CN107769279B - Control method for parallel connection and lap joint of batteries - Google Patents
Control method for parallel connection and lap joint of batteries Download PDFInfo
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- CN107769279B CN107769279B CN201610685673.4A CN201610685673A CN107769279B CN 107769279 B CN107769279 B CN 107769279B CN 201610685673 A CN201610685673 A CN 201610685673A CN 107769279 B CN107769279 B CN 107769279B
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a control method for parallel lapping of batteries, which is characterized in that in a load system with a first battery, when a second battery is lapped in parallel in a hot-plugging mode, the battery electric quantity difference between the first battery and the second battery is compared firstly, and when the battery electric quantity difference is smaller than a preset value, the load extraction or charging current of the system to the first battery is reduced. And then, under the condition of low load or low current charging, comparing the voltage difference between the first battery and the second battery, and when the voltage difference is smaller than another preset value, connecting the second battery in parallel in a load system and recovering the original load or charging current.
Description
Technical Field
The present invention relates to a control method of a battery circuit, and more particularly, to a control method of a secondary battery connected in parallel to a load system.
Background
With the convenience of battery operation and the wider application field, parallel connection of multiple batteries is one of the methods that can directly increase the battery capacity of a load system or increase the power used by the load. In the prior art, to connect a battery originally outside a system, which is a rechargeable secondary battery (rechargeable battery), in parallel to a load system already having a battery, the battery may be connected by a voltage determination method or by a state of charge (SOC) determination method.
When the entire load system is stationary, it is the safest way to lap another battery to the load system. However, the hot plug operation mode in which the load system directly connects to another battery in the working state is a more and more important requirement in the present environment. Since the cells in the load system may be in high power and high current operation during the lapping process, if another cell is lapped in the load system by simply using voltage judgment or simply using capacity judgment, there is a risk caused by high error.
For example, if only the battery voltage is used as a determination method for determining whether another battery can be connected, when the battery in the load system is being unloaded, the impedance in the battery or the line will cause a voltage drop, and in an environment with a voltage drop, a new battery is connected in a bridging manner, so that a shunt effect is generated, and the current of the battery in the load system is reduced, the voltage drop of the battery is greatly increased, or even exceeds the safety value of the voltage difference between two batteries connected in parallel in the original setting, which may damage the life of the battery core and the safety of the use environment.
If the determination is made only by SOC (SOC is represented by the amount of electricity calculated by the battery itself, and SOC can be calculated by many functions and parameters), the actual voltage of the battery may not be reflected instantaneously. For example, although the higher the SOC of a battery, the higher the voltage, the voltage of the battery is not only related to the SOC, but also to the load to which the battery is subjected. The higher the battery load, the greater the voltage drop it will instantaneously react to. For example, when the SOC of both cells is 50%, and one of the cells is being pumped, the voltage of the pumped cell drops to some extent (it can be seen that the actual voltage of the cell when not being pumped is higher), while the other cell is not yet bridged and is at rest. If the battery in a static state is connected to a load system in which the battery is being pumped up simply because the SOC of both batteries is 50%, obviously, the voltage between the two batteries is not equivalent, and a surge current is generated in the battery switch, so that the switch is at risk of failure and damage.
Disclosure of Invention
In order to solve the aforementioned problems, the present invention discloses a control method for bridging a battery in parallel in a load system.
In one embodiment of the invention, a method for controlling parallel lapping of batteries is disclosed. In a load system including a load device, and a first battery and a second battery connected in parallel with the load device, a first switch is connected in series between the first battery and the load device, and a second switch is connected in series between the second battery and the load device, the control method includes the steps of: comparing a first battery capacity of the first battery with a second battery capacity of the second battery when the first switch is turned on, the second switch is not turned on, and the first battery is subjected to a high-load pumping by the load device; when the difference between the first battery capacity and the second battery capacity is smaller than a first preset value, the load device is reduced from the high load to a low load; comparing a first voltage of the first battery with a second voltage of the second battery in a state where the first battery is subjected to the load by the load device at the low load; when the difference between the first voltage and the second voltage is smaller than a second preset value, the second switch is turned on, so that the first battery and the second battery are both subjected to load extraction by the load device; and the load device is raised from the low load to the high load to drain the first battery and the second battery.
In the embodiments disclosed herein, the load device is pumped by the high load with a first current or a first power, and the load device is pumped by the low load with a second current or a second power, wherein the first current is greater than the second current, and the first power is greater than the second power.
In a disclosed embodiment, when the second switch is turned on, the load device is raised from the low load to a maximum load to drain the first battery and the second battery.
In the embodiments disclosed herein, the load device is pumped at a first current or a first power when the load device is pumped at the high load, and the load device is pumped at a third current or a third power when the load device is pumped at the maximum load, wherein the third current is greater than the first current, and the third power is greater than the first power.
In a disclosed embodiment, the load system further includes a control unit that compares the first battery level of the first battery with the second battery level of the second battery, and compares the first voltage of the first battery with the second voltage of the second battery. Wherein the control unit is constituted by or included in the load device of a battery management system of the first battery and the second battery, the control unit further controlling the load device to be lowered from the high load to the low load and controlling the load device to be raised from the low load to the high load.
In a disclosed embodiment of the present invention, the control unit further turns on the second switch, so that both the first battery and the second battery are unloaded by the load device.
In a disclosed embodiment of the present invention, wherein the load system further includes a charging device, the first switch is connected in series between the first battery and the charging device, and the second switch is connected in series between the second battery and the charging device, the control method further includes: comparing the first battery charge of the first battery with the second battery charge of the second battery in a state where the first switch is turned on, the second switch is not turned on, and the first battery is charged by the charging device with a first current; when the difference between the first battery capacity and the second battery capacity is smaller than the first preset value, the charging device changes the first current into a second current to charge the first battery; comparing the first voltage of the first battery and the second voltage of the second battery in a state where the first battery is charged with the second current by the charging device; when the difference between the first voltage and the second voltage is smaller than the second preset value, turning on the second switch to enable the first battery and the second battery to be charged by the charging device; and the charging device changes from the second current to the first current to charge the first battery and the second battery. Wherein the first current is greater than the second current.
In the disclosed embodiment, when the second switch is turned on, the charging device is raised by the second current to a maximum current to charge the first battery and the second battery, wherein the maximum current is greater than the first current.
In a disclosed embodiment, the load system further includes a control unit that compares the first battery level of the first battery with the second battery level of the second battery, and compares the first voltage of the first battery with the second voltage of the second battery.
In the disclosed embodiment, wherein the control unit is constituted by a battery management system of the first battery and the second battery, the control unit further controls the charging device to change from the first current to the second current and controls the charging device to change from the second current to the first current.
In the disclosed embodiment, the control unit further turns on the second switch, so that the first battery and the second battery are both charged by the charging device.
The control method for the parallel lapping of the batteries can additionally lap a battery in parallel in a hot plugging mode in the operation process of a load system, so that the load system has longer endurance or more power output, the smooth lapping of the difference between the electric quantity and the voltage of two or more batteries which are connected in parallel can be ensured under the safe condition, the switch service life of the battery can be greatly prolonged, the service life of a battery core of the battery can be prolonged, and the purposes of safe connection and use can be achieved.
Drawings
FIG. 1 is a functional block diagram of a load system to which the control method of the present invention is applied.
Fig. 2 is a flow chart of discharge operation in the control method for cell parallel connection overlapping disclosed by the invention.
Fig. 3 is a flow chart of charging operation in the control method for parallel connection of batteries according to the present invention.
Fig. 4A to 4D are schematic diagrams of an embodiment of a discharge operation in the method for controlling parallel overlapping of batteries according to the present invention.
Fig. 5A to 5D are schematic diagrams of an embodiment of a charging operation in the method for controlling parallel overlapping of batteries according to the present invention.
Wherein the reference numerals are as follows:
Detailed Description
Referring to fig. 1, fig. 1 is a functional block diagram of a load system to which the control method of the present invention is applied. The load system 1 uses a rechargeable battery (rechargeable battery) as a power source, and the rechargeable battery can be replaced by plugging at any time when the system is in operation or not in operation. In the preferred embodiment, the load system 1 may be an electric bicycle or an electric motorcycle, but the invention is not limited thereto. The load system 1 includes a first battery 10, a second battery 20 (here, the first battery 10 and the second battery 20 each represent a secondary battery that can be repeatedly charged and discharged), a first switch 30, a second switch 40, a load device 50, and a charging device 60. In particular, the load device 50 includes all the electric components and power output components in the load system 1, and includes necessary control means, mechanical structures, motors, and the like. In addition, the charging device 60 may be the same device in the load system 1 under the general concept as the load device 50 (that is, for the load system 1, the present invention discusses the behavior control of the load and the charge of the first battery 10 and the second battery 20 in the load system 1), or may be a charging device that is plugged into the load system 1. For convenience of explanation, in the following embodiments, the load device 50 and the charging device 60 are respectively illustrated.
The first battery 10 and the second battery 20 are connected in parallel to the load device 50 and the charging device 60, respectively, on the line, and the first switch 30 is connected in series between the first battery 10 and the load device 50 and the charging device 60, and the second switch 40 is connected in series between the second battery 20 and the load device 50 and the charging device 60. The first battery 10 or the second battery 20 can be directly plugged into the load system 1, and when the load system 1 is in operation, as long as any one of the batteries supplies power to the load system 1, the other battery can also directly complete the hot plug operation on the load system 1. In practical embodiments, the second battery 20 may be pre-mounted on the load system 1, or may be additionally added during the operation of the load system 1 (e.g. during riding an electric bicycle). In fig. 1 (and the following figures), a control method performed by additionally overlapping the second battery 20 in the load system 1 will be described with a state in which the first battery 10 is loaded in the load system 1 and the first switch 30 is turned on, and the first battery 10 can be unloaded/charged (here, the first battery 10 is overlapped with the load system 1).
Referring to fig. 2, fig. 2 is a flowchart of the discharging operation in the method 100 for controlling the parallel overlapping of the batteries according to the present invention, wherein the steps of the method 100 are described as follows:
step 110: in a state where the first switch 30 is turned on and the second switch 40 is not turned on, the first battery 10 is attached to the load device 50, the second battery 20 is not attached to the load device 50, and the load device 50 pumps the first battery 10 at a high load;
step 120: comparing a first battery level of the first battery 30 with a second battery level of the second battery 40;
step 130: when the difference between the first battery capacity and the second battery capacity is smaller than a first preset value, the load device 50 reduces the high load to a low load to continue the load pumping of the first battery 10;
step 140: comparing a first voltage of the first battery 10 with a second voltage of the second battery 20 in a state where the first battery 10 is subjected to the low load by the load device 50;
step 150: when the difference between the first voltage and the second voltage is smaller than a second preset value, the second switch 40 is turned on, so that the first battery 10 and the second battery 20 are both subjected to pumping by the load device 50;
step 160: the load device 50 is raised from the low load to the high load to drain the first battery 10 and the second battery 20.
Referring to fig. 3, fig. 3 is a flowchart of charging operation in the method 100 for controlling parallel overlapping of batteries according to the present invention, and the steps are as follows:
step 210: under the condition that the first switch 30 is conducted and the second switch 40 is not conducted, the first battery 10 is connected to the charging device 60, the second battery 20 is not connected to the charging device 60, and the charging device 60 charges the first battery 10 with a first current;
step 220: comparing the first battery charge of first battery 30 and the second battery charge of second battery 40;
step 230: when the difference between the first battery capacity and the second battery capacity is smaller than the first preset value, the charging device 60 changes the first current to a second current to continue charging the first battery 10;
step 240: comparing the first voltage of the first battery 10 and the second voltage of the second battery 20 in a state where the first battery 10 is charged with the second current by the charging device 60;
step 250: when the difference between the first voltage and the second voltage is smaller than the second preset value, the second switch 40 is turned on, so that both the first battery 10 and the second battery 20 are charged by the charging device 60;
step 260: the charging device 60 changes from the second current to the first current to continue charging the first battery 10 and the second battery 20.
Referring to fig. 4A to 4D and fig. 2, fig. 4A to 4D are schematic diagrams of embodiments related to discharging operation in the method for controlling parallel overlapping of batteries according to the present invention. In fig. 4A and step 110, the first switch 30 is turned on and the second switch 40 is not turned on, that is, the load system 1 is powered by the first battery 10 to the load device 50 first, and the second battery 20 is mounted in the load system 1 but does not overlap the load device 50 (the second switch 40 is not turned on), so that equivalently in the load system 1, the second battery 20 is not connected in parallel with the first battery 10. Also in the state of fig. 4A, the load device 50 pumps the first battery 10 at the high load. The high load and the low load mentioned later can be expressed in terms of the magnitude of current or the magnitude of power, for example, in the embodiment of the present invention, the high load can be expressed in terms of the first current being pumped to the first battery 10, and the low load can be expressed in terms of the second current being pumped to the first battery 10, and the first current being larger than the second current. Alternatively, a high load may indicate that the first battery 10 is pumped up with a first power, and a low load may indicate that the first battery 10 is pumped up with a second power, and the first power is greater than the second power. In addition, in a load system 1, the magnitude of the current (power) of the low load or the high load is determined by the load device 50. In a specific technical implementation, the load system 1 may mount the first battery 10 and the second battery 20 in advance, or may mount only the first battery 10 in advance, and mount the second battery 20 in the load system 1 in a hot-plug manner when the load system 1 is in operation (i.e., when the first battery 10 supplies power to the load device 50), and since the second switch 40 between the second battery 20 and the load device 50 is not yet turned on, the second battery 20 is not mounted on the load device 50 at this time.
In the state of fig. 4A and step 110, a first battery level of the first battery 30 and a second battery level of the second battery 40 are continuously obtained and compared in step 120. Referring to fig. 1, the load system 1 further includes a control unit, which may be a central control unit integrated with the whole system, or all control operations may be completed by the load device 50 and the control elements of the batteries. For example, the load device 50 itself includes the control unit 52, and the first battery 10 itself also has a Battery Management System (BMS) 12 and the second battery 20 itself also has a Battery Management System (BMS) 22. Here, after the battery management systems 12 and 22 in the first battery 10 and the second battery 20 obtain the power states of the batteries, the battery management systems 12 and 22 operate step 120 to compare the difference between the first battery power and the second battery power, and when the difference between the first battery power and the second battery power is smaller than a first preset value, notify the load system 1 to reduce the load to the low load by using a communication signal or an input/output (I/O) signal, and continue to pump the first battery 10, as shown in step 130 and fig. 4B, at this time, the first battery capacity and a first voltage of the first battery 10 also continue to decrease at a relatively slow speed. In another embodiment, the control unit 52 of the load device 50 may obtain the power states of the batteries from the battery management systems 12 and 22 in the first battery 10 and the second battery 20, and then the control unit 52 may compare the difference between the battery powers, and automatically reduce the load to the low load when the difference between the battery powers is smaller than the first preset value.
As shown in step 140 and fig. 4C, in a state where the load device 50 continues to draw the load at the low load, the first voltage of the first battery 10 and the second voltage of the second battery 20 are continuously obtained and compared. Similarly, after the battery management systems 12,22 in the first battery 10 and the second battery 20 obtain the voltage status of the respective batteries, the battery management systems 12,22 run step 150 to compare the difference between the first voltage and the second voltage, and when the difference between the first voltage and the second voltage is smaller than a second preset value, the battery management system 12 of the first battery 10 notifies the battery management system 22 of the second battery 20 by a communication signal or an input/output (I/O) signal, and controls to turn on the second switch 40 to connect the second battery 20 to the load device 50, so as to connect the second battery 20 to the first battery 10 in parallel in the load system 1, so that both the first battery 10 and the second battery 20 are loaded by the load device 50, at this time, the load device 50 still pumps the first battery 10 and the second battery 20 at a low load. In another embodiment, after the control unit 52 of the load device 50 obtains the voltage states of the batteries from the battery management systems 12 and 22 in the first battery 10 and the second battery 20, the control unit 52 may compare the difference between the battery voltages, and when the difference between the battery voltages is smaller than the second preset value, turn on the second switch 40 or notify the battery management system 22 of the second battery 20 to turn on the second switch 40.
Finally, as shown in step 160 and fig. 4D, after the second battery 20 is connected to the load system 1 in parallel in a state close to the capacity and voltage of the first battery 10, the control unit (which may be an integrated central control unit or a cooperative operation of the control elements of the devices) of the load system 1 controls the load device 50 to be raised from the low load to the high load to load the first battery 10 and the second battery 20. In particular, since two batteries are already overlapped in parallel in the load system 1 of fig. 4D, in addition to the embodiment described in step 160 and fig. 4D, the load device 50 in the load system 1 can also pump two batteries with greater output power, that is, after the second switch 40 is turned on, the load device 50 is further raised from the low load to a maximum load to pump the first battery 10 and the second battery 20, wherein the maximum load can mean that the first battery 10 and the second battery 20 are pumped with a third current, and the third current is greater than the first current of the high load. In addition, the maximum load may also mean that the first battery 10 and the second battery 20 are pumped with a third power, and the third power is greater than the first power.
Referring to fig. 5A to 5D and fig. 3, fig. 5A to 5D are schematic diagrams of an embodiment of a charging operation in the method for controlling parallel overlapping of batteries according to the present invention. The control method of the present invention charges the batteries connected in parallel in a similar manner. In fig. 5A and step 210, the first switch 30 is turned on and the second switch 40 is turned off, that is, the charging device 60 first charges the first battery 10, and the second battery 20 does not overlap the charging device 60. Also in the state of fig. 5A, the charging device 60 charges the first battery 10 with the first current. The first current and the second current mentioned later are used to indicate a high-current charge and a low-current charge, i.e., the first current is greater than the second current. In other embodiments, different charging behaviors for the battery may be indicated with high power or low power.
In the state of fig. 5A and step 210, next, in step 220, the battery management systems 12 and 22 in the first battery 10 and the second battery 20 continuously obtain and compare the difference between the first battery capacity of the first battery 30 and the second battery capacity of the second battery 40, and when the difference between the first battery capacity and the second battery capacity is smaller than the first preset value, notify the load system 1 to continue to charge the first battery 10 with a smaller second current by using a communication signal or an input/output (I/O) signal, as shown in step 230 and fig. 5B, at this time, the first battery capacity and the first voltage of the first battery 10 also continue to rise at a relatively slow speed. In another embodiment, the central control unit of the load system 1 may obtain the power states of the batteries from the battery management systems 12 and 22 in the first battery 10 and the second battery 20, and then compare the difference between the battery powers, and when the difference between the battery powers is smaller than the first preset value, the central control unit may automatically change to the charging with the smaller second current.
As shown in step 240 and fig. 5C, the first voltage of the first battery 10 and the second voltage of the second battery 20 are continuously obtained and compared in a state where the first battery 10 is continuously charged by the charging device 60 at the second current. Similarly, after the voltages of the first battery 10 and the second battery 20 are obtained by the battery management systems 12 and 22, the battery management systems 12 and 22 operate step 250 to compare the difference between the battery voltages, and when the difference between the battery voltages is smaller than the second preset value, the battery management system 12 of the first battery 10 notifies the battery management system 22 of the second battery 20 by a communication signal or an input/output (I/O) signal to control the second switch 40 to be turned on, so that the second battery 20 is connected to the charging device 60, and in the load system 1, the second battery 20 is connected to the first battery 10 in parallel, so that both the first battery 10 and the second battery 20 are charged by the charging device 60. Specifically, the charging device 60 charges the first battery 10 and the second battery 20 at the second current (low current). In another embodiment, after the charging device 60 obtains the voltage states of the batteries from the battery management systems 12 and 22 in the first battery 10 and the second battery 20, the charging device 60 may compare the difference between the battery voltages, and when the difference between the battery voltages is smaller than the second preset value, turn on the second switch 40 or notify the battery management system 22 of the second battery 20 to turn on the second switch 40.
Finally, as shown in step 260 and fig. 5D, after the second battery 20 is connected to the load system 1 in parallel in a state close to the capacity and voltage of the first battery 10, the control unit (which may be an integrated central control unit or a cooperative operation of the control elements of the devices) of the load system 1 controls the charging device 60 to increase from the second current (or low power) to the first current (or high power) to charge the first battery 10 and the second battery 20. In particular, since two batteries are already connected in parallel in the load system 1 of fig. 5D, in addition to the embodiment described in step 260 and fig. 5D, the charging device 60 in the load system 1 can also charge the two batteries with a larger charging power, that is, after the second switch 40 is turned on, the charging device 60 is further increased by the second current to a maximum current to charge the first battery 10 and the second battery 20, wherein the maximum current is larger than the first current.
The invention discloses a control method for parallel lapping of batteries, which is characterized in that in a load system with a first battery, when a second battery is lapped in parallel in a hot-plugging mode, the battery electric quantity difference between the first battery and the second battery is compared, and when the battery electric quantity difference is smaller than a preset value, the load extraction or charging current of the system to the first battery is reduced. And then under the condition of low load or low current charging, comparing the voltage difference between the first battery and the second battery, when the voltage difference is smaller than another preset value, connecting the second battery in parallel in a load system, and recovering the original load or charging current, so that the load system has longer endurance or more power output, and the difference between the electric quantity and the voltage of two or more batteries connected in parallel can be ensured to be connected smoothly under the safe condition, the switch service life of the battery can be greatly prolonged, the service life of a battery cell of the battery can be prolonged, and the purposes of safe connection and use can be achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. In a load system including a load device and a first battery and a second battery connected in parallel with the load device, a first switch is connected in series between the first battery and the load device, and a second switch is connected in series between the second battery and the load device, a control method for a parallel lap joint of batteries includes the steps of:
comparing a first battery capacity of the first battery with a second battery capacity of the second battery when the first switch is turned on, the second switch is not turned on, and the first battery is subjected to a high-load pumping by the load device;
when the difference between the first battery capacity and the second battery capacity is smaller than a first preset value, the load device is reduced from the high load to a low load;
comparing a first voltage of the first battery with a second voltage of the second battery in a state where the first battery is subjected to the load by the load device at the low load;
when the difference between the first voltage and the second voltage is smaller than a second preset value, the second switch is turned on, so that the first battery and the second battery are both subjected to load extraction by the load device; and
the load device is raised from the low load to the high load to drain the first battery and the second battery.
2. The control method according to claim 1, wherein the load device is pumped at a first current or a first power for the high load, and at a second current or a second power for the low load, wherein the first current is greater than the second current, and the first power is greater than the second power.
3. The control method according to claim 1, wherein when the second switch is turned on, the load device is raised from the low load to a maximum load to drain the first battery and the second battery, the load device is drained at the high load by a first current or a first power, and the load device is drained at the maximum load by a third current or a third power, wherein the third current is greater than the first current, and the third power is greater than the first power.
4. The control method of claim 1, wherein the load system further comprises a control unit that compares the first battery level of the first battery and the second battery level of the second battery, compares the first voltage of the first battery and the second voltage of the second battery.
5. The control method according to claim 4, wherein the control unit is constituted by a battery management system of the first battery and the second battery, the control unit further controlling the load device to be lowered from the high load to the low load and controlling the load device to be raised from the low load to the high load.
6. The control method of claim 5, wherein the control unit further turns on the second switch such that both the first battery and the second battery are drained by the load device.
7. The control method according to claim 4, wherein the control unit is included in the load device, the control unit further controlling the load device to be lowered from the high load to the low load and controlling the load device to be raised from the low load to the high load.
8. The control method of claim 7, wherein the control unit further turns on the second switch such that both the first battery and the second battery are drained by the load device.
9. The control method of claim 1, wherein the load system further comprises a charging device, the first switch is connected in series between the first battery and the charging device, and the second switch is connected in series between the second battery and the charging device, the control method further comprising the steps of:
comparing the first battery charge of the first battery with the second battery charge of the second battery in a state where the first switch is turned on, the second switch is not turned on, and the first battery is charged by the charging device with a first current;
when the difference between the first battery capacity and the second battery capacity is smaller than the first preset value, the charging device changes the first current into a second current to charge the first battery;
comparing the first voltage of the first battery and the second voltage of the second battery in a state where the first battery is charged with the second current by the charging device;
when the difference between the first voltage and the second voltage is smaller than the second preset value, turning on the second switch to enable the first battery and the second battery to be charged by the charging device; and
the charging device changes from the second current to the first current to charge the first battery and the second battery;
wherein the first current is greater than the second current.
10. The control method of claim 9, wherein the charging device is raised from the second current to a maximum current to charge the first battery and the second battery when the second switch is turned on, wherein the maximum current is greater than the first current.
11. The control method of claim 9, wherein the load system further comprises a control unit that compares the first battery level of the first battery and the second battery level of the second battery, compares the first voltage of the first battery and the second voltage of the second battery.
12. The control method according to claim 11, wherein the control unit is constituted by a battery management system of the first battery and the second battery, the control unit further controlling the charging device to change from the first current to the second current and controlling the charging device to change from the second current to the first current.
13. The control method of claim 12, wherein the control unit further turns on the second switch, so that both the first battery and the second battery are charged by the charging device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610685673.4A CN107769279B (en) | 2016-08-18 | 2016-08-18 | Control method for parallel connection and lap joint of batteries |
| TW106128028A TWI634722B (en) | 2016-08-18 | 2017-08-18 | Control method for battery parallel connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610685673.4A CN107769279B (en) | 2016-08-18 | 2016-08-18 | Control method for parallel connection and lap joint of batteries |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107769279A CN107769279A (en) | 2018-03-06 |
| CN107769279B true CN107769279B (en) | 2020-11-17 |
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| KR102361334B1 (en) | 2018-05-09 | 2022-02-09 | 주식회사 엘지에너지솔루션 | Battery control apparatus, and energy storage system including the same |
| CN110429351B (en) * | 2019-06-17 | 2021-07-20 | 深圳市华宝新能源股份有限公司 | Battery management method and battery management device |
| US20230307925A1 (en) * | 2020-07-28 | 2023-09-28 | Panasonic Intellectual Property Management Co., Ltd. | Management device, power supply system, electrically driven moving body, and management method |
| CN112798968B (en) * | 2020-12-24 | 2024-07-23 | 重庆峘能电动车科技有限公司 | Method for estimating SOC of battery parallel system, electric equipment and medium |
| CN117996929A (en) * | 2022-10-31 | 2024-05-07 | 上海派能能源科技股份有限公司 | Master-slave linkage capacity expansion method and device for mobile battery |
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| CN205141742U (en) * | 2015-11-16 | 2016-04-06 | 深圳市智锂能源科技有限公司 | Large capacity battery access system that connects in parallel |
| JP2016059124A (en) * | 2014-09-08 | 2016-04-21 | トヨタ自動車株式会社 | vehicle |
| CN105846489A (en) * | 2015-01-30 | 2016-08-10 | 三星Sdi株式会社 | Battery charge and discharge control system and battery charge and discharge control method |
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| TW201138267A (en) * | 2010-04-23 | 2011-11-01 | Neoton Optoelectronics Corp | Current balancing device for parallel batteries and controlling method thereof |
| TWI406472B (en) * | 2010-04-30 | 2013-08-21 | Simplo Technology Co Ltd | A method for discharging a battery apparatus |
| TW201214919A (en) * | 2010-09-24 | 2012-04-01 | Lite On Clean Energy Technology Corp | Hybrid battery module and battery management method |
| GB201216127D0 (en) * | 2012-09-11 | 2012-10-24 | Jaguar Cars | A method for determining the change in a vehicle battery |
| CN203027010U (en) * | 2012-11-30 | 2013-06-26 | 北汽福田汽车股份有限公司 | Double-storage-battery system used for vehicle |
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| JP2016059124A (en) * | 2014-09-08 | 2016-04-21 | トヨタ自動車株式会社 | vehicle |
| CN105846489A (en) * | 2015-01-30 | 2016-08-10 | 三星Sdi株式会社 | Battery charge and discharge control system and battery charge and discharge control method |
| CN205141742U (en) * | 2015-11-16 | 2016-04-06 | 深圳市智锂能源科技有限公司 | Large capacity battery access system that connects in parallel |
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