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Lithium battery flexible integration method and system for simulating electrical characteristics of lead-acid battery

A technology for simulating the electrical characteristics of lead-acid batteries, applied to battery circuit devices, secondary batteries, electrical components, etc., can solve the problems of complex lithium battery management system, difficult application, low voltage of single lithium battery, etc., and achieve rapid prediction The effect of remaining power, good adaptability, and avoiding inhomogeneity

Active Publication Date: 2021-04-06
重庆宏一电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are certain development limitations in the application of lithium batteries
First of all, due to the nonlinear relationship between the voltage and power of lithium batteries, the management system of lithium batteries is more complex, and its power calculation is more complicated, which is difficult to apply in the use scene of lead-acid batteries
Secondly, due to the low voltage of a single-cell lithium battery (the voltage range of a ternary lithium battery is about 3.6V-4.25V) and the small capacity, in the actual use process, a high-voltage large-capacity battery pack is obtained by connecting several batteries in series. However, due to the differences in the internal performance, use environment and cycle times of single lithium battery packs, the working characteristics of the single lithium battery packs will be inconsistent. Inconsistencies are constantly scaled during use
This inconsistency will not only reduce the capacity of the battery pack, but even cause safety accidents in severe cases

Method used

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  • Lithium battery flexible integration method and system for simulating electrical characteristics of lead-acid battery
  • Lithium battery flexible integration method and system for simulating electrical characteristics of lead-acid battery
  • Lithium battery flexible integration method and system for simulating electrical characteristics of lead-acid battery

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Embodiment 1

[0080] The battery pack is composed of N single lithium batteries connected in parallel, N≥1. The nonlinear output characteristics of the single lithium battery are provided by the manufacturer, and the nonlinear electrical characteristics of the battery pack are obtained by superimposing the nonlinear electrical characteristics of the single lithium battery: Let the coordinate points on the nonlinear electrical characteristic curve of the battery pack be expressed as (SOC ,V ocv ), then SOC=(soc 1 +soc 2 +...+soc i +soc N ) / N, V OCV =f(V S ), SOC indicates the remaining capacity of the battery pack, V S Indicates the output voltage of a single lithium battery, soc i Indicates that the i-th single lithium battery corresponds to V S , i={1,2,...,N}.

[0081] refer to figure 2 As shown, the following is a specific description in conjunction with two single lithium batteries (lithium battery cells) with different output characteristics. The DC / DC converter uses the out...

Embodiment 2

[0093] The battery pack is composed of two single lithium batteries in series, and the battery pack is connected in parallel with an equalizing circuit, so that the output voltage of each single lithium battery is equal; the nonlinear output characteristics of the single lithium battery are provided by the manufacturer, and the nonlinear electrical characteristics of the battery pack Obtained by the superposition of nonlinear electrical characteristics of a single lithium battery:

[0094] Let the coordinate points on the nonlinear electrical characteristic curve of the battery pack be expressed as (SOC, V OCV ), then SOC=(soc 1 +soc 2 ) / 2, V OCV =f(V S ), SOC indicates the remaining capacity of the battery pack, V S Indicates the output voltage of a single lithium battery, soc i Indicates that the i-th single lithium battery corresponds to V S , i={1,2}.

[0095] refer to image 3 As shown, the following is a specific description in conjunction with two single lithium...

Embodiment 3

[0099] The battery pack is composed of N single lithium batteries in series, N>2, and the battery pack is connected in parallel with an equalizing circuit, so that the output voltage of each single lithium battery is equal; the nonlinear output characteristics of the single lithium batteries are provided by the manufacturer, and the battery pack’s The nonlinear electrical characteristics are obtained by superimposing the nonlinear electrical characteristics of a single lithium battery:

[0100] Let the coordinate points on the nonlinear electrical characteristic curve of the battery pack be expressed as (SOC, V OCV ), then SOC=(soc 1 +soc 2 +...+soc i +soc N ) / N, V OCV =f(V S ), SOC indicates the remaining capacity of the battery pack, V' indicates the output voltage of the battery pack, V S Indicates the output voltage of a single lithium battery, soc i Indicates that the i-th single lithium battery corresponds to V S , i={1,2,...,N}.

[0101] refer to Figure 4 As ...

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Abstract

The invention discloses a lithium battery flexible integration method and system for simulating the electrical characteristics of lead-acid batteries, comprising the following steps: step 1: selecting single or multiple single lithium batteries to form a battery pack according to capacity requirements; The open circuit voltage V ocv Nonlinear electrical characteristics with the remaining power SOC; Step 3: The DC / DC converter uses the output voltage V' of the battery pack as the input voltage V in , according to the change of the SOC of the remaining power and through the nonlinear transformation model to the input voltage V in Perform variable scaling to obtain the output voltage V out , so that the output voltage V out It has a linear relationship with the remaining power SOC of the battery pack. The system of the present invention includes a battery pack, a DC / DC converter and a nonlinear conversion model. The invention makes the integrated system have the linear output characteristic of the lead-acid battery, has the advantages of both the lithium battery and the lead-acid battery, has linear output, large capacity and light weight, and is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for simulating the electrical characteristics of a lead-acid battery by using a lithium battery or a lithium battery pack and a linear power supply. Background technique [0002] At present, there is a crisis of energy depletion, and the calls for reducing pollution, saving resources, and taking the road of sustainable development are increasing worldwide. Faced with such a situation, the automobile industry regards the development of electric vehicles as the future development direction of the automobile industry, that is, the application of new energy and new power in automobiles. Although some traditional energy sources are currently used in automobiles, new energy sources such as fuel cells, natural gas, and hydrogen fuel are gradually penetrating into various domestic automobile companies. One of the technologies related to the development of electric veh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H02J7/00
CPCH01M10/4207H02J7/0063Y02E60/10
Inventor 章治国易嘉欣杜海忠李山
Owner 重庆宏一电气有限公司
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