CN110266066B - Charging control device and charging control method for parallel connection of multiple lithium battery packs - Google Patents
Charging control device and charging control method for parallel connection of multiple lithium battery packs Download PDFInfo
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 269
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a charging control device and a charging control method for parallel connection of multiple lithium battery packs, which relate to the field of energy storage power supplies and comprise a plurality of lithium battery packs, a voltage reduction module, a control module and a charger; the lithium battery packs are provided with charging input interfaces connected with the charger, and the lithium battery packs are connected in parallel in sequence and then connected to the control module through the voltage reduction module; the control module comprises a microcontroller, a power supply circuit, a communication transceiving circuit and a charging instruction receiving circuit, wherein the power supply circuit, the communication transceiving circuit and the charging instruction receiving circuit are connected to the microcontroller; the charging system has a simple structure, does not need a charger to establish communication with the battery pack, is in communication connection with all lithium battery packs through the control module, controls the corresponding charging loop of each lithium battery pack by combining the voltage information of each lithium battery pack, and safely and orderly charges each lithium battery pack in the lithium battery pack; the invention combines the lithium battery pack, the control module and the charger into a whole to carry out charging control, improves the communication and charging efficiency, improves the use convenience of users, and reduces the control complexity and the development cost of the charging control device.
Description
Technical Field
The invention relates to the field of energy storage power supplies, in particular to a charging control device and a charging control method for parallel connection of multiple lithium battery packs.
Background
The household standby power supply mainly takes a small and medium-sized gasoline and diesel generator set as a main part at present, but due to the lack of future petroleum resources, the noise of a generator, air pollution and the like, the novel energy storage standby power supply meets greater market demands, such as solar energy storage, wind energy storage and the like. Energy storage battery mainly uses lead-acid batteries and lithium cell group at present as leading-acid batteries energy density is low, and is bulky, and weight is big, is replaced by lithium cell group gradually in the energy storage field, and lithium cell group becomes the new pet in this field.
At present, the lithium battery pack is more complex in use than a lead-acid battery, and a BMS module (battery management system) is required to detect a battery cell in real time and control the safe charging and discharging of the battery pack. Due to the user's demands for battery capacity and convenience of use, it is often necessary to connect lithium battery packs in parallel to extend the time of use of electricity. As is well known, each lithium battery pack can not be simply connected in parallel because of different electric quantities, otherwise the high-voltage battery pack can be charged to the low-voltage battery pack by the current close to the short circuit, and the lithium battery pack BMS can enter the short circuit protection and can not work normally. How to realize the parallel connection of multiple lithium batteries and safely and reliably charge and discharge the batteries is a difficult problem to overcome.
At present, related research institutions adopt a customized lithium battery pack charger with serial port communication such as RS485 to charge a plurality of lithium battery packs. A control system and method for implementing parallel cyclic charging of multiple lithium battery packs as disclosed in CN201410056812.8 patent, the system includes: the device comprises a charger, a plurality of lithium battery packs, a charging loop and a communication line group. The specific using method comprises the following steps: firstly, multiple battery packs are connected in parallel and then separated from a main control panel and a load, a communication module is arranged in a battery charger and used as a host of the whole system to establish communication with the lithium battery packs connected in parallel, and then the lithium battery packs are charged one by one. Although the method solves the charging problem of the lithium battery pack, the control mainboard, the load and the charger cannot be combined into a whole for charging, because the whole system is provided with two hosts (the control mainboard and the charger), normal communication and work cannot be realized, the use convenience of a user is reduced, and meanwhile, the special lithium battery pack charger with a built-in communication system needs to be customized, is not standard battery charging equipment, is increased in cost and is not beneficial to maintenance and replacement.
SUMMERY OF THE UTILITY MODEL
The invention aims to provide a charging control device and a charging control method for parallel connection of multiple lithium battery packs, which have the advantages of simple structure, convenience in use, safety and reliability.
In order to achieve the above purpose, the invention provides the following technical scheme: a charging control device with multiple lithium battery packs connected in parallel comprises a plurality of lithium battery packs, a voltage reduction module, a control module and a charger; the lithium battery packs are connected in parallel in sequence by adopting battery pack charging and discharging wire harnesses and then connected to the voltage reduction module, and the voltage reduction module is connected to the control module; the control module comprises a microcontroller, the microcontroller selects a single chip microcomputer with the model number of PIC16F1947, and a power supply circuit, a communication transceiving circuit and a charging instruction receiving circuit which are connected with the microcontroller; the voltage reduction module is connected to the power supply circuit and used for the lithium battery pack to supply power to the control module in a voltage stabilizing manner; the lithium battery packs are connected in parallel in sequence by adopting battery pack communication wiring harnesses and then connected to the communication transceiving circuit and used for sending information of each lithium battery pack to the microcontroller; the lithium battery packs are connected in parallel in sequence by adopting charging request signal wire harnesses and then connected to a charging instruction receiving circuit, and the charging instruction receiving circuit is used for sending a charging request signal to the microcontroller by a charger; and the microcontroller is used for sending a command of opening a charging loop to a power management system of each lithium battery pack according to the charging request signal and the information of each lithium battery pack so as to realize the parallel charging of each lithium battery pack.
Furthermore, a control program is preset in the microcontroller, and is used for sending a command for opening a charging loop to a power management system of the lithium battery pack with the lowest voltage by combining information of the lithium battery packs collected by the communication transceiving circuit when the microcontroller receives a charging request sent by the charger, starting the charging loop of the lithium battery pack to realize charging of the lithium battery pack, and sending the command for opening the charging loop to the power management system of the lithium battery pack with the second lowest voltage by the control program when the voltage of the lithium battery pack is equal to the voltage of the lithium battery pack with the second lowest voltage to realize simultaneous parallel charging of the two lithium battery packs; repeating the judgment until the control program sends a command of opening a charging loop to a power management system of the lithium battery pack with the highest voltage, so that all the lithium battery packs connected with the control module in parallel are charged in parallel at the same time; the charger is effectively prevented from being connected with each lithium battery pack in a communication mode, the communication is simple, only the control module is adopted as a host, and the charging convenience of a user for connecting the multiple lithium battery packs in parallel is effectively improved.
Further, the charging request signal sent by the charger to the microcontroller comprises a short circuit signal, a disconnection signal, a high level signal and a low level signal.
Further, the charger comprises a charger main body, a charger output terminal and a charging request line, wherein the charger main body is connected to a charging power supply and is used for charging the lithium battery pack; the output terminal of the charger is connected with any lithium battery pack and comprises a positive electrode charging socket and a negative electrode charging socket which are used for connecting a charging and discharging wire harness of the battery pack, and the positive electrode charging socket and the negative electrode charging socket are respectively connected with the positive electrode and the negative electrode of the charging and discharging wire harness of the battery pack and are used for being communicated with a charging circuit of the lithium battery pack; the charging request line is arranged in the output terminal of the charger and is two signal terminals with internal short circuit, and the signal terminals are connected to the charging instruction receiving circuit to send short circuit signals to the control module, so that the charging request signal is simple and safe to set.
Further, the charger includes a charger main body and a charger output terminal; the charger main body is connected with a charging power supply and is used for charging the lithium battery pack; the output terminal of the charger is connected with any lithium battery pack and comprises a positive electrode charging socket and a negative electrode charging socket which are used for connecting a charging and discharging wire harness of the battery pack, and the positive electrode charging socket and the negative electrode charging socket are respectively connected with the positive electrode and the negative electrode of the charging and discharging wire harness of the battery pack and are used for being communicated with a charging circuit of the lithium battery pack; any one of the lithium battery packs is provided with a charging input interface, a microswitch is arranged in the charging input interface, and the microswitch is connected with a charging request signal wire harness; the microswitch is initially in a normally open state or a normally closed state, when the output terminal of the charger is inserted into the charging input interface of any lithium battery pack, the output terminal of the charger abuts against the switch of the microswitch, so that the microswitch jumps to the normally closed state or the normally open state opposite to the initial state and is used for sending a short circuit signal or a circuit breaking signal to the control module; the charger directly uses ordinary charger, and it is more convenient to use.
Furthermore, the parallel charging control device of the multi-lithium battery pack further comprises a display module connected to the control module, wherein the display module is used for displaying information such as electric quantity, voltage, current, charging, discharging and faults of each current lithium battery pack, and a worker can conveniently master the current state of each lithium battery pack in real time.
In addition, the invention also provides a charging control method for parallel connection of multiple lithium battery packs, which adopts the charging control device for parallel connection of the multiple lithium battery packs to carry out charging control, and the charging control method for parallel connection of the multiple lithium battery packs comprises the following steps: 1) the method comprises the following steps that a plurality of lithium battery packs are connected in parallel in sequence through battery pack charging and discharging wiring harnesses and then connected to a power supply circuit of a control module through a voltage reduction module, connected in parallel in sequence through battery pack communication wiring harnesses and then connected to a communication transceiving circuit of the control module, and connected in parallel in sequence through charging request signal wiring harnesses and then connected to a charging instruction receiving circuit of the control module; 2) the charging input interface is connected with a charger; 3) a microcontroller in the control module controls the charging of the lithium battery pack with the lowest voltage in the lithium battery packs connected with the microcontroller; 4) when the charged voltage of the lithium battery pack with the lowest voltage is equal to the voltage of the lithium battery pack with the second lowest voltage, the microcontroller controls two groups of lithium battery packs with the lowest voltage and the second lowest voltage which are connected with the microcontroller to be charged in parallel; when the voltage of the lithium battery pack with the lowest voltage and the second lowest voltage after charging is equal to the voltage of the lithium battery pack with the third lowest voltage, the microcontroller controls the three groups of lithium battery packs with the lowest voltage, the second lowest voltage and the third lowest voltage connected with the microcontroller to be charged in parallel; 5) and 4) circulating the step 4), until the voltage of the plurality of lithium battery packs which are controlled by the microcontroller to be charged in parallel at the same time is equal to the voltage of the lithium battery pack with the highest voltage, controlling by the microcontroller to charge all the lithium battery packs connected with the microcontroller in parallel at the same time.
Further, after the charger is disconnected from the charging input interface, the single chip sends a command of closing the charging loop to all power management systems of the lithium battery pack which opens the charging loop.
According to the technical scheme, the word vector website intrusion detection method based on semantic analysis provided by the technical scheme of the invention has the following beneficial effects:
the invention discloses a charging control device and a charging control method for parallel connection of multiple lithium battery packs, wherein the control device comprises a plurality of lithium battery packs, a voltage reduction module, a control module and a charger; through control module and all lithium cell group communication connections, the charger need not to establish the communication with parallelly connected lithium cell group, only send the charging request to control module through the charging request line of parallel connection lithium cell group, control module combines the voltage information of each lithium cell group, corresponding lithium cell group charging circuit is opened in control, it charges to each lithium cell group in the lithium cell group safely in order, avoid because the electric quantity difference of each lithium cell group leads to the lithium cell group of high voltage to charge to the electric current of low voltage lithium cell group with being close the short circuit, reduce the injury of charging of lithium cell group, the life of extension lithium cell group. In addition, the communication transceiver circuit in the control module in the charging control device is used as a host of the control device, and the lithium battery pack, the control module and the charger are combined into a whole to be charged, so that the communication and charging efficiency is improved, the use convenience of a user is improved, and the control complexity and the development cost of the charging control device are reduced. In addition, because the charger does not need to customize a special communication system, and directly adopts standard charging equipment, the production cost of the charger is effectively reduced, and the charger is favorable for maintenance and replacement.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a diagram of an embodiment of the present invention;
FIG. 3 is a diagram of an embodiment of the present invention;
fig. 4 is a circuit diagram of a part of the control module according to the present invention.
The specific meaning of each mark in the figure is as follows: 1-control module, 11-communication transceiver circuit, 12-charging command receiving circuit, 13-supply circuit, 14-microcontroller, 2-voltage-reducing module, 3-first lithium battery pack, 31-first BMS module, 32-first charging input interface, 33-first microswitch, 4-second lithium battery pack, 41-second BMS module, 42-second charging input interface, 43-second microswitch, 5-third lithium battery pack, 51-third BMS module, 52-third charging input interface, 53-third microswitch, 6-charger, 61-charger body, 62-charger output terminal, 63-charging request line, 7-display module, 8-battery pack charging and discharging harness, 9-charging request signal wire harness, 10, battery pack communication wire harness.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings. In this disclosure, aspects of the present invention are described with reference to the drawings, in which illustrated embodiments are shown. Embodiments of the present disclosure are not intended to include all aspects of the present invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Some of the currently disclosed charging control devices for parallel connection of multiple lithium battery packs are provided with two sets of communication systems, so that the communication and work of each lithium battery pack cannot be stably realized, the production cost is increased, and the maintenance and the replacement are not facilitated; the invention aims to provide a charging control device and a charging control method for parallel connection of multiple lithium battery packs, which only adopt one set of communication system and have the advantages of simple structure, convenient use, safety and reliability.
The charging control device and the charging control method for parallel connection of multiple lithium battery packs according to the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a charging control device with multiple lithium battery packs connected in parallel includes a plurality of lithium battery packs, a control module 1, a voltage reduction module 2, and a charger 6; the lithium battery packs are connected in parallel in sequence by adopting battery pack charging and discharging harnesses 8 and then connected to the voltage reduction module 2, and the voltage reduction module 2 is connected to the control module 1; the lithium battery packs are respectively provided with a charging input interface which is used for connecting a charger 6; the control module 1 comprises a microcontroller 14, a power supply circuit 13 connected with the microcontroller 14, a communication transceiving circuit 11 and a charging instruction receiving circuit 12; the voltage reduction module 2 is connected to the power supply circuit 13 and used for the lithium battery pack to supply voltage to the control module 1 in a voltage stabilizing manner; the lithium battery packs are connected in parallel in sequence by battery pack communication wiring harnesses 10 and then connected to a communication transceiving circuit 11 and used for sending information of each lithium battery pack to a microcontroller 14; the lithium battery packs are connected in parallel in sequence by adopting charging request signal harnesses 9 and then connected to a charging instruction receiving circuit 12, and the charging request signal is sent to a microcontroller 14 by a charger 6; and the microcontroller 14 is configured to send a command for opening a charging loop to a power management system of each lithium battery pack according to the charging request signal and information of each lithium battery pack, so as to implement parallel charging of each lithium battery pack.
The microcontroller 14 is internally preset with a control program, the control program is used for sending a command of opening a charging loop to a power management system of a lithium battery pack with the lowest voltage by combining information of each lithium battery pack collected by the communication transceiving circuit 11 when the microcontroller 14 receives a charging request sent by the charger 6, starting the charging loop of the lithium battery pack to realize charging of the lithium battery pack, and sending the command of opening the charging loop to the power management system of the lithium battery pack with the second lowest voltage by the control program when the voltage of the lithium battery pack is equal to the voltage of the lithium battery pack with the second lowest voltage to realize simultaneous parallel charging of the two lithium battery packs; the judgment is repeated until the control program sends a command of opening a charging loop to a power management system of the lithium battery pack with the highest voltage, so that all the lithium battery packs connected with the control module 1 in parallel are charged in parallel at the same time; the lithium battery pack with the high voltage is prevented from being charged to the lithium battery pack with the current close to the short circuit due to the fact that the electric quantity of each lithium battery pack is different, charging damage of the lithium battery pack is reduced, and the service life of the lithium battery pack is prolonged.
In the embodiment of the present invention, three lithium battery packs are used to illustrate a detailed technical solution of the present invention, and the detailed technical solution of the present invention includes a first lithium battery pack 3, a second lithium battery pack 4 and a third lithium battery pack 5, where each lithium battery pack is provided with a charging input interface, for example, the first lithium battery pack 3 includes a first BMS module 31, a first charging input interface 32 and a first micro switch 33, the second lithium battery pack 4 includes a second BMS module 41, a second charging input interface 42 and a second micro switch 43, the third lithium battery pack 5 includes a third BMS module 51, a third charging input interface 52 and a third micro switch 53, and the first charging input interface 32, the second charging input interface 42 and the third charging input interface 52 can be inserted into and connected to the charger 6.
The control module 1 is connected with a first lithium battery pack 3, a second lithium battery pack 4 and a third lithium battery pack 5 which are connected in parallel, receives information of the first lithium battery pack 3, the second lithium battery pack 4 and the third lithium battery pack 5, comprises electric quantity information, voltage information, current information and fault information of the lithium battery packs, and reversely controls charging of each lithium battery pack according to the information; that is, the charger 6 is connected to a charging input interface of any lithium battery pack, such as the first charging input interface 32 of the first lithium battery pack 3, sends a charging request to the control module 1 through the first lithium battery pack 3, and opens a charging loop of the lithium battery pack with the lowest voltage by combining voltage information of the three lithium battery packs, and if the voltage of the third lithium battery pack 5 is the lowest and the voltage of the first lithium battery pack 3 is the highest, opens the charging loop of the third lithium battery pack 5, so as to charge the single battery of the third lithium battery pack 5; when the voltage of the third lithium battery pack 5 is equal to the voltage of the second lithium battery pack 4, a charging loop of the second lithium battery pack 4 is opened, and the two lithium battery packs of the second lithium battery pack 4 and the third lithium battery pack 5 are charged in parallel at the same time; when the voltages of the second lithium battery pack 4 and the third lithium battery pack 5 are equal to the voltage of the first lithium battery pack 3, the charging circuit of the first lithium battery pack 3 is opened, and at the moment, the charging circuits of the first lithium battery pack 3, the second lithium battery pack 4 and the third lithium battery pack 5 are all opened, so that the three lithium battery packs are charged in parallel. When the number of the lithium battery packs connected in parallel exceeds three, the control execution is also carried out according to the charging process until all the lithium battery packs are in the same voltage value and are connected in parallel for charging.
With reference to the specific implementation form of the charging control device with multiple parallel lithium battery packs shown in fig. 2, the power supply circuit 13 in the control module 1 is connected to the voltage reduction module 2, the voltage reduction module 2 is sequentially connected to the charge and discharge terminals P +, P "of the three parallel lithium battery packs, the communication transceiver circuit 11 in the control module 1 is sequentially connected to the BMS modules of the three parallel lithium battery packs, that is, the communication terminals of the first BMS module 31, the second BMS module 41, and the third BMS module 51, the control module 1 is a master, and the first lithium battery pack 3, the second lithium battery pack 4, and the third lithium battery pack 5 connected in parallel are slaves, so that the master and the slaves can communicate with each other; in the embodiment, the three listed lithium battery packs are connected end to end in pairs through the battery pack charging and discharging wiring harness 8, the charging request signal wiring harness 9 and the battery pack communication wiring harness 10, so that the multiple lithium battery packs are connected in parallel safely and reliably.
In the present invention, the charging request signal sent by the charger 6 to the microcontroller 14 includes, but is not limited to, a short circuit signal, a disconnection signal, a high level signal, and a low level signal, as listed.
Further referring to the embodiment shown in fig. 2, the charger 6 includes a charger main body 61, a charger output terminal 62 and a charging request line 63, wherein the charger main body 61 is connected to a charging power source for charging the lithium battery pack after receiving a command sent by the microcontroller 14 to open the charging loop; the charger output terminal 62 is connected to a charging input interface of any lithium battery pack, such as the third charging input interface 52, and includes a positive charging socket C + and a negative charging socket C + for connecting a charging and discharging harness of the battery pack, and the positive charging socket C + and the negative charging socket C + are respectively connected to a positive charging circuit and a negative charging circuit of the charging and discharging harness of the battery pack for communicating with the charging circuit of the lithium battery pack; the charging request line 3 is arranged in the charger output terminal 62 and is two signal terminals with internal short circuit, the signal terminals are inserted into the charging request signal wiring harness 9, the charging request signal wiring harness 9 is short-circuited at the same time, a short-circuit signal is generated and transmitted to the charging instruction receiving circuit 12, and the short-circuit signal is the charging request signal sent to the control module 1.
With reference to the embodiment shown in fig. 3, in this embodiment, the charger 6 directly adopts a common charger including a charger main body 61 and a charger output terminal 62, and at this time, a micro switch is provided inside the charging input interface of any lithium battery pack, the micro switch is connected to the charging request signal harness 9, the micro switch is initially in a normally open or normally closed state, and when the charger output terminal 62 is inserted into the charging input interface of any lithium battery pack, such as the third charging input interface 52, the charger output terminal 62 abuts against the switch of the third micro switch 53, so that the third micro switch 53 jumps to a normally closed or normally open state opposite to the initial state; for example, when the third microswitch 53 is in a normally open state, the charger output terminal 62 is plugged to make the third microswitch 53 in a normally closed state, and the charging request signal wire harness 9 is in a short-circuit state directly connected to the charging instruction receiving circuit 12, that is, a short-circuit signal is generated and transmitted to the microcontroller 14 of the control module 1; when the third microswitch 53 is in a normally closed state, the charger output terminal 62 is inserted to enable the third microswitch 53 to be in a normally open state, and the charging request signal wire harness 9 is in an open circuit state disconnected with the charging instruction receiving circuit 12, that is, an open circuit signal is generated and transmitted to the microcontroller 14 of the control module 1, wherein the short circuit signal and the open circuit signal are both charging request signals sent to the control module 1; in the embodiment, the common charger 6 is directly selected, so that the charging request signal is more conveniently sent, and the application is wider.
In other embodiments, if the charger 6 provides a high level signal corresponding to the voltage of the charging request signal line bundle 9 to the charging command receiving circuit 12, the high level signal is sent to the microcontroller 14 as the charging request signal, and the microcontroller 14 starts the charging control of the lithium battery packs connected in parallel when receiving the high level signal; or the charger 6 provides a low level signal corresponding to the voltage of the charging request signal wire harness 9 to the charging command receiving circuit 12, and the low level signal is used as the charging request signal to be sent to the microcontroller 14, and the microcontroller 14 starts charging control on the lithium battery packs connected in parallel after receiving the low level signal.
As further shown in fig. 2 and 3, the first BMS module 31, the second BMS module 41, and the third BMS module 51 transmit the state information of the respective lithium batteries to the communication transceiver circuit 11 of the control module 1 through the battery pack communication harness 10 and then to the microcontroller 14, when the charger output terminal 62 is plugged into a charging interface of any lithium battery pack, such as the first charging input interface 32, the second charging input interface 42 or the third charging input interface 52, the microcontroller 14 compares the voltages of the lithium battery packs after receiving the charge request signal, controls the BMS module of the lithium battery pack having the lowest voltage to open the charge loop thereof, other lithium cell group charging circuit all close, and when the voltage of two lithium cell groups was equal, these two lithium cell groups were opened simultaneously and were charged together to analogize to finally realize the parallelly connected charging of many lithium cell groups.
In some embodiments, the charging control device with multiple lithium battery packs connected in parallel is further provided with a display module 7 connected to the control module 1, and the display module 7 is used for displaying information such as electric quantity, voltage, current, charging, discharging, faults and the like of each lithium battery pack at present, so that a worker can conveniently master the state of each lithium battery pack at present in real time and timely handle an unexpected situation.
Fig. 4 shows one of the circuit implementations of the control module 1 of the present invention, wherein the microcontroller 14 is a single chip microcomputer of PIC16F1947, and the single chip microcomputer is marked as U1; the communication transceiver circuit 11 comprises a communication interface J1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a bidirectional transient suppression diode D1 and an RS485 communication chip U3; the communication interface J1 is connected with one end of a resistor R1 and one end of a resistor R2, the other end of a resistor R1 is connected with one end of a bidirectional transient suppression diode D1, the other end of a resistor R2 is connected with the other end of a bidirectional transient suppression diode D1, two ends of a resistor R4 are connected with one end of a resistor R1 and one end of a resistor R2, one end of a resistor R3 is connected with one end of a resistor R4 and is also connected with a port B of the communication chip U3, the other end of a resistor R3 is grounded, one end of a resistor R5 is connected with the other end of a resistor R4 and is also connected with a port a of the communication chip U3, the other end of a resistor R5 is connected with a power supply +5V, a VCC port of the communication chip U3 is connected with a power supply +5V, a GND port is grounded, a RE port and a DE port of the communication chip U3 are connected with one end of a resistor R8, the other end of a resistor R8 is connected with an RG 8 of the communication chip U8, the device is connected with RG2 of the single chip microcomputer U1, the other end of the resistor R6 is connected with +5V of a power supply, a DI port of the communication chip U3 is connected with one end of the resistor R7, the DI port of the communication chip U3 is connected with RG1 of the single chip microcomputer U1, and the other end of the resistor R7 is connected with +5V of the power supply.
The charging instruction receiving circuit 12 comprises an instruction interface J2, a resistor R9, a resistor R10, a resistor R11, a PC817 optical coupling isolation chip U4, a capacitor C1, an instruction interface J2 one end is grounded, another end is connected with the IN-port of an optical coupling isolation chip U4, a terminal power supply +5V of the resistor R9, another end is connected with the IN + port of the optical coupling isolation chip U4, the C port of the optical coupling isolation chip U4 is connected with one end of the resistor R10, the other end of the resistor R10 is connected with the resistor R11, the capacitor C1 and the RA2 of the single chip microcomputer U1, the other terminal power supply +5V of the resistor R11 is grounded, the other end of the capacitor is grounded, and the E port of the optical coupling isolation chip U4 is grounded.
The power supply circuit 13 comprises a power interface J3, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and an HT7550 power chip U2, wherein one ends of the capacitor C2, the capacitor C3, the capacitor C4 and the capacitor C5 are connected and grounded, the other ends of the capacitor C2 and the capacitor C3 are connected with one end of the power interface J3 and the IN port of the power chip U2, the other end of the power interface J3 is grounded, the other end of the capacitor C4 and the other end of the capacitor C5 are connected with the OUT port of the power chip U2 and the VDD port of the singlechip U1, and the GND port of the power chip U2 is grounded.
Fig. 4 shows only one circuit implementation structure of the control module 1 of the present invention, and the present invention does not only disclose the above-mentioned control circuit, but also other circuit components capable of implementing the control process of the present invention are within the protection scope of the present invention.
Based on the specific composition of the charging control device with the multiple lithium battery packs connected in parallel, the invention also discloses a charging control method for controlling charging by adopting the charging control device with the multiple lithium battery packs connected in parallel, which comprises the following steps: 1) a plurality of lithium battery packs are connected in parallel in sequence by battery pack charging and discharging harnesses 8 and then connected to a power supply circuit 13 of a control module 1 through a voltage reduction module 2, connected in parallel in sequence by battery pack communication harnesses 10 to a communication transceiving circuit 11 of the control module 1, and connected in parallel in sequence by a charging request signal harness 9 to a charging instruction receiving circuit 12 of the control module 1; 2) the charger 6 is connected with any one charging input interface on the multi-lithium battery pack connected in parallel; 3) a microcontroller 14 in the control module 1 controls charging of a lithium battery pack with the lowest voltage in a plurality of lithium battery packs connected with the microcontroller; 4) when the charged voltage of the lithium battery pack with the lowest voltage is equal to the voltage of the lithium battery pack with the second lowest voltage, the microcontroller 14 controls the two groups of lithium battery packs with the lowest voltage and the second lowest voltage which are connected with the microcontroller to be charged in parallel; when the charged voltage of the lithium battery packs with the lowest voltage and the second lowest voltage is equal to the voltage of the lithium battery pack with the third lowest voltage, the microcontroller 14 controls the three groups of lithium battery packs with the lowest voltage, the second lowest voltage and the third lowest voltage to be charged in parallel; 5) the step 4) is circulated until the voltage of the plurality of lithium battery packs which are simultaneously charged in parallel is controlled by the microcontroller 14 to be equal to the voltage of the lithium battery pack with the highest voltage, and the microcontroller 14 is controlled to simultaneously charge all the lithium battery packs connected with the microcontroller in parallel; the situation that the high-voltage lithium battery pack is charged to the low-voltage lithium battery pack by the current close to the short circuit due to different electric quantities of the lithium battery packs is avoided. When the charger is disconnected from the charging input interface, the microcontroller 14 sends a command for closing the charging loop to the power management systems of all the lithium battery packs with the charging loops opened, and stops charging the lithium battery packs.
The charging control device and the charging control method for the parallel connection of the multiple lithium battery packs are characterized in that only the control module 1 is in communication connection with each lithium battery pack to sequentially and safely charge each lithium battery pack in the lithium battery packs in order, so that the situation that the high-voltage lithium battery pack charges the low-voltage lithium battery pack with the current close to the short circuit due to different electric quantities of each lithium battery pack is avoided, the charging damage of the lithium battery packs is reduced, the service life of the lithium battery packs is prolonged, the complexity and the development cost of the charging control device and the charging control method are reduced, the communication and charging efficiency is improved, and the use convenience of users is improved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (6)
1. A charging control device with multiple lithium battery packs connected in parallel is characterized by comprising a plurality of lithium battery packs, a voltage reduction module, a control module and a charger connected with the lithium battery packs;
the lithium battery packs are connected in parallel in sequence by adopting battery pack charging and discharging wire harnesses and then connected to the voltage reduction module, and the voltage reduction module is connected to the control module; the control module comprises a microcontroller, a power supply circuit, a communication transceiving circuit and a charging instruction receiving circuit, wherein the power supply circuit, the communication transceiving circuit and the charging instruction receiving circuit are connected to the microcontroller; the voltage reduction module is connected to the power supply circuit and used for voltage stabilization and power supply of the control module by the lithium battery packs connected in parallel; the lithium battery packs are connected in parallel in sequence by adopting battery pack communication wiring harnesses and then connected to the communication transceiving circuit and used for sending information of each lithium battery pack to the microcontroller; the communication transceiving circuit is used for receiving information of each lithium battery pack, wherein the information comprises electric quantity information, voltage information, current information and fault information of the lithium battery pack; the lithium battery packs are connected in parallel in sequence by adopting charging request signal wire harnesses and then connected to a charging instruction receiving circuit, and the charging instruction receiving circuit is used for sending a charging request signal to the microcontroller by a charger; the charging request signal comprises a short circuit signal, a circuit break signal, a high level signal and a low level signal;
the charger comprises a charger main body, a charger output terminal and a charging request line; the charger main body is connected with a charging power supply and is used for charging the lithium battery pack; the charger output terminal is connected with any lithium battery pack and comprises an anode charging socket and a cathode charging socket which are used for connecting a charging and discharging wire harness of the battery pack, and the anode charging socket and the cathode charging socket are respectively connected with the anode and the cathode of the charging and discharging wire harness of the battery pack and are used for being communicated with a charging circuit of the lithium battery pack; the charging request line is connected to the charging instruction receiving circuit;
the control program is used for sending a command for opening a charging loop to a power management system of the lithium battery pack with the lowest voltage by combining the information of each lithium battery pack collected by the communication transceiving circuit when the microcontroller receives a charging request sent by the charger, and starting the charging loop of the lithium battery pack to realize the charging of the lithium battery pack; when the voltage of the charged lithium battery pack is equal to the voltage of the lithium battery pack with the second lowest voltage, a command for opening a charging loop is sent to a power supply management system of the lithium battery pack with the second lowest voltage, and the two lithium battery packs are charged in parallel at the same time; and repeating the judgment until the control program sends a command of opening a charging loop to the power management system of the lithium battery pack with the highest voltage, so that all the lithium battery packs connected with the control module in parallel are charged in parallel at the same time.
2. The parallel charging control device of claim 1, wherein the charging request line is disposed in the output terminal of the charger and is two internally short-circuited signal terminals, and the signal terminals are plugged in the charging command receiving circuit for sending a short-circuit signal to the control module.
3. The parallel charging control device of multiple lithium battery packs according to claim 1, wherein the charger includes a charger main body and a charger output terminal; the charger main body is connected with a charging power supply and is used for charging the lithium battery pack; the charger output terminal is connected with any lithium battery pack and comprises an anode charging socket and a cathode charging socket which are used for connecting a charging and discharging wire harness of the battery pack, and the anode charging socket and the cathode charging socket are respectively connected with the anode and the cathode of the charging and discharging wire harness of the battery pack and are used for being communicated with a charging circuit of the lithium battery pack;
any one of the lithium battery packs is provided with a charging input interface, a microswitch is arranged in the charging input interface, and the microswitch is connected with a charging request signal wire harness; the microswitch is in a normally open state or a normally closed state initially, and when the output terminal of the charger is plugged into the charging input interface of any lithium battery pack, the output terminal of the charger is abutted to the switch of the microswitch, so that the microswitch jumps to a normally closed state or a normally open state opposite to the initial state and is used for sending a short circuit signal or a circuit breaking signal to the control module.
4. The parallel charging control device of claim 1, further comprising a display module connected to the control module, wherein the display module is configured to display information of current charge, voltage, current, charge, discharge and fault of each lithium battery pack.
5. A charging control method for parallel connection of multiple lithium battery packs, characterized in that the charging control device for parallel connection of multiple lithium battery packs according to any one of claims 1 to 4 is used for charging control, and the charging control method for parallel connection of multiple lithium battery packs comprises:
1) the method comprises the following steps that a plurality of lithium battery packs are connected in parallel in sequence by battery pack charging and discharging wiring harnesses and then connected to a power supply circuit connected to a control module through a voltage reduction module, connected in parallel in sequence by battery pack communication wiring harnesses and then connected to a communication transceiving circuit of the control module, and connected in parallel in sequence by charging request signal wiring harnesses and then connected to a charging instruction receiving circuit of the control module;
2) the charging input interface is connected with a charger;
3) a microcontroller in the control module controls the charging of the lithium battery pack with the lowest voltage in the lithium battery packs connected with the microcontroller;
4) when the charged voltage of the lithium battery pack with the lowest voltage is equal to the voltage of the lithium battery pack with the second lowest voltage, the microcontroller controls two groups of lithium battery packs with the lowest voltage and the second lowest voltage which are connected with the microcontroller to be charged in parallel; when the voltage of the lithium battery pack with the lowest voltage and the second lowest voltage after charging is equal to the voltage of the lithium battery pack with the third lowest voltage, the microcontroller controls the three groups of lithium battery packs with the lowest voltage, the second lowest voltage and the third lowest voltage connected with the microcontroller to be charged in parallel;
5) and 4) the step 4) is repeated, until the voltage of the plurality of lithium battery packs which are simultaneously charged in parallel under the control of the microcontroller is equal to the voltage of the lithium battery pack with the highest voltage, the microcontroller controls the plurality of lithium battery packs which are simultaneously charged in parallel to be simultaneously charged in parallel.
6. The method of claim 5, wherein the microcontroller issues a command to close the charging loop to the power management system of all lithium battery packs that open the charging loop after the charger is disconnected from the charging input interface.
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| JP7244635B2 (en) * | 2020-03-27 | 2023-03-22 | 東莞新能安科技有限公司 | Charge/discharge management method, electronic device, and electrical system for parallel-connected battery set |
| CN111584953A (en) * | 2020-05-08 | 2020-08-25 | 重庆北斗捷安新能源科技有限公司 | Lithium battery connection structure of multi-lithium battery electric vehicle and automatic identification method thereof |
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| US9276463B2 (en) * | 2010-04-05 | 2016-03-01 | Macaulay-Brown, Inc. | Low power conversion and management of energy harvesting applications |
| CN102082307B (en) * | 2010-12-31 | 2013-08-07 | 华为技术有限公司 | Method and system for parallel use of lithium battery modules |
| JP5790767B2 (en) * | 2011-09-21 | 2015-10-07 | トヨタ自動車株式会社 | VEHICLE BATTERY CONTROL DEVICE AND VEHICLE BATTERY CONTROL METHOD |
| CN102931702B (en) * | 2012-10-25 | 2014-12-17 | 华为技术有限公司 | Battery unit parallel system, device and battery unit parallel method |
| US9627897B2 (en) * | 2014-10-30 | 2017-04-18 | General Electric Company | String current limited battery charging control |
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