Lithium battery pack monitoring system and monitoring method based on electrical impedance imaging technology
A technology of electrical impedance imaging and lithium battery packs, which is applied to secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as high cost, inconvenient use and maintenance, and complicated circuits, so as to improve service life and circuit Simplicity and the effect of improving system reliability
Active Publication Date: 2017-02-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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[0009] The shape monitoring of lithium battery expansion can be realized by using resistance strain gauges, but this kind of deformation monitoring requires multiple resistance strain gauges to be pasted on the surface of lithium batteries, the circuit is relatively complicated, the cost is relatively high, and it is inconvenient to use and maintain
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[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0025] The flexible packaging polymer lithium battery pack online monitoring system of the present invention mainly consists of a piezoresistive film 1 pasted on the surface of the lithium battery, electrodes 2 evenly distributed on the edge of the piezoresistive film 1, a temperature sensor 3 embedded in the piezoresistive film 1, and a computer information processing unit 4 connected to the electrode 2 and the temperature sensor 3 respectively. Such as figure 1 shown.
[0026] The piezoresistive film 1 of the present invention is made of a flexible conductive rubber material with piezoresistive effect, and its shape and size are determined according to the shape and size of the surface of the lithium battery. The flexible conductive rubber material is formed by filling silicone rubber with composite conductive materials such as carbon black...
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The invention relates to a lithium battery pack monitoring system based on an electrical impedance imaging technology. The lithium battery pack monitoring system comprises a piezoresistance film (1), electrodes (2), a temperature sensor (3) and a computer information processing unit (4), wherein the piezoresistance film (1) is adhered to the surface of a lithium battery, the electrodes (2) are uniformly distributed on the edge of the piezoresistance film (1), the temperature sensor (3) is embedded in the piezoresistance film (1), and the computer information processing unit (4) is respectively connected with the electrodes (2) and the temperature sensor (3). The computer information processing unit (4) can be used for processing voltage information acquired by the electrodes (2) and temperature information acquired by the temperature sensor (3) by adopting the electrical impedance imaging method, deformation information on the surface of the lithium battery can be calculated reversely, the working state of the lithium battery can be judged according to the deformation information, and the lithium battery can be continuously monitored when the deformation information is normal; when the deformation information is abnormal, an alarm is issued, and the deformation of the lithium battery is processed.
Description
technical field [0001] The invention relates to an online monitoring system and a monitoring method of a soft-package polymer lithium battery pack. Background technique [0002] Known as the green chemical energy of the 21st century, the polymer lithium battery has a unit energy and capacity 2 to 3 times higher than that of a general lithium-ion battery. It has superior performance in charge and discharge characteristics, cycle life, and environmental protection. It is widely used in electric power Large-scale energy storage in the industry. However, the soft-packed polymer lithium battery wrapped with aluminum-plastic composite film is extremely vulnerable to damage during overcharge, overdischarge, deformation or corrosion, which has a great impact on the entire power system. There is an urgent need for a battery detection method to realize polymer lithium battery life. On-line monitoring of battery working status. [0003] At present, there are mainly the following type...
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IPC IPC(8): H01M10/48H01M10/42
CPCH01M10/42H01M10/486H01M10/488Y02E60/10
Inventor 李士强刘国强夏正武
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI