CN-122000651-A - Battery cell, battery and electricity utilization device

Abstract

The embodiment of the application provides a battery monomer, a battery and an electric device. The battery cell includes an electrode assembly, a case, and an electrode terminal. The electrode assembly includes a first tab. The case is for accommodating the electrode assembly. The electrode terminal is arranged on the shell and is electrically connected with the first tab, the electrode terminal is provided with a first through hole, and the first through hole is used for injecting electrolyte into the inner space of the shell. Through set up the first through-hole that is used for injecting into electrolyte on electrode terminal, can reduce the deformation of casing at the notes liquid in-process, simplify the structure of battery monomer, reduce the influence of first through-hole to casing intensity.

Inventors

• CHEN SHENGWANG
• GUO ZHIJUN
• WANG PENG

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260508

Application Date

20220822

Priority Date

20210823

Claims (20)

1. 1. A battery cell, comprising: An electrode assembly including a first tab; A case for accommodating the electrode assembly; and the electrode terminal is arranged on the shell and is electrically connected with the first tab, and is provided with a first through hole used for injecting electrolyte into the inner space of the shell.
2. 2. The battery cell of claim 1, wherein the electrode terminal is electrically connected to the first tab by at least one first weld.
3. 3. The battery cell of claim 2, wherein the number of first welds is one, the first welds extending in a circumferential direction of the first through-hole and surrounding at least a portion of the first through-hole.
4. 4. The battery cell of claim 3, wherein the first weld surrounds only a portion of the first through hole along a circumference of the first through hole.
5. 5. The battery cell of claim 3, wherein the first weld surrounds the first through hole at an angle α,180 ° or less α or less 360 °.
6. 6. The battery cell according to claim 2, wherein the first welding portions are plural, and the plural first welding portions are disposed at intervals along the circumferential direction of the first through hole.
7. 7. The battery cell of claim 6, wherein any adjacent two of the first weld portions are spaced apart by an angle of less than 30 ° in the circumferential direction of the first through hole.
8. 8. The battery cell of claim 6, wherein each of the first welds extends in a radial direction of the first through hole.
9. 9. The battery cell according to claim 2, wherein a depth of the first welded portion in an axial direction of the first through hole is h; a minimum distance between the first welding part and the first through hole in the radial direction of the first through hole is d; d and h are satisfied, and h/d is more than or equal to 0.1 and less than or equal to 0.6.
10. 10. The battery cell of claim 9, wherein d and h satisfy 0.2≤h/d≤0.5.
11. 11. The battery cell of claim 9, wherein 1.6mm +.d +.5.5 mm.
12. 12. The battery cell according to any one of claims 1-11, wherein, The electrode assembly is of a winding structure, and the electrode assembly is provided with a second through hole at the winding center; The first through hole communicates with the second through hole so that the electrolyte injected through the first through hole can flow into the second through hole.
13. 13. The battery cell of claim 12, wherein a projection of the first through hole at least partially overlaps a projection of the second through hole in an axial direction of the first through hole.
14. 14. The battery cell of claim 12, wherein a projection of the second through-hole is greater than a projection of the first through-hole in an axial direction of the first through-hole.
15. 15. The battery cell of claim 13, wherein a projection of the first through hole is located within a projection of the second through hole in an axial direction of the first through hole.
16. 16. The battery cell of claim 14, wherein the first via has a pore size of D1 and the second via has a pore size of D2, D1 and D2 satisfying 65% to 95% D1/D2.
17. 17. The battery cell according to claim 16, it is characterized in that D2 is more than or equal to D1+0.2mm.
18. 18. The battery cell of claim 12, further comprising a current collecting member for electrically connecting the electrode terminal and the first tab; The current collecting member includes a third through hole, at least a portion of which is provided between the first through hole and the second through hole.
19. 19. The battery cell of claim 18, wherein a projection of the third through hole is smaller than a projection of the second through hole in an axial direction of the first through hole.
20. 20. The battery cell of claim 18, wherein a projection of the third through hole is greater than a projection of the first through hole in an axial direction of the first through hole.

Description

Battery cell, battery and electricity utilization device The application is a divisional application of an application patent application with the application date of 2022, 8-month and 22-date, the application number of 202280007864.9 and the name of battery cell, battery and power utilization device. Technical Field The application relates to the technical field of batteries, and in particular relates to a battery cell, a battery and an electric device. Background Battery cells are widely used in electronic devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. The battery cells may include cadmium-nickel battery cells, hydrogen-nickel battery cells, lithium ion battery cells, secondary alkaline zinc-manganese battery cells, and the like. In the development of battery technology, how to simplify the structure of a battery cell is one of the research directions in battery technology. Disclosure of Invention The application provides a battery cell, a battery and an electric device, which can simplify the structure of the battery cell. In a first aspect, embodiments of the present application provide a battery cell including an electrode assembly, a case, and an electrode terminal. The electrode assembly includes a first tab. The case is for accommodating the electrode assembly. The electrode terminal is arranged on the shell and is electrically connected with the first tab, the electrode terminal is provided with a first through hole, and the first through hole is used for injecting electrolyte into the inner space of the shell. In the technical scheme, the first through hole for injecting the electrolyte is formed in the electrode terminal, so that deformation of the shell in the electrolyte injection process can be reduced, the structure of the battery cell is simplified, and the influence of the first through hole on the strength of the shell is reduced. In some embodiments, the electrode terminal is electrically connected to the first tab through at least one first weld. In the technical scheme, the first welding part can reduce the resistance between the electrode terminal and the first tab and improve the overcurrent capacity. In some embodiments, the number of first welds is one, the first welds extending in a circumferential direction of the first through hole and surrounding at least a portion of the first through hole. In the above technical solution, the first welding portion may increase the strength of the region of the electrode terminal around the first through hole, and reduce the deformation of the electrode terminal under the impact of the electrolyte. In some embodiments, the first weld surrounds only a portion of the first through hole along a circumference of the first through hole. In the above technical scheme, the periphery of the first through hole is not closed by the first welding part, and the gap between the electrode terminal and the part welded to the electrode terminal is not blocked by the first welding part, so that part of electrolyte flowing in through the first through hole can pass through the gap, thereby improving the efficiency of electrolyte injection. In some embodiments, the first weld surrounds the first through hole at an angle alpha, alpha is more than or equal to 180 degrees and less than or equal to 360 degrees. Α is positively correlated with the flow area of the first weld. The smaller α is, the smaller the overcurrent area of the first welded portion is, and the higher the heat generation when the current flows through the first welded portion is. According to the technical scheme, alpha is limited to 180-360 degrees, so that the first welding part meets the requirements of the battery cell on overcurrent capacity and temperature rise. In some embodiments, the first welding parts are a plurality of, and the plurality of first welding parts are arranged at intervals along the circumferential direction of the first through hole. Under the premise of a certain total area, compared with the scheme of arranging one first welding part, the scheme of arranging the first welding parts into a plurality of welding parts can reduce the power of single welding and reduce heat generation. In some embodiments, the spacing angle β of any adjacent two first welds in the circumferential direction of the first through hole is less than 30 °. The greater the value of the angle beta, the more sparse the distribution of the plurality of first welding portions, the smaller the total overcurrent area of the plurality of first welding portions, and the less the value of the angle beta, the denser the distribution of the plurality of first welding portions, and the greater the total overcurrent area of the plurality of first welding portions. The embodiment of the application limits beta to be less than 30 degrees so as