Device and method for testing internal thermal conductivity of energy storage system

Abstract

The invention discloses a testing method of the heat-transfer capability inside an energy storage system. The energy storage system comprises an energy storage element, a cooling element, and a heat-transfer element arranged between the energy storage element and the cooling element; the testing method comprises the following steps that the initial temperature of the heat-transfer element is measured; heating is conducted on the cooling element; the theoretical temperature range of the heat-transfer element is determined according to the initial temperature and heating condition of the heat-transfer element; the actual temperature of the heat-transfer element is measured; whether the measured actual temperature of the heat-transfer element falls in the theoretical temperature range of the heat-transfer element or not is determined, and therefore whether the heat-transfer capability inside the energy storage system meets the requirement or not is determined. By means of the testing device and method of the heat-transfer capability inside the energy storage system, heat-transfer capability detection inside the energy storage system can be rapidly completed; when the testing device and method of the heat-transfer capability inside the energy storage system are applied on a batched production line of lithium ion battery packs, on one hand, the production efficiency of the battery packs can not be affected; on the other hand, the product yield of a new energy vehicle energy storage system is increased.

Description

technical field [0001] The invention relates to a detection field, in particular to a testing device and method for the internal heat conduction capacity of a new energy vehicle energy storage system. Background technique [0002] The key energy storage device in the new energy vehicle energy storage system (Rechargeable Energy Storage System, referred to as RESS) is the vehicle power battery, and the mainstream of the vehicle power battery is lithium-ion battery. The suitable operating temperature range of lithium-ion battery packs is 10-30°C, while the operating temperature range of automotive power batteries varies greatly, generally -20-50°C, and the temperature range of automotive power batteries exceeds the suitable working temperature range of lithium-ion battery packs. temperature range. However, lithium-ion batteries are sensitive to the temperature of the working environment. Unsuitable working temperature is not conducive to the good performance of battery charac...

AI Technical Summary

Problems solved by technology

Among them, a is that there is an installation gap between the aluminum heat conduction plate and the water chamber, and there is no good contact; b and c are the two end faces of the aluminum heat conduction plate that should be perpendicular to each other are not vertical, resulting in an unsatisfactory surface contact state

In addition, in addition to the above three unsatisfactory surface-to-surface contact states, it is also possible that only some of the aluminum heat-conducting plates are in good contact with the water chamber due to the aluminum heat-conducting plate being in a laterally inclined state. This situation will also cause the aluminum heat-conducting plate to Uneven heating, resulting in uneven heating of battery cells

[0006] However, the current traditional thermal conductivity test method can only realize the thermal conductivity detection of the overall thermal conductivity of simple small-volume objects, but cannot be used for large-volume, high-weight and internal thermal conductivity tests such as energy storage systems of new energy vehicles. The DUT is tested, not to mention the rapid batch test of the internal thermal conductivity of the energy storage system

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