CN115085324A - Battery equalization control method and control device - Google Patents
Battery equalization control method and control device Download PDFInfo
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- CN115085324A CN115085324A CN202210798135.1A CN202210798135A CN115085324A CN 115085324 A CN115085324 A CN 115085324A CN 202210798135 A CN202210798135 A CN 202210798135A CN 115085324 A CN115085324 A CN 115085324A
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- equalization
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
Abstract
The embodiment of the invention discloses a battery equalization control method and a control device. The battery balance control method comprises the following steps: and acquiring the charge and discharge state of the single battery. And if the single batteries are in a charging state, adding a charging equalization mark to the single batteries meeting the condition of adding the charging equalization mark. And if the single battery is in a discharging state, adding a discharging balance mark to the single battery meeting the condition of adding the discharging balance mark. And determining the charge-discharge balance type and the charge-discharge balance time, and performing discharge balance. According to the embodiment of the invention, whether each single battery needs to be balanced or not is respectively judged by distinguishing the charging and discharging states of the batteries, and the balancing time is determined according to the charging and discharging states of the batteries. The equalization discharge depth of each single battery needing equalization can be calculated more accurately, so that the equalized single batteries are higher in consistency, and a better equalization effect is achieved.
Description
Technical Field
The embodiment of the invention relates to a battery equalization technology, in particular to a battery equalization control method and a control device.
Background
At present, a high-capacity power battery pack is widely applied to new energy automobiles, and rechargeable battery cells have differences in manufacturing and using environments. This variability makes the cell consistency problem worse during use.
In order to improve the consistency of the battery cells, the current method is usually to balance the battery pack according to parameters such as the voltage of the battery cells. The judgment condition of the discharge equalization depth is single, so that the equalization effect is poor, and the consistency of the single batteries cannot be corrected well.
Disclosure of Invention
The invention provides a battery equalization control method and a control device, which are used for improving the equalization effect of batteries and improving the consistency of single batteries.
In a first aspect, an embodiment of the present invention provides a battery equalization control method, including:
acquiring the charge and discharge states of the single batteries;
adding a charge balance mark or a discharge balance mark to the single battery according to the charge-discharge state of the single battery;
if the single battery is in a discharging state, judging whether the single battery meets the condition of adding a discharging balance mark according to the parameters of the single battery, and adding the discharging balance mark to the single battery meeting the condition of adding the discharging balance mark;
calculating the charge equalization time of all the single batteries with the charge equalization marks; calculating the discharge equalization time of all the single batteries with the discharge equalization marks;
judging the charge and discharge balance type and the charge and discharge balance time according to the number of the charge balance marks, the number of the discharge balance marks, the charge balance time and the discharge balance time on all the single batteries;
and performing discharge equalization of the charge equalization time on the single battery with the charge equalization mark or the discharge equalization mark according to the charge and discharge equalization type.
Optionally, when performing discharge equalization of the charge equalization time on the single battery with the charge equalization flag or the discharge equalization flag according to the charge and discharge equalization type, the method further includes, in a discharge equalization state, when a difference between a voltage of the single battery and a battery voltage average value is smaller than a preset difference, ending the discharge equalization of the single battery in advance, and clearing the charge equalization flag, the discharge equalization flag, the charge equalization time, and the discharge equalization time of the single battery.
Optionally, when performing discharge equalization of the charge equalization time on the single battery with the charge equalization flag or the discharge equalization flag according to the charge/discharge equalization type, the method further includes, in a state of performing discharge equalization, stopping discharge equalization of all the single batteries if a battery management system reports a fault.
Optionally, the condition of adding the charge equalization mark includes that after the charging current of the single battery is smaller than a preset current, the voltage of the single battery is larger than a preset voltage.
Optionally, the condition of adding the discharge balancing mark includes that when the minimum voltage in all the single batteries is smaller than the plateau lower limit voltage, the voltage of the single batteries is in the highest preset proportion of the voltage in all the single batteries arranged from the largest to the smallest and most front. .
Optionally, the calculating the charge equalization time of all the single batteries with the charge equalization flag includes calculating T 1 ＝A 1 *C cap *K/I Bal ；
When VmaxSOC-VminSOC is less than or equal to B 1 When, A 1 When VmaxSOC-VminSOC is greater than B 1 When, A 1 ＝B 1 ；
Wherein, T 1 For the charge equalization time, A 1 To charge with poor state of charge, B 1 For a preset state of charge difference, VmaxSOC is the maximum state of charge of all the single batteries, and VminSOC is allMinimum state of charge, C, in the cell cap Is the maximum available capacity of the single battery, K is a preset coefficient, I Bal To equalize the currents.
Optionally, the calculating the discharge balance time of all the single batteries with the discharge balance marks comprises calculating T 2 ＝A 2 *C cap *K/I Bal ；
When VmaxSOC-VminSOC is less than or equal to B 2 When, A 2 When VmaxSOC-VminSOC is greater than B 2 When, A 2 ＝B 2 ；
Wherein, T 2 For the discharge equalization time, A 2 To discharge a poor state of charge, B 2 For a preset discharge state of charge difference, VmaxSOC is the maximum state of charge in all the single batteries, VminSOC is the minimum state of charge in all the single batteries, C cap Is the maximum available capacity of the single battery, K is a preset coefficient, I Bal To equalize the currents.
Optionally, the determining the charge-discharge equalization type and the charge-discharge equalization time according to the number of charge equalization marks, the number of discharge equalization marks, the charge equalization time, and the discharge equalization time on all the single batteries includes:
all the single batteries are only added with the charge equalization marks, the discharge equalization marks are not added, and under the condition that the charge equalization time is not 0, the charge and discharge equalization type is charge equalization, and the charge and discharge equalization time is the charge equalization time;
all the single batteries are only added with the discharge equalization marks, the charge equalization marks are not added, and under the condition that the discharge equalization time is not 0, the charge and discharge equalization type is discharge equalization, and the charge and discharge equalization time is the discharge equalization time;
and all the single batteries have the single batteries added with the charge equalization marks and the single batteries added with the discharge equalization marks, and under the condition that the charge equalization time and the discharge equalization time are not 0, the charge and discharge equalization type is charge equalization, and the charge and discharge equalization time is the charge equalization time.
Optionally, the performing of the discharge equalization on the single battery with the charge equalization mark or the discharge equalization mark for the charge equalization time includes:
dividing the single batteries with the charge equalization marks or the discharge equalization marks into two groups, wherein the single batteries of the first group stop discharging within a preset pause time after discharging for a preset discharge time, so that the single batteries of the second group stop discharging within the preset pause time after discharging for the preset discharge time, and the process is circulated until the discharge time of the single batteries reaches the charge-discharge equalization time.
In a second aspect, an embodiment of the present invention further provides a battery balancing control apparatus, including:
the battery state acquisition module is used for acquiring the charge and discharge states of the single batteries;
the charging equalization mark adding module is used for judging whether the single battery meets the condition of adding the charging equalization mark according to the parameters of the single battery when the single battery is in a charging state, and adding the charging equalization mark to the single battery meeting the condition of adding the charging equalization mark;
the discharging balance mark adding module is used for judging whether the single battery meets the condition of adding the discharging balance mark according to the parameters of the single battery when the single battery is in a discharging state, and adding the discharging balance mark to the single battery meeting the condition of adding the discharging balance mark;
the equalization time calculation module is used for calculating the charge equalization time of all the single batteries with the charge equalization marks; calculating the discharge equalization time of all the single batteries with the discharge equalization marks;
the charging and discharging equalization type and charging and discharging equalization time determining module is used for judging the charging and discharging equalization type and charging and discharging equalization time according to the number of the charging equalization marks, the number of the discharging equalization marks, the charging equalization time and the discharging equalization time on all the single batteries;
and the discharge balance execution module is used for carrying out discharge balance of the charge balance time on the single battery with the charge balance mark or the discharge balance mark according to the charge and discharge balance type.
According to the battery balance control method in the embodiment of the invention, the charge-discharge state of a single battery is firstly obtained; and if the single battery is in a charging state, judging whether the single battery meets the condition of adding the charging equalization mark according to the parameters of the single battery, and adding the charging equalization mark to the single battery meeting the condition of adding the charging equalization mark. And if the single battery is in a discharging state, judging whether the single battery meets the condition of adding the discharging balance mark according to the parameters of the single battery, and adding the discharging balance mark to the single battery meeting the condition of adding the discharging balance mark. Then, charge equalization time of all the single batteries with the charge equalization marks is calculated, and discharge equalization time of all the single batteries with the discharge equalization marks is calculated. And judging the charge-discharge equalization type and the charge-discharge equalization time according to the number of the charge equalization marks, the number of the discharge equalization marks, the charge equalization time and the discharge equalization time on all the single batteries. And performing discharge equalization of the charge equalization time on the single battery with the charge equalization mark or the discharge equalization mark according to the charge and discharge equalization type. According to the embodiment of the invention, whether each single battery needs to be balanced or not is respectively judged by distinguishing the charging and discharging states of the batteries, and the balancing time is determined according to the charging and discharging states of the batteries. The equalization discharge depth of each single battery needing equalization can be calculated more accurately, so that the equalized single batteries are higher in consistency, and a better equalization effect is achieved.
Drawings
Fig. 1 is a flowchart of a battery equalization control method according to an embodiment of the present invention;
fig. 2 is a flowchart of a battery equalization control method according to an embodiment of the present invention;
fig. 3 is a flowchart of a charging equalization time and discharging equalization time calculation method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery balancing control apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a battery equalization control method according to an embodiment of the present invention, and refer to fig. 1. The embodiment of the invention provides a battery equalization control method, which comprises the following steps:
s1: and acquiring the charge and discharge states of the single batteries.
The battery management system can judge the charge and discharge state of the battery pack, and the charge and discharge state of the single battery can be determined according to the charge and discharge state of the battery pack.
S2: and adding a charge balance mark or a discharge balance mark to the single battery according to the charge-discharge state of the single battery.
Wherein, the step S2 may include the step S21 and the step S31.
S21: and if the single battery is in a charging state, judging whether the single battery meets the condition of adding the charging equalization mark according to the parameters of the single battery, and adding the charging equalization mark to the single battery meeting the condition of adding the charging equalization mark.
The condition for adding the charge equalization mark can be judged according to the single battery parameters acquired by the battery management system. The embodiment of the present invention does not limit the preset judgment condition of the charging flag, and a method for judging whether the single battery meets the condition of adding the charging equalization flag according to the parameter of the single battery will be described below.
Fig. 2 is a flowchart of a battery equalization control method according to an embodiment of the present invention, and refer to fig. 2. Optionally, the condition of adding the charge equalization mark includes that after the charging current of the single battery is less than the preset current, the voltage of the single battery is greater than the preset voltage.
The condition of adding the charge equalization mark can be set to be that the charging current and the voltage of the single battery accord with a preset condition, namely the charging current of the single battery is smaller than the preset current, and the voltage of the single battery is larger than the preset voltage. Illustratively, the preset current may be 0.3C, where C is the battery capacity, i.e., AH. The preset voltage may be 3.5 volts (V). Optionally, when the voltage of the single battery exceeds a preset voltage and lasts for a preset time, the single battery is determined to need to be equalized, and a charge equalization mark is added. For example, the preset time may be 5 seconds. The embodiment of the present application is only taken as an example, and is not limited thereto, for example, the preset current may be 0.1C to 0.3C, and the preset voltage may be 3.5V to 3.55V.
S31: if the single battery is in a discharging state, judging whether the single battery meets the condition of adding the discharging balance mark according to the parameters of the single battery, and adding the discharging balance mark to the single battery meeting the condition of adding the discharging balance mark;
the condition for adding the discharge balance mark can be judged according to the single battery parameters acquired by the battery management system. The embodiment of the present invention does not limit the preset judgment condition for the discharge marker, and a method for judging whether the single battery meets the condition of adding the discharge balancing marker according to the parameters of the single battery will be described below.
With continued reference to fig. 2, optionally, the condition for adding the discharge balancing flag includes that, when the minimum voltage in all the single batteries is less than the plateau lower limit voltage, the voltage of the single batteries is in the highest preset proportion of the voltages in all the single batteries arranged from large to small and the voltage of the single batteries is arranged most forward.
In the charging and discharging process of the rechargeable battery, the voltage can be stabilized within a range for a long time, so that the period during which the voltage is stabilized for a long time in the discharging process of the single battery is called a plateau period. The plateau lower limit voltage can be determined according to actual conditions. The single battery with the highest voltage in all the single batteries can be selected as the single battery to be added with the discharge balance mark. For example, when the battery pack is in a discharging state, the battery management system judges whether the voltage of the minimum cell is in a voltage plateau period, and if the voltage of the minimum cell is not in the plateau period, the first 30% of the cells from large to small are selected to be added with a discharging balance mark.
S4: calculating the charge equalization time of all the single batteries with the charge equalization marks; calculating the discharge equalization time of all the single batteries with the discharge equalization marks;
wherein, the charging equalization time and the discharging equalization time are respectively calculated for the subsequent steps. By calculating the charge equalization time and the discharge equalization time separately, the time required for equalizing discharge can be determined more accurately.
In a possible implementation manner, fig. 3 is a flowchart of a charging equalization time and discharging equalization time calculation method provided by an embodiment of the present invention, and refer to fig. 3. Optionally, calculating the charge equalization time of all the single batteries with the charge equalization flag comprises:
s41: calculating T 1 ＝A 1 *C cap *K/I Bal ；
When VmaxSOC-VminSOC is less than or equal to B 1 When, A 1 When VmaxSOC-VminSOC is greater than B 1 When, A 1 ＝B 1 ；
Wherein, T 1 For charge equalization time, A 1 To charge with poor state of charge, B 1 For a preset state of charge difference, VmaxSOC is the maximum state of charge in all the single batteries, VminSOC is the minimum state of charge in all the single batteries, C cap Is the maximum available capacity of the single battery, K is a preset coefficient, I Bal To equalize the currents.
The preset charge state difference can be determined according to actual needs. The maximum charge state of all the single batteries and the minimum charge state of all the single batteries can be obtained through a battery management system, and the preset coefficient and the equalizing current can be determined according to actual needs. Illustratively, by the formula T 1 ＝(VmaxSOC-VminSOC)*C cap *0.6/I Bal The equalization time is calculated. When VmaxSOC-VminSOC exceeds 1%, the charge equalization time is calculated as 1%.
Optionally, calculating the discharge balance time of all the single batteries with the discharge balance marks comprises:
s42: calculating T 2 ＝A 2 *C cap *K/I Bal ；
When VmaxSOC-VminSOC is less than or equal to B 2 When, A 2 When VmaxSOC-VminSOC is greater than B 2 When, A 2 ＝B 2 ；
Wherein, T 2 For discharge equalization time, A 2 To discharge a poor state of charge, B 2 For a preset discharge state of charge difference, VmaxSOC is the maximum state of charge in all the cells, VminSOC is the minimum state of charge in all the cells, C cap Is the maximum available capacity of the single battery, K is a preset coefficient, I Bal To equalize the currents.
The preset discharge state of charge difference can be determined according to actual needs. The maximum state of charge in all the single batteries and the minimum state of charge in all the single batteries can be acquired through a battery management system, and the preset coefficient and the equalizing current can be determined according to actual needs. Illustratively, by the formula T 2 ＝(VmaxSOC-VminSOC)*C cap *0.6/I Bal The equalization time is calculated. When VmaxSOC-VminSOC exceeds 2%, it is calculated as 2% when the charge equalization time is calculated. S5: judging the charging and discharging equalization type and the charging and discharging equalization time according to the number of the charging equalization marks, the number of the discharging equalization marks, the charging equalization time and the discharging equalization time on all the single batteries;
the charging and discharging equalization type and the charging and discharging equalization time can be determined according to the number of the charging equalization marks, the number of the discharging equalization marks, the charging equalization time and the discharging equalization time, and the charging and discharging equalization type and the charging and discharging equalization time can be used in the subsequent steps.
It should be noted that, the method for determining the charge equalization time and the discharge equalization time in the embodiment of the present application is not limited thereto, and in other possible implementations, the determination may also be performed in some ways in the prior art, and details of the embodiment of the present application are not described again.
Optionally, determining the charge-discharge equalization type and the charge-discharge equalization time according to the number of charge equalization marks, the number of discharge equalization marks, the charge equalization time, and the discharge equalization time on all the single batteries includes:
s51: and under the conditions that all the single batteries are only added with charge equalization marks and are not added with discharge equalization marks, and the charge and discharge equalization time is not 0, the charge and discharge equalization type is charge equalization, and the charge and discharge equalization time is charge equalization time.
S52: and under the conditions that all the single batteries are only added with the discharge equalization marks and are not added with the charge equalization marks, and the discharge equalization time is not 0, the charge and discharge equalization type is discharge equalization, and the charge and discharge equalization time is discharge equalization time.
S53: all the single batteries have the single batteries added with the charge equalization marks and the single batteries added with the discharge equalization marks, and under the condition that the charge equalization time and the discharge equalization time are not 0, the charge and discharge equalization type is charge equalization, and the charge and discharge equalization time is charge equalization time.
If only one equalization mark exists and the equalization time is not 0, the battery management system equalizes the single battery according to the equalization mark and the equalization time. If the charging and discharging balance marks exist at the same time and the balance time is not equal to 0, the battery management system can perform balance preferentially according to the charging balance marks. It can also be done as follows: firstly, whether a charge equalization mark exists or not is judged, and the charge equalization time is not zero. And if so, carrying out equalization according to the charge equalization mark and the charge equalization time, and if not, continuously judging whether a discharge equalization mark exists or not and the discharge equalization time is not zero. And if so, carrying out equalization according to the discharge equalization mark and the discharge equalization time, otherwise, carrying out imbalance.
S6: and performing discharge equalization of the charge equalization time on the single battery with the charge equalization mark or the discharge equalization mark according to the charge and discharge equalization type.
Wherein, the discharge balance can be terminated after the charge-discharge balance time is over. And, not only can the end of charge-discharge equilibrium time terminate discharge equilibrium, when other events occur, also can terminate discharge equilibrium in advance. Two conditions capable of terminating the discharge equalization early will be described below.
Optionally, the battery equalization control method further includes, in the discharge equalization state, when a difference between the voltage of the single battery and the average value of the battery voltage is smaller than a preset difference, ending the discharge equalization of the single battery in advance, and clearing the charge equalization flag, the discharge equalization flag, the charge equalization time, and the discharge equalization time of the single battery.
If the difference between the voltage of the single battery and the average value of the voltage of the battery is smaller than the preset difference, the fact that the discharging balance performed on the single battery enables the single battery to have better consistency relative to other batteries is indicated, and further discharging balance is not needed. Therefore, the discharge balance is finished in advance, and the battery pack balance is more accurately performed.
Optionally, the battery balancing control method further includes, in a state of performing discharge balancing, stopping discharge balancing of all the single batteries if the battery management system reports a fault.
Because the battery management system reports the fault, further performing discharge equalization may increase the safety risk of the battery, and thus, the discharge equalization of all the single batteries is stopped. The method improves the safety of the single battery and reduces the safety risk.
Optionally, performing discharge equalization on the single battery with the charge equalization mark or the discharge equalization mark for the charge and discharge equalization time includes:
and dividing the single batteries with the charge equalization marks or the discharge equalization marks into two groups, wherein the first group of single batteries stops discharging within a preset pause time after discharging for a preset discharge time, and the second group of single batteries stops discharging within the preset pause time after discharging for the preset discharge time, and the process is circulated until the discharge time of the single batteries reaches the charge-discharge equalization time.
The preset discharge time and the preset pause time can be determined according to actual needs. In addition, when the single batteries with the charge equalization marks or the discharge equalization marks are grouped, the single batteries can also be grouped into at least three groups, for example, into three or four groups. The aim of discharge balance can be achieved by circularly discharging a plurality of groups of single batteries according to the method. Illustratively, in performing discharge equalization, the battery management system switches every minute by equalizing odd-numbered positions first, equalizing 55s and then pausing for 5s, and then equalizing even-numbered position cells. When the voltage of a certain cell in the equalization is less than 20mV compared with the average voltage, the equalization of the cell at the position is stopped, and the equalization mark and time are cleared. In addition, if the cell balancing time becomes 0 or the battery management system reports a fault, the balancing of all the cells is stopped.
According to the embodiment of the invention, whether each single battery needs to be balanced or not is respectively judged by distinguishing the charging and discharging states of the batteries, and the balancing time is determined according to the charging and discharging states of the batteries. The equalization discharge depth of each single battery needing equalization can be calculated more accurately, so that the equalized single batteries are higher in consistency, and a better equalization effect is achieved.
Fig. 4 is a schematic structural diagram of a battery equalization control device according to an embodiment of the present invention, and refer to fig. 4. An embodiment of the present invention further provides a battery equalization control apparatus, including:
and the battery state acquisition module 1 is used for acquiring the charge and discharge states of the single batteries.
And the charging equalization mark adding module 2 is used for judging whether the single battery meets the condition of adding the charging equalization mark according to the parameters of the single battery when the single battery is in a charging state, and adding the charging equalization mark to the single battery meeting the condition of adding the charging equalization mark.
And the discharging balance mark adding module 3 is used for judging whether the single battery meets the condition of adding the discharging balance mark according to the parameters of the single battery when the single battery is in a discharging state, and adding the discharging balance mark to the single battery meeting the condition of adding the discharging balance mark.
The equalization time calculation module 4 is used for calculating the charge equalization time of all the single batteries with the charge equalization marks; and calculating the discharge equalization time of all the single batteries with the discharge equalization marks.
And the charging and discharging equalization type and charging and discharging equalization time determining module 5 is used for judging the charging and discharging equalization type and the charging and discharging equalization time according to the number of the charging equalization marks, the number of the discharging equalization marks, the charging equalization time and the discharging equalization time on all the single batteries.
And the discharge balance execution module 6 is used for performing discharge balance of the charge balance time on the single battery with the charge balance mark or the discharge balance mark according to the charge and discharge balance type.
The battery equalization control device provided by the embodiment of the invention comprises the battery equalization control method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for controlling battery equalization, comprising:
acquiring the charge and discharge state of the single battery;
adding a charge equalization mark or a discharge equalization mark to the single battery according to the charge-discharge state of the single battery;
calculating the charge equalization time of all the single batteries with the charge equalization marks; calculating the discharge equalization time of all the single batteries with the discharge equalization marks;
judging the charge and discharge balance type and the charge and discharge balance time according to the number of the charge balance marks, the number of the discharge balance marks, the charge balance time and the discharge balance time on all the single batteries;
and performing discharge equalization of the charge equalization time on the single battery with the charge equalization mark or the discharge equalization mark according to the charge and discharge equalization type.
2. The battery equalization control method according to claim 1, wherein, when performing discharge equalization for the charge equalization time on the unit battery with the charge equalization flag or the discharge equalization flag according to the charge/discharge equalization type, the method further comprises: and under the discharge equalization state, when the difference value between the voltage of the single battery and the average value of the battery voltage is smaller than a preset difference value, ending the discharge equalization of the single battery in advance, and clearing the charge equalization mark, the discharge equalization mark, the charge equalization time and the discharge equalization time of the single battery.
3. The battery equalization control method according to claim 1, wherein, when performing discharge equalization for the charge equalization time on the unit battery with the charge equalization flag or the discharge equalization flag according to the charge/discharge equalization type, the method further comprises: and under the discharge balancing state, if the battery management system reports a fault, stopping the discharge balancing of all the single batteries.
4. The battery equalization control method according to claim 1, wherein the condition for adding the charge equalization flag includes: and after the charging current of the single battery is smaller than the preset current, the voltage of the single battery is larger than the preset voltage.
5. The battery equalization control method according to claim 1, wherein the condition for adding the discharge equalization flag includes: and when the minimum voltage in all the single batteries is smaller than the lower limit voltage in the plateau period, the voltage of the single batteries is in a preset proportion that the voltage in all the single batteries is arranged from large to small and is most forward.
6. The battery equalization control method according to claim 1, wherein the calculating of the charge equalization time of all the unit batteries having the charge equalization flag comprises: calculating T 1 ＝A 1 *C cap *K/I Bal ；
When VmaxSOC-VminSOC is less than or equal to B 1 When, A 1 When VmaxSOC-VminSOC is greater than B 1 When, A 1 ＝B 1 ；
Wherein, T 1 For the charge equalization time, A 1 To charge with poor state of charge, B 1 For a preset state of charge difference, VmaxSOC is the maximum state of charge of all the single batteries, VminSOC is the minimum state of charge of all the single batteries, C cap Is the maximum available capacity of the single battery, K is a preset coefficient, I Bal To equalize the currents.
7. The battery equalization control method according to claim 1, wherein the calculating of the discharge equalization time of all the unit batteries having the discharge equalization flag includes: calculating T 2 ＝A 2 *C cap *K/I Bal ；
When VmaxSOC-VminSOC is less than or equal to B 2 When, A 2 When VmaxSOC-VminSOC is greater than B 2 When, A 2 ＝B 2 ；
Wherein, T 2 For the discharge equalization time, A 2 To discharge a poor state of charge, B 2 For a predetermined discharge state of charge difference, VmaxSOC is the maximum state of charge of all the single batteriesVminSOC is the minimum state of charge of all the single batteries, C cap Is the maximum available capacity of the single battery, K is a preset coefficient, I Bal To equalize the currents.
8. The battery equalization control method according to claim 1, wherein the determining of the charge/discharge equalization type and the charge/discharge equalization time based on the number of charge equalization marks, the number of discharge equalization marks, the charge equalization time, and the discharge equalization time on all the unit batteries comprises:
all the single batteries are only added with the charge equalization marks, the discharge equalization marks are not added, and under the condition that the charge equalization time is not 0, the charge and discharge equalization type is charge equalization, and the charge and discharge equalization time is the charge equalization time;
all the single batteries are only added with the discharge equalization marks, the charge equalization marks are not added, and under the condition that the discharge equalization time is not 0, the charge and discharge equalization type is discharge equalization, and the charge and discharge equalization time is the discharge equalization time;
and all the single batteries have the single batteries added with the charge equalization marks and the single batteries added with the discharge equalization marks, and under the condition that the charge equalization time and the discharge equalization time are not 0, the charge and discharge equalization type is charge equalization, and the charge and discharge equalization time is the charge equalization time.
9. The battery equalization control method according to claim 1, wherein the performing of the discharge equalization for the charge-discharge equalization time on the unit battery with the charge equalization flag or the discharge equalization flag includes:
dividing the single batteries with the charge equalization marks or the discharge equalization marks into two groups, wherein the single batteries of the first group stop discharging within a preset pause time after discharging within a preset discharge time, and the single batteries of the second group stop discharging within the preset pause time after discharging within the preset discharge time, and repeating the above processes until the discharge time of the single batteries reaches the charge-discharge equalization time.
10. A battery equalization control apparatus, comprising:
the battery state acquisition module is used for acquiring the charge and discharge states of the single batteries;
the charging equalization mark adding module is used for judging whether the single battery meets the condition of adding the charging equalization mark according to the parameters of the single battery when the single battery is in a charging state, and adding the charging equalization mark to the single battery meeting the condition of adding the charging equalization mark;
the discharging balance mark adding module is used for judging whether the single battery meets the condition of adding the discharging balance mark according to the parameters of the single battery when the single battery is in a discharging state, and adding the discharging balance mark to the single battery meeting the condition of adding the discharging balance mark;
the equalization time calculation module is used for calculating the charge equalization time of all the single batteries with the charge equalization marks; calculating the discharge equalization time of all the single batteries with the discharge equalization marks;
the charging and discharging equalization type and charging and discharging equalization time determining module is used for judging the charging and discharging equalization type and charging and discharging equalization time according to the number of the charging equalization marks, the number of the discharging equalization marks, the charging equalization time and the discharging equalization time on all the single batteries;
and the discharge balance execution module is used for carrying out discharge balance of the charge balance time on the single battery with the charge balance mark or the discharge balance mark according to the charge and discharge balance type.
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| CN116418085A (en) * | 2023-04-06 | 2023-07-11 | 贲安能源科技(上海)有限公司 | Saline water battery balance control method |
| CN116418085B (en) * | 2023-04-06 | 2024-04-05 | 贲安能源科技(上海)有限公司 | Saline water battery balance control method |
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