New energy automobile battery pack thermal runaway flame retardant system

Abstract

The utility model discloses a new energy automobile battery pack thermal runaway flame retardant system, which comprises a shell, a battery module and a fire extinguishing medium generating unit, the battery module and the fire extinguishing medium generating unit are arranged in the shell, and the shell is further internally provided with a smoke sensor, a fire extinguishing medium generating unit and a fire extinguishing medium generating unit, when smoke is detected, the fire extinguishing medium generation unit is triggered through an electric signal; the lead assembly is arranged on the surface of the battery module, one end of the lead assembly extends into the fire extinguishing medium generation unit and is used for triggering the fire extinguishing medium generation unit after spontaneous combustion after high temperature detection. According to the mechanism, the state of the battery pack in the battery compartment can be accurately and rapidly detected, the fire extinguishing medium generation unit can be rapidly and accurately triggered when the individual internal state is abnormal, and the situation that the whole battery pack is deflagrated due to failure of part of battery cells is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pack management equipment, and specifically relates to a thermal runaway flame retardant system for a battery pack of a new energy vehicle. Background Art

[0002] As a clean energy alternative, lithium-ion batteries are safe, have a long cycle life, are non-toxic, and pollution-free. If the target voltage is higher, it needs to be achieved by connecting batteries in series. The safety of lithium batteries has always been a big problem. In industrial design, in order to ensure the safety of the battery pack, the battery management system provides protection against overcharge, over-discharge, overcurrent, and overheating. However, the internal short circuit of the battery is a probabilistic event that cannot be prevented and predicted. Although this is only a small probability event, the occurrence of an internal short circuit may lead to devastating consequences.

[0003] In order to obtain a high voltage platform, when multiple battery cells are connected in parallel, the traditional solution is generally to connect the total positive-total negative-total positive-total negative of the modules in close series, so as to obtain a battery pack with a large capacity and high voltage platform. Currently, the battery cells on the market are generally equipped with a pressure relief valve to release the gas generated in the battery during thermal runaway. Due to the close fit of the total positive and negative between the modules, when a battery cell has thermal runaway, the high temperature and high pressure generated will inevitably be transmitted to its adjacent modules, thereby greatly increasing the possibility of a chain reaction of thermal runaway of the battery cells in the adjacent modules.

[0004] If the thermal runaway of the battery cells inside the battery pack is not suppressed in time, it will easily spread to multiple surrounding battery cells until the entire battery pack explodes and affects other surrounding battery packs. Therefore, it is necessary to design a mechanism to suppress battery cell explosion for new energy vehicle battery packs. Utility Model Content

[0005] The purpose of the utility model is to provide a thermal runaway flame retardant system for a new energy vehicle battery pack for use, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a thermal runaway flame retardant system for a new energy vehicle battery pack, comprising a housing, a battery module and a fire extinguishing medium generating unit arranged inside the housing,

[0007] The housing is also provided with:

[0008] The smoke sensor is used to detect smoke inside the battery pack and trigger the fire extinguishing medium generating unit through an electrical signal when smoke is detected;

[0009] The lead assembly is arranged on the surface of the battery module, and one end of the lead assembly extends into the fire extinguishing medium generating unit, and is used to detect spontaneous combustion after high temperature and trigger the fire extinguishing medium generating unit.

[0010] Preferably, a BMS detection unit is provided in the battery pack, and the BMS detection unit is electrically connected to the fire extinguishing medium generating unit.

[0011] Preferably, the outer side of the battery module is wrapped with glue, and the lead assembly is arranged on the surface of the glue.

[0012] Preferably, the fire extinguishing medium generating unit is an aerosol fire extinguishing device.

[0013] Preferably, the number of the fire extinguishing medium generating units is not less than two.

[0014] The technical effects and advantages of the utility model are as follows: the thermal runaway flame retardant system of the battery pack of the new energy vehicle detects the instantaneous temperature of the battery cell through the lead assembly, detects the smoke concentration in the battery pack shell through the smoke sensor, and monitors the temperature rise and voltage and other data changes in real time through the BMS detection unit. Multiple detection schemes for the thermal runaway status of the battery cell are monitored simultaneously, and it can be discovered at an earlier stage whether the battery cell in the battery pack will experience thermal runaway, thereby preventing the entire battery pack from experiencing thermal runaway and causing explosion, minimizing the loss of the battery cell and the difficulty of flame retardancy due to thermal runaway, and the detection efficiency and flame retardant triggering accuracy are also higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a bottom view structural schematic diagram of the utility model;

[0016] Figure 2 It is a side structural schematic diagram of the utility model.

[0017] In the figure: 1. Shell; 2. Lead assembly; 3. Battery module; 4. Fire extinguishing medium generating unit; 5. Smoke sensor; 6. BMS detection unit. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The utility model provides Figure 1-2 A new energy vehicle battery pack thermal runaway flame retardant system is shown, comprising a shell 1, a battery module 3 and a fire extinguishing medium generating unit 4 arranged inside the shell 1, wherein the fire extinguishing medium generating unit 4 is an aerosol fire extinguishing device. The aerosol fire extinguishing device can be of the model QRRO.G / S-MC, which has a small size and fast triggering, and the aerosol release is fast and lasting. In addition, the number of the fire extinguishing medium generating units 4 is not less than two. It is ensured that the interior of the battery pack shell 1 is quickly filled after being triggered, and the internal air is squeezed out of the shell 1 to suppress the violent combustion that occurs after the internal battery cell fails.

[0022] A smoke sensor 5 is provided inside the housing 1; when the battery cell undergoes thermal runaway, relatively intense smoke will be generated before it burns, so detecting the smoke will often more quickly detect whether the battery cell is about to fail, thereby triggering the fire extinguishing medium generating unit 4 more timely, minimizing the loss and difficulty of fire suppression.

[0023] The surface of the battery module is also provided with a lead assembly 2, and one end of the lead assembly extends into the fire extinguishing medium generating unit 4, which is used to detect the high temperature and then spontaneously combust and trigger the fire extinguishing medium generating unit 4. The ignition assembly is a high-temperature spontaneous combustion lead. When the battery cell undergoes thermal runaway, a certain high temperature is generated. After being subjected to the high temperature, spontaneous combustion occurs and the flame is finally introduced into the fire extinguishing medium generating unit 4, triggering the fire extinguishing medium generating unit 4 to spray out the fire extinguishing medium such as aerosol, and at the same time, the internal air is squeezed out of the battery pack shell 1, thereby achieving the effect of suppressing the explosion of the battery pack.

[0024] A BMS detection unit 6 is disposed in the housing 1;

[0025] The BMS detection unit 6 is electrically connected to the fire extinguishing medium generating unit 4. It is used to detect the voltage and temperature values ​​of the battery cells in the battery pack. The BMS detection unit 6 monitors the temperature rise and voltage and other value changes of each battery cell in the battery pack in real time. When an abnormality is detected, the fire extinguishing medium generating unit 4 is directly triggered by electrical triggering to spray the fire extinguishing medium outward, thereby blocking the thermal runaway of the battery cell at a relatively earlier stage, making it more convenient to repair and recycle the battery cell, reducing costs and flame retardancy difficulty.

[0026] The battery module 3 is wrapped with glue outside, and the lead assembly 2 is arranged on the glue surface. The lead and the battery module 3 are isolated by the glue layer, ensuring that the lead assembly 2 will be triggered only when the battery cell breaks through the glue layer after thermal runaway occurs and releases heat, thereby avoiding the problem of the heat generated during normal operation of the battery cell accidentally triggering the lead assembly 2.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A thermal runaway flame retardant system for a new energy vehicle battery pack, comprising a housing (1), a battery module (3) and a fire extinguishing medium generating unit (4) arranged inside the housing (1), characterized in that: The housing (1) is further provided with: A smoke sensor (5) is used to detect smoke inside the housing (1) of the battery pack, and trigger the fire extinguishing medium generating unit (4) through an electrical signal when smoke is detected; as well as, The lead assembly (2) is arranged on the surface of the battery module, and one end of the lead assembly extends into the fire extinguishing medium generating unit (4), and is used to detect spontaneous combustion after high temperature and trigger the fire extinguishing medium generating unit (4).

2. A thermal runaway flame retardant system for a new energy vehicle battery pack according to claim 1, characterized in that: A BMS detection unit (6) is provided in the battery pack, and the BMS detection unit (6) is electrically connected to the fire extinguishing medium generating unit (4).

3. The thermal runaway flame retardant system for a new energy vehicle battery pack according to claim 1, characterized in that: The battery module (3) is wrapped with glue on its outer side, and the lead assembly (2) is arranged on the glue-filled surface.

4. A thermal runaway flame retardant system for a new energy vehicle battery pack according to claim 2, characterized in that: The fire extinguishing medium generating unit (4) is an aerosol fire extinguishing device.

5. A thermal runaway flame retardant system for a new energy vehicle battery pack according to claim 4, characterized in that: The number of the fire extinguishing medium generating units (4) is no less than two.

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