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A control method, system and terminal equipment for charging and discharging current of a battery

A charge and discharge current and battery discharge technology, which is applied in the direction of secondary battery charging/discharging, battery circuit devices, secondary batteries, etc., can solve problems affecting battery life, affecting battery performance, and affecting battery use safety, etc., to ensure safety effect

Active Publication Date: 2021-04-02
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 battery charge and discharge current control method, system and terminal equipment to solve the problem of the current control method of lithium battery charge and discharge current due to the fact that the maximum allowable charge and discharge current is a fixed threshold. Battery life, affecting battery performance and affecting battery safety and other issues

Method used

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  • A control method, system and terminal equipment for charging and discharging current of a battery
  • A control method, system and terminal equipment for charging and discharging current of a battery
  • A control method, system and terminal equipment for charging and discharging current of a battery

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Embodiment 1

[0045] like figure 1 As shown, this embodiment provides a method for controlling the charging and discharging current of a battery, which specifically includes:

[0046] Step S101: Obtain the highest SOC limit for battery charging, the lowest SOC limit for battery discharge, the current battery SOC value, the current maximum discharge capacity of the battery, and the current battery cell temperature.

[0047] In specific applications, SOC refers to the state of charge of the battery, also known as the remaining capacity, which refers to the ratio of the remaining capacity of the battery to the capacity of the fully charged state, usually expressed as a percentage. The maximum SOC limit of battery charging refers to a preset maximum value of SOC during battery charging, for example, 100%. The minimum battery discharge SOC limit refers to a preset minimum value of the SOC during battery discharge, for example, 5%.

[0048] In a specific application, the battery management syst...

Embodiment 2

[0082] like Figure 4 As shown, in this embodiment, step S104 in Embodiment 1 specifically includes:

[0083] Step S201: Comparing the first maximum allowable charging current and the second maximum allowable charging current, and determining the maximum value of the first maximum allowable charging current and the second maximum allowable charging current as the target maximum allowable charging current .

[0084] In a specific application, the calculation formula for determining the target maximum allowable charging current above is: in, is the first maximum allowable charging current, is the second maximum allowable charging current.

[0085] Figure 5 It shows the change curve of the current battery SOC value with time during the charging process, Image 6 It shows the change curve of the maximum allowable charge and discharge current during the discharge process when the maximum SOC limit of battery charge is 100%. Depend on Image 6 It can be seen that when th...

Embodiment 3

[0090] like Figure 9 As shown, this embodiment provides a battery charge and discharge current control system 100 for executing the method steps in Embodiment 1, which includes an acquisition module 101 , a calculation module 102 , a temperature module 103 , a determination module 104 and a control module 105 .

[0091] The obtaining module 101 is used to obtain the highest SOC limit for battery charging, the lowest SOC limit for battery discharge, the current battery SOC value, the current maximum discharge capacity of the battery, and the current cell temperature.

[0092] The calculation module 102 is used to calculate a first maximum allowable charging and discharging current according to the highest battery charging SOC limit, the battery discharging lowest SOC limit, the current battery SOC value, and the current battery maximum discharge capacity.

[0093] The temperature module 103 is used to obtain the second maximum allowable charging and discharging current accord...

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Abstract

The invention is applicable to the technical field of batteries, and provides a battery charge-discharge current control method and system and terminal equipment. The battery charge-discharge currentcontrol method comprises the steps of acquiring a battery charge highest SOC limit value, a battery discharge lowest SOC limit value, a current battery SOC value, current battery maximum discharge capacity and a current battery cell temperature; calculating a first maximum allowable charge-discharge current; acquiring a second maximum allowable charge-discharge current according to the current battery cell temperature; determining a target maximum allowable charge-discharge current according to the first maximum allowable charge-discharge current and the second maximum allowable charge-discharge current; and controlling the charge-discharge current not to exceed the target maximum allowable charge-discharge current. The maximum allowable charge-discharge current is adjusted in real time according to actual battery SOC and the current battery cell temperature, the dynamic adjustment of the maximum allowable charge-discharge current is achieved, and the charge-discharge safety and the battery lifetime are ensured by controlling the actual charge-discharge current not to exceed the maximum allowable charge-discharge current during the charge-discharge process.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a control method, system and terminal equipment for charging and discharging current of batteries. Background technique [0002] At present, the maximum allowable charging and discharging current of lithium-ion batteries is limited by setting a fixed threshold. During the charging and discharging process, the battery management system controls the actual charging and discharging current in real time to ensure that the charging and discharging current does not exceed the set fixed threshold. Discharge safety and battery life. Since the working range of the battery is specified within a specific SOC range, when the actual SOC of the battery is close to the minimum or maximum SOC, the maximum allowable discharge current or the maximum allowable charge current needs to change with the change of the SOC to better protect the battery. The current maximum allowable chargi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H02J7/00
CPCH02J7/0077H02J7/0091H01M10/44H01M10/443H01M10/446H01M10/448Y02E60/10
Inventor 吴明舒星
Owner 江西猛犸电动科技有限公司