Energy balancing method and apparatus

• US 10,361,568 B2
• Filed: 12/29/2017
• Issued: 07/23/2019
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Yang, Rui, Liu, Xiaokang, Wu, Zhiwei
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): Piggush, Aaron
• Application Number:
  US15/858,210
• Publication Number:
  US 20180123356A1
• Time in Patent Office: 571 Days
• Field of Search: 320108, 320116, 320119, 320158, 320164
• CPC Class Codes: B60L 58/22 Balancing the charge of battery modules
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H02J 2207/10 Control circuit supply, e.g. means for supplying power to the control circuit
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0019 using switched or multiplexed charge circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An energy balancing apparatus and method, and a terminal are provided in the battery field. The apparatus may include a controlled alternating current energy supply, an alternating current energy distribution circuit, filter circuits, rectifier circuits, and a balance control circuit. The controlled alternating current energy supply and an input port of the alternating current energy distribution circuit are connected in parallel, each output port of the alternating current energy distribution circuit and an input side of a corresponding filter circuit are connected in parallel, an output side of each filter circuit and an alternating current side of a corresponding rectifier circuit are connected in parallel, a direct current side of each rectifier circuit and a corresponding battery cell are connected in parallel, each battery cell is connected to the balance control circuit, and the balance control circuit is connected to the controlled alternating current energy supply.

Claims

1. An energy balancing apparatus, comprising:

a controlled alternating current energy supply, an alternating current energy distribution circuit, filter circuits, rectifier circuits, and a balance control circuit,

wherein the alternating current energy distribution circuit comprises N output ports and at least one input port, N is an integer not less than 2, a quantity of the filter circuits is N, frequency intervals corresponding to any two filter circuits do not overlap, a quantity of the rectifier circuits is N, the output ports correspond one-to-one to the filter circuits, the filter circuits correspond one-to-one to the rectifier circuits, and the rectifier circuits correspond one-to-one to battery cells, a quantity of the battery cells is N; and

wherein the controlled alternating current energy supply and the input port of the alternating current energy distribution circuit are connected in parallel, the controlled alternating current energy supply is connected to the balance control circuit, and the controlled alternating current energy supply is configured to output, according to a frequency instruction signal sent by the balance control circuit, an alternating current voltage corresponding to the frequency instruction signal;

wherein each output port of the alternating current energy distribution circuit and an input side of a corresponding filter circuit are connected in parallel, and the alternating current energy distribution circuit is configured to distribute, to each output port, alternating current energy transferred from the controlled alternating current energy supply;

wherein an output side of at least one filter circuit of the N filter circuits and an alternating current side of a corresponding rectifier circuit are connected in parallel, and at least one filter circuit is configured to allow alternating current energy whose frequency is in a preset frequency interval to pass; and

wherein two ends of a direct current side of each rectifier circuit of the N rectifier circuits and two ends of a corresponding battery cell are connected in parallel, and the rectifier circuit is configured to convert, into direct current energy, the alternating current energy transferred from the filter circuit, and transfer the direct current energy to the battery cell.

2. The apparatus according to claim 1, wherein each battery cell is connected to the balance control circuit, the balance control circuit is configured to acquire a status parameter of each battery cell, determine, according to a status parameter of each battery cell, a battery cell that requires an energy supplement, determine a frequency interval of a filter circuit corresponding to the battery cell that requires an energy supplement, and send a frequency instruction signal to the controlled alternating current energy supply, so that the controlled alternating current energy supply outputs an alternating current voltage whose frequency is in the frequency interval.

3. The apparatus according to claim 1, wherein the controlled alternating current energy supply comprises an inverter structure and an inverter control structure, and the inverter control structure is configured to receive the frequency instruction signal sent by the balance control circuit, and instruct the inverter structure to output an alternating current voltage whose frequency is corresponding to the frequency instruction signal.

4. The apparatus according to claim 1, wherein the N output ports of the alternating current energy distribution circuit are electrically isolated from each other.

5. The apparatus according to claim 1, wherein the alternating current energy distribution circuit comprises a multi-winding transformer.

6. The apparatus according to claim 1, wherein the alternating current energy distribution circuit comprises multiple double-winding transformers whose primary sides are connected in parallel and whose secondary sides are isolated from each other.

7. The apparatus according to claim 1, wherein the alternating current energy distribution circuit is multiple coils.

8. The apparatus according to claim 1, wherein the filter circuit comprises an active filter circuit.

9. The apparatus according to claim 1, wherein the filter circuit comprises a passive filter circuit.

10. The apparatus according to claim 1, wherein the filter circuit comprises at least one inductor circuit and at least one capacitor circuit, wherein the inductor circuit and the capacitor circuit are connected in series or in parallel.

11. The apparatus according to claim 1, wherein the filter circuit comprises at least one inductor circuit, at least one capacitor circuit, and at least one resistor circuit, wherein the inductor circuit, the capacitor circuit, and the resistor circuit are connected in series or in parallel.

12. The apparatus according to claim 1, wherein the rectifier circuit comprises a full-bridge rectifier structure.

13. The apparatus according to claim 1, wherein the rectifier circuit comprises a full-wave rectifier structure.

14. A terminal comprising:

battery cells; and

a controlled alternating current energy supply, an alternating current energy distribution circuit, filter circuits, rectifier circuits, and a balance control circuit,

wherein the alternating current energy distribution circuit comprises N output ports and at least one input port, N is an integer not less than 2, a quantity of the filter circuits is N, frequency intervals corresponding to any two filter circuits do not overlap, a quantity of the rectifier circuits is N, the output ports correspond one-to-one to the filter circuits, the filter circuits correspond one-to-one to the rectifier circuits, and the rectifier circuits correspond one-to-one to the battery cells, a quantity of the battery cells is N; and

wherein the controlled alternating current energy supply and the input port of the alternating current energy distribution circuit are connected in parallel, the controlled alternating current energy supply is connected to the balance control circuit, and the controlled alternating current energy supply is configured to output, according to a frequency instruction signal sent by the balance control circuit, an alternating current voltage corresponding to the frequency instruction signal;

wherein each output port of the alternating current energy distribution circuit and an input side of a corresponding filter circuit are connected in parallel, and the alternating current energy distribution circuit is configured to distribute, to each output port, alternating current energy transferred from the controlled alternating current energy supply;

wherein an output side of at least one filter circuit of the N filter circuits and an alternating current side of a corresponding rectifier circuit are connected in parallel, and at least one filter circuit is configured to allow alternating current energy whose frequency is in a preset frequency interval to pass; and

wherein two ends of a direct current side of each rectifier circuit of the N rectifier circuits and two ends of a corresponding battery cell are connected in parallel, and the rectifier circuit is configured to convert, into direct current energy, the alternating current energy transferred from the filter circuit, and transfer the direct current energy to the battery cell.