General lithium battery pack series-parallel connection framework

Abstract

The invention discloses a general lithium battery pack series-parallel connection framework which comprises a plurality of battery packs connected in series or in parallel and a plurality of control modules corresponding to the battery packs respectively. Each battery pack is independently charged and managed by one control module, when an over-voltage and over-charging phenomena occurs, the adverse influences caused by faults can be isolated and limited in an independent local module, and the function of a whole battery system is not affected. The control module comprises a series equalization circuit and a parallel equalization circuit, the series equalization circuit is used for controlling the voltage equalization between the series battery packs and / or a plurality of battery cells in the battery packs, and the parallel equalization circuit is used for automatically equalizing the current of the battery cells in the parallel battery packs. Through the series equalization circuit and the parallel equalization circuit, the requirement for consistency between the series battery packs and / or between the single cells in the battery packs and between the parallel battery packs is lowered, and the feasibility of series-parallel use of the battery packs is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a series-parallel structure of a general lithium battery pack. Background technique [0002] Due to its special physical and chemical characteristics and electrical indicators, lithium-ion batteries often need to be customized in practical applications based on indicators such as voltage, capacity, and external dimensions, that is, smaller single battery packs are connected in series or parallel to form a large battery system to increase voltage and capacity. At the same time, a corresponding electrical battery management system (BMS) is also required to meet specific actual needs. [0003] The existing system architecture of this customized outer box and matching corresponding BMS has the following disadvantages: 1. The battery box has a complex shape and structure, poor versatility, and cannot be directly replaced with the existing lead-acid system in the market; 2. ...

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Problems solved by technology

[0003] The existing system architecture of this customized outer box and matching corresponding BMS has the following disadvantages: 1. The battery box has a complex shape and structure, poor versatility, and cannot be directly replaced with the existing lead-acid system in the market; 2. The entire battery system is Guaranteeing performance and safety requires high consistency of single cells in the battery pack; 3. When a single battery pack fails, the entire battery system must be replaced, which is costly and poor in maintainability; 4. BMS circuit structure is complex and reliability is poor; 5. Relying on connectors, wire harnesses or other communication links to transmit data, high cost and poor reliability; 6. Most designs add protection functions to each single battery pack, resulting in large power loss; 7. Most designs use discharge Balanced, poor effect, large loss; 8. When the battery packs are used in series, factors such as poor consistency and performance degradation of a single battery pack will cause the entire battery system to fail, and the reliability of the battery system is low; 9. When the battery packs are connected in parallel, there is no special Current sharing design, it is easy to cause problems such as poor consistency and performance degradation during use

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