CN112541260A - Battery equalization control method and system, storage medium and electronic equipment - Google Patents
Battery equalization control method and system, storage medium and electronic equipment Download PDFInfo
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Abstract
The invention discloses a battery equalization control method, a battery equalization control system, a storage medium and electronic equipment, and relates to the technical field of battery management systems. The method comprises the following steps: obtaining the average capacitance and the target capacitance of the battery pack according to the capacitance of each battery cell; determining a target battery cell meeting a preset condition as a battery cell to be equalized, wherein the preset condition comprises that a first parameter of the target battery cell is within a preset equalization mark threshold range, and the electric capacity of the target battery cell is greater than the average electric capacity and the target electric capacity; then obtaining the equalization time of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and preset equalization current; and finally, balancing the electric cores to be balanced within the balancing time length. The invention solves the problem that the traditional battery passive equalization scheme is easy to be over-equalized or error-equalized, and realizes the technical effects of improving the energy utilization rate of the battery and prolonging the service life of the battery.
Description
Technical Field
The invention relates to the technical field of battery management systems, in particular to a battery equalization control method, a battery equalization control system, a storage medium and electronic equipment.
Background
The consistency of the manufacturing process of the battery pack when the battery pack leaves a factory is different, and the capacity consistency of the battery pack is also different along with the influence of running time and self-discharge in the using process, so that the battery pack needs to be balanced to ensure the consistency of the whole life cycle of the battery. The current mainstream battery equalization method comprises active equalization and passive equalization, wherein the equalization scheme of the passive equalization comprises voltage equalization and capacity equalization, and the start of the voltage equalization is started in real time through a voltage difference and is closed in real time; the capacity balance is controlled to be opened and closed by the SOC difference.
At present, in the passive equalization control in a power battery system, the average residual capacity of each battery cell in the power battery system is calculated through the residual charging capacity and voltage difference of a battery appearing at the charging end, and the battery cell higher than the average residual capacity in the power battery system is controlled, so that the battery cell with high residual capacity is subjected to dissipation discharge in the next charging and discharging cycle process; the scheme enables the balance time per day to be increased from original several minutes to 8-10 hours, so that the passive balance efficiency is improved, but the scheme is easy to have risks of over balance and error balance, is not beneficial to the stability of the battery, and accordingly reduces the energy utilization rate of the battery.
Therefore, the existing battery passive equalization scheme has the technical problem of over-equalization or misequalization.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The main purposes of the invention are as follows: the invention provides a battery equalization control method, a battery equalization control system, a storage medium and electronic equipment, and aims to solve the technical problem that a passive equalization scheme of a battery in the prior art is easy to cause over-equalization or misequalization.
The technical scheme adopted by the invention is as follows:
in order to achieve the above object, in a first aspect, the present invention provides a battery equalization control method, including the steps of:
acquiring a first parameter and electric capacity of each electric core in the battery pack;
obtaining the minimum capacitance and the average capacitance of the battery pack according to the capacitance of each battery cell;
obtaining a target capacity of the battery pack according to the minimum capacity;
determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset balance mark threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
obtaining the equalization time of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and a preset equalization current;
and balancing the battery cell to be balanced within the balancing time of the battery cell to be balanced.
Optionally, in the above battery balancing control method, the first parameter includes a real-time voltage, a real-time temperature, a real-time current, and a standing time;
the step of determining a target cell meeting a preset condition as a cell to be balanced specifically includes:
judging whether the real-time voltage, the real-time temperature, the real-time current and the standing time of the target battery cell are all within the corresponding preset balance mark threshold range;
when the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core are all within the range of preset marking threshold values, further judging whether the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
and if the electric capacity of the target electric core is larger than the average electric capacity and larger than the target electric capacity, determining the target electric core as the electric core to be equalized.
Optionally, in the above battery balancing control method, after the step of obtaining the balancing time of the to-be-balanced battery cell according to the electric capacity of the to-be-balanced battery cell and a preset balancing current, the method further includes:
and storing the number corresponding to the battery cell to be balanced and the balancing time length of the battery cell to be balanced.
Optionally, in the battery balancing control method, the step of balancing the battery cell to be balanced within the balancing duration of the battery cell to be balanced specifically includes:
and in the process of carrying out balanced discharge on the battery cell to be balanced, if the battery pack is powered off, interrupting the balance, and storing the number corresponding to the battery cell to be balanced and the residual balancing time.
Optionally, in the battery balancing control method, the step of balancing the battery cell to be balanced within the balancing duration of the battery cell to be balanced specifically includes:
judging whether a second parameter of the battery cell to be balanced is within a preset balance execution threshold range according to a stored number corresponding to the battery cell to be balanced;
and if the stored second parameter of the battery cell to be balanced is within a preset balance execution threshold range, balancing the battery cell to be balanced according to the stored residual balance duration of the battery cell to be balanced.
Optionally, in the above battery balancing control method, the second parameter includes a real-time voltage and a real-time temperature;
the step of judging whether the second parameter of the battery cell to be equalized is within a preset equalization execution threshold range according to the stored number corresponding to the battery cell to be equalized specifically includes:
acquiring real-time voltage and real-time temperature of the battery cell to be balanced according to the stored serial number of the battery cell to be balanced;
judging whether the real-time voltage and the real-time temperature of the battery cell to be balanced are both within the corresponding preset balance execution threshold range;
if the stored second parameter of the battery cell to be equalized is within a preset equalization execution threshold range, equalizing the battery cell to be equalized according to the stored remaining equalization duration of the battery cell to be equalized, which specifically includes:
and when the stored real-time voltage and real-time temperature of the battery cell to be equalized are both within the corresponding preset equalization execution threshold range, equalizing the battery cell to be equalized according to the stored residual equalization duration of the battery cell to be equalized.
Optionally, in the battery balancing control method, after the step of balancing the battery cell to be balanced within the balancing duration of the battery cell to be balanced, the method further includes:
and when the balance time length timing is finished, clearing the stored serial numbers corresponding to the battery cores to be balanced, and terminating the balance.
In a second aspect, the present invention provides a battery equalization control system, the system comprising:
the parameter acquisition module is used for acquiring a first parameter of each battery cell in the battery pack;
the electric capacity module is connected with the parameter acquisition module and used for obtaining the electric capacity of each battery cell according to the first parameter of each battery cell and obtaining the minimum electric capacity and the average electric capacity of the battery pack according to the electric capacity of each battery cell;
a target capacitance module connected to the capacitance module for obtaining a target capacitance of the battery pack according to the minimum capacitance;
the balance marking module is connected with the parameter acquisition module and the target capacitance module and is used for determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset balance mark threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
the equalization duration module is connected with the equalization marking module and is used for obtaining the equalization duration of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and preset equalization current;
and the equalization execution module is connected with the equalization time length module and used for equalizing the battery cell to be equalized within the equalization time length of the battery cell to be equalized.
In a third aspect, the present invention provides a storage medium having stored thereon a computer program executable by one or more processors to implement a battery equalization control method as described above.
In a fourth aspect, the present invention provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the computer program executes the battery equalization control method when being executed by the processor.
One or more technical schemes provided by the invention at least have the following advantages or technical effects:
the battery equalization control method, the battery equalization control system, the storage medium and the electronic equipment set by the invention set the target capacitance according to the minimum capacitance of the battery pack, meet the requirement that the first parameter is within the range of the preset equalization mark threshold value, and the target cell with the capacitance larger than the average capacitance and the target capacitance is determined as the cell to be balanced, so as to ensure the uniformity of battery balance, prevent over-balance and error balance, and after the equalization duration of the battery cell to be equalized is obtained according to the electric capacity of the battery cell to be equalized and the preset equalization current, within the equalization duration of the battery cell to be equalized, the battery cores to be balanced are discharged in a balanced mode, so that sufficient balanced electric quantity is guaranteed, consistency differences caused by different battery delivery specifications and different battery service lives are reduced, the energy utilization rate of the battery is improved, and the service life of the battery is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a battery equalization control method according to an embodiment of the present invention;
fig. 2 is another schematic flow chart of a battery equalization control method according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of functional modules of a battery balancing control system according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either internal or interactive relationship, unless expressly defined otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should be considered to be absent and not be within the protection scope of the present invention.
Analysis of the prior art finds that, at present, passive equalization control schemes designed based on ensuring the service life of the battery and ensuring the balance between the inconsistency and the equalization amount of the battery have some problems. For example, in a voltage difference equalization scheme adopted in a battery charging process, when a battery capacity difference and an internal resistance difference are large, due to the limitation of equalization conditions, under the condition that equalization time and equalization current are insufficient, the consistency of a battery pack cannot be ensured, and particularly, the influence at the end of the service life of the battery is more obvious. For another example, capacity equalization control in the power battery system calculates the average residual capacity of each battery cell in the power battery system through the residual charging capacity and voltage difference of the battery appearing at the charging end, and controls the battery cell with the average residual capacity higher than the average residual capacity in the power battery system, so as to perform dissipation discharge on the battery cell with high residual capacity in the next charging and discharging cycle process; this scheme does not take the restriction of balanced capacity to balanced electric current and equilibrium time, the risk of overbalance appears easily, for example certain electric core needs the equilibrium because of the capacity is inconsistent at the initial stage of life, and need the protection because of self discharge is too fast again at the end of life, at this moment, adopt above-mentioned scheme can keep balanced at full life cycle, will appear the risk of misbalancing, will be unfavorable for the stability of battery to lead to the energy utilization of battery to reduce.
In view of the technical problem that a passive battery equalization scheme in the prior art easily causes over-equalization or mis-equalization, the invention provides a battery equalization control method, which has the following general idea:
acquiring a first parameter and electric capacity of each electric core in the battery pack; obtaining the minimum capacitance and the average capacitance of the battery pack according to the capacitance of each battery cell; obtaining a target capacity of the battery pack according to the minimum capacity; determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset balance mark threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity; obtaining the equalization time of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and a preset equalization current; and balancing the battery cell to be balanced within the balancing time of the battery cell to be balanced.
Through the technical scheme, the uniformity of battery equalization and the effectiveness of the battery core to be equalized are guaranteed, the situations of over-equalization and error equalization are effectively prevented from occurring, in addition, the consistency difference caused by different outgoing specifications of the battery and different service lives of the battery is reduced while sufficient equalization electric quantity can be guaranteed, and the energy utilization rate of the battery is improved.
Example one
Referring to fig. 1, fig. 1 is a schematic flow chart of a battery equalization control method according to the present invention, and this embodiment provides a battery equalization control method, which is applied to a power battery system of a new energy vehicle, and is used to control passive equalization in a charging process of a power battery, so as to keep a voltage deviation of a battery pack within an expected range, thereby ensuring that each cell is kept in the same state during normal use, and avoiding occurrence of overcharge and overdischarge.
The following describes in detail a battery equalization control method provided in this embodiment with reference to fig. 1, where the method specifically includes the following steps:
step 101: and acquiring a first parameter and electric capacity of each electric core in the battery pack.
When an automobile using the power battery stops running and needs to be charged, after a user inserts a power line, the battery pack is connected with charging equipment to start charging, the battery pack is powered on, and at the moment, the first parameters and the electric capacity of each battery cell in the battery pack are collected.
Specifically, the battery pack includes a plurality of sets of battery cells connected in series, and a first parameter and a capacitance are collected for each individual battery cell, where the first parameter may be set according to an actual operation requirement of the power battery, for example, in an embodiment, the first parameter of this embodiment may include working parameters such as real-time voltage, real-time temperature, real-time current, and the like, and include a cooling duration or a standing duration of the battery pack, where the standing duration may be a time from when the vehicle stops operating to when the parameter is collected; in another implementation, the first parameter of this embodiment may include working parameters such as real-time voltage, real-time temperature, real-time current, and the like, and include a cooling time period or a standing time period of the battery pack, and may further include detection results such as whether the battery pack has a fault, whether the equalization circuit has a fault, and the like.
The capacity (SOC), i.e. the State of charge, is used to reflect the remaining capacity of the battery, and the capacity cannot be directly measured, but can only be estimated by the parameters of the battery terminal voltage, the charging and discharging current, the internal resistance, etc. Therefore, after the real-time first parameter is obtained, the capacitance of each cell is calculated by adopting the traditional calculation methods such as a discharge test method, an ampere-hour measurement method, a battery internal resistance method, an open-circuit voltage method, a load voltage method and the like, or by adopting the calculation methods such as a Kalman filtering method, a fuzzy logic theory method, a neural network method and the like, and the parameters are selected according to the actual condition of the power battery or according to the set first parameter.
Step 102: and obtaining the minimum capacitance and the average capacitance of the battery pack according to the capacitance of each electric core.
Because the actual capacitance of each cell is not unique and constant and can be reduced or lost along with the use, when the capacitances of all the cells are collected, the minimum capacitance can be obtained, and then the average capacitance of the battery pack is calculated according to the capacitances of all the cells.
Step 103: obtaining a target capacity of the battery pack according to the minimum capacity.
In the specific implementation process, the target capacitance can be specifically set according to the specification of the power battery system, and the original capacitance or the real capacitance of a certain battery cell is not directly used by adopting the reference of the target capacitance, so that the uniformity of battery equalization can be ensured, and excessive equalization of certain battery cells with small capacitance can be prevented.
The target capacitance can be a multiple of the minimum capacitance, or can be set by directly adding a fixed value to the minimum capacitance, and the specific value of the multiple or the added value needs to be set according to the actual condition of the power battery system, for example, the target capacitance can be 1.02 times of the minimum capacitance.
Step 104: determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset equalization flag threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity.
Specifically, a single battery cell is used as a target battery cell, and a preset condition of the target battery cell is judged, that is, whether a first parameter of the target battery cell is within a corresponding preset equalization marking threshold range is judged, wherein the preset equalization marking threshold range is set according to the actual condition of the power battery system, and after the type of the first parameter is determined, an equalization marking threshold range is set for a single parameter in the first parameter; then, whether the capacitance of the target cell meets a preset capacitance condition is judged, that is, the capacitance of the target cell is larger than the average capacitance and larger than the target capacitance.
In one embodiment, the determination of the target cell meeting the preset condition as the cell to be equalized can be realized through the following steps 104.1 to 104.3:
step 104.1: and judging whether the real-time voltage, the real-time temperature, the real-time current and the standing time of the target battery cell are all within the corresponding preset balance mark threshold range.
In the specific implementation process, after determining that the first parameter includes real-time voltage, real-time temperature, real-time current and standing time, and setting a corresponding balance mark threshold range according to the parameters, the determination is performed, wherein the preset balance mark threshold range corresponding to the first parameter is set according to the actual conditions of the power battery system, for example, when the battery pack is a terpolymer lithium battery, the first parameter of the ternary battery cell in the battery pack includes real-time voltage, real-time temperature, real-time current and standing time, correspondingly, the balance mark threshold corresponding to the voltage of the ternary battery cell can be set to 4.0-4.15V, the balance mark threshold corresponding to the temperature of the ternary battery cell can be set to 10-35 ℃, the balance mark threshold corresponding to the current of the ternary battery cell can be set to a rated current ± 3A, and the balance mark threshold corresponding to the standing time of the battery pack can be set to 20min or more than 1h, and judging the above conditions for the target electric core, and entering step 104.2.
Step 104.2: and when the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core are all within the preset marking threshold range, further judging whether the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity.
Specifically, when the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core are all within the preset marking threshold range, further determining whether the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity, and when one of the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core is not within the preset marking threshold range, returning to step 101 to continue to obtain the real-time parameters of the electric core.
And performing condition limitation on the preset equalization mark threshold range corresponding to the first parameter on the target battery cell, so that blind equalization of all battery cells can be prevented, and the situation of error equalization caused by equalization performed on battery cells unsuitable for equalization can be prevented.
In a specific implementation process, the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core are all within a preset marking threshold range, which means that the threshold ranges corresponding to the parameters are simultaneously met, if one of the parameters of a certain target electric core does not meet the threshold range, the target electric core is not suitable for balancing, further judgment is not performed on the target electric core, and then judgment of the preset marking threshold range is performed on the next target electric core, or the step 101 is returned, the real-time parameters of the target electric core are continuously obtained, and further judgment is performed until the target electric core meets the preset standard threshold range.
Specifically, it is further determined whether the capacitance of the target electrical core is greater than the average capacitance and the target capacitance, and if the capacitance of the target electrical core is greater than the average capacitance and less than or equal to the target capacitance, or if the capacitance of the target electrical core is less than or equal to the average capacitance and greater than the target capacitance, it is determined that the capacitance determination condition is not met, and step 104.3 is only executed if the capacitance of the target electrical core is greater than the average capacitance and greater than the target capacitance.
Step 104.3: and if the electric capacity of the target electric core is larger than the average electric capacity and larger than the target electric capacity, determining the target electric core as the electric core to be equalized.
Specifically, when the electric capacity of the target electric core is greater than the average electric capacity and greater than the target electric capacity, the target electric core is determined to be the electric core to be equalized, and the step 105 is entered, otherwise, the step 101 is returned to continue to acquire the real-time parameters of the electric core.
Whether the electric capacity standard set according to the actual electric capacity of the target electric core is met or not is judged according to the actual electric capacity of the target electric core, so that the electric core to be equalized is determined, the real-time accuracy of the electric capacity is ensured, the standard set according to the actual condition is used for preventing the occurrence of the condition of excessive equalization caused by the fact that the electric capacity setting standard is not in accordance with the actual condition under the condition that the actual electric capacity is smaller than the original electric capacity due to the battery loss and the like, and the effectiveness of the electric core to be equalized can be ensured.
In a specific implementation process, the target battery cell is determined as a battery cell to be balanced, that is, the target battery cell is marked to indicate that the target battery cell is a battery cell which really needs balancing, so that the situation of wrong balancing can be prevented. Because the number of the battery cells in the battery pack is large, each single battery cell can be generally numbered, so that the marked target battery cell can be determined to be a battery cell to be balanced by determining the number of the target battery cell, and when balancing is performed subsequently, the battery cells corresponding to the number are directly balanced.
Step 105: and obtaining the balancing time of the battery cell to be balanced according to the electric capacity of the battery cell to be balanced and the preset balancing current.
Specifically, it is long to set for reasonable equilibrium, can guarantee that electric core reaches sufficient balanced electric quantity, can prevent again at whole charging or discharge process, balances electric core always, leads to the condition of excessive equilibrium to take place easily.
In the embodiment, the equalization duration of the to-be-equalized battery cell is set to be the capacitance/preset equalization current of the to-be-equalized battery cell according to the relationship, the equalization duration is a comprehensive index influenced by a hardware circuit and also influenced by the battery consistency requirement, and the reasonable duration can prevent excessive equalization. The preset equalization current is adjusted according to the strategy requirement of the power battery system and the performance of the power battery, correspondingly, the equalization time duration is specifically set for the capacitance of the battery cell to be equalized, the equalization time durations of the battery cells needing equalization in the whole battery pack may be inconsistent, and the battery equalization object and the equalization time duration are more targeted.
Step 106: and balancing the battery cell to be balanced within the balancing time of the battery cell to be balanced.
Specifically, in order to reduce the consistency difference caused by different battery delivery specifications and different battery lives, the battery cell to be balanced, which is determined according to the condition limitation in the above steps, in the battery pack needs to be balanced, the balancing is performed specifically according to the existing hardware in the power battery system, including a passive balancing circuit for performing balancing, the battery cell to be balanced is subjected to balanced discharge along with the decreasing of the balancing duration, and after the balancing duration is over, the balancing is terminated, so that sufficient balanced electric quantity is ensured, the service capacity of the battery is improved, and the service life of the battery is prolonged.
In the battery equalization control method provided by this embodiment, a user can keep an original passive equalization design circuit according to a battery consistency difference, and perform passive equalization control under equalization current and hardware conditions, so that the technical effects of improving the electrical property difference of a single battery cell in a battery pack, improving the service capacity of a battery, and prolonging the service life of the battery are achieved; in addition, the target capacitance is set according to the minimum capacitance, and only the battery cores which are larger than the average capacitance and the target capacitance are balanced, so that excessive balance is effectively avoided, and the energy utilization rate of the battery is improved; finally, the determined electric core to be balanced is subjected to balanced discharge within the balancing time of the electric core to be balanced, so that the consistency difference caused by different battery delivery specifications and different battery lives is reduced while sufficient balanced electric quantity is ensured, the short-term energy maximization of the battery is achieved, the situations of over-balancing and error balancing are prevented, the capacity maximization of the single electric core with the minimum electric capacity in the battery pack can be effectively ensured within the whole life cycle of the battery, and the capacity maximization of the battery pack is realized.
Example two
Based on the same inventive concept, referring to another flow diagram of a battery equalization control method shown in fig. 2, this embodiment further provides a battery equalization control method based on the first embodiment, which specifically includes the following steps:
step 201: and acquiring a first parameter and electric capacity of each electric core in the battery pack.
Specifically, the battery pack is powered on, and first parameters and electric capacity of each electric core in the battery pack are obtained; in one embodiment, the first parameter includes a real-time voltage, a real-time temperature, a real-time current and a standing time of the battery cell;
step 202: and obtaining the minimum capacitance and the average capacitance of the battery pack according to the capacitance of each electric core.
Step 203: obtaining a target capacity of the battery pack according to the minimum capacity.
Step 204: determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset equalization flag threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity.
In one embodiment, the determination of the target cell meeting the preset condition as the cell to be equalized can be realized through the following steps 104.1 to 104.3:
step 204.1: and judging whether the real-time voltage, the real-time temperature, the real-time current and the standing time of the target battery cell are all within the corresponding preset balance mark threshold range.
Step 204.2: and when the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core are all within the preset marking threshold range, further judging whether the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity.
Specifically, when the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core are all within the preset marking threshold range, further determining whether the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity, and when one of the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core is not within the preset marking threshold range, returning to step 201 to continue to obtain the real-time parameters of the electric core;
step 204.3: and if the electric capacity of the target electric core is larger than the average electric capacity and larger than the target electric capacity, determining the target electric core as the electric core to be equalized.
Specifically, when the capacitance of the target electric core is greater than the average capacitance and greater than the target capacitance, determining that the target electric core is the electric core to be equalized, and entering step 205, otherwise, returning to step 201 to continue to obtain the real-time parameters of the electric core;
step 205: and obtaining the balancing time of the battery cell to be balanced according to the electric capacity of the battery cell to be balanced and the preset balancing current.
For further details of the implementation based on steps 201 to 205, reference may be made to the description of the implementation based on steps 101 to 105 in the first embodiment, and for brevity of the description, no further description is given here.
Step 206: storing the number corresponding to the battery cell to be balanced and the balancing time length of the battery cell to be balanced;
specifically, the number corresponding to the cell to be balanced and the balancing duration thereof are stored in a storage device such as a memory or a storage unit based on the power battery system, after the cell to be balanced is determined in step 204, the number corresponding to the cell to be balanced and the balancing duration of the cell to be balanced calculated in step 205 are stored together until the balancing is finished, and the cell to be balanced is cleared when the balancing is exited.
After storing the corresponding serial number of the battery cell to be balanced and the balancing duration thereof, the following steps 207 to 208 can be sequentially executed, so that the battery passive balancing control of a complete charging process with one interruption is realized; or, the steps 207 to 208 may be branches of steps executed independently, so as to implement passive balancing control of batteries with independent battery cores, and when the balancing marks are performed in the steps 201 to 206, the steps 207 to 208 execute balancing on the stored battery cores to be balanced.
Step 207: and balancing the battery cell to be balanced within the balancing time of the battery cell to be balanced.
In an embodiment, the cell to be equalized can be equalized within the equalization duration of the cell to be equalized through the following steps 207.1 to 207.3:
step 207.1: and in the process of carrying out balanced discharge on the battery cell to be balanced, if the battery pack is powered off, interrupting the balance, and storing the number corresponding to the battery cell to be balanced and the residual balancing time.
Specifically, the passive equalization is performed in the charging process of the power battery, when the vehicle is not charged any more, the user pulls the battery pack out of the charging device, the battery pack is powered off, at this time, the equalization is not completed yet, the equalization is interrupted this time, and the number corresponding to the electric core to be equalized and the equalization remaining equalization time of this time are stored, wherein the storage time of the electric core to be equalized, which is stored in the storage device in the step 206, is replaced when the remaining equalization time is stored.
Step 207.2: and judging whether the second parameter of the battery cell to be balanced is within a preset balance execution threshold range according to the stored number corresponding to the battery cell to be balanced.
For example, in an embodiment, the first parameter of this embodiment may be an operating parameter including real-time voltage, real-time temperature, real-time current, and the like, and include a cooling time period or a standing time period of the battery pack, and the corresponding second parameter may include an operating parameter including real-time voltage, real-time temperature, and the like; in another implementation, the first parameter of this embodiment may include working parameters such as real-time voltage, real-time temperature, real-time current, and the like, and include a cooling time length or a standing time length of the battery pack, and may further include detection results such as whether the battery pack has a fault and whether the equalization circuit has a fault, and the corresponding second parameter may include working parameters such as real-time voltage, real-time temperature, and the like, and detection results such as whether the battery pack has a fault and whether the equalization circuit has a fault.
Specifically, in an embodiment, a preset equalization execution threshold range corresponding to the second parameter is set according to the actual condition of the power battery system, so that the determination of some parameters is omitted, for example, it is no longer necessary to determine whether the standing time meets the requirement; meanwhile, the preset equalization execution threshold range of the real-time second parameter is also wider than the preset equalization flag threshold range, for example, in the battery pack in the specific implementation details of step 104.1 of the embodiment, the equalization flag threshold corresponding to the temperature of the ternary battery cell is set to be 10 to 35 ℃, and here, the equalization execution threshold corresponding to the temperature of the ternary battery cell may be set to be 0 to 50 ℃ corresponding to the equalization flag threshold.
In an embodiment, specifically, the determining, according to a stored serial number corresponding to the battery cell to be equalized, whether the second parameter of the battery cell to be equalized is within a preset equalization execution threshold range may include the following steps 207.2.1 to 207.2.2:
step 207.2.1: when the battery pack is electrified again, acquiring the real-time voltage and the real-time temperature of the battery cell to be balanced according to the stored serial number of the battery cell to be balanced;
specifically, in an embodiment, the second parameter includes two parameters, namely real-time voltage and real-time temperature, when the user connects the battery pack to the charging device again and starts charging, the battery pack is powered on again, first, the number corresponding to the battery cell to be equalized, which is stored in the storage device, is called, and according to the stored number of the battery cell to be equalized, the real-time voltage and the real-time temperature of the corresponding battery cell to be equalized are obtained;
when the battery pack is electrified again, the equalization can be continued according to the stored information without re-determining the battery cell to be equalized, so that the integrity of the equalization can be ensured, the step of re-determining the battery cell to be equalized can be reduced, and the equalization efficiency of the battery is improved;
step 207.2.2: judging whether the real-time voltage and the real-time temperature of the battery cell to be balanced are both within the corresponding preset balance execution threshold range;
in a specific implementation process, the determination is performed only after the second parameter is determined to include the real-time voltage and the real-time temperature, and the corresponding equalization execution threshold range is set according to the parameters, wherein the manner of setting the content of the second parameter and the equalization execution threshold range corresponding to the second parameter may be set by a user, or may be set by a manufacturer before the automobile leaves a factory.
Step 207.3: and if the stored second parameter of the battery cell to be balanced is within a preset balance execution threshold range, balancing the battery cell to be balanced according to the stored residual balance duration of the battery cell to be balanced.
Specifically, when the stored real-time voltage and the stored real-time temperature of the battery cell to be equalized are both within the corresponding preset equalization execution threshold range, the battery cell to be equalized is equalized according to the remaining equalization duration of the stored battery cell to be equalized, and when one of the stored real-time voltage and the stored real-time temperature of the battery cell to be equalized is not within the preset equalization execution threshold range, the step 201 is returned to obtain the real-time parameter of the battery cell again.
Step 208: and when the balance time length timing is finished, clearing the stored serial numbers corresponding to the battery cores to be balanced, and terminating the balance.
Specifically, according to existing hardware in the power battery system, the balance is performed by a passive balance circuit including balance execution, the battery cell to be balanced is subjected to balance discharge along with the gradual decrease of the balance duration, and after the balance duration is over, the balance is stopped, so that sufficient balance electric quantity can be ensured, the service capacity of the battery is improved, and the service life of the battery is prolonged.
In the battery equalization control method provided by the embodiment, the steps of storing the number of the battery cell to be equalized and the equalization time length are added, and when the battery pack is powered off, the number of the battery cell to be equalized and the remaining equalization time length are stored again, when the battery pack is powered on again, equalization can be continued according to the stored information, and the battery cell to be equalized does not need to be determined again; meanwhile, after the battery pack is electrified again, the stored second parameter of the battery cell to be balanced is obtained, whether the second parameter is within the preset balance execution threshold value range or not is judged, the balance can be guaranteed not to affect the normal discharge of the battery, and the working efficiency of the power battery system is improved.
EXAMPLE III
Based on the same inventive concept, referring to a functional module schematic diagram of a battery equalization control system shown in fig. 3, the present embodiment provides a battery equalization control system, where the system is connected to a power battery system, and performs passive equalization on a charging process of a battery pack in the power battery system, and the system includes:
the parameter acquisition module is used for acquiring a first parameter of each battery cell in the battery pack;
the electric capacity module is connected with the parameter acquisition module and used for obtaining the electric capacity of each battery cell according to the first parameter of each battery cell and obtaining the minimum electric capacity and the average electric capacity of the battery pack according to the electric capacity of each battery cell;
a target capacitance module connected to the capacitance module for obtaining a target capacitance of the battery pack according to the minimum capacitance;
the balance marking module is connected with the parameter acquisition module and the target capacitance module, and is used for determining a target battery cell meeting preset conditions as a battery cell to be balanced and outputting information corresponding to the battery cell to be balanced, wherein the preset conditions include: the first parameter of the target electric core is within a preset balance mark threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
the equalization duration module is connected with the equalization marking module and is used for obtaining the equalization duration of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and preset equalization current;
the equalization execution module is connected with the equalization duration module and is used for equalizing the battery cell to be equalized within the equalization duration of the battery cell to be equalized; the battery cell balancing method is also used for judging whether a second parameter of the battery cell to be balanced is within a preset balancing execution threshold range according to a stored serial number corresponding to the battery cell to be balanced, so that the battery cell to be balanced is balanced according to the residual balancing duration of the stored battery cell to be balanced;
and the storage module is connected with the equalization duration module and the equalization execution module and is used for storing the number corresponding to the battery cell to be equalized and the equalization duration thereof and storing the residual equalization duration of the battery cell to be equalized when equalization is interrupted.
The battery equalization control system provided by the embodiment realizes the electrical property difference of a single battery cell in the battery pack, improves the service capacity of the battery, prolongs the service life of the battery, prevents the occurrence of excessive equalization and error equalization, and effectively ensures that the capacity of the battery cell monomer with the minimum electric capacity in the battery pack is maximized in the whole life cycle of the battery, thereby realizing the capacity maximization of the battery pack.
Example four
Based on the same inventive concept, the present embodiment provides a computer-readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App, etc., on which a computer program is stored, which when executed by a processor, may implement the following method steps:
step 301: acquiring a first parameter and electric capacity of each electric core in the battery pack; the first parameters comprise real-time voltage, real-time temperature, real-time current and standing time length of the battery core;
step 302: obtaining the minimum capacitance and the average capacitance of the battery pack according to the capacitance of each battery cell;
step 303: obtaining a target capacity of the battery pack according to the minimum capacity;
step 304: determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset balance mark threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
step 305: obtaining the equalization time of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and a preset equalization current;
step 306: and balancing the battery cell to be balanced within the balancing time of the battery cell to be balanced.
The specific embodiment process of the above method steps can be referred to as embodiment one, and the detailed description of this embodiment is not repeated herein.
EXAMPLE five
Based on the same inventive concept, the present embodiment provides an electronic device, which may be a mobile phone, a computer, or a tablet computer, and the electronic device includes a memory and a processor, where the memory stores a computer program, and the computer program is executed by the processor to implement the battery balancing control method as described in the first embodiment. It is understood that the electronic device may also include multimedia components, input/output (I/O) interfaces, and communication components.
The processor is configured to perform all or part of the steps in the battery balancing control method according to the first embodiment. The memory is used to store various types of data, which may include, for example, instructions for any application or method in the electronic device, as well as application-related data.
The Processor may be an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is configured to perform all or part of the steps of the battery equalization control method according to the first embodiment.
The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk.
The multimedia components may include a screen, which may be a touch screen, and an audio component for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in a memory or transmitted through a communication component. The audio assembly also includes at least one speaker for outputting audio signals.
The I/O interface provides an interface between the processor and other interface modules, such as a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons.
The communication component is used for carrying out wired or wireless communication between the electronic equipment and other equipment. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G or 4G, or a combination of one or more of them, so that the corresponding Communication component may include: Wi-Fi module, bluetooth module, NFC module.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for controlling battery equalization, the method comprising the steps of:
acquiring a first parameter and electric capacity of each electric core in the battery pack;
obtaining the minimum capacitance and the average capacitance of the battery pack according to the capacitance of each battery cell;
obtaining a target capacity of the battery pack according to the minimum capacity;
determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset balance mark threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
obtaining the equalization time of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and a preset equalization current;
and balancing the battery cell to be balanced within the balancing time of the battery cell to be balanced.
2. The battery equalization control method according to claim 1, wherein the first parameter includes a real-time voltage, a real-time temperature, a real-time current, and a standing time period;
the step of determining a target cell meeting a preset condition as a cell to be balanced specifically includes:
judging whether the real-time voltage, the real-time temperature, the real-time current and the standing time of the target battery cell are all within the corresponding preset balance mark threshold range;
when the real-time voltage, the real-time temperature, the real-time current and the standing time of the target electric core are all within the range of preset marking threshold values, further judging whether the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
and if the electric capacity of the target electric core is larger than the average electric capacity and larger than the target electric capacity, determining the target electric core as the electric core to be equalized.
3. The battery balance control method according to claim 1, wherein after the step of obtaining the balancing time of the battery cell to be balanced according to the electric capacity of the battery cell to be balanced and a preset balancing current, the method further comprises:
and storing the number corresponding to the battery cell to be balanced and the balancing time length of the battery cell to be balanced.
4. The battery balance control method according to claim 1, wherein the step of balancing the battery cell to be balanced within the balancing duration of the battery cell to be balanced specifically includes:
and in the process of carrying out balanced discharge on the battery cell to be balanced, if the battery pack is powered off, interrupting the balance, and storing the number corresponding to the battery cell to be balanced and the residual balancing time.
5. The battery balance control method according to claim 3 or 4, wherein the step of balancing the battery cell to be balanced within the balancing duration of the battery cell to be balanced specifically includes:
judging whether a second parameter of the battery cell to be balanced is within a preset balance execution threshold range according to a stored number corresponding to the battery cell to be balanced;
and if the stored second parameter of the battery cell to be balanced is within a preset balance execution threshold range, balancing the battery cell to be balanced according to the stored residual balance duration of the battery cell to be balanced.
6. The battery equalization control method according to claim 5, wherein said second parameter includes a real-time voltage and a real-time temperature;
the step of judging whether the second parameter of the battery cell to be equalized is within a preset equalization execution threshold range according to the stored number corresponding to the battery cell to be equalized specifically includes:
acquiring real-time voltage and real-time temperature of the battery cell to be balanced according to the stored serial number of the battery cell to be balanced;
judging whether the real-time voltage and the real-time temperature of the battery cell to be balanced are both within the corresponding preset balance execution threshold range;
if the stored second parameter of the battery cell to be equalized is within a preset equalization execution threshold range, equalizing the battery cell to be equalized according to the stored remaining equalization duration of the battery cell to be equalized, which specifically includes:
and when the stored real-time voltage and real-time temperature of the battery cell to be equalized are both within the corresponding preset equalization execution threshold range, equalizing the battery cell to be equalized according to the stored residual equalization duration of the battery cell to be equalized.
7. The battery equalization control method of claim 5, wherein after the step of equalizing the cell to be equalized within the equalization time period of the cell to be equalized, the method further comprises:
and when the balance time length timing is finished, clearing the stored serial numbers corresponding to the battery cores to be balanced, and terminating the balance.
8. A battery equalization control system, the system comprising:
the parameter acquisition module is used for acquiring a first parameter of each battery cell in the battery pack;
the electric capacity module is connected with the parameter acquisition module and used for obtaining the electric capacity of each battery cell according to the first parameter of each battery cell and obtaining the minimum electric capacity and the average electric capacity of the battery pack according to the electric capacity of each battery cell;
a target capacitance module connected to the capacitance module for obtaining a target capacitance of the battery pack according to the minimum capacitance;
the balance marking module is connected with the parameter acquisition module and the target capacitance module and is used for determining a target battery cell meeting preset conditions as a battery cell to be balanced, wherein the preset conditions comprise: the first parameter of the target electric core is within a preset balance mark threshold range, and the electric capacity of the target electric core is larger than the average electric capacity and the target electric capacity;
the equalization duration module is connected with the equalization marking module and is used for obtaining the equalization duration of the battery cell to be equalized according to the electric capacity of the battery cell to be equalized and preset equalization current;
and the equalization execution module is connected with the equalization time length module and used for equalizing the battery cell to be equalized within the equalization time length of the battery cell to be equalized.
9. A storage medium having stored thereon a computer program executable by one or more processors to implement a battery equalization control method according to any one of claims 1 to 7.
10. An electronic device, characterized in that the electronic device comprises a memory and a processor, the memory having stored thereon a computer program which, when executed by the processor, implements the battery equalization control method according to any one of claims 1 to 7.
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