CN214798907U - Long standby electrochemical device, energy storage system and electric vehicle - Google Patents
Long standby electrochemical device, energy storage system and electric vehicle Download PDFInfo
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- CN214798907U CN214798907U CN202023207812.3U CN202023207812U CN214798907U CN 214798907 U CN214798907 U CN 214798907U CN 202023207812 U CN202023207812 U CN 202023207812U CN 214798907 U CN214798907 U CN 214798907U
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model relates to an electrochemical device, energy storage system and electric motor car of long standby. The application provides an electrochemical device, the electrochemical device comprises a battery management system, a battery unit and a switch unit, wherein the switch unit is electrically connected between the battery management system and the battery unit; the battery management system is used for acquiring the state of charge of the battery unit, and when the state of charge is smaller than a preset threshold value and the electrochemical device does not acquire the charging current transmitted by external charging equipment, the battery management system outputs a first signal to the switch unit, and the switch unit disconnects the electrical connection between the battery unit and the battery management system according to the first signal. The application also provides an energy storage system. According to the electrochemical device with long standby time, the energy storage system and the electric vehicle, the electrochemical device can be kept for a long storage time when the charge state is low and the external part cannot be charged in time.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an electrochemical device with long standby time, an energy storage system and an electric vehicle.
Background
In order to meet the demand for electric energy in various fields, a battery system may be provided. And charging the battery system under the condition of abundant electric energy. In the case of a power shortage, the battery system is used for supplying power. The conventional battery system is designed to maintain a long storage time even when the state of charge (SOC) is low and the external device cannot be charged in time. In the control strategy, when the Battery System reaches a low SOC value, the Battery Management System (BMS) enters a sleep mode to reduce the power consumption of the Battery System. When the Power is connected, the energy storage converter System (PCS) can perform signal activation on the battery System, and then perform charging. However, even if the Battery Management System (BMS) enters the sleep mode at the time of a low SOC value and when external charging cannot be performed in time, a long storage time cannot be maintained.
SUMMERY OF THE UTILITY MODEL
Accordingly, there is a need for a long standby electrochemical device, an energy storage system and an electric vehicle, which can control the charging of a battery management system to maintain a long storage time.
One embodiment of the present application provides a long standby electrochemical device, including a battery unit, a battery management system, and a switch unit;
the switch unit is electrically connected between the battery management system and the battery unit;
the battery management system is used for acquiring the state of charge of the battery unit, and when the state of charge is smaller than a preset threshold value and the electrochemical device does not acquire the charging current transmitted by external charging equipment, the battery management system outputs a first signal to the switch unit, and the switch unit disconnects the electrical connection between the battery unit and the battery management system according to the first signal.
In one possible implementation manner, when the state of charge is smaller than a preset threshold and the electrochemical device obtains a charging current transmitted by an external charging device, the battery management system outputs a second signal to the switch unit, and the switch unit switches on the electrical connection between the battery unit and the battery management system according to the second signal.
In one possible implementation manner, the system further comprises a first power management unit and a first control unit;
the first power management unit is electrically connected between the first control unit and an external charging device and used for converting a first voltage output by the external charging device into a second voltage to supply power to the first control unit, and the first control unit controls the switch unit to conduct the electrical connection between the battery unit and the battery management system according to the second signal.
In one possible implementation manner, the power supply further comprises a first diode;
the anode of the first diode is electrically connected with an external charging device, and the cathode of the first diode is electrically connected with the battery management system;
when the state of charge is smaller than a preset threshold value and the electrochemical device acquires the charging current transmitted by the external charging equipment, the electric energy provided by the external charging equipment is input into the battery management system through the first diode.
In one possible implementation manner, the system further comprises a second power management unit and a second control unit;
the first end of the second power management unit is electrically connected with the battery unit, the second end of the second power management unit is electrically connected with the switch unit and the first diode, and the third end of the second power management unit is electrically connected with the second control unit;
when the state of charge is smaller than a preset threshold value and the electrochemical device does not acquire the charging current transmitted by external charging equipment, the second control unit controls the first control unit to control and output the first signal.
In one possible implementation manner, the system further comprises a third power management unit;
the third power management unit is electrically connected between the first power management unit and an external charging device, and is configured to convert a third voltage output by the external charging device into a first voltage, and transmit the converted first voltage to the first power management unit.
In one possible implementation manner, the device further comprises a second diode and a third diode;
the anode of the second diode is electrically connected with the third power management unit, the cathode of the second diode is electrically connected with the cathodes of the first power management unit and the third diode, and the anode of the third diode is electrically connected with the second power management unit;
when the electrochemical device obtains the charging current transmitted by the external charging equipment, the external charging equipment supplies power to the control unit through the second diode and the third diode.
In one possible implementation manner, the switch unit includes a switch tube, and a first end, a second end, and a third end of the switch tube are electrically connected to the battery unit, the second power supply unit, and the first control unit, respectively.
The application also provides an energy storage system, including as above electrochemical device with the energy storage inverter system that the electrochemical device electricity is connected, energy storage inverter system is used for transmitting after converting the electric energy of outside battery charging outfit electrochemical device, perhaps, will transmit after converting the electric energy of electrochemical device for the load.
The application also provides an electric vehicle which comprises the electrochemical device.
According to the electrochemical device, the energy storage system and the electric vehicle with long standby time, the switch unit is arranged, and when the state of charge of the battery unit is lower than a preset threshold value, the battery unit is disconnected and the battery management system is charged. Therefore, the electrochemical device with long standby time, the energy storage system and the electric vehicle provided by the embodiment of the application can maintain longer storage time when the electrochemical device is in a low state of charge and cannot be charged in time from the outside.
Drawings
Fig. 1 is a block diagram of a preferred embodiment of an electrochemical device according to the present application.
Fig. 2 is a block diagram of another embodiment of an electrochemical device according to the present application.
Fig. 3 is a block diagram of another embodiment of an electrochemical device according to the present application.
Fig. 4 is a circuit diagram of another embodiment of an electrochemical device according to the present application.
Description of the main elements
Switch unit 30
Energy storage inverter system 40
First power management unit 70
Second power management unit 80
Third power management unit 90
First inverter 42
First diode D1
Second diode D2
Third diode D3
Fourth diode D4
Battery B1-BN
Switch K
Fuse F
First transformer T1
Second transformer T2
Third transformer T3
Capacitor C
First electrical connection unit NCA1-NCAN
Analog front end AFE1-AFEN
Bus isolation Unit ISO1-ISON
Optical coupling isolation unit PC1-PCN
Control chip UC1-UCN
Second electrical connection unit NCB1-NCBN
First master control chip U1
Third electrical connection unit 221
Control chip U2
Switching tube Q1-Q2
Third master control chip U3
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.
Referring to fig. 1, fig. 1 is a block diagram of an energy storage system 1 according to a preferred embodiment of the present application. The energy storage system 1 comprises an electrochemical device 100 in long standby and an energy storage inverter system 40, the electrochemical device 100 can be electrically connected with the energy storage inverter system 40, and the electrochemical device 100 comprises a battery unit 10, a battery management system 20 and a switch unit 30.
In the embodiment of the present application, the battery unit 10 is configured to convert chemical energy of the battery unit 10 into electrical energy, and the battery unit 10 may include a plurality of battery cells having positive and negative electrodes. The battery cell 10 may perform a discharging operation in which, when an external circuit electrically connecting the battery cell 10 is disconnected, there is a potential difference (open circuit voltage) between both poles of the battery cell 10, but no current flows, and chemical energy stored in the battery cell 10 is not converted into electrical energy. When the external circuit electrically connected to the battery cell 10 is closed, a current flows through the external circuit due to the potential difference between the two poles of the battery cell 10, so that the battery cell 10 is discharged.
In the present embodiment, the battery unit 10 is electrically connected to the battery management system 20 through the switch unit 30, and when the battery unit 10 performs a discharging operation, the battery unit 10 outputs electric energy to the battery management system 20, so as to maintain the operation of the battery management system 20. The battery unit 10 is electrically connected to the energy storage inverter system 40, the energy storage inverter system 40 is electrically connected to a load (not shown), and the battery unit 10 transmits electric energy to the load (not shown) through the energy storage inverter system 40.
In the present embodiment, the direction of the mass transfer process of the charge inside the battery is opposite to that of the discharge when the battery unit 10 is charged. Specifically, the energy storage inverter system 40 is electrically connected to an external charging device 50, and the energy storage inverter system 40 transmits electric energy of the external charging device 50 to the battery unit 10, so that the external charging device 50 charges the battery unit 10.
In the embodiment of the present disclosure, the battery management system 20 is electrically connected to the battery unit 10, and may be configured to measure a terminal voltage of the battery unit 10, charge the single batteries in an equalizing manner, so that each battery in the battery unit 10 reaches an equalized state, measure a total voltage of the battery unit 10, measure a total current and a charge state of the battery unit 10, and dynamically monitor an operating state of the battery unit 10, during a charging and discharging process of the battery, collect the terminal voltage and temperature of each battery in the battery unit 10, a charging and discharging current, and a total voltage of the battery unit 10 in real time, prevent the battery from being overcharged or overdischarged, display real-time data, record and analyze data, and the like. The battery management system 20 outputs a signal according to the detected state of charge of the battery cell 10.
Specifically, when the state of charge is smaller than a preset threshold, the battery management system 20 outputs a first signal to the switch unit 30, and the switch unit 30 disconnects the electrical connection between the battery unit 10 and the battery management system 20 according to the first signal. When the state of charge is greater than or equal to the preset threshold, the battery management system 20 outputs a second signal to the switch unit 30, and the switch unit 30 switches on the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal.
It can be understood that the state of charge is the ratio of the remaining capacity of the battery to the rated capacity under the same conditions at a certain discharge rate. The preset threshold is a threshold preset by a user, and may be 20%, which is not specifically limited in this application.
In the embodiment of the present application, the switch unit 30 is electrically connected between the battery management system 20 and the battery unit 10, and the switch unit 30 receives a signal from the battery management system 20 to break or make the electrical connection between the battery management system 20 and the battery unit 10 according to the signal. When the electrical connection between the battery management system 20 and the battery unit 10 is disconnected, the power supply of the battery unit 10 to the battery management system 20 is disconnected. When the electrical connection between the battery management system 20 and the battery cell 10 is turned on, the battery cell 10 supplies power to the battery management system 20. Therefore, when the state of charge of the battery unit 10 is lower than a preset threshold, the battery management system 20 avoids power consumption of the battery unit 10.
Specifically, when the state of charge of the battery unit 10 is low and the external cannot charge the battery unit 10 in time, even if the battery management system 20 enters the sleep mode, the battery management system 20 still needs to consume power in the sleep mode, so that the storage time of the electrochemical device 100 still cannot meet the requirement. For this reason, the present application provides an electrochemical device 100, where a switch unit 30 is provided, the switch unit 30 turns on or off an electrical connection between the battery unit 10 and the battery management system 20 according to a signal output by the battery management system 20, when the state of charge of the battery unit 10 is lower than a preset threshold and the charging current transmitted by the external charging device 50 is not obtained, the battery management system 20 outputs a first signal to the switch unit 30, and the switch unit 30 turns off the electrical connection between the battery unit 10 and the battery management system 20 according to the first signal, that is, the battery unit 10 does not supply power to the battery management system 20, so as to reduce power consumption of the electrochemical device 100 and maintain a long storage time. When the state of charge is smaller than a preset threshold value and the electrochemical device 100 acquires the charging current transmitted by the external charging device 50, the battery management system 20 outputs a second signal to the switch unit 30, the switch unit 30 conducts the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal, so that after the external charging device 50 transmits the electric energy to the battery unit 10, the battery unit 10 supplies power to the battery management system 20.
It is understood that the first signal is used to break the electrical connection between the battery cell 10 and the battery management system 20 and the second signal is used to make the electrical connection between the battery cell 10 and the battery management system 20.
It is understood that when the external charging device 50 charges the electrochemical device 100, the electrochemical device 100 receives the charging current transmitted by the external charging device 50.
Referring to fig. 2, fig. 2 is a block diagram of an electrochemical device 100 according to a preferred embodiment of the present application.
In the embodiment of the present application, the battery management system 20 includes a first control unit 60 and a second control unit 223, the first control unit 60 is electrically connected to the switch unit 30, and the first control unit 60 is configured to control the switch unit 30 to turn on or off the electrical connection between the battery unit and the battery management system according to the signal output by the battery management system 20.
Specifically, when the state of charge is smaller than a preset threshold and the electrochemical device 100 does not acquire the charging current transmitted by the external charging apparatus 50, the second control unit 223 outputs a disconnection signal to the first control unit 60, the first control unit 60 outputs a first signal according to the signal output by the second control unit 223, and the first control unit 60 controls the switch unit 30 to disconnect the electrical connection between the battery unit 10 and the battery management system 20 according to the first signal. When the state of charge is smaller than a preset threshold and the electrochemical device 100 acquires the charging current transmitted by the external charging device 50, the first control unit 60 outputs a second signal, and the first control unit 60 controls the switch unit 30 to conduct the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal. When the state of charge is greater than or equal to the preset threshold, the battery management system 20 outputs a second signal to the first control unit 60, and the first control unit 60 controls the switch unit 30 to conduct the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal.
For example, when the state of charge is smaller than a preset threshold, and the electrochemical device 100 does not acquire a power supply signal of the external charging apparatus 50, that is, the state of charge is smaller than the preset threshold and does not acquire power supply of the external charging apparatus 50 at present, the second control unit 223 outputs a disconnection signal to the first control unit 60 or the switch unit 30, and when the disconnection signal is output to the first control unit 60, the first control unit 60 outputs a first signal to the switch unit 30 according to the disconnection signal, and the first control unit 60 controls the switch unit 30 to disconnect the electrical connection between the battery unit 10 and the battery management system 20 according to the first signal. When an off signal, which is the first signal, is output to the switching unit 30, the switching unit 30 disconnects the electrical connection between the battery unit 10 and the battery management system 20 according to the first signal. By this means, when the state of charge is less than the preset threshold and the battery unit 10 does not receive the charging of the external charging device 50, the electrical connection between the battery unit 10 and the battery management system 20 is disconnected, the battery unit 10 stops charging the battery management system 20, and the long-term storage of the electrochemical device 100 is maintained.
When the state of charge is smaller than a preset threshold, and the electrochemical device 100 obtains a power supply signal of the external charging device 50, that is, the current state of charge is smaller than the preset threshold and obtains power supply of the external charging device 50, the second control unit 223 outputs a conduction signal to the first control unit 60 or the switch unit 30, and when the conduction signal is output to the first control unit 60, the first control unit 60 outputs a second signal to the switch unit 30 according to the conduction signal, and the first control unit 60 controls the switch unit 30 to conduct electrical connection between the battery unit 10 and the battery management system 20 according to the second signal. When the on signal, which is the second signal, is output to the switching unit 30, the switching unit 30 turns on the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal. With this, when the state of charge is smaller than the preset threshold, and the battery unit 10 receives a signal that the external charging device 50 needs to supply power to the battery unit 10, and the battery unit 10 can receive the power supplied by the external charging device 50, the electrical connection between the battery unit 10 and the battery management system 20 is conducted, so that even if the battery unit 10 charges the battery management system 20, the power shortage of the battery unit 10 can be avoided.
When the state of charge is greater than or equal to the preset threshold, the second control unit 223 outputs a conduction signal to the first control unit 60 or the switch unit 30, and when the conduction signal is output to the first control unit 60, the first control unit 60 outputs a second signal to the switch unit 30 according to the conduction signal, and the first control unit 60 controls the switch unit 30 to conduct the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal. When the on signal, which is the second signal, is output to the switching unit 30, the switching unit 30 turns on the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal. Therefore, when the state of charge is greater than or equal to the preset threshold, the electrical connection between the battery unit 10 and the battery management system 20 is conducted, and the battery unit 10 charges the battery management system 20. Referring to fig. 3, fig. 3 is a block diagram of an electrochemical device 100 according to a preferred embodiment of the present application.
In the embodiment of the present application, the electrochemical device 100 further includes a first power management unit 70, where the first power management unit 70 is electrically connected between the first control unit 60 and an external charging device 50, and is configured to convert a first voltage output by the external charging device 50 into a second voltage to supply power to the first control unit 60, and the first control unit 60 controls the switch unit 30 to conduct the electrical connection between the battery unit 10 and the battery management system 20 according to the second signal.
In one possible implementation, the electrochemical device 100 further includes a second power management unit 80 and a second control unit 223;
the first end of the second power management unit 80 is electrically connected to the battery unit 10, the second end of the second power management unit 80 is electrically connected to the switch unit 30, the third end of the second power management unit 80 is electrically connected to the second control unit 223, and when the state of charge is smaller than a preset threshold and the electrochemical device 100 does not acquire the charging current transmitted by the external charging device 50, the second control unit 223 controls the first control unit 60 to control the output of the first signal, so that the switch unit 30 disconnects the electrical connection between the battery unit 10 and the battery management system 20 according to the first signal.
In one possible implementation manner, the battery charging system further includes a third power management unit 90, where the third power management unit 90 is electrically connected between the first power management unit 70 and the external charging device 50, and is configured to convert a third voltage output by the external charging device 50 into a first voltage, and transmit the converted first voltage to the first power management unit 70.
In one possible implementation manner, the charging system further includes a second diode D2 and a third diode D3, an anode of the second diode D2 is electrically connected to the third power management unit 90, a cathode of the second diode D2 is electrically connected to cathodes of the first power management unit 70 and the third diode D3, an anode of the third diode D3 is electrically connected to the second power management unit 80, and when the electrochemical device obtains the charging current transmitted by the external charging apparatus 50, the external charging apparatus 50 supplies power to the first control unit 60 through the second diode D2 and the third diode D3.
In the embodiment of the present application, when the switch unit 30 is in the off state, the second power management unit 80 is disconnected from the battery unit 10, and the second power management unit 80 cannot transmit the electric energy of the battery unit 10 to the battery management system 20, that is, the second power management unit 80 is controlled by the switch unit 30 to disconnect the electric connection between the battery unit 10 and the battery management system 20, so that the battery unit 10 no longer provides the electric energy to the battery management system 20. The switch unit 30 controls the second power management unit 80, that is, controls the power input of the battery management system 20, when the state of charge of the battery unit 10 is lower than a preset threshold, the battery unit 10 stops supplying power to the battery management system 20, and the battery management system 20 powers off, so that the power consumption of the battery unit 10 is reduced.
Referring to fig. 4, fig. 4 is a circuit diagram of an electrochemical device 100 according to a preferred embodiment of the present application.
The first power management unit 70 is electrically connected between the first control unit 60 and the external charging device 50, and is configured to convert a first voltage output by the external charging device 50 into a second voltage to supply power to the first control unit 60.
In the embodiment of the present application, the first power management unit 70 may receive the power of the third power management unit 90 and the second power management unit 80, and the third power management unit 90 and the second power management unit 80 may compete for power supply to the first power management unit 70.
The anode of the third diode D3 is electrically connected to the second power management unit 80, and the cathode of the third diode D3 is electrically connected to the first power management unit 70.
In the embodiment of the present application, the third diode D3 is used to realize unidirectional transmission of power between the second power management unit 80 and the first power management unit 70, and to supply the power of the second power management unit 80 to the first power management unit 70 in a unidirectional manner.
The anode of the second diode D2 is electrically connected to the third power management unit 90, and the cathode of the second diode D2 is electrically connected to the first power management unit 70.
In the embodiment of the present application, the second diode D2 is used to realize unidirectional transmission of power between the third power management unit 90 and the first power management unit 70, and to supply the power of the third power management unit 90 to the first power management unit 70 in a unidirectional manner.
In the embodiment of the present application, when the external charging device 50 is connected, for example, the external commercial power or the photovoltaic is connected, the energy storage inverter system 40 transmits the electric energy of the external charging device 50 to the third power management unit 90, the third power management unit 90 transmits the electric energy of the external charging device 50 to the first power management unit 70 through the second diode D2 in a single-way manner, and the first power management unit 70 supplies power to the first control unit 60, and after the first control unit 60 is powered on, the switch unit 30 is controlled to be turned on, so that the battery unit 10 is turned on to be electrically connected to the second power management unit 80, and the battery unit 10 is charged to the battery management system 20 through the second power management unit 80. Meanwhile, the second power management unit 80 transmits the electric energy of the second power management unit 80 to the first power management unit 70 through the third diode D3 in a unidirectional manner, and the first power management unit 70 supplies power to the first control unit 60, so that competitive power supply of the third power management unit 90 and the second power management unit 80 to the first control unit 60 is realized, and the first control unit 60 is prevented from being easily powered off when the external charging device 50 is unstable.
The anode of the first diode D1 is electrically connected to the external charging device 50, and the cathode of the first diode D1 is electrically connected to the second power management unit 80, for transmitting the electric power of the external charging device 50 to the second power management unit 80, so as to transmit the electric power to the battery management system 20 or the first control unit 60 through the second power management unit 80.
In the embodiment of the present application, the energy storage inverter system 40 is electrically connected to an external charging device 50, when an external commercial power or a photovoltaic is connected, the energy storage inverter system 40 cannot supply power to the first power management unit 70, the energy storage inverter system 40 unidirectionally transmits the electric energy of the external charging device 50 to the second power management unit 80 through the first diode D1, so that the second power management unit 80 can supply power to the first power management unit 70 and the battery management system 20, the first power management unit 70 supplies power to the first control unit 60, the first control unit 60 is powered on, the switch unit 30 is controlled to be switched on, and then the battery unit 10 is electrically connected to the second power management unit 80.
In the embodiment, as shown in fig. 4, the battery cell 10 may include a switch K, a fuse F, and a string of M batteries B1-BN, where M is an integer greater than or equal to 1. The switch K may be an electronic switch or a mechanical switch. The energy storage inverter system 40 may include a first converter 42, a second converter 41, and a capacitor C. The positive pole B + of the first string B1 is electrically connected to one end of the capacitor C and the first DC port of the first converter 42 through the switch K and the fuse F, the positive pole B + of the Mth string BN is electrically connected to the negative pole B-of the M-1 th string BN-1, and the negative pole B-of the Mth string BN is electrically connected to the other end of the capacitor C and the second DC port of the first converter 42. The third dc port of the first converter 42 is electrically connected to a dc port of the second converter 41, and an ac port of the second converter 41 is electrically connected to an external charging device 50 or a load (not shown).
In the present embodiment, the first converter 42 is a DC/DC converter, and the second converter 41 is a DC/AC converter.
In one of the possible implementations, the battery management system 20 includes a battery management unit 21 and a monitoring management unit 22.
The battery management unit 21 is electrically connected to the battery unit 10, and is configured to obtain parameters of the battery unit 10.
In the embodiment of the present application, the battery management unit 21 is configured to monitor parameters of the battery unit 10, including voltage, temperature, and the like of the battery unit 10, and upload the parameters to the monitoring management unit 22.
The monitoring management unit 22 is electrically connected to the battery management unit 21, acquires parameters monitored by the battery management unit 21, calculates a state of charge according to the acquired parameters, and specifically compares the state of charge with a preset threshold according to the state of charge signal, when the state of charge is smaller than the preset threshold, the monitoring management unit 22 outputs a first signal, and when the state of charge is greater than or equal to the preset threshold, the monitoring management unit 22 outputs a second signal. The monitoring management unit 22 communicates with the first control unit 60, and outputs a corresponding signal to the first control unit 60, so that the first control unit 60 outputs a first signal or a second signal. The monitoring management unit 22 is used for managing the charging and discharging processes of the battery unit 10.
In the embodiment of the present application, the battery management unit 21 includes N strings of battery management subunits 211, where N is an integer greater than 1. The battery management subunit 211 includes N analog front ends AFE1-AFEN, N bus isolation units ISO1-ISON, N optical coupling isolation units PC1-PCN, N first control chips UC1-UCN, N first electrical connection units NCA1-NCAN, and N second electrical connection units NCB1-NCBN, where the N first electrical connection units NCA1-NCAN may be electrical connection contacts, and the N second electrical connection units NCB1-NCBN may be electrical connection contacts. The N analog front ends AFE1-AFEN are electrically connected to the battery cell 10 through the corresponding first electrical connection units NCA1-NCAN, respectively, for example, the analog front end AFE1 is electrically connected to the battery cell 10 through the first electrical connection unit NCA1, and collects the voltage, temperature, and the like of the battery cell 10. The N analog front ends AFE1-AFEN are electrically connected with the corresponding control chips UC1-UCN through the N bus isolation units ISO1-ISON and the N optical coupling isolation units PC1-PCN, and the N control chips UC1-UCN are electrically connected with the monitoring management unit 22 through the corresponding second electrical connection units NCB1-NCBN respectively.
In the embodiment of the present application, the monitoring and managing unit 22 may include a third electrical connection unit 221, a third converter 43, and a second control unit 223, wherein one end of the third electrical connection unit 221 is electrically connected to the N second electrical connection units NCB1-NCBN, the other end of the third electrical connection unit 221 is electrically connected to one end of the third converter 43 and the second control unit 223, and the other end of the third converter 43 is electrically connected to the second control unit 223. The third converter 43 may be a DC/DC converter, and the third electrical connection unit 221 may be a contact. The second control unit 223 receives information collected by the N control chips UC1-UCN, calculates a state of charge according to the collected information, and outputs a corresponding signal to the first control unit 60 according to the state of charge, wherein the second control unit 223 includes a control chip U2.
In the embodiment of the present application, the switching unit 30 includes a switching tube Q1 and a fourth diode D4, a first end of the switching tube Q1 is electrically connected to the positive electrode of the battery unit 10, a second end of the switching tube Q1 is electrically connected to the anode of the fourth diode D4, a cathode of the fourth diode D4 is electrically connected to the second power management unit 80, and a third end of the switching tube Q1 is electrically connected to the first control unit 60.
In the embodiment of the present application, the first control unit 60 includes a first main control chip U1 and a current detection circuit 61. The first end of the first master control chip U1 is electrically connected to the first power management unit 70, the second end of the first master control chip U1 is electrically connected to one end of the current detection circuit 61, and the third end of the first master control chip U1 is electrically connected to the switch unit 30. The first master control chip U1 communicates with the control chip U2, and is configured to obtain a signal output by the control chip U2, output a first signal or a second signal according to the signal output by the control chip U2, and control the switching transistor Q1 to be turned on or off according to the first signal or the second signal. The other end of the current detection circuit 61 is electrically connected between the battery unit 10 and the other end of the capacitor C, and the current detection circuit 61 is configured to obtain an output current on a battery circuit.
In the case where the electrochemical device 100 operates in a high voltage environment, the second power management unit 80 may be a first transformer T1, and the first transformer T1 has a first-stage coil and a second-stage coil. The third power management unit 90 may be a second transformer T2, the second transformer T2 having a first stage winding and a second stage winding. The first power management unit 70 may be a third transformer T3, the third transformer T3 having a first stage winding and a second stage winding.
In a preferred embodiment of the present application, the switching transistor Q1 is a high voltage-tolerant, low leakage current electronic switch, such as a transistor, which may be a bipolar transistor or a field effect transistor, when the electrochemical device 100 operates in a high voltage environment. When the switch Q1 is a bipolar transistor, the third terminal of the switch Q1 corresponds to the base of the bipolar transistor, the first terminal of the switch Q1 corresponds to the collector or emitter of the bipolar transistor, and the second terminal of the switch Q1 corresponds to the emitter or collector of the bipolar transistor. When the switching transistor Q1 is a field effect transistor, the third terminal of the switching transistor Q1 corresponds to the gate of the field effect transistor, the first terminal of the switching transistor Q1 may be the drain or the source of the field effect transistor, and the second terminal of the switching transistor Q1 may be the source or the drain of the field effect transistor. In an N-type transistor, the voltage of the drain should be greater than or equal to the voltage of the source, so the position of the source and the drain will vary with the bias state of the transistor. In another embodiment, the switching tube Q1 may be mechanically switched. The switching tube Q1 may be an NMOS tube.
The first end of the switch tube Q1 is electrically connected between the battery unit 10 and the switch K, the second end of the switch tube Q1 is electrically connected to the anode of the fourth diode D4, the third end of the switch tube Q1 is electrically connected to the output end of the first main control chip U1, and the other end of the first main control chip U1 is electrically connected to the current detection circuit 61. A cathode of the fourth diode D4 is electrically connected to one end of the first winding of the first transformer T1, the other end of the first winding of the first transformer T1 is electrically connected to the first end of the switching tube Q1 through the battery cell 10, one end of the second winding of the first transformer T1 is grounded, and the other end of the second winding of the first transformer T1 is electrically connected to an anode of the third diode D3 and between the third electrical connection unit 221 and the fourth inverter 222. The cathode of the third diode D3 is electrically connected to the cathode of the second diode D2 and one end of the first coil of the third transformer T3, the other end of the first coil of the third transformer T3 is grounded, and two ends of the second coil of the third transformer T3 are electrically connected to the power input end of the first main control chip U1. An anode of the second diode D2 is electrically connected to one end of the second pole coil of the second transformer T2, the other end of the second pole coil of the second transformer T2 is grounded, one end of the first pole coil of the second transformer T2 is electrically connected to the energy storage inverter system 40, and the other end of the first pole coil of the second transformer T2 is grounded.
In the embodiment of the present application, the energy storage inverter system 40 further includes a switching tube Q2, a third main control chip U3, and a third converter 43, where the switching tube Q2 may be a high voltage resistant and low leakage current electronic switch, such as a transistor, and the transistor may be a bipolar transistor or a field effect transistor. The third converter 43 may be a DC/DC converter.
One end of the third inverter 43 is electrically connected to the first inverter 42, the other end of the third inverter 43 is electrically connected to the first end of the switch Q2, the third end of the switch Q2 is electrically connected to the third main control chip U3, and the second end of the switch Q2 is electrically connected to one end of the first pole coil of the second transformer T2.
The operation of the electrochemical device 100 of the present application will be described with reference to the circuit diagram of fig. 4 as an example.
When the battery management system 20 is in a working state, the N analog front ends AFE1-AFEN collect the voltage, temperature and other parameters of the M groups of battery packs B1-BN through the corresponding first electrical connection units NCA1-NCAN, and transmit the collected parameters to the corresponding control chips UC1-UCN through the respective optical coupling isolation units PC1-PCN in the battery management subunit 211, the N control chips UC1-UCN transmit the detected voltage, temperature and other parameter data to the control chip U2, the control chip U2 calculates the obtained charge state according to the obtained parameter data, compares the obtained charge state with a preset threshold, and when the charge state is lower than the preset threshold, the control chip U2 outputs a signal to the first main control chip U1, so that the first main control chip U1 turns off the switching tube Q1, after the switching tube Q1 is turned off, the anode of the battery unit 10 is electrically connected to one end of the first pole coil of the first transformer T1, the battery unit 10 cannot supply power to the first transformer T1, the first transformer T1 cannot output electric energy to the control chip U2, the control chip U2 is powered off, the charging and discharging processes of the battery unit 10 cannot be managed, and the battery management system 20 is powered off.
When the external charging device 50 is connected, the external charging device 50 performs power conversion through the energy storage inverter system 40, the third main control chip U3 is powered on to control the switching tube Q2 to be turned on, and simultaneously, the power of the external charging device 50 is transmitted to the second transformer T2 through the first inverter 42, the second inverter 41, the third inverter 43 and the switching tube Q2, the second transformer T2 transmits the power to the third transformer T3 through the second diode D2 to transmit the power to the first main control chip U1 through the third transformer T3, the first main control chip U1 is powered on to control the switching tube Q1 to be turned on, then an electrical connection path between the battery unit 10 and the first transformer T1 is closed, the battery unit 10 supplies power to the control chip U2 through the first transformer T1, and simultaneously, the first transformer T1 supplies power to the third transformer T3 through the third diode D3, therefore, the first transformer T1 and the third transformer T3 can supply power to the first master control chip U1 in a competition mode.
When an external charging device 50 is connected, but the electric energy of the energy storage inverter system 40 cannot charge the third transformer T3 through the second transformer T2, the energy storage inverter system 40 transmits the converted electric energy to one end of the first pole coil of the first transformer T1 through the first diode D1, so as to connect the electrical connection path between the first transformer T1 and the energy storage inverter system 40. The first transformer T1 supplies power to the first master control chip U1 and the control chip U2. And the first main control chip U1 and the control chip U2 are powered on.
In the above embodiment, a switch unit 30 is provided, so that the battery unit 10 is disconnected to charge the battery management system 20 when the state of charge of the battery unit 10 is lower than a preset threshold. In this way, the electrochemical device 100 according to the embodiment of the present disclosure can maintain a long storage time when the state of charge of the electrochemical device 100 is low and the external device cannot be charged in time.
In the embodiment of the present application, an electric vehicle including the energy storage inverter system 40 is further provided, and the electric vehicle includes the electrochemical device 100 provided in the embodiment of the present application. The electric vehicle may be an electric vehicle or a remote control vehicle, and it is understood that the electric vehicle is a vehicle using a battery or a toy vehicle, and the present application is not particularly limited thereto.
Claims (10)
1. The long standby electrochemical device is characterized by comprising a battery unit, a battery management system and a switch unit;
the switch unit is electrically connected between the battery management system and the battery unit;
the battery management system is used for acquiring the state of charge of the battery unit, and when the state of charge is smaller than a preset threshold value and the electrochemical device does not acquire the charging current transmitted by external charging equipment, the battery management system outputs a first signal to the switch unit and is used for controlling the switch unit to disconnect the electrical connection between the battery unit and the battery management system according to the first signal.
2. The electrochemical device of claim 1, wherein when said state of charge is less than a predetermined threshold,
and when the electrochemical device acquires the charging current transmitted by the external charging equipment, the battery management system outputs a second signal to the switch unit, and the switch unit switches on the electric connection between the battery unit and the battery management system according to the second signal.
3. The electrochemical device of claim 2, further comprising a first power management unit and a first control unit;
the first power management unit is electrically connected between the first control unit and an external charging device and used for converting a first voltage output by the external charging device into a second voltage to supply power to the first control unit, and the first control unit controls the switch unit to conduct the electrical connection between the battery unit and the battery management system according to the second signal.
4. The electrochemical device of claim 3, further comprising a first diode;
the anode of the first diode is electrically connected with an external charging device, and the cathode of the first diode is electrically connected with the battery management system;
when the state of charge is smaller than a preset threshold value and the electrochemical device acquires the charging current transmitted by the external charging equipment, the electric energy provided by the external charging equipment is input into the battery management system through the first diode.
5. The electrochemical device of claim 4, further comprising a second power management unit and a second control unit;
the first end of the second power management unit is electrically connected with the battery unit, the second end of the second power management unit is electrically connected with the switch unit and the first diode, and the third end of the second power management unit is electrically connected with the second control unit;
when the state of charge is smaller than a preset threshold value and the electrochemical device does not acquire the charging current transmitted by external charging equipment, the second control unit controls the first control unit to control and output the first signal.
6. The electrochemical device of claim 5, further comprising a third power management unit;
the third power management unit is electrically connected between the first power management unit and an external charging device, and is configured to convert a third voltage output by the external charging device into a first voltage, and transmit the converted first voltage to the first power management unit.
7. The electrochemical device of claim 6, further comprising a second diode and a third diode;
the anode of the second diode is electrically connected with the third power management unit, the cathode of the second diode is electrically connected with the cathodes of the first power management unit and the third diode, and the anode of the third diode is electrically connected with the second power management unit;
when the electrochemical device acquires the charging current transmitted by the external charging equipment, the external charging equipment supplies power to the first control unit through the second diode and the third diode.
8. The electrochemical device according to claim 5, wherein the switching unit comprises a switching tube, and a first end, a second end and a third end of the switching tube are electrically connected to the battery unit, the second power supply unit and the first control unit, respectively.
9. An energy storage system, comprising the electrochemical device according to any one of claims 1 to 8 and an energy storage inverter system electrically connected to the electrochemical device, wherein the energy storage inverter system is configured to convert the electric energy of an external charging device and transmit the converted electric energy to the electrochemical device, or convert the electric energy of the electrochemical device and transmit the converted electric energy to a load.
10. An electric vehicle comprising the electrochemical device according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023207812.3U CN214798907U (en) | 2020-12-28 | 2020-12-28 | Long standby electrochemical device, energy storage system and electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023207812.3U CN214798907U (en) | 2020-12-28 | 2020-12-28 | Long standby electrochemical device, energy storage system and electric vehicle |
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| CN214798907U true CN214798907U (en) | 2021-11-19 |
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| CN202023207812.3U Active CN214798907U (en) | 2020-12-28 | 2020-12-28 | Long standby electrochemical device, energy storage system and electric vehicle |
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