Lithium-ion batteries in parallel charging

Aims to increase the capacity of the lithium-ion batteries in parallel, therefore, parallel charging lithium-ion batteries compared with single lithium ion battery with different design features, mainly on the consistency in design and parallel battery charging current.
Characteristics of lithium-ion batteries in parallel are: constant voltage, battery capacity addition, resistance decreases battery life extended. Parallel charging is the core content of the size and role of the current. According to the theory，current is equal to the current of each branch and, therefore, have been combined as the battery n parallel li ion battery to achieve with the same single-cell charging efficiency, charging current for a number of current lithium-ion batteries, and Ohm's law:I=U/R under the formula, the design is reasonable. However, the parallel battery internal resistance will also change according to the parallel resistance formula, two parallel the total resistance of lithium-ion batteries rather than the product of two battery internal resistances and the ratio of parallel resistance will decrease with the increase of number of batteries in parallel. Therefore, parallel charging of lithium battery efficiency at rated current is less than the number of parallel current lithium-ion batteries and on the basis of the implementation.
Parallel consistency problems should pay attention to the battery with lithium-ion batteries, because consistency is poor lithium parallel battery occurred during charging, it will not power or overcharge, which damage cell structures, affecting the overall battery life. Therefore, the selection of batteries in parallel should avoid different brands, different capacities and different old and new levels of lithium batteries. Consistency is the inherent requirement to battery: lithium battery voltage difference less than 10mV, internal resistance difference ≤5Mω, poor capacity ≤20mA.
Actually, lithium battery parallel will has a charging protection chip on lithium battery for charging protection, lithium battery production manufacturers in making parallel lithium battery has full consider has lithium battery parallel of changes features, is according to above requirements for current design and electric core select of, so, using who need according to parallel lithium battery of description step by step to for charging, avoid not right of charging on battery may caused of damage.

Contact:
Person: Tim.lee
Company: Dongguan Large Electronics Co., Ltd
Add: Block A, Gaosheng Technology Zone, Nancheng District, Dongguan City, Guangdong Province, CN
Tel: 86-769-23182621
Email: Tim.lee@largepower.cn
Site: www.lithiumion-batterypack.com

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