CN-118232451-B - Energy storage system and power station

CN118232451BCN 118232451 BCN118232451 BCN 118232451BCN-118232451-B

Abstract

The invention discloses an energy storage system and a power station, wherein the energy storage system comprises: at least two battery modules, an interface assembly, and a battery management system. Each battery module is provided with a battery information collector for collecting single parameters of the battery module, an interface component is used for connecting at least two battery modules on and off so that the number of the battery modules connected into the energy storage system can be changed, any battery module actively sends out the single parameters once connected into the energy storage system, a controller in the battery management system is connected with the battery information collectors and is used for receiving each single parameter, calculating the integral parameters of the energy storage system according to the single parameters, judging whether the number of the battery modules is changed according to the integral parameters and adjusting the control parameters of the battery management system according to the integral parameters when the number of the battery modules is changed. The control logic is simplified and complex, and the battery management system can accurately control the state of the whole energy storage system.

Inventors

DING GENGXIN
SHI QIAN
ZUO SHIWEI
WEI YUN
WU CHAO

Assignees

比亚迪股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230926

Claims (12)

1. An energy storage system, comprising: each battery module is provided with a battery information collector, and the battery information collectors are used for collecting monomer parameters of the battery modules; The interface component is used for connecting at least two battery modules on-off so as to enable the number of the battery modules connected into the energy storage system to be variable, and the battery modules actively send out the monomer parameters of the battery modules once being connected into the energy storage system; The battery management system comprises a controller, wherein the controller is connected with the interface component; The controller is used for receiving each single parameter, calculating the overall parameter of the energy storage system according to the single parameter, judging whether the number of the battery modules is changed according to the overall parameter, and adjusting the control parameter of the battery management system according to the overall parameter when the number of the battery modules is changed; each interface component comprises a first interface and a second interface, wherein the first interface and the second interface are connected with the controller; the first interface is used for connecting a battery in the battery module, and the second interface is used for connecting the battery information collector in the battery module; the battery information collector generates the collected monomer parameters to the controller through the second interface; at least two battery information collectors are connected in series through the corresponding second interfaces; The controller comprises a first control interface and a second control interface, one end of the battery information collector connected in series is connected with the first control interface, the other end of the battery information collector is connected with the second control interface, and a double-loop daisy chain communication mode is adopted among the battery information collectors.
2. The energy storage system of claim 1, wherein the battery management system further comprises a dc-to-dc converter; The direct current-to-direct current converter is used for converting direct current output by the energy storage system from a first voltage to a second voltage and then supplying power to the controller, wherein the first voltage is larger than the second voltage.
3. The energy storage system of claim 2, wherein the battery management system further comprises a trip connected between the battery module and the dc-dc converter; When the release is closed, the battery module supplies power to the controller through the direct current-to-direct current converter; and the controller is also connected with the release, and is also used for controlling the release to be switched from a closed state to an open state according to the control parameters.
4. The energy storage system of claim 3, further comprising an inverter; The battery management system also comprises a pre-charging resistor and a pre-charging contactor which are connected in series, wherein the pre-charging resistor is connected with the release, and the pre-charging contactor is connected with the inverter; The controller is also connected with the pre-charging contactor and is further used for controlling the pre-charging contactor to be closed when the overall voltage in the overall parameter is smaller than a preset threshold value and controlling the pre-charging contactor to be opened when the overall voltage in the overall parameter is not smaller than the preset threshold value.
5. The energy storage system of claim 4, wherein the battery management system further comprises a primary positive contactor and a primary negative contactor; the main positive contactor is connected between the release and the inverter, and is connected in parallel with the pre-charging resistor and the pre-charging contactor; the main negative contactor is connected with the negative electrode output end of the battery module, and the inverter is also connected with the negative electrode output end of the battery module through the main negative contactor; the controller is connected with the main positive contactor and the main negative contactor, and is further used for controlling the pre-charging contactor and the main negative contactor to be closed and controlling the main positive contactor to be closed when the overall voltage in the overall parameter is not smaller than the preset threshold value.
6. The energy storage system of claim 5, wherein said controller is further configured to determine whether a first fault type has occurred in said energy storage system based on said overall parameter and to control said primary positive contactor and said primary negative contactor to open when said first fault type has occurred in said energy storage system.
7. The energy storage system of claim 6, wherein said controller is further configured to determine whether a second fault type has occurred in said energy storage system based on said overall parameter and to control said trip unit to open when said second fault type has occurred in said energy storage system.
8. The energy storage system of claim 5, wherein a shunt meter is disposed on the controller, the shunt meter is connected between the dc-dc converter and the controller, and the shunt meter is further connected between the negative pole of the battery module and the main negative contactor to detect current information output by the dc-dc converter.
9. The energy storage system of claim 4, wherein said battery management system further comprises a communication module communicatively coupled to both said controller and said inverter; The communication module is used for transmitting one or more of the monomer parameter, the integral parameter and the control parameter to the outside, and is also used for receiving an outside control instruction and transmitting the control instruction to the controller.
10. The energy storage system of any one of claims 1-9, wherein the cell parameter comprises a capacity, voltage, current, state of charge, or temperature of each battery module, and the overall parameter comprises an overall capacity, an overall voltage, an overall current, an overall state of charge, or an overall temperature of the energy storage system.
11. The energy storage system according to any one of claims 1 to 9, wherein the single parameter includes a voltage parameter of each battery module, and the overall parameter includes an expected total voltage parameter of the energy storage system calculated according to the voltage parameter collected by each battery information collector; The controller is also used for detecting the actual total voltage parameter of the energy storage system and comparing the expected total voltage parameter with the actual total voltage parameter so as to judge whether the battery module fails.
12. A power plant comprising an energy storage system according to any one of claims 1 to 11.

Description

Energy storage system and power station Technical Field The present application relates to the field of batteries, and more particularly to an energy storage system and a power station. Background Energy storage systems have evolved with the changing international situation, as well as the national dependence on energy and the need for energy storage. For areas with relatively deficient petroleum and coal energy sources, the natural light source can be used as an alternative for energy source supplement if the natural light source has congenital light advantage. At present, household energy storage is an important energy supply and storage mode, and has important significance for reducing the electricity use cost of users. Household energy storage systems are increasingly becoming a follow-up important link in energy production. The development of the household energy storage system has positive significance for relieving the shortage of energy and reducing the use cost. In a household energy storage system, there are often situations where it is necessary to change the number of battery modules. However, the related art cannot integrate parameter information of different battery modules, resulting in complicated and inaccurate control logic. Disclosure of Invention The present application has been made in order to solve at least one of the above problems. According to a first aspect of the present application, there is provided an energy storage system comprising at least two battery modules, an interface assembly and a battery management system. Each battery module is internally provided with a battery information collector, and the battery information collectors are used for collecting monomer parameters of the battery modules; the interface component is used for connecting at least two battery modules on and off so that the number of the battery modules connected into the energy storage system is variable, the battery management system actively sends out the single parameter of the battery modules once the battery modules are connected into the energy storage system, the battery management system comprises a controller, the controller is connected with the battery information collector, the controller is used for receiving each single parameter, calculating the integral parameter of the energy storage system according to the single parameter, judging whether the number of the battery modules is changed according to the integral parameter, and adjusting the control parameter of the battery management system according to the integral parameter when the number of the battery modules is changed. In one embodiment of the application, each interface assembly comprises a first interface and a second interface, wherein the first interface and the second interface are connected with the controller, the first interface is used for connecting batteries in the battery modules, and the second interface is used for connecting the battery information collectors in the battery modules. In one embodiment of the present application, the battery information collector generates the collected parameters of the single body to the controller through the second interface. In one embodiment of the application, at least two battery information collectors are connected in series through the corresponding second interfaces, the controller comprises a first control interface and a second control interface, and one end of each battery information collector connected in series is connected with the first control interface, and the other end of each battery information collector is connected with the second control interface. In one embodiment of the application, the battery management system further comprises a direct current-to-direct current converter, wherein the direct current-to-direct current converter is used for converting direct current output by the energy storage system from a first voltage to a second voltage and then supplying power to the controller, and the first voltage is larger than the second voltage. In one embodiment of the application, the battery management system further comprises a release connected between the battery module and the direct current-to-direct current converter, wherein when the release is closed, the battery module supplies power to the controller through the direct current-to-direct current converter, and the controller is further connected with the release and is further used for controlling the release to be switched from a closed state to an open state according to the control parameters. In one embodiment of the application, the energy storage system further comprises an inverter, the battery management system further comprises a pre-charging resistor and a pre-charging contactor which are connected in series, wherein the pre-charging resistor is connected with the release, the pre-charging contactor is connected with the inverter, the controller is further connected with the pre-charging