Method for determining largest use current of lithium-ion battery
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF5 Cites 7 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
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 ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more