Ternary battery pack safety structure with replacement device

Abstract

The invention discloses a ternary battery pack safety structure with a replacement device. The ternary battery pack safety structure comprises a battery tank and a gas replacement device, wherein the battery tank is connected with the gas replacement device; a battery pack is arranged in the battery tank; a plurality of single batteries are arranged in the battery pack; a shell of a sealing structure is arranged in the battery tank; a pressure release valve is arranged at the top of the shell; inflating valves are respectively arranged on two sides of the shell; the shell is full off a flame-retardant gas; the gas replacement device comprises a replacement gas generation unit, a discharged gas slow-store unit, a replacement controller, a gas inlet electromagnetic valve, a gas outlet electromagnetic valve and two gas conveying pipelines; the replacement gas generation unit is connected with the discharged gas slow-store unit; the gas inlet electromagnetic valve and the gas outlet electromagnetic valve are respectively arranged on the two gas conveying pipelines; two ends of the gas conveying pipeline with the gas inlet electromagnetic valve are respectively connected with one inflating valve and the replacement gas generation unit; two ends of the gas conveying pipeline with the gas outlet electromagnetic valve are respectively connected with the other inflating valve and the discharged gas slow-store unit.

Description

Technical field [0001] The invention relates to the technical field of ternary lithium batteries, in particular to a safety structure of a ternary battery pack provided with a replacement device. Background technique [0002] The safety performance of ternary lithium batteries is currently the most concerned issue in the power battery industry. Because of the advantages of good cycle performance and high energy density, ternary batteries are gradually being applied to new energy vehicles. However, in terms of safety performance of ternary material batteries, especially thermal runaway caused by overcharging and easy fire and explosion phenomenon in the needle test, they cannot pass the safety performance test, which limits their large-scale application in power batteries. In actual operation, due to vibration, collision and other reasons, it is likely to cause the ternary cell to puncture and leak. Due to the unstable high-temperature structure of the ternary material cell, the...

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Problems solved by technology

[0004] Although the aforementioned method has appropriately improved the safety performance of the ternary battery, it has the following disadvantages: material improvement can prevent the ternary battery from thermal runaway during overcharge and short-circuit tests, but the internal short circuit of the battery will still cause the battery to catch fire when puncture occurs; Functional electrolyte additives will reduce the rate performance and cycle performance of ternary batteries to a certain extent; external protective measures still have certain risks, such as adding insulating protective liquid to the battery box, which greatly increases the weight of the battery box, And the cost is high, because the thermal runaway caused by the battery material itself will intensify the decomposition of the electrolyte and the oxidation of the diaphragm. When the battery leaks the electrolyte, it will cause the pressure relief valve on the battery box to open, causing safety hazards

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