CN116087807A - Method and device for testing battery charging cut-off voltage, electronic equipment and storage medium - Google Patents
Method and device for testing battery charging cut-off voltage, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a battery charging cut-off voltage testing method, a device, electronic equipment and a storage medium. The method comprises the following steps: dividing a charging process into n charging stages according to the charging capability of the battery; acquiring a charging capacity of each charging stage with a charge state being an upper limit value; obtaining the charging capacity of the n-1 charging stage and the charging capacity of the n charging stage in the upper limit value of the charge state according to the relationship between the charging capacity and the charging capacity of each charging stage in the upper limit value of the charge state; wherein K is greater than 0 and less than 1; and determining the charge cutoff voltage with the charge state being the K times of the upper limit value according to the cutoff voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the charge state being the K times of the upper limit value. The technical scheme provided by the invention reduces the complexity of the test process and improves the test efficiency.
Description
Technical Field
The embodiment of the invention relates to the technical field of battery charging, in particular to a battery charging cut-off voltage testing method, a device, electronic equipment and a storage medium.
Background
The power of the electric automobile mainly comes from a battery system, the electric quantity of the battery system directly influences the endurance mileage of the whole automobile, in order to meet the requirement of the endurance mileage of the whole automobile, the battery system needs to be charged with enough electric quantity, and meanwhile, the safety and the service life of the battery are both considered,
at present, the cut-off voltage measurement method of the battery mainly comprises differential amplifier isolation detection, voltage part voltage isolation detection, photoelectric relay isolation detection and the like, but the test process is tedious and reduces the measurement efficiency.
Disclosure of Invention
The invention provides a battery charging cut-off voltage testing method, a device, electronic equipment and a storage medium, which reduce the complexity of a testing process and improve the testing efficiency.
In a first aspect, an embodiment of the present invention provides a method for testing a battery charging cutoff voltage, including:
dividing a charging process into n charging stages according to the charging capability of the battery; wherein n is greater than 1 and is a positive integer;
acquiring a charging capacity of each charging stage with a charge state being an upper limit value;
obtaining the charging capacity of the n-1 charging stage and the charging capacity of the n charging stage in the upper limit value of the charge state according to the relationship between the charging capacity and the charging capacity of each charging stage in which the charge state is the upper limit value; 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 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase; c n-1 A charge capacity at an n-1-th charging stage in which the charge state is an upper limit value; c n A charge capacity at an nth charge stage having a charge state of an upper limit value; c is the total charge capacity with the charge state being the upper limit value; wherein c' n-1 ≤c n-1 And c' n ≤c n ；
And determining the charge cutoff voltage with the charge state being the K times of the upper limit value according to the cutoff voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the charge state being the K times of the upper limit value.
Optionally, determining the charge cutoff voltage with the charge state being K times the upper limit value according to the cutoff voltage with the charge state being the upper limit value, the charge capacity of the n-1 th charging stage and the charge capacity of the n-th charging stage in the charge state being K times the upper limit value includes:
charging the battery according to the charging capacity of the first n-2 charging stages with the charge state being the upper limit value and the charging capacity of the nth-1 charging stage with the charge state being K times the upper limit value, wherein n is more than 2;
the charging of the n-1 charging stage is finished, the charging enters the n charging stage, and the maximum monomer voltage of the battery is measured after the charging of the n charging stage is finished;
and when the maximum monomer voltage is smaller than the cut-off voltage with the charge state being the upper limit value, determining the maximum monomer voltage as the charge cut-off voltage with the charge state being K times the upper limit value.
Optionally, acquiring the charge capacity of each charging stage with the charge state being the upper limit value includes:
acquiring preset charging capacity and preset charging current multiples of the previous 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 charging is completed in the first n-1 charging stages, 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 with the charge state being the upper limit value;
and determining the charging capacity and the charging current multiple of each charging stage of which the charge state is the upper limit value according to the relationship between the charging time and the preset time.
Optionally, determining the charging capacity and the multiple of the charging current of each charging stage in which the state of charge is the upper limit value according to the relationship between the charging time and the preset time includes:
and if the charging time exceeds the preset time, adjusting the preset charging capacity and/or the preset charging current multiple of at least one of the previous n-1 charging stages, and acquiring the charging time of the nth charging stage again until the charging time is smaller than or equal to the preset time, so as to determine the charging capacity and the charging current multiple of each charging stage.
Optionally, the charging capacity is a product of charging time and charging current; wherein the charging current is the product of the multiple of the charging current and the rated current;
after determining the charge cutoff voltage with the charge state being the K-times upper limit value according to the cutoff voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage with the charge state being the K-times upper limit value and the charge capacity of the n charge stage, the method further comprises:
and determining the charging time of each charging stage of which the charge state is K times of the upper limit value according to the charging capacity and the charging current.
Optionally, the product of the multiple of the charging current and the rated current is less than or equal to the maximum charging current allowed by the battery.
Optionally, the charging capacity of each charging stage is smaller than the rated capacity of the battery.
In a second aspect, an embodiment of the present invention provides a battery charge cutoff voltage testing apparatus, including:
the division module is used for 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;
the acquisition module is used for acquiring the charging capacity of each charging stage with the charge state being the upper limit value;
the setting module is used for obtaining the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the upper limit value of the charge state which is K times according to the relationship between the charge capacity and the charge capacity of each charge stage of which the charge state is the upper limit value; 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 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase; c n-1 A charge capacity at an n-1-th charging stage in which the charge state is an upper limit value; c n A charge capacity at an nth charge stage having a charge state of an upper limit value; c is the total charge capacity with the charge state being the upper limit value; wherein c' n-1 ≤c n-1 And c' n ≤c n ；
And the determining module is used for determining the charge cut-off voltage with the charge state being the K times of the upper limit value according to the cut-off voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the charge state being the K times of the upper limit value.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the battery charge cutoff voltage testing method of any of the embodiments of the present invention.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing a processor to implement the battery charge cutoff voltage testing method according to any of the embodiments of the present invention when executed.
According to the technical scheme provided by the embodiment of the invention, according to the charging capacity of the charging stage with the charge state being the upper limit value, the charging capacity of the charging stage with the charge state being the K-time upper limit value is calculated by utilizing the charging capacity relation, the battery is charged to the n-1 charging stage with the charge state being the K-time upper limit value in stages, then the n-th charging stage is charged, and the maximum monomer voltage in the stage is measured, so that the cut-off voltage of the battery when the charge state is the K-time upper limit value can be obtained. Therefore, according to the charging stage with the charge state being the upper limit value, the cut-off voltages corresponding to different upper limit values can be flexibly obtained, the complexity of the testing process is reduced, and the testing efficiency is improved.
Drawings
Fig. 1 is a schematic flow chart of a method for testing a battery charging cut-off voltage according to an embodiment of the invention;
FIG. 2 is a flowchart of another method for testing a battery charge cutoff voltage according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of SOC versus cut-off voltage;
fig. 4 is a schematic structural diagram of a battery charge cut-off voltage testing device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic flow chart of a method for testing a battery charging cut-off voltage according to an embodiment of the present invention, where the method can be implemented by a device for testing a battery charging cut-off voltage, and the device can be implemented in hardware and/or software. The method specifically comprises the following steps:
s110, dividing a charging process into n charging stages according to the charging capacity of a battery; wherein n is greater than 1 and is a positive integer;
specifically, the charging capability of the battery refers to the charging current multiple that the battery cell can withstand, and by way of example, the battery can be charged at charging current multiples of 1C, 0.5C, 0.3C and 0.1C, and then the battery can be divided into 4 charging phases.
S120, acquiring the charge capacity of each charging stage with the charge state being the upper limit value;
specifically, the State Of Charge is an upper limit value, which means a State Of Charge (SOC) Of the battery Of 100%; for example, in the state where the SOC is 100%, the charge capacity of each charge stage may be allocated according to a staged charge method in the related art.
S130, obtaining the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the upper limit value of the charge state K times according to the relationship between the charge capacity and the charge capacity of each charge stage in the upper limit value of the charge state; wherein K is greater than 0 and less than 1; the charge capacity relationship is:
(c n-1 +c n )-(c' n-1 +c' n )＝(1-K)c；c' n-1 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase; c n-1 A charge capacity at an n-1-th charging stage in which the charge state is an upper limit value; c n A charge capacity at an nth charge stage having a charge state of an upper limit value; c is the total charge capacity with the charge state being the upper limit value; wherein c' n-1 ≤c n-1 And c' n ≤c n ；
Specifically, the state of charge K times the upper limit value refers to a state in which the SOC is K, where K has a value between 0 and 1, for example, 90%,95%,97%, or the like. The sum of the charge capacities at each stage in the 100% SOC state is the total charge capacity of the battery, and therefore, the step charge mode in which the SOC is 100% is:
c＝c 1 +c 2 +c 3 +...+c n-1 +c n ；
c 1 、c 2 、c 3 …c n-1 、c n the charging capacity corresponding to n charging stages;
the step charging mode with SOC of K is as follows:
c＝c 1 +c 2 +c 3 +...+c' n-1 +c' n ；
c' n-1 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase;
the charge state is set to the charge capacity of the n-1 th charge stage and the charge capacity of the n-th charge stage in the K-times upper limit value according to the charge capacity relationship.
For example, the charging is divided into 4 stages, and the total charge capacity c=c is measured when the upper charge limit SOC is 100% 0 =58 Ah, where c 1 ＝0.6c 0 ，c 2 ＝0.2c 0 ，c 3 ＝0.13c 0 、c 4 ＝0.07c 0 ，c 0 The step charge mode for the rated capacity of the battery, that is, the SOC of 100%, is:
c 0 ＝0.6c 0 +0.2c 0 +0.13c 0 +0.07c 0 。
when the upper limit of charging is K, K is 95%, and the following are:
0.95c 0 ＝0.6c 0 +0.2c 0 +c' 3 +c' 4
setting the charge state as the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the K times upper limit value according to the charge capacity relation; (0.13 c) 0 +0.07c 0 )-(c' 3 +c' 4 )＝0.05c 0 The method comprises the steps of carrying out a first treatment on the surface of the Setting c 3 ＝c 3 ’＝0.13c 0 Then it can be seen that c 4 ’＝0.02c 0 。
S140, determining the charge cutoff voltage with the charge state being the upper limit value according to the cutoff voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage with the charge state being the upper limit value of K times and the charge capacity of the n charge stage.
Specifically, the charging is performed according to the charging capacity of each stage in which the determined charge state is K times the upper limit value, and the charging capacity of the nth charging stage is c' n The battery corresponding to the stage can be obtainedThe maximum cell voltage Vmax', which is the cut-off voltage with the upper limit of the SOC K, is smaller than the cut-off voltage Vmax with the upper limit of the charge state.
According to the technical scheme provided by the embodiment of the invention, according to the charging capacity of the charging stage with the charge state being the upper limit value, the charging capacity of the charging stage with the charge state being the K-time upper limit value is calculated by utilizing the charging capacity relation, the battery is charged to the n-1 charging stage with the charge state being the K-time upper limit value in stages, then the n-th charging stage is charged, and the maximum monomer voltage in the stage is measured, so that the cut-off voltage of the battery when the charge state is the K-time upper limit value can be obtained. Therefore, according to the charging stage with the charge state being the upper limit value, the cut-off voltages corresponding to different upper limit values can be flexibly obtained, the complexity of the testing process is reduced, and the testing efficiency is improved.
Fig. 2 is a flowchart of another method for testing a battery charge cut-off voltage according to an embodiment of the present invention, referring to fig. 2, the method includes:
s210, dividing a charging process into n charging stages according to the charging capacity of a battery; wherein n is greater than 1 and is a positive integer;
s220, acquiring the charging capacity of each charging stage with the charge state being the upper limit value;
s230, obtaining the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the upper limit value of the charge state K times according to the relationship between the charge capacity and the charge capacity of each charge stage in the upper limit value of the charge state; wherein K is greater than 0 and less than 1; the charge capacity relationship is:
(c n-1 +c n )-(c' n-1 +c' n )＝(1-K)c；c' n-1 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase; c n-1 A charge capacity at an n-1-th charging stage in which the charge state is an upper limit value; c n A charge capacity at an nth charge stage having a charge state of an upper limit value; c is the total charge capacity with the charge state being the upper limit value; wherein c' n-1 ≤c n-1 And c' n ≤c n ；
Specifically, the state of charge K times the upper limit value refers to a state in which the SOC is K, where K has a value between 0 and 1, for example, 90%,95%,97%, or the like. The sum of the charge capacities at each stage in the 100% SOC state is the total charge capacity of the battery, and therefore, the step charge mode in which the SOC is 100% is:
c＝c 1 +c 2 +c 3 +...+c n-1 +c n ；
c 1 、c 2 、c 3 …c n-1 、c n the charging capacity corresponding to n charging stages;
the step charging mode with SOC of K is as follows:
Kc＝c 1 +c 2 +c 3 +...+c' n-1 +c' n ；
c' n-1 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase;
the charge state is set to the charge capacity of the n-1 th charge stage and the charge capacity of the n-th charge stage in the K-times upper limit value according to the charge capacity relationship.
For example, the charging is divided into 4 stages, and the total charge capacity c=c is measured when the upper charge limit SOC is 100% 0 =58 Ah, where c 1 ＝0.6c 0 ，c 2 ＝0.2c 0 ，c 3 ＝0.13c 0 、c 4 ＝0.07c 0 ，c 0 The step charge mode for the rated capacity of the battery, that is, the SOC of 100%, is:
c 0 ＝0.6c 0 +0.2c 0 +0.13c 0 +0.07c 0 。
when the upper limit of charging is K, K is 95%, and the following are:
0.95c 0 ＝0.6c 0 +0.2c 0 +c' 3 +c' 4
setting the charge state as the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the K times upper limit value according to the charge capacity relation; (0.13 c) 0 +0.07c 0 )-(c' 3 +c' 4 )＝0.05c 0 The method comprises the steps of carrying out a first treatment on the surface of the Setting c 3 ＝c 3 ’＝0.13c 0 Then it can be seen that c 4 ’＝0.02c 0 。
S240, charging the battery according to the charging capacity of the first n-2 charging stages with the charge state being the upper limit value and the charging capacity of the nth-1 charging stage with the charge state being K times the upper limit value, wherein n is more than 2;
specifically, the charging is performed according to a step charging mode in which the SOC is K, wherein the charging capacities of the first n-2 charging stages are charging modes in which the state of charge is an upper limit value, and the charging capacity of the n-1 charging stage is a set charging capacity.
S250, after the charging in the n-1 charging stage is finished, entering an n charging stage, and measuring the maximum monomer voltage of the battery after the charging in the n charging stage is finished; when the maximum cell voltage is smaller than the cutoff voltage whose charge state is the upper limit value, the maximum cell voltage is determined as the charge cutoff voltage whose charge state is K times the upper limit value.
Specifically, the charging in the n-1 charging stage is completed, the charging enters the n charging stage, and the charging capacity in the n charging stage is c' n The battery maximum cell voltage Vmax 'corresponding to this stage can be obtained, and the battery maximum cell voltage Vmax' is smaller than the cutoff voltage Vmax whose state of charge is the upper limit value, and the maximum cell voltage is the cutoff voltage whose SOC upper limit is K times the upper limit value. The cutoff voltage Vmax whose state of charge is the upper limit value can be obtained as a known parameter according to the specification of the battery.
Optionally, acquiring the charge capacity of each charging stage with the charge state being the upper limit value includes:
acquiring preset charging capacity and preset charging current multiples of the first n-1 charging stages;
charging the first n-1 charging stages according to a preset charging capacity and the preset charging current multiple;
after the charging is completed in the first n-1 charging stages, 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 with the charge state being the upper limit value;
and determining the charging capacity and the charging current multiple of each charging stage with the charge state being the upper limit value according to the relationship between the charging time and the preset time.
Specifically, the charging capacity is the product of the charging time, the multiple of the charging current and the rated current, and the total charging capacity with the charge state being the upper limit value is:
c＝a 1 I 0 t 1 +a 2 I 0 t 2 +a 3 I 0 t 3 +...+a n-1 I 0 t n-1 +a n I 0 t n the method comprises the steps of carrying out a first treatment on the surface of the Wherein a is 1 、a 2 、a 3 …a n-1 、a n Is a multiple of the charging current; i 0 Is rated current; t is t 1 、t 2 、t 3 …t n-1 、t n Is the charging time.
The charging capacity and the charging current multiple of the first n-1 charging stages are respectively set to preset values, the first n-1 charging stages are charged, the charging process of the nth stage is started, timing is started, the voltage of the battery is measured in the charging process, when the charging voltage reaches the cut-off voltage, the charging is considered to be completed, and the charging time of the nth charging stage is recorded. The preset time is a reasonable threshold value of the charging time of the nth charging stage, and if the charging time of the nth charging stage is smaller than or equal to the preset time, the setting of the charging capacity and the charging current multiple of the nth charging stage is indicated to meet the charging requirement, so that the charging capacity and the charging parameters of each stage are determined according to the preset charging capacity and the preset charging current multiple. If the charging time of the nth charging stage exceeds the preset time, it indicates that the charging time of the nth charging stage is too long and does not meet the charging requirement, and the preset charging capacity and/or the preset charging current multiple of the previous charging stage can be adjusted, so that the charging time of the nth charging stage is reduced, and the charging capacity and the charging parameters of each charging stage are determined.
Optionally, determining the charging capacity and the multiple of the charging current with the charge state being the upper limit value according to the relationship between the charging time and the preset time includes:
if the charging time exceeds the preset time, the preset charging capacity and/or the preset charging current multiple of at least one charging stage in the previous n-1 charging stages are adjusted, and the charging time of the nth charging stage is acquired again until the charging time is smaller than or equal to the preset time, so that the charging capacity and the charging current multiple of each charging stage are determined.
Specifically, if the charging time of the last stage obtained by the test is too long, the requirement of the charging time cannot be met, which means that the charging capacity of the last stage is larger, and cannot be fully charged in the charging time, and by way of example, the preset charging capacity of any one or more of the previous n-1 charging stages can be adjusted, and since the total battery capacity of the battery is unchanged, the charging capacity of the previous charging stage can be increased, so that the charging capacity of the last stage is reduced, or the preset charging capacity of the previous n-1 arbitrary charging stages is increased, and the preset charging current multiple of each stage is adjusted, so that the charging capacity of the last stage is reduced. Optionally, in order to facilitate adjustment, if the charging time of the last stage obtained by the test is too long, the preset charging capacity of the n-1 charging stage may be increased, the charging time of the last stage is retested, if the charging time of the last stage is still not satisfactory, the preset charging capacity of the n-1 charging stage and the preset charging current multiple of each stage may be increased again, so that the charging capacity and the charging parameters of each charging stage are determined according to the preset charging capacity and the preset charging current multiple of each stage, and the preset charging capacity and the preset charging current multiple after adjustment.
Optionally, the charging capacity is a product of the charging time and the charging current; wherein, the charging current is the product of the multiple of the charging current and the rated current; after determining the charge cutoff voltage having the charge state of K times the upper limit value based on the cutoff voltage having the charge state of K times the upper limit value, the charge capacity of the n-1 th charging stage and the charge capacity of the n-th 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 from the charging capacity and the charging current.
Specifically, the charging capacity is the product of the charging time, the multiple of the charging current and the rated current, and therefore, the SOC is 100% of the step charging mode:
c＝c 1 +c 2 +c 3 +...+c n-1 +c n the method comprises the steps of carrying out a first treatment on the surface of the Can be expressed as:
c＝a 1 I 0 t 1 +a 2 I 0 t 2 +a 3 I 0 t 3 +...+a n-1 I 0 t n-1 +a n I 0 t n ；
step charging mode with SOC K:
Kc＝c 1 +c 2 +c 3 +...+c' n-1 +c' n the method comprises the steps of carrying out a first treatment on the surface of the Can be expressed as:
Kc＝a 1 I 0 t 1 +a 2 I 0 t 2 +a 3 I 0 t 3 +...+a' n-1 I 0 t n-1 '+a' n I 0 t n '；
a' n-1 a 'is a charging current multiple of the n-1 th charging stage in the upper limit value of the charge state of K times' n The charge state is the charging current multiple of the nth charging stage in the K times upper limit value; t is t n-1 ' is the charge time of the n-1 th charge stage in the upper limit value of the charge state of K times, t n ' is the charge time of the nth charge stage in the K-times upper limit value of the charge state. The charge time for each phase can thus be expressed as:
and->
The rated charge current can be known according to the battery performance, and the charge time of each charge stage can be rapidly determined according to the rated charge current in combination with the relationship between the charge current multiple and the charge time and the charge capacity.
Exemplary, the embodiment of the present invention provides a method for rapidly acquiring time during step charging, which is assumed to divide the charging process of a battery into 4 according to the performance of the batteryStage in which the rated current I of the battery 0 When the upper limit SOC is 100%, the total charge capacity c=c is measured at 58A 0 ＝58Ah，c 0 The rated capacity of the battery is set, and the charge cut-off voltage is 4.25V; when the upper limit of charging is K, K is 95%, and the charging cut-off voltage is 4.17V, wherein a 1 ＝1，a 2 ＝0.5，a 3 ＝a' 3 ＝0.3，a 4 ＝a' 4 ＝0.1，c 1 ＝0.6c 0 ，c 2 ＝0.2c 0 ，c 3 ＝c 3 ’＝0.13c 0 、c 4 ＝0.07c 0 ，c 4 ’＝0.02c 0 The following steps are:
c 0 ＝a 1 I 0 t 1 +a 2 I 0 t 2 +a 3 I 0 t 3 +a 4 I 0 t 4 ；
0.95c 0 ＝a 1 I 0 t 1 +a 2 I 0 t 2 +a' 3 I 0 t 3 '+a' 4 I 0 t 4 '；
namely: 1=1.0t 1 +0.5t 2 +0.3t 3 +0.1t 4 ；
0.95＝1.0t 1 +0.5t 2 +0.3t 3 '+0.1t 4 '；
1.0t 1 ＝0.6；
0.5t 2 ＝0.2；
0.3t 3 ＝0.3t 3 '＝0.13；
0.1t 4 ＝0.07；
0.1t 4 '＝0.02；
And (3) calculating: t is t 1 ＝0.6h，t 2 ＝0.4h，t 3 ＝t 3 ’＝0.43h，t 4 ＝0.7h，t 4 ’＝0.2h。
Fig. 3 is a schematic diagram showing the relationship between SOC and cut-off voltage, referring to fig. 3, when the upper limit SOC is 100%, charging is performed for 0.7h after charging enters the fourth stage charging, that is, the maximum voltage reaches 4.25V, and charging is completed; when the charge upper limit SOC is 95%, charging is completed after the charging enters the fourth stage charging, and charging is performed for 0.2h, namely, the maximum voltage reaches 4.17V.
Optionally, the product of the multiple of the charging current and the rated current is less than or equal to the maximum allowed charging current of the battery. Specifically, the charging current in each stage needs to be less than or equal to the maximum charging current allowed by the battery, so as to ensure charging safety.
Optionally, the charging capacity of each charging stage is smaller than the rated capacity of the battery. Specifically, the rated capacity of the battery can be known according to the type and the performance of the battery, the rated capacity is a known value, and the charging capacity of each stage needs to be smaller than the rated capacity, so that the charging safety is further improved.
Fig. 4 is a schematic structural diagram of a battery charge cut-off voltage testing device according to an embodiment of the present invention, referring to fig. 4, including:
a dividing module 110 for dividing the charging process into n charging stages according to the charging capability of the battery; wherein n is greater than 1 and is a positive integer;
an acquisition module 120, configured to acquire a charging capacity of each charging stage in which a state of charge is an upper limit value;
a setting module 130, configured to obtain a charging capacity of an n-1 th charging stage and a charging capacity of an n-th charging stage in the upper limit value of the charge state according to the relationship between the charging capacity and the charging capacity of each charging stage in the upper limit value of the charge state; wherein K is greater than 0 and less than 1; the charge capacity relationship is:
(c n-1 +c n )-(c' n-1 +c' n )＝(1-K)c；c' n-1 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase; c n-1 A charge capacity at an n-1-th charging stage in which the charge state is an upper limit value; c n A charge capacity at an nth charge stage having a charge state of an upper limit value; c is the total charge capacity with the charge state being the upper limit value; wherein c' n-1 ≤c n-1 And c' n ≤c n ；
The determining module 140 is configured to determine a charge cutoff voltage with a state of charge that is K times the upper limit value according to the cutoff voltage with the state of charge that is the upper limit value, a charge capacity of an n-1 th charging stage and a charge capacity of an n-th charging stage in the state of charge that is K times the upper limit value.
Specifically, the charging capability of the battery refers to the charging current multiple that the battery cell can withstand, and by way of example, the battery can be charged with charging current multiples of 1C, 0.5C, 0.3C and 0.1C, and the dividing module 110 can divide the battery into 4 charging phases. The State Of Charge (SOC) is a State Of Charge (State Of Charge) Of the battery Of 100%; for example, in the SOC of 100%, the acquiring module 120 may acquire the charge capacity of each charging stage according to a staged charging method in the related art.
The state of charge K times the upper limit value refers to a state in which the SOC is K, where K has a value between 0 and 1, for example, 90%,95%,97%, etc. The sum of the charge capacities at each stage in the 100% SOC state is the total charge capacity of the battery, and therefore, the step charge mode in which the SOC is 100% is:
c＝c 1 +c 2 +c 3 +...+c n-1 +c n ；
c 1 、c 2 、c 3 …c n-1 、c n the charging capacity corresponding to n charging stages;
the step charging mode with SOC of K is as follows:
c＝c 1 +c 2 +c 3 +...+c' n-1 +c' n ；
c' n-1 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase;
the setting module 130 sets the charge capacity of the n-1 th charging stage and the charge capacity of the n-th charging stage in the K-times upper limit value according to the charge capacity relationship.
For example, the charging is divided into 4 stages, and the total charge capacity c=c is measured when the upper charge limit SOC is 100% 0 =58 Ah, where c 1 ＝0.6c 0 ，c 2 ＝0.2c 0 ，c 3 ＝0.13c 0 、c 4 ＝0.07c 0 ，c 0 The step charge mode for the rated capacity of the battery, that is, the SOC of 100%, is:
c 0 ＝0.6c 0 +0.2c 0 +0.13c 0 +0.07c 0 。
when the upper limit of charging is K, K is 95%, and the following are:
0.95c 0 ＝0.6c 0 +0.2c 0 +c' 3 +c' 4
setting the charge state as the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the K times upper limit value according to the charge capacity relation; (0.13 c) 0 +0.07c 0 )-(c' 3 +c' 4 )＝0.05c 0 The method comprises the steps of carrying out a first treatment on the surface of the Setting c 3 ＝c 3 ’＝0.13c 0 Then it can be seen that c 4 ’＝0.02c 0 。
The determination module 140 performs charging according to the determined charge state at each stage of the charge capacity of the upper limit value of K times, and the charge capacity at the nth charge stage is c' n The battery maximum cell voltage Vmax 'corresponding to this stage can be obtained, the battery maximum cell voltage Vmax' is smaller than the cutoff voltage Vmax whose state of charge is the upper limit value, and the maximum cell voltage is the cutoff voltage whose SOC upper limit is K.
Optionally, the determining module includes:
a charging unit for charging the battery according to a charging capacity of the first n-2 charging stages having the upper limit value of the state of charge and a charging capacity of the nth-1 charging stage having the K times the upper limit value of the state of charge;
the determining unit is used for measuring the maximum monomer voltage of the battery after the charging of the nth charging stage is finished; when the maximum cell voltage is smaller than the cutoff voltage whose charge state is the upper limit value, the maximum cell voltage is determined as the charge cutoff voltage whose charge state is K times the upper limit value.
Specifically, the charging unit performs charging according to a step charging mode in which the SOC is K, wherein the charging capacities of the first n-2 charging stages adopt a charging mode in which the state of charge is an upper limit value, and the charging capacity of the n-1 charging stage is a set charging capacity.
The charging of the n-1 charging stage is finished, the charging enters the n charging stage, and the charging capacity of the n charging stage is c' n The determining unit may obtain a maximum cell voltage Vmax 'of the battery corresponding to the stage, where the maximum cell voltage Vmax' of the battery is smaller than a cut-off voltage Vmax whose state of charge is an upper limit value, and the maximum cell voltage is a cut-off voltage whose upper limit of SOC is K. The cutoff voltage Vmax whose state of charge is the upper limit value can be obtained according to the specification of the battery, and can be a known parameter.
The embodiment of the invention also provides electronic equipment, which comprises:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the battery charge cutoff voltage testing method of any of the embodiments of the present invention.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 5, 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., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may 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. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various 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, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, 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.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of 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, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above.
In some embodiments, the battery charge cutoff voltage testing method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the battery charge cutoff voltage testing method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the battery charge cutoff voltage test method in any other suitable manner (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out 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, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here 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 a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, 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: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A battery charge cutoff voltage testing method, comprising:
dividing a charging process into n charging stages according to the charging capability of the battery; wherein n is greater than 1 and is a positive integer;
acquiring a charging capacity of each charging stage with a charge state being an upper limit value;
obtaining the charging capacity of the n-1 charging stage and the charging capacity of the n charging stage in the upper limit value of the charge state according to the relationship between the charging capacity and the charging capacity of each charging stage in which the charge state is the upper limit value; 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 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase; c n-1 A charge capacity at an n-1-th charging stage in which the charge state is an upper limit value; c n A charge capacity at an nth charge stage having a charge state of an upper limit value; c is the total charge capacity with the charge state being the upper limit value; wherein c' n-1 ≤c n-1 And c' n ≤c n ；
And determining the charge cutoff voltage with the charge state being the K times of the upper limit value according to the cutoff voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the charge state being the K times of the upper limit value.
2. The battery charge cutoff voltage testing method according to claim 1, wherein determining the charge cutoff voltage for the state of charge of the K-times upper limit value based on the cutoff voltage for the state of charge of the upper limit value, the charge capacity of the n-1 th charging stage of the K-times upper limit value, and the charge capacity of the n-th charging stage, comprises:
charging the battery according to the charging capacity of the first n-2 charging stages with the charge state being the upper limit value and the charging capacity of the nth-1 charging stage with the charge state being K times the upper limit value, wherein n is more than 2;
the charging of the n-1 charging stage is finished, the charging enters the n charging stage, and the maximum monomer voltage of the battery is measured after the charging of the n charging stage is finished;
and when the maximum monomer voltage is smaller than the cut-off voltage with the charge state being the upper limit value, determining the maximum monomer voltage as the charge cut-off voltage with the charge state being K times the upper limit value.
3. The battery charge cutoff voltage testing method according to any one of claims 1-2, wherein acquiring the charge capacity of each charging stage having a state of charge of an upper limit value comprises:
acquiring preset charging capacity and preset charging current multiples of the previous 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 charging is completed in the first n-1 charging stages, 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 with the charge state being the upper limit value;
and determining the charging capacity and the charging current multiple of each charging stage of which the charge state is the upper limit value according to the relationship between the charging time and the preset time.
4. The battery charge cutoff voltage testing method according to claim 3, wherein determining the charge capacity and the charge 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 a preset time comprises:
and if the charging time exceeds the preset time, adjusting the preset charging capacity and/or the preset charging current multiple of at least one of the previous n-1 charging stages, and acquiring the charging time of the nth charging stage again until the charging time is smaller than or equal to the preset time, so as to determine the charging capacity and the charging current multiple of each charging stage.
5. The battery charge cutoff voltage testing method according to claim 3, wherein the charge capacity is a product of a charge time and a charge current; wherein the charging current is the product of the multiple of the charging current and the rated current;
after determining the charge cutoff voltage with the charge state being the K-times upper limit value according to the cutoff voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage with the charge state being the K-times upper limit value and the charge capacity of the n charge stage, the method further comprises:
and determining the charging time of each charging stage of which the charge state is K times of the upper limit value according to the charging capacity and the charging current.
6. The battery charge cutoff voltage testing method according to claim 5, wherein the product of the charge current multiple and the rated current is less than or equal to a maximum charge current allowed by the battery.
7. The battery charge cutoff voltage testing method according to claim 6, wherein the charge capacity of each of the charging stages is smaller than a rated capacity of the battery.
8. A battery charge cutoff voltage testing apparatus, comprising:
the division module is used for 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;
the acquisition module is used for acquiring the charging capacity of each charging stage with the charge state being the upper limit value;
the setting module is used for obtaining the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the upper limit value of the charge state which is K times according to the relationship between the charge capacity and the charge capacity of each charge stage of which the charge state is the upper limit value; 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 a charge capacity c 'of the n-1 th charging stage in the upper limit value of the charge state of K times' n Charge capacity for the nth charge phase; c n-1 A charge capacity at an n-1-th charging stage in which the charge state is an upper limit value; c n A charge capacity at an nth charge stage having a charge state of an upper limit value; c is the total charge capacity with the charge state being the upper limit value; wherein c' n-1 ≤c n-1 And c' n ≤c n ；
And the determining module is used for determining the charge cut-off voltage with the charge state being the K times of the upper limit value according to the cut-off voltage with the charge state being the upper limit value, the charge capacity of the n-1 charge stage and the charge capacity of the n charge stage in the charge state being the K times of the upper limit value.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the battery charge cutoff voltage testing method of any of claims 1-7.
10. A computer readable storage medium storing computer instructions for causing a processor to perform the battery charge cut-off voltage test method of any one of claims 1-7.
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