A nominal voltage identification method, device, terminal device and storage medium

Abstract

This application is applicable to the field of voltage identification technology, and provides a nominal voltage identification method, device, terminal device, and storage medium. In the embodiments of this application, the initial voltage of the battery is obtained, and the initial nominal voltage of the battery is determined according to the initial voltage; the battery is charged with a constant current. When the constant current charging lasts for a first preset time period, the first voltage drop value is determined; when the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, the battery is charged with a constant voltage, and the voltage drop time when the charging current decreases by a preset current value is determined; when the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, the battery is charged with a constant current. When the constant current charging reaches the preset gas evolution voltage, the second voltage drop value is determined; the nominal voltage of the battery is determined according to the second voltage drop value, so as to accurately identify the nominal voltage of the battery, determine the charging logic of the battery according to the nominal voltage of the battery, and further avoid the dangerous situations caused by improper battery charging.

Description

Technical Field

[0001] This application belongs to the technical field of voltage recognition, and particularly relates to a nominal voltage recognition method, device, terminal device, and storage medium. Background Art

[0002] With the development of society, electric vehicles such as electric bicycles, electric tricycles, and elderly scooters are becoming more and more common in people's lives. The lead-acid battery chargers used in existing electric vehicles need to adopt a specific charging logic for battery charging, and this charging logic is determined by parameters such as battery type, rated nominal voltage, and capacity.

[0003] When a user misuses a charger with a mismatched charging logic or a public DC charging device to inappropriately charge a lead-acid battery, due to the mismatch between the voltage and current output by the charging device and the battery parameters, dangerous situations such as overcharging of the battery, too high voltage, internal short circuit, and thermal runaway will occur, which in turn leads to frequent fire accidents. Summary of the Invention

[0004] Embodiments of this application provide a nominal voltage recognition method, device, terminal device, and storage medium, which can solve the dangerous situations caused by inappropriate battery charging.

[0005] In a first aspect, embodiments of this application provide a nominal voltage recognition method, including:

[0006] Obtain the initial voltage of the battery, and determine the initial nominal voltage of the battery according to the initial voltage;

[0007] Perform constant current charging on the battery, and when the constant current charging lasts for a first preset time period, determine the first voltage drop value of the battery;

[0008] When the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, perform constant voltage charging on the battery, and determine the voltage drop time when the charging current of the battery decreases by a preset current value;

[0009] When the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, perform constant current charging on the battery, and when the constant current charging reaches the preset gassing voltage, determine the second voltage drop value of the battery;

[0010] Determine the nominal voltage of the battery according to the second voltage drop value.

[0011] In one embodiment, the performing constant current charging on the battery, and when the constant current charging lasts for a first preset time period, determining the first voltage drop value of the battery includes:

[0012] Perform constant current charging on the battery with a first preset current;

[0013] When the battery is charged at a constant current for a first preset time period, determine a first voltage and a second voltage of the battery; the first voltage is the voltage before charging stops, and the second voltage is the voltage after a second preset time period since charging stops.

[0014] Calculate a first voltage difference between the first voltage and the second voltage, and determine the first voltage drop value as the first voltage difference.

[0015] In one embodiment, after charging the battery at a constant current with a first preset current, it includes:

[0016] If the current for charging the battery at a constant current cannot reach the first preset current, then determine the nominal voltage of the battery as the initial nominal voltage.

[0017] In one embodiment, for the constant voltage charging of the battery, determining the voltage drop time when the charging current of the battery decreases by a preset current value includes:

[0018] Charge the battery at a constant voltage with the current voltage to reduce the charging current for the battery.

[0019] When the charging current decreases by the preset current value, determine the voltage drop time when the charging current decreases by the preset current value.

[0020] In one embodiment, before charging the battery at a constant voltage according to the current voltage, it includes:

[0021] Charge the battery at a constant current with the charging current for a third preset time period to determine the current voltage of the battery.

[0022] In one embodiment, for the constant current charging of the battery, when charging at a constant current to a preset gas evolution voltage, determining a second voltage drop value of the battery includes:

[0023] Charge the battery at a constant current with a second preset current.

[0024] When charging at a constant current to the gas evolution voltage, determine a third voltage and a fourth voltage of the battery; the third voltage is the voltage before charging stops, and the fourth voltage is the voltage after a second preset time period since charging stops.

[0025] Calculate a second voltage difference between the third voltage and the fourth voltage, and determine the second voltage difference as the second voltage drop value.

[0026] In one embodiment, determining the nominal voltage of the battery according to the second voltage drop value includes:

[0027] Determine the voltage drop threshold of the battery according to the above initial nominal voltage;

[0028] When the second voltage drop value is less than or equal to the voltage drop threshold, determine the nominal voltage one level higher than the above initial nominal voltage as the nominal voltage of the battery.

[0029] In a second aspect, an embodiment of the present application provides a nominal voltage identification device, including:

[0030] An acquisition module, configured to acquire the initial voltage of the battery and determine the initial nominal voltage of the battery according to the initial voltage;

[0031] A first amplitude determination module, configured to perform constant current charging on the battery to determine the first voltage drop value of the battery;

[0032] A time determination module, configured to perform constant voltage charging on the battery when the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, and determine the voltage drop time when the charging current of the battery decreases by a preset current value;

[0033] A second amplitude determination module, configured to perform constant current charging on the battery when the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, and determine the second voltage drop value of the battery according to a preset gas evolution voltage;

[0034] A nominal voltage determination module, configured to determine the nominal voltage of the battery according to the second voltage drop value.

[0035] In a third aspect, an embodiment of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of any of the above nominal voltage identification methods are implemented.

[0036] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of any of the above nominal voltage identification methods are implemented.

[0037] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product runs on a terminal device, the terminal device is enabled to execute any of the nominal voltage identification methods in the first aspect.

[0038] In the embodiments of the present application, the initial voltage of the battery is obtained, and the initial nominal voltage of the battery is determined according to the initial voltage. The battery is charged with a constant current. When the constant current charging lasts for a first preset time period, the first voltage drop value of the battery is determined. When the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, it indicates that the current voltage drop value of the battery does not conform to the voltage drop value corresponding to the above initial nominal voltage. Then the battery is charged with a constant voltage, and the voltage drop time when the charging current of the battery decreases by a preset current value is determined, so that the current voltage drop speed of the battery can be obtained. When the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, it indicates that the current voltage drop speed of the battery does not conform to the voltage drop speed corresponding to the above initial nominal voltage. Therefore, the battery is charged with a constant current. When the constant current charging reaches the preset gas evolution voltage, the second voltage drop value of the battery is determined; the nominal voltage of the battery is determined according to the second voltage drop value. By judging the voltage drop value and voltage drop speed of the battery, the nominal voltage of the battery can be accurately identified, and the charging logic of the battery can be determined according to the nominal voltage of the battery, thereby avoiding the dangerous situations caused by improper battery charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1 is the first flow chart of the nominal voltage identification method provided by the embodiments of the present application;

[0041] Figure 2 is the second flow chart of the nominal voltage identification method provided by the embodiments of the present application;

[0042] Figure 3 is the third flow chart of the nominal voltage identification method provided by the embodiments of the present application;

[0043] Figure 4 is the fourth flow chart of the nominal voltage identification method provided by the embodiments of the present application;

[0044] Figure 5 is the structural diagram of the nominal voltage identification device provided by the embodiments of the present application;

[0045] Figure 6 is the structural diagram of the terminal device provided by the embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0047] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0048] It should also be understood that the term "and / or" used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0049] As used in the specification of the present application and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrases "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" depending on the context.

[0050] In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0051] Figure 1 The flowchart of a nominal voltage identification method in an embodiment of the present application is shown. The execution subject of this method can be a terminal device, which can be a device with a charging function or a device connected to a charging device for controlling the charging logic of the charging device. This embodiment is described by taking a terminal device with a charging function as an example, as Figure 1 shown, the above nominal voltage identification method may include the following steps:

[0052] Step S101: Obtain the initial voltage of the battery and determine the initial nominal voltage of the battery according to the initial voltage.

[0053] In this embodiment, since the ranges of battery voltages corresponding to different levels of nominal voltages are different, and there is an overlapping part in the ranges of battery voltages corresponding to different nominal voltages. Therefore, in order to accurately determine the nominal voltage of the battery to be charged currently, the terminal device can obtain the initial voltage of the battery to be charged currently before charging, so as to pre-determine the nominal voltage of the battery based on the obtained initial voltage, that is, the above-mentioned initial nominal voltage. And then compare the initial nominal voltage with each determination condition of the battery to determine whether the initial nominal voltage is the correct nominal voltage of the battery, so as to accurately obtain the nominal voltage of the battery. Among them, the levels of the above-mentioned nominal voltages are determined by sorting according to the voltage magnitudes of the nominal voltages; the above-mentioned initial voltage is the voltage detected before the battery is charged; the above-mentioned battery is generally a lead-acid battery.

[0054] It can be understood that the nominal voltages of general conventional lead-acid batteries are 72V, 60V, 48V, and 36V from large to small. Among them, the highest-level nominal voltage of the lead-acid battery is 72V, and the lowest-level nominal voltage is 36V. The terminal device can determine the number of battery cells of the lead-acid battery through the obtained nominal voltage of the lead-acid battery. The number of battery cells of the lead-acid battery is 1 / 2 of the nominal voltage. For example, when the nominal voltage of the lead-acid battery is 60V, the corresponding number of battery cells is 30. Further, the terminal device can determine the range of the battery voltage through the obtained number of battery cells of the lead-acid battery. The upper limit of the range is the product of the number of battery cells and 2.45, and the lower limit of the range is the product of the number of battery cells and 1.67. For example, when the number of battery cells of the lead-acid battery is 30, the corresponding range is 50.1V to 73.5V.

[0055] Specifically but not limitedly, when the terminal device detects that the initial voltage of the battery it obtains is 59V, since 59V is within the range of 50.1V to 73.5V, and the nominal voltage corresponding to this range is 60V, the current initial nominal voltage of the battery is 60V. When the terminal device detects that the initial voltage of the battery it obtains is in the overlapping area of the charging ranges corresponding to 60V and 48V, the lower nominal voltage of the two is determined as the initial nominal voltage. Since the nominal voltage of the battery is judged by the continuous rise of the battery voltage subsequently, judging with the lower nominal voltage of the two can ensure the accuracy of the battery nominal voltage judgment.

[0056] Step S102: Charge the battery at a constant current. When the constant current charging lasts for the first preset time period, determine the first voltage drop value of the battery.

[0057] In this embodiment, the terminal device can determine whether the battery meets the voltage drop value corresponding to the initially nominal voltage obtained through pre-judgment based on the voltage drop value of the battery. If the voltage drop value of the battery meets the voltage drop value corresponding to the initially nominal voltage, it indicates that the current initially nominal voltage is the correct nominal voltage of the battery. And this voltage drop value can be determined after constant current charging of the battery for a first preset time period.

[0058] In one embodiment, the terminal device can determine the voltage drop threshold corresponding to the initially nominal voltage through the number of battery cells corresponding to the initially nominal voltage. When the above first voltage drop value is greater than the above voltage drop threshold, it indicates that the current voltage drop value of the battery meets the voltage drop value corresponding to the initially nominal voltage, that is, the current initially nominal voltage is the correct nominal voltage of the battery. Among them, the above voltage drop threshold is the product of the number of battery cells and a preset threshold calculation coefficient, and the preset threshold calculation coefficient can be set to 0.2.

[0059] In one embodiment, as Figure 2 shown, step S102 may include:

[0060] Step S201: Perform constant current charging on the battery with a first preset current.

[0061] Step S202: When the constant current charging lasts for a first preset time period, determine the first voltage and the second voltage of the battery; the above first voltage is the voltage before stopping charging, and the above second voltage is the voltage after stopping charging for a second preset time period.

[0062] Step S203: Calculate the first voltage difference between the first voltage and the second voltage, and determine the first voltage difference as the first voltage drop value.

[0063] In this embodiment, in order to make the battery voltage tend to be stable after stopping charging, the terminal device can obtain the voltage of the battery after stopping charging for a second preset time period, so as to obtain a more accurate voltage drop value of the battery. Among them, the above first preset current can be set to 3A, 2A, 1A, etc., the above first preset time period can be set to 3 minutes, and the above second preset time period can be set to 1 minute.

[0064] Optionally, in order to make the judgment result more accurate, the battery can be subjected to constant current charging for a first preset time period with different currents multiple times, and after the first preset time period of charging, the voltage differences corresponding to the battery are respectively determined, so as to obtain the first voltage drop values of the battery corresponding to different currents.

[0065] Specifically, the terminal device performs constant-current charging with a constant current of 3A. After constant-current charging for 3 minutes with a current of 3A, the first voltage is determined and charging is stopped. After stopping charging for 1 minute, the second voltage is determined, the first voltage difference is calculated, and the first voltage drop value corresponding to constant-current charging with a current of 3A is determined. Then, the terminal device performs constant-current charging with a constant current of 2A. After constant-current charging for 3 minutes with a current of 2A, the first voltage is determined and charging is stopped. After stopping charging for 1 minute, the second voltage is determined, the first voltage difference is calculated, and the first voltage drop value corresponding to constant-current charging with a current of 2A is determined. Finally, the terminal device performs constant-current charging with a constant current of 1A. After constant-current charging for 3 minutes with a current of 1A, the first voltage is determined and charging is stopped. After stopping charging for 1 minute, the second voltage is determined, the first voltage difference is calculated, and the first voltage drop value corresponding to constant-current charging with a current of 1A is determined.

[0066] Correspondingly, when the first voltage drop value corresponding to constant-current charging with a current of 3A, the first voltage drop value corresponding to constant-current charging with a current of 2A, and the first voltage drop value corresponding to constant-current charging with a current of 1A are all greater than the voltage drop threshold obtained above, it indicates that the voltage drop value of the current battery conforms to the voltage drop value corresponding to the initial nominal voltage, that is, the current initial nominal voltage is the correct nominal voltage of the battery.

[0067] Furthermore, in order to make the judgment result more accurate, after obtaining the first voltage drop values of the battery corresponding to different currents, the average value can be calculated, and the obtained average value is used as the voltage drop value of the battery.

[0068] In one embodiment, when charging the battery with a relatively high current, the current voltage of the battery needs to be higher than the trickle charging threshold. However, if the range of the battery voltage corresponding to the current nominal voltage is relatively high, such as 72V, the battery voltage cannot rise above the trickle charging threshold. At this time, it indicates that the initial nominal voltage of the pre-judgment degree is the correct nominal voltage of the battery, and subsequent judgments are not required. Therefore, after step S201, it may include: if the current for constant-current charging of the battery cannot reach the first preset current, it indicates that the voltage of the current battery cannot continue to rise, and the nominal voltage of the battery can be determined as the initial nominal voltage.

[0069] Step S103: When the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, perform constant-voltage charging on the battery, and determine the voltage drop time when the charging current of the battery decreases by a preset current value.

[0070] In this embodiment, when the obtained first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, it indicates that the voltage drop value of the battery does not conform to the voltage drop value corresponding to the initial nominal voltage. This means that the current initial nominal voltage cannot be determined as the correct nominal voltage of the battery, which may be caused by the aging of the battery. Therefore, the terminal device determines whether the current initial nominal voltage is the correct nominal voltage of the battery by detecting the voltage drop speed of the battery. The judgment of the voltage drop speed can be made by the voltage drop time it takes for the charging current for charging the battery to drop below a preset current value when the battery is charged at a constant voltage.

[0071] In one embodiment, when the terminal device determines that the above voltage drop time is greater than the voltage drop time corresponding to the initial nominal voltage, it indicates that the voltage drop speed of the current battery conforms to the voltage drop speed corresponding to the initial nominal voltage, that is, the current initial nominal voltage is the correct nominal voltage of the battery. Among them, the above voltage drop time can be set to 3 minutes.

[0072] In one embodiment, as Figure 3 shown, determining the voltage drop time when the charging current of the battery drops by a preset current value during the constant voltage charging of the battery in step S103 includes:

[0073] Step S301: Constant current charge the battery at a charging current for a third preset time period to determine the current voltage of the battery.

[0074] Step S302: Constant voltage charge the battery at the current voltage to reduce the charging current for charging the battery currently.

[0075] Step S303: When the charging current drops by a preset current value, determine the voltage drop time when the charging current drops by the preset current value.

[0076] In this embodiment, generally during constant voltage charging, the charging current for charging the battery will decrease. To stabilize the battery voltage, the battery can be first constant current charged at a certain charging current for a preset time period, and then constant voltage charged according to the current voltage, so as to improve the accuracy of determining the voltage drop time when the charging current drops by a preset current value. The voltage drop time it takes for the preset current value to drop represents the voltage drop speed of the current battery. Among them, the above charging current can be set to 2A, 2.5A, 3A, etc., the above third preset time period can be set to 1 minute, and the above preset current value can be set to 0.5A.

[0077] Optionally, in order to make the judgment result more accurate, the battery can be constant current charged at different currents for the third preset time period multiple times, and then constant voltage charged, and the voltage drop time when the charging current drops by a preset current value is determined respectively, so as to obtain the voltage drop times corresponding to different currents respectively.

[0078] Specifically, the terminal device performs constant-current charging at a constant current of 2A. After 1 minute of constant-current charging at 2A, the current voltage is determined, and the battery is charged at a constant voltage with the current voltage, which causes the charging current for charging the battery to decrease. When the charging current decreases to 1.5A, from 1.5A to 1A, and from 1A to 0.5A, the corresponding voltage-drop times are respectively recorded. Then, the terminal device performs constant-current charging at a constant current of 2.5A. After 1 minute of constant-current charging at 2.5A, the current voltage is determined, and the battery is charged at a constant voltage with the current voltage, which causes the charging current for charging the battery to decrease. When the charging current decreases to 2A, from 2A to 1.5A, and from 1.5A to 1A, the corresponding voltage-drop times are respectively recorded. Finally, the terminal device performs constant-current charging at a constant current of 3A. After 1 minute of constant-current charging at 3A, the current voltage is determined, and the battery is charged at a constant voltage with the current voltage, which causes the charging current for charging the battery to decrease. When the charging current decreases to 2.5A, from 2.5A to 2A, and from 2A to 1.5A, the corresponding voltage-drop times are respectively recorded.

[0079] Correspondingly, when the voltage-drop times respectively corresponding to the above different currents are all greater than the obtained voltage-drop time, it indicates that the voltage-drop speed of the current battery conforms to the voltage-drop speed corresponding to the initial nominal voltage, that is, the current initial nominal voltage is the correct nominal voltage of the battery.

[0080] Furthermore, in order to make the judgment result more accurate, after obtaining the voltage-drop times of the battery respectively corresponding to different currents, the average value can be calculated, and the obtained average value is used as the voltage-drop time of the battery.

[0081] It can be understood that the steps of judging by constant-current charging and judging by constant-voltage charging can be interchanged, that is, first judge by constant-voltage charging and then judge by constant-current charging.

[0082] Step S104: When the voltage-drop time is less than or equal to the voltage-drop time corresponding to the initial nominal voltage, perform constant-current charging on the battery. When the constant-current charging reaches the preset gas evolution voltage, determine the second voltage-drop value of the battery.

[0083] In this embodiment, when the obtained voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, it indicates that the voltage drop speed of the battery does not conform to the voltage drop speed corresponding to the initial nominal voltage. Then it shows that the current initial nominal voltage cannot be determined as the correct nominal voltage of the battery, which may be caused by over-discharging of the battery. Therefore, the terminal device can judge whether the voltage drop value after the battery is charged to the gassing voltage conforms to the voltage drop value corresponding to the initially judged initial nominal voltage. If the voltage drop value of the battery conforms to the voltage drop value corresponding to the initial nominal voltage, it indicates that the current initial nominal voltage is the correct nominal voltage of the battery. And the voltage drop value can be determined after the battery is charged at a constant current to the gassing voltage. Among them, the above-mentioned gassing voltage can be set as the upper limit of the battery voltage corresponding to the initial nominal voltage.

[0084] It can be understood that since the gassing voltages of lead-acid batteries corresponding to different nominal voltages are different, and if the lead-acid battery cannot be charged according to the correct gassing voltage, the lead-acid battery may not be fully charged or overcharged and bulged. Therefore, in this embodiment, when starting to charge the lead-acid battery, the nominal voltage of the lead-acid battery will be pre-judged first, and then after charging to the corresponding gassing voltage, the correctness of the voltage level judgment will be confirmed again to ensure that the lead-acid battery is charged correctly. And because the gassing voltage of the battery is relatively large, first, a constant current charge or a constant voltage charge for a preset time period is used to judge the nominal voltage of the battery, thereby increasing the voltage of the battery during the above judgment process. If the above judgment cannot obtain whether the initial nominal voltage is the correct nominal voltage of the battery, then the gassing voltage is carried out, so that the current step can reach the gassing voltage of the battery more quickly and prevent damage to the battery when the battery is immediately charged to the gassing voltage.

[0085] In one embodiment, as Figure 4 shown, in step S104, when the battery is charged at a constant current, when the constant current charging reaches the preset gassing voltage, determining the second voltage drop value of the battery includes:

[0086] Step S401: Charge the battery at a constant current with a second preset current.

[0087] Step S402: When the constant current charging reaches the gassing voltage of the battery, determine the third voltage and the fourth voltage of the battery; the above-mentioned third voltage is the voltage before stopping charging, and the above-mentioned fourth voltage is the voltage after a second preset time period after stopping charging.

[0088] Step S403: Calculate the second voltage difference between the third voltage and the fourth voltage, and determine the second voltage difference as the second voltage drop value.

[0089] In this embodiment, in order to make the battery voltage tend to be stable after charging stops, the terminal device can obtain the battery voltage after the second preset time period of stopping charging the battery, so as to obtain a more accurate voltage drop value of the battery. Among them, the above-mentioned second preset current can be set to 3A, 2A, etc.

[0090] Optionally, in order to make the judgment result more accurate, the battery can be charged at a constant current to the gassing voltage multiple times with different currents, and after charging to the gassing voltage, the corresponding voltage difference of the battery can be determined respectively, so as to obtain the first voltage drop value of the battery corresponding to different currents.

[0091] Step S105: Determine the nominal voltage of the battery according to the second voltage drop value.

[0092] In one embodiment, step S105 includes: determining the voltage drop threshold of the battery according to the initial nominal voltage; when the second voltage drop value is less than or equal to the voltage drop threshold, determining the nominal voltage one level higher than the initial nominal voltage as the nominal voltage of the battery.

[0093] In one embodiment, the terminal device can determine the voltage drop threshold corresponding to the initial nominal voltage through the number of battery cells corresponding to the initial nominal voltage. If the above-mentioned second voltage drop value is greater than the above-mentioned voltage drop threshold, it means that the voltage drop value of the current battery conforms to the voltage drop value corresponding to the initial nominal voltage, that is, the current initial nominal voltage is the correct nominal voltage of the battery. And if the above-mentioned second voltage drop value is less than or equal to the above-mentioned voltage drop threshold, it means that the nominal voltage of the current battery is the nominal voltage one level higher than the initial nominal voltage. On the basis of enabling the terminal device to accurately identify the nominal voltage of the battery, the charging voltage and current matching the nominal voltage of the battery are output, so as to intelligently adapt to the charging logics corresponding to lead-acid batteries with different nominal voltages such as 36V, 48V, 60V, 72V, etc., and adjust the charging voltage and current in real time.

[0094] Specifically, the terminal device performs constant current charging with a constant current of 3A. When charging at a constant current of 3A to the gassing voltage, the third voltage is determined and charging stops. After stopping charging for 1 minute, the fourth voltage is determined, the second voltage difference is calculated, the second voltage drop value corresponding to constant current charging at 3A is determined, and a judgment is made. If the second voltage drop value does not conform to the voltage drop value corresponding to the initial nominal voltage, the terminal device performs constant current charging with a constant current of 2A. When charging at a constant current of 2A to the gassing voltage, the third voltage is determined and charging stops. After stopping charging for 1 minute, the fourth voltage is determined, the second voltage difference is calculated, the second voltage drop value corresponding to constant current charging at 2A is determined, and a judgment is made. If the second voltage drop value does not conform to the voltage drop value corresponding to the initial nominal voltage, the nominal voltage one level higher than the initial nominal voltage is determined as the nominal voltage of the battery. For example, if the initial nominal voltage is 60V, the nominal voltage of 72V is determined as the nominal voltage of the battery.

[0095] In the embodiment of the present application, the initial voltage of the battery is obtained, and the initial nominal voltage of the battery is determined according to the initial voltage. The battery is charged with a constant current. When the constant current charging lasts for a first preset time period, the first voltage drop value of the battery is determined. When the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, it indicates that the current voltage drop value of the battery does not conform to the voltage drop value corresponding to the above initial nominal voltage. Then, the battery is charged with a constant voltage, and the voltage drop time when the charging current of the battery decreases by a preset current value is determined, so that the current voltage drop speed of the battery can be obtained. When the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, it indicates that the current voltage drop speed of the battery does not conform to the voltage drop speed corresponding to the above initial nominal voltage. Therefore, the battery is charged with a constant current. When the constant current charging reaches the preset gas evolution voltage, the second voltage drop value of the battery is determined; the nominal voltage of the battery is determined according to the second voltage drop value. By judging the voltage drop value and the voltage drop speed of the battery, the nominal voltage of the battery can be accurately identified, and the charging logic of the battery can be determined according to the nominal voltage of the battery, thereby avoiding the dangerous situation caused by improper battery charging.

[0096] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0097] Corresponding to the above-mentioned method for identifying a nominal voltage, Figure 5 The following shows a schematic structural diagram of a nominal voltage identification device in an embodiment of the present application. As Figure 5 shown, the above-mentioned nominal voltage identification device may include:

[0098] An acquisition module 501, configured to acquire the initial voltage of the battery and determine the initial nominal voltage of the battery according to the initial voltage.

[0099] A first amplitude determination module 502, configured to charge the battery with a constant current, and determine the first voltage drop value of the battery when the constant current charging lasts for a first preset time period.

[0100] A time determination module 503, configured to charge the battery with a constant voltage when the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, and determine the voltage drop time when the charging current of the battery decreases by a preset current value.

[0101] A second amplitude determination module 504, configured to charge the battery with a constant current when the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, and determine the second voltage drop value of the battery when the constant current charging reaches the preset gas evolution voltage.

[0102] A nominal voltage determination module 505, configured to determine the nominal voltage of the battery according to the second voltage drop value.

[0103] In one embodiment, the above-mentioned first amplitude determination module 502 may include:

[0104] A first constant current charging unit for charging the battery with a first preset current in a constant current manner.

[0105] A first voltage determination unit for determining a first voltage and a second voltage of the battery when charging in a constant current for a first preset time period; the first voltage is the voltage before stopping charging, and the second voltage is the voltage after stopping charging for a second preset time period.

[0106] A first calculation unit for calculating a first voltage difference between the first voltage and the second voltage, and determining the first voltage difference as the first voltage drop amplitude.

[0107] In one embodiment, the above-mentioned voltage determination unit may include:

[0108] A nominal voltage determination subunit for determining the nominal voltage of the battery as the initial nominal voltage if the current for charging the battery in a constant current cannot reach the first preset current.

[0109] In one embodiment, the above-mentioned time determination module 503 may include:

[0110] A constant voltage charging unit for charging the battery with the current voltage in a constant voltage manner to reduce the charging current for the current charging of the battery.

[0111] A time determination unit for determining the voltage drop time when the charging current drops by a preset current value.

[0112] In one embodiment, the above-mentioned time determination module 503 may further include:

[0113] A second voltage determination unit for charging the battery with a constant current for a third preset time period with the charging current, and determining the current voltage of the battery.

[0114] In one embodiment, the above-mentioned second amplitude determination module 504 may include:

[0115] A second constant current charging unit for charging the battery with a second preset current in a constant current manner.

[0116] A third voltage determination unit for determining a third voltage and a fourth voltage of the battery when charging in a constant current to the gas evolution voltage; the third voltage is the voltage before stopping charging, and the fourth voltage is the voltage after stopping charging for a second preset time period.

[0117] A second calculation unit, configured to calculate a second voltage difference between a third voltage and a fourth voltage, and determine the second voltage difference as a second voltage drop value.

[0118] In one embodiment, the above-mentioned nominal voltage determination module 505 may include:

[0119] A threshold determination unit, configured to determine a voltage drop threshold of the battery according to an initial nominal voltage.

[0120] A nominal voltage determination unit, configured to determine a nominal voltage of the battery that is one level higher than the initial nominal voltage when the second voltage drop value is less than or equal to the voltage drop threshold.

[0121] In the embodiment of the present application, the initial voltage of the battery is obtained, and the initial nominal voltage of the battery is determined according to the initial voltage. The battery is charged with a constant current. When the constant current charging lasts for a first preset time period, the first voltage drop value of the battery is determined. When the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, it indicates that the current voltage drop value of the battery does not meet the voltage drop value corresponding to the above initial nominal voltage. Then the battery is charged with a constant voltage, and the voltage drop time when the charging current of the battery decreases by a preset current value is determined, so that the current voltage drop speed of the battery can be obtained. When the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, it indicates that the current voltage drop speed of the battery does not meet the voltage drop speed corresponding to the above initial nominal voltage. Therefore, the battery is charged with a constant current. When the constant current charging reaches the preset gas evolution voltage, the second voltage drop value of the battery is determined; the nominal voltage of the battery is determined according to the second voltage drop value. By judging the voltage drop value and voltage drop speed of the battery, the nominal voltage of the battery can be accurately identified, and the charging logic of the battery can be determined according to the nominal voltage of the battery, thereby avoiding the dangerous situation caused by improper battery charging.

[0122] Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described devices and modules can refer to the corresponding processes in the foregoing system embodiments and method embodiments, and will not be described herein again.

[0123] Figure 6 It is a schematic structural diagram of a terminal device provided by an embodiment of the present application. For the convenience of description, only parts related to the embodiment of the present application are shown.

[0124] As Figure 6 shown, the terminal device 6 of this embodiment includes: at least one processor 600 ( Figure 6Only one is shown in the figure), a memory 601 connected to the above-mentioned processor 600, and a computer program 602 stored in the above-mentioned memory 601 and executable on the above-mentioned at least one processor 600, such as a nominal voltage identification program. When the above-mentioned processor 600 executes the above-mentioned computer program 602, the steps in the above-mentioned various embodiments of the nominal voltage identification method are implemented, such as Figure 1 The steps S101 to S105 shown. Alternatively, when the above-mentioned processor 600 executes the above-mentioned computer program 602, the functions of each module in the above-mentioned device embodiments are implemented, such as Figure 5 The functions of the modules 501 to 505 shown.

[0125] Exemplarily, the above-mentioned computer program 602 can be divided into one or more modules, and the above-mentioned one or more modules are stored in the above-mentioned memory 601 and executed by the above-mentioned processor 600 to complete the present application. The above-mentioned one or more modules can be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the above-mentioned computer program 602 in the above-mentioned terminal device 6. For example, the above-mentioned computer program 602 can be divided into an acquisition module 501, a first amplitude determination module 502, a time determination module 503, a second amplitude determination module 504, and a nominal voltage determination module 505. The specific functions of each module are as follows:

[0126] The acquisition module 501 is used to acquire the initial voltage of the battery and determine the initial nominal voltage of the battery according to the initial voltage;

[0127] The first amplitude determination module 502 is used to perform constant current charging on the battery, and when the constant current charging lasts for a first preset time period, determine the first voltage drop amplitude of the battery;

[0128] The time determination module 503 is used to perform constant voltage charging on the battery when the first voltage drop amplitude is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, and determine the voltage drop time when the charging current of the battery decreases by a preset current value;

[0129] The second amplitude determination module 504 is used to perform constant current charging on the battery when the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, and when the constant current charging reaches the preset gas evolution voltage, determine the second voltage drop amplitude of the battery;

[0130] The nominal voltage determination module 505 is used to determine the nominal voltage of the battery according to the second voltage drop amplitude.

[0131] The above-mentioned terminal device 6 may include, but is not limited to, a processor 600 and a memory 601. Those skilled in the art can understand, Figure 6The above is only an example of the terminal device 6, which does not constitute a limitation on the terminal device 6. It may include more or fewer components than those shown in the figure, or combine some components, or different components. For example, it may also include input and output devices, network access devices, buses, etc.

[0132] The so-called processor 600 may be a central processing unit (CPU), and the processor 600 may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0133] In some embodiments, the above-mentioned memory 601 may be an internal storage unit of the above-mentioned terminal device 6, such as the hard disk or memory of the terminal device 6. In other embodiments, the above-mentioned memory 601 may also be an external storage device of the above-mentioned terminal device 6, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the above-mentioned terminal device 6. Further, the above-mentioned memory 601 may also include both the internal storage unit and the external storage device of the above-mentioned terminal device 6. The above-mentioned memory 601 is used to store an operating system, application programs, a boot loader, data, and other programs, such as the program code of the above-mentioned computer program, etc. The above-mentioned memory 601 may also be used to temporarily store data that has been output or will be output.

[0134] Those skilled in the art can clearly understand that, for the convenience and conciseness of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be assigned to different functional units and modules according to needs, that is, the internal structure of the above-mentioned device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0135] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0136] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in the form of hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0137] In the embodiments provided in this application, it should be understood that the disclosed device / terminal device and method can be implemented in other ways. For example, the device / terminal device embodiments described above are only illustrative. For example, the above-mentioned division of modules or units is only a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces. The indirect coupling or communication connection of devices or units can be in an electrical, mechanical or other form.

[0138] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0139] In addition, each functional unit in various embodiments of the present application may be integrated into a processing unit, may exist physically alone for each unit, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0140] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned method embodiments of the present application, a computer program may be used to instruct relevant hardware to complete. The above-mentioned computer program may be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned method embodiments may be implemented. Among them, the above-mentioned computer program includes computer program code, and the above-mentioned computer program code may be in the form of source code, object code, executable file or some intermediate form, etc. The above-mentioned computer-readable medium may at least include: any entity or device that can carry the computer program code to the photographing device / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disc, etc. In some jurisdictions, according to legislation and patent practice, the computer-readable medium may not be an electrical carrier signal and a telecommunication signal.

[0141] The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, rather than limiting it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A nominal voltage identification method, characterized in that, Including: Obtain the initial voltage of the battery, and determine the initial nominal voltage of the battery according to the initial voltage; Perform constant current charging on the battery with a first preset current; When constant current charging for a first preset time period, determine the first voltage and the second voltage of the battery; the first voltage is the voltage before stopping charging, and the second voltage is the voltage after stopping charging for a second preset time period; Calculate the first voltage difference between the first voltage and the second voltage, and determine the first voltage difference as the first voltage drop value; When the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, perform constant voltage charging on the battery with the current voltage to reduce the charging current currently charging the battery; When the charging current decreases by a preset current value, determine the voltage drop time when the charging current decreases by the preset current value; When the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, perform constant current charging on the battery with a second preset current; when constant current charging reaches a preset gassing voltage, determine the third voltage and the fourth voltage of the battery; the third voltage is the voltage before stopping charging, and the fourth voltage is the voltage after stopping charging for a second preset time period; Calculate the second voltage difference between the third voltage and the fourth voltage, and determine the second voltage difference as the second voltage drop value; Determine the nominal voltage of the battery according to the second voltage drop value.

2. The nominal voltage identification method according to claim 1, characterized in that After performing constant current charging on the battery with a first preset current, including: If the current for performing constant current charging on the battery cannot reach the first preset current, then determine the nominal voltage of the battery as the initial nominal voltage.

3. The nominal voltage identification method according to claim 1, characterized in that, Before performing constant voltage charging on the battery with the current voltage, including: Perform constant current charging on the battery with the charging current for a third preset time period, and determine the current voltage of the battery.

4. The nominal voltage identification method according to any one of claims 1 to 3, characterized in that The determining the nominal voltage of the battery according to the second voltage drop value includes: Determine the voltage drop threshold of the battery according to the initial nominal voltage; When the second voltage drop value is less than or equal to the voltage drop threshold, determine the nominal voltage one level higher than the initial nominal voltage as the nominal voltage of the battery.

5. A nominal voltage identification device, characterized in that, Including: An obtaining module, configured to obtain the initial voltage of the battery, and determine the initial nominal voltage of the battery according to the initial voltage; A first amplitude determining module, configured to perform constant current charging on the battery with a first preset current; When constant current charging for a first preset time period, determine the first voltage and the second voltage of the battery; the first voltage is the voltage before stopping charging, and the second voltage is the voltage after stopping charging for a second preset time period; Calculate the first voltage difference between the first voltage and the second voltage, and determine the first voltage difference as the first voltage drop value; A time determining module, configured to, when the first voltage drop value is less than or equal to the voltage drop threshold corresponding to the initial nominal voltage, perform constant voltage charging on the battery with the current voltage to reduce the charging current currently charging the battery; When the charging current decreases by a preset current value, determine the voltage drop time when the charging current decreases by the preset current value; A second amplitude determination module, configured to, when the voltage drop time is less than or equal to the voltage drop time corresponding to the initial nominal voltage, perform constant current charging on the battery with a second preset current; when the constant current charging reaches a preset gas evolution voltage, determine a third voltage and a fourth voltage of the battery; the third voltage is the voltage before stopping charging, and the fourth voltage is the voltage after stopping charging for a second preset time period; Calculate a second voltage difference between the third voltage and the fourth voltage, and determine the second voltage difference as a second voltage drop amplitude; A nominal voltage determination module, configured to determine the nominal voltage of the battery according to the second voltage drop amplitude.

6. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, the steps of a nominal voltage identification method according to any one of claims 1 to 4 are implemented.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, the steps of a nominal voltage identification method according to any one of claims 1 to 4 are implemented.

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