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Fault-tolerant large-scale battery series and PCS parallel system

A series system and battery technology, applied in battery circuit devices, secondary battery repair/maintenance, collectors, etc., can solve the problems of inconvenient maintenance of battery systems, increase anti-risk capabilities, prolong backup time, and increase capacity Effect

Inactive Publication Date: 2019-06-07
广州宝狮新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention proposes a compatible fault-tolerant large-scale battery and PCS parallel system, which solves the problem of inconvenient maintenance of the battery system in the prior art

Method used

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  • Fault-tolerant large-scale battery series and PCS parallel system

Examples

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Effect test

Embodiment 1

[0023] see figure 1 , a compatible and fault-tolerant large-scale battery series system, including a high-voltage box PDU and N groups of battery modules connected in series, where N is an integer greater than or equal to 2.

[0024] Each battery module includes a lithium battery pack, battery series system slave control unit BMU, pre-charging resistor Rn, relay Kn-1, relay Kn-2, relay Kn-3 and fuse Fn, the fuse and relay Kn- 1 working circuit, the pre-charging circuit composed of the pre-charging resistance Rn and the relay Kn-3, the shielding circuit composed of the relay Kn-3; the working circuit, the pre-charging circuit and the shielding circuit are connected in parallel, wherein n is a variable, taking an integer between 1-N. The lithium battery pack consists of M strings of lithium cells (BT1...BTM), where M is a positive integer. When M=16, a lithium battery pack outputs 48V, and those skilled in the art can set appropriate N and M according to specific scenarios.

...

Embodiment 2

[0042] see figure 2 , a compatible and fault-tolerant large-scale battery PCS parallel system, including K clusters of the aforementioned compatible and fault-tolerant large-scale battery series systems, and the K clusters of battery series systems are output in parallel.

[0043] Further, the K cluster battery series system is connected to the total output through respective PCS-k, wherein k is a variable, taking an integer between 1-N.

[0044] The process of starting the battery PCS parallel system is as follows:

[0045]The first step is to close the relay Kn-1 of each module in each battery series system, connect all battery modules in series, close the total negative relay, connect the total negative pole B- of N groups of battery modules to PCS, and close the pre-charge Relays, N sets of battery modules charge the internal capacitors of the PCS;

[0046] In the second step, after the pre-charging is completed, close the main positive relay, connect the main positive ...

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Abstract

The invention relates to the technical field of batteries, and provides a fault-tolerant large-scale battery and PCS parallel system. The system comprises a high-voltage box PDU and N groups of battery modules connected in series, Each battery module comprises a lithium battery pack, a slave control BMU of a battery series system, a working loop, a pre-charging loop and a shielding loop formed bya relay Kn-3, wherein the working loop, the pre-charging loop and the shielding loop are connected in parallel; and the high-voltage box PDU is connected with N groups of battery modules connected inseries, and comprises a main control BCU of the battery series system, a switching power supply, a main positive charge and discharge loop, a main negative charge and discharge loop and a pre-charge unit. The invention further provides a fault-tolerant large-scale battery PCS parallel system, and the multi-cluster battery series systems are connected in a parallel manner for output. The system canshield a defective battery module in the battery modules in a bypass mode through the shielding loop, so that the system continues to operate, thereby improving the anti-risk capacity of the system.Meanwhile, the capacity and the output power are improved through the battery PCS parallel system.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a compatible fault-tolerant large-scale battery series and PCS parallel system. Background technique [0002] Battery management systems are increasingly used in the field of high-voltage DC power supply systems. In order to achieve high-voltage output, the battery system uses multiple battery modules connected in series, and each battery module generally consists of multiple strings of iron-lithium cells. Therefore, when one of the battery cells of the module fails, the battery system can only be stopped to disassemble and repair or replace the faulty module battery cell. This is very detrimental to the maintenance and continuous work of the battery system. In addition, in order to prolong the backup time of the battery pack, the capacity of the battery pack system connected in series may be insufficient, and the output power of the battery system is limited. Contents of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H02J7/00
CPCY02E60/10
Inventor 周玉坤魏亚海徐权文
Owner 广州宝狮新能源有限公司
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