CN-119275510-B - Secondary battery and electricity utilization device

CN119275510BCN 119275510 BCN119275510 BCN 119275510BCN-119275510-B

Abstract

The application discloses a secondary battery and an electric device, comprising a shell, an electrode assembly, a top cover plate, an insulating part and a protruding part, wherein the top cover plate is connected with the shell, a liquid injection hole is formed in the top cover plate, the insulating part is connected with one side of the top cover plate, which faces the electrode assembly, the protruding part comprises an extending part and a blocking part, the extending part is connected with one side of the insulating part, which is far away from the top cover plate, the blocking part is connected with one side of the extending part, which is far away from the insulating part, and the orthographic projection of the blocking part on the top cover plate covers at least part of the liquid injection hole, at least one flow guide hole is formed in the extending part and communicated with the liquid injection hole, the sum of the areas of the at least one flow guide hole is S 1 mm 2 , and the area of the liquid injection hole is S 2 mm 2 , and S 1 /S 2 is more than or equal to 1 and less than or equal to 4. After the secondary battery meets the range that S 1 /S 2 is less than or equal to 1 and less than or equal to 4, the strength of the protruding part is improved, and meanwhile, the liquid injection efficiency of the electrolyte is further improved, so that the production rate of the secondary battery is remarkably increased.

Inventors

ZHOU JIE
QIN JISHENG
MA QING
YUAN CHENG
YANG WEI

Assignees

欣旺达动力科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20240802

Claims (12)

1. A secondary battery, characterized by comprising: a housing having a receiving cavity; the electrode assembly is arranged in the accommodating cavity; The top cover plate is connected with the shell and covers the accommodating cavity, the top cover plate is provided with a thickness direction X, the top cover plate is provided with a liquid injection hole, and the liquid injection hole penetrates through the top cover plate along the thickness direction X; the insulating piece is arranged in the accommodating cavity, is connected with one side of the top cover sheet, which faces the electrode assembly, and is provided with a through hole which penetrates through the insulating piece along the thickness direction X and is communicated with the liquid injection hole; The protrusion piece comprises an extension part and a blocking part, wherein the extension part is connected with one side of the insulating piece far away from the top cover plate, the extension part is arranged around the through hole, the extension part comprises a plurality of extension sections which are arranged around the through hole, the through hole is provided with a radial direction Y perpendicular to the thickness direction X, the extension section is provided with an eighth surface far away from the through hole and a ninth surface close to the through hole in the radial direction Y, the extension section is also provided with a tenth surface which is positioned between the eighth surface and the ninth surface and is respectively connected with the eighth surface and the ninth surface, the blocking part is connected with one side of the extension part far away from the insulating piece, and the orthographic projection of the blocking part on the top cover plate along the thickness direction X is used for covering at least part of the liquid injection hole, the extension part is provided with at least one flow guide hole, the flow guide hole is communicated with the liquid injection hole, the area S 1 mm 2 is equal to or more than or less than or equal to 3 mm, and the total area S3224 is equal to or less than or equal to 3. 1 /S 2 ≤4,1.2≤H 1 ×S 1 H. 1 /S 2 ≤4,1.2≤H 1 ×S 1 , S. 1 /S 2 ≤4,1.2≤H 1 ×S 1 is equal to or less than or equal to 3. 1 /S 2 ≤4,1.2≤H 1 ×S 1 .1; The first reinforcement is connected with the tenth surface of the adjacent extension section, and the first reinforcement, the extension section and the blocking part jointly enclose to form the flow guiding hole, or the first reinforcement is connected with the ninth surface of any two extension sections, and the extension section, the blocking part and the insulating body part jointly enclose to form the flow guiding hole.
2. The secondary battery according to claim 1, wherein the secondary battery satisfies 2.4≤H 1 ×S 1 ≤30.
3. The secondary battery according to claim 1, wherein the insulating member includes first protruding portions provided at both sides of the insulating body portion, the first protruding portions being connected with the insulating body portion toward one side of the electrode assembly; The insulating body part is provided with a first surface facing the top cover sheet and connected with the top cover sheet in the thickness direction X, the first protruding part is provided with a second surface facing the electrode assembly in the thickness direction X, the blocking part is provided with a third surface facing the electrode assembly in the thickness direction X, a maximum distance H 2 mm is arranged between the first surface and the second surface in the thickness direction X, and a maximum distance H 3 mm is arranged between the first surface and the third surface in the thickness direction X, so that H 3 ≤H 2 is satisfied.
4. The secondary battery according to claim 3, wherein the secondary battery satisfies at least one of the following characteristics: c)H 3 ≤H 2 -1; d)1≤H 2 ≤10; e)0.5≤H 3 ≤8。
5. The secondary battery according to claim 3, wherein the top cap sheet comprises a top cap body having fourth and fifth surfaces facing away from each other in the thickness direction X, the fourth surface facing the electrode assembly and being connected to the first surface, and a second protruding portion connected to the fourth surface and disposed around the filling hole, the second protruding portion being located in the through hole, the second protruding portion having a sixth surface facing the electrode assembly in the thickness direction X, wherein the first and sixth surfaces have a maximum distance H 4 mm in the thickness direction X, satisfying H 4 ＜H 3 .
6. The secondary battery according to claim 5, wherein the secondary battery satisfies at least one of the following characteristics: f)H 3 ≥H 4 +1; g)0.4<H 4 ≤3。
7. the secondary battery according to claim 3, wherein the insulative body portion further has a seventh surface facing the electrode assembly in the thickness direction X, the seventh surface and the first surface being disposed away from each other in the thickness direction X; One end of the extension section is connected with the seventh surface, and one end of the extension section, which is far away from the seventh surface, is connected with the blocking part.
8. The secondary battery according to claim 3, wherein the insulative body portion further has a seventh surface facing the electrode assembly in the thickness direction X, the seventh surface and the first surface being disposed away from each other in the thickness direction X; The extending part comprises a plurality of extending sections which are arranged around the through hole, and the extending sections, the blocking part and the insulating body part jointly enclose into the diversion hole; one end of the extending section is connected with the seventh surface, and one end of the extending section, which is far away from the seventh surface, is connected with the blocking part; The secondary battery further includes: and the second reinforcing piece is arranged in the accommodating cavity and is respectively connected with the seventh surface and the eighth surface.
9. The secondary battery according to claim 1, wherein the extension portion is provided with a plurality of the flow guide holes, the plurality of flow guide holes being disposed at intervals along a circumferential direction of the extension portion.
10. The secondary battery of claim 7, wherein the extension section includes a first connection section and a first bending section, the first connection section is connected to the seventh surface, the first bending section is connected to a side of the first connection Duan Yuan away from the seventh surface, and a side of the first bending section away from the first connection section is connected to the blocking portion, wherein the first reinforcement, the first connection section, the first bending section, and the blocking portion together enclose the flow guiding hole.
11. The secondary battery according to claim 7, wherein the blocking portion includes a second connecting section, a second bending section, and a third connecting section, the second connecting section is connected to an end of the extending section away from the seventh surface, the second bending section is connected to a side of the second connecting section away from the extending section, and the third connecting section is connected to a side of the second bending section away from the second connecting section, wherein the first reinforcing member, the extending section, the second connecting section, the second bending section, and the third connecting section together enclose the flow guiding hole.
12. An electric device comprising the secondary battery according to any one of claims 1 to 11 for supplying electric power to the electric device.

Description

Secondary battery and electricity utilization device The application is a divisional application of patent application of the application with the application number 202411059056.4, the application date 2024, the month 08 and the application date 02 and the name of secondary battery and electric device. Technical Field The application belongs to the technical field of batteries, and particularly relates to a secondary battery and an electric device. Background The top cap assembly of the secondary battery is provided with a liquid injection hole, and electrolyte needs to be injected into the electrode assembly through the liquid injection hole during the production of the electrode assembly. However, when the injection pressure and the injection speed are too high, the force of the electrolyte directly impacting the diaphragm on the electrode assembly is synchronously increased, so that the diaphragm collapses down, the problem of short circuit of the positive electrode plate and the negative electrode plate occurs, and the production rate of the battery is reduced. Normally, a boss for relieving electrolyte impact is arranged on the top cover assembly, but the structure and the position of the boss can directly influence the liquid injection efficiency, and the boss is too low in strength and can be broken by the electrolyte so as not to have a buffering effect. Disclosure of Invention The embodiment of the application provides a secondary battery and an electric device, which solve the problems of low liquid injection efficiency and easy damage of a boss by controlling the structure and the position of the boss on a top cover assembly. The secondary battery provided by the embodiment of the application comprises: a housing having a receiving cavity; the electrode assembly is arranged in the accommodating cavity; The top cover plate is connected with the shell and covers the accommodating cavity, the top cover plate is provided with a thickness direction X, the top cover plate is provided with a liquid injection hole, and the liquid injection hole penetrates through the top cover plate along the thickness direction X; The insulating piece is arranged in the accommodating cavity, connected with one side of the top cover plate, facing the electrode assembly, and provided with a through hole which penetrates through the insulating piece along the thickness direction X and is communicated with the liquid injection hole; The device comprises a top cover plate, a protruding piece, a blocking part, at least one liquid injection hole, a liquid guide hole and a liquid guide hole, wherein the protruding piece comprises an extending part and a blocking part, the extending part is connected with one side of the insulating piece, which is far away from the top cover plate, and the extending part is arranged around the through hole; the sum of the areas of the at least one diversion hole is S 1 mm2, and the area of the liquid injection hole is S 2mm2, so that S 1/S2 is more than or equal to 1 and less than or equal to 4. In some embodiments, the extension has a thickness of H 1 mm, and the secondary battery further satisfies 1.2≤H 1×S1≤120. In some embodiments, the secondary battery further satisfies 2.4≤H 1×S1≤30. In some embodiments, the secondary battery further satisfies at least one of the following features: a)0.6≤H1≤2; b)2≤S1≤60。 In some embodiments, the insulating member includes an insulating body part and first protruding parts provided at both sides of the insulating body part, the first protruding parts being connected with the insulating body part toward one side of the electrode assembly; The insulating body part is provided with a first surface facing the top cover sheet and connected with the top cover sheet in the thickness direction X, the first protruding part is provided with a second surface facing the electrode assembly in the thickness direction X, the blocking part is provided with a third surface facing the electrode assembly in the thickness direction X, a maximum distance H mm is arranged between the first surface and the second surface in the thickness direction X, and a maximum distance H 3 mm is arranged between the first surface and the third surface in the thickness direction X, so that H 3≤H2 is satisfied. In some embodiments, the secondary battery further satisfies at least one of the following features: c)H3≤H2-1; d)1≤H2≤10; e)0.5≤H3≤8。 In some embodiments, the top cap sheet comprises a top cap body and a second protruding part, wherein the top cap body is provided with a fourth surface and a fifth surface which are opposite in the thickness direction X, the fourth surface faces the electrode assembly and is connected with the first surface, the second protruding part is connected with the fourth surface and is arranged around the liquid injection hole, the second protruding part is positioned in the through hole, the second protruding part is provided with a sixth surface facing the e