Cylindrical battery and electric device
By adjusting the electrolyte content, negative electrode compaction density, and shell tensile strength, the internal structure of the cylindrical battery was optimized, solving the stress impact problem caused by the expansion of the silicon-based negative electrode, improving the electrolyte distribution, and enhancing the battery's cycle performance and energy density.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2026-03-23
- Publication Date
- 2026-06-09
AI Technical Summary
When existing cylindrical batteries use silicon-based anodes, the stress impact caused by volume expansion during charging and discharging affects the dynamic distribution of the electrolyte, resulting in decreased battery cycle performance and insufficient energy density.
By synergistically adjusting the electrolyte content, the compaction density of the negative electrode, and the tensile strength of the casing, the internal structure of the battery is optimized, preventing the electrode pores from being squeezed and the electrolyte from being squeezed out, thus improving the electrolyte distribution.
It achieves synergistic optimization of battery cycle performance and energy density, improves battery fast charging performance and cycle life, and reduces side reactions between electrolyte and positive and negative electrodes.
Smart Images
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Figure SMS_2 
Figure SMS_3
Abstract
Claims
1. A cylindrical battery, comprising a casing, a cell, and an electrolyte, wherein the cell includes a negative electrode sheet, and the negative electrode sheet includes a negative electrode material layer, characterized in that, The electrolyte content in the cylindrical battery is set to ag, and the product of the compaction density of the negative electrode sheet and the thickness of the negative electrode material layer is bg / cm³. 3 Given that the shell has a tensile strength of c MPa and a diameter of ×μm, then the following condition is satisfied: 95.22≤(a×c) / b≤420.
06.
2. The cylindrical battery according to claim 1, characterized in that, The cylindrical battery satisfies: 198.01≤(a×c) / b≤266.
17.
3. The cylindrical battery according to claim 1 or 2, characterized in that, The electrolyte content in the cylindrical battery is 37.24~88.65 g.
4. The cylindrical battery according to claim 3, characterized in that, The electrolyte content in the cylindrical battery is 58.61~72.38 g.
5. The cylindrical battery according to claim 1 or 2, characterized in that, The compaction density of the negative electrode sheet is 1.3~1.5 g / cm³. 3 ; And / or, the thickness of the negative electrode material layer is 100~150 μm; And / or, the product of the compaction density of the negative electrode sheet and the thickness of the negative electrode material layer, bg / cm². 3 ×μm is 130~225g / cm 3 ×μm.
6. The cylindrical battery according to claim 5, characterized in that, The compacted density of the negative electrode sheet is 1.35~1.48 g / cm³. 3 ; And / or, the thickness of the negative electrode material layer is 110~120 μm; And / or, the product of the compaction density of the negative electrode sheet and the thickness of the negative electrode material layer, bg / cm². 3 The chromatogram (×μm) is 148.5~177.6 g / cm³. 3 ×μm.
7. The cylindrical battery according to claim 1 or 2, characterized in that, The tensile strength c MPa of the shell is 515~700 MPa.
8. The cylindrical battery according to claim 7, characterized in that, The tensile strength c MPa of the shell is 550~650 MPa.
9. The cylindrical battery according to claim 1 or 2, characterized in that, The housing may be a steel housing or an aluminum housing; And / or, the doping element of the shell includes at least one of C, Cr, Ni, Mo, Mn or Si.
10. The cylindrical battery according to claim 9, characterized in that, The content of element C is ≤0.08wt%; And / or, the Cr content is ≤0.03wt%; And / or, the Ni content is ≤2wt%; And / or, the content of Mo element is 2wt%~3wt%; And / or, the Mn content is 1.0wt%~1.6wt%; And / or, the Si content is 0.3wt%~0.7wt%.
11. The cylindrical battery according to claim 1 or 2, characterized in that, The negative electrode includes a silicon-based negative electrode with a silicon content of 3-30 wt%.
12. The cylindrical battery according to claim 1 or 2, characterized in that, The electrolyte contains lithium salt, and the lithium salt concentration is 0.9~1.8 mol / L; The lithium salt includes at least one of lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium perchlorate, lithium tetrafluoroborate, lithium dioxalate borate, lithium difluorooxalate borate, lithium trifluoromethanesulfonate, lithium bisfluorosulfonylimide, lithium bistrifluoromethanesulfonylimide, lithium difluorodioxalate phosphate, or lithium tetrafluorooxalate phosphate.
13. The cylindrical battery according to claim 12, characterized in that, The electrolyte has a dynamic viscosity of 3~15 mPa·s at 25°C.
14. An electrical appliance, characterized in that, The electrical device includes a cylindrical battery as described in any one of claims 1 to 13.