CN219123404U

CN219123404U - Battery pack structure with thermal safety and directional exhaust

Info

Publication number: CN219123404U
Application number: CN202223005946.6U
Authority: CN
Inventors: 刘峰; 陈保国; 于洋; 张京京
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2022-11-11
Filing date: 2022-11-11
Publication date: 2023-06-02
Anticipated expiration: 2032-11-11

Abstract

The utility model provides a battery pack structure with thermal safety and directional exhaust, which comprises an air guide cover and a smoke temperature sensor, wherein the air guide cover is covered on an explosion-proof valve of the battery pack, a guide plate is arranged in the air guide cover, an exhaust port is arranged at the bottom of the air guide cover, the opening direction of the exhaust port is downward, and the smoke temperature sensor is arranged on the air guide cover at the exhaust port. The utility model has the beneficial effects that: through the change of air guide cover to the exhaust route, by the change of exhausting to the side down exhaust, effectually avoided because the injury that high temperature gas and solid particle that thermal safety trouble produced the personnel that withdraw the vehicle, increase smog or temperature sensor on the exhaust route can make exhaust high temperature gas and solid particle direct flow to smog temperature sensor, the first time triggers the warning, can be timely, quick report fault information, reduced maintenance time and cost.

Description

Battery pack structure with thermal safety and directional exhaust

Technical Field

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack structure for thermal safety directional exhaust.

Background

At present, most of electric vehicle power batteries adopt lithium ion power batteries, and are generally formed by combining a plurality of electric cores in series-parallel connection. In the actual use process, due to external environmental influences, such as: battery aging, external impacts, high temperature weather, and the like can cause thermal runaway of the battery, which is typically initiated by one or more cells within the power battery.

When the lithium ion battery core is in thermal runaway, the cathode SEI film is decomposed, the anode active substance is decomposed and the electrolyte is decomposed by oxidization, so that a large amount of gas is generated, the gas expansion pressure in the lithium ion battery core is rapidly increased, the explosion is prevented by releasing pressure through an explosion-proof valve designed by the battery core when the pressure reaches a certain degree, and the temperature of the gas and solid particles sprayed through the explosion-proof valve is higher, and can reach about 1400 ℃ generally.

In general, the power battery can be provided with an explosion-proof valve structure on the shell wall of the shell, when the internal battery core is out of control, the chain reaction is prevented from being caused by the influence of high-temperature gas and solid particles on other battery cores, and an exhaust channel is reserved in the power battery and is used for discharging the high-temperature gas and the solid particles through the explosion-proof valve.

In the prior art, the explosion-proof valve device is generally arranged at the side surface or the rear surface of the power battery, when a thermal safety fault occurs, the discharge direction of high-temperature gas and solid can be parallel to the ground, and when the gas is evacuated, the gas and solid possibly cause injury to personnel.

At present, a smoke temperature sensor is generally arranged in a power battery, if the smoke temperature sensor fails, the smoke temperature sensor needs to be uncapped for maintenance, the maintenance difficulty is high, the maintenance time is long, and the maintenance cost is high.

Disclosure of Invention

In view of the above, the utility model aims to provide a battery pack structure with thermal safety and directional exhaust, which solves the problems of injury to evacuation personnel caused by high-temperature gas and solid particles exhausted in the prior art, long time and high cost in uncapping maintenance of a smoke temperature sensor.

In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:

the utility model provides a directional exhaust battery package structure of heat safety, includes air guide cover, smog temperature sensor, the air guide cover covers on battery package explosion-proof valve, the inside guide plate that is equipped with of air guide cover, the air guide cover bottom is equipped with the gas vent, and gas vent opening direction down, smog temperature sensor locates on the air guide cover of gas vent department.

Further, the battery pack structure for thermally safe directional exhaust further comprises a protection valve detachably connected to the exhaust port.

Further, the protection valve includes connecting portion and elasticity separation blade, the protection valve is made by the elasticity material, connecting portion and gas vent interference fit are connected, and the connecting portion lower extreme is equipped with the gas outlet, elasticity separation blade is equipped with a plurality ofly in gas outlet department, and the perpendicular projection part coincidence of two adjacent elasticity separation blades.

Further, the guide plate comprises a first guide plate and a second guide plate, wherein the first guide plate is used for guiding gas exhausted by the battery pack explosion-proof valve to the second guide plate, and the second guide plate is used for guiding the gas to the exhaust port.

Compared with the prior art, the battery pack structure for the thermal safety directional exhaust has the following advantages:

(1) According to the battery pack structure for the thermal safety directional exhaust, the exhaust path is changed through the air guide cover, the exhaust is changed into downward exhaust from lateral exhaust, the damage to people evacuating a vehicle caused by high-temperature gas and solid particles generated by thermal safety faults is effectively avoided, smoke or a temperature sensor is added to the exhaust path, the discharged high-temperature gas and solid particles can directly flow to the smoke temperature sensor, an alarm is triggered in the first time, fault information can be timely and rapidly reported, and maintenance time and cost are reduced.

(2) The protection valve provided by the utility model prevents the exhaust valve from being blocked due to the entry of external moisture and sundries under normal conditions, and improves the reliability of the device.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 is a schematic diagram of a battery pack with thermally safe and directional exhaust according to an embodiment of the present utility model;

fig. 2 is a schematic side view of an internal gas path of a thermally safe and directionally vented battery pack structure according to an embodiment of the present utility model.

Fig. 3 is a schematic front view of an internal gas path of a thermally safe and directionally vented battery pack structure according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of a protection valve according to an embodiment of the utility model.

Reference numerals illustrate:

1. an air guide cover; 2. an exhaust port; 3. a smoke temperature sensor; 4. installing a bolt; 5. a first deflector; 6. a second deflector; 7. an elastic baffle; 8. and a connecting part.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.

The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1-4, the battery pack structure for thermal safety directional exhaust comprises an air guide cover 1 and a smoke temperature sensor 3, wherein the air guide cover 1 is fixedly connected to a box body through a mounting bolt 4 and covers the whole explosion-proof valve, a first guide plate 5 and a second guide plate 6 are arranged in the air guide cover 1, an exhaust port 2 is arranged at the bottom of the air guide cover, the opening direction is vertically downward, the smoke temperature sensor 3 is arranged at the side of the exhaust port 2, and an inductor probe is arranged in the air guide cover 1.

The utility model provides a directional exhaust battery package structure of thermal security, still includes the protection valve, and the protection valve can dismantle the connection on gas vent 2, and the protection valve includes connecting portion 8 and elasticity separation blade 7, and the protection valve is made by elastic material, and connecting portion 8 is connected with gas vent 2 interference fit, and the connecting portion lower extreme is equipped with the gas outlet, and elasticity separation blade 7 is equipped with a plurality ofly in gas outlet department, and the perpendicular projection part coincidence of two adjacent elasticity separation blades. Under normal state, the protection valve makes the gas outlet be in the closed state through the overlap joint of a plurality of elasticity separation blade, makes guider 1 and external isolated, prevents that moisture or debris from getting into gas vent 2 and causing the jam, and when battery thermal runaway, explosion-proof valve pressure release exhaust, gas and solid particle utilize pressure to prop open a plurality of elasticity separation blade below the protection valve and make gas and solid particle discharge downwards.

The baffle includes first baffle 5 and second baffle 6, and first baffle 5 is used for guiding the gas of battery package explosion-proof valve exhaust to second baffle 6, and second baffle 6 is used for guiding gas to gas vent 2.

The working flow of the battery pack structure for the thermal safety directional exhaust is as follows:

under normal state, the gas guide cover 1 protection valve is closed state, when battery thermal runaway, explosion-proof valve pressure release exhaust, high temperature gas and solid particle are discharged to first guide plate 5 along the horizontal direction by the explosion-proof valve, first guide plate 5 guide gas path is along vertical direction to second guide plate 6, second guide plate 6 guide gas path is to the discharge port, gas activation smog temperature sensor 3, first time triggers the warning, report fault information, then the gas utilizes the pressure to prop open the protection valve, vertical downwardly discharge gas guide cover 1.

Claims

1. A thermally safe, directionally vented battery pack structure, characterized by: the gas guide cover is covered on the battery pack explosion-proof valve, a guide plate is arranged in the gas guide cover, an exhaust port is arranged at the bottom of the gas guide cover, the opening direction of the exhaust port faces downwards, and the smoke temperature sensor is arranged on the gas guide cover at the exhaust port.

2. The thermally safe, directionally degassing battery pack structure of claim 1, wherein: the air exhaust valve further comprises a protection valve which is detachably connected to the air exhaust port.

3. The thermally safe, directionally degassing battery pack structure of claim 2, wherein: the protection valve comprises a connecting part and elastic baffle plates, wherein the protection valve is made of elastic materials, the connecting part is connected with the exhaust port in interference fit, the lower end of the connecting part is provided with an air outlet, a plurality of elastic baffle plates are arranged at the air outlet, and the vertical projection parts of two adjacent elastic baffle plates are overlapped.

4. The thermally safe, directionally degassing battery pack structure of claim 1, wherein: the air guide plate comprises a first air guide plate and a second air guide plate, wherein the first air guide plate is used for guiding gas exhausted by the explosion-proof valve of the battery pack to the second air guide plate, and the second air guide plate is used for guiding the gas to the exhaust port.