Top cover structure of power lithium ion battery

Abstract

The invention relates to a top cover structure of a power lithium ion battery. The top cover structure comprises a top cover plate, a liquid injection hole arranged on the top cover plate, an explosion-proof hole, a first electrode column and a second electrode column, wherein the first electrode column and the second electrode column respectively penetrate through the top cover plate and fixed onthe top cover plate, the first electrode column is electrically connected to the top cover plate, the second electrode column and the top cover plate form insulating connection, the second electrodecolumn is provided with an electrical connection sheet electrically connected to the second electrode column, the top cover plate is further provided with a temperature sensitive switch, the temperature sensitive switch is electrically connected to the top cover plate, the temperature sensitive switch is electrically connected to the electrical connection sheet when the temperature of the top cover plate is equal to or higher than a preset temperature, and the temperature sensitive switch and the electrical connection sheet form broken circuit assembly when the temperature of the top cover plate is lower than the preset temperature.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a top cover structure of a power lithium ion battery. Background technique [0002] With the development of the global economy, especially the development of the automobile industry, people consume more and more traditional energy, and the contradiction between energy supply and demand continues to escalate. People are eager to develop new clean energy to replace traditional energy to meet people's daily needs. The needs of life, while reducing environmental pollution. Driven by this demand, lithium-ion power batteries came into being. [0003] In modern society, lithium-ion batteries with high energy density are widely used in electric vehicles or energy storage power stations. In actual use, it is necessary to combine multiple lithium-ion batteries in series or The energy density, voltage, power density and other technical parameters of the group meet the needs of actual ...

AI Technical Summary

Problems solved by technology

[0004] In the actual application of the above-mentioned lithium-ion battery pack, due to the complex use environment, shaking, vibration, and drastic changes in the external environment temperature often occur, which will easily lead to the failure of the charge-discharge protection circuit set on each lithium-ion battery. At this time, if the When the lithium-ion battery pack is charged, because there is no protection of the charge-discharge protection circuit, it is easy to overcharge the lithium-ion battery in the battery pack, so that the electrolyte inside the lithium-ion battery decomposes and releases heat. At the same time, due to the electrolyte Decomposition, lithium ions are hindered from shuttling inside the battery, resulting in a significant increase in the internal resistance of the lithium-ion battery, resulting in a sharp rise in the temperature of the lithium-ion battery. At this time, if the charging of the lithium-ion battery is not stopped in time, the lithium-ion battery will The temperature continues to rise, and eventually thermal runaway occurs, causing the lithium-ion battery to explode and burn, which in turn induces thermal runaway of other lithium-ion batteries around it, eventually leading to serious consequences

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