Battery cell, method of manufacturing the same, and use thereof

CN122118018APending Publication Date: 2026-05-29JIANGSU HIGHSTAR BATTERY MFG CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU HIGHSTAR BATTERY MFG CO LTD
Filing Date
2024-11-19
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing lithium-ion batteries exhibit significant capacity degradation at low temperatures, resulting in poor battery performance and making it difficult to meet the application requirements of certain fields.

Method used

By controlling the single-sided density, compaction thickness, and compaction density of the positive and negative electrode sheets within a specific range, and combining lithium iron phosphate and graphite active materials with specific particle sizes, a complete SEI film is formed using a two-stage formation process, thereby improving the battery's discharge performance and cycle performance at low temperatures.

Benefits of technology

It achieves high discharge performance and high cycle performance of lithium-ion batteries in a temperature range of -20℃ to 55℃, and reduces the performance degradation of lithium-ion batteries at low temperatures.

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Abstract

This invention relates to the field of lithium-ion battery technology, and discloses a battery cell, its preparation method, and its application. The battery cell includes an electrode assembly and an electrolyte, wherein the electrode assembly includes a positive electrode, a negative electrode, and a separator; wherein the one-sided density of the positive electrode is 172-178 g / m³. 2 The compacted thickness is 149-155 μm, and the compacted density is 2.45-2.85 g / cm³. 3 The single-sided density of the negative electrode is 84.1-87.4 g / m³. 2 The compacted thickness is 117-123 μm, and the compacted density is 1.35-1.95 g / cm³. 3 This invention achieves high discharge performance and high cycle performance of battery cells at low temperatures by controlling the compaction density of the positive and negative electrode sheets, the separator, and the electrolyte formulation within specific ranges.
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