CN114200319A - Method and device for monitoring excessive thickness of battery, battery and electric equipment - Google Patents
Method and device for monitoring excessive thickness of battery, battery and electric equipment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 75
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Abstract
The application provides a method and a device for monitoring excessive thickness of a battery, the battery and electric equipment. The method comprises the following steps: calculating the current cycle number of the battery; calculating the current maximum chemical capacity Qmax of the battery; calculating a first order derivative of the current maximum chemical capacity to the current cycle number; judging whether the absolute value of the first-order derivative exceeds a first preset threshold value or not; or judging whether the ratio of the first-order derivative to the second-order derivative exceeds a second preset threshold value, wherein the second-order derivative is the first-order derivative of the previous maximum chemical capacity to the previous cycle turn number, and the previous cycle turn number is the cycle turn number of the previous cycle turn number; and when the absolute value of the first-order derivative exceeds a first preset threshold value, or when the ratio of the first-order derivative to the second first-order derivative exceeds a second preset threshold value, judging that the thickness of the battery exceeds a standard. The method provided by the application can be used for monitoring whether the thickness of the battery exceeds the standard in real time on line, and the use safety of the battery is guaranteed.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to a method and a device for monitoring excessive thickness of a battery, the battery and electric equipment.
Background
During the charging and discharging processes of the lithium ion battery, the thickness of the battery is increased due to side reactions such as lithium precipitation, gas generation and the like. Generally, the thickness of the battery should not increase beyond a set value, such as 10% of the initial thickness, within the number of cycles specified by the specifications of the battery. Exceeding the set value may cause damage to the terminal electronic device structure, even fire and explosion. Therefore, it is necessary to monitor whether the thickness of the battery is excessive.
In the prior art, a method for monitoring whether the thickness of a battery exceeds the standard is generally to attach a sensor to a rear cover of a battery compartment of a terminal or the battery, and the thickness of the battery is monitored in real time by the sensor in the use process of the battery, however, the sensor increases the equipment cost and occupies the available space of the battery, which causes the loss of energy density.
Disclosure of Invention
In view of the above problems, the present application provides a method and an apparatus for monitoring an excessive thickness of a battery, and an electrical device, which can monitor whether the thickness of the battery is excessive on line in real time, and can overcome or at least partially solve the problems of the prior art, such as an increase in the cost of the device and a reduction in the available space of the battery, caused by monitoring the thickness of the battery with a sensor.
According to one aspect of the application, a method for monitoring excessive thickness of a battery is provided, which comprises the steps of calculating the current cycle number of the battery; calculating the current maximum chemical capacity Qmax of the battery at the current cycle number; calculating a first order derivative of the current maximum chemical capacity to the current number of cycles; judging whether the absolute value of the first order derivative exceeds a first preset threshold value or not; or, judging whether the ratio of the first-order derivative to a second first-order derivative exceeds a second preset threshold, wherein the second first-order derivative is the first-order derivative of the previous maximum chemical capacity to the previous cycle turn number, the previous cycle turn number is the cycle turn number of the previous cycle turn number, and the previous maximum chemical capacity is the maximum chemical capacity corresponding to the battery at the previous cycle turn number; when the absolute value of the first-order derivative exceeds the first preset threshold, or when the ratio of the first-order derivative to the second first-order derivative exceeds the second preset threshold, the battery thickness is judged to be excessive, and whether the battery thickness exceeds the standard or not can be monitored online.
In an alternative mode, when the absolute value of the first derivative does not exceed the first preset threshold, or when the ratio of the first derivative to the second first derivative does not exceed the second preset threshold, it is determined that the battery thickness is not exceeded.
In an alternative mode, when the thickness of the battery is greater than 110% of the initial thickness of the battery, the battery thickness is considered to be out of specification.
In an alternative form, the step of calculating the first, first derivative of the maximum chemical capacity to the number of cycles is preceded by the method further comprising: acquiring the corresponding previous maximum chemical capacity of the battery at the previous cycle number; comparing the current maximum chemical capacity with the previous maximum chemical capacity; if the current maximum chemical capacity is less than or equal to the previous maximum chemical capacity, then entering the step of calculating a first order derivative of the maximum chemical capacity to the current cycle number; if the current maximum chemical capacity is larger than the previous maximum chemical capacity, calculating the current cycle number of the battery again, and counting the times of calculating the current cycle number of the battery again; and when the counted number of times of recalculating the current cycle number of the battery exceeds a first preset number of times, the step of obtaining the corresponding previous maximum chemical capacity of the battery at the previous cycle number of times is carried out, so that the misjudgment on whether the thickness of the battery exceeds the standard can be reduced.
In an alternative form, the first predetermined number of turns is between 10 and 50.
In an alternative form, the step of calculating the first, first derivative of the maximum chemical capacity to the number of cycles is preceded by the method further comprising: judging whether the current maximum chemical capacity is in a preset range or not; if yes, entering the step of calculating a first order derivative of the maximum chemical capacity to the current cycle number; if not, calculating the current cycle number of the battery again, and counting the number of times of calculating the current cycle number of the battery again; and when the counted number of times of recalculating the current cycle turns of the battery exceeds a second preset turn, the step of judging whether the current maximum chemical capacity is in a preset range is carried out, namely, whether the thickness of the battery exceeds the standard is specifically judged only when the current maximum chemical capacity of the battery is in the preset range, so that the misjudgment risk of judging whether the thickness of the battery exceeds the standard can be reduced.
In an alternative form, the second predetermined number of turns is between 10 and 50.
In an alternative mode, the step of determining whether the current maximum chemical capacity is within a preset range further includes: comparing the current maximum chemical capacity with a rated capacity of the battery; if the current maximum chemical capacity is smaller than the rated capacity and the current maximum chemical capacity is larger than 0.5 time of the rated capacity, judging that the current maximum chemical capacity is in a preset range; otherwise, judging that the current maximum chemical capacity is not in a preset range. The rated capacity of the battery is the capacity marked on the battery when the battery leaves a factory.
In an alternative mode, the step of calculating the current number of cycles of the battery further includes: acquiring a first discharging charge state difference value of the battery which is discharged again after the previous cycle number; if the first discharge state of charge difference value is larger than or equal to a preset value, accumulating one cycle number of the previous cycle to obtain the current cycle number; and if the first discharging state of charge difference value is smaller than a preset value, accumulating the percentage of the first discharging state of charge difference value by the number of previous cycles to obtain the number of current cycles. After the battery leaves a factory, theoretically, the battery is fully discharged and fully charged once, and is recorded as a cycle number, however, in practical application, the battery is not fully discharged every time of discharging, and is not fully charged every time of charging, so that the current cycle number of the battery is calculated through the above method, and the calculation method is more suitable for practical application, so that the calculated current cycle number of the battery is accurate, and the accuracy of monitoring whether the thickness of the battery exceeds the standard is improved.
In an alternative, the preset value is 80% SOC to 100% SOC.
In an alternative, the preset value is 80% SOC.
In an alternative mode, the step of calculating the current number of cycles of the battery further includes: acquiring a first charging state of charge difference value of the battery which is charged again after the previous cycle number; if the first charging state of charge difference value is larger than or equal to a preset value, accumulating one cycle number of the previous cycle to obtain the current cycle number; and if the first charging state of charge difference value is smaller than a preset value, accumulating the percentage of the first charging state of charge difference value by the number of previous cycles to obtain the number of current cycles.
In an alternative, the first preset threshold is 0.0003 × Qmax to 0.001 × Qmax.
In an alternative, the second preset threshold is 2 to 5.
In an alternative manner, the formula for calculating the current maximum chemical capacity of the battery at the current number of cycles is:
wherein Qmax is the current maximum chemical capacity; the Qp is the electric quantity flowing into the battery or the electric quantity flowing out of the battery when the previous standing state is changed to the current standing state, and the previous standing state is the previous standing state of the current standing state; wherein the S2 is the state of charge of the previous resting state; wherein the S1 is the state of charge of the current rest state.
In an alternative, the resting state is a state in which the battery is neither charged nor discharged.
According to an aspect of the embodiments of the present application, there is provided a device for monitoring an excessive thickness of a battery, including a first calculating module, configured to calculate a current number of cycles of the battery; a second calculation module for calculating a current maximum chemical capacity of the battery at the current number of cycles; a third calculation module for calculating a first, first order derivative of the current maximum chemical capacity to the current number of cycles; the judging module is used for judging whether the absolute value of the first order derivative exceeds a first preset threshold value or not; or, judging whether the ratio of the first-order derivative to a second first-order derivative exceeds a second preset threshold, wherein the second first-order derivative is the first-order derivative of the previous maximum chemical capacity to the previous cycle turn number, the previous cycle turn number is the cycle turn number of the previous cycle turn number, and the previous maximum chemical capacity is the maximum chemical capacity corresponding to the battery at the previous cycle turn number; and the judging module is used for judging that the thickness of the battery exceeds the standard when the absolute value of the first order derivative exceeds the first preset threshold or the ratio of the first order derivative to the second first order derivative exceeds the second preset threshold.
According to an aspect of an embodiment of the present application, there is provided a battery including: at least one processor, and a memory communicatively coupled to the at least one processor, the memory storing instructions executable by the at least one processor to enable the at least one processor to perform a method as described above.
According to an aspect of the embodiments of the present application, there is provided a powered device including the monitoring apparatus or the battery as described above.
The beneficial effect of this application includes: the method is different from the existing monitoring method of the excessive thickness of the battery depending on the sensor, and the current cycle number of the battery is calculated; calculating the current maximum chemical capacity Qmax of the battery at the current cycle number; calculating a first order derivative of the current maximum chemical capacity to the current number of cycles; judging whether the absolute value of the first order derivative exceeds a first preset threshold value or not; or, judging whether the ratio of the first-order derivative to a second first-order derivative exceeds a second preset threshold, wherein the second first-order derivative is the first-order derivative of the previous maximum chemical capacity to the previous cycle turn number, the previous cycle turn number is the cycle turn number of the previous cycle turn number, and the previous maximum chemical capacity is the maximum chemical capacity corresponding to the battery at the previous cycle turn number; when the absolute value of the first-order derivative exceeds the first preset threshold value, or when the ratio of the first-order derivative to the second first-order derivative exceeds the second preset threshold value, the battery thickness is judged to be excessive, real-time online monitoring whether the battery thickness exceeds the standard is achieved, and whether the battery thickness exceeds the standard can be monitored through a hardware structure running program built in the battery, so that the hardware cost is not required to be additionally increased, the available space of the battery can be improved, and the loss of energy density is reduced.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic flow chart of a method for monitoring excessive thickness of a battery according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a process for calculating the current number of cycles of a battery according to an embodiment of the present disclosure;
FIG. 3 is a graph of current maximum chemical capacity of a battery versus current number of cycles provided by an embodiment of the present application;
FIG. 4-1 is a graph of thickness growth versus current cycle count for a normal battery provided in an embodiment of the present application;
4-2 is a graph of thickness growth versus current cycle count for an over-rated thickness battery provided by an embodiment of the present application;
FIG. 5-1 is a graph of a first derivative of a normal battery versus a current number of cycles as provided by an embodiment of the present application;
5-2 is a graph of a first derivative of an over-rated thickness battery versus the number of current cycles provided by an embodiment of the present application;
FIG. 6 is a schematic flow chart of another method for monitoring excessive thickness of a battery according to an embodiment of the present disclosure;
fig. 7 is a schematic flowchart of a method for monitoring excessive thickness of a battery according to a second embodiment of the present application;
fig. 8 is a schematic flowchart of a method for monitoring excessive thickness of a battery according to a third embodiment of the present application;
FIG. 9 is a schematic diagram of a device for monitoring excessive thickness of a battery according to a fourth embodiment of the present application;
fig. 10 is a schematic diagram of a hardware structure of a battery for performing a monitoring method for excessive thickness of the battery according to an embodiment of the present application;
FIG. 11 is a schematic diagram of an implementation of a powered device provided by an embodiment of the present application;
fig. 12 is a schematic diagram of another implementation manner of an electrical device provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.
In addition, the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
Example one
After the battery leaves a factory, the battery thickness is increased due to side reactions such as lithium precipitation and gas generation in the process of charging and discharging. Generally, the thickness of the battery should not exceed a predetermined value during use within the number of cycles specified in the specification of the battery.
For example, the number of cycles specified in the specification of the battery is 1000, the preset value is 110% of the initial thickness of the battery, and if the thickness of the battery exceeds 110% of the initial thickness of the battery when the number of cycles of the battery does not reach 1000 in the use process of the battery, the thickness of the battery is considered to be out of limits. The above data are merely examples, and the number of cycles specified in the specification of the battery may have other values, and the preset value for judging whether the thickness of the battery exceeds the standard may have other values.
The thickness of the battery exceeds the preset value, which may cause damage to the terminal electronic device structure, even fire explosion and other adverse consequences.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a method for monitoring excessive battery thickness according to an embodiment of the present disclosure. The method comprises the following steps:
in step S10, the current number of cycles of the battery is calculated.
After the battery leaves a factory, theoretically, the battery is fully discharged-fully charged once and is counted as one cycle number, and the current cycle number is considered to be 2 when the battery undergoes the processes of fully discharging-fully charging-fully discharging-fully charging, however, in practical application, the battery is not fully discharged every time of discharging and is not fully charged every time of charging, so that the step of calculating the current cycle number of the battery is not limited to the above-mentioned steps of fully discharging-fully charging the battery, and only one cycle number is counted.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a process for calculating the current number of cycles of a battery according to an embodiment of the present disclosure. From fig. 2, step S10 includes the following steps:
step S101, acquiring a first discharging state-of-charge difference value of the battery which is discharged again after the previous cycle number, if the first discharging state-of-charge difference value is larger than or equal to a preset value, executing step S102, and accumulating one cycle number of the previous cycle number to obtain the current cycle number; if the first discharging state of charge difference is smaller than the preset value, step S103 is executed to add the percentage of the first discharging state of charge difference to the previous cycle number to obtain the current cycle number.
Wherein the previous cycle number is the previous cycle number of the current cycle number. And when the current cycle number is the first charge-discharge cycle after the battery leaves the factory, the previous cycle number is zero.
The first discharge state of charge difference is the difference between the state of charge before the first discharge and the state of charge after the first discharge, wherein the charging step can be performed after the previous cycle number and before the first discharge.
Wherein, SOC is StateofPower, state of charge.
In some embodiments, the predetermined value ranges from 80% SOC to 100% SOC.
In some embodiments, the preset value is 80% SOC.
For example, if the state of charge before the first discharge is 100% SOC and the state of charge after the first discharge is 10% SOC, the first discharge state of charge difference is 90% SOC. For example, if the previous cycle count is 20, the preset value is 80% SOC, the first discharge state of charge difference is 90% SOC, and if the first discharge state of charge difference is greater than the preset value, the current cycle count is 20+1 — 21.
For example, if the state of charge before the first discharge is 100% SOC and the state of charge after the first discharge is 80% SOC, the first discharge state of charge difference is 20% SOC. For example, if the previous cycle count is 20, the preset value is 80% SOC, the first discharge state of charge difference is 20% SOC, and the percentage of the first discharge state of charge difference is 20%, the current cycle count is 20+ 20% — 20.2.
The step of calculating the current number of cycles of the battery is not limited to the above step S101, step S102 and step S103, but may be in other forms, for example, calculation based on the charging condition of the battery. Specifically, the step of calculating the current number of cycles of the battery includes: acquiring a first charging state-of-charge difference value of the battery which is charged again after the previous cycle number, and if the first charging state-of-charge difference value is greater than or equal to a preset value, accumulating the previous cycle number by one to obtain the current cycle number; and if the first charging state of charge difference is smaller than the preset value, accumulating the percentage of the first charging state of charge difference by the previous cycle number to obtain the current cycle number. The first charging state of charge difference is the difference between the state of charge after the first charging and the state of charge before the first charging. For a specific implementation manner of the current cycle number of the battery calculated according to the charging condition of the battery, reference may be made to step S101, step S102, and step S103, which are not described herein again.
Step S20, calculate the current maximum chemical capacity Qma of the battery at the current cycle count.
In some embodiments, the formula for calculating the current maximum chemical capacity of the battery at the current cycle count is:
where Qmax is the current maximum chemical capacity.
Wherein Qp is the amount of electricity flowing into or out of the battery when the previous standing state changes to the current standing state, and the previous standing state is the previous standing state of the current standing state.
Wherein S2 is the state of charge of the previous rest state.
Wherein S1 is the state of charge of the current rest state.
Here, the static state is a state in which the battery is neither charged nor discharged.
For example, when the state of charge of the battery in the previous static state is 80% SOC, the state of charge of the battery in the current static state is 30% SOC, and the amount of electricity discharged from the battery when the previous static state changes to the current static state is 500mAh (milliampere hours), the current maximum chemical capacity calculated by the above formula is 1000 mAh.
In step S30, a first derivative of the current maximum chemical capacity to the current cycle count is calculated.
Step S40a, determining whether the absolute value of the first-order derivative exceeds a first preset threshold, and when the absolute value of the first-order derivative exceeds the first preset threshold, performing step S50 to determine that the thickness of the battery exceeds the standard.
After the battery leaves the factory, in the process of charging and discharging, the maximum chemical capacity of the battery is lost, please refer to fig. 3, and the current maximum chemical capacity of the battery is continuously reduced along with the increase of the current cycle number.
During the charging and discharging process of the battery, the thickness of the battery is increased due to side reactions such as lithium precipitation, gas generation and the like.
Referring to fig. 4-1, fig. 4-1 is a graph of the thickness increase of a normal battery and the current number of cycles, where the thickness of the normal battery, i.e., the battery, does not exceed the upper thickness limit (e.g., 110% of the initial thickness of the battery) set when the battery leaves the factory, i.e., the thickness increase of the battery does not exceed the difference between the upper thickness limit and the initial thickness of the battery set when the battery leaves the factory. From fig. 4-1, while the thickness of the normal battery increases with increasing current cycle count, the thickness of the normal battery does not increase more than 10% of the initial thickness of the battery.
Referring to fig. 4-2, fig. 4-2 is a graph of a relationship between a thickness increase of a battery with an excessive thickness and a current number of cycles, where the thickness of the battery with the excessive thickness exceeds an upper thickness limit (e.g., 110% of an initial thickness of the battery) set when the battery leaves a factory as the current number of cycles increases, that is, the thickness increase of the battery exceeds a difference between the upper thickness limit and the initial thickness of the battery set when the battery leaves the factory. From fig. 4-2, the rate of thickness growth of a super-thick battery is fast when the number of current cycles is between 400 and 600.
Referring to fig. 5-1 and 5-2 together, fig. 5-1 is a graph of the first one-step derivative of a normal battery versus the current number of cycles, and fig. 5-2 is a graph of the first one-step derivative of an over-rated thickness battery versus the current number of cycles. From fig. 5-1, during the charge and discharge cycles of the battery, as the current cycle number increases, the current maximum chemical capacity of the normal battery increases and decreases with the first one-step derivative of the current cycle number, but the fluctuation range of the first one-step derivative is not large. However, from fig. 5-2, when the current number of cycles exceeds a certain value, the absolute value of the first derivative of the battery sharply increases, and compared to fig. 5-1, the battery thickness is considered to be out of limits at the point when the absolute value of the first derivative of the battery sharply increases.
In summary, when the absolute value of the first-order derivative of the battery exceeds a first preset threshold, it is determined that the thickness of the battery exceeds the standard.
In some embodiments, the first predetermined threshold value ranges from 0.0003 × Qmax to 0.001 × Qmax. The specific value of the first preset threshold value can be reasonably set according to the actual condition of the battery.
In some embodiments, referring to fig. 6, it can be determined whether the ratio of the first derivative to the second first derivative exceeds a second predetermined threshold through step S40b, and when the ratio of the first derivative to the second first derivative exceeds the second predetermined threshold, step S50 is executed to determine that the thickness of the battery exceeds the threshold.
And the second first-order derivative is a first-order derivative of the previous maximum chemical capacity to the previous cycle number, wherein the previous cycle number is the cycle number of the previous cycle number, and the previous maximum chemical capacity is the maximum chemical capacity corresponding to the battery at the previous cycle number.
In some embodiments, the second predetermined threshold value ranges from 2 to 5. The specific value of the second preset threshold can be reasonably set according to the actual condition of the battery.
It should be noted that, when the absolute value of the first derivative does not exceed the first preset threshold, and when the ratio of the first derivative to the second first derivative does not exceed the second preset threshold, it is determined that the battery thickness is not exceeded.
The 1218 batteries are monitored by the monitoring method for the excessive thickness of the batteries, the monitoring result is that 11 batteries with the excessive thickness are monitored, the thicknesses of the 11 batteries monitored by actual measurement exceed 110% of the initial thickness, and no misjudgment is made.
In the embodiment of the present application, by calculating the current cycle number of the battery, calculating the current maximum chemical capacity Qmax of the battery at the current cycle number, calculating a first-order derivative of the current maximum chemical capacity to the current cycle number, and determining whether an absolute value of the first-order derivative exceeds a first preset threshold, or determining whether a ratio of the first-order derivative to a second first-order derivative exceeds a second preset threshold, wherein the second first-order derivative is a first-order derivative of a previous maximum chemical capacity to a previous cycle number, wherein the previous cycle number is a cycle number one time before the current cycle number, wherein the previous maximum chemical capacity is a maximum chemical capacity corresponding to the battery at the previous cycle number, and when the absolute value of the first-order derivative exceeds the first preset threshold, or when the ratio of the first-order derivative to the second first-order derivative exceeds the second preset threshold, the method for monitoring the excessive thickness of the battery can be executed through a built-in hardware structure of the battery, so that a detection device is not required to be additionally arranged to monitor the excessive thickness of the battery, the equipment cost of the battery is not additionally increased, and the available space of the battery is not additionally occupied.
Example two
Referring to fig. 7, fig. 7 is a schematic flowchart of a method for monitoring excessive thickness of a battery according to a second embodiment of the present application, and from fig. 7, the method includes the following steps in addition to step S10, step S20, step S30, step S40a, and step S50 in the first embodiment:
and step S21a, acquiring the corresponding previous maximum chemical capacity of the battery at the previous cycle number.
Step S22a, comparing the current maximum chemical capacity with the previous maximum chemical capacity, if the current maximum chemical capacity is less than or equal to the previous maximum chemical capacity, then entering step S30, calculating the first order derivative of the maximum chemical capacity to the current cycle number, if the current maximum chemical capacity is greater than the previous maximum chemical capacity, then executing step S23a,
referring to fig. 3, during the battery charging and discharging cycle, the current maximum chemical capacity of the battery is a decreasing trend along with the increase of the current cycle number of the battery, however, when the battery just starts to enter the charging and discharging cycle, the maximum chemical capacity of the battery may increase, and if it is determined that the battery thickness exceeds the maximum current chemical capacity, an erroneous determination may occur, so the erroneous determination is reduced through step S22 a. Specifically, if the current maximum chemical capacity is less than or equal to the previous maximum chemical capacity, the method may enter step S30, calculate a first order derivative of the maximum chemical capacity to the current cycle number, and then determine whether the thickness of the battery exceeds the previous maximum chemical capacity, if the current maximum chemical capacity is greater than the previous maximum chemical capacity, the method may enter step S23a, need to calculate the current cycle number of the battery again, count the number of times of calculating the current cycle number of the battery again, and when the counted number of times of calculating the current cycle number of the battery again exceeds a first preset number, the method may enter step S21a again, and only when the current maximum chemical capacity is less than or equal to the previous maximum chemical capacity, the method may enter step S30, and then determine whether the thickness of the battery exceeds the previous maximum chemical capacity.
And S23a, recalculating the current cycle number of the battery, counting the number of times of recalculating the current cycle number of the battery, and entering the step S21a when the counted number of times of recalculating the current cycle number of the battery exceeds a first preset number of times.
In some embodiments, the first predetermined number of turns ranges from 10 to 50.
In some embodiments, the first predetermined number of turns takes the value of 50.
It is understood that the steps S21a, S22a and S23a are also applicable to the case where the monitoring method for the excessive thickness of the battery in the first embodiment includes the steps S10, S20, S30, S40b and S50.
In the embodiment of the application, the previous maximum chemical capacity corresponding to the battery at the previous cycle number is obtained, the current maximum chemical capacity is compared with the previous maximum chemical capacity, if the current maximum chemical capacity is smaller than or equal to the previous maximum chemical capacity, the step of calculating the first one-step derivative of the maximum chemical capacity to the current cycle number is carried out, if the current maximum chemical capacity is larger than the previous maximum chemical capacity, the current cycle number of the battery is calculated again, the number of times of recalculating the current cycle number of the battery is counted, when the counted number of times of recalculating the current cycle number of the battery exceeds the first preset number, the step of obtaining the previous maximum chemical capacity corresponding to the battery at the previous cycle number is carried out, namely, only when the current maximum chemical capacity is within the preset range, the monitoring step of exceeding the battery thickness is carried out, therefore, the misjudgment rate of judging whether the thickness of the battery exceeds the standard can be reduced.
EXAMPLE III
Referring to fig. 8, fig. 8 is a schematic flow chart of a method for monitoring excessive thickness of a battery according to a third embodiment of the present application, and from fig. 8, the method includes the following steps in addition to step S10, step S20, step S30, step S40a, and step S50 in the first embodiment:
step S21b, determining whether the current maximum chemical volume is within a preset range, if yes, proceeding to step S30, otherwise, executing step S22 b.
In the battery charge-discharge cycle process, the current maximum chemical capacity of the battery has a value range, namely the current maximum chemical capacity is within a preset range in the normal cycle process of the battery, the current maximum chemical capacity is not necessarily caused by the excessive battery thickness when exceeding the preset range, and when the excessive battery thickness is monitored, the condition that the current maximum chemical capacity of the battery is not within the preset range needs to be eliminated, so that the misjudgment is reduced.
In some embodiments, the method for determining whether the current maximum chemical capacity is within the preset range includes comparing the current maximum chemical capacity with a rated capacity of the battery, and if the current maximum chemical capacity is smaller than the rated capacity and the current maximum chemical capacity is greater than 0.5 times of the rated capacity, determining that the current maximum chemical capacity is within the preset range, otherwise, determining that the current maximum chemical capacity is not within the preset range.
Wherein, the rated capacity of the battery is the capacity marked on the battery when the battery leaves a factory.
And S22b, recalculating the current cycle number of the battery, counting the number of times of recalculating the current cycle number of the battery, and entering the step S21b when the counted number of times of recalculating the current cycle number of the battery exceeds a second preset number of times.
Counting the number of times of recalculating the current cycle number of the battery by recalculating the current cycle number of the battery again, re-entering step S21b when the counted number of times of recalculating the current cycle number of the battery exceeds a first preset number of times, entering step S30 only when the current maximum chemical capacity is within a preset range, and subsequently judging whether the thickness of the battery exceeds the standard.
In some embodiments, the second predetermined number of turns ranges from 10 to 50.
In some embodiments, the second predetermined number of turns takes the value of 50.
It is understood that the steps S22a and S22b are also applicable to the case where the monitoring method for excessive battery thickness in the first embodiment includes the steps S10, S20, S30, S40b and S50.
It should be noted that the third embodiment can also be combined with the second embodiment, and the technical solution formed by combining the third embodiment and the second embodiment is also within the protection scope of the embodiments of the present application.
It is to be noted that the execution sequence of step S21a, step S22a, and step S23a, and the execution sequence of step S21b and step S22b are all within the scope of the present application as long as they are feasible.
In the embodiment of the application, whether the current maximum chemical capacity is in a preset range or not is judged, if yes, the step of calculating the first one-order derivative of the maximum chemical capacity to the current cycle number is carried out, if not, the current cycle number of the battery is calculated again, the number of times of calculating the current cycle number of the battery again is counted, and when the counted number of times of calculating the current cycle number of the battery again exceeds the second preset number, the step of judging whether the current maximum chemical capacity is in the preset range or not is carried out, so that the misjudgment rate of judging whether the thickness of the battery exceeds the standard can be reduced.
Example four
Referring to fig. 9, fig. 9 is a schematic diagram of a device for monitoring excessive battery thickness according to an embodiment of the present disclosure, where the device for monitoring excessive battery thickness includes: a first calculation module 201, a second calculation module 202, a third calculation module 203, a judgment module 204 and a decision module 205. The first calculating module 201 is configured to calculate a current number of cycles of the battery. A second calculating module 202, configured to calculate a current maximum chemical capacity of the battery at the current cycle number. A third calculation module 203 for calculating a first order derivative of the current maximum chemical capacity to the current cycle number. The determining module 204 is configured to determine whether an absolute value of the first-order derivative exceeds a first preset threshold, or determine whether a ratio of the first-order derivative to a second first-order derivative exceeds a second preset threshold, where the second first-order derivative is a first derivative of a previous maximum chemical capacity to a previous cycle number, where the previous cycle number is a cycle number of a previous cycle number, and the previous maximum chemical capacity is a maximum chemical capacity corresponding to the battery when the previous cycle number is reached. The determining module 205 is configured to determine that the thickness of the battery exceeds a predetermined value when an absolute value of the first-order derivative exceeds a first predetermined threshold, or when a ratio of the first-order derivative to the second first-order derivative exceeds a second predetermined threshold.
In the embodiment of the present application, a current cycle number of the battery is calculated by the first calculating module 201, a current maximum chemical capacity of the battery at the current cycle number is calculated by the second calculating module 202, a first-order derivative of the current maximum chemical capacity to the current cycle number is calculated by the third calculating module 203, and whether an absolute value of the first-order derivative exceeds a first preset threshold or not is judged by the judging module 204, or whether a ratio of the first-order derivative to the second-order derivative exceeds a second preset threshold, wherein the second-order derivative is a first-order derivative of a previous maximum chemical capacity to a previous cycle number, wherein the previous cycle number is a cycle number of a previous cycle before the current cycle number, wherein the previous maximum chemical capacity is a maximum chemical capacity corresponding to the battery at the previous cycle number, and when the absolute value of the first-order derivative exceeds the first preset threshold by the judging module 205, or when the ratio of the first order derivative to the second first order derivative exceeds a second preset threshold, the battery thickness is judged to exceed the standard, and through the device, whether the battery thickness exceeds the standard can be monitored on line, and whether the battery thickness exceeds the standard is monitored without additionally increasing a detection device, so that the equipment cost of the battery is not additionally increased, and the available space of the battery is not additionally occupied.
EXAMPLE five
Referring to fig. 10, fig. 10 is a schematic diagram of a hardware structure of a battery for performing a monitoring method for excessive thickness of the battery according to an embodiment of the present disclosure. The battery includes: one or more processors 51 and a memory 52, one for example in fig. 10.
The processor 51 and the memory 52 may be connected by a bus or other means, and in the embodiment of the present application, the bus connection is taken as an example.
The memory 52 is a non-volatile computer readable storage medium, and can be used for storing non-volatile software programs, non-volatile computer executable programs, and modules, such as program instructions/modules (for example, the modules shown in fig. 9) corresponding to the monitoring method for excessive battery thickness in the embodiment of the present application. The processor 51 executes various functional applications and data processing of the monitoring device for excessive battery thickness by running nonvolatile software programs, instructions and modules stored in the memory 52, that is, the method for monitoring excessive battery thickness according to the above-mentioned method embodiment is realized.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of a monitoring device in which the thickness of the battery exceeds a standard, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 52 optionally comprises a memory remotely located with respect to the processor 51, and these remote memories may be connected via a network to a monitoring device that is out of compliance with battery thickness. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory 52 and, when executed by the one or more processors 51, perform the method for monitoring for excessive battery thickness in any of the above-described method embodiments.
The product can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.
The embodiment of the application provides a nonvolatile computer readable storage medium, and a computer executable instruction is stored in the nonvolatile computer readable storage medium, and the computer executable instruction is used for a battery to execute the monitoring method for the excessive thickness of the battery in any method embodiment.
Embodiments of the present application provide a computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the method for monitoring excessive battery thickness in any of the above-described method embodiments.
EXAMPLE six
The application also provides an embodiment of an electrical device. In some embodiments, referring to fig. 11, the electric device includes the monitoring apparatus for excessive battery thickness in the fourth embodiment; in other embodiments, referring to fig. 12, the electric device includes the battery of the fifth embodiment. The electric equipment can be an energy storage product, a mobile phone, a tablet, an unmanned aerial vehicle, a single wheel or an electric vehicle with more than two wheels, or an electric cleaning tool and the like.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, and the program can be stored in a computer readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (12)
1. A method for monitoring excessive thickness of a battery is characterized by comprising the following steps:
calculating the current cycle number of the battery;
calculating the current maximum chemical capacity Qmax of the battery at the current cycle number;
calculating a first order derivative of the current maximum chemical capacity to the current number of cycles;
judging whether the absolute value of the first order derivative exceeds a first preset threshold value or not;
alternatively, the first and second electrodes may be,
judging whether the ratio of the first-order derivative to a second first-order derivative exceeds a second preset threshold value or not, wherein the second first-order derivative is the first-order derivative of the previous maximum chemical capacity to the previous cycle number, the previous cycle number is the cycle number of the previous cycle number, and the previous maximum chemical capacity is the maximum chemical capacity corresponding to the battery in the previous cycle number;
and when the absolute value of the first-order derivative exceeds the first preset threshold, or when the ratio of the first-order derivative to the second first-order derivative exceeds the second preset threshold, judging that the thickness of the battery exceeds the standard.
2. The method of claim 1, wherein the step of calculating the first, first derivative of the maximum chemical capacity to the number of cycles is preceded by the method further comprising:
acquiring the corresponding previous maximum chemical capacity of the battery at the previous cycle number;
comparing the current maximum chemical capacity with the previous maximum chemical capacity;
if the current maximum chemical capacity is less than or equal to the previous maximum chemical capacity, then entering the step of calculating a first order derivative of the maximum chemical capacity to the current cycle number;
if the current maximum chemical capacity is larger than the previous maximum chemical capacity, calculating the current cycle number of the battery again, and counting the times of calculating the current cycle number of the battery again;
and when the counted number of times of recalculating the current cycle number of the battery exceeds a first preset number of times, entering the step of acquiring the corresponding previous maximum chemical capacity of the battery at the previous cycle number of times.
3. The method according to any one of claims 1 or 2, wherein the step of calculating the first derivative of the maximum chemical capacity to the number of cycles is preceded by the method further comprising:
judging whether the current maximum chemical capacity is in a preset range or not;
if yes, entering the step of calculating a first order derivative of the maximum chemical capacity to the current cycle number;
if not, calculating the current cycle number of the battery again, and counting the number of times of calculating the current cycle number of the battery again;
and when the counted number of times of recalculating the current cycle turns of the battery exceeds a second preset turn, the step of judging whether the current maximum chemical capacity is in a preset range is carried out.
4. The method of claim 3, wherein the step of determining whether the current maximum chemical capacity is within a preset range further comprises:
comparing the current maximum chemical capacity with a rated capacity of the battery;
if the current maximum chemical capacity is smaller than the rated capacity and the current maximum chemical capacity is larger than 0.5 time of the rated capacity, judging that the current maximum chemical capacity is in a preset range;
otherwise, judging that the current maximum chemical capacity is not in a preset range.
5. The method of claim 1, wherein the step of calculating the current number of cycles of the battery further comprises:
acquiring a first discharging charge state difference value of the battery which is discharged again after the previous cycle number;
if the first discharge state of charge difference value is larger than or equal to a preset value, accumulating one cycle number of the previous cycle to obtain the current cycle number;
and if the first discharging state of charge difference value is smaller than a preset value, the battery enables the previous cycle number to be accumulated by the percentage of the first discharging state of charge difference value to obtain the current cycle number.
6. The method of claim 5, wherein the preset value is 80% SOC to 100% SOC.
7. The method of claim 1, wherein the first predetermined threshold is 0.0003 xQmax to 0.001 xQmax.
8. The method according to claim 1, wherein the second preset threshold is 2 to 5.
9. The method of claim 1, wherein the formula for calculating the current maximum chemical capacity of the battery at the current number of cycles is:
wherein Qmax is the current maximum chemical capacity;
the Qp is the electric quantity flowing into the battery or the electric quantity flowing out of the battery when the previous standing state is changed to the current standing state, and the previous standing state is the previous standing state of the current standing state;
wherein the S2 is the state of charge of the previous resting state;
wherein the S1 is the state of charge of the current rest state.
10. A monitoring device that battery thickness exceeds standard, its characterized in that includes:
the first calculation module is used for calculating the current cycle number of the battery;
a second calculation module for calculating a current maximum chemical capacity of the battery at the current number of cycles;
a third calculation module for calculating a first, first order derivative of the current maximum chemical capacity to the current number of cycles;
the judging module is used for judging whether the absolute value of the first order derivative exceeds a first preset threshold value or not;
alternatively, the first and second electrodes may be,
judging whether the ratio of the first-order derivative to a second first-order derivative exceeds a second preset threshold value or not, wherein the second first-order derivative is the first-order derivative of the previous maximum chemical capacity to the previous cycle number, the previous cycle number is the cycle number of the previous cycle number, and the previous maximum chemical capacity is the maximum chemical capacity corresponding to the battery in the previous cycle number;
and the judging module is used for judging that the thickness of the battery exceeds the standard when the absolute value of the first order derivative exceeds the first preset threshold or the ratio of the first order derivative to the second first order derivative exceeds the second preset threshold.
11. A battery, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor, the memory storing instructions executable by the at least one processor to enable the at least one processor to perform the method of any of claims 1-9.
12. An electrical device comprising the monitoring device of claim 10 or the battery of claim 11.
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