CN111095722B - Battery cell and control method for battery cell - Google Patents
Battery cell and control method for battery cell Download PDFInfo
- Publication number
- CN111095722B CN111095722B CN201880056708.5A CN201880056708A CN111095722B CN 111095722 B CN111095722 B CN 111095722B CN 201880056708 A CN201880056708 A CN 201880056708A CN 111095722 B CN111095722 B CN 111095722B
- Authority
- CN
- China
- Prior art keywords
- battery
- charge
- control unit
- discharge
- switcher
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 9
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000002265 prevention Effects 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 23
- 230000005669 field effect Effects 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The battery cell according to the embodiment reduces the cost required for the setting operation of the battery cell, and is provided with: a precharge control unit (4) capable of switching between a resistance and an electrical connection state of a path through which a discharge current from the battery pack (BT) and a charge current to the battery pack (BT) flow; a charge/discharge control unit (5) capable of switching the electrical connection state of the paths; and a control unit (CTR) that acquires the current detected by the current sensor (CSS), the voltages of the plurality of battery elements detected by the detection circuit, and the external voltage, controls the operations of the precharge control unit (4) and the charge/discharge control unit (5), increases the resistance of the path at the time of starting, and enables the battery group (BT) to be charged and discharged, cuts off the charging current to the battery group (BT) when the voltages of the plurality of battery elements are smaller than the external voltage, and reduces the resistance of the path by the precharge control unit (4), and enables the battery group (BT) to be charged when it is determined that the external voltage is reduced.
Description
Technical Field
The embodiment of the invention relates to a battery unit and a control method of the battery unit.
Background
A power supply device that converts ac power supplied from a commercial power supply or the like into predetermined dc power and supplies the dc power to a load is becoming popular. For example, when power supply from a commercial power source or the like to a power supply device is stopped, power is supplied from a backup battery device to the load in order to avoid abrupt stop of power supply to the load.
When a battery cell is connected to a main circuit in a state in which a load is connected to a power supply device and power is supplied from the power supply device to the load, an excessive current may flow into the battery cell according to a difference between an output voltage of the power supply device and a voltage of the battery cell. For example, in the case where the resistance of the battery element mounted on the battery cell is small, when the voltage of the battery cell group of the battery cell is detected on the power supply device side, even if the voltage of the main circuit is lowered to avoid an excessive charging current, there is a possibility that the control on the power supply device side is not time-consuming and the battery cell malfunctions.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2013-102595
Disclosure of Invention
First, the technical problem to be solved
Currently, in order to avoid an excessive current flowing into the battery cells, a method of supplying a charging current to the battery pack via a precharge resistor is used. However, when the difference between the output voltage of the power supply device and the voltage of the battery cell is large, the time until the precharge is released is long, and it is difficult to shorten the time required to set the power supply device.
The present invention has been made in view of the above circumstances, and an object thereof is to shorten a setting time when a battery unit is mounted to a power supply device and to reduce costs required for setting operations of the battery unit.
(II) technical scheme
The battery cell of the embodiment includes: a battery pack including a plurality of battery elements and a detection circuit for detecting voltages of the plurality of battery elements; a current sensor that detects currents flowing to the plurality of battery elements; a precharge control unit configured to be capable of switching between a resistance and an electrical connection state of a path through which a discharge current from the battery pack and a charge current to the battery pack flow; a charge/discharge control unit configured to be capable of switching an electrical connection state of the path; and a control unit that acquires the current detected by the current sensor, the voltage of the plurality of battery elements detected by the detection circuit, and an external voltage, and is capable of controlling operations of the precharge control unit and the charge/discharge control unit, wherein the control unit increases the resistance of the path at the time of start-up so as to be in a state in which the battery pack can be charged and discharged, compares the voltages of the plurality of battery elements with the external voltage, cuts off the charging current to the battery pack by the charge/discharge control unit when the voltages of the plurality of battery elements are smaller than the external voltage, reduces the resistance of the path by the precharge control unit, and makes an external request to reduce the external voltage, and enables the battery pack to be charged by the charge/discharge control unit when it is determined that the external voltage is reduced.
Drawings
Fig. 1 is a diagram for explaining a configuration example of a power supply system including a battery cell according to an embodiment.
Fig. 2 is a view schematically showing one configuration example of a battery device equipped with a battery cell of the embodiment.
Fig. 3 is a diagram schematically showing one configuration example of the battery cell of the embodiment.
Fig. 4 is a flowchart for explaining an example of the operation of the battery cell according to the embodiment.
Fig. 5 is a view schematically showing another example of the structure of the battery cell according to the embodiment.
Detailed Description
Hereinafter, a battery cell and a method of controlling the battery cell according to an embodiment will be described with reference to the accompanying drawings.
Fig. 1 is a diagram for explaining a configuration example of a power supply system including a battery cell according to an embodiment.
In this example, the power supply system is described as a system for supplying power to equipment operating at 365 days and 24 hours, such as a base station of a communication equipment. The power supply system of the present embodiment includes: a Power Supply device (SMPS: switch Mode Power Supply) 20, a battery device BS.
Ac power is supplied from the power interface 10 to the power supply device 20. The power interface 10 can be electrically connected to a commercial power source (Grid) and a Diesel Generator (DG). Ac power supplied from a commercial power source or a diesel generator is converted into ac power that can be input to the power supply device 20 through the power interface 10, and is supplied to the power supply device 20. The power supply device 20 converts ac power supplied from the power interface 10 into dc power, and supplies the dc power to the load 30. In the present embodiment, the power supply device 20 outputs a dc voltage of, for example, about 48 v.
The power supply device 20 includes a plurality of rectifiers 22 and a controller 24.
The rectifiers 22 are connected between the high-side main circuit wiring MCP and the low-side main circuit wiring MCN, respectively. The rectifiers 22 each include a switching element such as a MOSFET or an IGBT. The plurality of rectifiers 22 convert ac power into dc power by switching the switching elements at high speed, and can supply dc power to the load 30 via the main circuit wirings MCP and MCN.
The controller 24 controls the operations of the plurality of rectifiers 22, and controls the voltage and current of the dc power supplied to the load 30 and the battery device BS.
The controller 24 and the battery device BS may be configured to be capable of serial communication based on a CAN (control area network) protocol, an RS485 standard, and the like. The controller 24 may control the current supplied to the load 30 and the battery device BS based on information obtained from the battery device BS. The controller 24 may be configured to notify the data acquired from the battery device BS and the alarm to the outside (NOC).
The controller 24 is an arithmetic circuit including at least one processor such as a CPU (central processing unit) and an MPU (micro processing unit), and a memory storing a program to be executed by the processor.
The battery device BS is connected to the main circuit wirings MCP, MCN in parallel with the load 30. The battery device BS can supply a discharge current to the load 30 via the main circuit wirings MCP, MCN. The battery device BS can charge a built-in battery pack (shown in fig. 3) with a charging current supplied via the main circuit wirings MCP, MCN.
Fig. 2 is a view schematically showing one configuration example of a battery device equipped with a battery cell of the embodiment.
The battery device BS includes: a terminal P electrically connected to the high-potential side main circuit wiring MCP of the power supply device 20, a terminal N electrically connected to the low-potential side main circuit wiring MCN, and at least one battery cell UNT. The battery device BS of the present embodiment includes a plurality of battery cells UNT.
The plurality of battery units UNT are connected between a high-potential-side charge-discharge circuit and a low-potential-side charge-discharge circuit, wherein the high-potential-side charge-discharge circuit is electrically connected with the terminal P, and the low-potential-side charge-discharge circuit is electrically connected with the terminal N.
Since the plurality of battery units UNT have the same configuration, a configuration example of one battery unit UNT will be described below, and a description of the configuration of the other battery unit UNT will be omitted.
Fig. 3 is a diagram schematically showing one configuration example of the battery cell of the embodiment.
The battery unit UNT of the present embodiment includes: a plurality of battery elements of the battery group BT, a battery management circuit BMU, a positive electrode terminal TP, and a negative electrode terminal TN. The battery management circuit BMU includes: an address switch 1, a power switch 2, a display unit 3, a battery group BT detection circuit, a precharge control unit 4, a charge/discharge control unit 5, a fuse F, a current sensor CSS, and a control unit CTR.
The positive electrode terminal TP is electrically connected to the terminal P of the battery device BS via a high-potential-side charge/discharge circuit.
The negative electrode terminal TN is electrically connected to the terminal N of the ionization device BS via a charge-discharge circuit on the low potential side.
The address switch 1 is, for example, a double inline switch that is exposed to the outside from the case of the battery unit UNT and is operable by a user, and is, for example, a switch that can set an identifier such as an address used when the control unit CTR communicates.
The power switch 2 is a switch that is exposed to the outside from the case of the battery unit UNT and that can be operated by a user, for example. When the user operates the power switch 2 to start the battery unit UNT, power is supplied from, for example, the charge/discharge circuits PC and NC to the control circuit CTR.
The display unit 3 is, for example, configured to be exposed to the outside from the case of the battery unit UNT and to notify the user of the state of the battery unit UNT, and the operation is controlled by the control unit CTR. In the present embodiment, the display unit 3 includes, for example, one or a plurality of LEDs (light emitting diodes), and can be turned on and notify the user of the state of the battery unit UNT according to the state of charge, the state of discharge, a failure, and the like of the battery group BT by the control of the control unit CTR.
The battery pack BT includes a plurality of battery elements (not shown), and a detection circuit (not shown) that detects the voltage of the battery elements and the temperature of the battery pack BT.
The detection circuit of the battery group BT is configured to be able to communicate with the control section CTR, and periodically outputs values corresponding to the detected voltage and temperature to the control unit CTR.
The plurality of battery elements are respectively lithium ion batteries, for example. In the present embodiment, the battery group BT includes 42 battery elements, and the 42 battery elements are connected in series, for example, in a portion of 21 parallel-connected battery elements.
The positive electrode terminal of the battery group BT can be electrically connected to the positive electrode terminal P via the charge/discharge control unit 5 (the discharge control switcher DS and the charge control switcher CS). The negative electrode terminal of the battery group BT can be electrically connected to the negative electrode terminal N via the precharge control unit 4 (main switch MS or precharge switch PS) and the fuse F.
The current sensor CSS detects the output current of the battery group BT. The control unit CTR is supplied with a value corresponding to the current detected by the current sensor CSS.
The precharge control unit 4 is provided with a charge/discharge circuit PC on the high potential side or a charge/discharge circuit NC on the low potential side, and is configured to be capable of switching between a resistance and an electric connection state of a path through which a discharge current from the battery group BT and a charge current to the battery group BT flow. The precharge control unit 4 includes a main switch MS, a precharge switch PS, and a resistor R.
The main switch MS is, for example, a Field Effect Transistor (FET). The main switcher MS is provided with a charge/discharge circuit PC on the high potential side or a charge/discharge circuit NC on the low potential side, and switches the electric connection states of the paths through which the discharge current from the battery group BT and the charge current to the battery group BT flow. In the example shown in fig. 3, a main switcher MS is provided on a wiring connecting the negative terminal of the battery group BT and the negative terminal N of the battery unit UNT, and switches the electrical connection state of the negative terminal of the battery group BT and the negative terminal N of the battery unit UNT. The main switch MS is controlled to operate by the control unit CTR.
The precharge switch PS is, for example, a field effect transistor, and is connected in series with the resistor R. The precharge switcher PS and the resistor R are connected in parallel with the main switcher MS. The precharge switcher PS is controlled to operate by the control section CTR.
The charge/discharge control unit 5 includes a discharge control switcher DS, a charge control switcher CS, and backflow prevention devices D1 and D2. The charge/discharge control unit 5 is provided in the charge/discharge circuit PC on the high potential side or the charge/discharge circuit NC on the low potential side, and is configured to be capable of switching the electrical connection state of the path along which the charge current flows to the battery group BT and switching the electrical connection state of the path along which the discharge current from the battery group BT flows.
The charge control switcher CS is, for example, a field effect transistor. The charge control switcher CS is provided with a charge/discharge circuit PC on the high potential side or a charge/discharge circuit NC on the low potential side, and is configured to be able to switch the electrical connection state of the path along which the charge current flows to the battery group BT. In the example shown in fig. 3, the charge control switcher CS is provided in the charge/discharge circuit PC that connects the positive electrode terminal of the battery group BT and the positive electrode terminal TP of the battery unit UNT. A backflow preventing element D2 is connected in parallel to the charge control switcher CS, the direction in which the discharge current from the battery group BT flows being the forward direction. The backflow preventing element D2 is a diode. The charging control switcher CS is controlled to operate by the control unit CTR.
The discharge control switcher DS is, for example, a field effect transistor. The discharge control switcher DS is provided in either a high-potential-side charge/discharge circuit PC or a low-potential-side charge/discharge circuit NC, and is configured to be electrically connected to a path through which a discharge current from the battery group BT flows. In the example shown in fig. 3, the discharge control switcher DS is disposed in series with the charge control switcher CS in the charge/discharge circuit PC connecting the positive terminal of the battery group BT and the positive terminal TP of the battery unit UNT. A backflow preventing element D1 having a forward direction of the flow of the charging current to the battery group BT is connected in parallel to the discharge control switcher DS. The backflow preventing element D1 is a diode. The switcher DS for discharge control is composed of the control unit CTR controls the operation.
The control unit CTR is configured to be able to communicate with the detection circuit of the battery pack BT and the controller 24. The control unit CTR can control the operations of the main switch MS, the precharge switch PS, the discharge control switch DS, and the charge control switch CS based on the detection circuit of the battery pack BT, the current sensor CSS, and the information obtained from the charge/discharge circuits PC and NC.
The control unit CTR is an arithmetic circuit including at least one processor such as a CPU and an MPU, and a memory storing a program executed by the processor.
An example of the operation of the battery unit UNT will be described below.
In the power supply system including the battery unit UNT according to the present embodiment, for example, during normal operation, power supplied from a commercial power supply is converted into predetermined dc power, and power is supplied to the load 30. The state at this time is: the negative terminal of the battery group BT is electrically connected to the main circuit MCN of the power supply device 20 via the main switcher MS, and the positive terminal of the battery group BT is electrically connected to the main circuit MCP via the discharge control switcher DS and the charge control switcher CS.
For example, when power input from the commercial power supply to the power supply device 20 is stopped due to a power failure or the like of the commercial power supply, the voltages of the main circuits MCP, MCN drop, and power is supplied from the battery device BS to the load 30.
After that, when the commercial power supply is recovered from the power outage, the power supply device 20 converts the ac power supplied from the commercial power supply into the dc power and supplies the power to the load 30, and performs charging of the battery group BT of the battery device BS.
For example, in a state where power is supplied to the load 30 from the power supply device 20 to which the battery device BS is not connected, when the voltage of the battery group BT of the battery unit UNT is lower than the voltage between the main circuits MCP and MCN in a case where the battery device BS is connected to the main circuits MCP and MCN, an excessive current may flow into the battery group BT.
In addition, the battery group BT of the battery unit UNT may be charged not fully but in a state of charge of, for example, 50% at the time of shipment. At this time, when, for example, one of the plurality of battery cells of the battery device BS is replaced with a new battery cell UNT, the voltage of the battery group BT of the newly mounted battery unit UNT is lower than the voltage between the main circuits MCP, MCN, and an excessive current may flow into the battery group BT.
In contrast, the battery unit UNT according to the present embodiment operates as follows, whereby an excessive current can be prevented from flowing into the battery group BT.
Fig. 4 is a flowchart for explaining an example of the operation of the battery cell according to the embodiment.
When the battery unit UNT is started, the control unit CTR sets the precharge switch PS, the discharge control switch DS, and the charge control switch CS to a closed state, sets the main switch MS to an open state, and sets the battery group BT to a precharge state (step S1). In the precharge state, the negative electrode terminal of the battery BT is electrically connected to the negative electrode terminal TN via the resistor R, so that an excessive current can be prevented from flowing to the battery BT.
Next, the control unit CTR compares the voltage of the battery group BT (the voltages of the plurality of battery elements) with an external voltage (step S2). In the present embodiment, the external voltage is, for example, a voltage between the charge/discharge circuit PC (or the terminal P, the positive electrode terminal TP) on the high potential side and the charge/discharge circuit NC (or the terminal N, the negative electrode terminal TN) on the low potential side. The external voltage may be a value calculated using the value of the current detected by the current sensor CSS, the value of the voltage of the battery group BT, the resistance value of the resistor R, and the like.
The control unit CTR compares the voltage of the battery group BT with the external voltage, and when the voltage of the battery group BT is greater than the external voltage or the difference between the voltages is smaller than a predetermined threshold value, the precharge state is released in a state where the battery group BT can be charged and discharged, and the battery unit UNT can be operated normally (step S3). That is, the control unit CTR sets the charge control switcher CS to a closed state, sets the discharge control switcher DS to a closed state, and sets the main switcher MS to a closed state. At this time, the control unit CTR may set the precharge inverter PS to an open state or may set the precharge inverter PS to a closed state.
The control unit CTR compares the voltage of the battery group BT with the external voltage, and when the voltage of the battery group BT is smaller than the external voltage and the difference between the voltage of the battery group BT and the external voltage is equal to or greater than a predetermined threshold value, the precharge state is released in a state where only the discharge of the battery group BT is enabled (step S4). That is, the control unit CTR sets the charge control switcher CS to an open state, sets the discharge control switcher DS to a closed state, sets the main switcher MS to a closed state, and sets the precharge switcher PS to an open state. In this state, the negative electrode terminal of the battery group BT is electrically connected to the negative electrode terminal TN via the main switcher MS, and the positive electrode terminal of the battery group BT is electrically connected to the positive electrode terminal TP via the backflow preventing element D2 and the discharge control switcher DS, so that the charging current to the battery group BT is cut off.
In a state where only the discharge of the battery group BT is possible, for example, the operation of the external power supply device 20 is requested (or the supply of electric power from the commercial power supply or the like is stopped) and the external voltage is lowered (step S5).
For example, when the power supply device 20 stops operating, the external voltage of the battery unit UNT is reduced, and the discharge from the battery group BT is automatically performed. At this time, the control unit CTR may control the display unit 3 to display a request for restarting the power supply device 20 after stopping the operation. In addition, when the power supply device 20 and the control unit CTR are configured to be able to communicate, a signal requesting temporary stop of operation may be transmitted to the power supply device 20.
The control unit CTR can determine whether the external voltage is reduced by using, for example, the value of the current detected by the current sensor CSS. The control unit CTR can determine whether or not the external voltage is reduced by monitoring, for example, the voltage of the battery BT and the external voltage. When the decrease in the external voltage is detected and the discharge of the battery BT is started (step S6), the control unit CTR sets the charge control switcher CS to a closed state, and sets the battery BT to a state in which the battery BT can be charged (step S7).
In this stage, the control section CTR may display a request to restart the power supply device 20 via the display section 3. In addition, when the power supply device 20 and the control unit CTR are configured to be able to communicate, the control unit CTR may notify the power supply device 20 of a signal requesting restart.
The control unit CTR may control the display unit 3 to display that the battery group BT is in a state in which normal operation is possible. In addition, when the power supply device 20 and the control unit CTR are configured to be able to communicate, the control unit CTR may transmit a signal for notifying that the battery group BT is in a state where normal operation is possible to the power supply device 20.
In this state, when the power supply device 20 is restarted (or the supply of electric power from the commercial power source to the power supply device 20 is restarted), the power supply device 20 converts the ac electric power supplied from the commercial power source into dc electric power, and supplies the dc electric power to the load 30 and the battery device BS via the main circuits MCP, MCN.
The battery group BT of the battery unit UNT is charged with the dc power supplied from the power supply device BS, and the charging is completed in a state where the voltage of the battery group BT is balanced with the external voltage.
As described above, according to the battery unit UNT of the present embodiment, it is possible to limit an excessive charging current when the power supply device 20 is connected to the battery unit UNT, and to avoid a device failure caused thereby.
Further, by stopping the power supply device 20 in a state where only the battery unit UNT can be discharged and then restarting, the battery unit UNT can be connected to the power supply device 20 and brought into a state of normal operation.
As described above, the setting time when the battery unit UNT is mounted is basically the time required for stopping and restarting the power supply device 20, so that the time required for setting can be shortened. This can shorten the time until the battery unit UNT becomes capable of normal operation, and can shorten the operation time (that is, reduce the operation cost).
Next, another configuration example of the battery unit UNT will be described with reference to the drawings.
Fig. 5 is a view schematically showing another example of the structure of the battery cell according to the embodiment.
In this example, the battery unit UNT includes a charge/discharge precharge control section 6 instead of the precharge control section 4 and the charge/discharge control section 5. The charge/discharge precharge control section 6 has both the function of the precharge control section 4 and the function of the charge/discharge control section 5 of the battery unit UNT shown in fig. 3.
The charge/discharge precharge control section 6 is provided with a charge/discharge circuit PC on the high potential side or a charge/discharge circuit NC on the low potential side. The charge/discharge precharge control unit 6 is configured to be able to switch between a resistance and an electrical connection state of a path through which a discharge current from the battery group BT and a charge current to the battery group BT flow, and to switch between an electrical connection state of a path through which a charge current to the battery group BT flows and an electrical connection state of a path through which a discharge current from the battery group BT flows.
The charge/discharge precharge control unit 6 includes a precharge switcher PS, a resistor R, a discharge control switcher DS, and a charge control switcher CS.
The charge control switcher CS is, for example, a field effect transistor. The charge control switcher CS is provided in a charge/discharge circuit PC that connects the positive electrode terminal of the battery pack BT and the positive electrode terminal TP of the battery unit UNT. A backflow preventing element D2 is connected in parallel to the charge control switcher CS, the direction in which the discharge current from the battery group BT flows being the forward direction. The backflow preventing element D2 is a diode. The charging control switcher CS is controlled to operate by the control unit CTR.
The discharge control switcher DS is, for example, a field effect transistor. The discharge control switcher DS is disposed in series with the charge control switcher CS in a charge/discharge circuit PC connecting the positive terminal of the battery pack BT and the positive terminal TP of the battery unit UNT. A backflow preventing element D1 having a forward direction of the flow of the charging current to the battery group BT is connected in parallel to the discharge control switcher DS. The backflow preventing element D1 is a diode. The discharge control switcher DS is controlled to operate by the control unit CTR.
The precharge switch PS is, for example, a field effect transistor, and is connected in series with the resistor R. The precharge switcher PS and the resistor R are connected in parallel with the charge control switcher CS and the discharge control switcher DS. The precharge switcher PS is controlled to operate by the control section CTR.
In this example, both the discharge control switcher DS and the charge control switcher CS are opened or closed, thereby functioning as the same function as the main switcher MS that opens or closes the battery cell UNT shown in fig. 3. That is, the charge/discharge precharge control section 6 includes a precharge control section 4, and the precharge control section 4 includes a charge/discharge control section 5 instead of the main switch MS.
For example, in this example, in step S1 shown in fig. 4, the control unit CTR sets both the discharge control switcher DS and the charge control switcher CS to an off state instead of setting the main switcher MS to an off state.
In addition, for example, in step S3 shown in fig. 4, the control unit CTR sets both the discharge control switcher DS and the charge control switcher CS to a closed state instead of setting the main switcher MS to a closed state.
As described above, by controlling the operations of the discharge control switcher DS and the charge control switcher CS, the same effects as those of the battery cell UNT shown in fig. 3 can be obtained.
That is, the time until the battery unit UNT becomes capable of normal operation can be shortened, and the operation time (that is, the operation cost) can be shortened.
Several embodiments of the present invention have been described, but these embodiments are shown by way of example only and are not intended to limit the scope of the invention. These novel embodiments may be implemented in various other modes, and various omissions, substitutions, and changes may be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the claims and the scope equivalent thereto.
In the above embodiment, the plurality of battery cells UNT may each include a communication terminal, not shown. The battery unit UNT may be configured to be able to communicate with the controller 24 via a communication bus line (e.g., CAN bus line) electrically connected to the communication terminal.
Claims (7)
1. A battery cell is provided with:
a battery pack including a plurality of battery elements and a detection circuit for detecting voltages of the plurality of battery elements;
a current sensor that detects currents flowing to the plurality of battery elements;
a precharge control unit configured to be capable of switching between a resistance and an electrical connection state of a path through which a discharge current from the battery pack and a charge current to the battery pack flow;
a charge/discharge control unit configured to be capable of switching an electrical connection state of the path; a kind of electronic device
A control unit configured to acquire the current detected by the current sensor, the voltages of the plurality of battery elements detected by the detection circuit, and an external voltage, and to control operations of the precharge control unit and the charge/discharge control unit,
the control unit increases the resistance of the path at the time of starting so that the battery pack can be charged and discharged, compares the voltages of the plurality of battery elements with the external voltage, cuts off the charging current to the battery pack by the charge/discharge control unit when the voltages of the plurality of battery elements are smaller than the external voltage and the difference between the voltages of the plurality of battery elements and the external voltage is equal to or greater than a predetermined threshold value, reduces the resistance of the path by the precharge control unit, and requests the external voltage to be reduced, and enables the battery pack to be charged by the charge/discharge control unit when it is determined that the external voltage is reduced and the discharge of the battery pack is started.
2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,
the precharge control unit includes: a main switcher that switches an electrical connection state of the path through which a discharge current from the battery pack and a charge current to the battery pack flow; and a resistor and a precharge switcher connected in parallel with the main switcher and connected in series with each other,
the charge/discharge control unit includes: a charging control switcher disposed on the path; a first backflow prevention element connected in parallel with the charge control switcher in a forward direction in which a discharge current from the battery pack flows; a switcher for discharge control, which is arranged on the path; and a second reverse current prevention element that connects the direction of the flow of the charging current to the battery pack in parallel with the discharge control switcher as a forward direction.
3. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,
the precharge control unit includes: the charge and discharge control part; and a resistor and a precharge switcher connected in parallel with the charge/discharge control section and connected in series with each other,
the charge/discharge control unit includes: a charging control switcher disposed on the path; a first backflow prevention element connected in parallel with the charge control switcher in a forward direction in which a discharge current from the battery pack flows; a switcher for discharge control, which is arranged on the path; a second reverse current prevention element that connects in parallel with the discharge control switcher with a direction in which a charging current flows toward the battery pack as a forward direction; and a resistor and a precharge switcher connected in parallel with the charge control switcher and the discharge control switcher connected in series, and connected in series with each other.
4. A battery cell according to any one of claim 1 to 3, wherein,
the control unit compares the voltages of the plurality of battery elements with the external voltage at the time of starting, and sets the battery pack to be in a state capable of charging and discharging when the voltages of the plurality of battery elements are larger than the external voltage by the charge/discharge control unit, and reduces the resistance of the path by the precharge control unit.
5. A control method of a battery cell, which comprises the steps of,
the battery cell includes:
a battery pack including a plurality of battery elements and a detection circuit for detecting voltages of the plurality of battery elements;
a current sensor that detects currents flowing to the plurality of battery elements;
a precharge control unit configured to be capable of switching between a resistance and an electrical connection state of a path through which a discharge current from the battery pack and a charge current to the battery pack flow;
a charge/discharge control unit configured to be capable of switching an electrical connection state of the path,
it is characterized in that the method comprises the steps of,
when the battery pack is started, the pre-charge control part increases the resistance of the path, the charge/discharge control part is set to a state capable of charging and discharging the battery pack,
comparing the voltages of the plurality of battery elements with an external voltage,
when the voltages of the plurality of battery elements are smaller than the external voltage and the difference between the voltages of the plurality of battery elements and the external voltage is equal to or greater than a predetermined threshold value, the charging current to the battery pack is cut off by the charge/discharge control unit, and the resistance of the path is reduced by the precharge control unit,
an external reduction of the external voltage is requested,
when it is determined that the external voltage is reduced and the discharge of the battery pack is started, the battery pack is set to be chargeable by the charge/discharge control unit.
6. The method for controlling a battery cell according to claim 5, wherein,
whether the external voltage is reduced is determined based on a detection value of a current sensor that detects currents flowing to the plurality of battery elements.
7. The control method of a battery cell according to claim 5 or 6, wherein,
when the voltages of the plurality of battery elements are larger than the external voltage, the charge/discharge control unit enables the battery pack to be charged and discharged, and the precharge control unit reduces the resistance of the path.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017201824A JP6789910B2 (en) | 2017-10-18 | 2017-10-18 | Battery unit and battery unit control method |
| JP2017-201824 | 2017-10-18 | ||
| PCT/JP2018/038631 WO2019078240A1 (en) | 2017-10-18 | 2018-10-17 | Battery unit and battery unit control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111095722A CN111095722A (en) | 2020-05-01 |
| CN111095722B true CN111095722B (en) | 2023-10-27 |
Family
ID=66174135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880056708.5A Active CN111095722B (en) | 2017-10-18 | 2018-10-17 | Battery cell and control method for battery cell |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6789910B2 (en) |
| CN (1) | CN111095722B (en) |
| WO (1) | WO2019078240A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987791B (en) | 2020-08-18 | 2024-05-24 | 百度在线网络技术（北京）有限公司 | Battery module control device and method, power supply equipment and system |
| CN113285510A (en) * | 2021-05-31 | 2021-08-20 | 深圳市同德浩海科技有限公司 | Station battery charging and discharging control valve, control method and system |
| KR20220168909A (en) * | 2021-06-17 | 2022-12-26 | 주식회사 엘지에너지솔루션 | Battery management apparatus and method of the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764418A (en) * | 2008-10-09 | 2010-06-30 | 凹凸电子（武汉）有限公司 | Charging system and charging circuit for batteries, as well as method for controlling charging of the battery |
| CN104247198A (en) * | 2013-03-29 | 2014-12-24 | 三洋电机株式会社 | Power supply system and charging and discharging control method for power supply system |
| WO2017150722A1 (en) * | 2016-03-03 | 2017-09-08 | 株式会社 東芝 | Battery unit, battery system, and method for controlling battery system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10341535A (en) * | 1997-04-08 | 1998-12-22 | Sony Corp | Battery pack, control thereof, and recording medium |
| JP5487070B2 (en) * | 2010-10-13 | 2014-05-07 | 株式会社東芝 | Battery module, state-of-charge averaging device, and method for connecting battery module to battery system |
| JP6427743B2 (en) * | 2013-11-19 | 2018-11-28 | エリーパワー株式会社 | Storage battery unit, overcurrent control method and program |
| JP6434070B2 (en) * | 2016-05-20 | 2018-12-05 | 株式会社東芝 | Power supply |
-
2017
- 2017-10-18 JP JP2017201824A patent/JP6789910B2/en active Active
-
2018
- 2018-10-17 WO PCT/JP2018/038631 patent/WO2019078240A1/en active Application Filing
- 2018-10-17 CN CN201880056708.5A patent/CN111095722B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764418A (en) * | 2008-10-09 | 2010-06-30 | 凹凸电子（武汉）有限公司 | Charging system and charging circuit for batteries, as well as method for controlling charging of the battery |
| CN104247198A (en) * | 2013-03-29 | 2014-12-24 | 三洋电机株式会社 | Power supply system and charging and discharging control method for power supply system |
| WO2017150722A1 (en) * | 2016-03-03 | 2017-09-08 | 株式会社 東芝 | Battery unit, battery system, and method for controlling battery system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111095722A (en) | 2020-05-01 |
| JP6789910B2 (en) | 2020-11-25 |
| WO2019078240A1 (en) | 2019-04-25 |
| JP2019075933A (en) | 2019-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10541542B2 (en) | System and method for charging a battery pack | |
| US11264792B2 (en) | Secondary battery protection circuit, secondary battery protection apparatus and battery pack | |
| US10404095B2 (en) | Uninterruptible power supply unit | |
| EP3922503B1 (en) | Load access detection method, switch circuit and battery management system | |
| JP6068366B2 (en) | Storage system and control method of secondary battery pack | |
| CN111095722B (en) | Battery cell and control method for battery cell | |
| US20170155276A1 (en) | Uninterruptible power supply unit | |
| KR20120074214A (en) | Protective circuit and charging device | |
| KR20180032084A (en) | System and method for battery management using Balancing battery | |
| US11095150B2 (en) | Emergency dimming apparatus | |
| US10097036B2 (en) | Uninterruptible power source device | |
| CN107399287B (en) | Vehicle power system for boost start | |
| JP2015521017A (en) | Energy supply module as a two-port network, use of a separation device in the energy supply module, and method of operating the energy supply module | |
| KR102586102B1 (en) | Battery protection circuit and battery pack including same | |
| CN107785864B (en) | Monitoring unit for monitoring a circuit breaker and circuit breaker comprising such a unit | |
| CN110875622B (en) | Method for recovering deep discharge battery module and uninterrupted power supply system thereof | |
| US10122208B2 (en) | Power device | |
| JP2020145655A (en) | Energization control device | |
| US11431189B2 (en) | Power control circuit | |
| US20230099799A1 (en) | Electric power supply system for battery assembly control circuit of electricity storage device, and electricity storage device | |
| EP3890143A1 (en) | Battery pack and electric device system | |
| JP6972140B2 (en) | Power control device and control method of power control device | |
| JP6387498B2 (en) | Secondary battery charge control circuit | |
| CN116722627A (en) | Over-discharge protection method of battery pack, electric equipment and battery pack | |
| KR102294554B1 (en) | System and method for uninterruptible power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |