CN211908409U - Battery system charge-discharge switch circuit and power supply system - Google Patents
Battery system charge-discharge switch circuit and power supply system Download PDFInfo
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- CN211908409U CN211908409U CN202020430064.6U CN202020430064U CN211908409U CN 211908409 U CN211908409 U CN 211908409U CN 202020430064 U CN202020430064 U CN 202020430064U CN 211908409 U CN211908409 U CN 211908409U
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Abstract
The application belongs to the technical field of battery energy storage control, and particularly relates to a battery system charge and discharge switch circuit and a power supply system, wherein the battery system charge and discharge switch circuit is connected with a plurality of energy storage batteries in a one-to-one correspondence manner through a plurality of charge switch circuits; the plurality of discharging switch circuits are connected with the plurality of charging switch circuits in a one-to-one correspondence manner; the voltage conversion circuit is connected with the plurality of discharge switch circuits and performs voltage conversion on the input voltage signal; the charging switch circuits and the discharging switch circuits are used for respectively performing charging control or discharging control on the energy storage batteries, so that independent and flexible charging and discharging control on the energy storage batteries connected in parallel is realized, and unified operation of other energy storage batteries is not required to be waited; the energy storage batteries connected in parallel can be controlled to achieve a balanced effect in the charging and discharging processes; the circuit structure is simple, the consistency of the battery is high, and the electric energy loss of the power supply system is reduced.
Description
Technical Field
The application belongs to the technical field of battery testing and energy storage, and particularly relates to a charging and discharging switch circuit of a battery system and a power supply system.
Background
In the battery test field and the energy storage field, a plurality of batteries connected in parallel are often required to be charged and discharged. For example, in the energy storage project, the energy storage function of the battery is usually utilized, and a measure for adjusting the electric load, also called a peak clipping and valley filling method, is adopted, so that considerable economic benefits are generated. The energy storage system needs to control the battery to be charged or discharged continuously, for example, the battery can be charged by using a power grid when the electricity price is low at night, and the battery can be discharged by using the battery to feed the power grid to other electrical appliances during the peak electricity utilization period in the daytime. However, in the conventional charge-discharge switching control system, a plurality of batteries are connected in parallel for charge and discharge, each battery is provided with a switch, and when the switches are closed, the batteries can be charged or discharged, for example, when a battery system is charged, when one battery is fully charged, the corresponding switch is opened, other batteries are fully charged, and the next time the switches are closed, the unified operation is waited; when the battery system discharges, when one battery discharges, the corresponding switch is disconnected, the other batteries discharge, and the next unified operation of closing the switches is waited; therefore, the traditional charging and discharging switching control mechanism is single in control mode, not flexible enough, and low in battery consistency, so that electric energy loss is large, and even a battery energy storage and power supply system is damaged seriously.
Therefore, when the charging and discharging of the battery system are switched and controlled, the energy storage battery cannot be independently, directly, effectively and flexibly controlled, the consistency of the battery is low, and the electric energy loss is large.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a battery system charge-discharge switch circuit and electrical power generating system, when aiming at solving the charge-discharge that exists the battery system among the traditional technical scheme and switching control, can not carry out independent direct effectual nimble independent control to energy storage battery, the uniformity of battery is low, leads to the problem that electric energy loss is big.
A first aspect of an embodiment of the present application provides a battery system charge and discharge switching circuit, including:
a plurality of energy storage cells;
the charging switch circuits are connected with the energy storage batteries in a one-to-one correspondence manner;
the plurality of discharging switch circuits are connected with the plurality of charging switch circuits in a one-to-one correspondence manner; and
the voltage conversion circuit is connected with the plurality of discharge switch circuits and is used for performing voltage conversion processing on the input voltage signals;
the charging switch circuits and the discharging switch circuits are used for respectively controlling the charging or discharging of the energy storage batteries.
In one embodiment, the battery system charge and discharge switching circuit further includes:
the sampling circuit is connected with the energy storage batteries and is used for sampling the voltages of the energy storage batteries and correspondingly generating voltage sampling signals;
and the control circuit is respectively connected with the sampling circuit, the discharging switch circuit and the charging switch circuit, is used for receiving the voltage sampling signal and generating a switch control signal according to the voltage sampling signal to be sent to the discharging switch circuit and the charging switch circuit so as to control the charging or discharging of the energy storage battery.
In one embodiment, the charging switch circuit comprises a first unidirectional conductive unit with a unidirectional conductive function and a first switch unit with a switch function;
the first end of the first unidirectional conductive unit and the first end of the first switch unit are connected to the corresponding energy storage battery in a sharing mode, the second end of the first unidirectional conductive unit and the second end of the first switch unit are connected to the corresponding discharge switch circuit in a sharing mode, and the third end of the first switch unit is connected with the control circuit.
In one embodiment, the first switching unit includes a first relay; the first end of the relay switch of the first relay is connected with the energy storage battery, the second end of the relay switch of the first relay is connected with the discharge switch circuit, and the relay coil of the first relay is connected with the control circuit.
In one embodiment, the charge switch circuit includes: a first diode and a first switch tube;
the anode of the first diode and the first end of the first switch tube are connected to the energy storage battery in common, the cathode of the first diode and the second end of the first switch tube are connected to the discharge switch circuit in common, and the third end of the first switch tube is connected to the control circuit.
In one embodiment, the first switch tube is an NPN triode or an N-type MOS tube.
In one embodiment, the discharge switch circuit includes a second unidirectional conductive unit having a unidirectional conductive function and a second switch unit having a switching function;
the first end of the second unidirectional conductive unit and the first end of the second switch unit are connected to the corresponding charging switch circuit in a shared mode, the second end of the second unidirectional conductive unit and the second end of the second switch unit are connected to the corresponding voltage conversion circuit in a shared mode, and the third end of the second switch unit is connected with the control circuit.
In one embodiment, the second switching unit includes a second relay; the first end of the relay switch of the second relay is connected with the charging circuit, the second end of the relay switch of the second relay is connected with the voltage conversion circuit, and the relay coil of the second relay is connected with the control circuit.
In one embodiment, the discharge switching circuit includes: a second diode and a second switching tube;
the cathode of the second diode and the first end of the second switch tube are connected to the charging switch circuit, the anode of the second diode and the second end of the second switch tube are connected to the voltage conversion circuit, and the third end of the second switch tube is connected to the control circuit.
A second aspect of embodiments of the present application provides a power supply system comprising a battery system charge and discharge switching circuit as described in any one of the above.
The embodiment of the utility model provides a be connected through a plurality of charging switch circuit and a plurality of energy storage battery one-to-one, a plurality of discharging switch circuit are connected with a plurality of charging switch circuit one-to-one, voltage conversion circuit is connected with a plurality of discharging switch circuit to voltage conversion is carried out to the voltage signal of input, wherein a plurality of charging switch circuit and discharging switch circuit are used for carrying out charge control or discharge control to a plurality of energy storage battery respectively, realize carrying out independent nimble charge control or discharge control to every energy storage battery, need not to wait for other energy storage batteries to carry out unified charge-discharge operation; the energy storage batteries connected in parallel can be controlled to achieve a balanced effect in the charging and discharging processes; the circuit structure is simple, the consistency of the energy storage battery is high, and the electric energy loss of the power supply system is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a charge and discharge switch circuit of a battery system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a charge/discharge switch circuit of a battery system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a charge/discharge switch circuit of a battery system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a charge/discharge switch circuit of a battery system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a charge/discharge switch circuit of a battery system according to an embodiment of the present disclosure;
fig. 6 is an exemplary circuit schematic diagram of a charge switch circuit and a discharge switch circuit in a charge/discharge switch circuit of a battery system according to an embodiment of the present disclosure;
fig. 7 is a schematic circuit diagram illustrating an example of a control circuit in a charge/discharge switching circuit of a battery system according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic structural diagram of a charge and discharge switch circuit of a battery system according to a first embodiment of the present application, and for convenience of description, only the portions related to this embodiment are shown, and detailed descriptions are as follows:
a battery system charge and discharge switching circuit comprising: a plurality of energy storage batteries 100, a plurality of charging switch circuits 01, a plurality of discharging switch circuits 02, and a voltage conversion circuit 11.
A plurality of energy storage cells 100; the charging switch circuits 01 are connected with the energy storage batteries 100 in a one-to-one correspondence manner; a plurality of discharge switch circuits 02 connected to the plurality of charge switch circuits 01 in a one-to-one correspondence; and a voltage conversion circuit 11 connected to the plurality of discharge switch circuits 02, for performing voltage conversion processing on an input voltage signal; the charging switch circuits 01 and the discharging switch circuits 02 are used for respectively performing charging control or discharging control on the energy storage batteries.
In the present embodiment, a plurality of energy storage batteries 100 (represented by N, N is a positive integer greater than or equal to 1) are connected in parallel, and each energy storage battery 100 is connected in series with a charging switch circuit 01 and a discharging switch circuit 02, and a charging and discharging path is formed by the charging switch circuit 01 and the discharging switch circuit 02 to perform charging control and discharging control on the corresponding energy storage battery 100. In a specific implementation, the switching control signal may be generated according to a user operation or a power system controller according to a charging/discharging requirement of each energy storage battery 100, so as to control the working state of the charging switching circuit 01 and the discharging switching circuit 02 connected in series with the energy storage battery 100. For example, when the external power supply charges the energy storage battery 100, the charging switch circuit 01 is operated, the discharging switch circuit 02 is not operated, and at this time, the charging current can only be output from the voltage conversion circuit 11 to the energy storage battery 100 to charge the energy storage battery 100, and the discharging switch circuit 02 can be regarded as a wire when not operated; when the energy storage battery 100 discharges, the discharging switch circuit 02 works, the charging switch circuit 01 does not work, and discharging current can only flow from the energy storage battery 100 to the voltage conversion circuit 11 at the moment, so that the energy storage battery 100 is discharged, and the charging switch circuit 01 can be regarded as a conducting wire when not working. One or more of the energy storage batteries 100 connected in parallel can be controlled to be charged and discharged simultaneously, so that the aim of controlling the energy storage batteries connected in parallel to achieve balance in the charging and discharging process is fulfilled.
In this embodiment, the voltage converting circuit 11 may be a dc voltage converting circuit or an ac voltage converting circuit. The voltage conversion circuit 11 performs voltage conversion processing on the input voltage signal, including performing voltage conversion processing on an externally input ac voltage signal, and performing voltage conversion processing on a plurality of dc voltage signals input by the energy storage batteries 100, for example, if the battery system charging and discharging switch circuit in this embodiment is connected to the utility power grid, the voltage conversion circuit 11 converts the dc voltage signal output by the energy storage battery 100 into an ac power when the energy storage battery 100 is discharged and transmits the ac power to the utility power grid, and converts the ac power provided by the utility power grid into a dc voltage signal when the utility power grid charges the energy storage battery 100, so as to charge the energy storage battery 100.
According to the embodiment, independent and flexible charging control or discharging control can be performed on each energy storage battery, and unified charging and discharging operations of other energy storage batteries are not required to be waited; the energy storage batteries connected in parallel can be controlled to achieve a balanced effect in the charging and discharging processes; the circuit structure is simple, the consistency of the energy storage battery is high, and the electric energy loss of the power supply system is reduced.
Referring to fig. 2, in one embodiment, the charge/discharge switching circuit of the battery system further includes: a sampling circuit 12 and a control circuit 13.
The sampling circuit 12 is connected with the plurality of energy storage batteries, and is used for sampling voltages of the plurality of energy storage batteries and correspondingly generating voltage sampling signals; and the control circuit 13 is respectively connected with the sampling circuit 12, the plurality of discharge switch circuits 02 and the plurality of charge switch circuits 01, and is configured to receive the voltage sampling signal, generate a switch control signal according to the voltage sampling signal, and send the switch control signal to the discharge switch circuit 02 and the charge switch circuit 01, so as to perform charge control or discharge control on the energy storage battery.
In the present embodiment, a plurality of energy storage batteries 100 connected in parallel constitute a battery pack in the battery system. Optionally, the sampling circuit 11 includes a plurality of sampling resistors and a sampling processing chip, where the sampling processing chip may adopt an analog front-end chip with a model bq76940, and may detect and process electrical parameters (for example, voltages or currents of batteries) of the plurality of energy storage batteries 100 to generate a voltage sampling signal, and output the voltage sampling signal to the control circuit 13 in a serial communication manner or a bus communication manner, where the voltage sampling signal includes voltage and current information of the plurality of energy storage batteries 100. The switch control signal comprises a charging switch control signal and a discharging switch control signal, the control circuit 13 compares a voltage value in the voltage sampling signal with a preset voltage threshold, and generates a first switch control signal (comprising a first charging switch control signal and a first discharging switch control signal) when the voltage value of the energy storage battery 100 in the voltage sampling signal is smaller than the preset threshold, so as to control the charging switch circuit 01 and the discharging switch circuit 02 to communicate with a charging current generated by the voltage conversion circuit 11, so as to charge the energy storage battery 100, and the voltage conversion circuit 11 can perform voltage conversion processing on an alternating current voltage input from the outside (such as a power grid) to generate the charging current; when the voltage value of the energy storage battery 100 in the voltage sampling signal is greater than or equal to the preset threshold value, a second switch control signal (including a second charge switch control signal and a second discharge switch control signal) is generated to control the charge switch circuit 01 and the discharge switch circuit 02 to communicate the battery voltage signal output by the energy storage battery 100 to the voltage conversion circuit 11, and the voltage conversion circuit 11 performs voltage conversion on the battery voltage signals output by the energy storage batteries 100 to generate a power supply voltage signal, so as to supply power to external electric equipment.
According to the embodiment of the application, independent and flexible charging and discharging control over the energy storage battery can be realized, and unified operation of other energy storage batteries is not required to be waited; the energy storage batteries connected in parallel can be controlled, and the balance effect is achieved in the charging and discharging process; the circuit structure is simple, the consistency of the battery is high, and the electric energy loss of the power supply system is reduced.
Referring to fig. 3, in one embodiment, the control circuit 12 is further configured to generate a power indication signal according to the voltage sampling signal; the battery system charge-discharge switching circuit further includes: indicating circuit 14.
And an indication circuit 14 connected to the control circuit 13 and configured to indicate the power levels of the plurality of energy storage batteries 100 according to the power level indication signal.
In this embodiment, the indicating circuit 14 is a light-emitting LED or a display, and the control circuit 13 controls the light-emitting LED or the display to indicate the electric quantity of the plurality of energy storage batteries 100 (i.e., the battery pack), so as to indicate the full-charged state of the batteries and the state of low electric quantity that needs to be charged, and the like, so that a user can know the electric quantity condition of the battery pack in the power supply system in time, and take corresponding safety management measures in time.
Referring to fig. 4, in one embodiment, the charging switch circuit 01 includes a first unidirectional conductive unit 101 having a unidirectional conductive function and a first switch unit 102 having a switching function; the first end of the first unidirectional conductive unit 101 and the first end of the first switch unit 102 are connected to the corresponding energy storage battery 100, the second end of the first unidirectional conductive unit 101 and the second end of the first switch unit 102 are connected to the corresponding discharge switch circuit 02, and the third end of the first switch unit 102 is connected to the control circuit 13.
In this embodiment, the first end of the first unidirectional conductive unit 101 is a battery voltage signal input end, and the second end of the first unidirectional conductive unit 101 can be understood as a battery voltage signal output end (ignoring a small voltage drop of the first unidirectional conductive unit 101 itself), because the first switch unit 102 is connected in parallel with the first unidirectional conductive unit 101, when the first switch unit 102 is turned on, the first unidirectional conductive unit 101 is short-circuited, and at this time, the charging switch circuit 01 operates; when the first switch unit 102 is turned off, the charging switch circuit 01 does not operate, and due to the unidirectional conductive characteristic of the first unidirectional conductive unit 101, the first unidirectional conductive unit 101 is turned on, and the battery voltage signal can only be output from the energy storage battery 100 to the voltage conversion circuit 11, that is, the discharging current corresponding to the battery voltage signal can only flow from the energy storage battery 100 to the voltage conversion circuit 11, so that the purpose of controlling the discharging of the energy storage battery 100 is achieved.
Specifically, the first unidirectional conductive unit 101 is capable of turning on a battery voltage signal output by the energy storage battery 100 to the discharge switch circuit 02 and turning off a charging current to the energy storage battery 100. The first switching unit 102 can be turned on or off according to the charging switch control signal.
Referring to fig. 5, in one embodiment, the discharge switch circuit 02 includes a second unidirectional conductive unit 201 having a unidirectional conductive function and a second switch unit 202 having a switching function; the first end of the second unidirectional conducting unit 201 and the first end of the second switching unit 202 are connected to the corresponding charging switching circuit 01, the second end of the second unidirectional conducting unit 201 and the second end of the second switching unit 202 are connected to the corresponding voltage converting circuit 11, and the third end of the second switching unit 202 is connected to the control circuit 13.
In this embodiment, the first end of the second unidirectional conducting unit 201 is a charging current output end, and the second end of the first unidirectional conducting unit 101 is a charging current input end, because the second switching unit 202 is connected in parallel with the second unidirectional conducting unit 201, when the second switching unit 202 is turned on, the second unidirectional conducting unit 201 is short-circuited, and at this time, the discharging switching circuit 02 operates; when the first switch unit 102 is turned off, the discharge switch circuit 02 does not operate, and due to the unidirectional conductive property of the second unidirectional conductive unit 201, the second unidirectional conductive unit 201 is turned on, and the charging current can only flow from the voltage conversion circuit 11 to the energy storage battery 100, so that the purpose of charging the energy storage battery 100 is achieved.
Specifically, the second unidirectional conductive unit 201 is capable of conducting the charging current output by the voltage conversion circuit 11 to the charging switch circuit 01, and turning off the battery voltage signal output by the energy storage battery 100. The second switching unit 202 can be turned on or off according to the discharge switch control signal.
In specific implementation, the first unidirectional conducting unit 101, the first switch unit 102, the second unidirectional conducting unit 201, and the second switch unit 202 can implement charging control and discharging control on the energy storage battery 100, for example, when the control circuit 13 determines that the energy storage battery 100 needs to be charged according to the voltage sampling signal, the control circuit 13 generates a charging switch control signal of a first level according to the voltage sampling signal to control the first switch unit 102 to be turned on, and generates a discharging control signal of a second level to control the second switch unit 202 to be turned off, so that the second unidirectional conducting unit 201 and the first switch unit 102 communicate the charging current output by the voltage conversion circuit 11 to charge the energy storage battery 100 connected correspondingly; when the control circuit 13 determines that the energy storage battery 100 needs to discharge according to the voltage sampling signal, the control circuit 13 generates a charging switch control signal of a second level according to the voltage sampling signal to control the first switch unit 102 to turn off, generates a discharging switch control signal of a first level to control the second switch unit 202 to turn on, so that the battery voltage signal output by the energy storage battery 100 is communicated to the voltage conversion circuit 11 through the first unidirectional conductive unit 101 and the second switch unit 202, and performs voltage conversion on the battery voltage signals output by the plurality of energy storage batteries 100 through the voltage conversion circuit 11 to generate a power supply voltage, thereby supplying power to external electric equipment. Optionally, the first level is a high level, and the second level is a low level.
In one embodiment, the first switching unit 102 includes a first relay; the first end of the relay switch of the first relay is connected with the energy storage battery 100, the second end of the relay switch of the first relay is connected with the discharge switch circuit 02, and the relay coil of the first relay is connected with the control circuit 13.
In this embodiment, a first terminal of the relay switch of the first relay is connected to a first terminal of the first unidirectional conductive unit 101, and a second terminal of the relay switch of the first relay is connected to a second terminal of the first unidirectional conductive unit 101.
In one embodiment, the second switching unit 202 includes a second relay; the first end of the relay switch of the second relay is connected with the charging circuit 01, the second end of the relay switch of the second relay is connected with the voltage conversion circuit 11, and the relay coil of the second relay is connected with the control circuit 13.
In this embodiment, a first terminal of the relay switch of the second relay is connected to a first terminal of the second unidirectional conductive unit 201, and a second terminal of the relay switch of the second relay is connected to a second terminal of the second unidirectional conductive unit 201.
In specific implementation, optionally, a first end of a relay switch of the first relay is connected to the energy storage battery 100, a second end of the relay switch of the first relay is connected to a first end of a relay switch of the second relay, a second end of the relay switch of the second relay is connected to the voltage conversion circuit 11, and a relay coil of the first relay and a relay coil of the second relay are connected to the control circuit 13 in common. The control circuit 13 generates a charging switch control signal and a discharging switch control signal according to the voltage sampling signal or according to user input, and the coil of the first relay is powered on or not powered on according to the charging switch control signal, so that the relay switch of the first relay is switched on or off; the coil of the second relay is powered or not powered according to the discharge switch control signal, so that the relay switch of the second relay is turned on or off, and then the energy storage battery 100 is independently controlled to be charged or discharged by combining the first one-way conductive unit 101 and the second one-way conductive unit 201.
Referring to fig. 6, in one embodiment, the charge switch circuit 01 includes: a first diode D1 and a first switch tube K1; the anode of the first diode D1 and the first terminal 1 of the first switch tube K1 are connected to the energy storage battery 100 in common, the cathode of the first diode D1 and the second terminal 2 of the first switch tube K1 are connected to the discharge switch circuit 02 in common, and the third terminal 3 of the first switch tube K1 is connected to the control circuit 13.
In this embodiment, the first diode D1 is a unidirectional conducting device, and can conduct the battery voltage signal output by the corresponding energy storage battery 100 to the discharge switch circuit 02, and cut off the charging current output by the voltage conversion circuit 11.
In specific implementation, optionally, the first switch transistor K1 is an NPN transistor or an N-type MOS transistor, and can be turned on or off according to the non-level charge switch control signal. In one embodiment, the first switch transistor K1 may also be a PNP transistor or a P-type MOS transistor.
Referring to fig. 4, in one embodiment, the discharge switch circuit 02 includes: a second diode D2 and a second switching tube K2; the cathode of the second diode D2 and the first end 1 of the second switch tube K2 are commonly connected to the charging switch circuit 01, the anode of the second diode D2 and the second end 2 of the second switch tube K2 are commonly connected to the voltage conversion circuit 11, and the third end 3 of the second switch tube K2 is connected to the control circuit 13.
In this embodiment, the second diode D2 is a unidirectional conducting element, and can conduct the charging current output by the voltage conversion circuit 11 to the charging switch circuit 01, and cut off the battery voltage signal output by the corresponding energy storage battery 100.
In specific implementation, optionally, the second switch tube K2 is an NPN transistor or an N-type MOS transistor, and can be turned on or off according to the discharge switch control signal with a low level. In one embodiment, the second switch transistor K2 may also be a PNP transistor or a P-type MOS transistor. The switch tube and the one-way conductive element are easy to obtain, a large number of expensive components are avoided, and the cost is saved.
Referring to fig. 7, in one embodiment, the control circuit 13 includes: a microprocessor U1 and a first capacitor C1; the power supply end VDD of the microprocessor U1 and the first end of the first capacitor C1 are connected to a first dc power supply end, the first end of the first capacitor C1 is connected to a power ground, the analog ground terminal VSS of the microprocessor U1 is connected to the power ground, the first data input/output end PF6 of the microprocessor U1 and the second data input/output end PF7 of the microprocessor U1 are connected to the sampling circuit 12, the third data input/output end PF3 of the microprocessor U1 is connected to the indication circuit 14, the data input/output ends (PC1 to PCN) of the microprocessor U1 are connected to the charging switch circuits 01 in a one-to-one correspondence, and the data input/output ends (PB1 to PBN) of the microprocessor U1 are connected to the discharging switch circuits 02 in a one-to-one correspondence.
In this embodiment, the first dc power supply end outputs a first dc power, and the voltage of the first dc power is VDD. Optionally, the microprocessor U1 adopts a single chip microcomputer of the model STM32 series, and can generate a switch control signal according to a voltage sampling signal input by the sampling circuit 12 to perform charging control or discharging control on the energy storage battery 100. In one embodiment, the microprocessor U1 may further adopt a microcontroller of type PIC18F66K22, which performs analysis, comparison, calculation, and the like on the voltage sampling signal generated by the sampling circuit 12 to generate a switch control signal (including a charging switch control signal and a discharging switch control signal), so as to implement charging and discharging control and equalization adjustment on the plurality of energy storage cells 100.
The working principle of the charge and discharge switch circuit of the battery system will be briefly described with reference to fig. 6 and 7 as follows:
the sampling circuit 12 is connected to the plurality of energy storage batteries 100, and performs voltage sampling on the voltages of the plurality of energy storage batteries 100, to generate a voltage sampling signal, the microprocessor U1 generates a charge switch control signal and a discharge control signal and a charge amount display signal according to the voltage sampling signal, to control charging of the energy storage battery 100 or to control discharging of the energy storage battery 100, and controlling the light-emitting LED to indicate the state of charge of the battery pack, for example, when the microprocessor U1 determines that the energy storage battery 100 needs to be charged according to the voltage sampling signal, the microprocessor U1 generates a charging switch control signal with a first level according to the voltage sampling signal to control the first switch tube K1 to be turned on, generates a discharging switch control signal with a second level to control the second switch tube K2 to be turned off, thereby connecting the charging current output by the voltage conversion circuit 11 through the second diode D2 and the first switch tube K1 to charge the energy storage battery 100; when the microprocessor U1 determines that the energy storage battery 100 needs to discharge according to the voltage sampling signal, the microprocessor U1 generates a charging switch control signal of a second level according to the voltage sampling signal to control the first switch tube K1 to be turned off, and generates a discharging switch control signal of a first level to control the second switch tube K2 to be turned on, so that the battery voltage signal output by the energy storage battery 100 is communicated to the voltage conversion circuit 11 through the first diode D1 and the second switch tube K2, and the voltage conversion circuit 11 performs voltage conversion on the plurality of battery voltage signals to generate a power supply voltage, so as to supply power to the electric devices.
A second aspect of embodiments of the present application provides a power supply system including a battery system charge and discharge switching circuit as described in any one of the above.
The embodiment of the utility model provides a can realize carrying out independent nimble charge-discharge control to a plurality of energy storage batteries that connect in parallel, need not to wait for other energy storage batteries to carry out unified operation; the energy storage batteries connected in parallel can be controlled to achieve a balanced effect in the charging and discharging processes; the circuit structure is simple, expensive and a large number of components are avoided, the cost is saved, the battery consistency is high, and the electric energy loss of a power supply system is reduced.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A battery system charge-discharge switching circuit, comprising:
a plurality of energy storage cells;
the charging switch circuits are connected with the energy storage batteries in a one-to-one correspondence manner;
the plurality of discharging switch circuits are connected with the plurality of charging switch circuits in a one-to-one correspondence manner; and
the voltage conversion circuit is connected with the plurality of discharge switch circuits and is used for performing voltage conversion processing on the input voltage signals;
the charging switch circuits and the discharging switch circuits are used for respectively controlling the charging or discharging of the energy storage batteries.
2. The battery system charge and discharge switching circuit of claim 1, further comprising:
the sampling circuit is connected with the energy storage batteries and is used for sampling the voltages of the energy storage batteries and correspondingly generating voltage sampling signals;
and the control circuit is respectively connected with the sampling circuit, the discharging switch circuit and the charging switch circuit, is used for receiving the voltage sampling signal and generating a switch control signal according to the voltage sampling signal to be sent to the discharging switch circuit and the charging switch circuit so as to control the charging or discharging of the energy storage battery.
3. The battery system charge and discharge switching circuit according to claim 2, wherein the charge switching circuit comprises a first unidirectional conductive element having a unidirectional conductive function and a first switching element having a switching function;
the first end of the first unidirectional conductive unit and the first end of the first switch unit are connected to the corresponding energy storage battery in a sharing mode, the second end of the first unidirectional conductive unit and the second end of the first switch unit are connected to the corresponding discharge switch circuit in a sharing mode, and the third end of the first switch unit is connected with the control circuit.
4. The battery system charge and discharge switching circuit of claim 3, wherein the first switching unit comprises a first relay; the first end of the relay switch of the first relay is connected with the energy storage battery, the second end of the relay switch of the first relay is connected with the discharge switch circuit, and the relay coil of the first relay is connected with the control circuit.
5. The battery system charge-discharge switching circuit of claim 2, wherein the charge switching circuit comprises: a first diode and a first switch tube;
the anode of the first diode and the first end of the first switch tube are connected to the energy storage battery in common, the cathode of the first diode and the second end of the first switch tube are connected to the discharge switch circuit in common, and the third end of the first switch tube is connected to the control circuit.
6. The battery system charge-discharge switching circuit according to claim 5, wherein the first switching transistor is an NPN transistor or an N-type MOS transistor.
7. The battery system charge and discharge switching circuit according to claim 2, wherein the discharge switching circuit comprises a second unidirectional conductive unit having a unidirectional conductive function and a second switching unit having a switching function;
the first end of the second unidirectional conductive unit and the first end of the second switch unit are connected to the corresponding charging switch circuit in a shared mode, the second end of the second unidirectional conductive unit and the second end of the second switch unit are connected to the corresponding voltage conversion circuit in a shared mode, and the third end of the second switch unit is connected with the control circuit.
8. The battery system charge and discharge switching circuit of claim 7 wherein the second switching unit comprises a second relay; the first end of the relay switch of the second relay is connected with the charging switch circuit, the second end of the relay switch of the second relay is connected with the voltage conversion circuit, and the relay coil of the second relay is connected with the control circuit.
9. The battery system charge and discharge switching circuit of claim 2, wherein the discharge switching circuit comprises: a second diode and a second switching tube;
the cathode of the second diode and the first end of the second switch tube are connected to the charging switch circuit, the anode of the second diode and the second end of the second switch tube are connected to the voltage conversion circuit, and the third end of the second switch tube is connected to the control circuit.
10. A power supply system comprising the battery system charge and discharge switching circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020430064.6U CN211908409U (en) | 2020-03-27 | 2020-03-27 | Battery system charge-discharge switch circuit and power supply system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020430064.6U CN211908409U (en) | 2020-03-27 | 2020-03-27 | Battery system charge-discharge switch circuit and power supply system |
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| CN211908409U true CN211908409U (en) | 2020-11-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994191A (en) * | 2021-04-30 | 2021-06-18 | 深圳市永联科技股份有限公司 | Current control unit, power supply unit and vehicle |
| CN114336863A (en) * | 2021-12-31 | 2022-04-12 | 傲普(上海)新能源有限公司 | Single capacitance and inductance solution circuit for short-plate battery of battery module |
-
2020
- 2020-03-27 CN CN202020430064.6U patent/CN211908409U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994191A (en) * | 2021-04-30 | 2021-06-18 | 深圳市永联科技股份有限公司 | Current control unit, power supply unit and vehicle |
| CN112994191B (en) * | 2021-04-30 | 2021-09-24 | 深圳市永联科技股份有限公司 | Current control unit, power supply unit and vehicle |
| CN114336863A (en) * | 2021-12-31 | 2022-04-12 | 傲普(上海)新能源有限公司 | Single capacitance and inductance solution circuit for short-plate battery of battery module |
| CN114336863B (en) * | 2021-12-31 | 2023-10-24 | 傲普(上海)新能源有限公司 | Capacitive inductance solving circuit of battery module short-plate battery monomer |
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