Charging method and device of lithium ion battery and terminal equipment

A lithium-ion battery, charging method technology, applied in battery circuit devices, secondary battery charging/discharging, circuit devices, etc., can solve problems affecting lithium-ion battery life, lithium-ion battery combustion, temperature rise, etc. Efficiency, reduced charging time, effect of low temperature increase

Inactive Publication Date: 2019-08-13
江西猛犸电动科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a lithium-ion battery charging method, device and terminal equipment to solve the problem that in the prior art, due to the constant charging current, the temperature of the lithium-ion battery will continue to rise, and excessive temperature rise will cause Causes lithium-ion batteries to burn or even explode, affecting the life of lithium-ion batteries

Method used

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  • Charging method and device of lithium ion battery and terminal equipment
  • Charging method and device of lithium ion battery and terminal equipment
  • Charging method and device of lithium ion battery and terminal equipment

Examples

Experimental program
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Embodiment 1

[0053] Such as figure 1 As shown, this embodiment provides a lithium ion battery charging method, which can be applied to terminal equipment such as lithium ion battery intelligent charging devices, electric motorcycle charging devices and the like. The charging method of the lithium-ion battery provided by the present embodiment includes:

[0054] S101. Obtain the first relationship between the remaining power of the lithium-ion battery and the open circuit voltage, the second relationship between the remaining power of the lithium-ion battery and the ohmic internal resistance, and the relationship between the remaining power of the lithium-ion battery and the polarization voltage third relationship.

[0055] In a specific application, carry out HPPC test under different temperature to lithium-ion battery, obtain test result (namely the first relationship between the remaining power of lithium-ion battery and the open circuit voltage, between the remaining power of lithium-i...

Embodiment 2

[0066] Such as figure 2 As shown, this embodiment is a further description of the method steps in the first embodiment. In this embodiment, step S102 includes:

[0067] S1021. Establish a first-order equivalent circuit model of the lithium-ion battery, and obtain a space state equation of the lithium-ion battery.

[0068] In a specific application, a first-order equivalent circuit model (ECM) of a lithium-ion battery is established, and its equivalent circuit model is as follows: image 3 As shown, the mathematical model is obtained as follows:

[0069]

[0070] Among them, U t Is the terminal voltage, I is the charge and discharge current, R Ω is the internal resistance of the battery, U p is the polarization resistance R p and polarized capacitance C p pressure drop, U d Indicates the internal resistance R Ω pressure drop.

[0071] The remaining power of the lithium-ion battery can be obtained by the ampere-hour integration method:

[0072]

[0073] Among t...

Embodiment 3

[0092] Such as Figure 6 As shown, this embodiment is a further description of the method steps in the first embodiment. In this embodiment, step S1025 includes:

[0093] S10251. Perform charging experiments on the lithium-ion battery at different charging currents, calculate the remaining power, open-circuit voltage, and ohmic internal resistance according to the space state equation, and obtain the corresponding charging rates of the lithium-ion battery at different charging rates. Polarization voltage.

[0094] In specific applications, charging experiments are carried out on lithium-ion batteries at different charging currents, and the remaining power, open-circuit voltage and ohmic internal resistance of lithium-ion batteries are calculated according to the above space state equation, and lithium-ion batteries are obtained under different charging rates. Corresponding polarization voltage. Figure 7 Exemplary diagrams showing polarization voltage curves of lithium-ion ...

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Abstract

The invention is applicable to the technical field of lithium ion batteries, and provides a charging method and device of a lithium ion battery and terminal equipment. The method comprises the following steps: obtaining a first relation between the remaining electric quantity and an open-circuit voltage of the lithium ion battery, a second relation between the remaining electric quantity and the ohmic internal resistance of the lithium ion battery, and a third relation between the remaining electric quantity and a polarization voltage of the lithium ion battery; and performing polynomial fitting on the first, second and the third relations according to the estimated temperature of the lithium ion battery, obtaining the estimated temperature of the lithium ion battery, and performing charging current optimization according to the estimated temperature to obtain a charging current sequence with the minimum battery temperature increment after optimization. According to the invention, thetemperature increment of the battery in the charging process is relatively low, the charging time is shortened, the influence of temperature rise on the service life of the battery in the charging process is reduced, and the charging efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a charging method, device and terminal equipment for lithium ion batteries. Background technique [0002] At present, the charging method of constant current and constant voltage is mostly used to charge the lithium-ion battery / lithium-ion battery pack, that is, to charge the lithium-ion battery / lithium-ion battery pack at a constant current in the constant current stage. [0003] Although the above method is simple to control, during the charging process by the above method, due to the constant charging current, the temperature of the lithium-ion battery will continue to rise. Excessive temperature rise will cause the lithium-ion battery to burn or even explode, affecting the life of the lithium-ion battery. . Contents of the invention [0004] In view of this, the embodiment of the present invention provides a lithium-ion battery charging method, de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02J7/00
CPCH02J7/0077H02J7/0091H01M10/44H01M10/443Y02E60/10
Inventor 吴明舒星
Owner 江西猛犸电动科技有限公司
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