CN110266066A - Charging control device and charging control method for parallel connection of multiple lithium battery packs - Google Patents

Abstract

The charging control device and charging control method for parallel connection of multiple lithium battery packs provided by the present invention relate to the field of energy storage power supply, including several lithium battery packs, step-down modules, control modules and chargers; the lithium battery packs are provided with a charger connected The charging input interface, each lithium battery pack is connected in parallel to the control module through the step-down module in turn; the control module includes a microcontroller, connected to the power supply circuit of the microcontroller, the communication transceiver circuit and the charging command receiving circuit; the structure of the present invention is simple, There is no need for a charger to establish communication with the battery pack, and the control module communicates with all lithium battery packs, and combines the voltage information of each lithium battery pack to control the corresponding charging circuit of the lithium battery pack to charge each lithium battery in the lithium battery pack safely and orderly. Pack charging; the present invention combines a lithium battery pack, a control module, and a charger for charging control, improves communication and charging efficiency, improves user convenience, and reduces the complexity and development cost of charging control device control.

Description

Charging control device and charging control method for parallel connection of multiple lithium battery packs

technical field

The invention relates to the field of energy storage power sources, in particular to a charging control device and a charging control method for parallel connection of multiple lithium battery packs.

Background technique

At present, household backup power is mainly based on small and medium-sized gasoline and diesel generator sets. However, due to the lack of future oil resources, the noise of generators, and air pollution, there is a greater market demand for new energy storage backup power, such as solar energy. Energy storage, wind energy storage, etc. At present, energy storage batteries are mainly lead-acid batteries and lithium battery packs. Due to the low energy density, large volume and heavy weight of lead-acid batteries, they are gradually replaced by lithium battery packs in the field of energy storage. Lithium battery packs have become a new field in this field favorite.

At present, the use of lithium battery packs is more complicated than that of lead-acid batteries, and a BMS module (battery management system) is required to detect the cells in real time and control the safe charging and discharging of the battery pack. Due to the user's demand for battery capacity and convenience, it is often necessary to connect lithium battery packs in parallel to extend the power consumption time. As we all know, each lithium battery pack cannot be directly connected in parallel due to different power levels, otherwise the high-voltage battery pack will charge the low-voltage battery pack with a current close to a short circuit, and the lithium battery pack BMS will enter short-circuit protection and fail to work normally. How to realize the parallel connection of multiple lithium battery packs and charge and discharge them safely and reliably is a difficult problem that we need to overcome.

At present, there are related research institutions that use custom lithium battery pack chargers with serial communication such as RS485 to charge multiple lithium battery packs. For example, CN201410056812.8 patent discloses a control system and method for realizing parallel cycle charging of multiple sets of lithium batteries. The system includes: a charger, multiple sets of lithium batteries, a charging circuit and a communication line set. The specific method of use is: first connect multiple battery packs in parallel and then separate them from the main control board and the load. The battery charger has a built-in communication module, which acts as the host of the entire system, establishes communication with the parallel lithium battery packs, and then charges each lithium battery pack one by one. . Although this method solves the charging problem of the lithium battery pack, it cannot charge the lithium battery pack, the control board, the load, and the charger in one, because the entire system has two hosts (the control board and the charger), which cannot work normally. Communication and work, and reduce the convenience of users. At the same time, it is necessary to customize a special lithium battery pack charger with a built-in communication system. It is not a standard battery charging device, which increases the cost and is not conducive to maintenance and replacement.

Contents of the invention

The object of the present invention is to provide a charging control device and a charging control method for parallel connection of multiple lithium battery packs, which are simple in structure, easy to use, safe and reliable.

In order to achieve the above object, the present invention proposes the following technical solution: a charging control device for parallel connection of multiple lithium battery packs, including several lithium battery packs, step-down modules, control modules and chargers; The discharge wiring harness is connected in parallel to the step-down module in turn, and the step-down module is connected to the control module; the control module includes a microcontroller, and the microcontroller is a single-chip microcomputer with a model of PIC16F1947, connected to the power supply circuit and communication transceiver circuit of the microcontroller and a charging command receiving circuit; the step-down module is connected to the power supply circuit for the lithium battery pack to supply power to the control module; the lithium battery packs are connected in parallel with the battery pack communication harness in turn and then connected to the communication transceiver circuit for Send the information of each lithium battery pack to the microcontroller; the lithium battery packs are connected in parallel with the charging request signal harness in turn and connected to the charging command receiving circuit for the charger to send a charging request signal to the microcontroller; the microcontroller The device is used to send a command to open the charging circuit to the 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 parallel charging of each lithium battery pack.

Further, the microcontroller is preset with a control program, and the control program is used to transfer the information of each lithium battery pack collected by the communication transceiver circuit to the lithium battery pack with the lowest voltage when the microcontroller receives a charging request from the charger. The power management system of the power management system issues a command to open the charging circuit, starts the charging circuit of the lithium battery pack, and realizes the charging of the lithium battery pack, and when the voltage of the lithium battery pack is equal to the voltage of the lithium battery pack with the second lowest voltage, The control program sends a command to open the charging circuit to the power management system of the lithium battery pack with the second lowest voltage, so as to realize parallel charging of the two lithium battery packs at the same time; reciprocating judgment and analogy until the control program sends a command to the power management system of the lithium battery pack with the highest voltage. The system issues a command to open the charging circuit to realize simultaneous parallel charging of all lithium battery packs connected in parallel with the control module; effectively avoiding the communication connection between the charger and each lithium battery pack, the communication is simple, and only the control module is used as the host mode, which is effective Improve the user's convenience for charging multiple lithium battery packs in parallel.

Further, the charging request signal sent by the charger to the microcontroller includes a short circuit signal, a circuit break signal, a high level signal and a low level signal.

Further, the charger includes a charger main body, a charger output terminal and a charging request line, the charger main body is connected to a charging power supply for charging the lithium battery pack; the charger output terminal is connected to any lithium battery The battery pack includes a positive pole and a negative pole charging socket for connecting the charging and discharging wire harness of the battery pack, and the positive pole and the negative pole charging socket are respectively connected to the positive pole and the negative pole of the battery pack charging and discharging wire harness, and are used to communicate with the charging circuit of the lithium battery pack; The charging request line is set in the output terminal and is two internal short-circuit signal terminals. The signal terminal is connected to the charging command receiving circuit to send a short-circuit signal to the control module, so that the setting of the charging request signal is simple and safe.

Further, the charger includes a charger main body and a charger output terminal; the charger main body is connected to a charging power source for charging a lithium battery pack; the charger output terminal is connected to any lithium battery pack, including It is used to connect the positive and negative charging sockets of the charging and discharging wire harness of the battery pack, and the positive and negative charging sockets are respectively connected to the positive and negative poles of the charging and discharging wire harness of the battery pack, and are used to connect the charging circuit of the lithium battery pack; Any lithium battery pack in the battery pack is provided with a charging input interface, and the charging input interface is provided with a micro switch inside, and the micro switch is connected to the charging request signal harness; the micro switch is initially normally open or normally Closed state, 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 in contact with the switch of the micro switch, so that the micro switch jumps to the normal closed position opposite to the initial state. Or normally open state, used to send a short circuit signal or open circuit signal to the control module; the charger directly uses an ordinary charger, which is more convenient to use.

Further, the charging control device for parallel connection of multiple lithium battery packs also includes a display module connected to the control module, and the display module is used to display information such as power, voltage, current, charge, discharge and fault of each lithium battery pack at present, so as to facilitate The staff can grasp the current status of each lithium battery pack in real time.

In addition, the present invention also provides a charging control method for parallel connection of multiple lithium battery packs, which uses the above-mentioned charging control device for parallel connection of multiple lithium battery packs to perform charging control, and the charging control method for parallel connection of multiple lithium battery packs includes: 1) Several lithium battery packs are sequentially connected in parallel with the battery pack charging and discharging harness, and then connected to the power supply circuit of the control module through the step-down module; Connected to the charging instruction receiving circuit of the control module; 2) using the charging input interface to connect with the charger; 3) the microcontroller in the control module controls charging the lithium battery pack with the lowest voltage among the several lithium battery packs connected to it; 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 the parallel charging of the two lithium battery packs with the lowest voltage and the second lowest voltage connected to it at the same time ; When the charged voltage of the lithium battery pack 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 controls the three lowest, second lowest and third lowest voltage connected to it at the same time. 5) cycle step 4), until the voltage after charging of several lithium battery packs 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 battery connected to it at the same time All lithium battery packs are charged in parallel.

Further, when the charger is disconnected from the charging input interface, the single-chip microcomputer sends a command to close the charging circuit to the power management systems of all lithium battery packs that have opened the charging circuit.

It can be seen from the above technical solution that the semantic analysis-based word vector website intrusion detection method provided by the technical solution of the present invention has obtained the following beneficial effects:

The invention discloses a charging control device and a charging control method for parallel connection of multiple lithium battery packs. The control device includes several lithium battery packs, a step-down module, a control module and a charger; the control module communicates with all lithium battery packs to charge The device does not need to establish communication with the parallel lithium battery pack, but only sends a charging request to the control module through the charging request line connected in parallel to the lithium battery pack, and the control module combines the voltage information of each lithium battery pack to control and open the corresponding lithium battery pack charging circuit. Safely and orderly charge each lithium battery pack in the lithium battery pack, avoiding the high-voltage lithium battery pack charging the low-voltage lithium battery pack with a current close to a short circuit due to the different power of each lithium battery pack, reducing the lithium battery pack Charging damage, prolonging the service life of the lithium battery pack. Moreover, the communication transceiver circuit in the control module of the charging control device of the present invention is used as the host of the control device, and the lithium battery pack, the control module and the charger are combined to charge as a whole, which is conducive to improving communication and charging efficiency and improving user convenience. Sex, reducing the complexity and development cost of charging control device control. In addition, since the charger does not need to customize a special communication system, it directly uses standard charging equipment, which effectively reduces the production cost of the charger and facilitates the maintenance and replacement of the charger.

Description of drawings

The figures 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 reference numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of the various aspects of the 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 the specific embodiment figure of the present invention;

Fig. 3 is the specific embodiment figure of the present invention;

Fig. 4 is a partial circuit diagram of the control module of the present invention.

The specific meanings of the marks in the figure are: 1-control module, 11-communication transceiver circuit, 12-charging command receiving circuit, 13-power supply circuit, 14-microcontroller, 2-step-down module, 3-the first lithium battery Group, 31-the first BMS module, 32-the first charging input interface, 33-the first micro switch, 4-the second lithium battery pack, 41-the second BMS module, 42-the second charging input interface, 43- The second micro switch, 5- the third lithium battery pack, 51- the third BMS module, 52- the third charging input interface, 53- the third micro switch, 6- the charger, 61- the main body of the charger, 62- Charger output terminal, 63-charging request line, 7-display module, 8-battery pack charging and discharging harness, 9-charging request signal harness, 10, battery pack communication harness.

Detailed ways

In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows. Aspects of the invention are described in this disclosure with reference to the accompanying drawings, in which illustrated embodiments are shown. The embodiments of the present disclosure are not defined to encompass all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of numerous ways, since the concepts and embodiments disclosed herein are not limited to any 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.

Based on how to effectively realize the parallel connection of multi-lithium battery packs and safely and reliably charge and discharge them, it is a common technical problem in the prior art. Currently, some charging control devices for parallel connection of multi-lithium battery packs are provided with two sets of communication systems. , the communication and work of each lithium battery pack cannot be realized stably, the production cost increases and it is not conducive to maintenance and replacement; system, simple in structure, easy to use, safe and reliable.

The charging control device and charging control method for parallel connection of multi-lithium battery packs of the present invention will be further specifically introduced below in conjunction with the accompanying drawings.

As shown in FIG. 1 , a charging control device with multiple lithium battery packs connected in parallel includes several lithium battery packs, a control module 1, a step-down module 2 and a charger 6; After being connected in parallel in turn, it is connected to the step-down module 2, and the step-down module 2 is connected to the control module 1; each of the lithium battery packs is provided with a charging input interface, and the charging input interface is used to connect the charger 6; the control module 1 Comprising a microcontroller 14, connected to the power supply circuit 13 of the microcontroller 14, a communication transceiver circuit 11 and a charging command receiving circuit 12; Voltage power supply; the several lithium battery packs are connected in parallel with the battery pack communication harness 10 in turn and then connected to the communication transceiver circuit 11 for sending the information of each lithium battery pack to the microcontroller 14; the several lithium battery packs use the charging request signal The wiring harness 9 is connected in parallel with the charging instruction receiving circuit 12 in turn, and is used for the charger 6 to send a charging request signal to the microcontroller 14; The power management system of the lithium battery pack issues a command to open the charging circuit to realize parallel charging of each lithium battery pack.

Wherein, a control program is preset in the microcontroller 14, and the control program is used for charging the lithium battery with the lowest voltage in combination with the information of each lithium battery pack collected by the communication transceiver circuit 11 when the microcontroller 14 receives the charging request sent by the charger 6. The power management system of the group issues a command to open the charging circuit, starts the charging circuit of the lithium battery group, and realizes the charging of the lithium battery group, and when the voltage of the lithium battery group is equal to the voltage of the lithium battery group with the second lowest voltage , the control program sends a command to open the charging circuit to the power management system of the lithium battery pack with the second lowest voltage, so as to realize simultaneous parallel charging of the two lithium battery packs; the reciprocating judgment cycle continues until the control program sends a command to the power supply of the lithium battery pack with the highest voltage. The management system issues a command to open the charging circuit to realize simultaneous parallel charging of all lithium battery packs connected in parallel with the control module 1; to avoid the high-voltage lithium battery packs approaching the low-voltage lithium battery packs due to the different power levels of each lithium battery pack. Short-circuit current for charging, reducing the charging damage of the lithium battery pack and prolonging the service life of the lithium battery pack.

In the embodiment of the present invention, three sets of lithium battery packs are used to illustrate the detailed technical scheme of the present invention, including the first lithium battery pack 3, the second lithium battery pack 4 and the third lithium battery pack 5, wherein each lithium battery pack Each is provided with a charging input interface, such as the first lithium battery pack 3 includes the first BMS module 31, the first charging input interface 32 and the first micro switch 33, and the second lithium battery pack 4 includes the second BMS module 41, the second Two charging input interface 42 and the second micro switch 43, the third lithium battery pack 5 includes the third BMS module 51, the third charging input interface 52 and the third micro switch 53, the first charging input interface 32, the second charging Both the input interface 42 and the third charging input interface 52 can be plugged into and connected to the charger 6 .

The control module 1 connects the first lithium battery pack 3, the second lithium battery pack 4 and the third lithium battery pack 5 in parallel, and receives the first lithium battery pack 3, the second lithium battery pack 4 and the third lithium battery pack 5 information, including the power information, voltage information, current information and fault information of the lithium battery pack, and reversely control the charging of each lithium battery pack according to the above information; that is, the charger 6 is connected to the charging input of any lithium battery pack The interface, 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 combines the voltage information of the three lithium battery packs to turn on the lithium battery pack with the lowest voltage. Charging circuit, as when 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, then open the charging circuit of the third lithium battery pack 5 to realize single-cell charging of the third lithium battery pack 5; When the voltage of the three lithium battery packs 5 is equal to the voltage of the second lithium battery pack 4, the charging circuit of the second lithium battery pack 4 is opened to realize two groups of lithium battery packs of the second lithium battery pack 4 and the third lithium battery pack 5 while charging in parallel; when the voltage of the second lithium battery pack 4 and the third lithium battery pack 5 is equal to the voltage of the first lithium battery pack 3, the charging circuit of the first lithium battery pack 3 is opened, and the first lithium battery pack The charging circuits of the group 3, the second lithium battery group 4 and the third lithium battery group 5 are all opened, so that the simultaneous parallel charging of the three lithium battery groups is realized. When there are more than three lithium battery packs connected in parallel, the above-mentioned charging process control is also performed until all lithium battery packs are charged in parallel at the same voltage value.

In combination with the specific implementation form of the charging control device for parallel connection of multiple lithium battery packs shown in FIG. The discharge terminals P+, P-, the communication transceiver circuit 11 in the control module 1 are sequentially connected to the BMS modules of three parallel lithium battery packs, that is, the communication between the first BMS module 31, the second BMS module 41 and the third BMS module 51. terminal, the control module 1 is the host, and the first lithium battery pack 3, the second lithium battery pack 4 and the third lithium battery pack 5 connected in parallel are slave machines, which realize the mutual communication between the host machine and the slave machine. There can be multiple slave machines in the invention, and only three lithium battery packs are listed in the embodiment; in the embodiment, the three lithium battery packs listed are connected through the battery pack charge and discharge harness 8, the charging request signal harness 9, and the battery pack communication The wire harnesses 10 are connected end-to-end in pairs, realizing safe and reliable parallel connection of multiple lithium battery packs.

In the present invention, the charging request signal sent by the charger 6 to the microcontroller 14 includes but not limited to the listed short circuit signal, open circuit signal, high level signal and low level signal.

Further in conjunction with 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 the lithium battery pack to receive After the command of opening the charging circuit sent by the microcontroller 14, the lithium battery pack is charged; the charger output terminal 62 is connected to the charging input interface of any lithium battery pack, such as the third charging input interface 52, including the charging input interface for connecting the battery pack. The positive and negative charging sockets C+ and C- of the charging and discharging wiring harness are respectively connected to the positive and negative electrodes of the charging and discharging wiring harness of the battery pack, and are used to connect to the charging circuit of the lithium battery pack; The request line 3 is set in the output terminal 62 and is two internally short-circuited signal terminals. The signal terminals are plugged into the charging request signal harness 9, and the charging request signal harness 9 is short-circuited at the same time to generate a short-circuit signal and transmit it to the charging command receiving circuit 12. , the short circuit signal is the charging request signal sent to the control module 1 .

In conjunction with the embodiment shown in Figure 3, the charger 6 in this embodiment directly adopts a common charger comprising a charger main body 61 and a charger output terminal 62, and at this time, a micro charger is provided inside the charging input interface of any lithium battery pack. The micro switch is connected to the charging request signal harness 9, and the micro switch is initially in the normally open or normally closed state. When the charger output terminal 62 is plugged into the charging input interface of any lithium battery pack, as shown in the first Three charging input interfaces 52, the charger output terminal 62 is in contact with the switch of the third micro switch 53, so that the third micro switch 53 jumps to the normally closed or normally open state opposite to the initial state; for example, when the third micro switch The dynamic switch 53 is in the normally open state. After the charger output terminal 62 is plugged in, the third micro switch 53 is in the normally closed state, and the charging request signal harness 9 is in a short circuit state directly connected to the charging command receiving circuit 12, that is, a short circuit occurs. The signal is transmitted to the microcontroller 14 of the control module 1; when the third microswitch 53 is in the normally closed state, the charger output terminal 62 is plugged in so that the third microswitch 53 is in the normally open state, and the charging request signal harness 9 is in the In the open circuit state disconnected from the charging command receiving circuit 12, that is, a circuit break signal is generated and transmitted to the microcontroller 14 of the control module 1. Both the short circuit signal and the circuit break signal are charging request signals sent to the control module 1; this embodiment directly selects a common The charger 6 makes the sending of the charging request signal more convenient and more widely used.

In other embodiments, as provided in the charger 6, a high-level signal relative to the voltage of the charging request signal wire harness 9 is sent to the charging command receiving circuit 12, and the high-level signal is sent to the microcontroller as a charging request signal 14, the microcontroller 14 receives the high-level signal and starts charging control to the parallel lithium battery pack; or the charger 6 provides a low-level signal relative to the voltage of the charging request signal harness 9 to the charging command receiving circuit 12, The low-level signal is then sent to the microcontroller 14 as a charging request signal, and the microcontroller 14 starts charging control to the parallel-connected lithium battery packs upon receiving the low-level signal.

Further combined with Fig. 2 and Fig. 3, the first BMS module 31, the second BMS module 41 and the third BMS module 51 send the status information of their respective lithium battery packs to the control module 1 through the battery pack communication harness 10 After the communication transceiver circuit 11 to the microcontroller 14, when the charger output terminal 62 is plugged into any charging interface of a 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 charging request signal, controls the BMS module of the lithium battery pack with the lowest voltage to open its charging circuit, and closes the charging circuits of other lithium battery packs. When the voltages of the two lithium battery packs are equal, the two lithium battery packs are turned on at the same time to charge together, and so on, finally realizing the parallel charging of multiple lithium battery packs.

In some embodiments, the charging control device with multiple lithium battery packs connected in parallel is also provided with a display module 7 connected to the control module 1, and the display module 7 is used to display the current electric quantity, voltage, current, charging, and discharging of each lithium battery pack. And fault information, so that the staff can grasp the current status of each lithium battery pack in real time, and deal with unexpected situations in time.

Fig. 4 is shown as a kind of many circuit realization forms of control module 1 of the present invention, and wherein, microcontroller 14 selects the single-chip microcomputer of PIC16F1947 model for use, and single-chip microcomputer is marked as U1; Described communication transceiver circuit 11 comprises communication interface J1, resistance R1, Resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, bidirectional transient suppression diode D1, RS485 communication chip U3; the communication interface J1 is connected to one end of resistor R1 and resistor R2, and the other end of resistor R1 One end is connected to one end of the bidirectional transient suppression diode D1, the other end of the resistor R2 is connected to the other end of the bidirectional transient suppression diode D1, the two ends of the resistor R4 are connected to one end of the resistor R1 and the resistor R2, and one end of the resistor R3 is connected to the resistor R4 One end of the communication chip U3 is connected to the B port of the communication chip U3, the other end of the resistor R3 is grounded, one end of the resistor R5 is connected to the other end of the resistor R4, and is connected to the A port of the communication chip U3, and the other end of the resistor R5 is connected to Power supply +5V, the VCC port of the communication chip U3 is connected to the power supply +5V, the GND port is grounded, the RE port of the communication chip U3 is connected to the DE port, and connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the The RG3 of the single-chip microcomputer U1 is connected, the RO port of the communication chip U3 is connected with the resistor R6, and is connected with the RG2 of the single-chip microcomputer U1 at the same time, and the other end of the resistor R6 is connected with the power supply +5V. The DI of the communication chip U3 The port is connected with one end of the resistor R7, and is connected with the RG1 of the single-chip microcomputer U1 at the same time, and the other end of the resistor R7 is connected with the power supply +5V.

The charging command receiving circuit 12 includes a command interface J2, a resistor R9, a resistor R10, a resistor R11, a PC817 optocoupler isolation chip U4, and a capacitor C1. One end of the command interface J2 is grounded, and the other end is connected to the optocoupler isolation chip U4 One end of the resistor R9 is connected to the power supply +5V, the other end is connected to the IN+ port of the optocoupler isolation chip U4, the C port of the optocoupler isolation chip U4 is connected to one end of the resistor R10, and the other end of the resistor R10 Connect with resistor R11, capacitor C1 and RA2 of the single-chip microcomputer U1, the other end of the resistor R11 is connected to the power supply +5V, the other end of the capacitor is grounded, and the E port of the optocoupler isolation chip U4 is grounded.

Described power supply circuit 13 comprises power interface J3, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, HT7550 power supply chip U2, wherein electric capacity C2, electric capacity C3, electric capacity C4, one end of electric capacity C5 are connected and grounded, electric capacity C2, electric capacity C3 The other end of the power supply interface J3 is connected to one end of the power supply interface J3, and is also connected to the IN port of the power supply chip U2. The OUT port of the power supply chip U2 is connected to the VDD port of the single-chip microcomputer U1, and the GND port of the power chip U2 is grounded.

Figure 4 shows only a circuit implementation structure of the control module 1 of the present invention. The present invention not only discloses the above-mentioned control circuit, but other circuit components that can realize the control process of the present invention are also within the protection scope of the present invention.

Based on the specific composition of the above-mentioned charging control device connected in parallel with multiple lithium batteries, the present invention also discloses a charging control method for charging control using the above-mentioned charging control device connected in parallel with multiple lithium batteries, including the following steps: 1) connecting several lithium batteries The charging and discharging harness 8 of the battery pack is connected in parallel in sequence, and then connected to the power supply circuit 13 of the control module 1 through the step-down module 2; The wiring harness 9 is connected in parallel to the charging instruction receiving circuit 12 of the control module 1 in turn; 2) the charger 6 is connected to any charging input interface on the multi-lithium battery pack connected in parallel; 3) the microcontroller 14 in the control module 1 controls the Charge the lithium battery pack with the lowest voltage in some lithium battery packs connected with it; 4) when the voltage after charging the lithium battery pack with the lowest voltage is equal to the voltage of the lithium battery pack with the second lowest voltage, microcontroller 14 controls the lithium battery pack at the same time Two groups of lithium battery packs with the lowest voltage and the second lowest voltage connected to it are charged in parallel; when the charged voltage of the lithium battery pack 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 parallel charging of the three groups of lithium battery packs with the lowest, second lowest and third lowest voltages connected to it at the same time; 5) cycle step 4), until the microcontroller 14 controls the charging of some lithium battery packs charged in parallel at the same time When the voltage is equal to the voltage of the lithium battery pack with the highest voltage, the microcontroller 14 controls all the lithium battery packs connected to it to be charged in parallel at the same time; Lithium battery packs are charged at near-short-circuit currents. When the charger is disconnected from the charging input interface, the microcontroller 14 sends a command to close the charging circuit to the power management system of all lithium battery packs that have opened the charging circuit, and stops charging each lithium battery pack.

The charging control device and charging control method for parallel connection of multiple lithium battery packs disclosed in the present invention only use the control module 1 to communicate with each lithium battery pack, and charge each lithium battery pack in the lithium battery pack in a safe and orderly manner in turn, avoiding the The difference in power of the lithium battery pack causes the high-voltage lithium battery pack to charge the low-voltage lithium battery pack with a current close to the short circuit, which reduces the charging damage of the lithium battery pack, prolongs the service life of the lithium battery pack, and reduces the control and The complexity and development cost of the charging control method improve communication and charging efficiency and improve user convenience.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (10)

1. a kind of battery charge controller of more lithium battery group parallel connections, which is characterized in that including several lithium battery groups, voltage reduction module, Control module and the charger for being connected to lithium battery group；

Using voltage reduction module is connected to after battery set charge/discharge harness successively parallel connection, voltage reduction module connects several lithium battery groups In control module；The control module includes microcontroller, is connected to the power supply circuit of microcontroller, communication transceiving circuit and fills Electric command reception circuit；The voltage reduction module is connected to power supply circuit, steady to control module for several lithium battery groups in parallel Pressure power supply；Several lithium battery groups using battery pack communication harness it is successively in parallel after be connected to communication transceiving circuit, for Microcontroller sends the information of each lithium battery group；Several lithium battery groups using charge request signal harness it is successively in parallel after connect It is connected to charging instruction and receives circuit, send charge request signal to microcontroller for charger；The microcontroller is used for root It is issued according to the information of charge request signal and received each lithium battery group to the power-supply management system of each lithium battery group and opens charging Each lithium battery group charged in parallel is realized in the order in circuit.

2. the battery charge controller of more lithium battery group parallel connections according to claim 1, which is characterized in that the microcontroller It is inside preset with control program, control program is used to receive the charge request of charger sending when microcontroller, receive in conjunction with communication The information for each lithium battery group that Power Generation Road is collected is issued to open to the power-supply management system of the minimum lithium battery group of voltage and be charged back The order on road starts the charge circuit of the lithium battery group, realizes the charging of the lithium battery group；And after lithium battery group charging When voltage is equal with the next to the lowest lithium battery group voltage of voltage, the power-supply management system to the next to the lowest lithium battery group of voltage is controlled The order for opening charge circuit is issued, is realized to two lithium battery groups while charged in parallel；Reciprocal judgement is analogized, until control journey Sequence issues the order for opening charge circuit to the power-supply management system of the highest lithium battery group of voltage, realizes all and control module The lithium battery group while charged in parallel being connected in parallel.

3. the battery charge controller of more lithium battery group parallel connections according to claim 1, which is characterized in that the charger to The charge request signal that microcontroller is sent includes short-circuit signal, break signal, high level signal and low level signal.

4. the battery charge controller of more lithium battery group parallel connections according to claim 3, which is characterized in that the charger packet Include charger body, charger output terminal and charge request line；The charger body is connected to charge power supply, for lithium Battery pack charging；The charger output terminal is connected to any lithium battery group, including for connecting battery set charge/discharge harness Anode and cathode charging jack, it is described anode and cathode charging jack be connected to battery set charge/discharge harness anode and Cathode connection, for being connected to the charging circuit of lithium battery group；The charge request line is connected to charging instruction and receives circuit.

5. the battery charge controller of more lithium battery group parallel connections according to claim 4, which is characterized in that the charge request Line is arranged in output terminal, is the signal terminal of two internal short-circuits, and the signal terminal is plugged in charging instruction and receives electricity Road, for issuing short-circuit signal to control module.

6. the battery charge controller of more lithium battery group parallel connections according to claim 3, which is characterized in that the charger packet Include charger body and charger output terminal；The charger body is connected to charge power supply, for charging to lithium battery group； The charger output terminal is connected to any lithium battery group, including the anode and cathode for connecting battery set charge/discharge harness Charging jack, the anode are connected with cathode with the anode that cathode charging jack is connected to battery set charge/discharge harness, are used In the charging circuit of connection lithium battery group；

Charging input interface, the charging input interface are provided in several lithium battery groups in any one lithium battery group It is internally provided with microswitch, microswitch is connected to charge request signal harness；In normally opened when the microswitch is initial Or normally off, in the charging input interface for any one lithium battery group that charger output terminal is plugged into, charger output Terminal is connected to the switch of microswitch so that microswitch jump to it is initial when opposite normally closed or normally open, be used for Short-circuit signal or break signal are issued to control module.

7. the battery charge controller of more lithium battery group parallel connections according to claim 1, which is characterized in that the communication receiving/transmission The information of the received each lithium battery group of circuit includes information about power, information of voltage, current information and the fault message of lithium battery group.

8. the battery charge controller of more lithium battery group parallel connections according to claim 1, which is characterized in that more lithium batteries Group battery charge controller in parallel further includes the display module for being connected to control module, and display module is for showing current each lithium electricity The information such as electricity, voltage, electric current, charging, electric discharge and the failure of pond group.

9. a kind of charge control method of more lithium battery group parallel connections, which is characterized in that described in any item using claim 1-8 The battery charge controller of more lithium battery group parallel connections carries out charge control, the charge control method packet of more lithium battery group parallel connections It includes:

1) by several lithium battery groups using battery set charge/discharge harness it is successively in parallel after be connected to and be connected to control through voltage reduction module The power supply circuit of module, the communication transceiving circuit for being connected to control module after successively in parallel using battery pack communication harness and Circuit is received using the charging instruction for being connected to control module after charge request signal harness successively parallel connection；

2) it is connected using charging input interface with charger；

3) microcontroller in control module control the lithium battery group minimum to voltage in several lithium battery groups connected to it into Row charging；

4) when the voltage after the minimum lithium battery group charging of voltage is equal with the next to the lowest lithium battery group voltage of voltage, microcontroller Device control while the next to the lowest two groups of lithium battery group charged in parallels of and voltage minimum to voltage connected to it；When voltage it is minimum and When voltage after next to the lowest lithium battery group charging is equal with the lithium battery group voltage that voltage regulation three is low, microcontroller is controlled simultaneously , second low and three group lithium battery group charged in parallels that third low minimum to voltage connected to it；

5) circulation step 4), and so on, until after microcontroller control while several lithium battery groups charging of charged in parallel When voltage is equal with the highest lithium battery group voltage of voltage, microcontroller control simultaneously to all lithium battery groups connected to it into Row charged in parallel.

10. the charge control method of more lithium battery group parallel connections according to claim 9, which is characterized in that when charger with After charging input interface disconnects, microcontroller is issued to the power-supply management system of all lithium battery groups for opening charge circuit and is closed The order of charge circuit.