CN115064817A - Method, device and system for preventing thermal runaway - Google Patents
Method, device and system for preventing thermal runaway Download PDFInfo
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- CN115064817A CN115064817A CN202210705324.XA CN202210705324A CN115064817A CN 115064817 A CN115064817 A CN 115064817A CN 202210705324 A CN202210705324 A CN 202210705324A CN 115064817 A CN115064817 A CN 115064817A
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
- H01M10/425—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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6566—Means within the gas flow to guide the flow around one or more cells, e.g. manifolds, baffles or other barriers
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
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Abstract
The invention provides a method, a device and a system for preventing thermal runaway, wherein the system is connected with a battery pack, the battery pack comprises a plurality of battery modules, each battery module comprises a plurality of single battery cores, and the system comprises: the acquisition module comprises a voltage sampling circuit corresponding to each single battery cell and a plurality of temperature sensors in each battery module, and is used for acquiring the voltage and the ambient temperature of each single battery cell; the controller is used for judging whether the voltage and the ambient temperature of each single battery cell meet preset thermal runaway conditions or not to obtain a judgment result, and generating a control instruction when the judgment result shows that a target single battery cell meets the preset thermal runaway conditions; the thermal runaway control module is used for controlling the cooling mechanism to perform cooling operation on the target single battery cell based on the control instruction; the cooling mechanism is connected with the battery pack, and measures for cooling are started when the battery cells are monitored to be about to generate thermal runaway, so that the thermal runaway is actively prevented, and the safety of the battery pack is ensured.
Description
Technical Field
The invention relates to the technical field of battery packs, in particular to a method, a device and a system for preventing thermal runaway.
Background
New energy automobile develops more and more fast, and the safety in utilization of battery package also arouses more and more to attach attention, arouses the battery package accident of catching a fire in order to avoid battery thermal runaway to reduce whole car and driver and crew's safety risk, taken many measures. For example, a heat insulation pad is added between the electric cores, a heat-resistant heat insulation board is added to delay the transmission process, a fire-fighting bomb is additionally arranged in the battery pack, the thermal runaway of the battery pack is monitored, the fire-fighting bomb is started to extinguish open fire, the thermal runaway is predicted, and the like.
However, the above measures cannot actively prevent thermal runaway, and therefore how to effectively prevent thermal runaway is a technical problem to be solved at present.
Disclosure of Invention
In view of the above, the present invention has been developed to provide a method, apparatus, and system for preventing thermal runaway that overcome, or at least partially solve, the above-described problems.
In a first aspect, the present invention provides a system for preventing thermal runaway, which connects a battery pack, where the battery pack includes a plurality of battery modules, each battery module includes a plurality of battery cells, and the system includes:
an acquisition module comprising: the battery module comprises a voltage sampling circuit corresponding to each single battery cell and a plurality of temperature sensors positioned in each battery module, and is used for acquiring the voltage and the ambient temperature of each single battery cell;
the controller is used for judging whether the voltage and the ambient temperature of each single battery cell meet preset thermal runaway conditions or not to obtain a judgment result, and generating a control instruction when the judgment result shows that a target single battery cell meets the preset thermal runaway conditions;
the thermal runaway control module is used for controlling the cooling mechanism to perform cooling operation on the target single battery cell based on the control instruction;
and the cooling mechanism is connected with the battery pack.
Preferably, the preset thermal runaway condition comprises:
the voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the highest temperature around the single battery cell is larger than a preset temperature, and the duration time reaches a second preset time; or
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature difference around the single battery cell is larger than a preset temperature difference, and the duration time reaches a second preset time; or
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature change rate around the single battery cell is larger than a preset rate, and the duration time is larger than a second preset time; or
The maximum temperature around the single battery cell is greater than the preset temperature, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The voltage of the single battery cell is smaller than the preset voltage, the duration time reaches a first preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The temperature difference around the single battery cell is larger than the preset temperature difference, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is larger than or equal to 1; or
The number of failures of the temperature sensors is greater than or equal to 2, and the number of failures of the voltage sampling lines of the single battery cells is greater than or equal to 1.
Preferably, the controller is further configured to:
judging whether the voltage and the ambient temperature of the target single battery cell meet preset cooling stopping conditions or not, and if so, generating a sleep signal;
the thermal runaway control module is further used for controlling the cooling mechanism to stop cooling operation based on the dormancy signal.
Preferably, the cooling-down stopping condition includes:
the voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the highest temperature around the single battery cell is smaller than the preset temperature, and the duration time reaches a fourth preset time; or
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature change rate around the single battery cell is smaller than a preset rate, and the duration time reaches a fourth preset time; or
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature difference around the single battery cell is smaller than the preset temperature difference, and the duration time reaches a fourth preset time; or
The maximum temperature around the single battery cell is smaller than the preset temperature, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or
The single battery cell is in a normal voltage range, the duration time reaches a third preset time, and meanwhile the number of faults of a voltage sampling circuit of the single battery cell is 0; or alternatively
The temperature difference around the single battery cell is smaller than the preset temperature difference, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or
The failure number of the temperature sensors is less than or equal to 1, and the failure number of the voltage sampling circuit of the single battery cell is 0.
Preferably, each individual cell has a unique identification code, and the controller is further configured to:
determining a coordinate of a target monomer battery cell after determining that the voltage and the ambient temperature of the target monomer battery cell meet a preset thermal runaway condition, wherein the coordinate is a unique identification code corresponding to the target monomer battery cell;
and generating a control instruction based on the coordinates of the target single battery cell.
Preferably, the cooling mechanism includes:
a high-pressure gas generating device for generating high-pressure gas;
a turbine tube for separating the high pressure gas into a cold gas stream;
the air delivery pipe corresponds to each battery module and is used for delivering the cold air flow to the corresponding battery module;
the electromagnetic valve is arranged on the air outlet branch of the air delivery pipe, and the electromagnetic valve is opened to realize the cooling operation of the battery module where the target single battery cell is located.
In a second aspect, the present invention also provides a method for preventing thermal runaway, comprising:
acquiring the voltage and the ambient temperature of a single battery cell in each battery module in the battery pack;
judging whether the voltage and the ambient temperature of each single battery cell meet the set thermal runaway condition or not to obtain a judgment result;
and generating a control instruction to control a cooling mechanism connected with a battery pack to perform cooling operation on the target single battery cell when the judgment result shows that the target single battery cell meets a preset thermal runaway condition.
In a third aspect, the present invention also provides an apparatus for preventing thermal runaway, comprising:
the acquisition module is used for acquiring the voltage and the ambient temperature of the single battery cell in each battery module in the battery pack;
the judgment module is used for judging whether the voltage and the ambient temperature of each single battery cell meet the set thermal runaway condition or not to obtain a judgment result;
and the control module is used for generating a control instruction when the judgment result shows that the target single battery cell meets a preset thermal runaway condition so as to control the cooling mechanism connected with the battery pack to perform cooling operation on the target single battery cell.
In a fourth aspect, the present invention further provides a new energy automobile, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the above method steps.
In a fifth aspect, the invention also provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method steps.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention provides a system for preventing thermal runaway, which is connected with a battery pack, wherein the battery pack comprises a plurality of battery modules, each battery module comprises a plurality of monomer battery cores, and the system comprises: the acquisition module comprises a voltage sampling circuit corresponding to each single battery cell and a plurality of temperature sensors positioned in each battery module and is used for acquiring the voltage and the ambient temperature of each single battery cell; the controller is used for judging whether the voltage and the ambient temperature of each single battery cell meet preset thermal runaway conditions or not to obtain a judgment result, and generating a control instruction when the judgment result shows that a target single battery cell meets the preset thermal runaway conditions; the thermal runaway control module is used for controlling the cooling mechanism to perform cooling operation on the target single battery cell based on the control instruction; the cooling mechanism is connected with the battery pack, and then monitors the voltage and the ambient temperature of each single battery cell, and starts cooling measures as early as possible when the single battery cell is about to generate thermal runaway, so as to actively prevent the thermal runaway and ensure the safety of the battery pack.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 shows a schematic block diagram of a system for preventing thermal runaway in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a cooling mechanism in an embodiment of the invention;
FIG. 3 is a flow chart illustrating steps of a method for preventing thermal runaway in an embodiment of the invention;
FIG. 4 shows a schematic configuration of an apparatus for preventing thermal runaway in an embodiment of the invention;
fig. 5 shows a schematic diagram of a new energy vehicle implementing the method for preventing thermal runaway in the embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example one
An embodiment of the present invention provides a system for preventing thermal runaway, and as shown in fig. 1, the system is connected to a battery pack a, where the battery pack a includes a plurality of battery modules, and each battery module includes a plurality of battery cells. Specifically, the system comprises:
the controller 102 is configured to determine whether the voltage and the ambient temperature of each individual battery cell meet a preset thermal runaway condition, obtain a determination result, and generate a control instruction when the determination result indicates that a target individual battery cell meets the preset thermal runaway condition;
the thermal runaway control module 103 is used for controlling the cooling mechanism to perform cooling operation on the target single battery cell based on the control instruction;
and a cooling mechanism 104, wherein the cooling mechanism 104 is connected with the battery pack A.
In order to cool down the battery pack A as soon as possible under the condition that the thermal runaway occurs in the battery pack A, the temperature and the voltage of each monomer battery cell in the battery pack A are monitored through a temperature sensor and a voltage sampling circuit in an acquisition module, and when the target monomer battery cell is monitored to meet the thermal runaway condition, the cooling mechanism connected with the battery pack A is controlled to cool down in time, so that the thermal runaway is effectively prevented.
In an alternative embodiment, the predetermined thermal runaway condition comprises any one of:
firstly, the voltage of the single battery cell is smaller than the preset voltage, the duration time reaches a first preset time, meanwhile, the highest temperature around the single battery cell is larger than the preset temperature, and the duration time reaches a second preset time.
And secondly, the voltage of the monomer battery cell is less than the preset voltage, the duration time reaches the first preset time, the temperature difference around the monomer battery cell is greater than the preset temperature difference, and the duration time reaches the second preset time.
And thirdly, the voltage of the monomer battery cell is smaller than the preset voltage, the duration time reaches the first preset time, meanwhile, the temperature change rate around the monomer battery cell is greater than the preset rate, and the duration time is greater than the second preset time.
Fourthly, the highest temperature around the single battery cell is larger than the preset temperature, the duration time reaches a second preset time, and meanwhile the number of faults occurring on the voltage sampling circuit of the single battery cell is larger than or equal to 1.
Fifthly, the voltage of the single battery cell is smaller than the preset voltage, the duration time reaches a first preset time, and the number of the faults occurring on the voltage sampling circuit of the single battery cell is larger than or equal to 1.
Sixthly, the temperature difference around the single battery cell is larger than the preset temperature difference, the duration time reaches a second preset time, and meanwhile, the number of the voltage sampling lines of the single battery cell which break down is larger than or equal to 1.
Seventhly, the number of failures of the temperature sensors is greater than or equal to 2, and the number of failures occurring in the voltage sampling lines of the single battery cells is greater than or equal to 1.
When the acquisition module 101 acquires any one of the above conditions of the single battery cells, the controller 102 determines that the single battery cell meets a preset thermal runaway condition.
This predetermined thermal runaway condition not only can monitor the voltage and the ambient temperature of monomer electricity core to judge whether thermal runaway appears, moreover, can also be based on the voltage and the ambient temperature of monomer electricity core, confirm the quantity that breaks down and temperature sensor of voltage sampling circuit appear inefficacy, based on this quantity or combine quantity and temperature or quantity and voltage, judge whether thermal runaway appears, and then can master the condition of thermal runaway more comprehensively.
When the controller 102 determines that the voltage and the ambient temperature of the target cell meet the preset thermal runaway condition, a control instruction is generated.
The control instruction is transmitted to the thermal runaway control module 103, and the thermal runaway control module 103 controls the cooling mechanism to perform a cooling operation on the target monomer battery cell based on the control instruction.
In an alternative embodiment, each individual cell has a unique identification code. The controller 102 may determine a coordinate of the target cell after determining that the voltage and the ambient temperature of the target cell meet a preset thermal runaway condition, where the coordinate is a unique identification code corresponding to the target cell.
For example, the cell in which thermal runaway occurs is determined to be the cell numbered 24, and the coordinates of the cell in the target table are located at 24. And determining that thermal runaway occurs in a fourth single battery cell of the second battery module according to the serial number. Then, when the cooling mechanism performs the cooling operation on the target single battery cell, the battery module where the single battery cell corresponding to the coordinate is located is controlled to perform the cooling operation.
The following is a detailed description of the cooling mechanism:
as shown in fig. 2, the temperature lowering mechanism includes: a high-pressure gas generating device 201 for generating high-pressure gas; a turbine pipe 202 for separating the high pressure gas out of a cold gas stream; the air delivery pipe 203 corresponding to each battery module is used for delivering cold air flow to the corresponding battery module; the electromagnetic valve 204 is arranged on the air outlet branch of the input pipe, and the cooling operation of the battery module where the target single battery cell is located is realized by opening the electromagnetic valve 204.
When determining that the target single battery cell is out of thermal runaway, the thermal runaway control module 103 controls the high-pressure gas generation device 201 to generate high-pressure gas, so that the turbine pipe 202 separates the high-pressure gas out of cold airflow to reach the corresponding battery module through the summer pipeline 203, and opens the corresponding electromagnetic valve 204 to cool the battery module where the target single battery cell is located.
Adopt this cooling mechanism, not only can effectively cool down to the battery module that thermal runaway appears pertinence ground, moreover, the cooling effect that adopts this turbine pipe 202 is better.
The operation of controlling the cooling mechanism 104 to cool is described above, and when the target cell electric core with thermal runaway returns to normal, the cooling mechanism 104 may also be controlled to stop cooling. Specifically, the controller 102 is further configured to determine whether the voltage and the ambient temperature of the target cell meet a preset cooling stop condition, and if yes, generate a sleep signal; the thermal runaway control module 104 is further configured to control the cooling mechanism to perform a cooling stop action on the target individual battery cell based on the sleep signal.
Specifically, the preset cooling stop condition is similar to the preset thermal runaway condition and includes any one of the following conditions:
firstly, the voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the highest temperature around the single battery cell is smaller than a preset temperature, and the duration time reaches a fourth preset time.
And secondly, the voltage of the monomer battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature change rate around the monomer battery cell is smaller than a preset rate, and the duration time reaches a fourth preset time.
And thirdly, the voltage of the monomer battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature difference around the monomer battery cell is smaller than the preset temperature difference, and the duration time reaches a fourth preset time.
Fourthly, the highest temperature around the single battery cell is smaller than the preset temperature, the duration time reaches the fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0.
Fifthly, the single battery cell is in a normal voltage range, the duration time reaches a third preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0.
Sixthly, the temperature difference around the single battery cell is smaller than the preset temperature difference, the duration time reaches the fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0.
And seventhly, the failure number of the temperature sensors is less than or equal to 1, and the fault number of the voltage sampling circuit of the single battery cell is 0.
Similarly, whether the single battery cell is recovered to be normal or not can be judged according to the voltage and the ambient temperature of the single battery cell, the number of faults occurring on a voltage line of the single battery cell and the failure number of the temperature sensors can be determined according to the voltage and the ambient temperature of the single battery cell, and whether the single battery cell is recovered to be normal or not is judged according to the combination of the number and the temperature or the combination of the number and the voltage.
When the controller 102 determines that the target individual battery cell is normal, the controller determines that the target individual battery cell is normal, and generates dormancy information, the thermal runaway control module 103 controls the cooling mechanism 104 to stop cooling operation based on the dormancy information.
The operation of the system for preventing thermal runaway will be described below by way of example.
To a battery package A, including 8 battery modules, each battery module includes 4 electric cores, and according to the voltage platform by low to high principle with its serial number for monomer electricity core 1, monomer electricity core 2, monomer electricity core 3, monomer electricity core 4 belong to battery module 1, monomer electricity core 5, monomer electricity core 6, monomer electricity core 7, monomer electricity core 8 belong to battery module 2. Analogize in proper order, the branch of giving vent to anger of 8 gas-supply pipes of this cooling mechanism 104 arranges respectively near 8 battery modules, all be provided with an solenoid valve on the branch of giving vent to anger of every gas-supply pipe, the serial number of solenoid valve corresponds the serial number of battery module, when the signal that controller 102 was gathered according to collection module 101 confirms that target monomer electricity core 3 appears the thermal runaway, control signal is sent to thermal runaway control module 103, including the monomer electricity core coordinate that appears the thermal runaway in this control signal, 3 numbers promptly, then high-pressure gas generating device 201 in the thermal runaway control module 103 control cooling mechanism 104 inputs high-pressure gas to turbine pipe 202, and open corresponding solenoid valve 1, in order to realize the cooling to the battery module 1 that target monomer electricity core 3 locates to. When the controller 102 receives a signal that the target monomer electric core 3 fed back by the acquisition module 101 has recovered to be normal, the controller sends a sleep signal to the thermal runaway control module 103 to control the electromagnetic valve 1 corresponding to the battery module 1 in the cooling mechanism 104 to be closed, so as to stop the cooling operation.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the invention provides a system for preventing thermal runaway, which is connected with a battery pack, wherein the battery pack comprises a plurality of battery modules, each battery module comprises a plurality of monomer battery cores, and the system comprises: the acquisition module comprises a temperature sensor corresponding to each single battery cell and a voltage sampling circuit, and is used for acquiring the voltage and the ambient temperature of each single battery cell; the controller is used for judging whether the voltage and the ambient temperature of each single battery cell meet preset thermal runaway conditions or not to obtain a judgment result, and generating a control instruction when the judgment result shows that a target single battery cell meets the preset thermal runaway conditions; the thermal runaway control module is used for controlling the cooling mechanism to perform cooling operation on the target single battery cell based on the control instruction; the cooling mechanism is connected with the battery pack, and then monitors the voltage and the ambient temperature of each single battery cell, and starts cooling measures as early as possible when the single battery cell is about to generate thermal runaway, so as to actively prevent the thermal runaway and ensure the safety of the battery pack.
Example two
Based on the same inventive concept, the present invention also provides a method for preventing thermal runaway, as shown in fig. 3, comprising:
s301, acquiring the voltage and the ambient temperature of the single battery cell in each battery module in the battery pack;
s302, judging whether the voltage and the ambient temperature of each single battery cell meet the set thermal runaway condition to obtain a judgment result;
and S303, generating a control instruction to control a cooling mechanism connected with the battery pack to perform cooling operation on the target single battery cell when the judgment result shows that the target single battery cell meets a preset thermal runaway condition.
In an alternative embodiment, the preset thermal runaway condition comprises:
the voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the highest temperature around the single battery cell is larger than a preset temperature, and the duration time reaches a second preset time; or alternatively
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature difference around the single battery cell is larger than a preset temperature difference, and the duration time reaches a second preset time; or
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature change rate around the single battery cell is larger than a preset rate, and the duration time is larger than a second preset time; or
The maximum temperature around the single battery cell is greater than the preset temperature, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The voltage of the single battery cell is smaller than the preset voltage, the duration time reaches a first preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The temperature difference around the single battery cell is larger than the preset temperature difference, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is larger than or equal to 1; or alternatively
The number of failures of the temperature sensors is greater than or equal to 2, and the number of failures of the voltage sampling lines of the single battery cells is greater than or equal to 1.
In an optional implementation manner, after generating a control instruction to control the temperature reduction mechanism connected to the battery pack to perform a temperature reduction operation on the target individual electric core, the method further includes:
and judging whether the voltage and the ambient temperature of the target single battery cell meet preset cooling stopping conditions, if so, generating a dormancy signal, and controlling the cooling mechanism to stop cooling operation.
In an alternative embodiment, the cooling-down-stop condition includes:
the voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the highest temperature around the single battery cell is smaller than the preset temperature, and the duration time reaches a fourth preset time; or
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature change rate around the single battery cell is smaller than a preset rate, and the duration time reaches a fourth preset time; or
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature difference around the single battery cell is smaller than the preset temperature difference, and the duration time reaches a fourth preset time; or
The maximum temperature around the single battery cell is smaller than the preset temperature, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or
The single battery cell is in a normal voltage range, the duration time reaches a third preset time, and meanwhile the number of faults of a voltage sampling circuit of the single battery cell is 0; or
The temperature difference around the single battery cell is smaller than the preset temperature difference, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or
The failure number of the temperature sensors is less than or equal to 1, and the failure number of the voltage sampling circuit of the single battery cell is 0.
In an optional embodiment, each individual cell has a unique identification code, and after determining that the voltages and ambient temperatures of the individual cells satisfy the preset thermal runaway condition, the method further includes: determining coordinates of a target single battery cell, wherein the coordinates are unique identification codes corresponding to the target single battery cell; and generating a control instruction based on the coordinates of the target single battery cell.
In an optional embodiment, the controlling the temperature reduction mechanism connected to the battery pack to perform a temperature reduction operation on the target individual electric core includes:
the method comprises the steps of controlling a high-pressure gas generating device to generate high-pressure gas, separating the high-pressure gas into cold air flows through a turbine pipe, conveying the cold air flows to corresponding battery modules through gas conveying pipes, and when corresponding electromagnetic valves are opened, achieving cooling operation of the battery modules where target single battery cores are located.
EXAMPLE III
Based on the same inventive concept, an embodiment of the present invention further provides an apparatus for preventing thermal runaway, as shown in fig. 4, including:
the acquiring module 401 is configured to acquire voltages and ambient temperatures of individual battery cells in each battery module in the battery pack;
a determining module 402, configured to determine whether the voltage and the ambient temperature of each individual battery cell meet a set thermal runaway condition, so as to obtain a determination result;
and the control module 403 is configured to generate a control instruction to control the cooling mechanism connected to the battery pack to perform a cooling operation on the target single battery cell when the determination result indicates that the target single battery cell meets a preset thermal runaway condition.
In an alternative embodiment, the preset thermal runaway condition comprises:
the voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the highest temperature around the single battery cell is larger than a preset temperature, and the duration time reaches a second preset time; or
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature difference around the single battery cell is larger than a preset temperature difference, and the duration time reaches a second preset time; or
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature change rate around the single battery cell is larger than a preset rate, and the duration time is larger than a second preset time; or
The maximum temperature around the single battery cell is greater than the preset temperature, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The voltage of the single battery cell is smaller than the preset voltage, the duration time reaches a first preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The temperature difference around the single battery cell is larger than the preset temperature difference, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is larger than or equal to 1; or
The number of failures of the temperature sensors is greater than or equal to 2, and the number of failures of the voltage sampling lines of the single battery cells is greater than or equal to 1.
In an optional embodiment, the method further comprises: and the stopping control module is used for generating a control instruction so as to judge whether the voltage and the ambient temperature of the target monomer battery cell meet the preset stopping cooling condition or not after the cooling mechanism connected with the battery pack is controlled to perform cooling operation on the target monomer battery cell, if so, generating a dormancy signal and controlling the cooling mechanism to stop the cooling operation.
In an alternative embodiment, the cooling-down-stop condition includes:
the voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the highest temperature around the single battery cell is smaller than the preset temperature, and the duration time reaches a fourth preset time; or alternatively
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature change rate around the single battery cell is smaller than a preset rate, and the duration time reaches a fourth preset time; or
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature difference around the single battery cell is smaller than the preset temperature difference, and the duration time reaches a fourth preset time; or
The maximum temperature around the single battery cell is smaller than the preset temperature, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or
The single battery cell is in a normal voltage range, the duration time reaches a third preset time, and meanwhile the number of faults of a voltage sampling circuit of the single battery cell is 0; or
The temperature difference around the single battery cell is smaller than the preset temperature difference, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or alternatively
The failure number of the temperature sensors is less than or equal to 1, and the failure number of the voltage sampling circuit of the single battery cell is 0.
In an optional embodiment, each individual cell has a unique identification code, and further includes: the determining module is used for determining the coordinates of the target single battery cell after the voltage and the ambient temperature of the single battery cell are determined to meet the preset thermal runaway condition, wherein the coordinates are the unique identification code corresponding to the target single battery cell; and generating a control instruction based on the coordinates of the target single battery cell.
In an optional implementation manner, the control module is specifically configured to:
and controlling a high-pressure gas generating device to generate high-pressure gas, separating the high-pressure gas into cold air flow through a turbine pipe, conveying the cold air flow to the corresponding battery module through a gas conveying pipe, and opening a corresponding electromagnetic valve to realize the cooling operation of the battery module where the target single battery core is positioned.
Example four
Based on the same inventive concept, an embodiment of the present invention provides a new energy automobile, as shown in fig. 5, including a memory 504, a processor 502, and a computer program stored on the memory 504 and operable on the processor 502, where the processor 502 implements the steps of the method for preventing thermal runaway described above when executing the program.
Where in fig. 5 a bus architecture (represented by bus 500) is shown, bus 500 may include any number of interconnected buses and bridges, and bus 500 links together various circuits including one or more processors, represented by processor 502, and memory, represented by memory 504. The bus 500 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 506 provides an interface between the bus 500 and the receiver 501 and transmitter 503. The receiver 501 and the transmitter 503 may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 502 is responsible for managing the bus 500 and general processing, and the memory 504 may be used for storing data used by the processor 502 in performing operations.
EXAMPLE five
Based on the same inventive concept, embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the above-mentioned method for preventing thermal runaway.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose systems may also be used with the teachings herein. The required structure for constructing such a system will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It will be understood by those skilled in the art that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in an apparatus for preventing thermal runaway, a new energy automobile, or a new energy automobile according to an embodiment of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (10)
1. The utility model provides a system for prevent thermal runaway connects the battery package, the battery package includes a plurality of battery modules, and every battery module includes a plurality of monomer electricity cores, its characterized in that includes:
an acquisition module comprising: the battery module comprises a voltage sampling circuit corresponding to each single battery cell and a plurality of temperature sensors positioned in each battery module, and is used for acquiring the voltage and the ambient temperature of each single battery cell;
the controller is used for judging whether the voltage and the ambient temperature of each single battery cell meet preset thermal runaway conditions or not, obtaining a judgment result, and generating a control instruction when the judgment result shows that a target single battery cell meets the preset thermal runaway conditions;
the thermal runaway control module is used for controlling the cooling mechanism to perform cooling operation on the target single battery cell based on the control instruction;
and the cooling mechanism is connected with the battery pack.
2. The system of claim 1, wherein the preset thermal runaway condition comprises:
the voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the highest temperature around the single battery cell is larger than a preset temperature, and the duration time reaches a second preset time; or
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature difference around the single battery cell is larger than a preset temperature difference, and the duration time reaches a second preset time; or
The voltage of the single battery cell is smaller than a preset voltage, the duration time reaches a first preset time, meanwhile, the temperature change rate around the single battery cell is larger than a preset rate, and the duration time is larger than a second preset time; or alternatively
The maximum temperature around the single battery cell is greater than the preset temperature, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The voltage of the single battery cell is smaller than the preset voltage, the duration time reaches a first preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is greater than or equal to 1; or
The temperature difference around the single battery cell is larger than the preset temperature difference, the duration time reaches a second preset time, and the number of faults occurring on the voltage sampling circuit of the single battery cell is larger than or equal to 1; or
The number of failures of the temperature sensors is greater than or equal to 2, and the number of failures of the voltage sampling lines of the single battery cells is greater than or equal to 1.
3. The system of claim 1, wherein the controller is further to:
judging whether the voltage and the ambient temperature of the target single battery cell meet preset cooling stopping conditions or not, and if so, generating a sleep signal;
the thermal runaway control module is further used for controlling the cooling mechanism to stop cooling operation based on the dormancy signal.
4. The system of claim 3, wherein the stop cool down condition comprises:
the voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the highest temperature around the single battery cell is smaller than the preset temperature, and the duration time reaches a fourth preset time; or
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature change rate around the single battery cell is smaller than a preset rate, and the duration time reaches a fourth preset time; or
The voltage of the single battery cell is in a normal voltage range, the duration time reaches a third preset time, meanwhile, the temperature difference around the single battery cell is smaller than the preset temperature difference, and the duration time reaches a fourth preset time; or
The maximum temperature around the single battery cell is smaller than the preset temperature, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or alternatively
The single battery cell is in a normal voltage range, the duration time reaches a third preset time, and meanwhile the number of faults of a voltage sampling circuit of the single battery cell is 0; or alternatively
The temperature difference around the single battery cell is smaller than the preset temperature difference, the duration time reaches a fourth preset time, and meanwhile the number of faults of the voltage sampling circuit of the single battery cell is 0; or
The failure number of the temperature sensors is less than or equal to 1, and the failure number of the voltage sampling circuit of the single battery cell is 0.
5. The system of claim 1, wherein each individual cell has a unique identification code, the controller further to:
determining a coordinate of a target monomer battery cell after determining that the voltage and the ambient temperature of the target monomer battery cell meet a preset thermal runaway condition, wherein the coordinate is a unique identification code corresponding to the target monomer battery cell;
and generating a control instruction based on the coordinates of the target single battery cell.
6. The system of claim 5, wherein the cooling mechanism comprises:
a high-pressure gas generating device for generating high-pressure gas;
a turbine tube for separating the high pressure gas into a cold gas stream;
the air delivery pipe corresponds to each battery module and is used for delivering the cold air flow to the corresponding battery module;
the electromagnetic valve is arranged on the air outlet branch of the air delivery pipe, and the electromagnetic valve is opened to realize the cooling operation of the battery module where the target single battery cell is located.
7. A method of preventing thermal runaway, comprising:
acquiring the voltage and the ambient temperature of the single battery cell in each battery module in the battery pack;
judging whether the voltage and the ambient temperature of each single battery cell meet the set thermal runaway condition or not to obtain a judgment result;
and generating a control instruction to control a cooling mechanism connected with a battery pack to perform cooling operation on the target single battery cell when the judgment result shows that the target single battery cell meets a preset thermal runaway condition.
8. An apparatus for preventing thermal runaway, comprising:
the acquisition module is used for acquiring the voltage and the ambient temperature of the single battery cell in each battery module in the battery pack;
the judgment module is used for judging whether the voltage and the ambient temperature of each single battery cell meet the set thermal runaway condition or not to obtain a judgment result;
and the control module is used for generating a control instruction when the judgment result shows that the target single battery cell meets a preset thermal runaway condition so as to control the cooling mechanism connected with the battery pack to perform cooling operation on the target single battery cell.
9. A new energy vehicle comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method steps as claimed in claim 7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method steps as claimed in claim 7.
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| CN202210705324.XA CN115064817A (en) | 2022-06-21 | 2022-06-21 | Method, device and system for preventing thermal runaway |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116435641A (en) * | 2023-04-28 | 2023-07-14 | 合肥国轩高科动力能源有限公司 | Method for identifying internal temperature of energy storage battery |
| CN117199613A (en) * | 2023-09-18 | 2023-12-08 | 浙江启辰新能科技有限公司 | Thermal runaway cooling method of energy storage battery and energy storage battery |
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2022
- 2022-06-21 CN CN202210705324.XA patent/CN115064817A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116435641A (en) * | 2023-04-28 | 2023-07-14 | 合肥国轩高科动力能源有限公司 | Method for identifying internal temperature of energy storage battery |
| CN117199613A (en) * | 2023-09-18 | 2023-12-08 | 浙江启辰新能科技有限公司 | Thermal runaway cooling method of energy storage battery and energy storage battery |
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