Lithium-ion battery charge management circuit and method

A charging management circuit and charging management technology, applied in the direction of secondary battery charging/discharging, battery circuit devices, circuits, etc., can solve the problems of inability to maintain stability, occupying more area and cost, and requiring external output loads, etc. The effect of better charging effect, lower charging cost, and improved load compatibility

Pending Publication Date: 2018-08-28
嘉兴飞童电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the constant voltage charging stage, a loop needs to be built to correct the charging output voltage in real time. If there is a loop, there will be stability problems. In order to make the loop reliable and stable, a large number of compensation capacitors are required inside the chip, which occupies a lot of area and cost; even so, it is still Requires external output loads and cannot maintain stability under various load conditions

Method used

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  • Lithium-ion battery charge management circuit and method

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Embodiment 1

[0030] Embodiment one: if figure 1 As shown, it is only one of the embodiments of the present invention. In order to solve the above problems, the present invention adopts the following technical solution to achieve: a lithium battery charge management circuit, which is characterized in that: it includes a charge current setting circuit, a charge voltage control circuit circuit and a current output circuit, the charging current setting circuit includes a first reference voltage 1, a first operational amplifier 2 and an external resistor 3, and the first operational amplifier 2 is connected to the first reference voltage 1 and the external resistor 3 respectively Electrically connected, the charging voltage control circuit includes a second reference voltage 4 and a comparator 5 electrically connected to the second reference voltage 4, the comparator 5 is electrically connected to the first reference voltage 1, and the current The output circuit includes a second operational am...

Embodiment 2

[0041] Embodiment two: if figure 2 As shown, it is only one embodiment of the present invention. Another purpose of the present invention is to expand the protection scope of the above-mentioned lithium battery charging management circuit, propose a lithium battery charging management method, and adopt a lithium battery charging management circuit , the lithium battery charging management circuit includes a charging current setting circuit, a charging voltage control circuit and a current output circuit, and the method includes the following steps:

[0042] S1: The current output circuit charges the battery with a constant current;

[0043] S2: The charging voltage control circuit judges whether the battery voltage reaches the first full threshold, if so, execute step S3; otherwise, return to step S1;

[0044] The first two steps are controlled by the charging voltage control circuit, and the constant current charging is still adopted. After the constant current charging is ...

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Abstract

The present invention provides a lithium-ion battery charge management circuit and method, and relates to the technical field of lithium-ion battery charge management. The lithium-ion battery charge management circuit comprises a charge current set circuit, a charge voltage control circuit and a current output circuit, the charge current set circuit comprises a first reference voltage, a first operational amplifier and an external resistor, the first operational amplifier is electrically connected with the first reference voltage and the external resistor, the charge voltage control circuit comprises a second reference voltage and a comparer electrically connected with the second reference voltage, the comparer is electrically connected with the first reference voltage, and the current output circuit comprises a second operational amplifier and an MOS tube electrically connected with the second operational amplifier. The lithium-ion battery charge management circuit and method are simple in design and better in charge effect, improve the load compatibility, effectively reduce the charge cost, and can be suitable for devices with various high-end and low-end charge demands.

Description

technical field [0001] The invention relates to the technical field of charging management of lithium batteries, [0002] In particular, the present invention relates to a lithium battery charging management circuit and management method. Background technique [0003] With the popularity of lithium batteries, the demand for charging management of lithium batteries is also increasing. Lithium battery charging needs to meet the three-stage charging specification of trickle current, constant current and constant voltage. That is, when the battery voltage is less than 2.9V, small current trickle charging is performed; when the voltage is higher than 2.9V, high current constant current fast charging is performed; when the voltage reaches and approaches 4.2V (depending on the battery material), the Constant voltage charging, the current gradually decreases until it is fully charged. In order to ensure the safety of charging, while protecting the battery life. [0004] The trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42H01M10/48H01M10/44
CPCH02J7/0072H01M10/425H01M10/4257H01M10/44H01M10/488H02J7/0036H02J7/0068H01M2010/4271Y02E60/10
Inventor 乐忠明王全杨景
Owner 嘉兴飞童电子科技有限公司
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