Battery control method, controller, battery pack and electric equipment

CN122051491APending Publication Date: 2026-05-15BYD CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BYD CO LTD
Filing Date
2026-03-31
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

When lithium-ion batteries are fast charged in low-temperature environments, there are risks of lithium plating and low heating efficiency. Current technologies with fixed-rate heating current cannot effectively balance these two issues.

Method used

By controlling the content of the positive electrode conductive agent and the thickness of the carbon coating layer of the positive electrode particles, and adjusting the rate of heating current, a balance between self-heating efficiency and lithium plating risk can be achieved. Appropriate heating current waveforms and frequencies are used for battery heating.

Benefits of technology

While improving self-heating efficiency, it reduces the risk of lithium plating, improves battery capacity retention, shortens charging time, and extends battery life.

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Abstract

The embodiment of the invention provides a battery control method, a controller, a battery pack and electric equipment. The method comprises the steps that when the temperature of a battery is lower than a first temperature, the battery is controlled to be heated automatically, and the heating current of the self-heating meets the following conditions; wherein the content of the positive electrode conductive agent of the battery is recorded as follows; the thickness of the carbon-coated layer of the positive electrode particle of the battery is recorded as L, the unit is nm, and the multiplying power of the heating current is recorded as C. On the basis of improving the heating efficiency of self-heating, the lithium precipitation risk is reduced, the retention rate of the battery capacity is improved, the fast charging time is shortened, and the service life of the battery is prolonged.
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