Method for equilibrium control of battery set and battery set charging method

A balance control, battery pack technology, applied in the direction of secondary battery charging/discharging, battery circuit device, secondary battery repair/maintenance, etc., can solve the problems of uncontrollable parameter setting, simple circuit, low reliability, etc. Wide range, extended range, high reliability effect

Active Publication Date: 2009-07-01
SHENZHEN BAK POWER BATTERY CO LTD
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AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned equalization circuit is only composed of comparators and resistors. The circuit is too simple and has low reliability. Moreover, when the number of batteries in the battery pack is large or the application environment is complex, the control parameters cannot be flexibly set. small range

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  • Method for equilibrium control of battery set and battery set charging method
  • Method for equilibrium control of battery set and battery set charging method
  • Method for equilibrium control of battery set and battery set charging method

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Embodiment Construction

[0038] First, some basic concepts and principles of battery balancing are introduced:

[0039] A lithium battery pack usually consists of one or several battery packs connected in parallel, and each battery pack consists of 3 to 4 batteries connected in series. This combination satisfies both the voltage and power requirements of notebook computers, medical equipment, test instruments, and industrial applications. However, this commonly used configuration is often not optimal because mismatching the capacity of one series-connected battery with the others will reduce the capacity of the entire battery pack.

[0040] A common mismatch in battery capacity is a state of charge (SOC) mismatch. In this case, the total capacity of the battery pack can only reach the capacity of the weakest battery. Generally speaking, the cause of battery mismatch is imperfect process control and detection methods, rather than changes in the chemical properties of lithium ions themselves. For exa...

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Abstract

The invention discloses a method for achieving battery pack balance control and a battery pack charging method. The method for achieving battery pack balance control comprises the following steps: determining whether the voltages of all single batteries are in a set voltage range by a battery management chip or a singlechip, if so, measuring the magnitude of a charge current by a current detection resistor when the voltage of a single battery is larger than the balance voltage and the voltage difference between the battery and the battery with the lowest voltage is larger than a balance upper limit difference; setting corresponding balance current according to the magnitude of the charge current, and carrying out energy balance; stopping discharge of the battery when the voltage of the balanced battery is less than the balance voltage or the voltage difference between the balanced battery and the battery with the lowest voltage is lower than the balance lower limit difference. Under the centralized control of the chip or the singlechip, the method has the advantages of high reliability, flexible setting of various control parameters and wide application range.

Description

【Technical field】 [0001] The invention relates to the technical field of batteries, in particular to a method for balancing control on a battery pack and a charging method for the battery pack. 【Background technique】 [0002] Li-ion batteries have no memory effect and are therefore ideal for rechargeable batteries. At present, lithium-ion batteries have begun to be used in the fields of electrical tools and electric vehicles. Most of the lithium-ion batteries in this application field are multi-cell lithium-ion series applications. [0003] The series application of multiple lithium-ion batteries has high requirements on the consistency of lithium-ion batteries, because in the series application of multiple batteries, if one of the batteries (assumed to be CELL3) has a small capacity and a large internal resistance, then its During the discharge process, it will reach the over-discharge protection voltage first than other batteries, and the battery management chip will disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02J7/00
CPCY02E60/12Y02E60/10
Inventor 李春青
Owner SHENZHEN BAK POWER BATTERY CO LTD
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