Power battery and vehicle

Abstract

The invention relates to the technical field of batteries, and discloses a power battery which comprises a battery cell and a battery box, the battery box is provided with an accommodating cavity, the battery box comprises a lower box body and an upper box body, the upper box body covers the lower box body, and the battery cell is fixed on the lower box body so as to be positioned in the accommodating cavity. A first pressure relief channel and a second pressure relief channel which are communicated with each other are arranged on the lower box body, the lower box body comprises a bottom plate and a side beam arranged in the circumferential direction of the bottom plate, the first pressure relief channel is arranged on the bottom plate, the second pressure relief channel is arranged in the side beam and can be communicated with the outside, the battery cell is arranged on the bottom plate, and the pressure relief valve is arranged towards the first pressure relief channel. When thermal runaway of the battery cell occurs, harmful substances can be directly sprayed into the first pressure relief channel and discharged out of the battery box through the second pressure relief channel, so that the spreading speed of thermal diffusion in the battery box is reduced, and the safety performance of the battery system is improved. The invention further discloses a vehicle which comprises the power battery, and harmful substances can be discharged in time when the battery cell is in thermal runaway.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a power battery and a vehicle. Background technique [0002] The power battery is the core component of the vehicle, but as the energy density of the battery cell in the battery system increases, the risk of thermal runaway of the battery cell increases. When the thermal runaway of the battery cell reaches a certain temperature, an uncontrollable state will appear , causing the temperature inside the battery system to rise sharply, causing combustion and explosion. [0003] Even though the vehicle usually installs a battery thermal management system to dissipate heat and cool down the battery cell, it cannot completely prevent the thermal runaway of the battery cell. After a local thermal runaway occurs in the battery cell, it will quickly spread to the entire battery system. The upper cover of the battery box usually adopts a lightweight design, or is made of plastic or thin-...

AI Technical Summary

Problems solved by technology

[0002] The power battery is the core component of the vehicle, but as the energy density of the battery cell in the battery system increases, the risk of thermal runaway of the battery cell increases. When the thermal runaway of the battery cell reaches a certain temperature, an uncontrollable state will appear , causing the temperature inside the battery system to rise sharply, causing combustion and explosion

[0003] Even if the vehicle is usually equipped with a battery thermal management system to dissipate heat and cool down the battery cell, it cannot completely prevent the thermal runaway of the battery cell. After the thermal runaway of the battery cell occurs locally, it will quickly spread to the entire battery system

The upper cover of the battery box usually adopts a lightweight design, or is made of plastic or thin-walled stamped metal, which reduces the high temperature resistance of the battery box cover toward the passenger compartment. Once thermal runaway occurs, toxic and high-temperature gas or flames will quickly Break through the shell of the battery box and spread to the crew compartment, reducing the survival chance of the crew members

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