CN-122001045-A - Battery equalization topology circuit, battery equalization method and battery management system

CN122001045ACN 122001045 ACN122001045 ACN 122001045ACN-122001045-A

Abstract

The embodiment of the application provides a battery balancing topological circuit, a battery balancing method and a battery management system. The circuit comprises at least two battery strings, a first balancing topological circuit and a second balancing topological circuit, wherein each battery string comprises at least two batteries, each battery string is connected through the second balancing topological circuit, each battery in each battery string is connected through the first balancing topological circuit, the first balancing topological circuit is used for adjusting the first battery voltage of each battery until the first battery voltage is in a first preset voltage range, and the second balancing topological circuit is used for adjusting the second battery voltage of each battery string until the second battery voltage is in a second preset voltage range. The battery balancing topological circuit can realize rapid balancing of battery voltages among batteries and among battery strings.

Inventors

YE XIAOXIN
YU JIAMENG
HUANG YAN
GUO WEIFENG
ZENG XIAOZHONG
WU HAOYAN
XIE YU
CHEN ZHENGLONG
GONG YANPING
SU WEIXIONG
XIANG YUJIE

Assignees

广东电网有限责任公司惠州供电局
广东电网有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260107

Claims (10)

1. The battery balancing topological circuit is characterized by comprising at least two battery strings, a first balancing topological circuit and a second balancing topological circuit, wherein each battery string comprises at least two batteries, each battery string is connected through the second balancing topological circuit, and each battery in each battery string is connected through the first balancing topological circuit; The first balancing topology circuit is used for adjusting first battery voltages of the batteries until the first battery voltages are in a first preset voltage range; The second balancing topology circuit is used for adjusting second battery voltages of the battery strings until the second battery voltages are in a second preset voltage range.
2. The circuit of claim 1, wherein the first equalization topology comprises a first switching tube, a second switching tube, a first inductance, a second inductance, and a first capacitance; The source electrode of the first switch tube is connected with the drain electrode of the second switch tube, the negative electrode of the first battery and the positive electrode of the second battery, the drain electrode of the first switch tube is connected with one end of the first inductor and one end of the first capacitor, the other end of the first inductor is connected with the positive electrode of the first battery, the other end of the first inductor is connected with the source electrode of the second switch tube and one end of the second inductor, and the other end of the second inductor is connected with the negative electrode of the second battery.
3. The circuit according to claim 2, characterized in that said first equalization topology is in particular configured to: And controlling the first switching tube to be turned on or off and controlling the second switching tube to be turned on or off so as to adjust the battery voltage of the first battery and the battery voltage of the second battery.
4. A circuit according to claim 3, wherein in the event that the first equalization topology switches from a first mode to a second mode, the battery voltage of the first battery increases and the battery voltage of the second battery decreases; When the first equalization topology circuit is switched from the second mode to the first mode, the battery voltage of the first battery is reduced, and the battery voltage of the second battery is increased; The first mode is that the first switching tube is conducted and the second switching tube is closed, and the second mode is that the first switching tube is closed and the body diode of the second switching tube is conducted.
5. The circuit of claim 1, wherein the second equalization topology comprises a transformer, a third inductor, a fourth inductor, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, a ninth switching tube, and a tenth switching tube; The positive electrode of the first battery string is connected with the drain electrode of the third switching tube and the drain electrode of the fourth switching tube, and the negative electrode of the first battery string is connected with the positive electrode of the second battery string, the source electrode of the fifth switching tube, the source electrode of the sixth switching tube, the drain electrode of the seventh switching tube and the drain electrode of the eighth switching tube; the positive electrode of the second battery string is connected with the source electrode of the fifth switching tube, the source electrode of the sixth switching tube, the drain electrode of the seventh switching tube and the drain electrode of the eighth switching tube, and the negative electrode of the second battery string is connected with the source electrode of the ninth switching tube and the source electrode of the tenth switching tube; the first input end of the transformer is connected with the source electrode of the third switching tube, the first output end of the transformer is connected with one end of the third inductor, and the other end of the third inductor is connected with the source electrode of the fourth switching tube and the drain electrode of the sixth switching tube; The second input end of the transformer is connected with the source electrode of the fifth switching tube and the drain electrode of the ninth switching tube, the second output end of the transformer is connected with one end of the fourth inductor, and the other end of the fourth inductor is connected with the source electrode of the eighth switching tube and the drain electrode of the tenth switching tube.
6. The circuit according to claim 5, wherein the second equalization topology is specifically configured to receive a modulation signal, and control a current flow direction and/or a current magnitude of the first battery string according to the modulation signal, and control a current flow direction and/or a current magnitude of the second battery string according to the modulation signal.
7. A battery equalization method applied to the battery equalization topology of any of claims 1-6, the method comprising: Acquiring a first battery voltage of each battery and a second battery voltage of each battery string; Determining a target battery from the batteries according to a first preset voltage range and the first battery voltage; determining a target battery string from the battery strings according to a second preset voltage range and the second battery voltage; charging or discharging the target battery until the battery voltage of the target battery is within the first preset voltage range; And charging or discharging the target battery string until the battery voltage of the target battery string is within the second preset voltage range.
8. The method of claim 7, wherein said determining a target battery from said respective batteries based on a first preset voltage range and said first battery voltage comprises: Determining that the battery is a target battery to be charged under the condition that the first battery voltage is smaller than the lower limit value of the first preset voltage range; And under the condition that the first battery voltage is larger than the upper limit value of the first preset voltage range, determining that the battery is a target battery to be discharged.
9. The method of claim 7, wherein the determining a target battery string from the respective battery strings based on a second preset voltage range and the second battery voltage comprises: Determining the battery string as a target battery string to be charged under the condition that the second battery voltage is smaller than the lower limit value of the second preset voltage range; and determining the battery string as a target battery string to be discharged under the condition that the second battery voltage is larger than the second preset voltage range upper limit value.
10. A battery management system comprising a battery equalization topology as claimed in any one of the preceding claims 1-6.

Description

Battery equalization topology circuit, battery equalization method and battery management system Technical Field The present application relates to the field of electrical technologies, and in particular, to a battery balancing topology circuit, a battery balancing method, and a battery management system. Background The purpose of battery equalization is to keep the cell voltage or the voltage deviation of the battery pack within an expected range, so that each cell is ensured to keep the same state during normal use, and overcharge and overdischarge are avoided. In the existing battery equalization circuit, equalization between two batteries with far intervals can be realized only through a large number of switches, and the battery equalization circuit is mainly suitable for equalization between short battery strings. However, in the existing battery equalization circuit, a large number of switches are needed to realize equalization between two batteries with far intervals, and the energy path is too long, so that the equalization time is too long, the equalization speed is slow, and the final equalization effect is poor. Disclosure of Invention The embodiment of the application provides a battery balancing topological circuit, a battery balancing method and a battery management system, which are used for shortening the balancing time of battery voltages among batteries and among battery strings and improving the balancing speed. In a first aspect, an embodiment of the present application provides a battery equalization topology circuit, including at least two battery strings, a first equalization topology circuit and a second equalization topology circuit, where the battery strings include at least two batteries, each battery string is connected through the second equalization topology circuit, and each battery in the battery strings is connected through the first equalization topology circuit; The first balancing topology circuit is used for adjusting first battery voltages of the batteries until the first battery voltages are in a first preset voltage range; The second balancing topology circuit is used for adjusting second battery voltages of the battery strings until the second battery voltages are in a second preset voltage range. In a second aspect, an embodiment of the present application provides a battery equalization method, including: a first battery voltage of each battery and a second battery voltage of each battery string are obtained. Determining a target battery from the batteries according to a first preset voltage range and the first battery voltage; determining a target battery string from the battery strings according to a second preset voltage range and the second battery voltage; charging or discharging the target battery until the battery voltage of the target battery is within the first preset voltage range; And charging or discharging the target battery string until the battery voltage of the target battery string is within the second preset voltage range. In a third aspect, an embodiment of the present application provides a battery management system, including the above battery equalization topology circuit. According to the battery balancing topological circuit, the battery balancing method and the battery management system provided by the embodiment of the application, the balancing among the batteries is realized by controlling the first balancing topological circuit, and the balancing among the battery strings is realized by controlling the second balancing topological circuit, so that the imbalance of the voltages among the monomers in the operation process of the lithium battery is solved, and the balancing speed of the battery voltage is improved. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. FIG. 1 is a schematic diagram of a prior art battery equalization topology; fig. 2 is a schematic diagram of a battery equalization topology circuit provided by the application; Fig. 3 is a schematic diagram of a battery equalization topology according to another embodiment of the present application; fig. 4 is a schematic diagram of a Cuk circuit structure according to an embodiment of the present application; fig. 5 is a diagram of a transformer switching circuit based on a phase shift full bridge according to an embodiment of the present application; FIG. 6 is a schematic diagram of power conversion according to an embodiment of the present application; Fig. 7 is a flowchart of a battery equalization control method according to an embodiment of the present application; FIG. 8 is a schematic diagram of a circuit control strategy execution flow provided in an embodiment of the present application; Fig. 9 is a schematic diagram of a battery equalization flow provided in another embodi