Battery cover plate and battery thereof

Abstract

The utility model provides a battery cover plate and a battery thereof in order to solve the problem that the distance between a top cover plate and a cylinder part in an existing button battery cover plate structure is relatively short, and external short circuit of the battery is easily caused during metal lap joint or high-temperature and high-humidity test. The battery cover plate comprises a pole, a top cover plate and an insulating part, a through hole is formed in the top cover plate, one end of the pole is arranged in the through hole, the insulating part is arranged between the pole and the top cover plate, and the side, close to the pole, of the insulating part extends in the direction away from a pole core. According to the battery cover plate provided by the invention, one side, close to the pole column, of the insulating part extends towards the direction far away from the pole core, so that the pole column and the top cover plate can be effectively insulated, and the problem of external short circuit caused by metal lap joint or high-temperature test due to short distance between the top cover plate and the cylinder part in a button battery cover plate structure is effectively avoided.

Description

Technical Field

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

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] As an accessory in lithium-ion batteries, the battery cover plate plays a sealing role by isolating the internal and external environments after welding with the aluminum shell. Secondly, it connects the internal and external circuits and transmits the internal current of the battery to the outside through the pole of the cover plate, playing a guiding role.

[0004] The cover of a traditional button battery includes a top cover, a pole, an insulating gasket, etc. The pole includes a cylindrical part and a flat part. The insulating gasket is sleeved on the cylindrical part, and the insulating gasket is arranged between the horizontal part and the cover. The insulating gasket connects the top cover to the pole by hot melting. In this composite structure, since the distance between the top cover and the cylindrical part of the button battery is relatively close, when a metal overlap is arranged on the outside, it is more likely to cause an external short circuit of the battery due to the short circuit between the top cover and the pole due to the close distance between the positive and negative poles. Or when the battery is subjected to a high temperature and high humidity test, the top cover and the pole are also prone to short circuit, resulting in an external short circuit of the battery. Utility Model Content

[0005] The technical problem to be solved by the utility model is as follows: In the existing button-type battery cover structure, the distance between the top cover plate and the cylindrical part is relatively close, which may easily lead to external short circuit of the battery during metal overlap or high temperature and high humidity testing. The present application provides a battery cover and a battery thereof.

[0006] The present application provides a battery cover plate, comprising a pole, a top cover plate and an insulating member, wherein the top cover plate is provided with a through hole, one end of the pole is provided in the through hole, the insulating member is provided between the pole and the top cover plate, and the side of the insulating member close to the pole extends in a direction away from the pole core.

[0007] Preferably, the pole comprises a horizontal portion, a transition portion and a convex portion, the horizontal portion is connected to the convex portion through the transition portion, the convex portion is arranged in the through hole and extends out of the through hole in a direction away from the pole core; the horizontal portion is arranged on a side of the top cover plate facing the pole core;

[0008] The insulating member includes a main body and an extension portion, wherein the main body is arranged between the top cover plate and the horizontal portion, and the extension portion extends from the main body toward one side of the transition portion along the transition portion in a direction away from the pole core, and the extension portion is arranged between the top cover plate and the transition portion and the protrusion.

[0009] Preferably, the cross-sectional shape of the transition portion comprises an arc, and the radius R of the arc is 0.2-0.8 mm.

[0010] Preferably, the distance a between the outer wall of the through hole and the protrusion is ≥ 0.5 mm.

[0011] Preferably, the side of the extension portion away from the main body portion includes a first end and a second end, the first end is connected to the inner wall of the through hole, the second end is connected to the raised portion, the distance between the second end and the side of the horizontal portion away from the pole core is L1, the distance between the side of the raised portion away from the pole core and the side of the horizontal portion away from the pole core is L2, and L1<L2.

[0012] Preferably, the range of L2-L1 is 0.01 to 0.03 mm.

[0013] Preferably, a distance b between the second end portion and a plane on which a side of the top cover plate faces away from the horizontal portion is located is greater than 0.

[0014] Preferably, b is 0.01 to 0.03 mm.

[0015] In a second aspect, the present application provides a battery, comprising the battery cover described above.

[0016] Beneficial effects:

[0017] Compared with the prior art, the battery cover provided by the present application has an insulating part that extends on one side close to the pole toward the direction away from the pole core, which can effectively insulate the pole from the top cover, and effectively avoid the problem of metal overlap caused by the close distance between the top cover and the cylindrical part in the button-type battery cover structure, or external short circuit caused by high temperature testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the battery structure provided by this application;

[0019] Among them, 1. top cover plate; 2. pole; 201. raised portion; 202. transition portion; 203. horizontal portion; 3. insulating member; 301. main body; 302. extension portion; 4. pole core. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] In order to illustrate the technical solution of the present utility model, specific embodiments are provided below for illustration.

[0022] like Figure 1 As shown, the present application provides a battery cover plate, including a pole 2, a top cover plate 1 and an insulating member 3, wherein the top cover plate 1 is provided with a through hole, one end of the pole 2 is arranged in the through hole, the insulating member 3 is arranged between the pole 2 and the top cover plate 1, and the insulating member 3 extends from a side close to the pole 2 in a direction away from the pole core 4.

[0023] Specifically, the insulating member 3 is arranged between the pole 2 and the top cover plate 1, which can effectively prevent the pole 2 from contacting the top cover plate 1 and avoid a short circuit in the battery. The side of the insulating member 3 close to the pole 2 extends in a direction away from the pole core 4, such as Figure 1 As shown, the insulating member 3 is arranged between the top cover plate 1 and the pole 2, and the insulating member 3 on the side of the insulating member 3 close to the pole 2 extends in the direction away from the pole core 4. The extended part of the insulating member 3 isolates the pole 2 from the top cover plate 1, effectively avoiding the metal overlap caused by the close distance between the top cover plate and the cylindrical part in the button battery cover plate structure or the external short circuit problem caused by high temperature testing.

[0024] In the battery cover provided in the present application, the insulating part 3 extends from the side close to the pole 2 in the direction away from the pole core 4, which can effectively insulate the pole 2 from the top cover 1, and effectively avoid the metal overlap caused by the close distance between the top cover and the cylindrical part in the button-type battery cover structure or the external short circuit problem caused by high temperature testing.

[0025] In some embodiments, the pole 2 includes a horizontal portion 203, a transition portion 202 and a protruding portion 201, the horizontal portion 203 is connected to the protruding portion 201 through the transition portion 202, the protruding portion 201 is arranged in the through hole, and extends out of the through hole in a direction away from the pole core 4; the horizontal portion 203 is arranged on the side of the top cover plate 1 facing the pole core 4, the insulating member 3 includes a main body 301 and an extension portion 302, the main body 301 is arranged between the top cover plate 1 and the horizontal portion 203, the extension portion 302 extends from the side of the main body 301 toward the transition portion 202 along the transition portion 202 in a direction away from the pole core 4, and the extension portion 302 is arranged between the top cover plate 1 and the transition portion 202 and the protruding portion 201.

[0026] Specifically, Figure 1As shown, the main body 301 is arranged between the pole 2 and the horizontal part 203 to prevent the horizontal part 203 from contacting and short-circuiting with the pole 2. The structure of the main body 301 of the insulating member 3 is not limited and is determined based on the spatial shape formed by the side of the top cover plate 1 facing the pole core 4 and the side of the horizontal part 203 away from the pole core 4.

[0027] like Figure 1 As shown, the extension portion 302 of the insulating member 3 extends from the main body 301 toward one side of the transition portion 202 along the transition portion 202 of the pole 2 in a direction away from the pole core 4. The extension portion 302 insulates the top cover plate 1 and the raised portion 201, which can effectively avoid the metal overlap caused by the close distance between the top cover plate 1 and the raised portion 201 in the button-type battery cover structure or the external short circuit problem caused by high temperature testing.

[0028] The shape of the extension portion 302 is not limited in this application, and the shape of the extension portion 302 is determined according to the shape of the space formed between the protrusion 201, the transition portion 202 and the top cover plate 1. Figure 1 As shown, the cross-sectional shape of the extension portion 302 is irregular, and is an irregular figure formed by a combination of arcs and straight lines.

[0029] In some embodiments, the cross-sectional shape of the transition portion 202 includes an arc, and the radius R of the arc is 0.2-0.8 mm.

[0030] Specifically, limiting the radius R of the arc of the transition portion 202 in the pole 2 to 0.2-0.8 mm is helpful for diffusion of the glue layer and for the insulating member 3 to extend along the transition portion 202 in a direction away from the pole core 4 .

[0031] In some embodiments, the distance a between the outer wall of the through hole and the protrusion 201 is ≥ 0.5 mm.

[0032] Specifically, a is limited to be greater than or equal to 0.5 mm to avoid overlapping of metal dust and debris during the production process, which may cause a short circuit between the positive and negative electrodes.

[0033] In some embodiments, the side of the extension portion 302 away from the main body portion 301 includes a first end and a second end, the first end is connected to the inner wall of the through hole, the second end is connected to the protrusion 201, the distance between the second end and the side of the horizontal portion 203 away from the pole core 4 is L1, the distance between the side of the protrusion 201 away from the pole core 4 and the side of the horizontal portion 203 away from the pole core 4 is L2, L1<L2.

[0034] Specifically, the side of the extension part 302 away from the main body part 301 has two ends, namely a first end and a second end, the first end is connected to the pole 2, and the second end is connected to the protrusion 201. It is defined that L1<L2 to prevent the setting of the extension part 302 from increasing the overall height of the battery.

[0035] In some embodiments, L2-L1 ranges from 0.01 to 0.03 mm.

[0036] Specifically, L2 - L1 is limited to be within the range of 0.01 to 0.03 mm, which effectively insulates the protrusion 201 from the pole 2 without increasing the overall height of the battery.

[0037] In some embodiments, a distance b between the second end portion and a plane where a side of the top cover plate 1 facing away from the horizontal portion 203 is located is greater than 0.

[0038] Specifically, the distance b is limited to be greater than 0, and the extension portion 302 can fill the gap between the raised portion 201 and the top cover plate 1 to avoid moisture accumulation during high temperature and high humidity testing, thereby improving the safety performance of the battery.

[0039] In some embodiments, b is 0.01 to 0.03 mm.

[0040] Specifically, by limiting b to a range of 0.01 to 0.03 mm, the extension portion 302 can effectively fill the gap between the raised portion 201 and the top cover plate 1, thereby avoiding moisture accumulation during high temperature and high humidity testing and improving the safety performance of the battery.

[0041] In a second aspect, the present application provides a battery, comprising the battery cover described above.

[0042] The battery provided in the present application includes the above-mentioned battery cover structure, and the insulating member 3 extends on one side close to the pole 2 in the direction away from the pole core 4, which can effectively insulate the pole 2 from the top cover 1, and effectively avoid the metal overlap caused by the close distance between the top cover and the cylindrical part in the button-type battery cover structure or the external short circuit problem caused by high temperature testing.

[0043] In a third aspect, the present application provides a method for preparing a battery, comprising the following steps:

[0044] After the top cover plate 1 and the pole 2 are punched, the insulating member 3 is sleeved on the pole 2, and the protrusion 201 of the pole 2 is passed through the through hole of the top cover plate 1. At this time, the insulating member 3 is arranged between the top cover plate 1 and the horizontal portion 203. Then, the insulating member 3 is hot-pressed and composited. The insulating member 3 extends along the transition portion 202 of the pole 2 in a direction away from the pole core 4 to form an extension portion 302. The extension portion 302 is arranged between the protrusion 201, the transition portion 202 and the top cover plate 1; a battery cover plate is prepared;

[0045] The pole core 4 is placed in the shell, the pole ear and the horizontal part 203 are welded, and then baking and liquid injection are performed in this order. After the liquid injection is completed, the top cover plate 1 and the shell are welded and sealed to prepare a battery.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover, characterized in that: It includes a pole, a top cover plate and an insulating member. The top cover plate is provided with a through hole. One end of the pole is arranged in the through hole. The insulating member is arranged between the pole and the top cover plate. The side of the insulating member close to the pole extends away from the pole core.

2. The battery cover according to claim 1, characterized in that: The pole comprises a horizontal portion, a transition portion and a convex portion, wherein the horizontal portion is connected to the convex portion through the transition portion, the convex portion is arranged in the through hole and extends out of the through hole in a direction away from the pole core; the horizontal portion is arranged on a side of the top cover plate facing the pole core; The insulating member includes a main body and an extension portion, wherein the main body is arranged between the top cover plate and the horizontal portion, and the extension portion extends from the main body toward one side of the transition portion along the transition portion in a direction away from the pole core, and the extension portion is arranged between the top cover plate and the transition portion and the protrusion.

3. The battery cover according to claim 2, characterized in that: The cross-sectional shape of the transition portion includes an arc, and the radius R of the arc is 0.2 to 0.8 mm.

4. The battery cover according to claim 2, characterized in that: The distance a between the outer wall of the through hole and the protrusion is ≥0.5 mm.

5. The battery cover according to claim 2, characterized in that: The side of the extension portion away from the main body portion includes a first end and a second end, the first end is connected to the inner wall of the through hole, the second end is connected to the protrusion, the distance between the second end and the side of the horizontal portion away from the pole core is L1, the distance between the side of the protrusion away from the pole core and the side of the horizontal portion away from the pole core is L2, L1<L2.

6. The battery cover according to claim 5, characterized in that: The range of L2-L1 is 0.01~0.03mm.

7. The battery cover according to claim 5, characterized in that: A distance b between the second end portion and a plane where a side of the top cover plate faces away from the horizontal portion is located is greater than 0.

8. The battery cover according to claim 7, characterized in that: b is 0.01~0.03mm.

9. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 8.

Images