均衡电路和均衡系统

Abstract

本申请实施例提供了一种均衡电路和均衡系统，能够有效降低多个电池单体之间的均衡成本。该均衡电路和采样芯片连接，采样芯片用于对多个电池单体的电池参数进行采样，该均衡电路包括：升压电路，升压电路的第一输入端用于接收多个电池单体中目标电池单体的电压，并将目标电池单体的电压抬升至目标电压；驱动电路，驱动电路的输入端与升压电路的输出端连接，输出端与开关阵列中的目标开关连接，驱动电路用于基于目标电压输出第一驱动信号，第一驱动信号用于通过采样芯片的一个均衡端口驱动目标开关导通，以对多个电池单体中的待均衡电池单体进行均衡，目标开关对应于待均衡电池单体。

Claims

1. An equalization circuit, characterized by, The equalization circuit is connected to a sampling chip, which is used to sample the battery parameters of multiple battery cells. A boost circuit, wherein the first input terminal of the boost circuit is used to receive the voltage of the target battery cell among the plurality of battery cells and boost the voltage of the target battery cell to the target voltage; A driving circuit is provided, wherein the input terminal of the driving circuit is connected to the output terminal of the boost circuit, and the output terminal of the driving circuit is connected to the target switch in the switch array. The driving circuit is used to output a first driving signal based on the target voltage. The first driving signal is used to drive the target switch to conduct through an equalization port of the sampling chip, so as to equalize the battery cells to be equalized among the plurality of battery cells. The target switch corresponds to the battery cell to be equalized.

2. The equalization circuit of claim 1, wherein, The sampling chip includes multiple equalization ports. During the equalization process of the battery cell to be equalized, only the first equalization port among the multiple equalization ports is in the open state. The first equalization port is interconnected with the target switch. The first drive signal is used to drive the target switch to conduct through the first equalization port.

3. The equalization circuit of claim 1 or 2, characterized in that, The second input terminal of the boost circuit is used to receive the second drive signal, and the boost circuit is used to output the target voltage based on the voltage of the target battery and the second drive signal; The boost circuit includes at least one boost circuit, which includes a plurality of first diodes, a first capacitor, and a second capacitor. The plurality of first diodes are connected in series. The first capacitor and the second capacitor are respectively connected to the first terminals of different first diodes among the plurality of first diodes. The other terminal of the first capacitor is connected to the second input terminal, and the other terminal of the second capacitor is grounded.

4. The equalization circuit of claim 3, wherein, The battery cell to be balanced is the same as the target battery cell, wherein the second driving signal includes the voltage signal inside the sampling chip.

5. The equalization circuit of claim 3, wherein, The target battery cell is the battery cell with the highest voltage among the plurality of battery cells, wherein the second driving signal includes the voltage signal output by the sampling chip.

6. The equalization circuit of claim 1 or 2, wherein, The first driving signal includes a current signal with a constant current.

7. The equalization circuit according to claim 6, characterized in that, The driving circuit includes multiple second diodes, a first resistor, a second resistor, a first transistor, and a second transistor connected in series. The first end of the multiple second diodes and one end of the second resistor are connected to the output terminal of the boost circuit. The other end of the second resistor is connected to the emitter of the first transistor. The collector of the first transistor is connected to the target switch. The base of the first transistor is connected to the second end of the second diode and one end of the first resistor. The other end of the first resistor is connected to the collector of the second transistor. The base of the second transistor is used to receive a third driving signal. The collector of the second transistor is grounded. The driving circuit is used to output the current signal based on the target voltage and the third driving signal.

8. The equalization circuit of claim 7, wherein, The driving circuit also includes a third resistor, one end of which is connected to the base of the second transistor, and the other end of which is grounded.

9. The equalization circuit of claim 7, wherein, The driving circuit further includes a fourth resistor, one end of which is connected to the base of the second transistor, and the other end of which is used to receive the third driving signal.

10. The equalization circuit of claim 7, wherein, The battery cell to be balanced is the same as the target battery cell, wherein the third driving signal includes the voltage signal inside the sampling chip.

11. The equalization circuit of claim 7, wherein, The target battery cell is the battery cell with the highest voltage among the plurality of battery cells. The third driving signal includes the signal output by the first equalization port, which is the equalization port corresponding to the battery cell to be equalized among the plurality of equalization ports of the sampling chip.

12. The equalization circuit of claim 1 or 2, wherein, When the voltage of the battery cell to be balanced is greater than the first voltage threshold, the battery cell to be balanced outputs energy to the energy pool. When the voltage of the battery cell to be balanced is less than the second voltage threshold, the energy pool outputs energy to the battery cell to be balanced.

13. An equalization system, characterized by, include: Multiple battery cells; A switch array, comprising multiple switches, wherein different battery cells correspond to different switches; A sampling chip is used to sample the battery parameters of the multiple battery cells; According to any one of claims 1 to 12, the equalization circuit is connected to the sampling chip, and the equalization system controls the equalization circuit through the sampling chip to equalize the battery cells to be equalized among the plurality of battery cells.

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