CN114884175A - Charging control method of battery pack, power supply system and charger - Google Patents
Charging control method of battery pack, power supply system and charger Download PDFInfo
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- CN114884175A CN114884175A CN202210657935.1A CN202210657935A CN114884175A CN 114884175 A CN114884175 A CN 114884175A CN 202210657935 A CN202210657935 A CN 202210657935A CN 114884175 A CN114884175 A CN 114884175A
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- 238000007600 charging Methods 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000004891 communication Methods 0.000 claims description 11
- 238000012790 confirmation Methods 0.000 claims description 9
- 238000010277 constant-current charging Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
- H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
-
- 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)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a battery pack charging control method, a battery pack, a power supply system and a charger, wherein a plurality of battery packs comprising batteries, switches and controllers and the chargers are communicated through a bus, each battery is electrically connected with the charger through a corresponding switch, the charging control method is applied to a controller in a first battery pack, the first battery pack is any one of the battery packs, and the charging control method comprises the following steps: acquiring the voltages of the batteries in all the battery packs through the bus; and controlling the working state of the switch in the first battery pack according to the voltage of the battery in the first battery pack and the voltage of the battery in the second battery pack. The invention shares information among a plurality of battery packs through the bus, each battery pack controls self charging according to the voltage of the battery and the voltages of the batteries of other battery packs, the charger controls output current according to the number of the battery packs in charging, each battery pack can keep constant current charging, and the charging efficiency of the multi-battery pack is improved.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a charging control method of a battery pack, the battery pack, a power supply system and a charger.
Background
Because of the limitation of materials, the traditional new energy industry has factors such as continuous range difference and inconvenient disassembly, and the like, so that the single group of lithium batteries (single battery pack) is powered off halfway, and the use experience of customers is greatly influenced. Aiming at the phenomenon, a plurality of groups of batteries or standby battery systems are produced by accident, thereby solving the problems of poor endurance and inconvenient disassembly.
However, with the popularization of multiple batteries in the market, new problems emerge again, how to improve the charging efficiency becomes another focus of attention of customers, and the charging process of the conventional charger mostly includes the following two stages:
(1) stage one: and (5) a constant current charging stage.
(2) And a second stage: and (5) a constant power charging stage.
When the single-group battery is charged, the output current of the traditional charger is constant in the constant current charging stage, which is related to the single-group battery. However, if a plurality of batteries (a plurality of battery packs) are charged simultaneously, the charging efficiency is low, and because the plurality of batteries cannot be disassembled due to large battery capacity and safety, how to charge the plurality of batteries simultaneously on the vehicle becomes a new concern.
Disclosure of Invention
The invention aims to overcome the defect that the charging efficiency is low due to the fact that a plurality of groups of batteries are charged simultaneously in the prior art, and provides a charging control method of a battery pack, the battery pack, a power supply system and a charger.
The invention solves the technical problems through the following technical scheme:
the invention provides a charging control method of battery packs, wherein a plurality of battery packs are in communication connection through a bus, each battery pack comprises a battery, a switch and a controller, each battery pack is in communication connection with a charger through the bus, the battery in each battery pack is electrically connected with the charger through the switch, the charging control method is applied to the controller in a first battery pack, wherein the first battery pack is any one of the battery packs, and the charging control method comprises the following steps:
acquiring the voltages of the batteries in all the battery packs through the bus;
and controlling the working state of a switch in the first battery pack according to the voltage of the battery in the first battery pack and the voltage of the battery in the second battery pack.
Preferably, the step of controlling the operating state of the switch in the first battery pack according to the voltage of the battery in the first battery pack and the voltage of the battery in the second battery pack specifically includes:
and if the voltage of the battery in the first battery pack is the lowest, controlling the switch in the first battery pack to be switched on so as to enable the charger to charge the battery in the first battery pack.
Preferably, if the voltage of the battery in the first battery pack is the lowest, the step of controlling the switch in the first battery pack to be turned on specifically includes:
if the voltage of the battery in the first battery pack is the lowest, sending a charging request to the charger;
and controlling the switch in the first battery pack to be conducted in response to a charging confirmation instruction of the charger.
Preferably, the charge control method further includes:
and if the voltage of the battery in the first battery pack reaches a preset voltage, controlling a switch in the first battery pack to be switched off.
The invention also provides a charging control method of battery packs, wherein a plurality of battery packs are in communication connection through a bus, each battery pack comprises a battery, a switch and a controller, each battery pack is in communication connection with a charger through the bus, the battery in each battery pack is electrically connected with the charger through the switch, wherein a first battery pack is any one of the battery packs, the charging control method is applied to the charger, and the charging control method comprises the following steps:
receiving a charging request sent by a first battery pack;
sending a charging confirmation instruction to the corresponding first battery pack according to the charging request;
acquiring the charging state information of the batteries in all the battery packs through the bus, and determining the number of the battery packs in a charging conduction state as the number of target battery packs;
setting output current according to preset single battery pack charging current and the number of the target battery packs; wherein the single battery pack charging current is determined according to the rated charging current of the single battery pack.
Preferably, the step of setting an output current according to a preset charging current of the single battery pack and the target number of battery packs specifically includes:
and setting the output current as the product of the charging current of the single battery pack and the number of the target battery packs.
The invention also provides a battery pack, which comprises a battery, a switch and a controller, wherein the controller is respectively electrically connected with the battery and the switch, the battery is electrically connected with a voltage interface of external equipment through the switch, and the controller is in communication connection with the external equipment through a bus;
when the external device is a charger, the controller realizes the charging control method of the battery pack.
Preferably, the switch includes a first NMOS (Negative channel Metal Oxide Semiconductor) transistor and a second NMOS transistor;
the source electrode of the first NMOS tube is electrically connected with the negative electrode of the output voltage of the charger, the drain electrode of the first NMOS tube is electrically connected with the drain electrode of the second NMOS tube, the source electrode of the second NMOS tube is electrically connected with the negative electrode of the battery, the grid electrode of the first NMOS tube and the grid electrode of the second NMOS tube are both electrically connected with the controller, and the positive electrode of the battery is electrically connected with the positive electrode of the output voltage of the charger.
The invention also provides a power supply system which comprises a plurality of the battery packs, and the battery packs are in communication connection through a bus.
The invention also provides a charger, and the charger realizes the charging control method of the battery pack.
The positive progress effects of the invention are as follows: the multiple battery packs share mutual information through the bus, each battery pack controls the charging of the battery pack according to the voltage of the battery and the voltages of the batteries of other battery packs, and the charger controls the output current according to the number of the battery packs in charging, so that each battery pack in charging can keep constant-current charging, and the charging efficiency of the multiple battery packs is improved.
Drawings
Fig. 1 is a flowchart of a method for controlling charging of a battery pack according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a specific implementation of step S12 in the method for controlling charging of a battery pack according to embodiment 1 of the present invention.
Fig. 3 is a flowchart of a specific implementation of step S121 in the method for controlling charging of a battery pack according to embodiment 1 of the present invention.
Fig. 4 is a flowchart of a method for controlling charging of a battery pack according to embodiment 2 of the present invention.
Fig. 5 is a module schematic view of a battery pack according to embodiment 3 of the present invention.
Fig. 6 is a block diagram of a power supply system according to embodiment 4 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a charging control method of a battery pack. The charging control method is applied to a controller in a first battery pack, wherein the first battery pack is any one of the plurality of battery packs.
Referring to fig. 1, the charge control method includes:
and S11, acquiring the voltages of the batteries in all the battery packs through the bus.
And S12, controlling the working state of the switch in the first battery pack according to the voltage of the battery in the first battery pack and the voltage of the battery in the second battery pack.
In each battery pack, the controller is in communication connection with the charger through a bus, and the controller is electrically connected with the battery and the switch respectively.
The battery packs in the power supply system with multiple battery packs are connected into the power supply system in parallel, the batteries adopt the same-port design, the anodes of all the batteries are connected together, the cathodes of all the batteries are connected together, and discharging is not allowed during charging.
When the charger is just connected with the power supply system, information sharing is firstly carried out on the charger and the battery pack in the power supply system, at the moment, the charger does not output, and the battery pack closes the switch. The plurality of battery packs share information with each other through the bus, and each battery pack can broadcast information of the battery pack through the bus and receive information of other battery packs. The information may be the voltage of the battery, the number of system batteries, charge state information, etc. The charger may also obtain information for each battery pack via the bus.
Then, each battery pack controls the charging of the battery pack itself through a corresponding switch according to the voltage of the battery of itself and the voltages of the batteries of the other battery packs. After the battery pack adjusts the working state of the corresponding switch, the battery pack can share the charging state information of the battery through the bus.
The charger determines the number of battery packs in the charge on state (i.e., battery packs in charge) as the target battery pack number. When the charger charges the batteries in the battery pack, the output voltage of the charger is kept unchanged all the time, and the output current of the charger is set according to the preset charging current of the single battery pack and the number of the target battery packs.
In the embodiment, the plurality of battery packs share the information of each other through the bus, each battery pack controls the charging of the battery pack according to the voltage of the battery and the voltages of the batteries of other battery packs, and the charger controls the output current according to the number of the battery packs in the charging process, so that each battery pack in the charging process can keep constant-current charging, and the charging efficiency of the plurality of battery packs is improved.
In specific implementation, referring to fig. 2, step S12 specifically includes:
and S121, if the voltage of the battery in the first battery pack is the lowest, controlling the switch in the first battery pack to be turned on so that the charger charges the battery in the first battery pack.
Wherein if the voltages of the batteries in the plurality of battery packs are the same, that is, the voltages of the batteries in all the battery packs are the lowest, all the battery packs turn on the corresponding switches, and since the voltages of the batteries in all the battery packs are the same, the battery packs are not charged with each other, and the charger charges the batteries in all the battery packs.
If the voltages of the batteries in the plurality of battery packs are different, namely the voltages of the batteries in the battery packs are high or low, and the voltages of the batteries in only a part of the battery packs are the lowest, the battery pack with the lowest voltage of the batteries conducts the corresponding switch, and the charger charges the battery in the battery pack with the lowest voltage of the battery. In the charging process of the battery pack with the lowest voltage of the primary battery, the voltage of the battery gradually rises until the voltage of the battery in the battery pack with the lowest voltage of the primary battery is equal to the voltage of the battery in the battery pack with the second lowest voltage, so that the battery pack with the second lowest voltage also turns on the corresponding switch, and the charger charges the battery in the battery pack with the lowest voltage of the current battery (the battery pack with the lowest voltage of the primary battery and the battery pack with the second lowest voltage). Since the voltages of the cells in the multi-cell pack are the same during charging, the packs are not charged with each other. And the like until the batteries in all the battery packs are fully charged.
For example, the plurality of battery packs includes a battery pack a and a battery pack B, each of which has a battery voltage of 10 volts, assuming that a rated charging current of a single battery pack is 2 amps. Then, battery packs a and B open their switches simultaneously, the charger charges the batteries in battery packs a and B simultaneously (output current 2 × 3 — 6 amps), battery packs A, B and C obtain 2 amps of charging current, respectively, battery packs A, B and C are charged at the maximum efficiency simultaneously, and the multiple battery packs reach the maximum charging efficiency until the batteries in battery packs a and B are fully charged.
For another example, the plurality of battery packs includes battery pack a, battery pack B, and battery pack C, the voltage of the battery in battery pack a is 10 volts, the voltage of the battery in battery pack B is 8 volts, and the voltage of the battery in battery pack C is 15 volts, assuming that the rated charging current of a single battery pack is 2 amps.
Then, the battery B turns on its switch first, the charger charges the battery in the battery B first (the output current is 2 × 1 ═ 2 amperes), the battery B obtains a charging current of 2 amperes, and the battery B is charged with the maximum efficiency. When the voltage of the battery in the battery pack B rises to 10 volts (equal to the voltage of the battery in the battery pack a), the voltage of the battery in the battery pack a also becomes the current lowest voltage, the battery pack a also opens its own switch, the charger increases the output current (the output current is 2 × 2 — 4 a) and simultaneously charges the batteries in the battery packs a and B, the battery packs a and B obtain 2 a charging current respectively, and the battery packs a and B are simultaneously charged with the maximum efficiency.
Then, when the voltages of the cells in the battery packs a and B rise to 15 volts (equal to the voltage of the cell in the battery pack C), the voltage of the cell in the battery pack C also becomes the current lowest voltage, the battery pack C also opens its own switch, the charger increases the output current (the output current is 2 × 3 ═ 6 amperes) and simultaneously charges the cells in the battery packs A, B and C, the battery packs A, B and C respectively obtain 2 amperes of charging current, the battery packs A, B and C are simultaneously charged at the maximum efficiency, and the plurality of battery packs reach the maximum charging efficiency until the cells in the battery packs A, B and C are fully charged.
In the embodiment, the battery pack with the lowest voltage of the battery receives the charging current provided by the charger by controlling the switch of the battery pack to be conducted, and the charger controls the output current according to the number of the battery packs in charging, so that each battery pack in charging can keep constant-current charging, and the charging efficiency of the multi-battery pack is improved.
In specific implementation, referring to fig. 3, step S121 specifically includes:
and S1211, if the voltage of the battery in the first battery pack is the lowest, sending a charging request to the charger.
And S1212, responding to the charging confirmation instruction of the charger, and controlling the switch in the first battery pack to be turned on.
Wherein the battery pack having the lowest voltage of the batteries requests the charger to allow it to start charging by a charging request. And the charger sends a charging confirmation instruction to the corresponding battery pack according to the charging request. And after the battery pack receives the charging confirmation instruction, controlling the corresponding switch to be conducted.
In the embodiment, the battery pack with the lowest voltage of the battery requests the charger to allow the charger to start charging through the charging request, and after receiving the charging confirmation instruction, the corresponding switch is controlled to be switched on to receive the charging current provided by the charger, and the charger controls the output current according to the number of the battery packs in charging, so that each battery pack in charging can keep constant-current charging, and the charging efficiency of multiple battery packs is improved.
In specific implementation, the charging control method further includes:
and if the voltage of the battery in the first battery pack reaches the preset voltage, controlling the switch in the first battery pack to be switched off.
The preset voltage may be an output voltage of the charger. Under the condition that the preset voltage is the output voltage of the charger, when the voltage of the battery in the battery pack reaches the preset voltage, the battery in the battery pack reaches charge-discharge balance, and the battery is neither charged nor discharged.
In this embodiment, a specific implementation manner of controlling charging of battery packs is provided, a plurality of battery packs share information with each other through a bus, each battery pack controls charging on and off of the battery pack according to the voltage of the battery pack and the voltages of the batteries of other battery packs, and a charger controls output current according to the number of the battery packs in charging, so that each battery pack in charging can keep constant-current charging, and charging efficiency of the plurality of battery packs is improved.
Example 2
The present embodiment provides a charging control method of a battery pack. The charging control method comprises the following steps that a plurality of battery packs are in communication connection through a bus, each battery pack comprises a battery, a switch and a controller, each battery pack is in communication connection with a charger through the bus, the battery in each battery pack is electrically connected with the charger through the switch, the first battery pack is any one of the battery packs, and the charging control method is applied to the charger.
Referring to fig. 4, the charge control method includes:
and S21, receiving a charging request sent by the first battery pack.
And S22, sending a charging confirmation instruction to the corresponding first battery pack according to the charging request.
And S23, acquiring the charging state information of the batteries in all the battery packs through the bus, and determining the number of the battery packs in the charging conducting state as the target battery pack number.
And S24, setting output current according to the preset single battery pack charging current and the target battery pack number. Wherein the charging current of the single battery pack is determined according to the rated charging current of the single battery pack.
And the charging current of the single battery pack is not more than the rated charging current of the single battery pack.
Preferably, the single battery pack charging current is equal to the rated charging current of the single battery pack.
The battery packs in the power supply system with multiple battery packs are connected into the power supply system in parallel, the batteries adopt the same-port design, the anodes of all the batteries are connected together, the cathodes of all the batteries are connected together, and discharging is not allowed during charging.
When the charger is just connected with the power supply system, information sharing is firstly carried out on the charger and the battery pack in the power supply system, at the moment, the charger does not output, and the battery pack closes the switch. The plurality of battery packs share information with each other through the bus, and each battery pack can broadcast information of the battery pack through the bus and receive information of other battery packs. The information may be the voltage of the battery, the number of system batteries, charge state information, etc. The charger may also obtain information for each battery pack via the bus.
Then, each battery pack controls the charging of the battery pack itself through a corresponding switch according to the voltage of the battery of itself and the voltages of the batteries of the other battery packs. After the battery pack adjusts the working state of the corresponding switch, the battery pack can share the charging state information of the battery through the bus.
The charger determines the number of battery packs in the charge on state (i.e., battery packs in charge) as the target battery pack number. When the charger charges the batteries in the battery pack, the output voltage of the charger is kept unchanged all the time, and the output current of the charger is set according to the preset charging current of the single battery pack and the number of the target battery packs.
If the voltages of the cells in the plurality of cell groups are the same, i.e., the voltages of the cells in all of the cell groups are the lowest, then all of the cell groups turn on the corresponding switches, and since the voltages of the cells in all of the cell groups are the same, the cell groups do not charge each other, and the charger charges the cells in all of the cell groups.
If the voltages of the batteries in the plurality of battery packs are different, namely the voltages of the batteries in the battery packs are high or low, and the voltages of the batteries in only a part of the battery packs are the lowest, the battery pack with the lowest voltage of the batteries conducts the corresponding switch, and the charger charges the battery in the battery pack with the lowest voltage of the battery. In the charging process of the battery pack with the lowest voltage of the primary battery, the voltage of the battery gradually rises until the voltage of the battery in the battery pack with the lowest voltage of the primary battery is equal to the voltage of the battery in the battery pack with the second lowest voltage, so that the battery pack with the second lowest voltage also turns on the corresponding switch, and the charger charges the battery in the battery pack with the lowest voltage of the current battery (the battery pack with the lowest voltage of the primary battery and the battery pack with the second lowest voltage). Since the voltages of the cells in the multi-cell group in charge are the same, the groups are not charged with each other. And the like until the batteries in all the battery packs are fully charged.
In the case where the single-cell pack charging current is equal to the rated charging current of the single-cell pack, each of the battery packs under charging can be charged with maximum efficiency.
For example, the plurality of battery packs includes a battery pack a and a battery pack B, each of which has a battery voltage of 10 volts, assuming that a rated charging current of a single battery pack is 2 amps. Then, battery packs a and B open their switches simultaneously, the charger charges the batteries in battery packs a and B simultaneously (output current 2 × 3 — 6 amps), battery packs A, B and C obtain 2 amps of charging current, respectively, battery packs A, B and C are charged at the maximum efficiency simultaneously, and the multiple battery packs reach the maximum charging efficiency until the batteries in battery packs a and B are fully charged.
For another example, the plurality of battery packs includes battery pack a, battery pack B, and battery pack C, the voltage of the battery in battery pack a is 10 volts, the voltage of the battery in battery pack B is 8 volts, and the voltage of the battery in battery pack C is 15 volts, assuming that the rated charging current of a single battery pack is 2 amps.
Then, the battery B turns on its switch first, the charger charges the battery in the battery B first (the output current is 2 × 1 ═ 2 amperes), the battery B obtains a charging current of 2 amperes, and the battery B is charged with the maximum efficiency. When the voltage of the battery in the battery pack B rises to 10 volts (equal to the voltage of the battery in the battery pack a), the voltage of the battery in the battery pack a also becomes the current lowest voltage, the battery pack a also opens its own switch, the charger increases the output current (the output current is 2 × 2 — 4 a) and simultaneously charges the batteries in the battery packs a and B, the battery packs a and B obtain 2 a charging current respectively, and the battery packs a and B are simultaneously charged with the maximum efficiency.
Then, when the voltages of the cells in the battery packs a and B rise to 15 volts (equal to the voltage of the cell in the battery pack C), the voltage of the cell in the battery pack C also becomes the current lowest voltage, the battery pack C also opens its own switch, the charger increases the output current (the output current is 2 × 3 ═ 6 amperes) and simultaneously charges the cells in the battery packs A, B and C, the battery packs A, B and C respectively obtain 2 amperes of charging current, the battery packs A, B and C are simultaneously charged at the maximum efficiency, and the plurality of battery packs reach the maximum charging efficiency until the cells in the battery packs A, B and C are fully charged.
In the embodiment, the plurality of battery packs share the information of each other through the bus, each battery pack controls the charging of the battery pack according to the voltage of the battery and the voltages of the batteries of other battery packs, and the charger controls the output current according to the number of the battery packs in the charging process, so that each battery pack in the charging process can keep constant-current charging, and the charging efficiency of the plurality of battery packs is improved.
In specific implementation, step S24 specifically includes:
the output current is set to be the product of the single battery pack charging current and the target battery pack number.
The number of the target battery packs is increased every time one battery pack in the charging conducting state is added, the output current is increased by a single battery pack charging current, namely, the output current of the charger is an integral multiple of the single battery pack charging current, and the integral multiple is equal to the number of the target battery packs, so that each battery pack in the charging conducting state can be kept in constant-current charging.
In this embodiment, a specific implementation manner of setting the output current of the charger is provided, the plurality of battery packs share information with each other through a bus, each battery pack controls the charging of the battery pack to be turned on and off according to the voltage of the battery pack and the voltages of the batteries of other battery packs, and the charger controls the output current according to the number of the battery packs in charging, so that each battery pack in charging can keep constant-current charging, and the charging efficiency of the plurality of battery packs is improved.
Example 3
The present embodiment provides a battery pack. Referring to fig. 5, the battery pack includes a battery 1, a switch 2, and a controller 3, the controller 3 is electrically connected to the battery 1 and the switch 2, respectively, the battery 1 is electrically connected to a voltage interface of an external device through the switch 2, and the controller 3 is communicatively connected to the external device through a bus. In fig. 5, the external device connected to the battery pack is a charger.
When the external device is a charger, the controller 3 implements the charging control method of the battery pack in embodiment 1.
In the embodiment, the plurality of battery packs share the information of each other through the bus, each battery pack controls the charging of the battery pack to be started or stopped according to the voltage of the battery pack and the voltages of the batteries of other battery packs, and the charger controls the output current according to the number of the battery packs in charging, so that each battery pack in charging can be charged at a constant current, and the charging efficiency of the plurality of battery packs is improved.
In specific implementation, the switch 2 includes a first NMOS transistor 21 and a second NMOS transistor 22.
The source electrode of the first NMOS tube 21 is electrically connected with the negative electrode of the output voltage of the charger, the drain electrode of the first NMOS tube 21 is electrically connected with the drain electrode of the second NMOS tube 22, the source electrode of the second NMOS tube 22 is electrically connected with the negative electrode of the battery 1, the grid electrode of the first NMOS tube 21 and the grid electrode of the second NMOS tube 22 are both electrically connected with the controller 3, and the positive electrode of the battery 1 is electrically connected with the positive electrode of the output voltage of the charger.
The state of the grid electrode of the first NMOS tube and the state of the grid electrode of the second NMOS tube are changed, so that the negative electrode of the battery and the negative electrode of the output voltage of the charger can be conducted, and the charger charges the battery.
In this embodiment, a specific implementation of a switch in a battery pack is provided.
Example 4
This embodiment provides a power supply system, and referring to fig. 6, the power supply system includes a plurality of battery packs 4 of embodiment 3, the plurality of battery packs 4 are connected by bus communication, the positive electrode of the battery pack 4 (i.e., the positive electrode of the battery) is electrically connected to the positive electrode of the voltage of the external device, and the negative electrode of the battery pack 4 (i.e., the negative electrode of the battery) is electrically connected to the negative electrode of the voltage of the external device
In this embodiment, a plurality of battery packs in the power supply system share information with each other through a bus, each battery pack controls the charging of the battery pack to be turned on and off according to the voltage of the battery pack and the voltages of the batteries of other battery packs, and the charger controls the output current according to the number of the battery packs in charging, so that each battery pack in charging can keep constant-current charging, and the charging efficiency of the power supply system is improved.
Example 5
The present embodiment provides a charger that implements the charging control method of the battery pack in embodiment 2.
In the embodiment, the plurality of battery packs share the information of each other through the bus, each battery pack controls the charging of the battery pack to be started or stopped according to the voltage of the battery pack and the voltages of the batteries of other battery packs, and the charger controls the output current according to the number of the battery packs in charging, so that each battery pack in charging can be charged at a constant current, and the charging efficiency of the plurality of battery packs is improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A charging control method for battery packs, wherein a plurality of battery packs are communicatively connected via a bus, each battery pack includes a battery, a switch and a controller, each battery pack is communicatively connected to a charger via the bus, the battery in each battery pack is electrically connected to the charger via the switch, the charging control method is applied to the controller in a first battery pack, wherein the first battery pack is any one of the plurality of battery packs, and the charging control method includes:
acquiring the voltages of the batteries in all the battery packs through the bus;
and controlling the working state of a switch in the first battery pack according to the voltage of the battery in the first battery pack and the voltage of the battery in the second battery pack.
2. The battery pack charging control method according to claim 1, wherein the step of controlling the operating state of the switch in the first battery pack based on the voltage of the battery in the first battery pack and the voltage of the battery in the second battery pack specifically comprises:
and if the voltage of the battery in the first battery pack is the lowest, controlling the switch in the first battery pack to be switched on so as to enable the charger to charge the battery in the first battery pack.
3. The battery pack charging control method according to claim 2, wherein the step of controlling the switch in the first battery pack to be turned on if the voltage of the battery in the first battery pack is the lowest includes:
if the voltage of the battery in the first battery pack is the lowest, sending a charging request to the charger;
and controlling the switch in the first battery pack to be conducted in response to a charging confirmation instruction of the charger.
4. The charge control method of a battery pack according to claim 2, characterized by further comprising:
and if the voltage of the battery in the first battery pack reaches a preset voltage, controlling a switch in the first battery pack to be switched off.
5. A charging control method for battery packs, wherein a plurality of battery packs are communicatively connected via a bus, each battery pack includes a battery, a switch and a controller, each battery pack is communicatively connected to a charger via the bus, the battery in each battery pack is electrically connected to the charger via the switch, wherein a first battery pack is any one of the plurality of battery packs, the charging control method is applied to the charger, and the charging control method includes:
receiving a charging request sent by a first battery pack;
sending a charging confirmation instruction to the corresponding first battery pack according to the charging request;
acquiring the charging state information of the batteries in all the battery packs through the bus, and determining the number of the battery packs in a charging conduction state as the number of target battery packs;
setting output current according to preset single battery pack charging current and the number of the target battery packs; wherein the single battery pack charging current is determined according to the rated charging current of the single battery pack.
6. The battery pack charging control method according to claim 5, wherein the step of setting the output current according to a preset cell pack charging current and the target battery pack number specifically comprises:
and setting the output current as the product of the charging current of the single battery pack and the number of the target battery packs.
7. A battery pack is characterized by comprising a battery, a switch and a controller, wherein the controller is electrically connected with the battery and the switch respectively, the battery is electrically connected with a voltage interface of an external device through the switch, and the controller is in communication connection with the external device through a bus;
when the external device is a charger, the controller implements the charge control method of the battery pack according to any one of claims 1 to 4.
8. The battery pack of claim 7, wherein the switch comprises a first NMOS transistor and a second NMOS transistor;
the source electrode of the first NMOS tube is electrically connected with the negative electrode of the output voltage of the charger, the drain electrode of the first NMOS tube is electrically connected with the drain electrode of the second NMOS tube, the source electrode of the second NMOS tube is electrically connected with the negative electrode of the battery, the grid electrode of the first NMOS tube and the grid electrode of the second NMOS tube are electrically connected with the controller, and the positive electrode of the battery is electrically connected with the positive electrode of the output voltage of the charger.
9. A power supply system comprising a plurality of battery packs according to any one of claims 7 to 8, the plurality of battery packs being communicatively connected via a bus.
10. A charger characterized in that it implements a charging control method of a battery pack according to any one of claims 5 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210657935.1A CN114884175A (en) | 2022-06-10 | 2022-06-10 | Charging control method of battery pack, power supply system and charger |
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| CN202210657935.1A CN114884175A (en) | 2022-06-10 | 2022-06-10 | Charging control method of battery pack, power supply system and charger |
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| KR20180044750A (en) * | 2016-10-24 | 2018-05-03 | 한화지상방산 주식회사 | Battery system and charge and discharge controlling method for battery packs |
| CN108964160A (en) * | 2017-05-22 | 2018-12-07 | 东莞乔登节能科技有限公司 | Simulate DC controllable current electronic switch |
| CN110832689A (en) * | 2017-07-05 | 2020-02-21 | 罗伯特·博世有限公司 | Main control device for battery system |
| CN114030384A (en) * | 2021-11-19 | 2022-02-11 | 广州小鹏汽车科技有限公司 | Battery pack charging control method, battery management system, device and vehicle |
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| WO2013157518A1 (en) * | 2012-04-16 | 2013-10-24 | 株式会社豊田自動織機 | Cell charger and voltage equalization method |
| US20160233692A1 (en) * | 2015-02-06 | 2016-08-11 | Samusung Electronics Co., Ltd. | Method and apparatus for controlling battery charging of device |
| KR20180044750A (en) * | 2016-10-24 | 2018-05-03 | 한화지상방산 주식회사 | Battery system and charge and discharge controlling method for battery packs |
| CN108964160A (en) * | 2017-05-22 | 2018-12-07 | 东莞乔登节能科技有限公司 | Simulate DC controllable current electronic switch |
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Address after: 201414 Building 9, No. 3492 Guangming Qianqian Road, Qingcun Town, Fengxian District, Shanghai Applicant after: Shanghai Paizhi Energy Co.,Ltd. Address before: 201414 Building 9, No. 3492 Guangming Qianqian Road, Qingcun Town, Fengxian District, Shanghai Applicant before: Shanghai paizhi Energy Co.,Ltd. |
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Application publication date: 20220809 |