Power battery module and power battery pack and thermal management method thereof

Abstract

The invention discloses a power battery module, a power battery pack and a heat management method thereof, the power battery module comprises a plurality of battery cell units, a plurality of heat pipe structures with ends embedded among the battery cell units, and liquid channels connected to the other ends, not embedded into the battery cell units, of the heat pipe structures, each battery cell unit comprises a positive current collector, a positive electrode material, a diaphragm, a negative electrode material and a negative current collector which are arranged in sequence; two sides of the heat pipe structure are tightly attached to the positive current collector or the negative current collector respectively; the two sides of the heat pipe structures are tightly attached to the current collectors of the battery cell units, so that the heat transfer resistance can be reduced, the heat dissipation / preheating speed can be greatly increased, the heat management effect of the power battery can be improved, and the heat exchange efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a power battery module, a power battery pack and a thermal management method thereof. Background technique [0002] Too high or too low temperature will seriously affect the life of lithium-ion power batteries, and may even lead to thermal runaway, causing battery thermal safety issues. Therefore, battery thermal management plays an important role in ensuring the thermal safety and performance of the battery system. [0003] The development trend of electric vehicle battery systems is to increase energy density, reduce charging time, and quickly start in low temperature environments. Among them, the improvement of energy density must be carried out from the perspective of single battery energy density and system integration. The non-modular technology integrates the cells directly into the battery pack, cancels the integration of the battery cell to the battery module l...

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Problems solved by technology

[0004] Another example is that the Chinese patent application publication number CN 105703036A discloses a battery pack heat pipe heat dissipation system, including a battery case, a battery module, and a heat pipe heat dissipation system; wherein, the battery module is placed inside the battery case; the heat pipe dissipates heat The system includes a heat conduction plate, a heat pipe and a finned tube; wherein, the heat conduction plate is arranged on the battery module; one end of the heat pipe is arranged in the heat conduction plate, and the other end passes through the battery case; the finned pipe is arranged on the other end of the heat pipe and It is installed on the outside of the battery case. It can be seen that this solution still uses the battery module as a unit to dissipate heat, but the heat inside the battery module cannot achieve effective heat dissipation, and the final heat dissipation efficiency is low.

In addition, the Chinese patent application publication No. CN 113036265 A discloses a battery module with a heat pipe, which seals around the cell unit and prevents a single cell unit from igniting and destroying other cell units and external copper bars. support structure, etc., to achieve a good effect of preventing thermal runaway, but its principle of suppressing thermal runaway is different from that of the present invention, and there is no effective explanation for heat dissipation in normal working conditions; moreover, the patent does not clearly define what it refers to. Cell unit, in fact, the cell unit of this patent is a battery cell, which is essentially different from the definition of the cell unit of the present invention, that is to say, this patent is still aimed at dissipating the heat emitted by the battery cell to the outside

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