Battery charging cut-off voltage testing method, device, electronic device and storage medium

Abstract

The present invention discloses a battery charging cutoff voltage test method, device, electronic device, and storage medium. The method includes: dividing the charging process into n charging stages according to the battery's charging capacity; obtaining the charging capacity of each charging stage when the charge state is an upper limit value; obtaining the charging capacity of the n-1th charging stage and the charging capacity of the n-th charging stage when the charge state is K times the upper limit value based on the charging capacity and the charging capacity relationship of each charging stage when the charge state is the upper limit value; wherein K is greater than 0 and less than 1; determining the charging cutoff voltage when the charge state is K times the upper limit value based on the cutoff voltage when the charge state is the upper limit value, the charging capacity of the n-1th charging stage, and the charging capacity of the n-th charging stage when the charge state is K times the upper limit value. The technical solution provided by the present invention reduces the complexity of the testing process and improves testing efficiency.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of battery charging, and in particular to a method, device, electronic device, and storage medium for testing a battery charging cut-off voltage. Background Art

[0002] The power of electric vehicles mainly comes from the battery system, and the power of the battery system directly affects the range of the vehicle. In order to meet the requirements of the vehicle's range, the battery system needs to be charged with sufficient power while taking into account safety and battery life requirements.

[0003] At present, the main methods for measuring the cut-off voltage of batteries include differential amplifier isolation detection, voltage partial voltage isolation detection, and photoelectric relay isolation detection, but the testing process is cumbersome and reduces measurement efficiency. Summary of the Invention

[0004] The present invention provides a battery charging cut-off voltage testing method, device, electronic equipment and storage medium, which reduce the complexity of the testing process and improve the testing efficiency.

[0005] In a first aspect, an embodiment of the present invention provides a method for testing a battery charging cut-off voltage, characterized by comprising:

[0006] The charging process is divided into n charging stages according to the charging capacity of the battery; wherein n is greater than 1 and is a positive integer;

[0007] Obtaining the charging capacity of each charging stage when the state of charge is an upper limit value;

[0008] According to the charging capacity and charging capacity relationship of each charging stage with the charge state being the upper limit value, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage with the charge state being K times the upper limit value are obtained; wherein K is greater than 0 and less than 1; the charging capacity relationship is:

[0009] (c n-1 +c n )-(c' n-1 +c' n )=(1-K)c;c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage; c n-1 c is the charging capacity of the n-1th charging stage when the state of charge is the upper limit value; n is the charging capacity of the nth charging stage when the state of charge is the upper limit; c is the total charging capacity when the state of charge is the upper limit; where c' n-1 ≤c n-1 and c' n ≤cn ;

[0010] The charging cutoff voltage when the state of charge is K times the upper limit value is determined according to the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage.

[0011] Optionally, determining the charging cutoff voltage when the state of charge is K times the upper limit value according to the cutoff voltage when the state of charge is the upper limit value, the charging capacity in the (n-1)th charging stage when the state of charge is K times the upper limit value, and the charging capacity in the nth charging stage includes:

[0012] charging the battery according to the charging capacity of the first n-2 charging stages when the state of charge is the upper limit value and the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, wherein n is greater than 2;

[0013] After the charging of the n-1th charging stage is completed, the nth charging stage is entered, and after the charging of the nth charging stage is completed, the maximum single cell voltage of the battery is measured;

[0014] When the maximum cell voltage is less than the cut-off voltage when the state of charge is an upper limit value, the maximum cell voltage is determined to be the charging cut-off voltage when the state of charge is K times the upper limit value.

[0015] Optionally, obtaining the charging capacity of each charging stage where the state of charge is an upper limit value includes:

[0016] Obtaining the preset charging capacity and the preset charging current multiple for the first n-1 charging stages;

[0017] Charging the first n-1 charging stages according to the preset charging capacity and the preset charging current multiple;

[0018] After the first n-1 charging stages are completed, the battery is charged in the nth charging stage, and the charging time is recorded when the battery is charged to the cut-off voltage at the upper limit value of the charge state;

[0019] According to the relationship between the charging time and the preset time, the charging capacity and the charging current multiple of each charging stage in which the charge state is an upper limit value are determined.

[0020] Optionally, determining the charging capacity and charging current multiple of each charging stage in which the state of charge is an upper limit value according to the relationship between the charging time and the preset time includes:

[0021] If the charging time exceeds the preset time, the preset charging capacity and / or the preset charging current multiple of at least one of the first n-1 charging stages are adjusted, and the charging time of the nth charging stage is obtained again until the charging time is less than or equal to the preset time, thereby determining the charging capacity and the charging current multiple of each charging stage.

[0022] Optionally, the charging capacity is the product of the charging time and the charging current; wherein the charging current is the product of the charging current multiple and the rated current;

[0023] After determining the charging cutoff voltage when the state of charge is K times the upper limit value based on the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage, the method further includes:

[0024] The charging time of each charging stage in which the state of charge is K times the upper limit value is determined according to the charging capacity and the charging current.

[0025] Optionally, the product of the charging current multiple and the rated current is less than or equal to the maximum charging current allowed by the battery.

[0026] Optionally, the charging capacity in each charging stage is smaller than the rated capacity of the battery.

[0027] In a second aspect, an embodiment of the present invention provides a battery charging cut-off voltage testing device, comprising:

[0028] A division module, configured to divide the charging process into n charging stages according to the charging capacity of the battery; wherein n is greater than 1 and is a positive integer;

[0029] an acquisition module, configured to acquire the charging capacity of each charging stage when the state of charge is an upper limit value;

[0030] A setting module is configured to obtain, based on the charging capacity and the charging capacity relationship of each charging stage where the state of charge is the upper limit value, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage where the state of charge is K times the upper limit value; wherein K is greater than 0 and less than 1; and the charging capacity relationship is:

[0031] (c n-1 +c n )-(c' n-1 +c' n )=(1-K)c;c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage; c n-1c is the charging capacity of the n-1th charging stage when the state of charge is the upper limit value; n is the charging capacity of the nth charging stage when the state of charge is the upper limit; c is the total charging capacity when the state of charge is the upper limit; where c' n-1 ≤c n-1 and c' n ≤c n ;

[0032] The determination module is used to determine the charging cutoff voltage when the charge state is K times the upper limit value according to the cutoff voltage when the charge state is the upper limit value, the charging capacity of the n-1th charging stage when the charge state is K times the upper limit value, and the charging capacity of the nth charging stage.

[0033] In a third aspect, an embodiment of the present invention provides an electronic device, comprising:

[0034] at least one processor; and

[0035] a memory communicatively connected to the at least one processor; wherein,

[0036] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the battery charging cut-off voltage testing method described in any embodiment of the present invention.

[0037] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the battery charging cut-off voltage testing method described in any item of the embodiment of the present invention when executed.

[0038] The technical solution provided by the embodiments of the present invention uses the charging capacity relationship to infer the charging capacity for a charging stage with a charge state K times the upper limit value based on the charging capacity during the charging stage with the charge state at the upper limit value. The battery is then charged in stages to the n-1th charging stage with a charge state at K times the upper limit value. The nth charging stage is then charged and the maximum cell voltage during this stage is measured, thereby obtaining the cutoff voltage of the battery when the charge state is K times the upper limit value. This allows for flexible determination of the cutoff voltage corresponding to different upper limit values ​​according to the charging stage with the charge state at the upper limit value, reducing the complexity of the test process and improving test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flowchart of a method for testing a battery charging cut-off voltage is provided in accordance with an embodiment of the present invention;

[0040] Figure 2A flowchart of another method for testing the battery charging cut-off voltage is provided for an embodiment of the present invention;

[0041] Figure 3 Schematic diagram of the relationship between SOC and cut-off voltage;

[0042] Figure 4 A schematic structural diagram of a battery charging cut-off voltage testing device is provided in accordance with an embodiment of the present invention;

[0043] Figure 5 A schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] Figure 1 A flowchart of a method for testing a battery's charge cutoff voltage is provided in accordance with an embodiment of the present invention. This embodiment is applicable to battery charge cutoff voltage testing. The method can be performed by a battery charge cutoff voltage testing device, which can be implemented using hardware and / or software. The method specifically includes the following steps:

[0046] S110, dividing the charging process into n charging stages according to the charging capacity of the battery; wherein n is greater than 1 and is a positive integer;

[0047] Specifically, the charging capacity of a battery refers to the charging current multiples that the battery cell can withstand. For example, the battery can be charged at charging current multiples of 1C, 0.5C, 0.3C and 0.1C, and the battery can be divided into four charging stages.

[0048] S120, obtaining the charging capacity of each charging stage where the state of charge is an upper limit value;

[0049] Specifically, the state of charge being the upper limit value refers to a state where the state of charge (SOC) of the battery is 100%. For example, when the SOC is 100%, the charging capacity of each charging stage can be allocated according to the staged charging method in the prior art.

[0050] S130. Obtain the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage when the state of charge is K times the upper limit value based on the charging capacity and the charging capacity relationship of each charging stage when the state of charge is the upper limit value; wherein K is greater than 0 and less than 1; and the charging capacity relationship is:

[0051] (c n-1 +c n )-(c' n-1 +c' n )=(1-K)c;c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage; c n-1 c is the charging capacity of the n-1th charging stage when the state of charge is the upper limit value; n is the charging capacity of the nth charging stage when the state of charge is the upper limit; c is the total charging capacity when the state of charge is the upper limit; where c' n-1 ≤c n-1 and c' n ≤c n ;

[0052] Specifically, the state of charge being K times the upper limit value refers to a state where the SOC is K, where the value of K is between 0 and 1, such as 90%, 95%, 97%, etc. The sum of the charging capacity of each stage at 100% SOC is the total charging capacity of the battery. Therefore, the step charging method with an SOC of 100% is:

[0053] c=c1+c2+c3+...+c n-1 +c n ;

[0054] c1, c2, c3…c n-1 、c n is the charging capacity corresponding to n charging stages;

[0055] The step charging method with SOC K is:

[0056] c=c1+c2+c3+...+c' n-1 +c' n ;

[0057] c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage;

[0058] The charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage in which the state of charge is K times the upper limit value are set according to the charging capacity relationship.

[0059] For example, charging is divided into four stages. When the upper limit SOC of charging is 100%, the total charging capacity is measured as c=c0=58Ah, where c1=0.6c0, c2=0.2c0, c3=0.13c0, and c4=0.07c0, and c0 is the rated capacity of the battery. That is, the step charging method with SOC of 100% is:

[0060] c0=0.6c0+0.2c0+0.13c0+0.07c0.

[0061] When the upper limit of charging is K, K is 95%, then:

[0062] 0.95c0=0.6c0+0.2c0+c'3+c'4

[0063] According to the charging capacity relationship, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage in the charge state are set to K times the upper limit value, then; (0.13c0+0.07c0)-(c'3+c'4)=0.05c0; setting c3=c3'=0.13c0, it can be seen that c4'=0.02c0.

[0064] S140 , determining a charging cutoff voltage when the state of charge is K times the upper limit value according to the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage.

[0065] Specifically, the charging capacity of each stage is charged according to the determined charge state being K times the upper limit value, and the charging capacity of the nth charging stage is c' n , the maximum cell voltage Vmax' of the battery corresponding to this stage can be obtained. The maximum cell voltage Vmax' of the battery is less than the cut-off voltage Vmax when the state of charge is the upper limit value. The maximum cell voltage is the cut-off voltage when the SOC upper limit is K.

[0066] The technical solution provided by the embodiments of the present invention uses the charging capacity relationship to infer the charging capacity for a charging stage with a charge state K times the upper limit value based on the charging capacity during the charging stage with the charge state at the upper limit value. The battery is then charged in stages to the n-1th charging stage with a charge state at K times the upper limit value. The nth charging stage is then charged and the maximum cell voltage during this stage is measured, thereby obtaining the cutoff voltage of the battery when the charge state is K times the upper limit value. This allows for flexible determination of the cutoff voltage corresponding to different upper limit values ​​according to the charging stage with the charge state at the upper limit value, reducing the complexity of the test process and improving test efficiency.

[0067] Figure 2 A flow chart of another method for testing the battery charging cut-off voltage is provided for an embodiment of the present invention. Figure 2 , the method comprising:

[0068] S210, dividing the charging process into n charging stages according to the charging capacity of the battery; wherein n is greater than 1 and is a positive integer;

[0069] S220, obtaining the charging capacity of each charging stage where the state of charge is an upper limit value;

[0070] S230. Obtain the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage when the state of charge is K times the upper limit value based on the charging capacity and the charging capacity relationship of each charging stage when the state of charge is the upper limit value; wherein K is greater than 0 and less than 1; and the charging capacity relationship is:

[0071] (c n-1 +c n )-(c' n-1 +c' n )=(1-K)c;c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage; c n-1 c is the charging capacity of the n-1th charging stage when the state of charge is the upper limit value; n is the charging capacity of the nth charging stage when the state of charge is the upper limit; c is the total charging capacity when the state of charge is the upper limit; where c' n-1 ≤c n-1 and c' n ≤c n ;

[0072] Specifically, the state of charge being K times the upper limit value refers to a state where the SOC is K, where the value of K is between 0 and 1, such as 90%, 95%, 97%, etc. The sum of the charging capacity of each stage at 100% SOC is the total charging capacity of the battery. Therefore, the step charging method with an SOC of 100% is:

[0073] c=c1+c2+c3+...+c n-1 +c n ;

[0074] c1, c2, c3…c n-1 、c n is the charging capacity corresponding to n charging stages;

[0075] The step charging method with SOC K is:

[0076] Kc=c1+c2+c3+...+c' n-1 +c' n ;

[0077] c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage;

[0078] The charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage in which the state of charge is K times the upper limit value are set according to the charging capacity relationship.

[0079] For example, charging is divided into four stages. When the upper limit SOC of charging is 100%, the total charging capacity is measured as c=c0=58Ah, where c1=0.6c0, c2=0.2c0, c3=0.13c0, and c4=0.07c0, and c0 is the rated capacity of the battery. That is, the step charging method with SOC of 100% is:

[0080] c0=0.6c0+0.2c0+0.13c0+0.07c0.

[0081] When the upper limit of charging is K, K is 95%, then:

[0082] 0.95c0=0.6c0+0.2c0+c'3+c'4

[0083] According to the charging capacity relationship, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage in the charge state are set to K times the upper limit value, then; (0.13c0+0.07c0)-(c'3+c'4)=0.05c0; setting c3=c3'=0.13c0, it can be seen that c4'=0.02c0.

[0084] S240, charging the battery according to the charging capacity of the first n-2 charging stages when the state of charge is the upper limit value and the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, where n is greater than 2;

[0085] Specifically, charging is performed according to a step charging method with an SOC of K, wherein the charging capacity of the first n-2 charging stages adopts a charging method with the charge state as the upper limit value, and the charging capacity of the n-1th charging stage is the set charging capacity.

[0086] S250, the charging of the n-1th charging stage is completed, and the nth charging stage is entered. After the charging of the nth charging stage is completed, the maximum single cell voltage of the battery is measured; when the maximum single cell voltage is less than the cut-off voltage when the state of charge is the upper limit value, the maximum single cell voltage is determined to be the charging cut-off voltage when the state of charge is K times the upper limit value.

[0087] Specifically, the charging of the n-1th charging stage ends and enters the nth charging stage. The charging capacity of the nth charging stage is c' n, we can obtain the maximum cell voltage Vmax' corresponding to this stage. The maximum cell voltage Vmax' is less than the cutoff voltage Vmax at the upper limit of the state of charge. The maximum cell voltage is the cutoff voltage when the upper limit of the SOC is K times the upper limit. The cutoff voltage Vmax at the upper limit of the state of charge can be obtained as a known parameter based on the battery specifications.

[0088] Optionally, obtaining the charging capacity of each charging stage where the state of charge is an upper limit value includes:

[0089] Obtain the preset charging capacity and preset charging current multiples for the first n-1 charging stages;

[0090] Charging the first n-1 charging stages according to the preset charging capacity and the preset charging current multiple;

[0091] After the first n-1 charging stages are completed, the battery is charged in the nth charging stage, and the charging time is recorded when the charge state reaches the cut-off voltage of the upper limit value;

[0092] According to the relationship between the charging time and the preset time, the charging capacity and the charging current multiple of each charging stage with the charge state being the upper limit value are determined.

[0093] Specifically, the charging capacity is the product of the charging time, the charging current multiple, and the rated current. The total charging capacity when the state of charge is the upper limit is:

[0094] c=a1I0t1+a2I0t2+a3I0t3+...+a n-1 I0t n-1 +a n I0t n ; Among them a1, a2, a3…a n-1 、a n is the charging current multiple; I0 is the rated current; t1, t2, t3…t n-1 , t n For charging time.

[0095] The charging capacity and charging current multiple of the first n-1 charging stages are set to preset values, and the first n-1 charging stages are charged, entering the nth charging stage. A timer is started, and the battery voltage is measured during charging. When the charging voltage reaches the cutoff voltage, charging is considered complete, and the charging time of the nth charging stage is recorded. The preset time is a reasonable threshold for the charging time of the nth charging stage. If the charging time of the nth charging stage is less than or equal to the preset time, it indicates that the settings of the charging capacity and charging current multiple of the nth charging stage meet the charging requirements. The charging capacity and charging parameters of each charging stage are then determined based on the preset charging capacity and preset charging current multiple. If the charging time of the nth charging stage exceeds the preset time, it indicates that the charging duration of the nth charging stage is too long and does not meet the charging requirements. For example, the preset charging capacity and / or preset charging current multiple of the previous charging stage can be adjusted to reduce the charging duration of the nth charging stage, thereby determining the charging capacity and charging parameters of each charging stage.

[0096] Optionally, determining the charging capacity and charging current multiple when the state of charge is an upper limit value based on the relationship between the charging time and the preset time includes:

[0097] If the charging time exceeds the preset time, the preset charging capacity and / or the preset charging current multiple of at least one of the first n-1 charging stages are adjusted, and the charging time of the nth charging stage is obtained again until the charging time is less than or equal to the preset time, thereby determining the charging capacity and charging current multiple of each charging stage.

[0098] Specifically, if the charging time of the last stage obtained by the test is too long and cannot meet the charging time requirement, it means that the charging capacity of the last stage is too large and cannot be fully charged within the charging time. For example, the preset charging capacity of any one or more of the first n-1 charging stages can be adjusted. Since the total battery capacity of the battery remains unchanged, the charging capacity of the last stage can be reduced by increasing the charging capacity of the previous charging stage, or the preset charging capacity of any of the first n-1 charging stages can be increased, and the preset charging current multiples of each stage can be adjusted to reduce the charging capacity of the last stage. Optionally, to facilitate adjustment, if the charging time of the last stage obtained by the test is too long and cannot meet the charging time requirement, the preset charging capacity of the n-1th charging stage can be increased, and the charging time of the last stage can be retested. If the charging time of the last stage still cannot meet the charging time requirement, the preset charging capacity of the n-1th charging stage and the preset charging current multiples of each stage can be increased again, thereby determining the charging capacity and charging parameters of each charging stage based on the preset charging capacity and preset charging current multiples of each stage, as well as the adjusted preset charging capacity and preset charging current multiples.

[0099] Optionally, the charging capacity is the product of the charging time and the charging current; wherein the charging current is the product of the charging current multiple and the rated current; after determining the charging cutoff voltage when the state of charge is the upper limit value based on the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage, the method further includes:

[0100] The charging time of each charging stage in which the state of charge is K times the upper limit value is determined according to the charging capacity and the charging current.

[0101] Specifically, the charging capacity is the product of the charging time, the charging current multiple, and the rated current. Therefore, the step charging method with an SOC of 100% is:

[0102] c=c1+c2+c3+...+c n-1 +c n ; can be expressed as:

[0103] c=a1I0t1+a2I0t2+a3I0t3+...+a n-1 I0t n-1 +a n I0t n ;

[0104] Step charging method with SOC K:

[0105] Kc=c1+c2+c3+...+c' n-1 +c' n ; can be expressed as:

[0106] Kc=a1I0t1+a2I0t2+a3I0t3+...+a' n-1 I0t n-1 '+a' n I0t n ';

[0107] a' n-1 is the charging current multiple of the n-1th charging stage in which the state of charge is K times the upper limit value, a' n is the charging current multiple of the nth charging stage when the state of charge is K times the upper limit value; t n-1 ' is the charging time of the n-1th charging stage when the state of charge is K times the upper limit value, t n ' is the charging time of the nth charging stage when the state of charge is K times the upper limit value. Therefore, the charging time of each stage can be expressed as: and The rated charging current can be known based on the battery performance. Based on the rated charging current combined with the relationship between the charging current multiple and the charging time and charging capacity, the charging time for each charging stage can be quickly determined.

[0108] Exemplarily, an embodiment of the present invention provides a method for quickly obtaining time for step charging. Assume that the charging process of the battery is divided into four stages according to the performance of the battery, wherein the rated current I0 of the battery is 58A, and when the upper limit SOC is 100%, the total charging capacity c=c0=58Ah is measured, c0 is the rated capacity of the battery, and the charging cut-off voltage is 4.25V; when the charging upper limit is K, K is 95%, and the charging cut-off voltage is measured to be 4.17V, wherein a1=1, a2=0.5, a3=a'3=0.3, a4=a'4=0.1, c1=0.6c0, c2=0.2c0, c3=c3'=0.13c0, c4=0.07c0, c4'=0.02c0, ​​then:

[0109] c0=a1I0t1+a2I0t2+a3I0t3+a4I0t4;

[0110] 0.95c0=a1I0t1+a2I0t2+a'3I0t3'+a'4I0t4';

[0111] That is: 1 = 1.0t1 + 0.5t2 + 0.3t3 + 0.1t4;

[0112] 0.95=1.0t1+0.5t2+0.3t3'+0.1t4';

[0113] 1.0t1=0.6;

[0114] 0.5t2=0.2;

[0115] 0.3t3=0.3t3′=0.13;

[0116] 0.1t4=0.07;

[0117] 0.1t4'=0.02;

[0118] Calculation yields: t1 = 0.6 h, t2 = 0.4 h, t3 = t3' = 0.43 h, t4 = 0.7 h, t4' = 0.2 h.

[0119] Figure 3 This is a diagram showing the relationship between SOC and cut-off voltage, see Figure 3 When the upper limit SOC is 100%, the charging enters the fourth stage of charging, and after charging for 0.7h, the maximum voltage reaches 4.25V, and the charging is completed; when the upper limit SOC is 95%, the charging enters the fourth stage of charging, and after charging for 0.2h, the maximum voltage reaches 4.17V, and the charging is completed.

[0120] Optionally, the product of the charging current multiple and the rated current is less than or equal to the maximum allowable charging current of the battery. Specifically, the charging current in each stage needs to be less than or equal to the maximum allowable charging current of the battery to ensure charging safety.

[0121] Optionally, the charging capacity in each charging stage is less than the rated capacity of the battery. Specifically, the rated capacity of the battery can be obtained based on the type and performance of the battery, which is a known value. The charging capacity in each stage needs to be less than the rated capacity to further improve charging safety.

[0122] Figure 4 The present invention provides a schematic diagram of a battery charging cut-off voltage test device. Figure 4 ,include:

[0123] The division module 110 is configured to divide the charging process into n charging stages according to the charging capacity of the battery; wherein n is greater than 1 and is a positive integer;

[0124] An acquisition module 120 is configured to acquire the charging capacity of each charging stage when the state of charge is an upper limit value;

[0125] A module 130 is provided for obtaining, based on the charging capacity and the charging capacity relationship of each charging stage with the state of charge being the upper limit value, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage with the state of charge being K times the upper limit value; wherein K is greater than 0 and less than 1; and the charging capacity relationship is:

[0126] (c n-1 +c n )-(c' n-1 +c' n )=(1-K)c;c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage; c n-1 c is the charging capacity of the n-1th charging stage when the state of charge is the upper limit value; n is the charging capacity of the nth charging stage when the state of charge is the upper limit; c is the total charging capacity when the state of charge is the upper limit; where c' n-1 ≤c n-1 and c' n ≤c n ;

[0127] The determination module 140 is configured to determine a charging cutoff voltage when the state of charge is K times the upper limit value based on the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage.

[0128] Specifically, a battery's charging capacity refers to the charging current multiples that a battery cell can withstand. For example, a battery can be charged at charging current multiples of 1C, 0.5C, 0.3C, and 0.1C. The division module 110 can then divide the battery into four charging stages. The upper limit of the state of charge (SOC) refers to a state of charge (SOC) of 100%. For example, when the SOC is 100%, the acquisition module 120 can obtain the charging capacity of each charging stage based on the staged charging method known in the art.

[0129] The state of charge is K times the upper limit value refers to the state of SOC K, where K is between 0 and 1, such as 90%, 95%, 97%, etc. The sum of the charging capacity of each stage at 100% SOC is the total charging capacity of the battery. Therefore, the step charging method with SOC of 100% is:

[0130] c=c1+c2+c3+...+c n-1 +c n ;

[0131] c1, c2, c3…c n-1 、c n is the charging capacity corresponding to n charging stages;

[0132] The step charging method with SOC K is:

[0133] c=c1+c2+c3+...+c' n-1 +c' n ;

[0134] c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n is the charging capacity of the nth charging stage;

[0135] The setting module 130 sets the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage in which the state of charge is K times the upper limit value according to the charging capacity relationship.

[0136] For example, charging is divided into four stages. When the upper limit SOC of charging is 100%, the total charging capacity is measured as c=c0=58Ah, where c1=0.6c0, c2=0.2c0, c3=0.13c0, and c4=0.07c0, and c0 is the rated capacity of the battery. That is, the step charging method with SOC of 100% is:

[0137] c0=0.6c0+0.2c0+0.13c0+0.07c0.

[0138] When the upper limit of charging is K, K is 95%, then:

[0139] 0.95c0=0.6c0+0.2c0+c'3+c'4

[0140] According to the charging capacity relationship, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage in the charge state are set to K times the upper limit value, then; (0.13c0+0.07c0)-(c'3+c'4)=0.05c0; setting c3=c3'=0.13c0, it can be seen that c4'=0.02c0.

[0141] The determining module 140 charges the battery according to the charging capacity of each stage when the determined state of charge is K times the upper limit value. The charging capacity of the nth charging stage is c' n , the maximum cell voltage Vmax' of the battery corresponding to this stage can be obtained. The maximum cell voltage Vmax' of the battery is less than the cut-off voltage Vmax when the state of charge is the upper limit value. The maximum cell voltage is the cut-off voltage when the SOC upper limit is K.

[0142] Optionally, determine the modules, including:

[0143] a charging unit, configured to charge the battery according to the charging capacity of the first n-2 charging stages when the state of charge is the upper limit value and the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value;

[0144] The determination unit is used to measure the maximum cell voltage of the battery after the charging of the n-1th charging stage is completed and the nth charging stage is entered; when the maximum cell voltage is less than the cut-off voltage when the state of charge is the upper limit value, the maximum cell voltage is determined to be the charging cut-off voltage when the state of charge is K times the upper limit value.

[0145] Specifically, the charging unit is charged according to a step charging method with an SOC of K, wherein the charging capacity of the first n-2 charging stages adopts a charging method with the charge state as the upper limit value, and the charging capacity of the n-1th charging stage is the set charging capacity.

[0146] The charging of the n-1th charging stage is completed and the nth charging stage begins. The charging capacity of the nth charging stage is c' n The determination unit can obtain the maximum cell voltage Vmax' of the battery corresponding to this stage. The maximum cell voltage Vmax' of the battery is less than the cutoff voltage Vmax at the upper limit of the state of charge. The maximum cell voltage is the cutoff voltage at the upper limit of the SOC K. The cutoff voltage Vmax at the upper limit of the state of charge can be obtained based on the battery specifications and can be used as a known parameter.

[0147] An embodiment of the present invention further provides an electronic device, the electronic device comprising:

[0148] at least one processor; and

[0149] a memory communicatively connected to at least one processor; wherein,

[0150] The memory stores a computer program that can be executed by at least one processor. The computer program is executed by the at least one processor so that the at least one processor can execute any battery charging cut-off voltage testing method of the embodiments of the present invention.

[0151] Figure 5 A schematic diagram of the structure of an electronic device provided for an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0152] like Figure 5 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device 10 can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0153] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0154] The processor 11 may be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above.

[0155] In some embodiments, the battery charge cut-off voltage test method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the battery charge cut-off voltage test method described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the battery charge cut-off voltage test method in any other appropriate manner (for example, by means of firmware).

[0156] Various embodiments of the systems and techniques described above can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0157] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0158] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0159] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0160] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0161] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery charging cut-off voltage testing method, characterized in that: include: The charging process is divided into n charging stages according to the charging capacity of the battery; wherein n is greater than 2 and is a positive integer; Obtaining the charging capacity of each charging stage when the state of charge is an upper limit value; According to the charging capacity and charging capacity relationship of each charging stage with the charge state being the upper limit value, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage with the charge state being K times the upper limit value are obtained; wherein K is greater than 0 and less than 1; the charging capacity relationship is: (c n-1 +c n )-(c' n-1 +c' n )=(1-K)c;c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n c is the charging capacity of the nth charging stage when the state of charge is K times the upper limit value; n-1 c is the charging capacity of the n-1th charging stage when the state of charge is the upper limit value; n is the charging capacity of the nth charging stage when the state of charge is the upper limit; c is the total charging capacity when the state of charge is the upper limit; where c' n-1 ≤c n-1 and c' n ≤c n ; Determining a charging cutoff voltage when the state of charge is K times the upper limit value based on the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage; Wherein, determining the charging cutoff voltage when the charge state is K times the upper limit value according to the cutoff voltage when the charge state is the upper limit value, the charging capacity of the n-1th charging stage when the charge state is K times the upper limit value, and the charging capacity of the nth charging stage includes: charging the battery according to the charging capacity of the first n-2 charging stages when the state of charge is the upper limit value and the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value; After the charging of the n-1th charging stage is completed, the nth charging stage is entered, and after the charging of the nth charging stage is completed, the maximum single cell voltage of the battery is measured; When the maximum cell voltage is less than the cut-off voltage when the state of charge is an upper limit value, the maximum cell voltage is determined to be the charging cut-off voltage when the state of charge is K times the upper limit value.

2. The battery charging cut-off voltage testing method according to claim 1, characterized in that: Obtain the charging capacity of each charging stage with the state of charge as the upper limit value, including: Obtaining the preset charging capacity and the preset charging current multiple for the first n-1 charging stages; Charging the first n-1 charging stages according to the preset charging capacity and the preset charging current multiple; After the first n-1 charging stages are completed, the battery is charged in the nth charging stage, and the charging time is recorded when the battery is charged to the cut-off voltage at the upper limit value of the charge state; According to the relationship between the charging time and the preset time, the charging capacity and the charging current multiple of each charging stage in which the charge state is an upper limit value are determined.

3. The battery charging cut-off voltage testing method according to claim 2, characterized in that: Determining, based on the relationship between the charging time and the preset time, the charging capacity and the charging current multiple of each charging stage in which the state of charge is an upper limit value, includes: If the charging time exceeds the preset time, the preset charging capacity and / or the preset charging current multiple of at least one of the first n-1 charging stages are adjusted, and the charging time of the nth charging stage is obtained again until the charging time is less than or equal to the preset time, thereby determining the charging capacity and the charging current multiple of each charging stage.

4. The battery charging cut-off voltage testing method according to claim 2, characterized in that: The charging capacity is the product of the charging time and the charging current; wherein the charging current is the product of the charging current multiple and the rated current; After determining the charging cutoff voltage when the state of charge is K times the upper limit value based on the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage, the method further includes: The charging time of each charging stage in which the state of charge is K times the upper limit value is determined according to the charging capacity and the charging current.

5. The battery charging cut-off voltage testing method according to claim 4, characterized in that: The product of the charging current multiple and the rated current is less than or equal to the maximum charging current allowed by the battery.

6. The battery charging cut-off voltage testing method according to claim 5, characterized in that: The charging capacity in each charging stage is smaller than the rated capacity of the battery.

7. A battery charging cut-off voltage test device, characterized in that: include: A division module, configured to divide the charging process into n charging stages according to the charging capacity of the battery; wherein n is greater than 2 and is a positive integer; an acquisition module, configured to acquire the charging capacity of each charging stage when the state of charge is an upper limit value; A setting module is configured to obtain, based on the charging capacity and the charging capacity relationship of each charging stage where the state of charge is the upper limit value, the charging capacity of the n-1th charging stage and the charging capacity of the nth charging stage where the state of charge is K times the upper limit value; wherein K is greater than 0 and less than 1; and the charging capacity relationship is: (c n-1 +c n )-(c' n-1 +c' n )=(1-K)c;c' n-1 c' is the charge capacity at the n-1th charging stage when the state of charge is K times the upper limit value, n c is the charging capacity of the nth charging stage when the state of charge is K times the upper limit value; n-1 c is the charging capacity of the n-1th charging stage when the state of charge is the upper limit value; n is the charging capacity of the nth charging stage when the state of charge is the upper limit; c is the total charging capacity when the state of charge is the upper limit; where c' n-1 ≤c n-1 and c' n ≤c n ; a determination module, configured to determine a charging cutoff voltage when the state of charge is K times the upper limit value based on the cutoff voltage when the state of charge is the upper limit value, the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value, and the charging capacity of the nth charging stage; Identify modules, including: a charging unit, configured to charge the battery according to the charging capacity of the first n-2 charging stages when the state of charge is the upper limit value and the charging capacity of the n-1th charging stage when the state of charge is K times the upper limit value; The determination unit is used to measure the maximum cell voltage of the battery after the charging of the n-1th charging stage is completed and the nth charging stage is entered; when the maximum cell voltage is less than the cut-off voltage when the state of charge is the upper limit value, the maximum cell voltage is determined to be the charging cut-off voltage when the state of charge is K times the upper limit value.

8. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the battery charging cut-off voltage testing method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the battery charging cut-off voltage testing method according to any one of claims 1 to 6 when executed.

Images