CN116001643A - Battery protection method and device - Google Patents
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- CN116001643A CN116001643A CN202211729884.5A CN202211729884A CN116001643A CN 116001643 A CN116001643 A CN 116001643A CN 202211729884 A CN202211729884 A CN 202211729884A CN 116001643 A CN116001643 A CN 116001643A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004590 computer program Methods 0.000 claims description 12
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- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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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
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- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The application relates to a battery protection method and device. The method comprises the following steps: the battery management system acquires the residual battery capacity and the actual discharge power; determining whether the current battery is in a low-power state according to the residual power of the battery; if yes, determining a current low-power level and a preset power threshold corresponding to the low-power level; if the actual discharge power is lower than the preset power threshold corresponding to the low-power level, and the duration is longer than the preset time; and the whole vehicle controller executes the low-power protection measures corresponding to the low-power level. And the residual battery power and the actual discharge power are used as the judging basis for starting the low-power protection of the power battery pack, and according to the condition of the residual battery power, the whole vehicle controller is enabled to execute the low-power protection measures corresponding to the low-power level, so that the battery protection of the electric vehicle in the dynamic and static states of the vehicle is ensured.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a battery protection method and device.
Background
Due to the shortage of energy and the increasing environmental pollution caused by fuel automobiles, electric automobiles are receiving more and more attention to the advantages of saving fuel energy, reducing exhaust emission, having high efficiency, low noise and the like. The power battery is used as an important energy storage element of the electric battery to provide power for the electric automobile. However, when the remaining battery power (SOC) is low, the battery is liable to be depleted, which results in a shortened service life Of the battery and even a short-circuit runaway Of the battery.
Therefore, how to solve the problem of shortening the service life of the battery due to the battery depletion caused by the lower SOC is also a problem to be solved by those skilled in the art.
Disclosure of Invention
Based on the method and the device, the problem of shortened service life of the battery caused by battery depletion when the SOC is low is solved.
In one aspect, a battery protection method is provided, and the battery protection method is applied to an electric automobile, and is characterized in that the battery protection method includes:
the battery management system acquires the residual battery capacity and the actual discharge power;
determining whether the current battery is in a low-power state according to the residual power of the battery;
if yes, determining a current low-power level and a preset power threshold corresponding to the low-power level;
if the actual discharge power is lower than the preset power threshold corresponding to the low-power level, and the duration is longer than the preset time;
and the whole vehicle controller executes the low-power protection measures corresponding to the low-power level.
Optionally, the mathematical expression of the remaining battery power is:
wherein SOC is the residual electric quantity of the battery, P is the allowable discharge power of the battery, U is the actual total voltage of the battery, qn is the rated capacity of the battery, n is the electric quantity of the battery after charging, and 1 is more than or equal to n > 0.
Optionally, the executing, by the vehicle controller, the low-power protection measure corresponding to the low-power level includes:
the vehicle controller performs information pushing, wherein the information pushing at least comprises one of the following steps:
setting a battery power progress bar to be a color corresponding to the low power level;
the popup window is used for displaying prompt information corresponding to the low-power level;
and broadcasting voice information corresponding to the low-power level.
Optionally, the executing, by the vehicle controller, the low-power protection measure corresponding to the low-power level includes:
and if the low-power level is in the lowest power state, the whole vehicle controller powers down the electric vehicle and sets a low-power protection zone bit.
Optionally, if the low power level is in the lowest power state, the whole vehicle controller powers down the electric vehicle, sets a low power protection flag bit, and then includes:
when the battery management system receives a charging request, judging whether the battery management system can be electrified;
if yes, eliminating the low-power protection zone bit;
if not, the low-power protection zone bit is maintained.
Optionally, the vehicle controller executes the low-power protection measure corresponding to the low-power level, and further includes:
collecting the speed of the electric automobile and the gear of the electric automobile;
when the vehicle speed is greater than 0 and the gear is in a non-parking gear;
and correspondingly limiting the vehicle speed according to the low power level.
Optionally, determining the current low-power level and a preset power threshold corresponding to the low-power level, and then further includes:
when the residual electric quantity is in the highest electric quantity state and the actual discharge power is larger than the preset power threshold value;
and the whole vehicle controller does not execute the low-power protection measures corresponding to the low-power level.
The present invention provides a battery protection device, comprising: a battery management system and a whole vehicle controller, wherein,
the battery management system acquires the residual battery capacity and the actual discharge power; determining whether the current battery is in a low-power state according to the residual power of the battery; if yes, determining a current low-power level and a preset power threshold corresponding to the low-power level; if the actual discharge power is lower than the preset power threshold corresponding to the low-power level, and the duration is longer than the preset time;
and the whole vehicle controller executes the low-power protection measures corresponding to the low-power level.
The present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the methods when the computer program is executed.
The present invention provides an electronically readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of any of the methods.
According to the battery protection method and device, the residual battery power and the actual discharge power are used as the judgment basis for starting the low-power protection of the power battery pack, and the whole vehicle controller is enabled to execute the low-power protection measures corresponding to the low-power level according to the condition of the residual battery power, so that the battery protection of the electric vehicle in the dynamic and static states of the vehicle is ensured.
Drawings
FIG. 1 is a flow chart of a method of battery protection in one embodiment;
FIG. 2 is a flow chart of a method of battery protection in one embodiment;
FIG. 3 is an internal block diagram of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The power battery pack is a main energy storage element Of the whole vehicle, and is easy to be deficient when the residual capacity (SOC) Of the battery is low, the service life Of the power battery pack is shortened due to the deficiency Of the power battery pack, and the copper precipitation internal short circuit thermal runaway is caused when the power battery pack is severe, so that the power battery pack is irreversibly damaged, and the method has important significance for preventing the power battery from being deficient. At present, when the vehicle is stopped and is not in a low-power protection state, the use of the power consumption function is limited according to different power amounts to prevent the battery from being overdischarged. However, there may be a failure of protection when the vehicle is dynamic, and there may still be a problem of the power battery discharging to a power shortage state when the vehicle is stopped.
Based on this, as shown in fig. 1, there is provided a battery protection method applied to an electric vehicle, characterized in that the battery protection method includes:
s1: the battery management system acquires the residual battery capacity and the actual discharge power;
s2: determining whether the current battery is in a low-power state according to the residual power of the battery;
s3: if yes, determining a current low-power level and a preset power threshold corresponding to the low-power level;
s4: if the actual discharge power is lower than the preset power threshold corresponding to the low-power level, and the duration is longer than the preset time;
s5: and the whole vehicle controller executes the low-power protection measures corresponding to the low-power level.
Illustratively, in step S1, the battery remaining power and the actual photoelectric power of the power battery pack are obtained by the battery management system (Battery Management System, BMS), and if the battery remaining power is low, the low-power protection of the power battery pack may be started to avoid the failure of the protection when the battery is low due to the low power of the power battery pack or the dynamic state of the vehicle, and the actual discharge power of the power battery pack changes along with the change of the battery remaining power, when the actual discharge power is low, the damage of the power battery pack may be caused, so that it is necessary to collect the battery remaining power by the battery management system and collect the actual discharge power as the basis for determining the low-power protection opportunity.
Illustratively, in step S2, a low battery determination threshold may be set, and the remaining battery power is compared with the determination threshold to determine that the current remaining battery power is in a low battery state, for example, the determination threshold may be set to 30%, 20%, 15% or other of the full charge.
In some implementation processes of step S3, when the power of the power battery pack is in a low power state, the degree of the low power is further determined, and the current remaining power of the battery may be compared with a preset low power level to determine the low power level and a preset power threshold corresponding to the low power level.
In step S4, the actual discharge power is compared with a preset power threshold, and if the actual discharge power is lower than the preset power threshold corresponding to the low battery level and the duration is longer than a preset time, the actual discharge power is used as an on node for low battery protection of the power battery pack.
Illustratively, in step S5, different low-power protection measures may be preset for different levels of power, when: 1. the current low power level; 2. and when the actual discharge power is lower than a preset power threshold corresponding to the low-power level and the duration time is longer than a preset time, the whole vehicle controller executes the low-power protection measures corresponding to the low-power level.
According to the battery protection method, the residual battery power and the actual discharge power are used as the judgment basis for starting the low-power protection of the power battery pack, and according to the condition of the residual battery power, the whole vehicle controller is enabled to execute the low-power protection measures corresponding to the low-power level, so that the battery protection of the electric vehicle in the dynamic and static states of the vehicle is ensured.
In some implementations, the battery remaining power needs to be estimated by the BMS system, for example, the mathematical expression of the battery remaining power is:
the SOC is the remaining battery power, P is the allowable discharge power of the battery, U is the actual total voltage of the battery, qn is the rated capacity of the battery, n is the charged battery power, and 1 is greater than or equal to n > 0, for example, when n=1, it represents that the power battery pack starts to consume power from full power, and when n=0.5, it represents that the power battery pack starts to consume power from 50% power.
When the electric quantity of the power battery pack is too low, information prompt is needed to be carried out on the vehicle owner so as to avoid further consumption of the electric quantity of the power battery pack, for example, the vehicle controller executes the low-electric-quantity protection measures corresponding to the low-electric-quantity level, and the method comprises the following steps:
the vehicle controller performs information pushing, wherein the information pushing at least comprises one of the following steps:
setting a battery power progress bar to be a color corresponding to the low power level;
the popup window is used for displaying prompt information corresponding to the low-power level;
and broadcasting voice information corresponding to the low-power level.
The information pushing can be performed in one mode, and the combination selection can also be performed according to the low-power level of the power battery pack.
For example, the low-power level may be divided into a plurality of levels, and the number of levels may be increased or decreased according to the actual situation, for example, the low-power level may be configured as 3 levels, that is: the first level is when the remaining battery power is 5% -10%, the second level is when the remaining battery power is 2% -5%, and the third level is when the remaining battery power is less than or equal to 2%.
When the vehicle is stationary, the whole vehicle controller sets the low-power level as a first level, and the signal received by the battery management system by the whole vehicle controller is' 0x1: when the Level is 1', the battery electric quantity progress bar is displayed as amber, and an electric quantity low alarm indicator lamp is lightened; the instrument spring frame prompts "battery low-! The method comprises the steps of' prompting a graphical user interface and prompting voice, displaying for 5 seconds, enabling a popup frame to disappear after 5 seconds, performing voice prompt once, enabling prompt contents to be consistent with prompt contents of an instrument popup window, and restoring a battery electric quantity progress bar to be green for display and simultaneously extinguishing a power battery electric quantity low alarm indicator when a battery management system receives a normal electric quantity signal of a vehicle controller; the whole vehicle controller sets the low-power level as a second level, and the signal received by the battery management system by the whole vehicle controller is' 0x2: when the Level is 2', the battery electric quantity progress bar is displayed to be dark yellow, and an electric quantity low alarm indicator lamp is lightened; the instrument spring frame prompts the battery power to be extremely low-! The method comprises the steps of' prompting a graphical user interface and prompting voice, displaying for 5 seconds, enabling a popup frame to disappear after 5 seconds, performing voice prompt once, enabling prompt contents to be consistent with prompt contents of an instrument popup window, and restoring a battery electric quantity progress bar to be green for display and simultaneously extinguishing a power battery electric quantity low alarm indicator when a battery management system receives a normal electric quantity signal of a vehicle controller; the whole vehicle controller sets the low-power level as a second level, and the signal received by the battery management system by the whole vehicle controller is' 0x3: when the Level is 3', the battery electric quantity progress bar is displayed in red, and an electric quantity low alarm indicator lamp is lightened; the instrument spring frame prompts that the power is about to be lost, the driver waits for rescue when parking-! The graphic user interface prompt and the voice prompt are displayed for 5 seconds, the popup frame disappears after 5 seconds, the prompt content is consistent with the instrument popup window prompt content, and when the battery management system receives a normal electric quantity signal of the whole vehicle controller, the battery electric quantity progress bar is restored to green display and meanwhile the power battery electric quantity low alarm indicator lamp is turned off.
In order to further protect the power battery pack, avoid the damage, also avoid when the battery residual capacity is extremely low, the electric quantity of power battery pack is depleted rapidly, and whole vehicle controller carries out the low electric quantity protection measure that low electric quantity level corresponds includes:
and if the low-power level is in the lowest power state, the whole vehicle controller powers down the electric vehicle and sets a low-power protection zone bit. For example, when the whole vehicle controller sets the low battery level to be the third level and the remaining battery level is lower than 2%, the whole vehicle controller prohibits the load power of other non-power-domain high-voltage accessories, stops the vehicle power after a certain duration, and powers down the electric vehicle, and sets the electric vehicle to be a low battery protection mark so as to carry out information prompt when the electric vehicle is restarted or is plugged into a charging gun for charging, thereby avoiding damage to a power battery pack.
In some implementations, if the low battery level is in the lowest battery state, the whole vehicle controller powers down the electric vehicle and sets a low battery protection flag bit, and then includes:
when the battery management system receives a charging request, judging whether the battery management system can be electrified;
if yes, eliminating the low-power protection zone bit;
if not, the low-power protection zone bit is maintained. For example, the battery management system detects the following status of the power battery pack when detecting a power-up request from a user:
1. discharge average current <3A;
2. and if the battery is in an uncharged (including feedback) state, the low-power protection zone bit is kept, and log recording is carried out.
Detecting the following states of the power battery pack:
1. the minimum voltage of the battery is less than or equal to the open circuit voltage;
2. and if the duration exceeds two minutes, triggering the power battery pack to run out of the electric quantity, and recording the log.
In some implementations, low-power protection is further required for the power battery pack when the vehicle is in motion, for example, as shown in fig. 2, the vehicle controller executes the low-power protection measures corresponding to the low-power level, and further includes:
s51: collecting the speed of the electric automobile and the gear of the electric automobile;
s52: when the vehicle speed is greater than 0 and the gear is in a non-parking gear;
s53: and correspondingly limiting the vehicle speed according to the low power level.
In step S51, a vehicle dynamics is determined from the vehicle speed of the electric vehicle and the gear of the electric vehicle.
In step S52, if the vehicle speed of the electric vehicle is greater than 0 and the gear is the non-park gear, it is determined that the vehicle is in motion.
In step S53, a low battery level may be determined when the vehicle is dynamic, and the vehicle speed may be limited accordingly, for example, the maximum vehicle speed is limited to 80km/h when the vehicle is in the first level, 40km/h when the vehicle is in the second level, and 20km/h when the vehicle is in the third level.
In the use of electric vehicles, the energy consumption of the devices related to the power domain controller or the cabin domain controller is relatively high, so, in order to optimize the low-power protection of the power battery pack and avoid rapid power shortage, in some implementations, the power use of some devices can be limited, for example, the electric power used by the non-power domain high-voltage accessories can be limited at the second level, and for example, the load power of other non-power domain high-voltage accessories can be forbidden at the third level, and the vehicle power is stopped after a certain duration.
Because the estimation of the remaining battery power is limited by many factors, and in order to avoid that the low-power protection of the power battery pack is wrongly started to affect the user experience, in some implementation processes, determining the current low-power level and the preset power threshold corresponding to the low-power level further includes:
when the residual electric quantity is in the highest electric quantity state and the actual discharge power is larger than the preset power threshold value;
and the whole vehicle controller does not execute the low-power protection measures corresponding to the low-power level.
For example, although the remaining power is higher and is in the highest state of charge in the low power level, the actual discharge power of the power battery pack is larger, and the discharge power of the power battery pack is not attenuated, the low power protection of the power battery pack may be delayed to be started and not executed, and when the actual discharge power is greater than the preset power threshold, the low power protection of the power battery pack may be started. And the system error caused by the display deviation of the residual electric quantity of the battery is avoided, so that the low-electric-quantity protection measures are started in advance and the use experience of the user is influenced.
The present invention provides a battery protection device, comprising: a battery management system and a whole vehicle controller, wherein,
the battery management system acquires the residual battery capacity and the actual discharge power; determining whether the current battery is in a low-power state according to the residual power of the battery; if yes, determining a current low-power level and a preset power threshold corresponding to the low-power level; if the actual discharge power is lower than the preset power threshold corresponding to the low-power level, and the duration is longer than the preset time;
and the whole vehicle controller executes the low-power protection measures corresponding to the low-power level.
The battery protection device is used as an execution carrier for battery protection, residual battery power and actual discharge power are used as judgment bases for starting the low-power protection of the power battery pack, and according to the condition of the residual battery power, the whole vehicle controller is enabled to execute low-power protection measures corresponding to the low-power level, so that the battery protection of the electric vehicle in the dynamic and static states of the vehicle is ensured.
The present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the methods when the computer program is executed.
The present invention provides an electronically readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of any of the methods.
It will be appreciated by those skilled in the art that the structure shown in fig. 3 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchi nk) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A battery protection method applied to an electric automobile, the battery protection method comprising:
the battery management system acquires the residual battery capacity and the actual discharge power;
determining whether the current battery is in a low-power state according to the residual power of the battery;
if yes, determining a current low-power level and a preset power threshold corresponding to the low-power level;
if the actual discharge power is lower than the preset power threshold corresponding to the low-power level, and the duration is longer than the preset time;
and the whole vehicle controller executes the low-power protection measures corresponding to the low-power level.
2. The battery protection method according to claim 1, wherein the mathematical expression of the remaining battery power is:
wherein SOC is the residual electric quantity of the battery, P is the allowable discharge power of the battery, U is the actual total voltage of the battery, qn is the rated capacity of the battery, n is the electric quantity of the battery after charging, and 1 is more than or equal to n > 0.
3. The battery protection method according to claim 1, wherein the vehicle controller executes the low-power protection measure corresponding to the low-power level, including:
the vehicle controller performs information pushing, wherein the information pushing at least comprises one of the following steps:
setting a battery power progress bar to be a color corresponding to the low power level;
the popup window is used for displaying prompt information corresponding to the low-power level;
and broadcasting voice information corresponding to the low-power level.
4. The battery protection method according to claim 1, wherein the vehicle controller executes the low-power protection measure corresponding to the low-power level, including:
and if the low-power level is in the lowest power state, the whole vehicle controller powers down the electric vehicle and sets a low-power protection zone bit.
5. The battery protection method according to claim 4, wherein if the low battery level is in a lowest battery state, the vehicle controller powers down the electric vehicle and sets a low battery protection flag bit, and then includes:
when the battery management system receives a charging request, judging whether the battery management system can be electrified;
if yes, eliminating the low-power protection zone bit;
if not, the low-power protection zone bit is maintained.
6. The battery protection method according to any one of claims 1 to 5, wherein the vehicle controller executes the low-power protection measure corresponding to the low-power level, further comprising:
collecting the speed of the electric automobile and the gear of the electric automobile;
when the vehicle speed is greater than 0 and the gear is in a non-parking gear;
and correspondingly limiting the vehicle speed according to the low power level.
7. The battery protection method of claim 1, wherein determining a current low battery level and a preset power threshold corresponding to the low battery level further comprises:
when the residual electric quantity is in the highest electric quantity state and the actual discharge power is larger than the preset power threshold value;
and the whole vehicle controller does not execute the low-power protection measures corresponding to the low-power level.
8. A battery protection device, characterized in that the battery protection device comprises: a battery management system and a whole vehicle controller, wherein,
the battery management system acquires the residual battery capacity and the actual discharge power; determining whether the current battery is in a low-power state according to the residual power of the battery; if yes, determining a current low-power level and a preset power threshold corresponding to the low-power level; if the actual discharge power is lower than the preset power threshold corresponding to the low-power level, and the duration is longer than the preset time;
and the whole vehicle controller executes the low-power protection measures corresponding to the low-power level.
9. An electronic device 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 steps of the method of any one of claims 1 to 7 when the computer program is executed by the processor.
10. An electronically readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the method of any of claims 1 to 7.
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| CN202211729884.5A CN116001643A (en) | 2022-12-30 | 2022-12-30 | Battery protection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117277479A (en) * | 2023-09-06 | 2023-12-22 | 成都华储卡电新能源科技有限公司 | Battery under-voltage management device and battery under-voltage management method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117277479A (en) * | 2023-09-06 | 2023-12-22 | 成都华储卡电新能源科技有限公司 | Battery under-voltage management device and battery under-voltage management method |
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