Cylindrical battery and battery pack

Abstract

The utility model belongs to the technical field of battery structures, and particularly discloses a cylindrical battery and a battery pack. The cylindrical battery comprises a shell, a roll core, a cover plate seat, a positive electrode cover plate and a negative electrode cover plate, 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 cover plate seat is provided with a sealing groove; an elastic sealing part is arranged in the sealing groove; the positive electrode cover plate is provided with a vent groove; and the positive electrode cover plate is provided with a pressure relief puncture part. When the air pressure in the mounting cavity is abnormal, the elastic sealing part deforms outwards under the action of the air pressure, so that the elastic sealing part abuts against the pressure relief puncturing part, the pressure relief puncturing part punctures the elastic sealing part, the mounting cavity communicates with the ventilation groove through the ventilation gap of the elastic sealing part, and the mounting cavity can communicate with the external space; therefore, the purpose of pressure relief of the cylindrical battery is achieved, explosion is avoided, a pressure relief valve welding process does not need to be performed on the cover plate when the cylindrical battery is assembled, the assembly cost is reduced, and the battery assembly efficiency is improved.

Description

Technical Field

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

[0002] In the prior art, to prevent abnormal internal pressure in the battery cell, a pressure relief valve is installed on the battery cover to ensure safe use of the battery. The battery cover is equipped with a dedicated pressure relief valve welding groove, where the pressure relief valve is welded to the welding groove to achieve a seal between the pressure relief valve and the cover. However, the pressure value of the pressure relief valve is significantly affected by fluctuations in the welding assembly process. If the pressure relief valve is not welded properly, it will lose its function. Furthermore, the welding process of the pressure relief valve is relatively complex and costly, resulting in higher battery assembly costs. Utility Model Content

[0003] The purpose of the utility model is to provide a cylindrical battery to solve the technical problem in the prior art that the welding process of the pressure relief valve of the cover plate is relatively complicated and the cost is high, which leads to high battery assembly cost.

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

[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] In which, 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 closed groove; the closed groove is provided with an elastic closing 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 closing portion; the pressure relief puncture portion is used to puncture the elastic closing portion, and when the pressure relief puncture portion punctures the elastic closing portion, the elastic closing portion generates a ventilation gap, and the ventilation groove is connected to the mounting cavity through the ventilation gap.

[0011] Preferably, the pressure relief puncture portion is a V-shaped spike.

[0012] Preferably, the ventilation groove is provided on the V-shaped spike.

[0013] Preferably, the ventilation groove is arranged at a position where the positive electrode cover plate is opposite to the closed groove, and the pressure relief puncture portion is arranged at the edge of the ventilation groove.

[0014] Preferably, the pressure relief puncture portion is a chamfered spike.

[0015] Preferably, the ventilation groove is a square groove, a circular groove or a waist-shaped groove.

[0016] Preferably, the cover seat is an elastic insulating rubber member.

[0017] Preferably, it also includes: a negative electrode nail, the cover plate seat is provided with a negative electrode nail channel connecting the second mounting groove and the mounting cavity, the negative electrode nail is arranged in the negative electrode nail channel, and the negative electrode cover plate is connected to the negative electrode of the winding core through the negative electrode nail.

[0018] Preferably, the shell is a metal shell having a shell flange for connecting to the positive electrode cover plate, the positive electrode cover plate is welded to the shell flange, and the positive electrode cover plate is connected to the positive electrode of the winding core through the metal shell.

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

[0020] The cylindrical battery and battery pack provided by the present invention have the following beneficial effects: the positive cover plate and the negative cover plate of the cylindrical battery are arranged on the cover plate seat, so that the positive and negative poles of the battery cell are arranged at the same end, and when the air pressure in the installation cavity is abnormal, the elastic sealing part will be deformed into an outer shape under the action of the air pressure, causing the elastic sealing part to abut against the pressure relief puncture part, and the pressure relief puncture part will puncture the elastic sealing part, so that the elastic sealing part produces a ventilation gap, allowing the installation cavity to be connected to the ventilation groove through the ventilation gap, so that the installation cavity can be connected to the external space, so as to achieve the purpose of relieving the pressure of the cylindrical battery and avoid explosion. When assembling the cylindrical battery, there is no need to perform the pressure relief valve welding process on the cover plate, which reduces the battery assembly steps, reduces the assembly cost, and improves the battery assembly efficiency.

[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 schematic structural diagram of a cylindrical battery according to an embodiment of the present invention;

[0023] Figure 2 It is a partial cross-sectional schematic diagram of a cylindrical battery according to an embodiment of the present utility model;

[0024] Figure 3 This is a schematic structural diagram of an embodiment of the present invention in which the pressure relief puncture portion is a V-shaped spike;

[0025] Figure 4 This is a schematic structural diagram of an embodiment of the utility model in which the pressure relief puncture portion is a single-sided chamfered spike;

[0026] Figure 5 This is a schematic structural diagram of an embodiment of the utility model in which the pressure relief puncture portion is a double-sided chamfered spike;

[0027] Figure 6 This is a schematic structural diagram of an embodiment of the utility model in which the ventilation groove is square or circular;

[0028] Figure 7 It is a structural schematic diagram of an embodiment of the utility model in which the ventilation groove is a waist-shaped groove.

[0029] In the figure, 100, shell; 110, shell flange; 200, winding core; 300, cover seat; 310, first mounting groove; 320, second mounting groove; 330, closing groove; 340, elastic closing part; 350, negative electrode nail channel; 400, positive electrode cover; 410, ventilation groove; 420, pressure relief puncture part; 500, negative electrode cover; 600, negative electrode nail. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Please also refer to Figures 1 to 7 , the cylindrical battery provided by the embodiment of the present invention is now described.

[0035] Reference Figures 1 to 4 The cylindrical battery of the embodiment of the present invention includes: a shell 100, a winding core 200, a cover plate seat 300, a positive electrode cover plate 400, and a negative electrode cover plate 500;

[0036] Among them, the shell 100 has an opening; the shell 100 has an installation cavity connected to the opening; the core 200 is arranged in the installation cavity; the cover seat 300 closes the opening; the cover seat 300 is provided with a first installation groove 310 and a second installation groove 320 on the side away from the core 200; the positive cover plate 400 is arranged in the first installation groove 310; the positive cover plate 400 is connected to the positive pole of the core 200; the negative cover plate 500 is arranged in the second installation groove 320; the negative cover plate 500 is connected to the negative pole of the core 200; that is, the positive cover plate 400 and the negative cover plate 500 are integrated on the cover seat 300, so that the positive pole and negative pole of the cylindrical battery can be at the same end.

[0037] The cover plate seat 300 is provided with a closed groove 330, and the closed groove 330 is provided with an elastic closed portion 340; the positive cover plate 400 is provided with a vent groove 410 for communicating with the closed groove 330; the vent groove 410 is communicated with the external air of the cylindrical battery; the positive cover plate 400 is provided with a pressure relief puncture portion 420 on the side facing the elastic closed portion 340; the pressure relief puncture portion 420 is used to puncture the elastic closed portion 340. When the pressure relief puncture portion 420 punctures the elastic closed portion 340, the elastic closed portion 340 generates a ventilation gap, and the vent groove 410 is connected to the installation cavity through the ventilation gap.

[0038] The elastic closing portion 340 is elastic and can be directly integrally formed with the cover seat 300. The cover seat 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 340 closes the closing groove 330, and the installation cavity is in a sealed state; when the air pressure in the installation cavity is abnormal, the elastic closing portion 340 will be deformed into shape under the action of the air pressure, causing the elastic closing portion 340 to abut against the pressure relief puncture portion 420, and the pressure relief puncture portion 420 will puncture the elastic closing portion 340, so that the elastic closing portion 340 produces a ventilation gap, allowing the installation cavity to be connected to the ventilation groove 410 through the ventilation gap of the elastic closing portion 340, 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.

[0039] The positive electrode cover plate 400 and the negative electrode cover plate 500 of the cylindrical battery of this embodiment are arranged on the cover plate seat 300, so that the battery cell can realize the design of the positive and negative electrodes being arranged at the same end. Moreover, when the air pressure in the installation cavity is abnormal, the elastic sealing portion 340 will be deformed into an outer shape under the action of the air pressure, causing the elastic sealing portion 340 to abut against the pressure relief puncture portion 420. The pressure relief puncture portion 420 will puncture the elastic sealing portion 340, so that the elastic sealing portion 340 produces a ventilation gap, allowing the installation cavity to be connected to the ventilation groove 410 through the ventilation gap, so that the installation cavity can be connected to the external space, so as to achieve the purpose of relieving pressure for the cylindrical battery and avoid explosion. Therefore, when assembling the cylindrical battery, there is no need to perform the pressure relief valve welding process on the cover plate, which reduces the battery assembly steps, reduces the assembly cost, and improves the battery assembly efficiency.

[0040] In some embodiments of the present invention, referring to Figures 1 to 3 The pressure relief puncture portion 420 is a V-shaped spike. The V-shaped spike is arranged on the side of the positive electrode cover plate 400 facing the sealing groove 330, and the tip of the V-shaped spike is facing the elastic sealing portion 340. When the elastic sealing portion 340 is deformed into its outer shape under the action of air pressure, the elastic sealing portion 340 directly contacts the tip of the V-shaped spike, so that the V-shaped spike punctures the elastic sealing portion 340, allowing the installation cavity to connect to the vent groove 410, thereby achieving the purpose of pressure relief.

[0041] On the basis of the above, 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 330 for pressure relief.

[0042] In some embodiments of the present invention, referring to Figures 4 to 7The vent groove 410 is arranged at a position on the positive electrode cover plate 400 that is opposite to the closed groove 330, so that the vent groove 410 can be better and more easily connected with the closed groove 330, and it is also convenient for processing; the pressure relief puncture portion 420 is arranged at the edge of the vent groove 410, so when the pressure relief puncture portion 420 punctures the elastic closed portion 340, the rupture of the elastic closed portion 340 can be aligned with the vent groove 410 to relieve pressure.

[0043] In some embodiments of the present invention, the pressure relief puncture portion 420 is a chamfered spike. The chamfered spike is easy to process, and the tip of the chamfered spike is sharper, which allows the pressure relief puncture portion 420 to puncture the elastic sealing portion 340 better. The chamfered spike can be a single-sided chamfered spike (such as Figure 4 As shown), it can also be a double-sided chamfered spike (as shown Figure 5 shown).

[0044] On the basis of the above, the ventilation groove 410 can be in various shapes, such as waist-shaped groove, square groove, circular groove and other shapes. Figure 6 The shape of the vent groove 410 is square. The square groove can make the tip of the chamfered spike of the pressure relief puncture portion 420 on the edge of the vent groove 410 more sharp. Figure 6 The shape of the ventilation groove 410 can also be circular, and the processing of a circular groove is easier than that of a square groove.

[0045] In some embodiments of the present invention, referring to Figure 7 The ventilation groove 410 is a waist-shaped groove, which can reduce the weight of the positive electrode cover 400, save materials, and save costs.

[0046] In some embodiments of the present invention, the housing 100 is a metal housing 100 having a housing flange 110 for connection to the positive electrode cover plate 400. The housing flange 110 is welded to the positive electrode cover plate 400, and the positive electrode cover plate 400 is electrically connected to the positive electrode of the winding core 200 through the metal housing 100. Welding the housing flange 110 of the metal housing 100 to the positive electrode cover plate 400 can increase the connection strength at 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, thereby achieving good electrical conductivity between the positive electrode cover plate 400 and the metal housing 100.

[0047] Some embodiments of the present invention further include: a negative electrode nail 600. The cover plate seat 300 is provided with a negative electrode nail channel 350 connecting the second mounting groove 320 and the mounting cavity. The negative electrode nail 600 is disposed within the negative electrode nail channel 350. The negative electrode cover plate 500 is electrically connected to the negative electrode of the winding core 200 through the negative electrode nail 600. It is understood that the cover plate seat 300 is an elastic insulating rubber member, and the negative electrode nail 600 is a rivet. The negative electrode cover plate 500 can be riveted to the cover plate seat 300 so that the negative electrode nail 600 cooperates with the negative electrode cover plate 500 to seal the cover plate seat 300 and prevent air leakage. In addition, the negative electrode nail 600 can also be other connecting parts so that the negative electrode nail 600 cooperates with the negative electrode cover plate 500 to seal the negative electrode nail channel 350 of the cover plate seat 300.

[0048] This embodiment also provides a battery pack, which can provide electrical energy for electrical equipment. The battery pack includes a box and the cylindrical batteries as described above, and the cylindrical batteries are arranged in the box.

[0049] The battery pack uses cylindrical batteries as mentioned above. The positive cover plate 400 and the negative cover plate 500 of the cylindrical battery are arranged on the cover plate seat 300, so that the battery cell can realize the design of setting the positive and negative poles at the same end. Moreover, when the air pressure in the installation cavity is abnormal, the elastic sealing portion 340 will be deformed into an outer shape under the action of the air pressure, causing the elastic sealing portion 340 to abut against the pressure relief puncture portion 420. The pressure relief puncture portion 420 will puncture the elastic sealing portion 340, so that the elastic sealing portion 340 produces a ventilation gap, allowing the installation cavity to be connected to the ventilation groove 410 through the ventilation gap, so that the installation cavity can be connected to the external space to achieve the purpose of relieving pressure for the cylindrical battery and avoid explosion. Therefore, when assembling the cylindrical battery, there is no need to perform the pressure relief valve welding process on the cover plate, which reduces the battery assembly steps, reduces the assembly cost, and improves the battery assembly efficiency.

[0050] 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, 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; In which, 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 closed groove; the closed groove is provided with an elastic closing 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 closing portion; the pressure relief puncture portion is used to puncture the elastic closing portion, and when the pressure relief puncture portion punctures the elastic closing portion, the elastic closing portion generates a ventilation gap, and the ventilation groove is connected to the mounting cavity through the ventilation gap.

2. The cylindrical battery according to claim 1, characterized in that: The pressure relief puncture portion is a V-shaped spike.

3. The cylindrical battery according to claim 2, characterized in that: The ventilation groove is arranged on the V-shaped spike.

4. The cylindrical battery according to claim 1, characterized in that The ventilation groove is arranged at a position where the positive electrode cover plate is opposite to the closed groove, and the pressure relief puncture portion is arranged at the edge of the ventilation groove.

5. The cylindrical battery according to claim 4, characterized in that: The pressure relief puncture portion is a chamfered sharp thorn.

6. The cylindrical battery according to claim 4, characterized in that: The ventilation groove is a square groove, a circular groove or a waist-shaped groove.

7. The cylindrical battery according to claim 1, characterized in that: The cover plate seat is an elastic insulating rubber part.

8. The cylindrical battery according to claim 1, characterized in that Also includes: The negative electrode nail is provided on the cover plate seat with a negative electrode nail channel communicating with the second mounting groove and the mounting cavity. The negative electrode nail is arranged in the negative electrode nail channel. The negative electrode cover plate is connected to the negative electrode of the winding core through the negative electrode nail.

9. The cylindrical battery according to claim 1, characterized in that: The shell is a metal shell having a shell flange for connecting to the positive electrode cover plate. The positive electrode cover plate is welded to the shell flange. The positive electrode cover plate is connected to the positive electrode of the winding core through the metal shell.

10. A battery pack, characterized in that: It comprises a box body and a cylindrical battery as claimed in any one of claims 1 to 9, wherein the cylindrical battery is arranged in the box body.

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