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Method for determining largest use current of lithium-ion battery

A power battery, lithium-ion technology, applied in battery circuit devices, current collectors, electric vehicles, etc., can solve the problem of inaccurate determination of the maximum charging and discharging current of lithium-ion power batteries, to ensure service life, avoid overcharging and Overdischarge, easy to grasp effect

Active Publication Date: 2014-06-18
奇瑞新能源汽车股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of inaccurate determination of the maximum charging and discharging current of a lithium-ion power battery in the prior art, an embodiment of the present invention provides a method for determining the maximum use current of a lithium-ion power battery

Method used

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  • Method for determining largest use current of lithium-ion battery
  • Method for determining largest use current of lithium-ion battery

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Embodiment 1

[0033] The embodiment of the present invention provides a method for determining the maximum use current of a lithium-ion power battery, see figure 1 , methods include:

[0034] Step 101: Use a current of 1 / 3 of the rated capacity of the lithium-ion power battery to be tested to charge and discharge the lithium-ion power battery for 2-3 times. After the cycle operation is completed and fully charged, it is left for 1-2 hours.

[0035] Step 102: Measure the terminal voltage of the lithium-ion power battery and the terminal voltage of the test equipment.

[0036] Step 103: Use a current with a nominal capacity of 1C to discharge the lithium-ion power battery to the end-of-discharge voltage, put it aside for 3-5 minutes, charge it with a current with a nominal capacity of 1C for 12 minutes, put it aside for 3-5 minutes, and use a current of 0.5C*n respectively For discharge, the discharge time is 12S, and the measured discharge voltage is the discharge setting voltage, and the c...

Embodiment 2

[0042] The embodiment of the present invention provides a method for determining the maximum use current of a lithium-ion power battery, see figure 2 , the method includes:

[0043] Step 201: Connect the positive and negative poles of the lithium-ion power battery to the positive and negative poles of the testing device respectively by using test leads, and make sure they are firm.

[0044] Among them, the test equipment is a high-precision lithium-ion battery test equipment that converts alternating current to direct current. In this embodiment, the current resolution of the test equipment is 0.0001A, the voltage resolution is 0.0001V, the data recording resolution is 0.001S, and the maximum range current of the test equipment is 15 to 20 times the actual discharge capacity of the lithium-ion power battery .

[0045] In actual implementation, the resistance of the test lead is also required to be less than or equal to 10mΩ, that is, the contact internal resistance between ...

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Abstract

The invention discloses a method for determining the largest use current of a lithium-ion battery, belonging to the field of lithium-ion batteries for vehicles. The method comprises the following steps of carrying out charge-discharge on the lithium-ion battery for two to three times by adopting a current of one third of the rated capacity of the lithium battery, and putting the battery aside for one to two hours after the battery is fully charged; detecting the end voltage of the battery and testing equipment; discharging the battery to final discharging voltage by adopting a current with 1 C of nominal capacity, charging for 12 minutes by adopting the current of 1 C, respectively discharging by adopting the current of 0.5C*n, and determining the current with the discharging time being 12 seconds and the discharging voltage being a discharging set voltage as the largest discharging current; performing charge-discharge on the battery for two to three times by adopting the current of 1 / 3 C, and putting the battery aside for one to two hours after the battery is fully charged; charging the battery by adopting the current of 1 C to the charging upper limit voltage, discharging the battery for 18 minutes by adopting the current of 1 C, respectively charging by adopting the current of 0.5C*m, and determining the current with the charging time being 12 S and the charging voltage being the charging set voltage as the largest charging current. By applying the method, the largest use current is accurately calculated, and the phenomena of overcharging and overdischarging are avoided.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries for vehicles, in particular to a method for determining the maximum use current of a lithium-ion power battery. Background technique [0002] Lithium-ion power batteries are widely used in the field of electric vehicles due to their own advantages. However, in the use of lithium-ion power batteries, it is found that the existing soft-pack lithium-ion power batteries have different current-carrying capabilities due to the selection of materials, manufacturing processes, and packaging methods. In actual use, BMS (Battery Management System, battery management system) can be used to timely feed back the battery's SOC (State Of Charge, remaining capacity) value to calculate and monitor the true condition of the battery. Under the premise of not affecting the electrical performance of the lithium-ion power battery, the maximum charging and discharging current it can withstand can provide accurate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 高峰柱吴建华
Owner 奇瑞新能源汽车股份有限公司
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