Electric current balancing method and system for multi-battery or multi-battery-pack parallel connection charging or discharging

A current balancing and charging current technology, applied in battery energy storage and application, in the field of current balancing in parallel charging or discharging of multiple batteries or multiple battery packs.

Active Publication Date: 2014-04-30
云储新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] From the above analysis, it can be seen that the existing current sharing method is relatively complicated, and is suitable for application scenarios with high precision requirements and low circuit complexity requirements.
If it is required to use the fewest components and the simplest method to achieve current sharing, the above methods are difficult to meet the requirements; at the same time, the above methods are mainly used for continuous current sharing. In many application scenarios, the discharge current is not always continuous current sharing. As long as the average current of each branch current is averaged

Method used

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  • Electric current balancing method and system for multi-battery or multi-battery-pack parallel connection charging or discharging

Examples

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Embodiment 1

[0020] (1) Embodiment 1: Each battery pack or battery packs are discharged in parallel

[0021] Assume cells or packs 1 through N are all 10V, and only pack 2 is at 10.5V. When discharging in parallel, the discharge currents of the branches 1 of the batteries or battery packs 1, 3, 4, ... N are all equal, equal to 100A. The voltage of the battery or battery pack 2 is relatively high, so its branch 1 discharge current will be higher than 100A, let's say 120A. At this time, the method of current sharing is: to control the branch 1 switch of the battery or battery pack 2 with a certain pulse width, such as 80%, and the switch is disconnected for 20% of the time, thereby forcing the current to flow through the branch. 2. Assume that the voltage drop of the step-down component is 1V, so that during the time when 20% of the current in branch 2 flows, the current in branch 2 is actually relatively small, for example, only 10A. Then the actual output current of the battery or the b...

Embodiment 2

[0022] (2) Embodiment 2: Each battery pack or battery packs are charged in parallel

[0023] Assume cells or packs 1 to N are all 10V, and only pack 2 is 9.5V. When charging in parallel, the charging currents of the branches 1 of the batteries or battery packs 1, 3, 4, ... N are all equal, equal to 100A. The voltage of the battery or battery pack 2 is relatively low, so its branch 1 charging current will be higher than 100A, let's say 120A. At this time, the method of current sharing is: to control the branch 1 switch of the battery or battery pack 2 with a certain pulse width, such as 80%, and the switch is disconnected for 20% of the time, thereby forcing the current to flow through the branch. 2. Assume that the voltage drop of the step-down component is 1V, so that during the time when 20% of the current in branch 2 flows, the current in branch 2 is actually relatively small, for example, only 10A. Then the actual charging current of the battery or the battery pack 2 is...

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Abstract

The invention provides an electric current balancing method and system for multi-battery or multi-battery-pack parallel connection charging or discharging. The electric current balancing method and system are suitable for discontinuous currents, easy to implement and effective in implementation. The electric current balancing method and system comprise a plurality of parallel branches formed by a plurality of batteries or battery packs, each parallel branch comprises a battery or battery pack, a low-resistance switch passage and a voltage reduction component passage, and the low-resistance switch passages are connected with the voltage reduction component passages in parallel. When low-resistance switches are turned on, discharged or charged currents only flow through the low-resistance switch passages, the low-resistance switches are controlled by the pulse width adjustment to be turned on or turned off, and the discharged or charged currents of the batteries or battery packs are adjusted in real time; When the low-resistance switches are turned off, the currents only flow through the voltage reduction component passages, and voltage reduction components adjust the voltage, relative to other batteries or battery packs, of the batteries or battery packs. Balancing of the charged and discharged charge number of the multiple batteries or battery packs is achieved by a plurality of algorithms through time integrations, and the balanced control over the discharged current or the charged current when the multiple batteries or battery packs are charged and discharged in a parallel connection mode is achieved.

Description

technical field [0001] The invention belongs to the field of battery electric energy storage and application, and specifically relates to the technical field of current balance for charging or discharging multiple batteries or multiple battery packs connected in parallel. Background technique [0002] In comprehensive application systems involving multiple batteries, such as battery backup systems and battery energy storage systems, parallel charging or discharging of multiple batteries or multiple battery packs is inevitable. Due to the difference in voltage between multiple batteries or between multiple battery packs, when charging or discharging in parallel, if a simple circuit is directly connected in parallel, there will be a current imbalance between each battery and battery pack. [0003] There are many kinds of current sharing technologies for parallel connection of batteries, which can be roughly classified into the following categories: [0004] (1) Input and outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 慈松王强文
Owner 云储新能源科技有限公司
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