CN110133515B - Method and device for determining remaining energy of battery - Google Patents
Method and device for determining remaining energy of battery Download PDFInfo
- Publication number
- CN110133515B CN110133515B CN201910212869.5A CN201910212869A CN110133515B CN 110133515 B CN110133515 B CN 110133515B CN 201910212869 A CN201910212869 A CN 201910212869A CN 110133515 B CN110133515 B CN 110133515B
- Authority
- CN
- China
- Prior art keywords
- battery
- value
- energy
- preset
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a method and a device for determining battery residual energy, wherein the method comprises the following steps: acquiring a capacity change value of a battery and the temperature of the battery in the process of changing the energy of the battery from a first preset value to a second preset value; and determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference between the first preset value and the second preset value. The method and the device for determining the residual energy of the battery can improve the accuracy of the determined residual energy of the battery.
Description
Technical Field
The invention relates to the field of batteries, in particular to a method and a device for determining battery residual energy.
Background
The performance of a power battery as an energy storage unit of an electric device directly affects the fuel economy and the dynamic performance of the device. Because the actual operating environment of an electrically powered device is very complex and diverse, an effective battery management system is necessary to ensure efficient, reliable, and safe operation of the power battery pack.
The core task of the battery management system is to estimate the internal state of the battery, and poor state quantity estimation value often causes larger state quantity fluctuation than expected, thereby reducing the cycle life of the battery, reducing the energy utilization efficiency of the electric equipment, and having great negative effects on charging and equalization control. Particularly, estimation Of a State Of Energy (SOE) is important for presetting the service time Of the battery, and is also a difficult point in battery management and control.
In the prior art, there are many ways to estimate the SOE, however, these ways have the problem of large estimation error.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining residual energy of a battery, which are used for solving the problem of large estimation error of the residual energy of the battery in the prior art.
In order to solve the above problems, an embodiment of the present invention provides a method for determining remaining battery energy, where the method includes:
acquiring a capacity change value of a battery and the temperature of the battery in the process of changing the energy of the battery from a first preset value to a second preset value;
and determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference between the first preset value and the second preset value.
Optionally, the step of obtaining the capacity change value of the battery and the temperature of the battery in the process of changing the energy of the battery from the first preset value to the second preset value includes:
sequentially acquiring the voltage value and the current value of the battery at each time point from the condition that the energy of the battery is a first preset value, and calculating the energy change value corresponding to each time point according to the voltage value and the current value of the battery at each time point;
if the sum of the energy change values corresponding to all time points in a target time period reaches a target change value, acquiring the temperature of the battery in the target time period, and calculating the capacity change value of the battery in the target time period, wherein the energy of the battery in the target time period changes from the first preset value to a second preset value, and the target change value is the difference value between the first preset value and the second preset value.
Optionally, the step of determining the remaining energy of the battery according to the energy variation value of the battery, the capacity variation value of the battery, and the temperature of the battery includes:
calculating a proportionality coefficient according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery;
determining the remaining energy of the battery based on a preset mapping relation, the scaling factor and the temperature of the battery, wherein the preset mapping relation comprises a mapping relation among the remaining energy of the battery, the scaling factor and the temperature of the battery.
Optionally, the method further includes:
if the battery finishes full charge or full discharge, calculating a difference value between a preset total energy value and an actual total energy change value, wherein the actual total energy change value is the sum of the energy change values of the battery in the process of full charge or full discharge of the battery;
if the difference value between the preset total energy value and the actual total energy change value is larger than a preset value, updating the proportionality coefficient in the preset mapping relation to be a first proportionality coefficient, wherein the first proportionality coefficient is obtained by calculation in the full-charge or full-discharge process of the battery.
Optionally, the first ratio coefficient includes a plurality of first ratio example coefficients sequentially obtained in a full charge or full discharge process, and a plurality of second ratio example coefficients obtained by a linear difference algorithm between two adjacent first ratio example coefficients obtained.
Optionally, the change energy value of the corresponding battery between the two adjacent obtained first ratio example coefficients is 4-10% of the actual total energy change value.
Optionally, the preset mapping relationship is a mapping relationship that the residual energy, the proportionality coefficient and the temperature of the battery are obtained for the battery in advance, and the mapping relationship is generated according to the obtained residual energy, the proportionality coefficient and the temperature of the battery.
In order to solve the above problem, an embodiment of the present invention further provides a device for determining remaining battery energy, including:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a capacity change value of a battery and the temperature of the battery in the process that the energy of the battery is changed from a first preset value to a second preset value;
the determining module is used for determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is a difference value between the first preset value and the second preset value.
Optionally, the obtaining module includes:
the first calculating unit is used for sequentially acquiring the voltage value and the current value of the battery at each time point from the condition that the energy of the battery is a first preset value, and calculating the energy change value corresponding to each time point according to the voltage value and the current value of the battery at each time point;
the acquiring unit is used for acquiring the temperature of the battery in a target time period and calculating the capacity change value of the battery in the target time period if the sum of the energy change values corresponding to all time points in the target time period reaches a target change value, wherein the energy of the battery in the target time period changes from the first preset value to a second preset value, and the target change value is the difference value between the first preset value and the second preset value.
Optionally, the determining module includes:
a second calculation unit for calculating a proportionality coefficient according to an energy variation value of the battery, a capacity variation value of the battery, and a temperature of the battery;
a determination unit configured to determine the remaining energy of the battery based on a preset mapping relationship, the scaling factor, and the temperature of the battery, wherein the preset mapping relationship includes a mapping relationship between the remaining energy of the battery, the scaling factor, and the temperature of the battery.
Optionally, the apparatus for determining remaining battery energy further includes:
the calculation module is used for calculating a difference value between a preset total energy value and an actual total energy change value if the battery finishes full charge or full discharge, wherein the actual total energy change value is the sum of the energy change values of the battery in the process of full charge or full discharge;
and the updating module is used for updating the proportionality coefficient in the preset mapping relation to a first proportionality coefficient if the difference value between the preset total energy value and the actual total energy change value is larger than a preset value, wherein the first proportionality coefficient is a proportionality coefficient obtained by calculation in the full charge or full discharge process of the battery.
Optionally, the first ratio coefficient includes a plurality of first ratio example coefficients sequentially obtained in a full charge or full discharge process, and a plurality of second ratio example coefficients obtained by a linear difference algorithm between two adjacent first ratio example coefficients obtained.
Optionally, the change energy value of the corresponding battery between the two adjacent obtained first ratio example coefficients is 4-10% of the actual total energy change value.
Optionally, the preset mapping relationship is a mapping relationship that the residual energy, the proportionality coefficient and the temperature of the battery are obtained for the battery in advance, and the mapping relationship is generated according to the obtained residual energy, the proportionality coefficient and the temperature of the battery.
In order to solve the above problem, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the battery remaining energy determining method as described above when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the battery remaining energy determining method as described above.
In the embodiment of the invention, in the process of changing the energy of a battery from a first preset value to a second preset value, a capacity change value of the battery and the temperature of the battery are acquired; and determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference between the first preset value and the second preset value. Therefore, the method directly determines the residual energy of the battery according to the energy change of the battery, can eliminate errors caused by non-energy factors, and improves the accuracy of the determined residual energy of the battery.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a battery remaining energy determination method according to an embodiment of the present invention;
fig. 2 is a flowchart of a battery remaining energy determination method according to another embodiment of the present invention;
FIG. 3 is a diagram illustrating a relationship between a proportionality coefficient and a remaining energy, respectively, and a state of charge of a battery during a change in energy of the battery;
fig. 4 is a schematic structural diagram of a battery remaining energy determination apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery remaining energy determination apparatus according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a battery remaining energy determination apparatus according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a battery remaining energy determination apparatus according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for determining remaining battery energy according to an embodiment of the present invention, as shown in fig. 1, including the following steps:
step 101: acquiring a capacity change value of a battery and the temperature of the battery in the process of changing the energy of the battery from a first preset value to a second preset value;
the reason for the energy change of the battery may be energy increase caused by charging of the battery, and the first preset value is smaller than the second preset value; or the energy reduction caused by the battery discharge, wherein the first preset value is larger than the second preset value. The capacity of the battery is also changed in synchronization with the change in the energy of the battery.
The Battery may include a Battery Management System (BMS), and in the Battery power supply process, the BMS may collect a plurality of parameters of the Battery, for example: current information (charging current information or discharging current information), voltage information (charging voltage information or discharging voltage information), charge amount, discharge amount, battery temperature information, and the like. The energy change of the battery can be calculated through parameters collected by the BMS, and then the process of changing the energy of the battery from a first preset value to a second preset value and the capacity change value of the battery in the process are determined.
The remaining energy of the battery may be determined several times during the process of changing the energy of the battery, and the time for completing the remaining energy of the battery at the previous time may also be the starting time for determining the remaining energy of the battery at the next time, that is, the second preset value determined at the previous time may be used as the first preset value determined at the next time. The smaller the difference between the first preset value and the second preset value, the more and more accurately the number of times the remaining energy of the battery is determined during a single charge-discharge, but the greater the power consumption.
When the difference between the first preset value and the second preset value is small, the time in the process of changing the energy of the battery from the first preset value to the second preset value is short, and the temperature difference of the battery at each time point in the process is small. When the difference between the first preset value and the second preset value is large, the time in the process of changing the energy of the battery from the first preset value to the second preset value is long, and the temperature difference of the battery at different time points in the process is possibly large.
Step 102: and determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference between the first preset value and the second preset value.
After the energy change value of the battery, the capacity change value of the battery and the temperature of the battery are obtained, the residual energy of the battery can be calculated and determined according to a formula; the energy change value of the battery, the capacity change value of the battery, the temperature of the battery and the residual energy of the battery can also be recorded in the testing process before the battery is assembled, so that the relationship among the energy change value of the battery, the capacity change value of the battery, the temperature of the battery and the residual energy of the battery is further obtained, and the energy change value of the battery, the capacity change value of the battery and the temperature of the battery are obtained by acquiring various parameters acquired by the BMS in the change process of the energy of the battery to determine the residual energy of the battery. In other embodiments of the present invention, the remaining energy of the battery may be determined in other manners according to the energy change value of the battery, the capacity change value of the battery, and the temperature of the battery, which are merely examples and should not be construed as limitations on the manner of determining the remaining energy of the battery.
Compared with the mode of simply relying on table lookup and real-time estimation in the prior art, the method can avoid a large number of experiments of the battery in different states, reduce the amount of parameters which need to be relied on in the SOE calculation process, save the time consumed by a large number of experiments, and improve the SOE calculation efficiency.
In the embodiment of the invention, in the process of changing the energy of a battery from a first preset value to a second preset value, a capacity change value of the battery and the temperature of the battery are acquired; and determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference between the first preset value and the second preset value. Therefore, the method directly determines the residual energy of the battery according to the energy change of the battery, can eliminate errors caused by non-energy factors, and improves the accuracy of the determined residual energy of the battery.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for determining remaining battery energy according to another embodiment of the present invention. In the embodiment shown in fig. 2, the remaining energy of the battery is determined based on a combination of the energy variation value of the battery, the capacity variation value of the battery, and the temperature of the battery and a mapping relationship. As shown in fig. 2, the method comprises the following steps:
step 201: and acquiring a capacity change value of the battery and the temperature of the battery in the process of changing the energy of the battery from a first preset value to a second preset value.
The implementation process and beneficial effects of step 201 may be referred to the description in step 101, and are not described herein again.
In an optional embodiment, in the process of acquiring the change value of the energy of the battery from the first preset value to the second preset value, the step of acquiring the change value of the capacity of the battery and the temperature of the battery includes:
sequentially acquiring the voltage value and the current value of the battery at each time point from the condition that the energy of the battery is a first preset value, and calculating the energy change value corresponding to each time point according to the voltage value and the current value of the battery at each time point;
if the sum of the energy change values corresponding to all time points in a target time period reaches a target change value, acquiring the temperature of the battery in the target time period, and calculating the capacity change value of the battery in the target time period, wherein the energy of the battery in the target time period is changed from the first preset value to a second preset value, and the target change value is the difference value between the first preset value and the second preset value.
The product of the current value and the voltage value at a time point is the energy change value of the battery at the time point, specifically, the product of the charging current and the charging voltage of the battery at a first time point is the energy increased by the battery at the first time point when the battery is in a charging state; when the battery is in a discharging state, the product of the discharging current and the discharging voltage of the battery at the second time point is the energy reduced by the battery at the second time point.
Similarly, the current value at a time point is the capacity change value of the battery at the time point, specifically, when the battery is in a charging state, the charging current of the battery at a first time point is the increased capacity of the battery at the first time point; when the battery is in a discharging state, the discharging current of the battery at the second time point is the capacity of the battery reduced at the second time point.
The change condition of the battery can be known by acquiring the voltage value and the current value of the battery at each time point after the energy of the battery is the first preset value, the energy change values of the battery at a certain time point in a certain time period after the energy of the battery is the first preset value are accumulated to obtain the energy change value of the battery at the certain time point, and if the energy change value of the battery at the certain time point after the energy of the battery is the first preset value is equal to the target change value, the certain time period can be determined as the target time period when the energy of the battery is changed from the first preset value to the second preset value.
After the target time period is determined, the capacity change value of the battery in the target time period can be obtained by accumulating the current values corresponding to all the time points in the target time period.
In the embodiment, the energy change value of the battery at each time point is determined by acquiring the current value and the voltage value of the battery at each time point, and then the energy change value of the battery for a period of time is determined; determining the capacity change value of the battery at each time point according to the current value at each time point, and further determining the capacity change value of the battery for a period of time; the accuracy of the obtained energy change value and the capacity change value can be improved, and the accuracy of the residual energy determined based on the energy change value and the capacity change value is further improved.
Note that this embodiment is similarly applicable to the example shown in fig. 1, and can have the same operation and effect.
Step 202: calculating a proportionality coefficient according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery;
in this embodiment, the proportionality coefficient K is the product of the energy variation value Δ EH of the battery divided by the capacity variation value Δ AH of the battery and the temperature T of the battery, i.e., K ═ Δ EH/(Δ AH × T). Because the characteristics of different batteries are not completely the same, the characteristics of the batteries can be better embodied through the proportionality coefficient, and the accuracy of the determined residual energy of the batteries can be improved by determining the residual energy of the batteries through the proportionality coefficient.
Step 203: determining the remaining energy of the battery based on a preset mapping relation, the scaling factor and the temperature of the battery, wherein the preset mapping relation comprises a mapping relation among the remaining energy of the battery, the scaling factor and the temperature of the battery.
After the temperature of the battery is determined in step 201 and the scaling factor is determined in step 202, the temperature can be used as an input parameter to determine the remaining energy of the battery directly through a preset mapping relation
The same value of the proportionality coefficient in the preset map may correspond to one or more combinations of the temperature of the battery and the remaining energy of the battery, but one combination of the temperature of the battery and the remaining energy of the battery corresponds to only one proportionality coefficient. I.e. at a temperature of the battery of T1And the remaining energy of the battery is SOE1Temperature of the battery is T2And the remaining energy of the battery is SOE2And the temperature of the battery is T3And the remaining energy of the battery is SOE3These three combinations can correspond to K1、K2And K3Or the corresponding proportionality coefficients are all K1(ii) a However, each SOEiAnd TjCorresponds to only one Kij。
It should be noted that the preset mapping relationship may be obtained by an operator through empirical summary of the relationship between the temperature and the proportionality coefficient of the battery and the remaining energy of the battery; or, in order to reduce the calculation amount in the working process, a plurality of proportionality coefficients are obtained by calculating various combinations of the temperature and the residual energy of the battery as input through a calculation formula in advance, and a mapping relation is directly established between the various combinations of the temperature and the residual energy of the battery and the plurality of proportionality coefficients; the remaining energy, the scaling factor, and the temperature of the battery may be acquired for the battery in advance before the battery is assembled, and the mapping relationship may be generated according to the acquired remaining energy, the scaling factor, and the temperature of the battery.
The following description will be made in detail by taking, as an example, a mapping relationship obtained by obtaining the remaining energy, the scaling factor, and the temperature of the battery for the battery in advance and generating the remaining energy, the scaling factor, and the temperature of the battery according to the obtained remaining energy, the scaling factor, and the temperature of the battery:
taking the normal temperature working condition as an example: counting the change value delta AH of the capacity in the process of reducing the target change value when the battery is fully discharged at normal temperature1NAnd battery temperature T1Calculating the proportional coefficient K corresponding to each process1NFor example, if the target variation is 5% of the total energy, K is1NTotal energy of discharge/(Δ AH) 5%1N*T1) Total energy of discharging at normal temperature
And counting the change value delta AH of the capacity in the process of increasing the target change value when the battery is fully charged at normal temperature2NAnd battery temperature T2Calculating the proportional coefficient K corresponding to each process2NTotal energy charged/(Δ AH) 5%2N*T2) Total energy charged at normal temperature
Wherein eta is1＝(EConstant discharge assembly/ECharging assembly). Of course, the target variation value may be 3%, 10%, etc., and the number of times is merely illustrative and should not be considered as a limitation of the target variation value.
In addition, since the change of the energy of the battery is accompanied by the change of the state of charge of the battery in synchronization, the relationship between the proportionality coefficient and the remaining energy, respectively, and the state of charge of the battery can be obtained during the test, as shown in fig. 3, in which the abscissa in the upper graph of fig. 3 is the state of charge of the battery and the ordinate is the proportionality coefficient, and in the lower graph of fig. 3, the abscissa is the state of charge of the battery and the ordinate is the remaining energy.
So that the relationship among the remaining energy of the battery, the temperature of the battery, and the proportionality coefficient can be obtained in the same state of charge.
If the various temperature working conditions are tested, the relationship among the residual energy of various batteries, the temperature of the batteries and the proportionality coefficient can be obtained, and thus the mapping relationship generated by the residual energy of the batteries, the proportionality coefficient and the temperature of the batteries is obtained, as shown in table 1. Of course, a small number of temperature conditions can be tested, and the relationship among the residual energy of the battery, the temperature of the battery and the proportionality coefficient of the temperature conditions among several groups of temperature conditions can be obtained by combining a difference algorithm, so that the mapping relationship generated by the residual energy of the battery, the proportionality coefficient and the temperature of the battery can be obtained.
Table 1: mapping relation among temperature, proportionality coefficient and residual energy of battery
The mode can cover the charging and discharging working condition and the using temperature range of the battery, and improves the comprehensiveness of determining the residual energy of the battery.
Optionally, the method for determining remaining battery energy further includes:
if the battery finishes full charge or full discharge, calculating a difference value between a preset total energy value and an actual total energy change value, wherein the actual total energy change value is the sum of the energy change values of the battery in the process of full charge or full discharge of the battery;
if the difference value between the preset total energy value and the actual total energy change value is larger than a preset value, updating the proportionality coefficient in the preset mapping relation to be a first proportionality coefficient, wherein the first proportionality coefficient is obtained by calculation in the full-charge or full-discharge process of the battery.
The battery gradually ages during use, and the available energy decreases. And because the actual total energy change value of the battery cannot be known in the non-full charge and non-full discharge work, the current actual total energy change value of the battery can be known only through the full charge and full discharge operation.
And when the battery is fully charged or fully discharged, the sum of the energy change values of the battery at all time points in the fully charged or fully discharged process is the actual total energy change value of the battery. And judging whether the difference value between the actual total energy change value of the battery and the preset total energy value corresponding to the current preset mapping relation is greater than a preset value or not, if the difference value is not greater than the preset value, the current preset mapping relation is considered to be suitable for the current battery, and if the difference value is greater than the preset value, the current preset mapping relation is considered to be unsuitable for the current battery.
Therefore, when the difference is larger than the preset value, the previous mapping relation is updated by taking the relation among the proportionality coefficient in full charge or full discharge, the temperature of the battery and the residual energy value as a new mapping relation. Specifically, the new scaling factors calculated in step 201 during the full charge or full discharge process are replaced with the scaling factors in the previous mapping relationship according to the corresponding remaining energy and the temperature of the battery.
The first ratio coefficient comprises a plurality of first ratio example coefficients acquired in sequence in a full charge or full discharge process, and a plurality of second ratio example coefficients acquired between two adjacent first ratio example coefficients through a linear difference algorithm.
That is, during the full charge or the full discharge, the scaling sub-number of each time point is not acquired, but only the first scaling coefficients of a plurality (preset number) of time points are acquired in time sequence, and the time point between two temporally adjacent first scaling coefficients is calculated by a linear difference algorithm, so that the calculation amount for obtaining the first scaling coefficients is reduced, and the calculation speed of the first scaling coefficients is increased.
Further, the change energy value of the corresponding battery between the two adjacent obtained first ratio example coefficients is 4-10% of the actual total energy change value.
The smaller the corresponding change energy value between two adjacent first ratio example coefficients is, the more the number of the first ratio example coefficients is, the higher the precision of the first ratio coefficient is, and the larger the calculation amount is; the larger the corresponding change energy value between two adjacent first ratio example coefficients is, the smaller the number of the first ratio example coefficients is, and the lower the accuracy of the first ratio coefficient is, and the smaller the calculation amount is.
When the corresponding change energy value between two adjacent first comparison example coefficients is determined to be 4-10% of the total energy value through experiments, the calculation amount can be kept low under the condition of ensuring the accuracy. Preferably, the corresponding variation energy value between two adjacent first ratio example coefficients is 5% of the total energy value.
The aging degree of the battery can be judged by comparing the actual total energy change value with the preset total energy value in the full charging or full discharging process, the preset mapping relation is updated when the aging degree of the battery is large, the preset mapping relation which is suitable for the aging degree of the battery is obtained, and the accuracy of subsequently determining the residual energy of the battery is improved.
In the embodiment shown in fig. 2, the proportional coefficient is calculated by the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, the remaining energy of the battery is determined directly by the mapping relation among the proportional coefficient, the temperature of the battery and the remaining energy of the battery, the calculation amount is small, and the determination efficiency of the remaining energy is improved.
Referring to fig. 4, fig. 4 is a structural diagram of a remaining battery energy determining apparatus according to an embodiment of the present invention, and as shown in fig. 4, the remaining battery energy determining apparatus 400 includes an obtaining module 401 and a determining module 402;
an obtaining module 401, configured to obtain a capacity change value of a battery and a temperature of the battery in a process that energy of the battery changes from a first preset value to a second preset value;
a determining module 404, configured to determine remaining energy of the battery according to the energy variation value of the battery, the capacity variation value of the battery, and the temperature of the battery, where the energy variation value of the battery is a difference between the first preset value and the second preset value.
Optionally, referring to fig. 5, the obtaining module 401 includes:
the first calculating unit 4011 is configured to sequentially obtain voltage values and current values of the batteries at various time points from when the energy of the batteries is a first preset value, and calculate energy change values corresponding to the various time points according to the voltage values and the current values of the batteries at the various time points respectively;
the obtaining unit 4012 is configured to, if a sum of energy change values corresponding to all time points in a target time period reaches a target change value, obtain a temperature of the battery in the target time period, and calculate a capacity change value of the battery in the target time period, where the energy of the battery in the target time period changes from the first preset value to a second preset value, and the target change value is a difference between the first preset value and the second preset value.
Optionally, referring to fig. 6, the determining module 402 includes:
a second calculation unit 4021 for calculating a proportionality coefficient based on an energy change value of the battery, a capacity change value of the battery, and a temperature of the battery;
a determining unit 4022, configured to determine the remaining energy of the battery based on a preset mapping relationship, the proportional coefficient, and the temperature of the battery, where the preset mapping relationship includes a mapping relationship between the remaining energy of the battery, the proportional coefficient, and the temperature of the battery.
Optionally, the apparatus 400 for determining remaining battery power further includes:
a calculating module 403, configured to calculate a difference between a preset total energy value and an actual total energy change value if the battery completes full charge or full discharge, where the actual total energy change value is a sum of energy change values of the battery during the full charge or full discharge of the battery;
an updating module 404, configured to update a scaling factor in the preset mapping relationship to a first scaling factor if a difference between the preset total energy value and the actual total energy change value is greater than a preset value, where the first scaling factor is a scaling factor calculated in a full charge or full discharge process of the battery.
Optionally, the first ratio coefficient includes a plurality of first ratio example coefficients sequentially obtained in a full charge or full discharge process, and a plurality of second ratio example coefficients obtained by a linear difference algorithm between two adjacent first ratio example coefficients obtained.
Optionally, the change energy value of the corresponding battery between the two adjacent obtained first ratio example coefficients is 4-10% of the actual total energy change value.
Optionally, the preset mapping relationship is a mapping relationship that the residual energy, the proportionality coefficient and the temperature of the battery are obtained for the battery in advance, and the mapping relationship is generated according to the obtained residual energy, the proportionality coefficient and the temperature of the battery.
The battery power determining apparatus 400 can implement each process implemented by the battery remaining energy determining apparatus in the method embodiments of fig. 1 and fig. 3, and is not described herein again to avoid repetition.
In the embodiment of the present invention, the apparatus 400 for determining remaining battery energy may be applied to any device that needs to be powered by a battery, for example: an electric car, a mobile phone, a tablet computer, or a wearable device, etc.
In the battery remaining energy determining apparatus 400 according to the embodiment of the present invention, a capacity change value of a battery and a temperature of the battery are obtained in a process in which energy of the battery changes from a first preset value to a second preset value; and determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference between the first preset value and the second preset value. Therefore, the method directly determines the residual energy of the battery according to the energy change of the battery, can eliminate errors caused by non-energy factors, and improves the accuracy of the determined residual energy of the battery.
An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein:
the processor is used for acquiring a capacity change value of the battery and the temperature of the battery in the process that the energy of the battery is changed from a first preset value to a second preset value; and determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference between the first preset value and the second preset value.
Optionally, the processor is further configured to sequentially obtain a voltage value and a current value of the battery at each time point from the time when the energy of the battery is a first preset value, and calculate an energy change value corresponding to each time point according to the voltage value and the current value of the battery at each time point; if the sum of the energy change values corresponding to all time points in a target time period reaches a target change value, acquiring the temperature of the battery in the target time period, and calculating the capacity change value of the battery in the target time period, wherein the energy of the battery in the target time period changes from the first preset value to a second preset value, and the target change value is the difference value between the first preset value and the second preset value.
Optionally, the processor is further configured to calculate a scaling factor according to the energy variation value of the battery, the capacity variation value of the battery, and the temperature of the battery; determining the remaining energy of the battery based on a preset mapping relation, the scaling factor and the temperature of the battery, wherein the preset mapping relation comprises a mapping relation among the remaining energy of the battery, the scaling factor and the temperature of the battery.
Optionally, the processor is further configured to calculate a difference between a preset total energy value and an actual total energy change value if the battery completes full charge or full discharge, where the actual total energy change value is a sum of energy change values of the battery during the full charge or full discharge of the battery;
if the difference value between the preset total energy value and the actual total energy change value is larger than a preset value, updating the proportionality coefficient in the preset mapping relation to be a first proportionality coefficient, wherein the first proportionality coefficient is obtained by calculation in the full-charge or full-discharge process of the battery.
Optionally, the first ratio coefficient includes a plurality of first ratio example coefficients sequentially obtained in a full charge or full discharge process, and a plurality of second ratio example coefficients obtained by a linear difference algorithm between two adjacent first ratio example coefficients obtained.
Optionally, the change energy value of the corresponding battery between the two adjacent obtained first ratio example coefficients is 4-10% of the actual total energy change value.
Optionally, the preset mapping relationship is a mapping relationship that the residual energy, the proportionality coefficient and the temperature of the battery are obtained for the battery in advance, and the mapping relationship is generated according to the obtained residual energy, the proportionality coefficient and the temperature of the battery.
An embodiment of the present invention further provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements each process of the above-mentioned method for determining remaining battery energy, and can achieve the same technical effect, and is not described herein again to avoid repetition.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned method for determining remaining battery energy, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (14)
1. A battery remaining energy determination method, characterized in that the method comprises:
acquiring a capacity change value of a battery and the temperature of the battery in the process of changing the energy of the battery from a first preset value to a second preset value;
determining the remaining energy of the battery according to the energy change value of the battery, the capacity change value of the battery, and the temperature of the battery, including: calculating a proportionality coefficient K according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the proportionality coefficient K is the product of the energy change value delta EH of the battery divided by the capacity change value delta AH of the battery and the temperature T of the battery; determining the residual energy of the battery based on a preset mapping relation, the proportionality coefficient and the temperature of the battery, wherein the preset mapping relation comprises a mapping relation among the residual energy of the battery, the proportionality coefficient and the temperature of the battery;
the energy change value of the battery is the difference value between the first preset value and the second preset value.
2. The method of claim 1, wherein the step of obtaining the capacity change value of the battery and the temperature of the battery during the process of changing the energy of the battery from the first preset value to the second preset value comprises:
sequentially acquiring the voltage value and the current value of the battery at each time point from the condition that the energy of the battery is a first preset value, and calculating the energy change value corresponding to each time point according to the voltage value and the current value of the battery at each time point;
if the sum of the energy change values corresponding to all time points in a target time period reaches a target change value, acquiring the temperature of the battery in the target time period, and calculating the capacity change value of the battery in the target time period, wherein the energy of the battery in the target time period changes from the first preset value to a second preset value, and the target change value is the difference value between the first preset value and the second preset value.
3. The method of claim 1, further comprising:
if the battery finishes full charge or full discharge, calculating a difference value between a preset total energy value and an actual total energy change value, wherein the actual total energy change value is the sum of the energy change values of the battery in the process of full charge or full discharge of the battery;
if the difference value between the preset total energy value and the actual total energy change value is larger than a preset value, updating the proportionality coefficient in the preset mapping relation to be a first proportionality coefficient, wherein the first proportionality coefficient is obtained by calculation in the full-charge or full-discharge process of the battery.
4. The method according to claim 3, wherein the first scaling factor includes a plurality of first scaling factors sequentially obtained during full charge or full discharge, and a plurality of second scaling factors obtained by a linear difference algorithm between two of the first scaling factors obtained adjacently.
5. The method according to claim 4, wherein the change energy value of the corresponding battery between the two first scale coefficients obtained adjacently is 4-10% of the actual total energy change value.
6. The method according to claim 1, wherein the preset mapping relationship is a mapping relationship which is obtained in advance for the battery by obtaining the battery residual energy, the proportionality coefficient and the battery temperature, and is generated according to the obtained battery residual energy, the proportionality coefficient and the battery temperature.
7. A battery remaining energy determination apparatus, characterized by comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a capacity change value of a battery and the temperature of the battery in the process that the energy of the battery is changed from a first preset value to a second preset value;
the determining module is used for determining the residual energy of the battery according to the energy change value of the battery, the capacity change value of the battery and the temperature of the battery, wherein the energy change value of the battery is the difference value between the first preset value and the second preset value;
the determining module includes:
a second calculation unit for calculating a proportionality coefficient K that is a product of an energy change value Δ EH of the battery divided by a capacity change value Δ AH of the battery and a temperature T of the battery, based on the energy change value of the battery, the capacity change value of the battery, and the temperature T of the battery;
a determination unit configured to determine the remaining energy of the battery based on a preset mapping relationship, the scaling factor, and the temperature of the battery, wherein the preset mapping relationship includes a mapping relationship between the remaining energy of the battery, the scaling factor, and the temperature of the battery.
8. The battery remaining energy determination device according to claim 7, wherein the acquisition module includes:
the first calculating unit is used for sequentially acquiring the voltage value and the current value of the battery at each time point from the condition that the energy of the battery is a first preset value, and calculating the energy change value corresponding to each time point according to the voltage value and the current value of the battery at each time point;
the acquiring unit is used for acquiring the temperature of the battery in a target time period and calculating the capacity change value of the battery in the target time period if the sum of the energy change values corresponding to all time points in the target time period reaches a target change value, wherein the energy of the battery in the target time period changes from the first preset value to a second preset value, and the target change value is the difference value between the first preset value and the second preset value.
9. The battery remaining energy determination apparatus according to claim 7, further comprising:
the calculation module is used for calculating a difference value between a preset total energy value and an actual total energy change value if the battery finishes full charge or full discharge, wherein the actual total energy change value is the sum of the energy change values of the battery in the process of full charge or full discharge;
and the updating module is used for updating the proportionality coefficient in the preset mapping relation to a first proportionality coefficient if the difference value between the preset total energy value and the actual total energy change value is larger than a preset value, wherein the first proportionality coefficient is a proportionality coefficient obtained by calculation in the full charge or full discharge process of the battery.
10. The battery remaining energy determination apparatus according to claim 9, characterized in that the first scaling factor includes a plurality of first scaling factors that are sequentially obtained during full charge or full discharge, and a plurality of second scaling factors that are obtained by a linear difference algorithm between two of the first scaling factors that are obtained adjacently.
11. The battery remaining energy determination apparatus according to claim 10, wherein the change energy value of the battery corresponding to between two of the first ratio example coefficients obtained adjacently is 4 to 10% of the actual total value of the energy change.
12. The battery remaining energy determination device according to claim 7, wherein the preset mapping relationship is a mapping relationship that is obtained in advance for the battery by obtaining a battery remaining energy, a proportionality coefficient, and a battery temperature, and is generated from the obtained battery remaining energy, the proportionality coefficient, and the battery temperature.
13. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the battery residual energy determination method according to any one of claims 1 to 6 when executing the computer program.
14. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the battery residual energy determination method according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910212869.5A CN110133515B (en) | 2019-03-20 | 2019-03-20 | Method and device for determining remaining energy of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910212869.5A CN110133515B (en) | 2019-03-20 | 2019-03-20 | Method and device for determining remaining energy of battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110133515A CN110133515A (en) | 2019-08-16 |
| CN110133515B true CN110133515B (en) | 2021-10-29 |
Family
ID=67568556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910212869.5A Active CN110133515B (en) | 2019-03-20 | 2019-03-20 | Method and device for determining remaining energy of battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110133515B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112585487A (en) * | 2019-11-29 | 2021-03-30 | 深圳市大疆创新科技有限公司 | Battery life detection method, battery, electronic device, and storage medium |
| CN112818535B (en) * | 2021-01-28 | 2024-01-02 | 北京车和家信息技术有限公司 | Method and device for establishing electrothermal simulation model and obtaining electrothermal simulation value |
| CN113608132B (en) * | 2021-08-02 | 2024-02-27 | 北京芯虹科技有限责任公司 | Method, system and storage medium for determining residual capacity of lithium ion battery |
| CN114089197A (en) * | 2021-11-11 | 2022-02-25 | 珠海格力电器股份有限公司 | Door lock monitoring method and device, electronic equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320079A (en) * | 2008-06-25 | 2008-12-10 | 哈尔滨工业大学 | Computing method for battery electric quantity state |
| JP2011220695A (en) * | 2010-02-10 | 2011-11-04 | Ministry Of National Defense Chung Shan Inst Of Science & Technology | State detection method of battery module |
| CN104076283A (en) * | 2013-03-25 | 2014-10-01 | 北汽福田汽车股份有限公司 | Power battery SOC initial value calculation method and power battery system |
| CN105738822A (en) * | 2016-02-14 | 2016-07-06 | 深圳合金力量科技有限公司 | Device and method of estimating battery residual electric quantity |
| CN107037366A (en) * | 2016-12-02 | 2017-08-11 | 江苏富威能源有限公司 | A kind of electric rail car lithium ion battery control system |
-
2019
- 2019-03-20 CN CN201910212869.5A patent/CN110133515B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101320079A (en) * | 2008-06-25 | 2008-12-10 | 哈尔滨工业大学 | Computing method for battery electric quantity state |
| JP2011220695A (en) * | 2010-02-10 | 2011-11-04 | Ministry Of National Defense Chung Shan Inst Of Science & Technology | State detection method of battery module |
| CN104076283A (en) * | 2013-03-25 | 2014-10-01 | 北汽福田汽车股份有限公司 | Power battery SOC initial value calculation method and power battery system |
| CN105738822A (en) * | 2016-02-14 | 2016-07-06 | 深圳合金力量科技有限公司 | Device and method of estimating battery residual electric quantity |
| CN107037366A (en) * | 2016-12-02 | 2017-08-11 | 江苏富威能源有限公司 | A kind of electric rail car lithium ion battery control system |
Non-Patent Citations (1)
| Title |
|---|
| 汪奂伶.基于特性区间的储能磷酸铁锂电池SOE估算方法研究.《中国优秀硕士学位论文全文数据库 工程科技II辑》.2018, * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110133515A (en) | 2019-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110133515B (en) | Method and device for determining remaining energy of battery | |
| He et al. | Online model-based estimation of state-of-charge and open-circuit voltage of lithium-ion batteries in electric vehicles | |
| KR101846690B1 (en) | System and Method for Managing Battery on the basis of required time for Charging | |
| CN102119338B (en) | Apparatus and method for estimating state of health of battery based on battery voltage variation pattern | |
| JP5493657B2 (en) | Storage battery device and battery state evaluation device and method for storage battery | |
| CN107576918B (en) | Method and system for estimating residual electric quantity of lithium battery | |
| WO2020198118A1 (en) | Methods, systems, and devices for estimating and predicting a remaining time to charge and a remaining time to discharge of a battery | |
| JP2017166874A (en) | Storage battery evaluation device, storage battery, storage battery evaluation method, and program | |
| JP2006242880A (en) | Condition detector for power supply device, power supply device, and initial characteristic extractor used for power supply device | |
| WO2012073997A1 (en) | Degradation estimation device for secondary battery | |
| WO2008099298A1 (en) | Method and apparatus for determination of the state-of-charge (soc) of a rechargeable battery | |
| CN111913109B (en) | Method and device for predicting peak power of battery | |
| CN112622693A (en) | Battery management method and device and vehicle | |
| JP2014102111A (en) | State estimation device for battery | |
| CN104051810A (en) | Rapid correction method for SOC (state of charge) estimation of energy storage lithium ion battery system | |
| CN113557439A (en) | Method for estimating state of health of battery | |
| CN113484762A (en) | Battery state of health estimation method, device, equipment and storage medium | |
| CN106093793A (en) | A kind of SOC estimation method based on battery discharge multiplying power and device | |
| CN112433156A (en) | SOC estimation method | |
| JP2018009963A (en) | Simulation method and simulation device | |
| CN116430243A (en) | Estimation method and device of battery cell SOC, server and storage medium | |
| CN113075558B (en) | Battery SOC estimation method, device and system | |
| Meng et al. | A robust battery state-of-charge estimation method for embedded hybrid energy system | |
| JP2016173260A (en) | Battery deterioration determination device, battery pack, battery deterioration determination method and battery deterioration determination program | |
| CN112946498B (en) | Method and device for obtaining electromotive force curve and processor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |