CN109980713B - Voltage conversion control device of power battery and control method thereof - Google Patents
Voltage conversion control device of power battery and control method thereof Download PDFInfo
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- CN109980713B CN109980713B CN201811570224.0A CN201811570224A CN109980713B CN 109980713 B CN109980713 B CN 109980713B CN 201811570224 A CN201811570224 A CN 201811570224A CN 109980713 B CN109980713 B CN 109980713B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000007599 discharging Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims description 48
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000004044 response Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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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- H02J7/0022—
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- H02J7/0026—
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to a voltage conversion control device of a power battery and a control method thereof, belonging to the technical field of electric automobiles. The invention discloses a voltage conversion control device, which comprises a control unit and a voltage conversion control circuit; the voltage conversion control circuit includes: a first circuit module including a first controllable power switch and a second controllable power switch provided corresponding to a first battery unit of the power battery assembly, a second circuit module including a third controllable power switch and a fourth controllable power switch provided corresponding to a second battery unit of the power battery assembly, and a fifth controllable power switch; the control unit is used for controlling the switching action of the controllable power switch of the voltage conversion control circuit according to the charging voltage accessed by the charging input end and the discharging voltage required to be output by the discharging output end so as to realize the switchable charging input/discharging output of the plurality of battery units between the parallel connection form and the serial connection form. The device and the method have good compatibility.
Description
Technical Field
The invention belongs to the technical field of electric automobiles, and relates to a voltage conversion control device and a control method of a power battery.
Background
With implementation of national new energy strategy, electric vehicles are increasingly accepted by consumers, and China is becoming the largest electric vehicle market worldwide.
In order to meet the charging convenience of the electric automobile and realize the standardization of charging, the related standards prescribe the voltage of a voltage platform of the electric automobile and the charging voltage of a charging system, for example, the current domestic electric passenger car type is mainly a 400V voltage platform, a battery, a motor and related systems are all based on 400V as a basic voltage platform, and the 400V voltage platform is widely used by domestic and foreign electric automobile manufacturers because of the abundant and mature resources of the used domestic motor, electric control, charging and other parts.
However, as the requirements of electric vehicles for endurance mileage increase, the battery capacity increases. The charging time becomes longer and longer, and even the charging time is prolonged to 8-10 hours in a slow charging mode, so that the user experience is seriously affected, and the charging power of a 400V voltage platform is restricted due to the heating of a high-voltage wire harness and the limitation of the 400V voltage platform.
In this case, in order to reduce the charging time, the electric vehicle with a large battery capacity needs to increase the charging power, which includes both increasing the charging current and increasing the charging voltage. Lifting the charging current requires solving the problem of high current heating, and a separate water cooling device is required to be arranged, so that the charging harness is heavy. A voltage platform with higher voltage, such as an 800V voltage platform, has appeared in the national standard, and under the same current condition, the charging power of the 800V voltage platform is twice that of the 400V voltage platform, so that the charging time can be shortened. Although the 800V voltage platform can effectively reduce the charging time, a 400V charging system is mainly adopted in the current market, so that an electric automobile with the 800V voltage platform cannot use the existing main current charging equipment, and charging difficulty and inconvenience are easily caused. Meanwhile, with the application of more 800V charging equipment, an electric automobile with a 400V voltage platform cannot use the 800V charging equipment, so that the charging is inconvenient.
In addition, during the discharging process, the power battery assembly cannot realize discharging of parts such as a motor compatible with different voltage platforms (for example, 400V and 800V).
Disclosure of Invention
The invention aims to improve the compatibility of an electric automobile in terms of charging input and/or discharging output.
According to an aspect of the present invention, there is provided a voltage conversion control device of a power battery, the voltage conversion control device including a control unit and a voltage conversion control circuit disposed between a power battery assembly and a charge input/discharge output of an electric vehicle;
wherein the voltage conversion control circuit includes:
the first circuit module is arranged corresponding to the first battery unit of the power battery assembly and comprises a first controllable power switch and a second controllable power switch, wherein two ends of the first controllable power switch are respectively and electrically connected to a first end of a charging input end/discharging output end and a first end of the first battery unit, and two ends of the second controllable power switch are respectively and electrically connected to a second end of the charging input end/discharging output end and a second end of the first battery unit;
A second circuit module including a third controllable power switch and a fourth controllable power switch, which are disposed corresponding to the second battery unit of the power battery assembly, wherein two ends of the third controllable power switch are respectively electrically connected to the first end of the charge input/discharge output terminal and the first end of the second battery unit, and two ends of the fourth controllable power switch are respectively electrically connected to the second end of the charge input/discharge output terminal and the second end of the second battery unit, and the first battery unit and the second battery unit have the same standard voltage; and
A fifth controllable power switch, two ends of which are respectively electrically connected to the second end of the first battery unit and the first end of the second battery unit;
The control unit is used for controlling the switching actions of the first controllable power switch, the second controllable power switch, the third controllable power switch, the fourth controllable power switch and the fifth controllable power switch according to the charging voltage accessed by the charging input end/the discharging voltage required to be output by the discharging output end, so that the first battery unit and the second battery unit can be used for charging input/discharging output in a convertible mode between a parallel mode and a serial mode.
According to the voltage conversion control device of the embodiment of the invention, a pre-charging branch circuit is further arranged in the first circuit module, the pre-charging branch circuit comprises a pre-charging controllable power switch and a pre-charging current-limiting resistor which are electrically connected in series, and the pre-charging branch circuit is connected in parallel relative to the first controllable power switch.
According to a further embodiment of the present invention or any of the preceding embodiments, a parallel balancing branch is further provided in the second circuit module, the parallel balancing branch comprising a balanced controllable power switch and a balanced current limiting resistor electrically connected together in series, the parallel balancing branch being connected in parallel with respect to the third controllable power switch.
According to still another embodiment of the present invention or the voltage conversion control device of any one of the preceding embodiments, wherein when the magnitude of the charging voltage/amplifying voltage is equal to the standard voltage, the control unit controls the fifth controllable power switch to be opened and controls the first controllable power switch, the second controllable power switch, the third controllable power switch and the fourth controllable power switch to be closed, so as to enable the first battery unit and the second battery unit to perform charging input/discharging output equal to the standard voltage in parallel.
According to still another embodiment of the present invention or the voltage conversion control device of any one of the preceding embodiments, wherein when the magnitude of the charging voltage/amplifying voltage is 2 times the standard voltage, the control unit controls the fifth controllable power switch to be closed and controls the first controllable power switch and the fourth controllable power switch to be closed, the second controllable power switch and the third controllable power switch to be opened, so that the first battery unit and the second battery unit perform charging input/discharging output equal to 2 times the standard voltage in a serial form.
According to a further embodiment of the present invention or the voltage conversion control device according to any one of the preceding embodiments, the control unit controls the first and third controllable power switches to be opened and controls the pre-charge controllable power switch to be closed to perform a pre-charge process of a capacitor on the electric vehicle before the charging input is performed.
According to a further embodiment of the present invention or the voltage conversion control device of any of the preceding embodiments, wherein the control unit controls the fifth controllable power switch and the third controllable power switch to be opened and controls the first controllable power switch, the second controllable power switch, the balancing controllable power switch and the fourth controllable power switch to be closed to perform a parallel voltage balancing process between the first battery cell and the second battery cell before performing the charging input in parallel.
According to a further embodiment of the present invention or the voltage conversion control apparatus according to any one of the preceding embodiments, the control unit is further configured to control switching actions of the first controllable power switch, the second controllable power switch, the third controllable power switch, the fourth controllable power switch and the fifth controllable power switch according to fault information of the first battery unit and the second battery unit, so as to realize selection of at least one of the first battery unit and the second battery unit for discharge output.
According to still another embodiment of the present invention or the voltage conversion control apparatus of any one of the preceding embodiments, wherein when one of the first battery cell and the second battery cell fails, the control unit controls the fifth controllable power switch to be turned off, and controls the first controllable power switch and the second controllable power switch in the first circuit module corresponding to the failed first battery cell to be turned off, or controls the third controllable power switch and the fourth controllable power switch in the second circuit module corresponding to the failed second battery cell to be turned off.
According to a further embodiment of the present invention or the voltage conversion control device according to any of the preceding embodiments, the first controllable power switch, the second controllable power switch, the third controllable power switch, the fourth controllable power switch and the fifth controllable power switch are relays.
According to a further embodiment of the present invention or the voltage conversion control device of any of the preceding embodiments, the standard voltage is equal to 400V.
According to still another aspect of the present invention, there is provided a control method of the aforementioned voltage conversion control apparatus, comprising the steps of:
S10: in response to the magnitude of the charging voltage/amplified voltage being equal to the standard voltage, controlling the fifth controllable power switch to be opened and controlling the first, second, third and fourth controllable power switches to be closed so as to enable the first and second battery cells to perform charging input/discharging output in parallel, the charging input/discharging output being equal to the standard voltage; and/or
S20: and in response to the magnitude of the charging voltage/amplified voltage being equal to 2 times the standard voltage, controlling the fifth controllable power switch to be closed, and controlling the first controllable power switch and the fourth controllable power switch to be closed, and controlling the second controllable power switch and the third controllable power switch to be opened so as to realize that the first battery unit and the second battery unit perform charging input/discharging output which is equal to 2 times the standard voltage in a serial connection mode.
According to the control method of the embodiment of the invention, a pre-charging branch circuit is further arranged in the first circuit module, the pre-charging branch circuit comprises a pre-charging controllable power switch and a pre-charging current limiting resistor which are electrically connected together in series, and the pre-charging branch circuit is connected in parallel relative to the first controllable power switch;
The second circuit module is also provided with a parallel balance branch circuit, the parallel balance branch circuit comprises a balance controllable power switch and a balance current limiting resistor which are electrically connected together in series, and the parallel balance branch circuit is connected in parallel relative to the third controllable power switch;
Wherein, the step S10 includes:
controlling the first controllable power switch, the fifth controllable power switch, the third controllable power switch and the fourth controllable power switch to be opened, controlling the pre-charging controllable power switch and the second controllable power switch to be closed, and performing a pre-charging process of a capacitor on the electric automobile; and
Controlling the pre-charge controllable power switch and the third controllable power switch to be opened, controlling the first controllable power switch, the balance controllable power switch and the fourth controllable power switch to be closed, and performing a parallel voltage balancing process between the first battery unit and the second battery unit;
and controlling the balance controllable power switch to be opened and controlling the third controllable power switch to be closed, and carrying out charging input equal to the standard voltage in a parallel connection mode.
According to a further embodiment of the present invention or the control method of any one of the preceding embodiments, a pre-charge branch is further provided in the first circuit module, the pre-charge branch comprising a pre-charge controllable power switch and a pre-charge current limiting resistor electrically connected together in series, the pre-charge branch being connected in parallel with respect to the first controllable power switch;
wherein, the step S20 includes:
Controlling the first controllable power switch, the second controllable power switch and the third controllable power switch to be opened, controlling the pre-charging controllable power switch, the fifth controllable power switch and the fourth controllable power switch to be closed, and performing a pre-charging process of a capacitor on the electric automobile; and
And controlling the pre-charge controllable power switch to be opened and controlling the first controllable power switch to be closed, and performing discharging output which is equal to 2 times of the standard voltage in a serial form.
According to a further embodiment of the present invention or the control method of any one of the preceding embodiments, a pre-charge branch is further provided in the first circuit module, the pre-charge branch comprising a pre-charge controllable power switch and a pre-charge current limiting resistor electrically connected together in series, the pre-charge branch being connected in parallel with respect to the first controllable power switch;
Wherein, the step S10 includes:
controlling the first controllable power switch, the fifth controllable power switch, the third controllable power switch and the fourth controllable power switch to be opened, controlling the pre-charging controllable power switch and the second controllable power switch to be closed, and performing a pre-charging process of a capacitor on the electric automobile; and
And controlling the pre-charge controllable power switch to be opened, controlling the first controllable power switch, the third controllable power switch and the fourth controllable power switch to be closed, and performing discharge output equal to the standard voltage in a parallel mode.
According to still another embodiment of the present invention or the control method according to any of the foregoing embodiments, the control method further includes the steps of:
And S30, when one of the first battery unit and the second battery unit fails, controlling the fifth controllable power switch to be turned off, and controlling the first controllable power switch and the second controllable power switch in the first circuit module corresponding to the failed first battery unit to be turned off, or controlling the third controllable power switch and the fourth controllable power switch in the second circuit module corresponding to the failed second battery unit to be turned off.
According to still another aspect of the present invention, there is provided an electric vehicle including:
A power cell assembly;
a charge input/discharge output; and
Any one of the foregoing voltage conversion control devices.
The above features and operation of the present invention will become more apparent from the following description and the accompanying drawings.
Drawings
The above and other objects and advantages of the present invention will become more fully apparent from the following detailed description taken in conjunction with the accompanying drawings, in which identical or similar elements are designated by the same reference numerals.
Fig. 1 is a schematic configuration diagram of a voltage conversion control apparatus of a power battery according to an embodiment of the present invention.
Fig. 2 is a schematic diagram for controlling the voltage conversion control apparatus shown in fig. 1 to perform a 400V charging process, in which an equivalent circuit diagram of the voltage conversion control apparatus during the charging process is shown.
Fig. 3 is a schematic diagram for controlling the voltage conversion control apparatus shown in fig. 1 to perform an 800V charging process, in which an equivalent circuit diagram of the voltage conversion control apparatus during the charging process is shown.
Fig. 4 is a schematic structural view of a voltage conversion control apparatus of a power battery according to still another embodiment of the present invention.
Fig. 5 is a schematic diagram for controlling the voltage conversion control apparatus shown in fig. 4 to perform an 800V discharge process, wherein an equivalent circuit diagram of the voltage conversion control apparatus during the discharge process is shown.
Fig. 6 is a schematic diagram for controlling the voltage conversion control apparatus shown in fig. 4 to perform a 400V discharge process, in which an equivalent circuit diagram of the voltage conversion control apparatus during the discharge process is shown.
Fig. 7 is a schematic diagram for controlling the voltage conversion control apparatus shown in fig. 4 to perform a 400V discharge process, wherein an equivalent circuit diagram of the voltage conversion control apparatus during the discharge process is shown.
Detailed Description
In the following description, reference is made to the accompanying drawings, which illustrate specific exemplary embodiments. Electrical, logical and structural modifications may be made to these embodiments without departing from the spirit and scope of the present invention. Furthermore, while a feature of the invention may have been disclosed with respect to only one of several implementations/embodiments, such feature may be combined with one or more other features of the other implementations/embodiments, as may be desired and/or advantageous for any given or identifiable function. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims and their equivalents.
The terms "first," "second," and the like, when used herein, do not necessarily denote any order or priority, but rather may be used to more clearly distinguish one element from another.
It will be understood that when an element is referred to as being "electrically connected" or "coupled" to another element, it can be directly electrically connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly coupled" or "directly electrically connected" to another element, there are no intervening elements present.
Herein, an electric vehicle is a vehicle using a power battery as an energy pack for driving the vehicle to travel, and includes various types of electric vehicles such as a pure electric vehicle and a hybrid electric vehicle, and a voltage platform of the electric vehicle may be defined by a highest voltage output from the power battery. In the following examples, a 400V voltage platform and an 800V voltage platform are illustrated, but it should be understood that the specific voltage magnitudes of the individual voltage platforms are not limiting, as different voltage magnitudes may be specified in standards of different countries/regions.
In the voltage conversion control device of the power battery used on the electric vehicle of the following embodiment, the voltage conversion control device is provided corresponding to the power battery assembly 10 of the electric vehicle, and for example, it may be disposed in the vicinity of the power battery assembly 10. Taking the example that the power battery assembly 10 includes the first battery cell 11 and the second battery cell 12, they have substantially the same standard voltage V, for example, v=400V, so that the first battery cell 11 and the second battery cell 12 are adapted to be charged at a voltage of 400V when the power battery assembly 10 is charged.
It will be appreciated that the specific structure and form of the power battery assembly 10 is not limiting, and for example, it may include more battery cells like the first battery cell 11 or the second battery cell 12, and in the case where the number of battery cells increases, the internal circuit of the voltage conversion control device may be correspondingly expanded and arranged. The first battery cell 11 and the second battery cell 12 may be, for example, battery packs, which have the same structure.
Fig. 1 is a schematic view showing a structure of a voltage conversion control apparatus of a power battery according to an embodiment of the present invention.
As shown in fig. 1, the voltage conversion control apparatus 20 includes a voltage conversion control circuit 200, which is disposed between the power battery assembly 10 and the charging input terminal 30 of the electric vehicle according to an embodiment of the present invention, the charging input terminal 30 may be, for example, a charging interface or the like capable of being engaged with an external standard charging device (for example, a charging post or the like, not shown in the drawing), and the charging input terminal 30 may be provided according to a corresponding charging standard or the like.
In an embodiment, the voltage conversion control circuit 200 includes a first circuit module disposed corresponding to the first battery cell 11 of the power battery assembly 10, the first circuit module including a first controllable power switch 211 and a second controllable power switch 216, wherein both ends of the first controllable power switch 211 are electrically connected to the positive terminal (+) of the charging input terminal 30 and the positive terminal (+) of the first battery cell 11, respectively, and both ends of the second controllable power switch 216 are electrically connected to the negative terminal (-) of the charging input terminal 30 and the negative terminal (-) of the first battery cell 11, respectively.
The first circuit module may further be provided with a precharge branch comprising a precharge controllable power switch 213 and a precharge current limiting resistor 212 electrically connected together in series, the precharge branch being connected in parallel with respect to the first controllable power switch 211, that is, the precharge controllable power switch 213 and the precharge current limiting resistor 212 being arranged in parallel with respect to the first controllable power switch 211.
Specifically, a fuse 214 may be further disposed in the first circuit module to ensure charge and discharge safety, for example, one end of the first controllable power switch 211 is indirectly electrically connected to the positive end of the first battery unit 11 through the fuse 214. A current sensor 215 may also be provided in the first circuit module for detecting the magnitude of the loop current on the first circuit module. The first circuit module may also be provided with reflow strips, harness components, etc., as desired.
As further shown in fig. 1, the voltage conversion control circuit 200 further includes a second circuit module disposed corresponding to the second battery cell 12 of the power battery assembly 10, the second circuit module including a third controllable power switch 231 and a fourth controllable power switch 236, wherein both ends of the third controllable power switch 231 are electrically connected to the positive terminal (+) of the charging input terminal 30 and the positive terminal (+) of the second battery cell 12, respectively, and both ends of the fourth controllable power switch 236 are electrically connected to the negative terminal (-) of the charging input terminal 30 and the negative terminal (-) of the second battery cell 12, respectively.
A parallel balancing branch is also provided in the second circuit module, which comprises a balancing controllable power switch 233 and a balancing current limiting resistor 232 electrically connected together in series, which parallel balancing branch is connected in parallel with respect to the third controllable power switch 231, i.e. the balancing controllable power switch 233 and the balancing current limiting resistor 232 are arranged in parallel with respect to the third controllable power switch 231.
Specifically, a fuse 234 may be further disposed in the second circuit module to ensure charge and discharge safety, for example, one end of the third controllable power switch 231 is indirectly electrically connected to the positive end of the second battery unit 12 through the fuse 234. A current sensor 235 may also be provided in the second circuit module for detecting the magnitude of the loop current on the second circuit module. The second circuit module may also be provided with reflow strips, harness components, etc., as desired.
As further shown in fig. 1, the voltage conversion control circuit 200 further includes a fifth controllable power switch 220, and both ends of the fifth controllable power switch 220 are electrically connected to the negative terminal (-) of the first battery cell 11 and the positive terminal (+) of the second battery cell 12, respectively, that is, the fifth controllable power switch 220 is disposed between the first circuit module and the second circuit module.
Specifically, the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231, the fourth controllable power switch 236, and the fifth controllable power switch 220 may be, but are not limited to, relays.
As further shown in fig. 1, the voltage conversion control apparatus 20 further includes a control unit 240, where the control unit 240 is a functional entity that may be implemented in software and/or hardware, and the control unit 240 may be implemented by a processor, a microcontroller, or the like, for example. Specifically, the control unit 240 may be implemented in a BMS (battery management system). The controllable power switches in the voltage conversion control circuit 200 may all be controlled by the control unit 240, for example, the switching actions (e.g., opening and closing) of the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231, the fourth controllable power switch 236, and the fifth controllable power switch 220 may be controlled by the control unit 240. The control unit 240 may be coupled to the charging input 30 such that charging voltage information, in particular the charging voltage level, of the external charging device to which it is coupled may be known from the charging input 30.
For example, when the charging input terminal 30 engages a charging peg having a charging voltage equal to 400V, the control unit 240 may receive charging voltage information of 400V; when the charging input terminal 30 is engaged with the charging post having the charging voltage equal to 800V, the control unit 240 may receive charging voltage information of 800V.
The control unit 240 may be configured to: the switching actions of the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231, the fourth controllable power switch 236 and the fifth controllable power switch 220 are controlled according to the magnitude of the charging voltage connected to the charging input terminal 30, so as to realize the switchable charging input of the first battery unit 11 and the second battery unit 12 between the parallel connection form and the serial connection form.
Fig. 2 is a schematic diagram showing a process of controlling the voltage conversion control apparatus shown in fig. 1 to perform 400V charging, wherein an equivalent circuit diagram of the voltage conversion control apparatus during charging is shown; fig. 3 is a schematic diagram showing a process of controlling the voltage conversion control apparatus shown in fig. 1 to perform 800V charging, in which an equivalent circuit diagram of the voltage conversion control apparatus during charging is shown. The control method of the voltage conversion control apparatus 20 is exemplified below with reference to fig. 1 to 3, and the operation principle thereof is also explained.
Assuming that the charging input terminal 30 is a charging post to which a charging voltage equal to 400V is connected, the voltage conversion control device 20 needs to be switched to a parallel form for charging input, so as to be compatible with external charging equipment.
As shown in fig. 2 (a), in an embodiment, the control unit 240 controls the fifth controllable power switch 220 to be opened, also controls the first controllable power switch 211 to be opened, the third controllable power switch (231) and the fourth controllable power switch 236 to be opened, and controls the pre-charge controllable power switch 213 and the second controllable power switch 216 to be closed, so that a pre-charge process of the capacitor on the electric vehicle can be performed. The current flow of the precharge process is seen by the dashed arrow in the equivalent circuit of fig. 2 (a).
After the precharge for a predetermined time, as shown in fig. 2 (b), the precharge controllable power switch 213 and the third controllable power switch 231 are controlled to be opened, and the first controllable power switch 211, the balance controllable power switch 233 and the fourth controllable power switch 236 are controlled to be closed, a parallel voltage equalization process between the first battery cell 11 and the second battery cell 12 is performed, thereby achieving voltage equalization between the first battery cell 11 and the second battery cell 12 before the charge. The current trend during the voltage equalization is uncertain and is related to the present voltage level of the first battery cell 11 and the second battery cell 12.
Therefore, by balancing the controllable power switch 233 and the parallel voltage balancing process thereof, the charging conditions of the two parts of batteries (the first battery unit 11 and the second battery unit 12) can be balanced, the adverse effects on the battery and the whole vehicle endurance mileage due to different charging conditions of the two parts of batteries can be solved, and the effects on the energy and the reliability of the power battery can be reduced.
After the voltage balancing process, as shown in fig. 2 (c), the balance controllable power switch 233 is controlled to be opened and the third controllable power switch 231 is controlled to be closed, at this time, the first circuit module and the first battery cell 11, the second circuit module and the second battery cell 21 electrically connected thereto are all connected in parallel to the charging input terminal 30, so that the charging input of 400V is performed by the first battery cell 11 and the second battery cell 12 in parallel. The current flow of the charge input process is seen by the dashed arrow in the equivalent circuit of fig. 2 (c).
Therefore, when the charging pile with the charging voltage equal to 400V is engaged, the electric vehicle according to an embodiment of the present invention can realize compatibility with the external charging pile through the voltage conversion control device 20 even if the electric vehicle is an electric vehicle with a 800V voltage platform.
Assuming that the charging input terminal 30 is a charging post to which a charging voltage equal to 800V is connected, the voltage conversion control device 20 needs to be switched to a serial form for charging input, so as to be compatible with external charging equipment.
As shown in fig. 3 (a), the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231 are controlled to be opened, the pre-charge controllable power switch 213, the fifth controllable power switch 220 and the fourth controllable power switch 236 are controlled to be closed, and a pre-charging process of a capacitor on the electric automobile is performed, so that the pre-charging process of the capacitor on the electric automobile can be performed. The current flow of the precharge process is seen by the dashed arrow in the equivalent circuit of fig. 3 (a).
After the precharge for a predetermined time, as shown in fig. 3 (b), the precharge controllable power switch 213 is controlled to be opened and the first controllable power switch 211 is controlled to be closed, at this time, the first circuit module and the first battery cell 11, the second circuit module and the second battery cell 21 electrically connected thereto are all connected in series with the charge input terminal 30, thereby realizing 800V charge input of the first battery cell 11 and the second battery cell 12 in series; and for each cell it is charged at about 400V. The current flow of the charge input process is seen by the dashed arrow in the equivalent circuit of fig. 3 (b).
Therefore, when the charging pile with the charging voltage equal to 800V is engaged, the electric vehicle according to an embodiment of the present invention can realize compatibility with the external charging pile through the voltage conversion control device 20 even if the electric vehicle is an electric vehicle with a 400V voltage platform.
The voltage conversion control device 20 and the control method thereof can automatically realize that the electric automobile of the voltage platform can be compatible with external charging equipment with different charging voltages, particularly can effectively solve the problems of incompatibility and unbalance of the charging requirement of the electric automobile of the 800V voltage platform and the existing main current charging resources, and are simple to realize and low in cost.
Fig. 4 is a schematic view showing a structure of a voltage conversion control apparatus of a power battery according to still another embodiment of the present invention.
As shown in fig. 4, the voltage conversion control device 40 includes a voltage conversion control circuit 200 that is disposed between the power battery module 10 and the discharge output 50 of the electric vehicle according to an embodiment of the present invention, and the discharge output 50 may be, for example, a discharge interface or the like that can be engaged with a component such as a motor, and the discharge output 50 may obtain, for example, a standard operating voltage level of the component such as a current motor or a voltage platform level of the electric vehicle from a VCU (vehicle control unit) or the like as discharge voltage information.
In an embodiment, the voltage conversion control circuit 200 includes a first circuit module disposed corresponding to the first battery cell 11 of the power battery assembly 10, the first circuit module including a first controllable power switch 211 and a second controllable power switch 216, wherein both ends of the first controllable power switch 211 are electrically connected to the positive terminal (+) of the discharge output terminal 50 and the positive terminal (+) of the first battery cell 11, respectively, and both ends of the second controllable power switch 216 are electrically connected to the negative terminal (-) of the discharge output terminal 50 and the negative terminal (-) of the first battery cell 11, respectively.
The first circuit module may further be provided with a precharge branch comprising a precharge controllable power switch 213 and a precharge current limiting resistor 212 electrically connected together in series, the precharge branch being connected in parallel with respect to the first controllable power switch 211, that is, the precharge controllable power switch 213 and the precharge current limiting resistor 212 being arranged in parallel with respect to the first controllable power switch 211.
Specifically, a fuse 214 may be further disposed in the first circuit module to ensure charge and discharge safety, for example, one end of the first controllable power switch 211 is indirectly electrically connected to the positive end of the first battery unit 11 through the fuse 214. A current sensor 215 may also be provided in the first circuit module for detecting the magnitude of the loop current on the first circuit module. The first circuit module may also be provided with reflow strips, harness components, etc., as desired.
As further shown in fig. 4, the voltage conversion control circuit 200 further includes a second circuit module disposed corresponding to the second battery cell 12 of the power battery assembly 10, the second circuit module including a third controllable power switch 231 and a fourth controllable power switch 236, wherein both ends of the third controllable power switch 231 are electrically connected to the positive terminal (+) of the discharge output terminal 50 and the positive terminal (+) of the second battery cell 12, respectively, and both ends of the fourth controllable power switch 236 are electrically connected to the negative terminal (-) of the discharge output terminal 50 and the negative terminal (-) of the second battery cell 11, respectively.
Specifically, a fuse 234 may be further disposed in the second circuit module to ensure charge and discharge safety, for example, one end of the third controllable power switch 231 is indirectly electrically connected to the positive end of the second battery unit 12 through the fuse 234. A current sensor 235 may also be provided in the second circuit module for detecting the magnitude of the loop current on the second circuit module. The second circuit module may also be provided with reflow strips, harness components, etc., as desired.
As further shown in fig. 4, the voltage conversion control circuit 200 further includes a fifth controllable power switch 220, and both ends of the fifth controllable power switch 220 are electrically connected to the negative terminal (-) of the first battery cell 11 and the positive terminal (+) of the second battery cell 12, respectively, that is, the fifth controllable power switch 220 is disposed between the first circuit module and the second circuit module.
Specifically, the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231, the fourth controllable power switch 236, and the fifth controllable power switch 220 may be, but are not limited to, relays.
As further shown in fig. 4, the voltage conversion control apparatus 40 further includes a control unit 440, where the control unit 440 is a functional entity that may be implemented in software and/or hardware, and the control unit 440 may be implemented by a processor, a microcontroller, or the like, for example. Specifically, the control unit 440 may be implemented in a BMS (battery management system). The controllable power switches in the voltage conversion control circuit 200 may all be controlled by the control unit 440, for example, the switching actions (e.g., opening and closing) of the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231, the fourth controllable power switch 236, and the fifth controllable power switch 220 may be controlled by the control unit 440. The control unit 440 may be coupled to the discharge output 50, VCU, etc., so that the magnitude of the discharge voltage required to be output from the discharge output 50 can be obtained.
For example, when the discharge output 50 needs to discharge an electric component (e.g., a motor) of an electric vehicle of a 400V voltage platform, etc., the control unit 440 may receive the discharge voltage information of 400V; when the discharge output 50 needs to discharge an electric component (e.g., a motor) of an electric vehicle with a voltage platform of 800V, the control unit 440 may receive discharge voltage information of 800V.
The control unit 440 may be configured to: the switching actions of the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231, the fourth controllable power switch 236 and the fifth controllable power switch 220 are controlled according to the magnitude of the discharge voltage connected to the discharge output terminal 50, so as to realize the switchable discharge output of the first battery unit 11 and the second battery unit 12 between the parallel connection form and the series connection form.
In an embodiment, as further shown in fig. 4, the voltage conversion control device 40 may further implement selecting a corresponding battery cell to perform the discharging operation according to the fault information of the battery cell. The control unit 440 is capable of obtaining fault information of each battery unit, and the control unit 440 is further configured to control the switching actions of the first controllable power switch 211, the second controllable power switch 216, the third controllable power switch 231, the fourth controllable power switch 236 and the fifth controllable power switch 220 according to the fault information of the first battery unit 11 and the second battery unit 12, so as to realize the selection of at least one of the first battery unit 11 and the second battery unit 12 (for example, to exclude the battery unit with the fault from the discharge output).
The control method of the voltage conversion control device 40 is exemplified below with reference to fig. 4 to 7, and the operation principle thereof is also explained.
Fig. 5 is a schematic diagram showing a process of controlling the voltage conversion control apparatus shown in fig. 4 to perform 800V discharge, wherein an equivalent circuit diagram of the voltage conversion control apparatus during the discharge process is shown.
As shown in fig. 5, it is assumed that the discharge output terminal 50 to which the voltage conversion control device 40 is coupled is required to output a voltage of 800V for a motor or the like on a 800V voltage platform, and the following operation is performed in response to the requirement.
In an embodiment, the first controllable power switch 211, the second controllable power switch 216, and the third controllable power switch 231 are controlled to be opened, and the pre-charge controllable power switch 213, the fifth controllable power switch 220, and the fourth controllable power switch 236 are controlled to be closed, so as to perform a pre-charge process of the capacitor on the electric vehicle.
Then, as shown in fig. 5, the pre-charge controllable power switch 213 is controlled to be opened, the first controllable power switch 211 is controlled to be closed, and 800V discharge output is performed in a series connection manner; at this time, the first circuit module and the first battery cell 11, the second circuit module and the second battery cell 21 electrically connected thereto are each connected in series to the discharge output terminal 50, thereby realizing that the first battery cell 11 and the second battery cell 12 perform a discharge output of 800V in series; and for each cell it is discharged at about 400V. The current flow of the discharge output process is seen by the dashed arrow in the equivalent circuit of fig. 5. Fig. 6 is a schematic diagram showing a 400V discharge process performed by the voltage conversion control device shown in fig. 4, in which an equivalent circuit diagram of the voltage conversion control device during the discharge process is shown.
As shown in fig. 6, it is assumed that the discharge output terminal 50 to which the voltage conversion control device 40 is coupled is required to output a voltage of 400V for a motor or the like on a 400V voltage platform, and the following operation is performed in response to the requirement.
First, the first controllable power switch 211, the fifth controllable power switch 220, the third controllable power switch 231 and the fourth controllable power switch 236 are controlled to be opened, the pre-charge controllable power switch 213 and the second controllable power switch 216 are controlled to be closed, and a pre-charge process of a capacitor on the electric automobile is performed.
Further, as shown in fig. 6, the precharge controllable power switch 213 is controlled to be opened, the first controllable power switch 211, the third controllable power switch 231, and the fourth controllable power switch 236 are controlled to be closed, and the discharge output equal to the standard voltage is performed in parallel. At this time, the first circuit module and the first battery cell 11, the second circuit module and the second battery cell 21 electrically connected thereto are all connected in parallel to the discharge output terminal 50, thereby realizing that the first battery cell 11 and the second battery cell 12 perform a discharge output of 400V in parallel; and for each cell it is discharged at about 400V. The current flow of the discharge output process is seen by the dashed arrow in the equivalent circuit of fig. 6.
Note that during the process shown in fig. 6, the fifth controllable power switch 220 remains open.
The voltage conversion control device 40 and the control method thereof in the above examples can automatically realize that the power battery assembly 10 is compatible with electric vehicles with different voltage platforms, and can automatically output voltages with different magnitudes according to, for example, system settings, motor voltage requirements and the like. And the realization is simple and the cost is low.
Fig. 7 is a schematic diagram showing a 400V discharge process performed by the voltage conversion control device shown in fig. 4, in which an equivalent circuit diagram of the voltage conversion control device during the discharge process is shown.
In case of a failure of one of the first battery cell 11 and the second battery cell 12, as shown in fig. 7, assuming that the BMS knows that the second battery cell 12 fails, it is possible to control the fifth controllable power switch 220 to be turned off and to control the third controllable power switch 231 and the fourth controllable power switch 236 in the second circuit module corresponding to the failed second battery cell 12 to be turned off in correspondence to the failed control, and the current flow of the discharging output process is referred to by the dotted arrow in the equivalent circuit of fig. 7. In this way, the second battery cell 12 will be excluded for voltage output, and effective protection of the faulty battery cell can be achieved.
It will be appreciated that similar operations may be performed as well in the event of a failure of the first battery cell 11.
It should be noted that, since the first battery cell 11 and the second battery cell 12 may be identical components, the arrangement (e.g., the first circuit module) and the operation for the first battery cell 11 in the above embodiment may be applied to the second battery cell 12 in the same manner, and the arrangement (e.g., the second circuit module) and the operation for the second battery cell 12 may be applied to the first battery cell 11 in the same manner.
The above examples mainly describe the voltage conversion control apparatus and various control methods of the present invention. Although only a few embodiments of the present invention have been described, those of ordinary skill in the art will appreciate that the present invention may be implemented in many other forms without departing from the spirit and scope thereof, for example, placing the precharge branch in parallel with the second controllable power switch 216, placing the shunt equalization branch in parallel with the fourth controllable power switch 236, and so forth. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and the invention is intended to cover various modifications and substitutions without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
1. A voltage conversion control device (20, 40) of a power battery, characterized in that the voltage conversion control device (20, 40) comprises a control unit (240,440) and a voltage conversion control circuit (200) arranged between a power battery assembly (10) and a charging input (30)/discharging output (50) of an electric vehicle;
wherein the voltage conversion control circuit (200) includes:
A first circuit module including a first controllable power switch (211) and a second controllable power switch (216) disposed corresponding to the first battery unit (11) of the power battery assembly (10), wherein both ends of the first controllable power switch (211) are electrically connected to the first end (+) of the charge input terminal (30)/the discharge output terminal (50) and the first end (+) of the first battery unit (11), respectively, and both ends of the second controllable power switch (216) are electrically connected to the second end (-) of the charge input terminal (30)/the discharge output terminal (50) and the second end (-) of the first battery unit (11), respectively; a pre-charge branch is further arranged in the first circuit module, the pre-charge branch comprises a pre-charge controllable power switch (213) and a pre-charge current limiting resistor (212) which are electrically connected together in series, and the pre-charge branch is connected in parallel relative to the first controllable power switch (211);
A second circuit module including a third controllable power switch (231) and a fourth controllable power switch (236) disposed corresponding to the second battery cell (12) of the power battery assembly (10), wherein both ends of the third controllable power switch (231) are electrically connected to the first end (+) of the charge input terminal (30)/the discharge output terminal (50) and the first end (+) of the second battery cell (12), respectively, and both ends of the fourth controllable power switch (236) are electrically connected to the second end (-) of the charge input terminal (30)/the discharge output terminal (50) and the second end (-) of the second battery cell (12), respectively, and the first battery cell (11) and the second battery cell (12) have the same standard voltage; a parallel balancing branch is further arranged in the second circuit module, the parallel balancing branch comprises balancing controllable power switches (233) and balancing current limiting resistors (232) which are electrically connected together in series, and the parallel balancing branch is connected in parallel relative to the third controllable power switch (231); and
A fifth controllable power switch (220) having both ends electrically connected to the second end (-) of the first battery cell (11) and the first end (+) of the second battery cell (12), respectively;
The control unit (240,440) is configured to control switching actions of the first controllable power switch (211), the second controllable power switch (216), the third controllable power switch (231), the fourth controllable power switch (236) and the fifth controllable power switch (220) according to a charging voltage value accessed by the charging input end (30) and a discharging voltage value required to be output by the discharging output end (50), so as to implement charging input/discharging output of the first battery unit (11) and the second battery unit (12) in a manner of being switchable between a parallel connection form and a serial connection form,
Wherein the control unit (240,440) is configured to, when the charging input is performed in parallel:
Firstly, controlling the first controllable power switch (211), the fifth controllable power switch (220), the third controllable power switch (231) and the fourth controllable power switch (236) to be opened, and controlling the pre-charging controllable power switch (213) and the second controllable power switch (216) to be closed so as to perform a pre-charging process of a capacitor on the electric automobile;
Then controlling the pre-charge controllable power switch (213) and the third controllable power switch (231) to be opened, and controlling the first controllable power switch (211), the balance controllable power switch (233) and the fourth controllable power switch (236) to be closed, so as to perform a parallel voltage balancing process between the first battery unit (11) and the second battery unit (12);
Finally, the balance controllable power switch (233) is controlled to be opened and the third controllable power switch (231) is controlled to be closed, and the charging input is performed in a parallel mode.
2. The voltage conversion control device (20, 40) according to claim 1, wherein when the magnitude of the charge voltage/discharge voltage is equal to the standard voltage, the control unit (240,440) controls the fifth controllable power switch (220) to be opened and controls the first controllable power switch (211), the second controllable power switch (216), the third controllable power switch (231) and the fourth controllable power switch (236) to be closed, so as to achieve charge input/discharge output of the first battery unit (11) and the second battery unit (12) in parallel connection, which is equal to the standard voltage.
3. The voltage conversion control device (20, 40) according to claim 1, wherein when the magnitude of the charge voltage/discharge voltage is 2 times the standard voltage, the control unit (240,440) controls the fifth controllable power switch (220) to be closed, and controls the first controllable power switch (211) and the fourth controllable power switch (236) to be closed, the second controllable power switch (216) and the third controllable power switch (231) to be opened, so as to realize charge input/discharge output of the first battery unit (11) and the second battery unit (12) equal to 2 times the standard voltage in a serial form.
4. The voltage conversion control device (20, 40) of claim 1, wherein the control unit (240,440) controls the first (211) and third (231) controllable power switches to open and controls the pre-charge controllable power switch (213) to close for a pre-charging process of a capacitor on the electric vehicle before the charging input is made in series.
5. The voltage conversion control device (20, 40) of claim 1, wherein the control unit (240,440) is further configured to control switching actions of the first controllable power switch (211), the second controllable power switch (216), the third controllable power switch (231), the fourth controllable power switch (236) and the fifth controllable power switch (220) according to fault information of the first battery unit (11) and the second battery unit (12) to enable selection of at least one of the first battery unit (11) and the second battery unit (12) for discharge output.
6. The voltage conversion control device (20, 40) according to claim 5, wherein, when one of the first battery unit (11) and the second battery unit (12) fails, the control unit (240,440) controls the fifth controllable power switch (220) to be turned off, and controls the first controllable power switch (211) and the second controllable power switch (216) in the first circuit module corresponding to the failed first battery unit (11) to be turned off, or controls the third controllable power switch (231) and the fourth controllable power switch (236) in the second circuit module corresponding to the failed second battery unit (12) to be turned off.
7. The voltage conversion control device (20, 40) of claim 1, wherein the first controllable power switch (211), the second controllable power switch (216), the third controllable power switch (231), the fourth controllable power switch (236), and the fifth controllable power switch (220) are relays.
8. The voltage conversion control device (20, 40) of claim 1 wherein the standard voltage is equal to 400V.
9. A control method of a voltage conversion control apparatus (20, 40) according to claim 1, comprising the steps of:
S10: controlling the fifth controllable power switch (220) to be opened and controlling the first controllable power switch (211), the second controllable power switch (216), the third controllable power switch (231) and the fourth controllable power switch (236) to be closed in response to the magnitude of the charging voltage/discharging voltage being equal to the standard voltage, so as to enable the first battery unit (11) and the second battery unit (12) to perform charging input/discharging output equal to the standard voltage in parallel; and/or
S20: controlling the fifth controllable power switch (220) to be closed and the first controllable power switch (211) and the fourth controllable power switch (236) to be closed, and the second controllable power switch (216) and the third controllable power switch (231) to be opened in response to the magnitude of the charging voltage/discharging voltage being equal to 2 times the standard voltage, so as to realize charging input/discharging output of the first battery unit (11) and the second battery unit (12) being equal to 2 times the standard voltage in a serial connection;
wherein the step S10 of performing the charging input equal to the standard voltage in parallel includes:
Firstly, controlling the first controllable power switch (211), the fifth controllable power switch (220), the third controllable power switch (231) and the fourth controllable power switch (236) to be opened, and controlling the pre-charging controllable power switch (213) and the second controllable power switch (216) to be closed so as to perform a pre-charging process of a capacitor on the electric automobile;
Then controlling the pre-charge controllable power switch (213) and the third controllable power switch (231) to be opened, and controlling the first controllable power switch (211), the balance controllable power switch (233) and the fourth controllable power switch (236) to be closed, so as to perform a parallel voltage balancing process between the first battery unit (11) and the second battery unit (12);
Finally, the balance controllable power switch (233) is controlled to be opened, and the third controllable power switch (231) is controlled to be closed, and charging input equal to the standard voltage is performed in a parallel mode.
10. The control method according to claim 9, wherein the step S20 of performing discharge output equal to 2 times the standard voltage in series includes:
controlling the first controllable power switch (211), the second controllable power switch (216), the third controllable power switch (231) to be opened, controlling the pre-charging controllable power switch (213), the fifth controllable power switch (220) and the fourth controllable power switch (236) to be closed, and performing a pre-charging process of a capacitor on the electric automobile; and
-Controlling the pre-charge controllable power switch (213) to open, -controlling the first controllable power switch (211) to close, -performing a discharge output in series equal to 2 times the standard voltage.
11. The control method according to claim 9, wherein the step S10 of performing the discharge output of the standard voltage in parallel includes:
Controlling the first controllable power switch (211), the fifth controllable power switch (220), the third controllable power switch (231) and the fourth controllable power switch (236) to be opened, controlling the pre-charging controllable power switch (213) and the second controllable power switch (216) to be closed, and performing a pre-charging process of a capacitor on the electric automobile; and
-Controlling the pre-charge controllable power switch (213) to open, -controlling the first controllable power switch (211), the third controllable power switch (231) and the fourth controllable power switch (236) to close, -performing a discharge output in parallel equal to the standard voltage.
12. The control method according to claim 9, characterized by further comprising the step of:
S30, when one of the first battery unit (11) and the second battery unit (12) fails, controlling the fifth controllable power switch (220) to be turned off, and controlling the first controllable power switch (211) and the second controllable power switch (216) in the first circuit module corresponding to the failed first battery unit (11) to be turned off, or controlling the third controllable power switch (231) and the fourth controllable power switch (236) in the second circuit module corresponding to the failed second battery unit (12) to be turned off.
13. An electric automobile, characterized by comprising:
A power cell assembly (10);
A charge input (30)/discharge output (50); and
The voltage conversion control device (20, 40) according to any one of claims 1 to 8.
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| DE102019129705A1 (en) * | 2019-11-05 | 2021-05-06 | Bayerische Motoren Werke Aktiengesellschaft | Multi-voltage storage system for an at least partially electrically powered vehicle |
| CN112757882A (en) * | 2019-11-06 | 2021-05-07 | 观致汽车有限公司 | Battery pack and management method and system thereof |
| CN113682156A (en) * | 2021-07-06 | 2021-11-23 | 北京新能源汽车股份有限公司蓝谷动力***分公司 | Charge-discharge circuit, battery pack and electric automobile |
| CN116711178A (en) * | 2021-12-30 | 2023-09-05 | 宁德时代新能源科技股份有限公司 | Battery control circuit, method and power utilization device |
| CN116830415A (en) * | 2022-01-26 | 2023-09-29 | 宁德时代新能源科技股份有限公司 | Battery management method and battery management device |
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