Battery capacity detection method, device, equipment and readable storage medium

Abstract

Embodiments of the present invention disclose a battery capacity detection method, device, equipment, and readable storage medium, which relate to the field of battery detection. The method includes: obtaining a target charging duration required for a target battery in a service state to perform a target charging operation under target charging conditions; matching among multiple to-be-matched charging conditions according to the target charging conditions to obtain a reference charging duration, where the to-be-matched charging condition corresponding to the reference charging duration is the same as the target charging conditions; calculating a duration ratio of the target charging duration to the reference charging duration, and using the duration ratio as the percentage of the remaining capacity of the target battery in the service state. In this way, a single target charging operation is performed to obtain the target charging duration, and the target charging conditions are matched with the to-be-matched data, and then the obtained target charging duration is calculated with the reference charging duration, and the finally obtained duration ratio can reflect the remaining capacity of the current target battery in the service state.

Description

Technical Field

[0001] The present invention relates to the field of battery detection, and in particular, to a battery capacity detection method, device, equipment and readable storage medium. Background Art

[0002] Currently, the remaining capacity of a lithium battery is mainly evaluated through the user's intuitive feelings such as the obvious reduction in the cruising range after the battery has been used for a period of time, resulting in low accuracy in the performance evaluation of the lithium battery. As a result, problems with the battery state may not be discovered in a timely manner, which may also lead to safety accidents. Therefore, how to monitor the remaining capacity of the in-service battery in real time is a technical problem that urgently needs to be solved. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art, and provide a battery capacity detection method, device, equipment and readable storage medium, which match the target charging duration required for charging the in-service battery under the target charging conditions in the to-be-matched data, so as to determine the remaining battery capacity of the in-service battery according to the target charging duration and the matched reference charging duration.

[0004] The present invention provides the following technical solutions:

[0005] In a first aspect, the present invention proposes a battery capacity detection method, the method comprising:

[0006] Obtaining a target charging duration required for performing a target charging operation on a target battery in a service state under target charging conditions;

[0007] Matching according to the target charging conditions among a plurality of to-be-matched charging conditions to obtain a reference charging duration, each to-be-matched charging condition corresponding to a to-be-matched charging duration, the to-be-matched charging duration being the charging duration required for performing a pre-charging operation on the target battery in an unused state under the to-be-matched charging conditions corresponding to the to-be-matched charging duration; the to-be-matched charging condition corresponding to the reference charging duration is the same as the target charging condition;

[0008] Calculating a duration ratio of the target charging duration to the reference charging duration, and taking the duration ratio as the percentage of the remaining battery capacity of the target battery in the service state.

[0009] In an embodiment, matching according to the target charging conditions among a plurality of to-be-matched charging conditions to obtain a reference charging duration, comprising:

[0010] Taking the to-be-matched charging condition that is the same as the target charging condition among the to-be-matched charging conditions as the reference charging condition;

[0011] Taking the to-be-matched charging duration corresponding to the reference charging condition as the reference charging duration.

[0012] In one embodiment, the target charging condition includes a target charging start temperature, a target charging start voltage, and a target charging end voltage. Obtaining the target charging duration required for the target battery in the service state to perform the target charging operation under the target charging condition includes:

[0013] Before the target charging operation, determine the target charging start voltage and the target charging end voltage according to the battery parameters of the target battery, and determine the target charging start temperature;

[0014] Obtain the first battery voltage of the target battery in the service state. If the first battery voltage is the target charging start voltage, obtain the first battery temperature of the target battery in the service state at the target charging start voltage, use the first battery temperature as the target charging start temperature, and at the target charging start temperature, perform the target charging operation on the target battery in the service state according to the target charging start voltage and the target charging end voltage to obtain the target charging duration.

[0015] In one embodiment, the to-be-matched charging condition includes a to-be-matched charging start temperature, a to-be-matched charging start voltage, and a to-be-matched charging end voltage. The method further includes:

[0016] For each pre-charging operation, before the pre-charging operation, respectively obtain the second battery voltage and the second battery temperature of the target battery in the non-service state to obtain the to-be-matched charging start voltage and the to-be-matched charging start temperature;

[0017] Determine the to-be-matched charging end voltage corresponding to the to-be-matched charging start voltage;

[0018] At the to-be-matched charging start temperature, perform the pre-charging operation on the target battery in the non-service state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage to obtain the to-be-matched charging duration.

[0019] In one embodiment, both the target charging condition and the to-be-matched charging condition further include a specific charging current;

[0020] Performing the target charging operation on the target battery in the service state according to the target charging start voltage and the target charging end voltage at the target charging start temperature includes:

[0021] Performing the target charging operation on the target battery in the service state according to the target charging start voltage and the target charging end voltage at the specific charging current and the target charging start temperature;

[0022] Performing the pre-charging operation on the target battery in the non-service state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage at the to-be-matched charging start temperature includes:

[0023] At a specific charging current and a target charging start temperature to be matched, a pre-charging operation is performed on a target battery in an unused state according to the target charging start voltage to be matched and its corresponding target charging end voltage to be matched.

[0024] In one embodiment, the battery parameters include the number of series-connected battery cells, the upper working voltage of a single battery cell, and the rated voltage of the battery cell. Before the target charging operation, the target charging start voltage and the target charging end voltage are determined according to the battery parameters of the target battery, and the target charging start temperature is determined, including:

[0025] Determine a first start voltage limit value according to the number of series-connected battery cells and the rated voltage of the battery cell, and determine the target charging start voltage according to the first start voltage limit value;

[0026] Determine a first end voltage limit value according to the number of series-connected battery cells and the upper working voltage of a single battery cell, and determine the target charging end voltage according to the first end voltage limit value.

[0027] In one embodiment, before the target charging operation, the target charging start voltage and the target charging end voltage are determined according to the battery parameters of the target battery, and the target charging start temperature is determined, further including:

[0028] Obtain the battery service time of the target battery in a used state;

[0029] Determine a basic convergence value according to the number of series-connected battery cells and a preset value;

[0030] Converge the first start voltage limit value and the first end voltage limit value respectively according to the battery service time and the basic convergence value to obtain a second start voltage limit value and a second end voltage limit value;

[0031] Determine the target charging start voltage according to the second start voltage limit value, and determine the target charging end voltage according to the second end voltage limit value.

[0032] In a second aspect, the present invention provides a battery capacity detection device, the device includes:

[0033] An acquisition module, configured to acquire the target charging duration required for the target battery in a used state to perform a target charging operation under target charging conditions;

[0034] A matching module, configured to match among a plurality of charging conditions to be matched according to the target charging conditions to obtain a reference charging duration, each charging condition to be matched corresponds to a charging duration to be matched, and the charging duration to be matched is the charging duration required for the target battery in an unused state to perform a pre-charging operation under the charging conditions to be matched corresponding to the charging duration to be matched; the charging conditions to be matched corresponding to the reference charging duration are the same as the target charging conditions;

[0035] A calculation module is configured to calculate a duration ratio of a target charging duration to a reference charging duration, and use the duration ratio as a percentage of the remaining capacity of the target battery in the in-service state.

[0036] In a third aspect, the present invention provides an electronic device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the battery capacity detection method according to the first aspect is implemented.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the battery capacity detection method according to the first aspect is implemented.

[0038] The battery capacity detection method, device, equipment, and readable storage medium disclosed by the present invention obtain a target charging duration required for a target battery in an in-service state to perform a target charging operation under target charging conditions; match according to the target charging conditions among a plurality of to-be-matched charging conditions to obtain a reference charging duration. Each to-be-matched charging condition corresponds to a to-be-matched charging duration, and the to-be-matched charging duration is the charging duration required for the target battery in a non-in-service state to perform a pre-charging operation under the to-be-matched charging conditions corresponding to the to-be-matched charging duration; the to-be-matched charging condition corresponding to the reference charging duration is the same as the target charging condition; calculate a duration ratio of the target charging duration to the reference charging duration, and use the duration ratio as a percentage of the remaining capacity of the target battery in the in-service state. In this way, by setting the target charging conditions, a single target charging operation is performed to obtain the target charging duration, and according to the target charging conditions, matching is performed from the previously obtained to-be-matched charging conditions and to-be-matched charging durations to obtain the reference charging duration corresponding to the target charging conditions, and then the obtained target charging duration and the reference charging duration are subjected to ratio calculation. Finally, the obtained duration ratio can reflect the remaining capacity of the current target battery in the in-service state. At the same time, the single target charging operation and the matching of the reference charging duration make the battery capacity detection process simpler, do not require excessive costs, and improve the efficiency of battery capacity detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the protection scope of the present invention. In each drawing, similar components are numbered similarly.

[0040] Figure 1 FIG. 1 shows a schematic flowchart of the battery capacity detection method proposed in this embodiment;

[0041] Figure 2Shows another schematic flowchart of the battery capacity detection method proposed in this embodiment;

[0042] Figure 3 Shows yet another schematic flowchart of the battery capacity detection method proposed in this embodiment;

[0043] Figure 4 Shows still another schematic flowchart of the battery capacity detection method proposed in this embodiment;

[0044] Figure 5 Shows yet another schematic flowchart of the battery capacity detection method proposed in this embodiment;

[0045] Figure 6 Shows a comparison schematic diagram of the charging curves proposed in this embodiment;

[0046] Figure 7 Shows a schematic structural diagram of the battery capacity detection device proposed in this embodiment.

[0047] Explanation of the reference numerals in the drawings: 700 - battery capacity detection device; 701 - acquisition module; 702 - matching module; 703 - calculation module. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0049] Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0050] Hereinafter, the terms "including", "having" and their cognates that can be used in various embodiments of the present invention are only intended to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be construed as first excluding the existence or adding the possibility of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0051] In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0052] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention pertain. Terms (such as those defined in a commonly used dictionary) will be interpreted as having the same meaning as their contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in various embodiments of the present invention.

[0053] Embodiment 1

[0054] An embodiment of the present disclosure provides a method for detecting battery capacity, which is used to match the target charging duration required for charging a serviced battery under target charging conditions in the data to be matched, so as to determine the remaining battery capacity of the serviced battery according to the target charging duration and the matched reference charging duration.

[0055] Please refer to Figure 1 , the battery capacity detection method includes steps S101 to S103, and the following will explain each step in detail.

[0056] Step S101, obtain the target charging duration required for the target battery in the serviced state to perform the target charging operation under the target charging conditions.

[0057] It should be noted that after the target battery is in service, as the service time gets longer, the remaining capacity of the target battery will change, and thus the battery performance will also change. Therefore, it is necessary to detect the remaining capacity of the target battery in a timely manner to avoid failing to detect problems with the target battery in a timely manner.

[0058] In this embodiment, obtain the target charging duration required for the target battery in the serviced state to perform the target charging operation under the target charging conditions. For example, the target charging conditions may include current, voltage, temperature, etc.

[0059] Please refer to Figure 2 , in a specific embodiment, the target charging conditions include the target charging start temperature, the target charging start voltage, and the target charging end voltage. Step S101 includes steps S1011 to S1012, and the following will explain each step in detail.

[0060] Step S1011, before the target charging operation, determine the target charging start voltage and the target charging end voltage according to the battery parameters of the target battery.

[0061] In this embodiment, in the target charging operation, there are specific requirements for the target charging start voltage and the target charging end voltage, that is, there are specific requirements for the charging start and end range in the target charging operation. It is necessary to obtain specific target charging start voltage values and target charging end voltage values according to the battery parameters of the target battery, so as to ensure that the target charging duration can accurately reflect the capacity of the current target battery.

[0062] Please refer to Figure 3 , in a specific embodiment, the battery parameters include the number of series-connected battery cells, the upper limit operating voltage of a single battery cell, and the rated voltage of the battery cell. Step S1011 includes steps S301 to S302, and the following is a detailed description of each step.

[0063] S301, determine the first start voltage limit according to the number of series-connected battery cells and the rated voltage of the battery cell, and determine the target charging start voltage according to the first start voltage limit.

[0064] In this embodiment, obtain the number of series-connected battery cells N, the upper limit operating voltage V max and the rated voltage V0 of the battery cell in the target battery.

[0065] Further, determine the first start voltage limit V i 1 according to the number of series-connected battery cells N and the rated voltage V0 of the battery cell, and determine the target charging start voltage V i 1 according to the first start voltage limit V i . Specifically, V i 1 = N×V0, V i ≥V i 1 .

[0066] S302, determine the first end voltage limit according to the number of series-connected battery cells and the upper limit operating voltage of a single battery cell, and determine the target charging end voltage according to the first end voltage limit.

[0067] In this embodiment, determine the first end voltage limit V max according to the number of series-connected battery cells N and the upper limit operating voltage V j 1 of a single battery cell, and determine the target charging end voltage V j 1 according to the first end voltage limit V j . Specifically, V j 1 = N×(V max - 0.05), V j ≤V j 1 .

[0068] It should be noted that, according to the first starting voltage limit V i 1 Determine the target charging start voltage V1, and according to the first termination voltage limit V j 1 Determine the target charge termination voltage V j It can be seen that the present embodiment does not require the battery to be fully charged and discharged, as long as it meets the conditions of a certain voltage range, which takes a short time and is convenient and fast; and full charging and discharging can obviously obtain capacity, but the application conditions in the market are complex, and most of the uses are not full charging and discharging (for example, 30-90%).

[0069] See also Figure 4 In a specific embodiment, step S1011 also includes steps S401 to S404, and each step is described in detail below.

[0070] Step S401, obtaining the battery service time of a target battery in a service state.

[0071] In this embodiment, the battery service time of the target battery in the service state is obtained, that is, the time from the time when the target battery was put into service to the present.

[0072] Step S402, determining a basic convergence value according to the battery cell series connection value and a preset value.

[0073] In this embodiment, the basic convergence value X is determined according to the number of cells connected in series N and the preset value M. Specifically, X=N×M, and the preset value M may be 0.05V.

[0074] Step S403: Converging the first starting voltage limit and the first ending voltage limit respectively according to the battery service time and the basic convergence value to obtain a second starting voltage limit and a second ending voltage limit.

[0075] In this embodiment, the first starting voltage limit V is set according to the battery service time V1 and the basic convergence value X. i 1 and the first termination voltage limit V j 1 After convergence, the second starting voltage limit V can be obtained. i 2 and the second termination voltage limit V j 2 .

[0076] Exemplarily, the warranty time V2 of the target battery is obtained; further, a reference ratio a is preset, and when the ratio b of the battery service time V1 to the warranty time V2 reaches the reference ratio a, the first starting voltage limit V i1 and the first termination voltage limit value V j 1 perform one convergence to obtain the second starting voltage limit value V i 2 and the second termination voltage limit value V j 2 . One convergence process includes: upwardly converging the base convergence value X for the first starting voltage limit value V i 1 , and downwardly converging the base convergence value X for the first termination voltage limit value V j 1 . Among them, the reference ratio a can be 30%.

[0077] Step S404, determine the target charging starting voltage according to the second starting voltage limit value, and determine the target charging termination voltage according to the second termination voltage limit value.

[0078] In this embodiment, according to the second starting voltage limit value V i 2 determine the target charging starting voltage V i , and according to the second termination voltage limit value V j 2 determine the target charging termination voltage V j . Exemplarily, V i ≥V i 2 , V j ≤V j 2 . In this way, by combining the battery service time and the battery warranty time to converge the first starting voltage limit value V i 1 and the first termination voltage limit value V j 1 , it can be further ensured that the finally obtained target charging duration can accurately reflect the battery capacity situation.

[0079] Step S1012, obtain the first battery voltage of the target battery in the serviced state. If the first battery voltage is the target charging starting voltage, obtain the first battery temperature of the target battery in the serviced state at the target charging starting voltage, use the first battery temperature as the target charging starting temperature, and at the target charging starting temperature, perform a target charging operation on the target battery in the serviced state according to the target charging starting voltage and the target charging termination voltage to obtain the target charging duration.

[0080] In this embodiment, the temperature monitoring device inside the target battery monitors the first battery temperature inside the target battery and the current first battery voltage. When the first battery voltage of the target battery in the service state is the target charging start voltage, the first temperature inside the target battery in the service state at this time is used as the target charging start temperature. Thus, at the target charging start temperature, a target charging operation is performed on the target battery in the service state according to the target charging start voltage and the target charging end voltage, and the target charging duration required from the target charging start voltage to the target charging end voltage is obtained.

[0081] It should be noted that the target charging start temperature can also be determined in advance. The target charging start temperature can be a temperature that is relatively easy to control. For example, 0 °C or room temperature. Then, the target battery in the service state is placed in an environment with a temperature of the target charging start temperature so that the internal temperature of the battery can reach the target charging start temperature.

[0082] Step S102, match according to the target charging conditions among multiple to-be-matched charging conditions to obtain a reference charging duration.

[0083] Each to-be-matched charging condition corresponds to a to-be-matched charging duration. The to-be-matched charging duration is the charging duration required for the target battery in the non-service state to perform a pre-charging operation under the to-be-matched charging condition corresponding to the to-be-matched charging duration; the to-be-matched charging condition corresponding to the reference charging duration is the same as the target charging condition.

[0084] In this embodiment, there is a mapping matrix. The mapping matrix includes multiple to-be-matched charging conditions and a to-be-matched charging duration corresponding to each to-be-matched charging condition respectively. Match according to the target charging conditions among the multiple to-be-matched charging conditions in the mapping matrix to obtain the to-be-matched charging duration corresponding to the target charging condition, and use this to-be-matched charging duration as the reference charging duration. The to-be-matched charging condition corresponding to the reference charging duration is exactly the same as the target charging condition, thereby ensuring that the subsequent battery remaining capacity result is more accurate.

[0085] Among them, for each to-be-matched charging duration, a pre-charging operation is performed on the target battery in the non-service state according to the to-be-matched charging condition corresponding to the to-be-matched charging duration, so as to obtain the to-be-matched charging duration. The to-be-matched charging condition can also include current, voltage, temperature, etc.

[0086] Please refer to Figure 5 , in a specific embodiment, the to-be-matched charging condition includes a to-be-matched charging start temperature, a to-be-matched charging start voltage, and a to-be-matched charging end voltage. The method further includes steps S501 - S502, and the following is a detailed description of each step.

[0087] Step S501: For each pre-charging operation, before the pre-charging operation, obtain the second battery voltage and the second battery temperature of the target battery in the non-service state respectively, so as to obtain the to-be-matched charging start voltage and the to-be-matched charging start temperature.

[0088] In this embodiment, for each pre-charging operation, before the pre-charging operation, obtain the second battery voltage and the second battery temperature of the target battery in the non-service state respectively, so as to obtain the to-be-matched charging start voltage and the to-be-matched charging start temperature. Among them, the second battery temperature can also reach the preset to-be-matched charging start temperature by changing the temperature environment of the target battery in the non-service state; the second battery temperature is the internal battery temperature of the target battery in the non-service state at the second battery voltage, and the to-be-matched charging start temperature is the internal battery temperature of the target battery in the non-service state at the to-be-matched charging start voltage. Therefore, the finally obtained mapping matrix can be divided according to different to-be-matched charging start temperatures, and each mapping matrix corresponds to a to-be-matched charging start temperature, and the matrix includes multiple to-be-matched charging start and end voltage intervals at this to-be-matched charging start temperature.

[0089] Step S502: Determine the to-be-matched charging end voltage corresponding to the to-be-matched charging start voltage; at the to-be-matched charging start temperature, perform a pre-charging operation on the target battery in the non-service state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage, so as to obtain the to-be-matched charging duration.

[0090] In this embodiment, for each pre-charging operation, before the pre-charging operation, determine the to-be-matched charging end voltage corresponding to the to-be-matched charging start voltage; at the to-be-matched charging start temperature, perform a pre-charging operation on the target battery in the non-service state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage, so as to obtain the to-be-matched charging duration required from the to-be-matched charging start voltage to the corresponding to-be-matched charging end voltage.

[0091] In a specific embodiment, step S102 includes: taking the to-be-matched charging conditions that are the same as the target charging condition among the to-be-matched charging conditions as the reference charging conditions; taking the to-be-matched charging duration corresponding to the reference charging conditions as the reference charging duration.

[0092] In this embodiment, take the to-be-matched charging conditions that are the same as the target charging condition among the to-be-matched charging conditions as the reference charging conditions; take the to-be-matched charging duration corresponding to the reference charging conditions as the reference charging duration. In this way, by matching the target charging conditions through the pre-obtained to-be-matched charging conditions and their to-be-matched charging durations, the efficiency of battery capacity detection is improved.

[0093] In a specific embodiment, the target charging condition and the charging condition to be matched both further include a specific charging current; step S1012 includes: performing a target charging operation on the target battery in the service state according to the target charging start voltage and the target charging end voltage at the specific charging current and the target charging start temperature; step S502 includes: performing a pre-charging operation on the target battery in the non-service state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage at the specific charging current and the to-be-matched charging start temperature.

[0094] In this embodiment, the target charging condition and the charging condition to be matched both further include a specific charging current. For step S1012, at the specific charging current and based on the target charging start temperature, a target charging operation can be performed on the target battery in the service state according to the target charging start voltage and the target charging end voltage. Correspondingly, for step S502, at the specific charging current and based on the to-be-matched charging start temperature, a pre-charging operation can be performed on the target battery in the non-service state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage. Among them, the magnitude of the specific charging current can be lower than 0.2 times the rated capacity or be consistent with the charging current of the charging device providing the charge. In this way, the accuracy of battery capacity detection can be achieved through the setting of the specific charging current.

[0095] Step S103: Calculate the ratio of the target charging duration to the reference charging duration, and use the duration ratio as the percentage of the remaining capacity of the target battery in the service state.

[0096] In this embodiment, calculate the ratio of the target charging duration to the reference charging duration, and use this duration ratio as the percentage of the remaining capacity of the target battery in the current service state, so as to achieve the detection of the battery capacity. In this way, by setting the target charging condition, a single target charging operation is performed to obtain the target charging duration, and according to the target charging condition, the to-be-matched charging condition and the to-be-matched charging duration obtained in advance are matched to obtain the reference charging duration corresponding to the target charging condition. Then, the obtained target charging duration and the reference charging duration are subjected to ratio calculation. Finally, the obtained duration ratio can reflect the remaining capacity of the current target battery in the service state. At the same time, the single target charging operation and the matching of the reference charging duration make the battery capacity detection process simpler and do not require excessive cost.

[0097] First exemplarily, select a 24Ah cell to form a target battery A0 with 1 parallel and 13 series.

[0098] When the target battery A0 is not in service, charge the target battery A0 at a specific charging current of 4.8A at room temperature, record the voltage-time curve, and obtain the charging curve of the non-service target battery A0 (new target battery A0).

[0099] Then, the un-serviced target battery A0 is subjected to a cyclic test with charge and discharge currents of 12 A / 12 A respectively, and the test stops after reaching 200 cycles. The battery capacities at the first and last cycles are recorded as 24.3 Ah and 22.4 Ah respectively. It can be seen that the actual capacity retention rate of the serviced target battery A1 is 92.2%.

[0100] Then, the serviced target battery A1 is charged with a specific charging current of 4.8 A, and the voltage-time curve is recorded. Among them, the target charging time from the target starting charging voltage V i = 47.5 V to the target ending voltage V j = 48.5 V is 2480 s.

[0101] Looking up the charging curve of the un-serviced target battery A0 (new target battery A0), the reference charging duration from 47.5 V to 48.5 V is 2810 s. Dividing 2480 s by 2810 s gives a remaining capacity of 88.3%. The deviation from the actual capacity decay is within 5%.

[0102] Second exemplarily, the un-serviced target battery A0 is charged at a specific charging current of 2.4 A at room temperature, and the voltage-time curve is recorded to obtain the charging curve of the un-serviced target battery A0 (new target battery) at room temperature.

[0103] Then, the serviced target battery A1 is charged at a specific charging current of 2.4 A at room temperature, and the voltage-time curve is recorded. Among them, the target charging time from the target starting charging voltage V i = 47.5 V to the target ending voltage V j = 48.5 V is 4980 s.

[0104] Looking up the charging curve of the un-serviced target battery A0 (new target battery), the reference charging duration from 47.5 V to 48.5 V at room temperature is 5560 s. Finally, the calculated remaining capacity is 89.6%, and the deviation from the actual capacity decay is within 3%.

[0105] Third exemplarily, a 12 Ah cell is selected to form a target battery B0 with 1 parallel and 10 series.

[0106] The un-serviced target battery B0 is placed at 0 °C for 16 h, and then the un-serviced target battery B0 is charged with 1.2 A, and the voltage-time curve is recorded to obtain the charging curve of the un-serviced target battery B0 at 0 °C.

[0107] Then, the unused target battery B0 was taken out and left at room temperature for 16 h, and then a cycle test with charge and discharge currents of 6 A / 6 A was carried out. After 100 cycles, the test was stopped. The battery capacities at the first and last cycles were recorded as 12.5 Ah and 11.8 Ah respectively, and the actual capacity retention rate of the used target battery B1 was 94.4%.

[0108] Then, the used target battery B1 was placed at 0 °C for 16 h, and then the used target battery B1 was charged with a specific charging current of 1.2 A, and the voltage-time curve was recorded. Among them, the time t1 from the target starting charging voltage V i = 39.0 V to the target termination voltage V j = 39.5 V was 5180 s.

[0109] By referring to the charging curve of the unused target battery B0 at 0 °C, the target charging duration from V0 = 39.0 V to V1 = 39.5 V was 5730 s, and the remaining capacity was finally calculated to be 90.4%. The deviation from the actual capacity attenuation was within 5%.

[0110] Please refer to Figure 6 , according to the comparison between the charging curves of the used battery after 600 charge and discharge cycles of the unused battery at the internal charging starting temperature of the same battery and the charging curve of the new unused battery at the factory, it can be seen that at the same temperature, the initial voltage and termination voltage of the new unused battery and the used battery during charging are the same. Since the curve difference is not significant, it is equivalent that the percentage of the charge amount charged into both is the same. That is: Because the charging current is kept consistent, that is, I0 = I1, therefore,

[0111] The battery capacity detection method proposed in this embodiment obtains the target charging duration required for a target battery in a service state to perform a target charging operation under target charging conditions; matches the target charging conditions among multiple charging conditions to be matched to obtain a reference charging duration, where each charging condition to be matched corresponds to a charging duration to be matched, and the charging duration to be matched is the charging duration required for the target battery in an unserviced state to perform a pre-charging operation under the charging conditions to be matched corresponding to the charging duration to be matched; the charging conditions to be matched corresponding to the reference charging duration are the same as the target charging conditions; calculates the duration ratio of the target charging duration to the reference charging duration, and uses the duration ratio as the percentage of the remaining battery capacity of the target battery in the service state. In this way, by setting the target charging conditions, a single target charging operation is performed to obtain the target charging duration, and according to the target charging conditions, matching is performed from the pre-obtained charging conditions to be matched and the charging durations to be matched to obtain the reference charging duration corresponding to the target charging conditions, and then the obtained target charging duration is compared with the reference charging duration. The calculated ratio can reflect the remaining capacity of the current target battery in the service state. At the same time, the single target charging operation and the matching of the reference charging duration make the battery capacity detection process simpler, do not require excessive costs, and improve the efficiency of battery capacity detection.

[0112] Embodiment 2

[0113] In addition, an embodiment of the present disclosure provides a battery capacity detection device 700. Please refer to Figure 7 , the device includes:

[0114] An acquisition module 701, configured to acquire the target charging duration required for a target battery in a service state to perform a target charging operation under target charging conditions;

[0115] A matching module 702, configured to match the target charging conditions among multiple charging conditions to be matched to obtain a reference charging duration, where each charging condition to be matched corresponds to a charging duration to be matched, and the charging duration to be matched is the charging duration required for the target battery in an unserviced state to perform a pre-charging operation under the charging conditions to be matched corresponding to the charging duration to be matched; the charging conditions to be matched corresponding to the reference charging duration are the same as the target charging conditions;

[0116] A calculation module 703, configured to calculate the duration ratio of the target charging duration to the reference charging duration, and use the duration ratio as the percentage of the remaining battery capacity of the target battery in the service state.

[0117] Optionally, the matching module 702 is configured to use the charging conditions to be matched that are the same as the target charging conditions among the charging conditions to be matched as the reference charging conditions; and use the charging duration to be matched corresponding to the reference charging conditions as the reference charging duration.

[0118] Optionally, the target charging conditions include a target charging start temperature, a target charging start voltage, and a target charging end voltage. The obtaining module 701 is configured to, before the target charging operation, determine the target charging start voltage and the target charging end voltage according to the battery parameters of the target battery; obtain a first battery voltage of the target battery in a service state. If the first battery voltage is the target charging start voltage, obtain a first battery temperature of the target battery in the service state at the target charging start voltage, use the first battery temperature as the target charging start temperature, and perform a target charging operation on the target battery in the service state according to the target charging start voltage and the target charging end voltage at the target charging start temperature to obtain a target charging duration.

[0119] Optionally, the charging conditions to be matched include a charging start temperature to be matched, a charging start voltage to be matched, and a charging end voltage to be matched. The obtaining module 701 is configured to, for each pre-charging operation, before the pre-charging operation, respectively obtain a second battery voltage and a second battery temperature of the target battery in an unserviced state to obtain the charging start voltage to be matched and the charging start temperature to be matched; determine the charging end voltage to be matched corresponding to the charging start voltage to be matched; perform a pre-charging operation on the target battery in the unserviced state according to the charging start voltage to be matched and the corresponding charging end voltage to be matched at the charging start temperature to be matched to obtain a charging duration to be matched.

[0120] Optionally, both the target charging conditions and the charging conditions to be matched further include a specific charging current;

[0121] The obtaining module 701 is configured to perform a target charging operation on the target battery in a service state according to the target charging start voltage and the target charging end voltage at the specific charging current and the target charging start temperature;

[0122] The obtaining module 701 is configured to perform a pre-charging operation on the target battery in an unserviced state according to the charging start voltage to be matched and the corresponding charging end voltage to be matched at the specific charging current and the charging start temperature to be matched.

[0123] Optionally, the battery parameters include the number of series-connected battery cells, the upper limit operating voltage of a single battery cell, and the rated voltage of the battery cell. The obtaining module 701 is configured to determine a first start voltage limit according to the number of series-connected battery cells and the rated voltage of the battery cell, and determine the target charging start voltage according to the first start voltage limit; determine a first end voltage limit according to the number of series-connected battery cells and the upper limit operating voltage of a single battery cell, and determine the target charging end voltage according to the first end voltage limit.

[0124] Optionally, an acquisition module 701 is configured to acquire the battery service time of a target battery in a service state; determine a basic convergence value according to the cell series value and a preset value; converge the first starting voltage limit value and the first ending voltage limit value respectively according to the battery service time and the basic convergence value to obtain a second starting voltage limit value and a second ending voltage limit value; determine a target charging starting voltage according to the second starting voltage limit value, and determine a target charging ending voltage according to the second ending voltage limit value.

[0125] The device provided in the embodiments of the present disclosure can execute the steps of the battery capacity detection method provided in Embodiment 1. To avoid repetition, details are not described herein again.

[0126] The battery capacity detection device proposed in this embodiment acquires the target charging duration required for a target battery in a service state to perform a target charging operation under target charging conditions; matches the target charging conditions among multiple to-be-matched charging conditions to obtain a reference charging duration. Each to-be-matched charging condition corresponds to a to-be-matched charging duration, and the to-be-matched charging duration is the charging duration required for a target battery in a non-service state to perform a pre-charging operation under the to-be-matched charging conditions corresponding to the to-be-matched charging duration; the to-be-matched charging condition corresponding to the reference charging duration is the same as the target charging condition; calculates the duration ratio of the target charging duration to the reference charging duration, and uses the duration ratio as the percentage of the remaining battery capacity of the target battery in the service state. In this way, by setting the target charging conditions, a single target charging operation is performed to obtain the target charging duration, and according to the target charging conditions, matching is performed from the pre-obtained to-be-matched charging conditions and to-be-matched charging durations to obtain the reference charging duration corresponding to the target charging conditions, and then the obtained target charging duration and the reference charging duration are calculated for their ratio. Finally, the obtained duration ratio can reflect the remaining capacity of the current target battery in the service state. At the same time, the single target charging operation and the matching of the reference charging duration make the battery capacity detection process simpler, do not require excessive costs, and improve the efficiency of battery capacity detection.

[0127] Embodiment 3

[0128] In addition, the embodiments of the present disclosure provide a computer device, including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the battery capacity detection method of Embodiment 1 is implemented.

[0129] The device provided in the embodiments of the present disclosure can execute the steps of the battery capacity detection method provided in Embodiment 1. To avoid repetition, details are not described herein again.

[0130] Embodiment 4

[0131] An embodiment of the present disclosure provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the battery capacity detection method of Embodiment 1 of the present disclosure.

[0132] In this embodiment, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disc, or the like.

[0133] The computer-readable storage medium provided in this embodiment can implement the battery capacity detection method provided in Embodiment 1. To avoid repetition, it will not be elaborated here.

[0134] In all the examples shown and described here, any specific value should be construed as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0135] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0136] The above embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A battery capacity detection method, characterized in that, The method includes: Obtaining a target charging duration required for a target battery in a serviced state to perform a target charging operation under target charging conditions; Matching according to the target charging conditions among a plurality of to-be-matched charging conditions to obtain a reference charging duration, each of the to-be-matched charging conditions corresponding to a to-be-matched charging duration, where the to-be-matched charging duration is the charging duration required for a target battery in an unserviced state to perform a pre-charging operation under the to-be-matched charging conditions corresponding to the to-be-matched charging duration; the to-be-matched charging conditions corresponding to the reference charging duration are the same as the target charging conditions; Calculating a duration ratio of the target charging duration to the reference charging duration, and taking the duration ratio as a percentage of the remaining battery capacity of the target battery in the serviced state; Wherein, the target charging conditions include a target charging start voltage and a target charging end voltage; The battery parameters of the target battery include the number of series-connected battery cells, the upper working voltage of a single battery cell, and the rated voltage of the battery cell. A first start voltage limit value is determined according to the number of series-connected battery cells and the rated voltage of the battery cell, and a first end voltage limit value is determined according to the number of series-connected battery cells and the upper working voltage of a single battery cell; Obtaining the battery service time of the target battery in the serviced state; Determining a basic convergence value according to the number of series-connected battery cells and a preset value; Converging the first start voltage limit value and the first end voltage limit value respectively according to the battery service time and the basic convergence value to obtain a second start voltage limit value and a second end voltage limit value; Determining the target charging start voltage according to the second start voltage limit value, and determining the target charging end voltage according to the second end voltage limit value.

2. The battery capacity detection method according to claim 1, wherein The matching according to the target charging conditions among a plurality of to-be-matched charging conditions to obtain a reference charging duration includes: Regarding the to-be-matched charging conditions that are the same as the target charging conditions among the to-be-matched charging conditions as reference charging conditions; Taking the to-be-matched charging duration corresponding to the reference charging conditions as the reference charging duration.

3. The battery capacity detection method according to claim 1, wherein The target charging conditions further include a target charging start temperature. The obtaining of the target charging duration required for a target battery in a serviced state to perform a target charging operation under target charging conditions includes: Obtaining a first battery voltage of the target battery in the serviced state. If the first battery voltage is the target charging start voltage, obtaining a first battery temperature of the target battery in the serviced state at the target charging start voltage, taking the first battery temperature as the target charging start temperature, and performing the target charging operation on the target battery in the serviced state according to the target charging start voltage and the target charging end voltage at the target charging start temperature to obtain the target charging duration.

4. The battery capacity detection method according to claim 3, characterized in that, The to-be-matched charging conditions include a to-be-matched charging start temperature, a to-be-matched charging start voltage, and a to-be-matched charging end voltage. The method further includes: For each of the pre-charging operations, before the pre-charging operation, obtain the second battery voltage and the second battery temperature of the target battery in the non-serviced state respectively, so as to obtain the to-be-matched charging start voltage and the to-be-matched charging start temperature; Determine the to-be-matched charging end voltage corresponding to the to-be-matched charging start voltage; At the to-be-matched charging start temperature, perform the pre-charging operation on the target battery in the non-serviced state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage, so as to obtain the to-be-matched charging duration; 5. The battery capacity detection method according to claim 4, characterized in that Both the target charging condition and the to-be-matched charging condition further include a specific charging current; The performing the target charging operation on the target battery in the serviced state according to the target charging start voltage and the target charging end voltage at the target charging start temperature includes: At the specific charging current and the target charging start temperature, perform the target charging operation on the target battery in the serviced state according to the target charging start voltage and the target charging end voltage; The performing the pre-charging operation on the target battery in the non-serviced state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage at the to-be-matched charging start temperature includes: At the specific charging current and the to-be-matched charging start temperature, perform the pre-charging operation on the target battery in the non-serviced state according to the to-be-matched charging start voltage and its corresponding to-be-matched charging end voltage; 6. A battery capacity detection device, characterized in that, The device includes: An acquisition module, configured to acquire the target charging duration required for performing a target charging operation on a target battery in a serviced state under a target charging condition; the target charging condition includes a target charging start voltage and a target charging end voltage; A matching module, configured to perform matching among a plurality of to-be-matched charging conditions according to the target charging condition to obtain a reference charging duration, each of the to-be-matched charging conditions corresponds to a to-be-matched charging duration, and the to-be-matched charging duration is the charging duration required for performing a pre-charging operation on a target battery in a non-serviced state under the to-be-matched charging condition corresponding to the to-be-matched charging duration; the to-be-matched charging condition corresponding to the reference charging duration is the same as the target charging condition; A calculation module, configured to calculate a duration ratio of the target charging duration to the reference charging duration, and use the duration ratio as the percentage of the remaining battery capacity of the target battery in the serviced state; The battery parameters of the target battery include the number of series-connected battery cells, the upper limit of the working voltage of a single battery cell, and the rated voltage of the battery cell. The obtaining module is further configured to determine a first starting voltage limit value according to the number of series-connected battery cells and the rated voltage of the battery cell, and determine a first termination voltage limit value according to the number of series-connected battery cells and the upper limit of the working voltage of a single battery cell; obtain the battery service time of the target battery in the service state; determine a basic convergence value according to the number of series-connected battery cells and a preset value; converge the first starting voltage limit value and the first termination voltage limit value respectively according to the battery service time and the basic convergence value to obtain a second starting voltage limit value and a second termination voltage limit value; determine the target charging starting voltage according to the second starting voltage limit value, and determine the target charging termination voltage according to the second termination voltage limit value.

7. An electronic device, characterized in that, It includes a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, it implements the battery capacity detection method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, It stores a computer program, and when the computer program is executed by the processor, it implements the battery capacity detection method according to any one of claims 1 to 5.

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