Battery charging circuit and electric vehicle
By incorporating a switching transistor combination circuit and a heating control contactor into the battery, self-heating of the battery is achieved, solving the problem of low charging efficiency of lithium-ion batteries at low temperatures, improving charging speed, and reducing costs.
CN119519017BActive Publication Date: 2026-06-09BYD CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BYD CO LTD
- Filing Date
- 2023-08-25
- Publication Date
- 2026-06-09
AI Technical Summary
Technical Problem
In low-temperature environments, lithium-ion batteries have low charging efficiency, and existing external heating methods are inefficient and costly.
Method used
By incorporating a switching transistor combination circuit and a heating control contactor into the battery, self-heating is achieved by utilizing the internal resistance of the battery to generate heat, and the charging and discharging of the cells are alternately controlled.
Benefits of technology
It improves the charging speed of batteries at low temperatures, reduces energy loss, lowers costs, and eliminates the need for additional heating devices.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN119519017B_ABST
Abstract
The application discloses a charging circuit of a battery and an electric vehicle. The charging circuit comprises a battery, a direct-current charging interface, a switch tube combination circuit and a heating control contactor. The battery comprises a first part of battery cells and a second part of battery cells connected in series through a series connection node. The switch tube combination circuit is connected between the direct-current charging interface and the battery. The heating control contactor is connected between the switch tube combination circuit and the series connection node. When the heating control contactor is turned on and the switch tube combination circuit is configured as a boost circuit, the switch tube combination circuit is used for boosting direct-current power input from the direct-current charging interface to charge the battery, and alternately controls the first part of battery cells to discharge to charge the second part of battery cells or the second part of battery cells to discharge to charge the first part of battery cells. The self-heating of the battery is realized by utilizing the internal resistance heating of the battery.
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