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Discharge Control Method for Parallel Battery Pack

A technology of discharge control and series-connected battery packs, which is applied in the direction of secondary battery charging/discharging, battery circuit devices, arrangement of multiple synchronous batteries, etc., and can solve problems such as inconsistency in battery degradation, adjustment of discharge current, and over-discharge

Active Publication Date: 2020-06-19
刘铭新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention solves the problem that in the existing parallel battery pack discharge control method, the performance difference of multiple parallel battery packs is not considered, and the discharge current cannot be dynamically adjusted according to the state of the battery pack during the discharge process, resulting in over-discharge or failure to empty. situation, and the use of equalization technology in existing discharge methods still cannot effectively solve the problem of inconsistency caused by battery degradation

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  • Discharge Control Method for Parallel Battery Pack
  • Discharge Control Method for Parallel Battery Pack
  • Discharge Control Method for Parallel Battery Pack

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specific Embodiment approach 1

[0028] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. The generalized current sharing control method for parallel battery packs described in this embodiment is to use multiple power sources connected in parallel to discharge the parallel battery packs. The discharge currents of multiple series battery packs connected in parallel, the discharge currents output by the multiple power sources are allocated according to the proportion of the remaining energy of the corresponding series battery packs.

[0029] In this embodiment, the distribution ratio of the discharge current output by multiple power supplies can be: Kpower(1):Kpower(2):...:Kpower(m), where m is a positive integer greater than 1, where Kpower(j) is the battery energy index of the series battery pack corresponding to the jth power supply, j=1, 2,..., m; the battery energy index Kpower(j) of the series battery pack is calculated by the following formula:

[0030]

[0031] In the formula, Vi is the terminal vol...

specific Embodiment approach 2

[0035] Specific Embodiment 2. This embodiment describes a discharge control method for parallel battery packs. The discharge control method is based on the generalized current sharing control method for parallel battery packs described in specific embodiment 1. The parallel battery packs are composed of m series battery packs are connected in parallel, and each series battery pack is composed of n+w battery cells in series. The discharge method is to use m power supplies and m battery packs to control the discharge current in one-to-one correspondence. The discharge method is to The discharge process is divided into multiple unit discharge control cycles, and each discharge control cycle is 0.1 to 2 minutes; in each unit discharge control cycle, keep n battery cells in each series battery pack online, and the remaining w battery cells are offline; At the end of each unit discharge control cycle, adjust the battery cells that are discharged online in m series battery packs. The ...

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Abstract

The invention provides a generalized current sharing control method of a banked battery and a discharging control method based on the current sharing control method, relates to discharging control technologies of the banked battery, belongs to the technical field of battery pack control, and solves the problem that the discharging current cannot be adjusted according to performance of the banked battery in a present discharging method of the banked battery. According to the generalized current sharing control method of the banked battery, discharging currents of serial battery packs in parallel connection are controlled by multiple power supplies in the discharging process, and the discharging currents output by the power supplies are distributed according to the proportion of a battery energy index Kpower(j) of the battery packs in parallel connection. According to the discharging control method of the banked battery, a discharging process is divided into unit discharging control periods, each discharge control period is 0.1 to 2 minutes, and in each discharging period, the above generalized current sharing control method is used to adjust the discharging currents of the serial battery packs in parallel connection. The methods are suitable for discharging control for the banked battery.

Description

technical field [0001] The invention relates to the charging and discharging control technology of storage batteries, and belongs to the technical field of storage battery control. Background technique [0002] As a kind of electric energy storage device, the battery pack must be used as a battery pack after being connected in series because the voltage provided by the single battery is much lower than the power supply voltage requirement of the load equipment. Such as figure 1 shown [0003] Since all the battery cells in the battery pack are directly connected in series, the charging and discharging currents of the connected battery cells are exactly the same, and all the battery cells can be charged and discharged at the same time at the same time. Ideally, the voltage of the single cells is equal, so the charging and discharging voltage of the battery pack is the voltage of the single cells * the number of single cells; but in the actual use environment, due to the inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/441H01M2010/4271H02J7/0016H02J7/0019Y02E60/10
Inventor 刘铭新
Owner 刘铭新
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