Battery top cover, lithium battery and battery pack

Abstract

The utility model provides a battery top cover, a lithium battery and a battery pack, the battery top cover is connected with a shell with an opening on one side, and the battery top cover comprises a cover plate, a pole and an anti-explosion valve; the cover plate is used for sealing an opening in one side of the shell; the pole is arranged on the cover plate, and a through hole is formed in the thickness direction of the cover plate in a penetrating manner, so that a tab extends into the through hole from the end part, close to the cover plate, of the through hole to be connected with the pole; in the assembling process, a pressure relief channel does not need to be additionally formed in the cover plate, the explosion-proof valve is assembled on the pressure relief channel, instead, only the explosion-proof valve needs to be assembled on the pole, the operation process is simplified, and simplicity, convenience and rapidness are achieved.

Description

Technical Field

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

[0002] The battery is a square hard-shell lithium battery. The battery includes a shell, a battery cell arranged in the shell, and a top cover for sealing the shell. The top cover includes a cover plate and a pole. The pole is installed on the cover plate. Patent CN220086323U provides a battery pole, a battery, and an electrical device. In this technical solution, the bottom of the pole is concave inward to form a groove, and the pole ear extends into the groove and connects with the side wall of the groove. At the same time, a pressure relief channel is opened on the cover plate, and the inside of the shell is connected with the outside through the pressure relief channel. The pressure relief channel is sealed by an explosion-proof valve, wherein the explosion-proof valve and the pressure relief channel constitute an explosion-proof component. When assembling the battery, the explosion-proof component and the pole need to be assembled separately, and the production process is cumbersome and inconvenient. Utility Model Content

[0003] In view of this, the utility model proposes a battery top cover, a lithium battery and a battery pack. By drilling a through hole in the pole and arranging the explosion-proof valve on the pole, there is no need to open a pressure relief channel on the cover plate. The explosion-proof valve is assembled to the pressure relief channel. It only needs to be assembled to the pole, which simplifies the operation process and is simple and quick.

[0004] The technical solution of the utility model is implemented as follows: the utility model provides a battery top cover, which is connected to a shell body with an opening on one side, and the battery top cover includes a cover plate, a pole and an explosion-proof valve; the cover plate is used to seal the opening on one side of the shell body, the pole is arranged on the cover plate, and a through hole is penetrated along the thickness direction of the cover plate, so that the pole ear extends from the end of the through hole close to the cover plate into the through hole and is connected to the pole; the explosion-proof valve cover is arranged on the through hole of the pole.

[0005] On the basis of the above technical solution, preferably, the pole comprises a first flange, the first flange is located on a side of the through hole close to the shell, and the pole lug extends into the through hole and overlaps with the first flange.

[0006] On the basis of the above technical solution, preferably, the pole further includes a second flange, the second flange is located at the upper part of the pole, and the second flange is used to connect the cover plate and the pole.

[0007] More preferably, the pole further includes a third flange, the third flange is arranged inside the through hole, the third flange is located between the first flange and the second flange, and the explosion-proof valve overlaps the top of the third flange.

[0008] Preferably, a receiving portion is provided at an end of the third flange away from the shell, so as to connect the explosion-proof valve to the receiving portion.

[0009] Preferably, the battery top cover also includes a plastic ring and a welding ring; the plastic ring is arranged between the cover plate and the pole to separate the cover plate and the pole; the welding ring is arranged between the plastic ring and the cover plate to connect the plastic ring and the cover plate.

[0010] The invention provides a lithium battery, comprising a shell, a battery core and the battery top cover.

[0011] The present invention also provides a battery pack, comprising a plurality of the above-mentioned lithium batteries, wherein a bus is connected between two adjacent lithium batteries, the bus is connected to the battery top cover of each lithium battery, and the bus is sleeved on the outside of the pole of the battery top cover.

[0012] The battery cover, lithium battery and battery pack of the utility model have the following beneficial effects compared with the prior art:

[0013] (1) In the present invention, the pole is provided with a through hole along the thickness direction of the cover plate, which has the function of connecting the shell with the outside world. The explosion-proof valve is arranged on the pole. Since the pole can connect the shell with the outside world, it has the function of pressure relief, replacing the original pressure relief channel. During the assembly process, there is no need to open another pressure relief channel on the cover plate and assemble the explosion-proof valve to the pressure relief channel. Instead, it is only necessary to assemble the explosion-proof valve to the pole, which simplifies the operation process and is simple and quick.

[0014] (2) The explosion-proof valve, the bus bar and the pole are integrated together, and the high integration reduces the production cost.

[0015] (3) The third flange is arranged on a side of the cover plate close to the shell. Since the explosion-proof valve is installed on the third flange, the explosion-proof valve does not protrude from the cover plate, thereby fully utilizing the space in the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A three-dimensional diagram of a lithium battery of the present utility model;

[0018] Figure 2 for Figure 1 sectional view of

[0019] Figure 3 for Figure 2 An enlarged view of part A;

[0020] Figure 4 for Figure 1 A cross-sectional view of the pole in;

[0021] Figure 5 for Figure 1 Assembly diagram of multiple lithium batteries in.

[0022] Figure numerals: lithium battery 1000, battery top cover 100, cover plate 1, pole 2, first flange 21, second flange 22, third flange 23, receiving portion 231, through hole 24, explosion-proof valve 3, plastic ring 4, welding ring 5 shell 200, battery cell 300, pole ear 400, bus bar 500. DETAILED DESCRIPTION

[0023] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, combined Figure 2-4 The utility model provides a battery top cover 100, which is connected to a shell body 200 with an opening on one side. The battery top cover 100 includes a cover plate 1, a pole 2 and an explosion-proof valve 3; the cover plate 1 is used to seal the opening on one side of the shell body 200, the pole 2 is arranged on the cover plate 1, and a through hole 24 is penetrated along the thickness direction of the cover plate 1, so that the pole ear 400 extends from the end of the through hole 24 close to the cover plate 1 into the through hole 24 and is connected to the pole 2; the explosion-proof valve 3 is covered on the through hole 24 of the pole 2.

[0025] In the above technical solution, there is no restriction on the connection method between the cover plate 1 and the pole 2, and the connection can be performed by welding or the like. Since the pole 2 is generally made of a conductive material and the pole 2 is connected to the cover plate 1, in order to prevent the cover plate 1 from being charged, an insulating material is generally provided between the cover plate 1 and the pole 2 to isolate the pole 2 from the cover plate 1. The present application does not limit the specific material of the insulating material, and it can be selected according to the specific situation. The pole 2 is provided with a through hole 24 along the thickness direction of the cover plate 1, so that the pole ear 400 extends from the end of the through hole 24 close to the cover plate 1 into the through hole 24 and connects with the pole 2, wherein the present application does not limit the specific shape of the through hole 24, which can be a columnar through hole, a cubic through hole, etc., as long as the housing 200 can be connected to the outside through the through hole 24, and the specific connection method of the pole ear 400 and the pole 2 is not limited. In some embodiments, in order to make the pole ear 400 firmly connected to the pole 2, the pole ear 400 and the pole 2 are mostly connected by welding. The explosion-proof valve 3 is covered on the through hole 24 of the pole 2.

[0026] In the present invention, the pole 2 is penetrated with a through hole 24 along the thickness direction of the cover plate 1, which has the function of connecting the shell 200 with the outside world. The explosion-proof valve 3 is arranged on the pole 2. Since the pole 2 can connect the shell 200 with the outside world, it has the function of pressure relief, replacing the original pressure relief channel. During the assembly process, there is no need to open another pressure relief channel on the cover plate 1 to assemble the explosion-proof valve 3 to the pressure relief channel. Instead, it is only necessary to assemble the explosion-proof valve 3 to the pole 2, which simplifies the operation process and is simple and quick.

[0027] In some embodiments, the battery top cover 100 also includes a plastic ring 4 and a welding ring 5; the plastic ring 4 is arranged between the cover plate 1 and the pole 2 to separate the cover plate 1 and the pole 2; the welding ring 5 is arranged between the plastic ring 4 and the cover plate 1 to connect the plastic ring 4 and the cover plate 1, and the plastic ring 4 serves to isolate the cover plate 1 and the pole 2 to prevent the cover plate 1 from being charged. The connection method between the plastic ring 4 and the pole 2 and the welding ring 5 is not limited, and the connection can be achieved by means of adhesive or the like. The function of the welding ring 5 is to firmly connect the pole 2 and the cover plate 1 to prevent the pole 2 from falling off. The present application does not limit the specific shapes of the plastic ring 4 and the welding ring 5.

[0028] In the new technical solution, if Figure 2 and 3As shown, the pole 2 includes a first flange 21, which is located on a side of the through hole 24 close to the shell 200, and the pole lug 400 extends into the through hole 24 and overlaps with the first flange 21. One of the purposes of providing the first flange 21 is to facilitate the connection between the pole 2 and the pole lug 400 and prevent the pole lug 400 from falling off. In some embodiments, the first flange 21 is formed by extending the end of the pole 2 close to the shell 200 inward. The present application does not limit the specific connection method between the pole lug 400 and the first flange 21. In some embodiments, in order to more tightly connect the pole lug 400, the pole lug 400 is welded to the first flange 21. In other embodiments, in order to ensure the supporting strength of the first flange 21, the thickness of the first flange 21 is not less than 0.5 mm. In order to strengthen the supporting strength of the first flange 21, reinforcing ribs, honeycomb holes, etc. can also be provided on its surface.

[0029] It is understandable that the cover plate 1 is provided with perforations along its thickness direction, and the battery top cover 100 also includes a receiving plate, which is located on the side of the cover plate 1 away from the explosion-proof valve 3, and the receiving plate is connected to the cover plate 1. The end of the pole 2 close to the shell 200 is located on the receiving plate through the perforations. In this technical solution, the specific shape of the receiving plate is not limited, as long as it can be used to place the pole 2. When the pole 2 is assembled on the cover plate 1, a part of the pole 2 sinks into the shell 200 of the lithium battery 1000, reducing the volume of the pole 2 exposed to the outside, making more full use of the space inside the shell 200 of the lithium battery 1000, and improving the utilization rate of the shell 200 space. In some embodiments, in order to improve the force strength of the receiving plate, the thickness range of the receiving plate can be set to be not less than 0.8mm.

[0030] Furthermore, the pole 2 further comprises a second flange 22, the second flange 22 is located at the upper part of the pole 2, and the second flange 22 is used to connect the cover plate 1 and the pole 2. Figure 3 As shown, the present application adds the second flange 22 to the pole 2. In some embodiments, the second flange 22 is formed by extending outward from the end of the pole 2 away from the shell 200. The second flange 22 is connected to the cover plate 1. The pole 2 is connected to the cover plate 1 through the second flange 22, which can make the pole 2 and the cover plate 1 more firmly connected, thereby preventing the pole 2 from falling off. In some embodiments, in order to ensure the supporting strength of the second flange 22, the thickness of the second flange 22 is not less than 0.5 mm. In order to strengthen the supporting strength of the second flange 22, reinforcing ribs, honeycomb holes, etc. can also be provided on its surface.

[0031] Furthermore, the pole 2 also includes a third flange 23, which is arranged inside the through hole 24, and the third flange 23 is located between the first flange 21 and the second flange 22. The explosion-proof valve 3 overlaps the third flange 23. The purpose of providing the third flange 23 is to facilitate the connection between the third flange 23 and the explosion-proof valve 3 to prevent the explosion-proof valve 3 from falling off. The present application does not limit the specific structure of the third flange 23, as long as it can be used to connect the explosion-proof valve 3. In some embodiments, in order to more firmly connect the explosion-proof valve 3 to the third flange 23, a receiving portion 231 is provided on the third flange 23. Specifically, as Figure 4 As shown, the receiving portion 231 is a groove-shaped portion formed by a depression at the end of the third flange 23 away from the housing 200 , which can better limit the explosion-proof valve 3 .

[0032] In some embodiments, the third flange 23 is located on a side of the cover plate 1 close to the shell 200 , and the explosion-proof valve 3 is installed on the third flange 23 , so that the explosion-proof valve 3 is disposed in the shell 200 , making full use of the space in the shell 200 .

[0033] It should be noted that the first flange 21, the third flange 23 and the second flange 22 are arranged along the thickness direction of the cover plate 1. If the thickness direction of the cover plate 1 is set as the high direction, there is a certain height difference between the first flange 21, the third flange 23 and the second flange 22. The height space between the first flange 21 and the third flange 23 is the bending space of the pole ear 400, and the height space between the third flange 23 and the second flange 22 is the blasting space.

[0034] The present application also provides a lithium battery 1000, comprising a housing 200, a battery cell 300 and the battery top cover 100. The lithium battery 1000 of the present application installs the explosion-proof valve 3 on the pole 2, which simplifies the assembly process and is simple and quick.

[0035] In the above technical solution, the lithium battery 1000 includes all the technical solutions and beneficial effects of the aforementioned battery top cover 100, which will not be described one by one here.

[0036] The present application also provides a battery pack, comprising a plurality of the lithium batteries 1000, wherein a bus 500 is connected between two adjacent lithium batteries 1000, wherein the bus 500 is connected to the battery top cover 100 of each lithium battery 1000, and wherein the bus 500 is sleeved on the outside of the pole 2 of the battery top cover 100, wherein the explosion-proof valve 3, the bus 500 and the pole 2 are integrated together, and the high integration reduces the production cost.

[0037] 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, improvements, etc. 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 top cover connected to a housing (200) having an opening on one side, characterized in that: The battery top cover comprises a cover plate (1), a pole (2) and an explosion-proof valve (3); A cover plate (1) used for sealing an opening on one side of the housing (200); A pole (2) is arranged on the cover plate (1), and a through hole (24) is provided along the thickness direction of the cover plate (1), so that a pole lug (400) can extend from the end of the through hole (24) close to the cover plate (1) into the through hole (24) to be connected to the pole (2); An explosion-proof valve (3) is covered on the through hole (24) of the pole (2).

2. The battery top cover according to claim 1, characterized in that: The pole (2) comprises a first flange (21), the first flange (21) is located on a side of the through hole (24) close to the housing (200), and the pole lug (400) extends into the through hole (24) and overlaps the first flange (21).

3. The battery top cover according to claim 2, characterized in that: The pole (2) further comprises a second flange (22), wherein the second flange (22) is located at the upper part of the pole (2), and the second flange (22) is used to connect the cover plate (1) and the pole (2).

4. The battery top cover according to claim 3, characterized in that: The pole (2) further comprises a third flange (23), the third flange (23) being arranged inside the through hole (24), the third flange (23) being located between the first flange (21) and the second flange (22), and the explosion-proof valve (3) being overlapped with the top of the third flange (23).

5. The battery top cover as claimed in claim 4, characterized in that: The end of the third flange (23) away from the housing (200) is provided with a receiving portion (231) for connecting the explosion-proof valve (3) to the receiving portion (231).

6. The battery top cover according to claim 1, characterized in that: The battery top cover (100) further comprises a plastic ring (4) and a welding ring (5); A plastic ring (4) is arranged between the cover plate (1) and the pole (2) to separate the cover plate (1) and the pole (2); A welding ring (5) is arranged between the plastic ring (4) and the cover plate (1) and is used to connect the plastic ring (4) and the cover plate (1).

7. A lithium battery, characterized in that: It comprises a shell (200), a battery cell (300), and a battery top cover (100) as claimed in any one of claims 1 to 6.

8. A battery pack, characterized in that: The invention comprises a plurality of lithium batteries (1000) as claimed in claim 7, wherein a busbar (500) is connected between two adjacent lithium batteries (1000), the busbar (500) is connected to the battery top cover (100) of each lithium battery (1000), and the busbar (500) is sleeved on the outside of the pole (2) of the battery top cover (100).

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