Multi-parallel battery system management circuit and management method

Abstract

The application provides a management circuit and a management method of a multi-parallel battery system, the management circuit comprising a communication circuit and a wake-up circuit, wherein the energy storage converter exchanges information with the multi-parallel battery system through the communication circuit; the battery systems exchange information with each other through the wake-up circuit; when the energy storage converter can charge the under-voltage battery system, the online battery system which is not under voltage receives a charging instruction, and then wakes up the under-voltage battery system through the wake-up circuit. The application can fully utilize the charging opportunity of the battery system, maximally prolong the standby time of the under-voltage battery system, reduce the probability of manual intervention, and improve the reliability and stability of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics, in particular to a multi-parallel battery system management circuit and a management method. BACKGROUND

[0002] In current household energy storage, backup base station and other industry applications, there are multiple battery systems in parallel. When the voltage of a certain battery is too low, the battery system will exit parallel connection, "offline", and enter low-power mode, i.e. hibernation mode. The existing industry practice is that when it can be charged, the PCS issues a charging instruction, and the "offline" battery system wakes up regularly. If the charging instruction is received, the charging will start. Otherwise, it will continue to enter low-power mode.

[0003] Under the existing practice, if the "offline" hibernation system with low voltage wants to be charged in time, it must frequently wake up to detect whether it can be charged, which will increase the power consumption of the system, causing the already low-voltage battery to further consume too much power, and ultimately possibly leading to the battery being unable to wake up by itself (insufficient power supply) and requiring manual intervention. If the time interval for waking up the system is extended to reduce power consumption, it may result in the system not being awake when it can be charged, or the charging opportunity being missed when the system is awake, greatly reducing the opportunity for the "offline" hibernation system with low voltage to be charged. SUMMARY

[0004] The purpose of the present application is to provide a multi-parallel battery system management circuit and management method that can fully utilize the charging opportunity of the battery and maximize the standby time of the low-voltage battery, to solve the problem of high manual intervention probability and few charging opportunities in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a management circuit for a multi-parallel battery system, comprising a communication circuit and a wake-up circuit. The energy storage converter interacts with the multi-parallel battery system through the communication circuit, and the battery systems interact with each other through the wake-up circuit.

[0006] When the energy storage converter can charge the low-voltage battery system, the online battery system that is not low-voltage receives the charging instruction and wakes up the low-voltage battery system through the wake-up circuit.

[0007] Optionally, when a certain battery system is low-voltage, the charging switch corresponding to the battery system is turned off, the battery system enters an offline hibernation state, and the communication between the battery system and the energy storage converter is interrupted.

[0008] Optionally, after the low-voltage battery system is woken up, the host in the multi-parallel battery system sends a command to control the charging switch corresponding to the low-voltage battery system to be turned on, and the energy storage converter charges the low-voltage battery system.

[0009] The application also provides a management method of the multi-parallel battery system, the energy storage converter and the multi-parallel battery system exchange information through the communication circuit, and the battery systems exchange information through the wake-up circuit.

[0010] When the energy storage converter can charge the under-voltage battery system, the online battery system which is not under voltage receives the charging instruction and wakes up the under-voltage battery system through the wake-up circuit.

[0011] Optionally, when a certain battery system is under voltage, the charging switch corresponding to the battery system is turned off, the battery system enters the offline hibernation state, and the communication between the battery system and the energy storage converter is interrupted.

[0012] Optionally, when the under-voltage battery system is woken up, the host in the multi-parallel battery system sends an instruction to control the charging switch corresponding to the under-voltage battery system to be turned on, and the energy storage converter charges the under-voltage battery system.

[0013] Compared with the prior art, the application has the following advantages: the energy storage converter and the multi-parallel battery system exchange information through the communication circuit, the battery systems exchange information through the wake-up circuit, and when the energy storage converter can charge the under-voltage battery system, the online battery system which is not under voltage receives the charging instruction and wakes up the under-voltage battery system through the wake-up circuit. The application can fully utilize the charging opportunity of the battery, maximize the standby time of the under-voltage battery, reduce the probability of manual intervention, and improve the reliability and stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The management circuit schematic diagram of the multi-parallel battery system of the application; DETAILED DESCRIPTION

[0015] The preferred embodiments of the application are described in detail below with reference to the accompanying drawings, but the application is not limited to these embodiments only. The application covers any alternatives, modifications, equivalent methods and solutions within the spirit and scope of the application.

[0016] In order for the public to have a thorough understanding of the application, specific details are described in the following preferred embodiments of the application, and the application can also be fully understood without these details by those skilled in the art.

[0017] The application is described in more detail below with reference to the accompanying drawings in the following paragraphs. It should be noted that the drawings are in a simplified form and use non-precise proportions for the purpose of facilitating and clearly assisting in the description of the embodiments of the application.

[0018] As Figure 1As shown, the schematic diagram of the management circuit of the multi-parallel battery system is shown, including a communication circuit and a wake-up circuit, the energy storage converter PCS exchanges information with the multi-parallel battery system through the communication circuit; the battery systems exchange information with each other through the wake-up circuit. The energy storage converter PCS exchanges information with the battery system through the communication circuit RS485 / CAN, and the battery systems exchange information with each other through the wake-up circuit RS485 / CAN. When a certain battery system is under-voltage, the corresponding switch will be disconnected, and the offline sleep state will be entered, at this time the communication between the energy storage converter PCS and the battery system will be interrupted.

[0019] When the PCS can charge the battery system, the charging instruction is sent through the communication circuit RS485 / CAN, and the online battery system receives the charging instruction, and the "offline" battery system is awakened through the wake-up circuit RS485 / CAN. When the under-voltage battery system is awakened, the host in the multi-parallel battery system sends a control instruction to control the under-voltage battery system to turn on the corresponding charging switch, and the energy storage converter PCS immediately charges the under-voltage battery system.

[0020] Although the above embodiments are described and explained separately, the technologies involved in part are common, and those skilled in the art can replace and integrate between embodiments, and the contents not explicitly recorded in one embodiment can be referred to another embodiment.

[0021] The above-described embodiments do not constitute a limitation on the protection scope of the technical solutions. Any modifications, equivalent replacements and improvements made within the spirit and principles of the above-described embodiments shall be included in the protection scope of the technical solutions.

Claims

1. A management circuit for a multi-parallel battery system, characterized in that: The energy storage converter includes a communication circuit and a wake-up circuit, and the energy storage converter exchanges information with the multi-parallel battery system through the communication circuit; and the battery systems exchange information with each other through the wake-up circuit; When the energy storage converter can charge the under-voltage battery system, the online battery system that is not under voltage receives a charging instruction and wakes up the under-voltage battery system through the wake-up circuit; When a battery system is under voltage, the charging switch corresponding to the battery system is turned off, the battery system enters an offline hibernation state, and the communication between the battery system and the energy storage converter is interrupted; When the under-voltage battery system is woken up, the host in the multi-parallel battery system sends an instruction to control the charging switch corresponding to the under-voltage battery system to be turned on, and the energy storage converter charges the under-voltage battery system; The communication circuit is RS485 or CAN communication; The wake-up circuit is RS485 or CAN communication.

2. A method of managing a plurality of parallel battery systems, characterized by: The energy storage converter exchanges information with the multi-parallel battery system through the communication circuit; and the battery systems exchange information with each other through the wake-up circuit; When the energy storage converter can charge the under-voltage battery system, the online battery system that is not under voltage receives a charging instruction and wakes up the under-voltage battery system through the wake-up circuit; When a battery system is under voltage, the charging switch corresponding to the battery system is turned off, the battery system enters an offline hibernation state, and the communication between the battery system and the energy storage converter is interrupted; When the under-voltage battery system is woken up, the host in the multi-parallel battery system sends an instruction to control the charging switch corresponding to the under-voltage battery system to be turned on, and the energy storage converter charges the under-voltage battery system; The communication circuit is RS485 or CAN communication; The wake-up circuit is RS485 or CAN communication.

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