Method for verifying discharge of lithium ion battery and heat production of connecting piece of lithium ion battery

Abstract

The invention discloses a method for verifying discharge of a lithium ion battery and heat production of a connecting piece of the lithium ion battery. The method comprises the following steps of: placing the lithium ion battery in a constant-temperature and natural convection environment; carrying out charging and discharging tests on the lithium ion battery under different temperature conditions; collecting the temperature rise and cooling process data of an average temperature point position on the surface of the lithium ion battery; simulating and separating the chemical heat production of the battery and the internal resistance heat production of a resistor; converting the temperature rise data into a heat production rate of a battery cell body; and performing contact resistance test on a lithium ion battery tab and the connecting piece to obtain a contact resistance heat production rate of the lithium ion battery. According to the method, the heat production quantity of the battery and the battery connecting piece under the working condition is measured, the heat data is simulated, temperature distribution and heat production under different use conditions are calculated, battery heat management is achieved, and the consistency of the service life of the battery is guaranteed.

Description

technical field [0001] The invention relates to the technical field of heat generation of lithium-ion batteries, in particular to a method for verifying heat generation of lithium-ion battery discharge and its connectors. Background technique [0002] Lithium-ion batteries appeared in the early 1990s. In just two decades, lithium-ion battery technology has achieved unprecedented development. At present, the performance of lithium-ion batteries is better than that of lead-acid batteries and nickel-metal hydride batteries in terms of specific energy, specific power, working voltage and service life, and has gradually become the development direction of power batteries. With the improvement of the safety performance and low-temperature discharge performance of lithium-ion batteries, there are more and more electric vehicles powered by lithium-ion power batteries, showing a very broad application prospect. However, as a chemical power source, lithium-ion batteries are accompani...

AI Technical Summary

Problems solved by technology

The above technical solution only analyzes the heat production of the battery itself, and does not take into account that in addition to the heat production of the battery body during battery discharge, a suitable external tab connection method of the battery can reduce the temperature rise of the battery rate discharge.

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