CN114211961A - Thermal runaway protection method and protection system for power battery pack - Google Patents
Thermal runaway protection method and protection system for power battery pack Download PDFInfo
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- CN114211961A CN114211961A CN202010988552.3A CN202010988552A CN114211961A CN 114211961 A CN114211961 A CN 114211961A CN 202010988552 A CN202010988552 A CN 202010988552A CN 114211961 A CN114211961 A CN 114211961A
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- thermal runaway
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- battery pack
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- cell
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005059 dormancy Effects 0.000 claims abstract description 11
- 238000011217 control strategy Methods 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 7
- 230000011664 signaling Effects 0.000 claims description 2
- 230000002618 waking effect Effects 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 description 48
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 210000001787 dendrite Anatomy 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000006266 hibernation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000007958 sleep Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
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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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using 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 provides a thermal runaway protection method and a protection system for a power battery pack, wherein the protection method is used for executing thermal runaway protection of the power battery pack in a BMS dormancy, and comprises a thermal runaway preliminary determination step and a thermal runaway determination step, wherein in the thermal runaway preliminary determination step, the BMS is awakened periodically and automatically, current electric core state data of the power battery pack is collected after each awakening, whether the thermal runaway of the power battery pack occurs or not is judged according to the collected current electric core state data, current state signals of the power battery pack are collected in the thermal runaway determination step, and whether the thermal runaway of the power battery pack occurs or not is judged according to the collected current state signals. The thermal runaway protection method for the power battery pack can monitor the state of the power battery pack in the BMS dormancy so as to perform thermal runaway early warning, and can better protect the power battery pack and even the whole vehicle.
Description
Technical Field
The invention relates to the technical field of new energy automobile power battery pack protection, in particular to a power battery pack thermal runaway protection method, and meanwhile, the invention also relates to a power battery pack thermal runaway protection system based on the protection method.
Background
With the more and more prominent energy problems and environmental problems brought by fuel automobiles, China has begun to develop new energy automobiles vigorously, and power battery packs in the new energy automobiles are used as energy sources of the whole automobiles and occupy a very important position. The lithium battery has been widely used in new energy vehicles such as pure electric vehicles and hybrid electric vehicles due to a series of advantages of high energy density, long service life, high rated voltage and power, low self-discharge efficiency, and the like.
However, with the increase of the number of new energy vehicles, the safety problem brought by the new energy vehicles is gradually revealed, and the spontaneous combustion of the new energy vehicles is one of the main aspects. The reason that general new energy automobile catches fire and contains mainly has following several aspects, and first the trolley-bus carries out when overcharging overdischarging for a long time, can lead to appearing lithium dendrite, and lithium dendrite can impale the diaphragm and lead to the battery short circuit, and second can lead to interior short circuit and take place thermal runaway when the battery package has mechanical damage, and the third is that the battery is ageing can lead to the internal resistance to increase, increases at the charging and discharging in-process heat production volume, and the heat dissipation is untimely then can lead to the high temperature, takes place thermal runaway.
The first two of the three thermal runaway conditions described above occur most often, whether they produce lithium dendrites or mechanical damage, and many times do not immediately result in thermal runaway, but rather occur at intervals. However, if the BMS (BATTERY MANAGEMENT SYSTEM ) is sleeping when an accident occurs, thermal runaway will occur irreversibly, and therefore, it is very important for the new energy vehicle to monitor thermal runaway when not in use, and perform early warning and protection.
Disclosure of Invention
In view of this, the present invention is directed to a method for protecting a power battery pack from thermal runaway, so as to perform early warning of thermal runaway of the power battery pack during BMS dormancy, and perform better protection for the power battery pack and a vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a power battery pack thermal runaway protection method for performing power battery pack thermal runaway protection in BMS hibernation, the protection method comprising:
(a) preliminary step of determining thermal runaway
In the BMS dormancy, the BMS is automatically awakened periodically, and the current battery core state data of the power battery pack is collected after each awakening;
judging whether the power battery pack is out of thermal runaway or not according to the collected current battery core state data, and if so, entering the step (b) of determining the thermal runaway; if not, acquiring a difference value between the current electric core state data and the electric core state data acquired last time;
judging whether the power battery pack is out of control due to thermal runaway or not according to the obtained difference, if so, entering the step (b) of determining the out of control due to thermal runaway, and if not, storing the acquired current electric core state data;
(b) thermal runaway determination step
The BMS acquires a current state signal of the power battery pack;
and judging whether the power battery pack is out of control due to thermal runaway or not according to the acquired current state signal, if so, transmitting a thermal runaway alarm signal to the whole vehicle controller, and if not, storing the acquired current electric core state data.
Further, the collected cell state data includes at least one of cell voltage and cell temperature, and when the collected cell voltage is lower than a set voltage threshold and/or the collected cell temperature is higher than a set temperature threshold, it is determined that the thermal runaway occurs in the power battery pack.
Further, the obtained difference value comprises a cell voltage difference value and/or a cell temperature difference value, and when the cell voltage difference value is greater than a set voltage difference threshold value and/or the cell temperature difference value is greater than a set temperature difference threshold value, the power battery pack is judged to be out of thermal runaway.
Furthermore, the current state signal of the power battery pack is acquired through at least one of a pressure sensor, a CO sensor and a smoke sensor which are arranged at the position of the power battery pack or on a vehicle provided with the power battery pack.
Further, the collected cell state data includes a cell voltage, the protection method further includes, in the preliminary determining step of the thermal runaway and the determining step of the thermal runaway, entering (c) after storing the collected current cell state data, and the determining step of the cell under-voltage includes:
and judging whether the battery core of the power battery pack is smaller than a set undervoltage threshold value or not according to the collected current battery core voltage, if so, sending an undervoltage signal to a T-Box background by the BMS, and if not, sleeping the BMS.
Further, in the protection method, if the acquired current cell voltage is smaller than a preset minimum voltage threshold, the BMS is not automatically awakened any more.
Further, in the protection method, after the thermal runaway alarm signal is sent to the vehicle controller, the vehicle controller executes a thermal runaway control strategy, and the thermal runaway control strategy comprises at least one of sending the thermal runaway alarm signal and controlling the vehicle-mounted fire extinguishing device to extinguish fire.
Further, the BMS includes a BMS slave board and a BMS master board, the preliminary thermal runaway determination step is performed by the BMS slave board, and the thermal runaway determination step is performed by the BMS master board after the BMS slave board wakes up the BMS master board.
Compared with the prior art, the invention has the following advantages:
according to the thermal runaway protection method for the power battery pack, the periodic awakening of the BMS in the dormancy is utilized, the thermal runaway preliminary determination step is executed in each awakening, and the thermal runaway determination step is executed according to the requirement, so that the state of the power battery pack can be detected at regular time, and a thermal runaway alarm signal can be sent to the whole vehicle when the thermal runaway of the power battery pack is judged according to the detection result, so that the thermal runaway early warning of the power battery pack can be realized, and the power battery pack and the whole vehicle can be protected better.
Another object of the present invention is to provide a thermal runaway protection system for a power battery pack, the protection system being used for performing thermal runaway protection for the power battery pack during BMS hibernation, and the protection system comprising:
the first acquisition module is connected with the BMS and used for acquiring the current cell state data of the power battery pack;
the second acquisition module is connected with the BMS and is used for acquiring current state signals of the power battery pack;
the wake-up module is arranged in the BMS and is used for periodically and automatically waking up the thermal runaway preliminary determination module;
the thermal runaway preliminary determination module is arranged in the BMS and used for judging whether the thermal runaway happens to the power battery pack or not according to the collected current battery cell state data and storing the collected current battery cell state data;
and the thermal runaway determining module is arranged in the BMS and is used for judging whether the thermal runaway happens to the power battery pack according to the acquired current state signal.
Further, including BMS slave plate and BMS mainboard in the BMS, awaken up the module with the preliminary module of confirming of thermal runaway locates on the BMS slave plate, the module is confirmed to confirm that the thermal runaway locates on the BMS mainboard, just the BMS mainboard can be awaken up by the BMS slave plate.
Compared with the prior art, the thermal runaway protection system of the power battery pack has the same advantages as the protection method, and is not described again.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present embodiment, it should be noted that the terms "first", "second", and the like, which are presented herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The embodiment firstly relates to a power battery package thermal runaway protection system, and this protection system is applied to new energy automobile, new energy automobile includes the pure electric vehicles who uses power battery package as energy source purely to and be equipped with power battery package and fuel engine's hybrid vehicle simultaneously, and preferred, the protection system of this embodiment is for using on pure electric vehicles, and it specifically is for being arranged in carrying out power battery package thermal runaway protection in the BMS dormancy of power battery package, with the safety of protection power battery package and even whole car.
In terms of composition, the thermal runaway protection system for the power battery pack of the embodiment comprises a first acquisition module, a second acquisition module, a wake-up module, a thermal runaway preliminary determination module and a thermal runaway determination module.
The first acquisition module is connected with the BMS, the acquisition module is used for acquiring current cell state data of the power battery pack, the second acquisition module is also connected with the BMS, and the second acquisition module is used for acquiring current state signals of the power battery pack.
The awakening module, the thermal runaway preliminary determination module and the thermal runaway determination module are all arranged in the BMS, and in design, the awakening module is used for periodically and automatically awakening the thermal runaway preliminary determination module, and the thermal runaway preliminary determination module is used for judging whether thermal runaway occurs in the power battery pack according to the collected current battery cell state data and storing the collected current battery cell state data. The thermal runaway determination module is used for judging whether the thermal runaway of the power battery pack occurs according to the collected current state signal.
In this embodiment, the above preliminary thermal runaway determining module and the thermal runaway determining module may refer to the following detailed description for determining whether the power battery pack is in thermal runaway. In addition, in the structural arrangement, it should be noted that the BMS of the power battery pack of the embodiment includes the BMS slave board and the BMS main board, and the overall BMS structure formed by the BMS slave board and the BMS main board, which refers to the lithium battery BMS in the existing new energy vehicle, namely, the lithium battery management system.
Based on the configuration of the BMS, the wake-up module and the thermal runaway preliminary determination module are located on the BMS slave board, the thermal runaway determination module is located on the BMS main board, and the BMS main board can be woken up by the BMS slave board on the basis that the BMS slave board can be woken up by the wake-up module, so that the related control steps of the thermal runaway preliminary determination module and the thermal runaway determination module are respectively executed by the BMS slave board and the BMS main board.
The wake-up module on the slave board of the BMS of this embodiment may also employ the existing wake-up circuit module, and for the thermal runaway preliminary determination module and the thermal runaway determination module, it may also employ the logic circuit modules disposed on the slave board and the main board of the BMS, respectively, based on the control logic described below.
When the thermal runaway protection system for the power battery pack is used for performing the thermal runaway protection for the power battery pack, the overall control strategy adopted by the thermal runaway protection system for the power battery pack comprises the following steps.
(a) Preliminary step of determining thermal runaway
In the BMS dormancy, a thermal runaway preliminary determination module, namely a BMS slave board is automatically awakened periodically by an awakening module, and current cell state data of the power battery pack is collected after each awakening;
judging whether the power battery pack is out of thermal runaway or not according to the acquired current battery core state data, and if so, entering the following step (b) of determining the thermal runaway; if not, acquiring a difference value between the current electric core state data and the electric core state data acquired last time;
judging whether the power battery pack is in thermal runaway or not according to the obtained difference, if so, entering the step (b) of determining the thermal runaway, and if not, storing the acquired current battery cell state data by the BMS slave board;
(b) thermal runaway determination step
The thermal runaway determination module, namely the BMS mainboard, collects current state signals of the power battery pack;
and judging whether the power battery pack is out of control due to heat according to the acquired current state signal, if so, sending a warning signal of the out of control due to heat to the whole vehicle controller, and if not, storing the acquired current battery cell state data by the BMS slave board.
In the above-described overall strategy, as a preferred implementation form, the above-collected cell state data includes at least one of a cell voltage and a cell temperature, and generally, the current voltage and temperature of the cell may be collected at the same time. For the first acquisition module for acquiring the cell voltage and the temperature of the power battery pack, the first acquisition module is usually acquired through a voltage sensing component and a temperature sensing component, wherein the voltage sensing component and the temperature sensing component are electrically connected with each other.
When the collected current cell voltage and the collected current cell temperature are judged to be out of control thermally, the cell voltage collected by the BMS slave plate is lower than a set voltage threshold value, and the collected cell temperature is higher than a set temperature threshold value, and if at least one of the collected cell voltage and the collected cell temperature is met, the power battery pack can be judged to be out of control thermally.
The acquired difference value includes a cell voltage difference value and a cell temperature difference value, which substantially reflect the change rate of the voltage and the temperature of the cell. And for the BMS slave plate, when the cell voltage difference is greater than a set voltage difference threshold value, and the cell temperature difference is greater than a set temperature difference threshold value, namely the voltage change rate and the temperature change rate exceed the set threshold value, the thermal runaway of the power battery pack can be judged.
It should be noted that the above-mentioned set voltage threshold, set temperature threshold, set voltage difference threshold, set temperature difference threshold, and the collected cell voltage and temperature data, and the below-mentioned preset minimum voltage threshold, etc. are usually stored in the memory module of the slave board of the BMS, and the comparison between each collected data and the corresponding set threshold is performed by the relevant processing module in the slave board of the BMS. The specific value of each threshold can be selected according to the overall design principle and requirements in practical implementation.
In this embodiment, as an exemplary implementation form, the second collecting module for collecting the current state signal of the power battery pack may be at least one of a pressure sensor, a CO sensor, and a smoke sensor. At this time, the pressure sensor is usually disposed at the power battery pack, so that if the battery pack is in thermal runaway, the expansion of the battery pack may cause a change in the pressure value, thereby facilitating the pressure sensor to determine that the thermal runaway of the power battery pack actually occurs.
The CO sensor and the smoke sensor are usually mounted on a vehicle with the power battery pack, and therefore, along with thermal runaway of the power battery pack, CO gas and smoke are generated due to combustion, and the CO sensor and the smoke sensor can judge that the thermal runaway of the power battery pack really occurs when the CO gas and the smoke are detected.
The current state signals of the power battery pack detected by the sensor components are collected by the BMS mainboard, and the BMS mainboard can judge the real occurrence of thermal runaway of the power battery pack and send a thermal runaway alarm signal to the whole vehicle. At this time, the general BMS board transmits the thermal runaway alarm signal to the vehicle controller of the vehicle, and thus the vehicle controller may execute the thermal runaway control strategy. The thermal runaway control strategy can be used for sending out thermal runaway alarm signals in the forms of light, sound and the like, and can also be used for sending alarm information to a vehicle owner through a T-Box background, and meanwhile, the vehicle-mounted fire extinguishing device can be controlled by the vehicle control unit to extinguish fire.
The vehicle-mounted fire extinguishing device comprises a vehicle body, a vehicle control unit, a vehicle-mounted fire extinguishing device and a vehicle-mounted fire extinguishing device, wherein the vehicle-mounted fire extinguishing device can adopt various vehicle-mounted fire extinguishing structures used by the existing new energy vehicle, for example, the vehicle-mounted fire extinguishing device can store appropriate fire extinguishing materials in the vehicle and is a fire extinguishing device controlled by the vehicle control unit to act, when the power battery pack is out of control due to heat, the vehicle control unit enables the fire extinguishing device to act, and the stored fire extinguishing materials can be sprayed to the part of the power battery pack out of control due to heat.
In this embodiment, the method is adapted to collect the cell voltage of the power battery pack, and as a preferred embodiment, the protection method further includes, in the preliminary determining step of the thermal runaway and the determining step of the thermal runaway, entering the following step (c) after storing the collected current cell state data.
The step of determining the undervoltage of the battery core specifically comprises the steps of judging whether the battery core of the power battery pack is smaller than a set undervoltage threshold value or not according to the collected current battery core voltage, if so, sending an undervoltage signal to a T-Box background by a BMS slave board, and if not, enabling the BMS to sleep. Therefore, when the BMS slave board judges that the thermal runaway does not occur and the BMS main board judges that the thermal runaway does not really occur, the judgment of the undervoltage of the battery core can be utilized, and a vehicle owner can be timely informed to charge the battery when the battery core is undervoltage, so that the battery core in the power battery pack is ensured to be in a better state.
And after the battery core is judged not to be undervoltage and the BMS slave board sends an undervoltage signal to the T-Box background, the BMS can be enabled to enter the dormant state again. Of course, if the overall control strategy of this embodiment does not include the above step of determining the cell under-voltage, in both the step (a) and the step (b), the BMS may enter the sleep state again after storing the collected current cell state data.
In this embodiment, the collected cell voltages are used, and further, when the collected current cell voltages are smaller than the preset minimum voltage threshold value, the BMS slave board is set not to automatically wake up any more in the overall control strategy. At this moment, the cell voltage is smaller than the preset minimum voltage threshold, which indicates that the electric quantity of the power battery pack cell is very low, and the possibility of thermal runaway is low, so that the BMS is not awakened to save the electric quantity as much as possible.
According to the thermal runaway protection system and the method for the power battery pack, periodic awakening of the BMS in the dormancy is utilized, the thermal runaway preliminary determination step is executed in each awakening, and the thermal runaway determination step is executed as required, so that the timing detection of the state of the power battery pack can be realized, a thermal runaway alarm signal can be sent to the whole vehicle when the thermal runaway of the power battery pack is judged according to the detection result, the thermal runaway early warning of the power battery pack can be realized, and the power battery pack and the whole vehicle can be better protected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A thermal runaway protection method for a power battery pack is characterized by comprising the following steps: the protection method is used for executing thermal runaway protection of a power battery pack in BMS dormancy, and the protection method comprises the following steps:
(a) preliminary step of determining thermal runaway
In the BMS dormancy, the BMS is automatically awakened periodically, and the current battery core state data of the power battery pack is collected after each awakening;
judging whether the power battery pack is out of thermal runaway or not according to the collected current battery core state data, and if so, entering the step (b) of determining the thermal runaway; if not, acquiring a difference value between the current electric core state data and the electric core state data acquired last time;
judging whether the power battery pack is out of control due to thermal runaway or not according to the obtained difference, if so, entering the step (b) of determining the out of control due to thermal runaway, and if not, storing the acquired current electric core state data;
(b) thermal runaway determination step
The BMS acquires a current state signal of the power battery pack;
and judging whether the power battery pack is out of control due to thermal runaway or not according to the acquired current state signal, if so, transmitting a thermal runaway alarm signal to the whole vehicle controller, and if not, storing the acquired current electric core state data.
2. The method for protecting the power battery pack against thermal runaway of claim 1, wherein: the collected cell state data comprise at least one of cell voltage and cell temperature, and when the collected cell voltage is lower than a set voltage threshold and/or the collected cell temperature is higher than a set temperature threshold, the power battery pack is judged to be out of thermal runaway.
3. The method for protecting the power battery pack against thermal runaway according to claim 2, wherein: and the obtained difference value comprises a cell voltage difference value and/or a cell temperature difference value, and the cell voltage difference value is larger than a set voltage difference threshold value, and/or the cell temperature difference value is larger than a set temperature difference threshold value, the power battery pack is judged to be out of thermal runaway.
4. The method for protecting the power battery pack against thermal runaway of claim 1, wherein: the current state signal of the power battery pack is acquired through at least one of a pressure sensor, a CO sensor and a smoke sensor which are arranged at the power battery pack or on a vehicle provided with the power battery pack.
5. The method for protecting the power battery pack against thermal runaway of claim 1, wherein: the collected cell state data includes cell voltage, the protection method further includes, in the preliminary determining step of thermal runaway and the determining step of thermal runaway, entering into (c) the determining step of cell under-voltage after storing the collected current cell state data, and the determining step of cell under-voltage includes:
and judging whether the battery core of the power battery pack is smaller than a set undervoltage threshold value or not according to the collected current battery core voltage, if so, sending an undervoltage signal to a T-Box background by the BMS, and if not, sleeping the BMS.
6. The method for protecting the power battery pack against thermal runaway of claim 5, wherein: in the protection method, if the acquired current cell voltage is smaller than a preset minimum voltage threshold, the BMS is not automatically awakened.
7. The method for protecting the power battery pack against thermal runaway of claim 1, wherein: in the protection method, after a thermal runaway alarm signal is sent to a vehicle controller, the vehicle controller executes a thermal runaway control strategy, and the thermal runaway control strategy comprises at least one of sending the thermal runaway alarm signal and controlling a vehicle-mounted fire extinguishing device to extinguish fire.
8. The method for protecting the power battery pack against thermal runaway according to any one of claims 1 to 7, wherein: the BMS comprises a BMS slave plate and a BMS main plate, the preliminary thermal runaway determination step is executed by the BMS slave plate, and the thermal runaway determination step is executed by the BMS main plate after the BMS slave plate wakes up the BMS main plate.
9. The utility model provides a power battery package thermal runaway protection system which characterized in that: this protection system is used for carrying out power battery package thermal runaway protection in BMS dormancy, just the protection system includes:
the first acquisition module is connected with the BMS and used for acquiring the current cell state data of the power battery pack;
the second acquisition module is connected with the BMS and is used for acquiring current state signals of the power battery pack;
the wake-up module is arranged in the BMS and is used for periodically and automatically waking up the thermal runaway preliminary determination module;
the thermal runaway preliminary determination module is arranged in the BMS and used for judging whether the thermal runaway happens to the power battery pack or not according to the collected current battery cell state data and storing the collected current battery cell state data;
and the thermal runaway determining module is arranged in the BMS and is used for judging whether the thermal runaway happens to the power battery pack according to the acquired current state signal.
10. The power battery pack thermal runaway protection system of claim 9, wherein: the BMS is provided with a BMS slave plate and a BMS main plate, the awakening module and the thermal runaway preliminary determination module are arranged on the BMS slave plate, the thermal runaway determination module is arranged on the BMS main plate, and the BMS main plate can be awakened by the BMS slave plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN115882090A (en) * | 2023-02-06 | 2023-03-31 | 中创新航技术研究中心(深圳)有限公司 | Intelligent automatic control realization method and device of battery pack and battery pack |
| WO2023178555A1 (en) * | 2022-03-23 | 2023-09-28 | 时代电服科技有限公司 | Battery failure handling method and apparatus, system, electronic device, and storage medium |
| CN116916374A (en) * | 2023-09-13 | 2023-10-20 | 羿动新能源科技有限公司 | Wireless BMS channel quality evaluation method and system for power battery |
| WO2023225975A1 (en) * | 2022-05-27 | 2023-11-30 | 宁德时代新能源科技股份有限公司 | Thermal runaway detection method and apparatus |
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