A specific heat capacity testing method and device for a power battery
A power battery and testing method technology, applied in the field of power batteries, can solve problems such as inability to directly apply standard batteries, incompatibility of battery production processes, and heat loss that cannot be completely ignored, and achieve the effects of short measurement time, low cost, and easy operation
Active Publication Date: 2020-11-27
SHANGHAI UNIV OF ENG SCI
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Problems solved by technology
However, this temperature measurement method is not compatible with the current battery production process, and the internal temperature measurement can only be achieved for special pouch batteries
Since the method is an invasive measurement, it cannot be directly applied to standard batteries on the market
Furthermore, in this method, the electric heating wire is placed on the inner wall of the heat-insulating container and does not directly contact the surface of the battery, which inevitably leads to slow heat transfer from the electric heating wire to the battery, the heating time is still relatively long, and the heat loss is also increased. Insulation material is used for heat insulation, and its heat loss cannot be completely ignored
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[0046] The following is a detailed description of the embodiments of the present invention. This embodiment is carried out based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes.
[0047] This embodiment provides a specific heat capacity testing device for a power battery, where the film heater is attached to the power battery such as figure 1 , the temperature sensors are distributed as figure 2 , the schematic diagram of the test setup is shown in image 3 .
[0048] The power battery 1 can be a battery of various shapes, such as a square hard-shell battery, a soft-pack battery, and a cylindrical battery; this embodiment uses a square hard-shell power battery with a size of 130mm x 80mm x 18mm, and the film heater 2 is attached to the power battery 1 On the outer surface, the first temperature sensor 5 is evenly arranged on the outer surface of the power battery 1, and the second temperature ...
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The invention provides a testing method and device for specific heat capacity of a power battery. The method comprises the following steps: testing the specific heat capacity of the power battery by calibrating heat waste and heating and temperature equalization testing; acquiring a temperature-time changing curve of the power battery by calibrating the heat loss; keeping the constant temperatureof a cavity of a temperature control box unchanged, heating the power battery for a while with a film heater, then stopping heating, wherein the power battery is automatically dissipated and equalizedfor a preset time till the temperature of the battery power is uniform, and acquiring the average temperature rise; calculating the heat loss of the power battery according to the temperature-time changing curve; and calculating the specific heat capacity based on energy conservation. The specific heat capacity testing device of the power battery is simple, short in measuring time, accurate in testing result, low in cost and easy to operate, and can test the specific heat capacity of the power battery at different working condition temperatures.
Description
technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a specific heat capacity testing method and device of a power battery. Background technique [0002] Due to the advantages of high power density, long cycle life and convenient energy storage and conversion, power batteries mainly based on lithium-ion batteries are currently more and more used in the field of passenger vehicles. However, the power battery will generate a lot of heat during operation, and if it is not dissipated in time, it will easily lead to the decline of battery capacity and life, and even lead to thermal runaway. In order to improve the thermal safety and thermal reliability of the power battery, it is necessary to determine the thermal physical parameters of the battery to understand the thermal characteristics of the battery and perform thermal management on the power battery. Among them, the specific heat capacity is an important therm...
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IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 张恒运盛雷苏林徐屾黄波
Owner SHANGHAI UNIV OF ENG SCI