CN113219353A - BMS-based thermal runaway control method and system - Google Patents
BMS-based thermal runaway control method and system Download PDFInfo
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- CN113219353A CN113219353A CN202110313974.5A CN202110313974A CN113219353A CN 113219353 A CN113219353 A CN 113219353A CN 202110313974 A CN202110313974 A CN 202110313974A CN 113219353 A CN113219353 A CN 113219353A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- 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 belongs to the technical field of automobile early warning, and particularly relates to a thermal runaway control method and a system based on a BMS (battery management system), wherein the thermal runaway control method based on the BMS comprises the following steps: (1) setting a battery fault threshold parameter; (2) acquiring battery operation parameters, and performing thermal runaway fault detection through a BMS (battery management system) according to the battery operation parameters and fault threshold parameters to generate a fault detection early warning result; (3) executing a corresponding fault processing strategy according to the fault detection early warning result; the invention can effectively reduce the misjudgment of thermal failure and improve the judgment efficiency of the thermal failure fault of the battery.
Description
Technical Field
The invention belongs to the technical field of automobile early warning, and particularly relates to a thermal runaway control method and system based on a BMS (battery management system).
Background
Electric automobiles have various problems of poor cruising ability, use safety, low-temperature charging problem, thermal runaway, mileage decay caused by capacity decay and the like. Both manufacturing companies and research institutes have been working to find solutions and methods and have made advances in the issues related to thermal runaway of occupants in vehicles. In the current power battery industry, aiming at the problem of thermal runaway, two main measures are mainly taken from the aspects of early accurate monitoring and process control, and the two measures are mainly used for carrying out product design from a battery cell and a PACK.
The thermal runaway refers to the phenomenon that the self-temperature rise rate of the battery is rapidly changed and irreversible due to the single battery exothermic chain reaction, so that overheating, fire and explosion are caused. In the field of new energy automobiles, a plurality of fire accidents are caused by thermal runaway of batteries, and the safety accidents undoubtedly cause great attack on life and property safety of people. Therefore, the problem of thermal runaway of the power battery must be effectively inhibited in the healthy development of new energy automobiles.
At present, various large host plants set numerous response mechanisms and processing methods for thermal failure, but effective and accurate thermal runaway alarm becomes a difficult problem for providing escape time for passenger safety, so that the development of a reasonable battery thermal failure early warning mechanism is very important.
Disclosure of Invention
Based on the above disadvantages and shortcomings of the prior art, it is an object of the present invention to at least solve one or more of the above problems of the prior art, in other words, to provide a BMS-based thermal runaway control method and system thereof that satisfies one or more of the above needs.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thermal runaway control method based on BMS comprises the following steps:
(1) setting a battery fault threshold parameter;
(2) acquiring battery operation parameters, and performing thermal runaway fault detection through a BMS (battery management system) according to the battery operation parameters and fault threshold parameters to generate a fault detection early warning result;
(3) and executing a corresponding fault processing strategy according to the fault detection early warning result.
Preferably, the battery failure threshold parameter includes a maximum temperature value, a temperature difference value, a temperature rise rate, a pressure difference value, and a pressure drop rate of the battery.
Preferably, the battery operating parameters include a current temperature value, a current voltage value, a current insulation resistance value, a current voltage difference and a current temperature difference of the battery.
As a preferred scheme, the BMS in step (2) starts power-on self-test after receiving the wake-up signal, and performs thermal runaway fault detection after the BMS performs power-on self-test and initialization.
Preferably, the thermal runaway fault detection includes: the BMS acquires the current working state of the battery and acquires the current operation parameters of the battery in the current working state according to the current working state; obtaining a plurality of fault threshold parameters corresponding to current operating parameters; and generating a fault detection result of the battery in the current working state according to the magnitude relation between the current operation parameter and the plurality of fault threshold parameters.
As an optimal scheme, the fault detection early warning result comprises pressure early warning, temperature early warning and insulation resistance early warning.
Preferably, the BMS performs high-voltage power-off after power reduction, and the thermal runaway fault detection is continuously and circularly detected after the BMS is powered on.
The present invention also provides a thermal runaway control system based on a BMS, comprising:
the preprocessing module is used for setting a battery failure threshold parameter;
the detection module is used for acquiring battery operation parameters and detecting a thermal runaway fault detection result through the BMS according to the battery operation parameters and the fault threshold parameters;
and the execution module is used for executing a corresponding fault processing strategy according to the fault detection early warning result.
Preferably, the detection module includes:
and the early warning module is used for realizing pressure early warning, temperature early warning and insulation resistance early warning according to the fault detection early warning result.
Compared with the prior art, the invention has the beneficial effects that:
the invention can effectively reduce the misjudgment of the thermal failure, improve the judging efficiency of the thermal failure and is convenient and quick.
According to the invention, continuous cycle detection is realized after the BMS is powered on through the thermal runaway fault detection and judgment process, a certain reference value can be provided for the application layer software of the thermal runaway fault judgment module by the BMS, and effective and accurate thermal runaway alarm can be realized when an emergency occurs, so that the escape time can be provided for the safety of passengers.
Drawings
Fig. 1 is a flowchart of a BMS-based thermal runaway control method according to a first embodiment of the present invention;
fig. 2 is a block diagram of a BMS-based thermal runaway control system according to a second embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a thermal runaway control method based on a BMS, including the following steps:
(1) setting a battery fault threshold parameter;
the battery fault threshold parameters comprise a maximum temperature value, a temperature difference value, a temperature rise rate, a pressure difference value and a pressure drop rate of the battery; under the over-temperature condition of the battery fault threshold, the maximum temperature value of the battery is 68 ℃ (2000 ms), the temperature difference value between the maximum temperature and the minimum temperature is 30 ℃ (2000 ms), the temperature rise rate is set to be 1 DEG rise every 5s and recorded for 1 time, and the temperature rise rate is continuously recorded for 3 times; and 5s is a calculation period, and the temperature rise is calculated in a sliding manner, namely the temperature rise is calculated in the 5 th s and the 0 th s, the temperature rise is calculated in the 6 th s and the 1 st s, and the temperature rise is calculated in the 7 th s and the 2 nd s.
The voltage drop value is continuously set to 3 detection periods of 500ms, the sum of the voltage drops is more than 500mv, and when the sum of the voltage drops is more than 500mv, the maximum and minimum single pressure difference value is 600mv (2000 ms).
(2) Acquiring battery operation parameters, and performing thermal runaway fault detection through a BMS (battery management system) according to the battery operation parameters and fault threshold parameters to generate a fault detection early warning result;
the battery operation parameters comprise the current temperature value, the current voltage value, the current insulation resistance value, the current pressure difference and the current temperature difference of the battery; the BMS (battery management system) detects the battery temperature, the battery voltage, and the insulation resistance value.
The BMS acquires the current working state of the battery and acquires the current operation parameters of the battery in the current working state according to the current working state; obtaining a plurality of fault threshold parameters corresponding to current operating parameters; and generating a fault detection result of the battery in the current working state according to the magnitude relation between the current operation parameter and the plurality of fault threshold parameters.
And the BMS starts power-on self-detection after receiving the wake-up signal, and enters a thermal runaway fault detection and judgment process after the BMS successfully performs power-on self-detection and initialization.
In this embodiment, the data sampled by the cell temperature is combined with whether the following fault occurs within 20s before the CMC communication disconnection lasts 2000 ms:
whether the current insulation resistance value is less than 70% of the previous four periods resistance value or not is judged through detection, the detection duration time meets the requirement that the current insulation resistance value is not less than three periods, and otherwise, insulation resistance value early warning is sent out through a BMS.
Whether an over-temperature fault and an over-fast temperature rise fault exists is judged through detection, and if the maximum temperature value of the battery is larger than 68 ℃ (2000 ms), the temperature difference value between the maximum temperature and the minimum temperature is larger than 30 ℃ (2000 ms); a corresponding temperature pre-warning is sent out by the BMS.
Whether the voltage suddenly fails and the temperature rises too fast is judged by detection, namely, the voltage difference value is larger than 600mV, the voltage steep drop value passes through 3 detection periods of 500ms continuously, the sum of the voltage drops is larger than 500mV, the voltage difference value is larger than 300mV, and the voltage of a single battery is larger than 4.35V/500 ms; minimum voltage is less than 2.1V (500 ms); and if the faults exist, sending out corresponding pressure early warning through the BMS.
(3) Executing a corresponding fault processing strategy according to the fault detection early warning result;
in the execution process, the detection signal is filtered, the fault is maintained for 1s, and the thermal failure fault is triggered according to the fault maintenance time; if the duration is not 1s, the state is not updated through thermal runaway (the initial value is normal), the thermal failure fault detection is restarted, and a corresponding fault processing strategy is executed through the BMS according to the fault detection early warning result.
And after the BMS executes power reduction, the high-voltage power is cut off, and the thermal runaway fault detection is continuously and circularly detected after the BMS is electrified so as to realize thermal runaway alarm.
Compared with the prior art, the control method of the embodiment has the following technical effects:
the method can effectively reduce the misjudgment rate of the thermal failure of the battery, improve the judgment efficiency of the thermal failure, is convenient and quick, and realizes the thermal runaway alarm; the thermal runaway fault detection realizes continuous cycle detection after the BMS is electrified, can provide certain reference value for the application layer software of the thermal runaway fault judgment module by the BMS, and can realize effective and accurate thermal runaway alarm to provide escape time for safety of passengers when emergency occurs.
Example two:
as shown in fig. 2, the present embodiment provides a BMS-based thermal runaway control system, including:
the preprocessing module 11 is used for setting a battery failure threshold parameter;
the detection module 12 is used for acquiring battery operation parameters and performing thermal runaway fault detection results through the BMS according to the battery operation parameters and the fault threshold parameters;
and the execution module 13 is configured to execute a corresponding fault handling policy according to the fault detection early warning result.
The detection module 12 includes:
and the early warning module is used for realizing pressure early warning, temperature early warning and insulation resistance early warning according to the fault detection early warning result.
Compared with the prior art, the system of the embodiment has the following technical effects:
the method can effectively reduce the misjudgment rate of the thermal failure of the battery, improve the judgment efficiency of the thermal failure, is convenient and quick, and realizes the thermal runaway alarm; the thermal runaway fault detection realizes continuous cycle detection after the BMS is electrified, can provide certain reference value for the application layer software of the thermal runaway fault judgment module by the BMS, and can realize effective and accurate thermal runaway alarm to provide escape time for safety of passengers when emergency occurs.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.
Claims (9)
1. A thermal runaway control method based on BMS is characterized by comprising the following steps:
(1) setting a battery fault threshold parameter;
(2) acquiring battery operation parameters, and performing thermal runaway fault detection through a BMS (battery management system) according to the battery operation parameters and fault threshold parameters to generate a fault detection early warning result;
(3) and executing a corresponding fault processing strategy according to the fault detection early warning result.
2. The BMS-based thermal runaway control method of claim 1, wherein the battery failure threshold parameters comprise a battery maximum temperature value, a temperature difference value, a temperature rise rate, a pressure difference value, and a pressure drop rate.
3. The BMS-based thermal runaway control method of claim 1, wherein the battery operating parameters comprise a current temperature value, a current voltage value, a current insulation resistance value, a current voltage difference, and a current temperature difference of the battery.
4. The BMS-based thermal runaway control method according to claim 1, wherein in step (2), the BMS starts power-on self-test after receiving the wake-up signal, and the BMS performs power-on self-test and initialization to perform thermal runaway fault detection.
5. The BMS-based thermal runaway control method of claim 4, wherein the thermal runaway fault detection comprises: the BMS acquires the current working state of the battery and acquires the current operation parameters of the battery in the current working state according to the current working state; obtaining a plurality of fault threshold parameters corresponding to current operating parameters; and generating a fault detection result of the battery in the current working state according to the magnitude relation between the current operation parameter and the plurality of fault threshold parameters.
6. The BMS-based thermal runaway control method of claim 5, wherein the fault detection pre-warning results comprise a pressure pre-warning, a temperature pre-warning and an insulation resistance pre-warning.
7. The BMS-based thermal runaway control method of claim 1, wherein the BMS performs high voltage power down after power down and thermal runaway fault detection continues cycling after the BMS is powered up.
8. A BMS-based thermal runaway control system, comprising:
the preprocessing module is used for setting a battery failure threshold parameter;
the detection module is used for acquiring battery operation parameters and detecting a thermal runaway fault detection result through the BMS according to the battery operation parameters and the fault threshold parameters;
and the execution module is used for executing a corresponding fault processing strategy according to the fault detection early warning result.
9. The BMS-based thermal runaway control system of claim 8, wherein the detection module comprises:
and the early warning module is used for realizing pressure early warning, temperature early warning and insulation resistance early warning according to the fault detection early warning result.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114069080A (en) * | 2021-11-15 | 2022-02-18 | 合众新能源汽车有限公司 | Battery thermal runaway early warning method and system, intelligent terminal and computer readable medium |
| CN114137421A (en) * | 2021-11-30 | 2022-03-04 | 蜂巢能源(上海)有限公司 | Battery abnormality detection method, apparatus, device and storage medium |
| CN115629327A (en) * | 2022-12-21 | 2023-01-20 | 广州巨湾技研有限公司 | Battery pack thermal runaway detection method and device and battery pack detection method |
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| CN108711893A (en) * | 2018-04-08 | 2018-10-26 | 江西优特汽车技术有限公司 | A kind of power battery thermal runaway early warning system and method |
| CN109786872A (en) * | 2019-03-18 | 2019-05-21 | 北京航空航天大学 | A kind of lithium ion battery thermal runaway early warning system and method |
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2021
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| CN108711893A (en) * | 2018-04-08 | 2018-10-26 | 江西优特汽车技术有限公司 | A kind of power battery thermal runaway early warning system and method |
| CN109786872A (en) * | 2019-03-18 | 2019-05-21 | 北京航空航天大学 | A kind of lithium ion battery thermal runaway early warning system and method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114069080A (en) * | 2021-11-15 | 2022-02-18 | 合众新能源汽车有限公司 | Battery thermal runaway early warning method and system, intelligent terminal and computer readable medium |
| CN114137421A (en) * | 2021-11-30 | 2022-03-04 | 蜂巢能源(上海)有限公司 | Battery abnormality detection method, apparatus, device and storage medium |
| CN114137421B (en) * | 2021-11-30 | 2023-09-19 | 章鱼博士智能技术(上海)有限公司 | Battery abnormality detection method, device, equipment and storage medium |
| CN115629327A (en) * | 2022-12-21 | 2023-01-20 | 广州巨湾技研有限公司 | Battery pack thermal runaway detection method and device and battery pack detection method |
| CN115629327B (en) * | 2022-12-21 | 2023-06-16 | 广州巨湾技研有限公司 | Battery pack thermal runaway detection method and device and battery pack |
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Application publication date: 20210806 |