer diameter of the connecting channel 330 is adapted to the outer diameter of the negative electrode nail 600. Therefore, when the negative electrode nail 600 is threadedly connected to the negative electrode cover plate 500 through the connecting channel 330, the nail cap plate 620 approaches the negative electrode cover plate 500, and then cooperates with the negative electrode cover plate 500 to clamp the cover plate seat 300, so that the nail cap plate 620 and the negative electrode cover plate 500 cooperate to seal the connecting channel 330 to ensure the sealing performance.

[0040] In some embodiments of the present invention, the cover plate seat 300 is an elastic insulating rubber member, so that the negative electrode cover plate 500 and the nail cap plate 620 of the negative electrode nail 600 cooperate to clamp the cover plate seat 300, thereby compressing the rubber cover plate seat 300 to achieve sealing.

[0041] Reference Figures 2 to 4 In some embodiments of the present invention, a first recessed groove 520 is provided on the side of the negative electrode cover plate 500 facing away from the winding core 200; the threaded hole 510 is provided on the bottom surface of the first recessed groove 520, and a flush surface 630 is provided on the end of the negative electrode nail 600 facing away from the winding core 200. When the external threaded section 610 of the negative electrode nail 600 is screwed into the threaded hole 510 of the negative electrode cover plate 500 until the flush surface 630 is flush with the bottom surface of the first recessed groove 520, the nail cap plate 620 cooperates with the negative electrode cover plate 500 to clamp the cover plate seat 300. By providing the first sinking groove 520, it is convenient for the welding equipment to weld the negative electrode cover plate 500 and the negative electrode nail 600 in the first sinking groove 520, and the flush surface 630 and the bottom surface of the first sinking groove 520 are used as positioning standards. When the flush surface 630 is flush with the bottom surface of the first sinking groove 520, it means that the negative electrode nail 600 has been rotated into place, and the negative electrode nail 600 has been clamped and compressed with the negative electrode cover plate 500 by the nail cap plate 620, achieving the predetermined sealing performance. Then, the negative electrode nail 600 and the negative electrode cover plate 500 can be welded.

[0042] Reference Figures 2 to 4In some embodiments of the present invention, the housing 100 is a metal housing 100 having a housing 100 flange for connecting to the positive electrode cover plate 400, and the positive electrode cover plate 400 is welded to the housing 100 flange. Welding the housing 100 flange of the metal housing 100 to the positive electrode cover plate 400 can increase the connection strength of the connection between the housing 100 and the positive electrode cover plate 400 and improve the conductivity between the housing 100 and the positive electrode cover plate 400, so as to achieve good conductivity between the positive electrode cover plate 400 and the metal housing 100. The positive electrode cover plate 400 is connected to the positive electrode of the winding core 200 through the housing 100 to ensure conductivity.

[0043] Reference Figures 2 to 5 In some embodiments of the present invention, the cover plate seat 300 is provided with a closed groove 340; the closed groove 340 is provided with an elastic closed portion 350; the positive cover plate 400 is provided with a vent groove 410 for communicating with the closed groove 340; the positive cover plate 400 is provided with a pressure relief puncture portion 420 on the side facing the elastic closed portion 350; the pressure relief puncture portion 420 is used to puncture the elastic closed portion 350. When the pressure relief puncture portion 420 punctures the elastic closed portion 350, a ventilation gap is generated in the elastic closed portion 350, and the ventilation groove 410 is connected to the installation cavity through the ventilation gap. The elastic closing portion 350 is elastic and can be directly integrally formed with the cover seat 300. The cover seat 300 is directly formed of rubber and is an elastic insulating rubber part used to close the opening of the shell 100; since the cover seat 300 seals the opening, during normal use, the elastic closing portion 350 closes the closing groove 340, and the installation cavity is in a sealed state; when the air pressure in the installation cavity is abnormal, the elastic closing portion 350 will be deformed into shape under the action of the air pressure, causing the elastic closing portion 350 to abut against the pressure relief puncture portion 420, and the pressure relief puncture portion 420 will puncture the elastic closing portion 350, so that the elastic closing portion 350 produces a ventilation gap, allowing the installation cavity to connect to the ventilation groove 410 through the ventilation gap of the elastic closing portion 350, so that the installation cavity can be connected to the external space, so as to achieve the purpose of depressurizing the cylindrical battery and avoid explosion.

[0044] Reference Figures 2 to 5 In some embodiments of the present invention, the pressure relief puncturing portion 420 is a V-shaped spike. The V-shaped spike is disposed on the side of the positive electrode cover plate 400 facing the sealing groove 340, with the tip of the V-shaped spike facing the elastic sealing portion 350. When the elastic sealing portion 350 deforms under the action of air pressure, the elastic sealing portion 350 directly contacts the tip of the V-shaped spike, puncturing the elastic sealing portion 350 and connecting the mounting cavity to the vent groove 410 to achieve the purpose of pressure relief.

[0045] Reference Figures 2 to 5In some embodiments of the present invention, the vent groove 410 is provided on the V-shaped spike. That is, the vent groove 410 directly passes through the positive electrode cover plate 400 and the V-shaped spike, so that the vent groove 410 faces the closed groove 340 for pressure relief.

[0046] This embodiment also provides a secondary battery, comprising a housing and the cylindrical battery cover structure, wherein the cylindrical battery cover structure is disposed within the housing. The cylindrical battery cover structure is screwed into the threaded hole 510 via the external threaded section 610 of the negative electrode nail 600, thereby positioning and connecting the negative electrode cover 500 to the negative electrode nail 600. Furthermore, the negative electrode cover 500 and the negative electrode nail 600 are positioned in cooperation with the second mounting groove 320 and the connecting channel 330. Therefore, when the negative electrode nail 600 is welded to the negative electrode cover 500, the stress generated during welding is insufficient to cause the position between the negative electrode cover 500 and the negative electrode nail 600 to change, thereby ensuring that the relative position between the negative electrode plate and the negative electrode nail 600 does not change, thereby ensuring that the negative electrode plate and the negative electrode nail 600 are positioned and assembled. Furthermore, the negative electrode cover 500 and the negative electrode nail 600 are tightly connected, thereby improving the conductivity between the negative electrode nail 600 and the negative electrode cover 500, thereby ensuring assembly accuracy and improving the product qualification rate.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A cylindrical battery cover structure, characterized in that: include: A housing having an opening; an interior of the housing having a mounting cavity communicating with the opening; a winding core, which is arranged in the installation cavity; a cover plate seat closing the opening; a first mounting groove and a second mounting groove are provided on a side of the cover plate seat facing away from the winding core; A positive electrode cover plate, which is disposed in the first mounting groove; the positive electrode cover plate is electrically connected to the positive electrode of the winding core; A negative electrode cover plate is disposed in the second mounting groove; the negative electrode cover plate is electrically connected to the negative electrode of the winding core; Negative electrode nail; Among them, the positive electrode cover plate and the negative electrode cover plate are respectively arranged in the first mounting groove and the second mounting groove, so that the positive electrode and the negative electrode of the cylindrical battery are located at the same end of the cylindrical battery; the cover plate seat is provided with a connecting channel connecting the second mounting groove and the mounting cavity; the negative electrode nail cover plate is provided with a threaded hole, and the negative electrode nail is provided with an external thread section threadedly connected to the threaded hole, and the external thread section is welded to the negative electrode cover plate; the negative electrode nail passes through the connecting channel, and the negative electrode cover plate is connected to the negative electrode of the winding core through the negative electrode nail.

2. The cylindrical battery cover structure according to claim 1, characterized in that: A nail cap plate is provided on the side of the negative electrode nail facing the winding core, and the nail cap plate is located on the side of the cover plate seat facing the winding core; when the external thread section of the negative electrode nail is screwed into the threaded hole of the negative electrode cover plate, the nail cap plate cooperates with the negative electrode cover plate to clamp the cover plate seat, and the nail cap plate is connected to the negative electrode of the winding core.

3. The cylindrical battery cover structure according to claim 2, characterized in that: The cover plate seat is an elastic insulating rubber part.

4. The cylindrical battery cover structure according to claim 3, characterized in that: A first recessed groove is provided on the side of the negative electrode cover plate facing away from the winding core; the threaded hole is provided on the bottom surface of the first recessed groove, and a flush surface is provided on the end of the negative electrode nail facing away from the winding core. When the external threaded section of the negative electrode nail is screwed into the threaded hole of the negative electrode cover plate until the flush surface is flush with the bottom surface of the first recessed groove, the nail cap plate cooperates with the negative electrode cover plate to clamp the cover plate seat.

5. The cylindrical battery cover structure according to claim 1, characterized in that: The shell is a metal shell having a shell flange for connecting with the positive electrode cover plate, and the positive electrode cover plate is welded to the shell flange.

6. The cylindrical battery cover structure according to claim 1, characterized in that: The cover plate seat is provided with a closed groove; the closed groove is provided with an elastic closed portion; the positive electrode cover plate is provided with a ventilation groove for communicating with the closed groove; the positive electrode cover plate is provided with a pressure relief puncture portion on the side facing the elastic closed portion; the pressure relief puncture portion is used to puncture the elastic closed portion, and when the pressure relief puncture portion punctures the elastic closed portion, a ventilation gap is generated in the elastic closed portion, and the ventilation groove is connected to the installation cavity through the ventilation gap.

7. The cylindrical battery cover structure according to claim 6, characterized in that: The pressure relief puncture portion is a V-shaped spike.

8. The cylindrical battery cover structure according to claim 7, characterized in that: The ventilation groove is arranged on the V-shaped spike.

9. A secondary battery, characterized in that: It comprises a box body and the cylindrical battery cover plate structure according to any one of claims 1 to 8, wherein the cylindrical battery cover plate structure is arranged in the box body.

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