Battery low-voltage protection methods, devices and media

Abstract

The present invention discloses a method, device and medium for low-battery protection, the method comprising: obtaining the historical maximum starting current of the engine, and detecting the real-time battery power of the battery; obtaining a pre-stored battery characteristic table, the battery characteristic table containing a mapping relationship between the battery power of the battery and the maximum instantaneous discharge current; screening the maximum instantaneous discharge current higher than the historical maximum starting current from the battery characteristic table, and forming a set of battery power corresponding to the maximum instantaneous discharge current, taking the battery power with the smallest value from the set as the target power; when the real-time battery power is lower than the target power, cutting off the power supply coupling between the battery and the vehicle's external equipment. The present invention calculates the target power in real time through the historical maximum starting current of the engine and the pre-stored battery characteristic table, and when the real-time battery power is lower than the target power, immediately cutting off the power supply coupling between the battery and the vehicle's external equipment, which can effectively slow down the battery's self-consumption.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle starting power supply, and in particular to a method, device and medium for protecting a battery from low power. Background Art

[0002] Lead-acid batteries are widely used in car batteries, motorcycles, lawn mowers, motorboats and skis for starting equipment and powering external electronic devices.

[0003] When a car has been left unused for a long time, the lead-acid battery will run out of power, making it impossible to start the car. At this time, the user can only call for an emergency starting power supply to connect to the power, which causes great trouble to the user. The reason is that the electronic equipment outside the car (such as the anti-theft system and remote control system) will still consume electricity after the car is turned off. When the car is not started, the engine cannot charge the battery. The peripherals will gradually drain the battery power, and the battery itself also has the phenomenon of self-discharge. When the battery voltage is lower than the ignition voltage (the battery power is related to the ignition voltage), the engine will fail to ignite.

[0004] The existing technology cannot circumvent the problem that the lead-acid battery needs to continue to power peripherals after the car is turned off, so the solution is more focused on the miniaturization of the emergency starting power supply, so that users can more easily accept the emergency starting power supply as a backup device placed in the car. The above emergency power supply connection method is a remedial measure after the battery power drops below the ignition voltage. Moreover, not every user will equip the car with an emergency starting power supply. If the emergency power supply cannot be found in time to jump-charge the battery in extremely harsh environments, the user's life safety cannot be guaranteed. Summary of the invention

[0005] In view of the above problems, the present invention proposes a method, device and medium for low-battery protection, aiming to reduce the self-consumption of battery.

[0006] In order to solve the above technical problems, the first aspect of the present invention provides a low-battery protection method, comprising the following steps:

[0007] Obtain the historical maximum starting current of the engine and detect the real-time battery power of the battery;

[0008] Acquire a pre-stored battery characteristic table, wherein the battery characteristic table at least includes a mapping relationship between the battery power and the maximum instantaneous discharge current of the battery;

[0009] Globally screening each of the maximum instantaneous discharge currents higher than the historical maximum starting current from the battery characteristic table, and forming a set of the battery power corresponding to each of the screened maximum instantaneous discharge currents, and taking the battery power with the smallest value from the set as the target power;

[0010] In some implementations, when the real-time battery power level is lower than the target power level, the power coupling between the battery and the vehicle external device is cut off.

[0011] In some implementations, after taking the battery power with the smallest value from the set as the target power, the target power is updated in a preset manner.

[0012] The preset method includes: adding a preset power value to the target power to form an updated target power, and comparing the updated target power with the real-time battery power based on the updated target power.

[0013] In some embodiments, the battery characteristic table includes a mapping relationship between battery power, battery voltage, discharge rate, and maximum instantaneous discharge current.

[0014] In some implementations, the battery capacities in the battery characteristics table are all integer multiples of 10.

[0015] In some implementations, the maximum instantaneous discharge current is calculated by obtaining a maximum discharge current allowed by the battery, and calculating the maximum instantaneous discharge current according to the product of the maximum discharge current and the corresponding discharge rate.

[0016] In some implementations, the battery characteristic table is tested, calculated, and edited based on physical parameters of the battery, and written into a register attached to the battery.

[0017] In some implementations, the battery characteristics table is not modifiable.

[0018] The second aspect of the present invention provides a low-battery protection device, comprising:

[0019] The engine starting current acquisition unit is used to obtain the historical maximum starting current of the engine.

[0020] A battery power acquisition unit, used to detect the real-time battery power of the battery;

[0021] A battery characteristic table acquisition unit, used to acquire a pre-stored battery characteristic table, wherein the battery characteristic table at least includes a mapping relationship between the battery power and the maximum instantaneous discharge current of the battery;

[0022] a target power calculation unit, which globally selects each of the maximum instantaneous discharge currents higher than the historical maximum starting current from the battery characteristic table, and forms a set of the battery power corresponding to each of the maximum instantaneous discharge currents obtained by the selection, and takes the battery power with the smallest value from the set as the target power;

[0023] A power cut-off unit is configured to cut off the power supply coupling between the storage battery and the vehicle external device when the real-time battery power level is lower than the target power level.

[0024] A third aspect of the present invention provides a computer storable medium storing computer instructions, which, when called, are used to execute the above-mentioned low-battery protection method.

[0025] The beneficial effects of the present invention are as follows: the target power is calculated in real time through the historical maximum starting current of the engine and the pre-stored battery characteristic table. When the real-time battery power of the battery is lower than the target power, the power supply coupling between the battery and the vehicle's external equipment is immediately cut off, which can effectively reduce the battery's self-consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a flow chart of a low-battery protection method disclosed in Embodiment 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a low-battery protection device disclosed in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer and more specific, the content of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all the contents.

[0029] Embodiment 1

[0030] This embodiment proposes a battery low-power protection method, which calculates the target power in real time through the historical maximum starting current of the engine and a pre-stored battery characteristic table. When the real-time battery power of the battery is lower than the target power, the power supply coupling between the battery and the vehicle's external equipment is immediately cut off, which can effectively reduce the battery's self-consumption.

[0031] like Figure 1 As shown, the method comprises the following steps S1-S4:

[0032] S1, obtains the historical maximum starting current of the engine and detects the real-time battery power of the battery.

[0033] In S1, two important parameters need to be obtained, one of which is the historical maximum starting current I of the engine. maxSince low-power protection usually occurs when the car is idle, it is impossible to obtain the real-time maximum starting current, so only the historical maximum starting current can be obtained. Generally speaking, the historical maximum starting current I max It can be stored in the vehicle controller. It can be the maximum starting current of the most recent ignition or the maximum starting current of multiple ignitions. Taking the latter as an example, the program will compare the maximum starting current of each car ignition, compare the two maximum starting currents, and take the larger maximum starting current as the historical maximum starting current I max Obviously, the maximum starting current of the car when it is ignited will fluctuate to a certain extent. The maximum starting current among multiple ignition tasks is taken as the historical maximum starting current I max , which can initially improve the redundancy of the battery. In addition, it is also necessary to obtain the real-time battery power of the battery. The power mentioned in this solution refers to the battery's state of charge. The state of charge is the ratio of the remaining capacity of the battery after it has been used for a period of time or has been shelved for a long time to its capacity in a fully charged state. It is usually expressed in percentages, i.e. 100%, 90%, etc.

[0034] S2, obtaining a pre-stored battery characteristic table, wherein the battery characteristic table at least includes a mapping relationship between the battery power and the maximum instantaneous discharge current of the battery.

[0035] The battery characteristic table is tested, calculated and compiled based on the physical parameters of the battery and written into the register attached to the battery.

[0036] Specifically, the battery characteristic table contains the mapping relationship between battery power, battery voltage, discharge rate and maximum instantaneous discharge current. For example, a lead-acid battery of 8Ah (8V~14V). The continuous discharge rate is 45C, the instantaneous discharge rate is 120C, and the car is discharged instantly when it starts. The maximum instantaneous discharge current of the battery should be calculated. The calculation method of the maximum instantaneous discharge current is: obtain the maximum discharge current allowed by the battery, and calculate the maximum instantaneous discharge current according to the product of the maximum discharge current and the corresponding discharge rate. Therefore, when the battery power is 100%, the maximum instantaneous discharge current allowed is: 8Ahx120C=960A. When the power decreases, the voltage decreases, and the discharge rate also decreases, forming the relationship shown in Table 1.

[0037] Table 1 Battery characteristics

[0038] Battery percentage Voltage Discharge rate (C) Maximum instantaneous discharge current (A) 100％ 14V 120 960 90％ 13.5V 100 800 80％ 13.2V 100 800 70％ 13.0V 90 720 60％ 12.5V 90 720 50％ 12.3V 80 640 40％ 12.0V 60 480 30％ 11V 40 320 20％ 10V 20 160 10％ 9V 10 80 0％ 8V 1 8

[0039] Since each battery has different characteristics, such as a 4Ah (8V-14V) lead-acid battery, it is necessary to form the above voltage, power, and discharge rate relationship table after individual testing, and then write the table into the register. Then, in the following S3, the power that should be reserved is obtained by query. Taking the battery characteristic table shown in Table 1 as an example, in order to reduce the amount of testing, the battery power in the battery characteristic table is an integer multiple of 10.

[0040] In addition, the battery characteristic tables corresponding to batteries of different types and parameters are different. Therefore, in a certain optional solution, the battery characteristic table cannot be modified. After being written into the register attached to the battery by the manufacturer, the user is only allowed to query the data in the battery characteristic table.

[0041] S3, globally screening each maximum instantaneous discharge current higher than the historical maximum starting current from the battery characteristic table, and forming a set of battery capacities corresponding to each of the screened maximum instantaneous discharge currents, and taking the battery capacities with the smallest value from the set as the target capacities.

[0042] In this scheme, since it is unknown before which engine the battery will be installed, the target power needs to be calculated in real time. If the historical maximum starting current Imax of the car obtained in S1 is 300A, according to the relationship shown in Table 1 in S2, when the battery power is between 30-100%, the maximum instantaneous discharge current that the battery can stimulate is between 320-960A. The minimum 30% battery power is taken as the target power among the total 8 power values ​​of 30-100%, that is, the battery reserves 30% of the power to meet the engine starting operation. Obviously, when the real-time battery power of the battery is 30%, the maximum instantaneous discharge current of 320A at this time satisfies the historical maximum starting current of 300A. Assuming that under ideal conditions, the self-discharge rate of the lead-acid battery is usually between 0.1% and 0.3% per month, it can be basically considered that the battery is free of loss for at least 1 month under the premise of disconnecting the peripheral connection. Therefore, the battery power with the smallest value can be taken from the set as the target power, without considering the problem of power decline.

[0043] For example, the historical maximum starting current of a car is I max If it is 500A, you need to reserve 50% of the power. When the power is lower than 50%, you need to enter low power protection and shut down external devices.

[0044] In another optional implementation scheme, S301: after taking the battery power with the smallest value from the set as the target power, the target power is updated in a preset manner. The purpose of this optional scheme is to extend the time when the battery drops below the historical maximum starting current. Taking the above-mentioned 30% battery power as an example, when the battery power of the battery drops to 20%, there is only a maximum instantaneous discharge current of 160A, which is far lower than the required historical maximum starting current of 300A, and the battery power between 20-30% in Table 1 is a state that has not been tested into a table. Under ideal conditions, the self-discharge rate of lead-acid batteries is usually between 0.1% and 0.3% per month, but this value is not very accurate, and it is impossible to know how long the battery can remain above 300A under self-discharge. Therefore, the value of the original target power is slightly increased to form an updated target power, and the updated target power is used as the key parameter in S4, which can further improve the redundancy of the battery.

[0045] Specifically, the preset method includes: adding the preset power value to the target power to form an updated target power, and comparing the updated target power with the real-time battery power. Assuming that 30% is calculated as the target power according to the above S1-S3, a 2% power value can be added to 30%, updated to 32%, as the basis for judgment in S4. How much the updated target power is increased depends mainly on the self-discharge rate of the battery. For example, the product requirement of the battery is to ensure that the engine can be started for at least 2 months after the peripherals are disconnected. Assuming that the battery self-consumption is 1% / month, then after 2 months, the battery power is still higher than 30%. That is to say, the preset power value is set to 2%, so that the updated target power is increased to 32%.

[0046] S4, when the real-time battery power is lower than the target power, the power supply coupling between the battery and the vehicle external equipment is cut off.

[0047] In S4, taking the above-mentioned 30% battery power as an example, when the battery power of the battery drops to 30% (or 32% of the updated target power is adopted), the system cuts off the power supply coupling between the battery and the external equipment of the vehicle. Under ideal conditions, the self-discharge rate of the lead-acid battery is usually between 0.1% and 0.3% per month, and the maximum instantaneous discharge current of the battery can still be maintained above 300A within 1 month.

[0048] On the contrary, if the real-time battery power is higher than the target power, the power supply coupling between the battery and the vehicle external devices is restored.

[0049] Embodiment 2

[0050] On the basis of S1-S4 in the first embodiment, this embodiment further includes S401:

[0051] When the real-time battery power is lower than the target power, it is necessary to detect whether the battery is in a charging state. If so, execute the power cut-off operation in S4. If not, return to S1 and only obtain the real-time battery power of the battery. After skipping S2 and S3, directly perform the operations of S4 and S401 to re-judge whether the real-time battery power is lower than the target power and whether the battery is in a charging state. If the real-time battery power is lower than the target power and the battery is not in a charging state, cut off the power supply coupling between the battery and the external equipment of the vehicle.

[0052] The function of S401 is to prevent the battery from being disconnected from external devices while it is being charged, so that the external devices cannot work properly. Assuming that the current battery power level is lower than 30%, according to the logic of the first embodiment, the power supply to the external device needs to be cut off immediately. Only when the battery power level reaches more than 30% can the power supply to the external device be restored. Therefore, S401 needs to be set to limit the cut-off operation, that is, when the battery is being charged, the power supply coupling between the battery and the vehicle's external devices will not be cut off. In addition, when the system detects that the battery is not in a charging state, it only needs to re-acquire the real-time battery power of the battery, skip S2 and S3, and perform S4 and S401 operations.

[0053] Embodiment 3

[0054] This embodiment provides a low-battery protection device, such as Figure 2 As shown, including:

[0055] The engine starting current acquisition unit 1 is used to obtain the historical maximum starting current of the engine.

[0056] The battery power acquisition unit 2 is used to detect the real-time battery power of the battery;

[0057] A battery characteristic table acquisition unit 3 is used to acquire a pre-stored battery characteristic table, wherein the battery characteristic table at least includes a mapping relationship between the battery power and the maximum instantaneous discharge current of the battery;

[0058] The target power calculation unit 4 globally selects each maximum instantaneous discharge current that is higher than the historical maximum starting current from the battery characteristic table, and forms a set of battery power corresponding to each maximum instantaneous discharge current obtained by the selection, and takes the battery power with the smallest value from the set as the target power;

[0059] The power cut-off unit 5 cuts off the power supply coupling between the battery and the vehicle external device when the real-time battery power is lower than the target power.

[0060] The functions of the engine starting current acquisition unit and the battery power acquisition unit in this embodiment correspond to S1 of the first or second embodiment respectively, and the battery characteristic table acquisition unit, the target power calculation unit and the power cut-off unit correspond to S2-S4 of the first or second embodiment respectively.

[0061] Embodiment 4

[0062] This embodiment provides a computer storable medium, which stores computer instructions. When the computer instructions are called, they are used to execute the low-battery protection method of the first or second embodiment.

[0063] The device embodiments described above are only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative work.

[0064] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or partly contributed to the prior art in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0065] Finally, it should be noted that the low-battery protection method, device and medium disclosed in the embodiments of the present invention only disclose preferred embodiments of the present invention, which are only used to illustrate the technical solution of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments.

Claims

1. A method for protecting a battery from low power, characterized in that: The following steps are involved: Obtain the historical maximum starting current of the engine and detect the real-time battery power of the battery; Acquire a pre-stored battery characteristic table, wherein the battery characteristic table at least includes a mapping relationship between the battery power and the maximum instantaneous discharge current of the battery; Globally screening each of the maximum instantaneous discharge currents higher than the historical maximum starting current from the battery characteristic table, and forming a set of the battery power corresponding to each of the screened maximum instantaneous discharge currents, and taking the battery power with the smallest value from the set as the target power; When the real-time battery power level is lower than the target power level, the power supply coupling between the battery and the vehicle external device is cut off.

2. The low-battery protection method according to claim 1, characterized in that: After taking the battery power with the smallest value from the set as the target power, the target power is updated according to a preset method.

3. The low-battery protection method according to claim 2, characterized in that: The preset method includes: adding a preset power value to the target power to form an updated target power, and comparing the updated target power with the real-time battery power based on the updated target power.

4. The low-battery protection method according to claim 1, characterized in that: The battery characteristic table includes a mapping relationship between battery power, battery voltage, discharge rate and maximum instantaneous discharge current.

5. The low-battery protection method according to claim 4, characterized in that: The battery capacities in the battery characteristic table are all integer multiples of 10.

6. The low-battery protection method according to claim 4, characterized in that: The maximum instantaneous discharge current is calculated by obtaining the maximum discharge current allowed by the battery, and calculating the maximum instantaneous discharge current according to the product of the maximum discharge current and the corresponding discharge rate.

7. The low-battery protection method according to claim 1, characterized in that: The battery characteristic table is tested, calculated and edited according to the physical parameters of the storage battery, and is written into a register attached to the storage battery.

8. The low-battery protection method according to claim 1, characterized in that: The battery characteristics table cannot be modified.

9. A battery low power protection device, characterized in that: include: The engine starting current acquisition unit is used to obtain the historical maximum starting current of the engine. A battery power acquisition unit, used to detect the real-time battery power of the battery; A battery characteristic table acquisition unit, used to acquire a pre-stored battery characteristic table, wherein the battery characteristic table at least includes a mapping relationship between the battery power and the maximum instantaneous discharge current of the battery; a target power calculation unit, which globally selects each of the maximum instantaneous discharge currents higher than the historical maximum starting current from the battery characteristic table, and forms a set of the battery power corresponding to each of the maximum instantaneous discharge currents obtained by the selection, and takes the battery power with the smallest value from the set as the target power; A power cut-off unit is configured to cut off the power supply coupling between the storage battery and the vehicle external device when the real-time battery power level is lower than the target power level.

10. A computer storable medium, characterized in that: The computer storable medium stores computer instructions, and when the computer instructions are called, they are used to execute the battery low-power protection method as described in any one of claims 1-8.

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