Temperature adjusting system for power lithium battery pack and power lithium battery pack

Abstract

The invention relates to a temperature adjusting system for a power lithium battery pack and the power lithium battery pack. The system comprises a battery box, phase-change energy-storage capsules and a plurality of heat pipes, wherein a plurality of lithium battery units are arranged in the battery box; the surfaces of all the lithium battery units are coated with thermal conductive coatings; the phase-change energy-storage capsules are filled into the battery box among the lithium battery units; the plurality of heat pipes are inserted among the lithium battery units; the circumferential wall of each heat pipe is in contact with the phase-change energy-storage capsules; and the two ends of each heat pipe are in tight contact with an upper cover and a bottom plate of the battery box respectively. A phase-change energy-storage material which has high heat-storage density and high chemical stability is integrated with a heat pipe technology, so that the heat-absorbing performance of the phase-change material can be brought into full play; the defects of low heat conductivity coefficient and low energy-storage rate of the phase-change material can be overcome; rapid response is available under the condition of high-power and large-current discharge of the power lithium battery pack; and the lithium battery pack is controlled to work safely in an optimal temperature range.

Description

Technical field [0001] The invention involves the temperature control technology of the power lithium battery pack. It is specifically a temperature adjustment system for the power lithium battery pack and the power lithium battery pack with a temperature regulation system.The phase -changing energy storage micro -capsule and thermal tube form a passive heat sink and temperature regulation system. Background technique [0002] Power lithium battery pack has high energy density, low environmental pollution, easy assembly, and low cost. It is called the future "heart" of electric vehicles.However, in actual work, the lithium -ion battery pack has chemical reaction heat and scorched ear heat, especially when the high -power and large current discharge, the temperature of the single battery is too high, which will cause the temperature in the battery module to be seriously uneven, causing the battery to make the batteryThe module fails prematurely due to heat out of control, and even...

AI Technical Summary

Problems solved by technology

[0003]Traditional heat management and control systems mainly use forced ventilation, water cooling and natural convection heat dissipation, all of which have certain application defects: forced ventilation and water cooling are active heat dissipation, such systems The structure is huge and complex due to the need for fans, pumps, pipelines and other accessories. In addition, air cooling will affect the sealing of the lithium battery module package, and the cost of water cooling is too high and requires corresponding insulation treatment. They also consume battery energy and reduce battery life. The actual power density and energy density are not suitable for electric bicycles and other small lithium battery power devices

However, due to the low thermal conductivity and low heat storage rate of phase change energy storage materials, when solving situations such as hot summer (>35°C), rapid and high-current discharge of batteries, or high-power work (acceleration, climbing, etc.), However, the thermal management and control system of a single phase change energy storage material still has the problems of insufficient heat dissipation and lagging temperature control

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