CN112234310B - Battery pack thermal runaway processing device and battery pack thermal runaway processing method - Google Patents

Battery pack thermal runaway processing device and battery pack thermal runaway processing method Download PDF

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Publication number
CN112234310B
CN112234310B CN202010477798.4A CN202010477798A CN112234310B CN 112234310 B CN112234310 B CN 112234310B CN 202010477798 A CN202010477798 A CN 202010477798A CN 112234310 B CN112234310 B CN 112234310B
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concentration
battery pack
preset
value
thermal runaway
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CN112234310A (en
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杨卫坤
段晋杰
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Svolt Energy Technology Co Ltd
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Svolt Energy Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The invention relates to the technical field of batteries, and discloses a battery pack thermal runaway processing device and a battery pack thermal runaway processing method. The battery pack thermal runaway processing device can remove hydrofluoric acid in harmful gas generated by thermal runaway of the battery pack.

Description

Battery pack thermal runaway processing device and battery pack thermal runaway processing method
Technical Field
The invention relates to the technical field of batteries, in particular to a battery pack thermal runaway processing device and a battery pack thermal runaway processing method.
Background
The modern automobile industry is revolutionarily changing, that is, the traditional fuel automobile is gradually replaced by a new energy automobile, wherein a pure electric automobile is favored as one of the new energy automobiles, and a battery pack is increasingly researched as a main component of the electric automobile. The power battery pack can discharge gas containing harmful substances such as hydrofluoric acid after thermal runaway, and air pollution can be caused if the gas containing the harmful substances is directly discharged.
Disclosure of Invention
The invention aims to provide a battery pack thermal runaway processing device which can remove hydrofluoric acid in harmful gas generated by thermal runaway of a battery pack.
In order to achieve the above object, an aspect of the present invention provides a thermal runaway processing device for a battery pack, including an exhaust pipe disposed at an explosion-proof valve of the battery pack, the exhaust pipe being capable of guiding out harmful gas exhausted after the explosion-proof valve is opened when the battery pack is in thermal runaway, and a first purification unit disposed in the exhaust pipe, the first purification unit being configured to be capable of removing hydrofluoric acid in the harmful gas.
Above-mentioned technical scheme is through setting up first purification unit on the blast pipe way to can get rid of the hydrofluoric acid among the harmful gas that produces when the battery package thermal runaway, reduce environmental pollution from this.
Preferably, the first purification unit includes a first installation body disposed in the exhaust pipe, the first installation body is provided with a first via hole for the harmful gas to pass through, and the first installation body is provided with a metal oxide capable of reacting with hydrofluoric acid in the harmful gas to remove the hydrofluoric acid.
Preferably, the battery pack thermal runaway processing device comprises a filter screen arranged in the exhaust pipeline, the filter screen is arranged on the upstream of the first mounting body along the exhaust direction of the harmful gas, and the filter screen can filter solid particles in the harmful gas.
Preferably, the battery pack thermal runaway processing device includes a second purification unit, the second purification unit includes a second installation body disposed in the exhaust pipeline and located downstream of the first installation body in the exhaust direction of the harmful gas, the second installation body is provided with a second through hole through which the harmful gas passes, and the second installation body is provided with a catalyst capable of promoting carbon monoxide in the harmful gas to react with oxygen to generate carbon dioxide.
Preferably, the thermal runaway processing device for the battery pack comprises an exhaust gas pipeline communicated with the exhaust pipeline and used for collecting exhaust gas, and the thermal runaway processing device for the battery pack comprises a control valve arranged at the outlet end of the exhaust pipeline, wherein the control valve can control the communication state of the exhaust pipeline and the exhaust gas pipeline.
Preferably, the thermal runaway processing device for the battery pack comprises a first smoke sensor and a gas sensor, wherein the first smoke sensor and the gas sensor are arranged in the exhaust pipeline and close to the inlet end of the exhaust pipeline, the first smoke sensor can detect a first concentration of solid particles in the exhaust pipeline, and the gas sensor can detect a second concentration of a predetermined gas in the harmful gas;
the battery pack thermal runaway processing device comprises a pressure sensor and a second smoke sensor, wherein the pressure sensor is arranged in the battery pack and can detect the pressure in the battery pack, the second smoke sensor can detect the third concentration of solid particles in the battery pack, and the battery pack is provided with a temperature sensor which can detect the temperature of an electric core in the battery pack;
a vehicle control unit is arranged outside the battery pack, the first smoke sensor, the gas sensor and the control valve are all connected with the vehicle control unit, a battery management system is arranged in the battery pack, and the vehicle control unit, the pressure sensor, the second smoke sensor and the temperature sensor are all connected with the battery management system;
the battery management system is arranged to send information to the vehicle control unit when the detected pressure is greater than or equal to a preset pressure value, the detected third concentration is greater than or equal to a preset third concentration value and the detected temperature deviates from a preset temperature range value, the vehicle control unit judges the concentration condition in the exhaust pipeline based on the information, and the control valve is controlled to be in an open state when the first concentration is greater than or equal to a preset first concentration value or the second concentration is greater than or equal to a preset second concentration value.
Preferably, the control valve is in a closed state when:
the battery management system is arranged to be capable of sending information to the vehicle control unit when the detected pressure is greater than or equal to a preset pressure value, the detected third concentration is less than the third concentration preset value and the detected temperature meets a preset temperature range value, the vehicle control unit judges the concentration condition in the exhaust pipeline based on the information, and controls the control valve to be in a closed state when the first concentration is less than the first concentration preset value;
the battery management system is arranged to be capable of sending information to the vehicle control unit when the detected pressure is smaller than a preset pressure value, the detected third concentration is smaller than a third concentration preset value and the detected temperature meets a preset temperature range value, the vehicle control unit judges the concentration condition in the exhaust pipeline based on the information, and controls the control valve to be in a closed state when the first concentration is larger than or equal to a first concentration preset value or the second concentration is larger than or equal to a second concentration preset value;
the battery management system is arranged to send information to the vehicle control unit when the detected temperature deviates from a preset temperature range value and the detected third concentration is smaller than a third concentration preset value, the vehicle control unit judges the concentration condition in the exhaust pipeline based on the information, and the control valve is controlled to be in a closed state when the first concentration is smaller than the first concentration preset value;
the battery management system is configured to send information to the vehicle control unit when the detected temperature is in accordance with a preset temperature range value, the detected pressure is smaller than a preset pressure value, and the detected third concentration is greater than or equal to a third concentration preset value, the vehicle control unit judges the concentration condition in the exhaust pipeline based on the information, and controls the control valve to be in a closed state when the first concentration is smaller than a first concentration preset value and the second concentration is smaller than a second concentration preset value.
The second aspect of the invention provides a thermal runaway treatment method for a battery pack, which comprises the following steps:
step S20: receiving harmful gas discharged when the battery pack is out of thermal runaway;
step S22: purifying the harmful gas: and removing hydrofluoric acid in the harmful gas.
Preferably, in the step S22, the purifying the harmful gas includes the steps of:
step S24: removing carbon monoxide in the harmful gas; and/or
Step S26: and removing solid particles in the harmful gas.
Preferably, the battery pack thermal runaway treatment method comprises the following steps:
step S40 a: in the process of performing step S20, when it is detected that the pressure in the battery pack is greater than or equal to a preset pressure value, the concentration of the solid particles in the battery pack is greater than or equal to a third preset concentration value, and the temperature of the battery cell deviates from a preset temperature range value, and it is detected that the concentration of the solid particles of the received harmful gas is greater than or equal to a first preset concentration value, the purified gas is discharged; or
Step S40 b: in the process of performing step S20, when the detected pressure in the battery pack is greater than or equal to a preset pressure value, the detected concentration of the solid particles in the battery pack is greater than or equal to a third preset concentration value, and the detected temperature of the battery cell deviates from a preset temperature range value, and the concentration of the predetermined gas in the received harmful gas is detected to be greater than or equal to a second preset concentration value, the purified gas is discharged.
Drawings
Fig. 1 is a schematic structural view of a thermal runaway processing device for a battery pack according to a preferred embodiment of the invention applied to the battery pack;
fig. 2 is a schematic structural view of a thermal runaway processing device for a battery pack according to another preferred embodiment of the invention, in which only an exhaust line in the thermal runaway processing device is shown;
fig. 3 is a partial structure enlarged view of the structure shown in fig. 2.
Description of the reference numerals
10-battery pack thermal runaway processing device; 11-exhaust line; 12-an exhaust line; 13-a control valve; 14-a first purification unit; 140-a first mounting body; 15 a-vehicle control unit; 15 b-a battery management system; 16-a filter screen; 17 a-a first smoke sensor; 17 b-a second smoke sensor; 17 c-a pressure sensor; 17 d-gas sensor; 18-a second purification unit; 180-a second mounting body; 19-a fire extinguishing mechanism; 20-a battery pack; 22-explosion-proof valve.
Detailed Description
In the present invention, the use of directional terms such as "upper, lower, left and right" in the absence of a contrary explanation generally means that the directions shown in the drawings and the practical application are considered to be the same, and "inner and outer" mean the inner and outer of the outline of the component.
It should be noted that the battery pack 20 includes a battery pack case and a battery module disposed in the battery pack case, the battery module is provided with a temperature sensor for detecting the temperature of the battery core, and in addition, the battery pack case is provided with an explosion-proof hole, and the explosion-proof hole can be provided with an explosion-proof valve. In addition, a Battery Management System (BMS) and a Battery distribution box are provided in the Battery pack 20, and a Vehicle Control Unit (VCU) is provided in the Vehicle.
The invention provides a thermal runaway processing device for a battery pack, and as shown in a combination of fig. 2 and fig. 3, the thermal runaway processing device 10 for the battery pack comprises an exhaust pipeline 12 arranged at an anti-explosion valve 22 of the battery pack 20, wherein the exhaust pipeline 12 can lead out harmful gas exhausted after the anti-explosion valve 22 is opened when the battery pack 20 is in thermal runaway, as shown in fig. 1, the thermal runaway processing device 10 for the battery pack further comprises a first purification unit 14 arranged in the exhaust pipeline 12, and the first purification unit 14 is arranged to remove hydrofluoric acid in the harmful gas. By providing the first purification unit 14 on the exhaust line 12, hydrofluoric acid in harmful gas generated when the battery pack 20 is thermally runaway can be removed, thereby reducing environmental pollution.
The first purifying unit 14 may include a first installation body 140 disposed in the exhaust duct 12, the first installation body 140 may be horizontally disposed in the exhaust duct 12, a first via hole through which the harmful gas passes may be disposed on the first installation body 140, a plurality of first via holes may be disposed on the first installation body 140 to facilitate the passage of the harmful gas, the plurality of first via holes may be uniformly distributed, and a metal oxide such as calcium oxide that can react with hydrofluoric acid in the harmful gas to remove the hydrofluoric acid may be disposed on the first installation body 140. When the harmful gas passes through the first installation body 140, hydrofluoric acid in the harmful gas can react with a metal oxide such as calcium oxide provided to the first installation body 140, whereby hydrofluoric acid in the harmful gas can be removed.
In addition, a filter screen 16 may be disposed in the exhaust duct 12, and the filter screen 16 may filter solid particles in the harmful gas, thereby further reducing environmental pollution. Preferably, filter screen 16 may be disposed upstream of first mounting body 140 in the discharge direction of the harmful gas, wherein filter screen 16 may be disposed horizontally in exhaust duct 12.
In order to further reduce the pollution to the environment, a second purification unit 18 may be disposed in the exhaust pipe 12, the second purification unit 18 may include a second installation body 180 disposed in the exhaust pipe 12 and located downstream of the first installation body 140 in the discharge direction of the harmful gas, a second through hole through which the harmful gas passes may be disposed on the second installation body 180, a plurality of second through holes may be disposed on the second installation body 180, the plurality of second through holes may be uniformly distributed, and a catalyst capable of promoting the carbon monoxide in the harmful gas to react with oxygen to generate carbon dioxide may be disposed on the second installation body 180. When the harmful gas passes through the second installation body 180, carbon monoxide in the harmful gas and oxygen such as oxygen in the air react to generate carbon dioxide under the acceleration of a catalyst provided to the second installation body 180, whereby carbon monoxide in the harmful gas can be removed. Among these, catalysts are well known to those skilled in the art and will not be described in detail herein.
The battery pack thermal runaway processing apparatus 10 may include an exhaust gas line 11 communicating with the exhaust line 12 for collecting exhaust gas, so that the gas exhausted from the exhaust line 12 may be collected by the exhaust gas line 11, and in order to facilitate control of the discharge of the gas in the exhaust line 12 and to prevent the exhaust gas in the exhaust line 11 from easily flowing into the exhaust line 12, a control valve 13 may be provided at an outlet end of the exhaust line 12, and the control valve 13 may be provided to be able to control a communication state of the exhaust line 12 with the exhaust gas line 11. It should be noted that when the thermal runaway of the battery pack 20 occurs and a large amount of gas is generated, the control valve 13 may be in an open state. When the battery pack 20 provided with the battery pack thermal runaway processing device 10 is applied to a vehicle, the exhaust gas pipeline 11 may be a whole vehicle exhaust gas pipeline.
It is to be noted that the end of the exhaust line 12 close to the explosion-proof valve 22 is an inlet end, and the end of the exhaust line 11 of the exhaust line 12 is an outlet end.
As shown in fig. 1, a first smoke sensor 17a and a gas sensor 17d may be provided in the exhaust line 12 near the inlet end of the exhaust line 12, specifically, both the first smoke sensor 17a and the gas sensor 17d may be provided upstream of the filter screen 16 in the discharge direction of the harmful gas, and before the harmful gas is not purified, an accurate judgment is made to control the operating state of the control valve 13, i.e., whether it is open, wherein: the first smoke sensor 17a is able to detect a first concentration of solid particles in the exhaust line 12 and the gas sensor 17d is able to detect a second concentration of a predetermined gas, i.e. a certain gas, such as carbon monoxide, in said noxious gases.
A pressure sensor 17c capable of detecting the pressure inside the battery pack 20 and a second smoke sensor 17b capable of detecting the third concentration of the solid particles inside the battery pack 20 may be provided inside the battery pack 20, and further, the battery pack 20 has a temperature sensor capable of detecting the temperature of the battery cells inside the battery pack 20, and the temperature information of the battery cells may be acquired using the temperature sensor.
The exterior of the battery pack 20 may be provided with a vehicle control unit 15a, the first smoke sensor 17a, the gas sensor 17d and the control valve 13 are all connected with the vehicle control unit 15a, the battery pack 20 may be provided therein with a battery management system 15b, and the vehicle control unit 15a, the pressure sensor 17c, the second smoke sensor 17b and the temperature sensor are all connected with the battery management system 15 b.
The battery management system 15b is configured to send information to the vehicle control unit 15a when the detected pressure is greater than or equal to a preset pressure value, the detected third concentration is greater than or equal to a preset third concentration value, and the detected temperature deviates from a preset temperature range value, that is, the temperature is not within a preset temperature range value, that is, an abnormal state of temperature occurs, and the vehicle control unit 15a determines the concentration condition in the exhaust pipe 12 based on the information, and controls the control valve 13 to be in the open state when the first concentration is greater than or equal to a first concentration preset value or the second concentration is greater than or equal to a second concentration preset value. The temperature deviation from the preset temperature range value can be understood as a temperature abnormal state generated by temperature change, for example, the current temperature change can cause the temperature to rise above a preset maximum value so as to cause the temperature to be abnormal, the temperature rising rate is fast so as to cause the temperature to deviate from the preset temperature range value so as to cause the temperature to be abnormal, for example, the temperature rising rate can last for more than 3s, wherein the temperature rising rate, namely the temperature rising rate when the temperature rising rate is delta T/delta s is more than or equal to 1 ℃/s, can be regarded as a higher temperature rising rate. Thereby, the control valve 13 can be accurately controlled according to the conditions inside the battery pack 20 and the conditions in the exhaust line 12.
In addition, a fire extinguishing mechanism 19 connected to the battery management system 15b may be provided in the battery pack 20, and for example, a plurality of, e.g., four fire extinguishing mechanisms 19 may be provided. The vehicle control unit 15a is configured to send a message to the battery management system 15b when the detected first concentration is greater than or equal to a first concentration preset value or the detected second concentration is greater than or equal to a second concentration preset value; the battery management system 15b determines the condition inside the battery pack 20 based on this information, and controls the fire extinguishing mechanism 19 to be in an open state when the detected pressure is equal to or higher than a preset pressure value, the detected third concentration is equal to or higher than a preset third concentration value, and the detected temperature deviates from a preset temperature range value. Meanwhile, the battery management system 15b may control the battery distribution box to disconnect the high voltage, and the vehicle control unit 15a may issue an alarm message that the vehicle passenger gets off.
In addition, the control valve 13 may be in a closed state when the following occurs.
The battery management system 15b may be configured to send information to the vehicle control unit 15a when the detected pressure is greater than or equal to a preset pressure value, the detected third concentration is less than the third concentration preset value, and the detected temperature is within a preset temperature range value, the vehicle control unit 15a may determine a concentration condition in the exhaust pipe 12 based on the information, control the control valve 13 to be in a closed state when the first concentration is less than the first concentration preset value, and at the same time, the vehicle control unit 15a may send a signal indicating that the maintenance and troubleshooting are abnormal.
The battery management system 15b may be configured to send a message to the vehicle control unit 15a when the detected pressure is smaller than the preset pressure value, the detected third concentration is smaller than the preset third concentration value, and the detected temperature is in line with or does not deviate from the preset temperature range value, the vehicle control unit 15a may determine the concentration condition in the exhaust pipe 12 based on the message, and control the control valve 13 to be in the closed state when the first concentration is greater than or equal to the preset first concentration value or when the second concentration is greater than or equal to the preset second concentration value, and at the same time, the vehicle control unit 15a may send a signal indicating that the maintenance and inspection are abnormal.
The battery management system 15b may be configured to send a message to the vehicle control unit 15a when the detected temperature deviates from the preset temperature range value and the detected third concentration is lower than the third concentration preset value, the vehicle control unit 15a may determine the concentration condition in the exhaust pipe 12 based on the message, control the control valve 13 to be in a closed state when the first concentration is lower than the first concentration preset value, and at the same time, the vehicle control unit 15a may send a signal that the passenger gets off the vehicle and gets away from the vehicle. The temperature deviation is described in the foregoing, and is not described herein again.
The battery management system 15b may be configured to send information to the vehicle controller 15a when the detected temperature is within a preset temperature range, the detected pressure is less than a preset pressure value, and the detected third concentration is greater than or equal to the third concentration preset value, the vehicle controller 15a may determine a concentration condition in the exhaust pipe 12 based on the information, control the control valve 13 to be in a closed state when the first concentration is less than the first concentration preset value and the second concentration is less than the second concentration preset value, and at the same time, the vehicle controller 15a may send a signal that a passenger gets off the vehicle.
The invention also provides a battery pack thermal runaway processing method, which comprises the following steps: step S20: receiving harmful gas discharged when the battery pack 20 is thermally out of control; step S22: purifying the harmful gas: and removing hydrofluoric acid in the harmful gas. Preferably, the battery pack thermal runaway processing method can be realized by using the battery pack thermal runaway processing device 10 provided by the invention.
In addition, in the step S22, the purifying the harmful gas may include the steps of: step S24: the carbon monoxide in the harmful gas is removed, for example, the carbon monoxide in the harmful gas may be removed after the hydrofluoric acid is removed. In addition, the step of purifying the harmful gas may include: step S26: the solid particles in the harmful gas are removed, for example, the solid particles in the harmful gas may be removed before the hydrofluoric acid is removed. The preferred methods for removing hydrofluoric acid, removing carbon monoxide and removing solid particles are described in the foregoing, and are not described herein again. Of course, the removal can be performed in other manners, and the removal can be selected according to the requirement without any particular limitation.
In addition, in order to prevent external exhaust gas, such as exhaust gas in the exhaust gas line of the entire vehicle, from entering the exhaust gas line 12, the thermal runaway processing method for the battery pack may include the steps of:
step S40 a: in the process of performing step S20, that is, when receiving the harmful gas exhausted when the battery pack is out of thermal runaway, when detecting that the pressure in the battery pack 20 is greater than or equal to the preset pressure value, the concentration of the solid particles in the battery pack 20 is greater than or equal to the third preset concentration value, and the temperature of the battery cell deviates from the preset temperature range value, and detecting that the concentration of the solid particles of the received harmful gas is greater than or equal to the first preset concentration value, the purified gas is exhausted.
Step S40 b: in the process of performing step S20, that is, when receiving the harmful gas exhausted when the battery pack is out of thermal runaway, when detecting that the pressure in the battery pack 20 is greater than or equal to the preset pressure value, the concentration of the solid particles in the battery pack 20 is greater than or equal to the third preset concentration value, and the temperature of the battery cell deviates from the preset temperature range value, and detecting that the concentration of the predetermined gas, such as carbon monoxide, in the received harmful gas is greater than or equal to the second preset concentration value, the purified gas is exhausted.
In addition, the thermal runaway treatment method for the battery pack can comprise the following steps of:
step S60 a: in the process of performing step S20, when it is detected that the pressure in the battery pack 20 is greater than or equal to the preset pressure value, the concentration of the solid particles in the battery pack 20 is smaller than the third preset concentration value, and the detected temperature of the battery cell meets the preset temperature range value, and it is detected that the concentration of the solid particles in the received harmful gas is smaller than the first preset concentration value, it is not necessary to discharge the gas to the outside.
Step S60 b: in the process of performing step S20, when it is detected that the pressure in the battery pack 20 is lower than the preset pressure value, the concentration of the solid particles in the battery pack 20 is lower than the third preset concentration value, and the detected temperature of the battery cell meets the preset temperature range value, and it is detected that the concentration of the solid particles in the received harmful gas is greater than or equal to the first preset concentration value or the concentration of the predetermined gas is greater than or equal to the second preset concentration value, it is not necessary to discharge the gas to the outside.
Step S60 c: in the process of performing step S20, when it is detected that the temperature of the battery cell deviates from the preset temperature range value and the concentration of the solid particles in the battery pack is smaller than the third concentration preset value, and it is detected that the concentration of the solid particles in the received harmful gas is smaller than the first concentration preset value, it is not necessary to discharge the gas to the outside.
Step S60 d: in the process of performing step S20, when it is detected that the temperature of the battery cell meets the preset temperature range value, the pressure in the battery pack 20 is smaller than the preset pressure value, and the concentration of the solid particles in the battery pack is greater than or equal to the third concentration preset value, and it is detected that the concentration of the solid particles in the received harmful gas is smaller than the first concentration preset value and the concentration of the predetermined gas is smaller than the second concentration preset value, it is not necessary to discharge the gas to the outside.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (7)

1. A thermal runaway processing device for a battery pack, characterized in that the thermal runaway processing device (10) for the battery pack comprises an exhaust pipeline (12) arranged at an explosion-proof valve (22) of the battery pack (20), the exhaust pipeline (12) can lead out harmful gas exhausted after the explosion-proof valve (22) is opened when the battery pack (20) is thermally runaway, the thermal runaway processing device (10) for the battery pack further comprises a first purification unit (14) arranged in the exhaust pipeline (12), and the first purification unit (14) is arranged to remove hydrofluoric acid in the harmful gas;
the battery pack thermal runaway processing device (10) comprises an exhaust gas pipeline (11) communicated with the exhaust pipeline (12) and used for collecting exhaust gas, the battery pack thermal runaway processing device (10) comprises a control valve (13) arranged at the outlet end of the exhaust pipeline (12), and the control valve (13) can control the communication state of the exhaust pipeline (12) and the exhaust gas pipeline (11);
the thermal runaway processing device (10) for a battery pack comprises a first smoke sensor (17a) and a gas sensor (17d) which are arranged in the exhaust pipeline (12) and close to the inlet end of the exhaust pipeline (12), wherein the first smoke sensor (17a) can detect a first concentration of solid particles in the exhaust pipeline (12), and the gas sensor (17d) can detect a second concentration of a predetermined gas in the harmful gas;
the battery pack thermal runaway processing device (10) comprises a pressure sensor (17c) which is arranged in the battery pack (20) and can detect the pressure in the battery pack (20), and a second smoke sensor (17b) which can detect a third concentration of solid particles in the battery pack (20), wherein the battery pack (20) is provided with a temperature sensor which can detect the temperature of a battery core in the battery pack (20);
a vehicle control unit (15a) is arranged outside the battery pack (20), the first smoke sensor (17a), the gas sensor (17d) and the control valve (13) are all connected with the vehicle control unit (15a), a battery management system (15b) is arranged in the battery pack (20), and the vehicle control unit (15a), the pressure sensor (17c), the second smoke sensor (17b) and the temperature sensor are all connected with the battery management system (15 b); wherein:
the battery management system (15b) is configured to send information to the vehicle control unit (15a) when the detected pressure is greater than or equal to a preset pressure value, the detected third concentration is greater than or equal to a third concentration preset value and the detected temperature deviates from a preset temperature range value, the vehicle control unit (15a) judges the concentration condition in the exhaust pipeline (12) based on the information, and controls the control valve (13) to be in an open state when the first concentration is greater than or equal to a first concentration preset value or the second concentration is greater than or equal to a second concentration preset value.
2. The battery pack thermal runaway processing device according to claim 1, wherein the first purification unit (14) comprises a first mounting body (140) disposed in the exhaust duct (12), a first through hole for the harmful gas to pass through is disposed on the first mounting body (140), and a metal oxide capable of reacting with hydrofluoric acid in the harmful gas to remove hydrofluoric acid is disposed on the first mounting body (140).
3. The battery pack thermal runaway processing device according to claim 2, characterised in that the battery pack thermal runaway processing device (10) comprises a filter screen (16) provided in the exhaust duct (12), the filter screen (16) being provided upstream of the first mounting body (140) in the exhaust direction of the harmful gas, the filter screen (16) being capable of filtering out solid particles in the harmful gas.
4. The battery pack thermal runaway processing device according to claim 3, wherein the battery pack thermal runaway processing device (10) comprises a second purification unit (18), the second purification unit (18) comprises a second installation body (180) arranged in the exhaust pipeline (12) and located downstream of the first installation body (140) in the exhaust direction of the harmful gas, a second through hole for the harmful gas to pass through is formed in the second installation body (180), and a catalyst capable of promoting carbon monoxide in the harmful gas to react with oxygen to generate carbon dioxide is arranged on the second installation body (180).
5. The thermal runaway processing device for a battery pack according to claim 1, characterised in that the control valve (13) is in a closed state when:
the battery management system (15b) is arranged to send information to the vehicle control unit (15a) when the detected pressure is greater than or equal to a preset pressure value, the detected third concentration is less than the third concentration preset value and the detected temperature conforms to a preset temperature range value, the vehicle control unit (15a) judges the concentration condition in the exhaust pipeline (12) based on the information, and controls the control valve (13) to be in a closed state when the first concentration is less than the first concentration preset value;
the battery management system (15b) is configured to send information to the vehicle control unit (15a) when the detected pressure is smaller than a preset pressure value, the detected third concentration is smaller than a preset third concentration value, and the detected temperature conforms to a preset temperature range value, the vehicle control unit (15a) determines the concentration condition in the exhaust pipeline (12) based on the information, and controls the control valve (13) to be in a closed state when the first concentration is greater than or equal to a preset first concentration value or when the second concentration is greater than or equal to a preset second concentration value;
the battery management system (15b) is arranged to be able to send information to the vehicle control unit (15a) when a temperature deviation from a preset temperature range value is detected and the detected third concentration is less than the third concentration preset value, the vehicle control unit (15a) based on the information and determining a concentration condition in the exhaust line (12), and controlling the control valve (13) to be in a closed state when the first concentration is less than the first concentration preset value;
the battery management system (15b) is configured to send a message to the vehicle control unit (15a) when the detected temperature is in accordance with a preset temperature range value, the detected pressure is less than a preset pressure value, and the detected third concentration is greater than or equal to a third concentration preset value, the vehicle control unit (15a) judges the concentration condition in the exhaust pipeline (12) based on the message, and controls the control valve (13) to be in a closed state when the first concentration is less than a first concentration preset value and when the second concentration is less than a second concentration preset value.
6. A thermal runaway processing method for a battery pack is characterized by comprising the following steps:
step S20: receiving harmful gas discharged when the battery pack is out of thermal runaway;
step S22: purifying the harmful gas: removing hydrofluoric acid in the harmful gas;
the thermal runaway treatment method for the battery pack further comprises the following steps of:
step S40 a: in the process of performing step S20, when it is detected that the pressure in the battery pack is greater than or equal to a preset pressure value, the detected concentration of the solid particles in the battery pack is greater than or equal to a third preset concentration value, and the detected temperature of the battery cell deviates from a preset temperature range value, and it is detected that the concentration of the solid particles of the received harmful gas is greater than or equal to a first preset concentration value, the purified gas is discharged; or
Step S40 b: in the process of performing step S20, when it is detected that the pressure in the battery pack is greater than or equal to a preset pressure value, the concentration of the solid particles in the battery pack is greater than or equal to a third preset concentration value, and the temperature of the battery cell deviates from a preset temperature range value, and it is detected that the concentration of the predetermined gas in the received harmful gas is greater than or equal to a second preset concentration value, the purified gas is discharged.
7. The battery pack thermal runaway processing method of claim 6, wherein in the step S22, purifying the harmful gas further comprises the steps of:
step S24: removing carbon monoxide in the harmful gas; and/or
Step S26: and removing solid particles in the harmful gas.
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JP7337410B2 (en) * 2020-08-27 2023-09-04 烟台創為新能源科技股▲ふん▼有限公司 Battery pack exhaust filter system
CN114937776A (en) * 2022-05-30 2022-08-23 九环储能科技有限公司 Safety barrier blasting method for thermal runaway of immersed chemical energy storage device

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