CN117477726A - Control circuit and method for storage battery pack of intelligent evacuation centralized power supply - Google Patents
Control circuit and method for storage battery pack of intelligent evacuation centralized power supply Download PDFInfo
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- CN117477726A CN117477726A CN202311693176.5A CN202311693176A CN117477726A CN 117477726 A CN117477726 A CN 117477726A CN 202311693176 A CN202311693176 A CN 202311693176A CN 117477726 A CN117477726 A CN 117477726A
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- 238000001514 detection method Methods 0.000 claims abstract description 71
- 238000009529 body temperature measurement Methods 0.000 claims description 27
- 230000002159 abnormal effect Effects 0.000 claims description 16
- 230000000712 assembly Effects 0.000 claims description 2
- 238000000429 assembly Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract description 19
- 238000010586 diagram Methods 0.000 description 24
- 238000005070 sampling Methods 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Classifications
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- 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- 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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- 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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a storage battery pack control circuit and a method for an intelligent evacuation centralized power supply, wherein the circuit comprises an MCU circuit, a storage battery pack control circuit comprising n switches, a storage battery pack voltage detection circuit, a charge-discharge interface and n storage batteries; the first end and the second end of each storage battery are respectively connected with the second end and the third end of one switch, and n storage batteries are connected in series to the charge-discharge interface when the first end and the third end of each switch are connected; the MCU circuit obtains battery state information according to the voltage acquired by the battery voltage detection circuit, and outputs a control signal to the battery control circuit based on the battery state information so as to control the first end and the second end or the third end of each switch to be closed. According to the invention, a plurality of storage batteries are connected in series through the plurality of switches to form the storage battery pack for charging or discharging, and when the storage batteries in the storage battery pack have faults, the fault storage batteries can be bypassed through the corresponding switches, so that the rest storage batteries are continuously connected in series for charging or discharging.
Description
Technical Field
The invention relates to the technical field of storage batteries, in particular to a storage battery pack control circuit and method for an intelligent evacuation centralized power supply.
Background
At present, the intelligent fire emergency lighting and evacuation indicating system adopting centralized power supply is higher in reliability, the intelligent evacuation centralized power supply is a standby centralized power supply device, and the intelligent evacuation centralized power supply can provide power for fire emergency indicator lamps and fire emergency lighting lamps in the intelligent fire emergency lighting and evacuation indicating system. The intelligent evacuation centralized power supply is usually composed of a plurality of storage batteries in series to supply power to the outside, but when any storage battery in the storage battery fails, the whole storage battery can not be guaranteed to continue to supply power to the outside.
Patent document 1 (application publication number CN219458714U, application publication date 2023.08.01) discloses an open-circuit freewheel device for a storage battery pack, which is formed by connecting a plurality of storage batteries in series, wherein two ends of each storage battery are respectively connected with a diode VD in parallel, two ends of each storage battery are connected with the diode VT in parallel through a switch K, a charger is connected with the storage battery pack and a load, a detection module is used for detecting a voltage signal of the storage battery and a current signal of the storage battery pack and transmitting the voltage signal and the current signal to a control module, and the control module controls on-off of the switch K through a driving module; the control module also transmits the received signal data to the upper computer, so that the discharging follow current after the storage battery is opened can be solved, the charging follow current is satisfied, and the charging voltage of the storage battery pack is adjusted in real time due to the reduction of the number of the batteries.
However, patent document 1 still has the following technical problems:
1. when charging, only one storage battery is open, and a plurality of storage batteries can cause short-circuit faults when open.
2. The individual batteries cannot be charged.
3. When the storage battery is charged, the circuit drives the corresponding switch of the storage battery to act due to the falling off or poor contact of the storage battery terminal, but when the terminal is suddenly restored, the storage battery is short-circuited and burst.
4. The use of a double-pole switch is not suitable for discharging large current, and if the switch is not normally opened, the problem of short circuit occurs in hardware.
5. When discharging, the single storage battery is opened, the diode works with large current all the time, and the problem of heat dissipation of the diode is considered.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and the embodiment of the invention provides a storage battery control circuit and a storage battery control method for an intelligent evacuation centralized power supply.
In a first aspect, an embodiment of the present invention provides an intelligent evacuation centralized power supply storage battery control circuit, including: the device comprises an MCU circuit, a storage battery control circuit, a storage battery voltage detection circuit, a charge-discharge interface and n storage batteries;
the storage battery control circuit comprises n switches; wherein each switch includes a first end, a second end, and a third end, the first end of each switch being closed at the same time and only with either the corresponding second end or third end;
the first end and the second end of each storage battery in the n storage batteries are respectively connected with the second end and the third end of a corresponding switch in the n switches, and the n storage batteries are connected in series to the charge-discharge interface when the first end of each switch in the n switches is connected with the corresponding third end; wherein n is a positive integer;
the MCU circuit is connected with the storage battery control circuit and the storage battery voltage detection circuit; the storage battery voltage detection circuit is connected with each storage battery in the n storage batteries;
the storage battery voltage detection circuit is used for collecting the voltage of each storage battery in the n storage batteries;
the MCU circuit is used for obtaining battery state information according to the voltage acquired by the battery voltage detection circuit and outputting a control signal to the battery control circuit based on the battery state information;
the storage battery control circuit is used for controlling the first end of each switch of the n switches to be closed with the corresponding second end or third end according to the control signal.
In a second aspect, an embodiment of the present invention provides a method for controlling a storage battery pack of an intelligent evacuation centralized power supply, which is applied to the control circuit of a storage battery pack of an intelligent evacuation centralized power supply in the first aspect, and includes:
the storage battery voltage detection circuit in the intelligent evacuation centralized power supply storage battery control circuit collects the voltage of each storage battery in the n storage batteries and transmits the collected voltage to the MCU circuit in the intelligent evacuation centralized power supply storage battery control circuit;
the MCU circuit obtains battery state information according to the voltage acquired by the battery voltage detection circuit, and outputs a control signal to a battery control circuit in the intelligent evacuation centralized power supply battery control circuit based on the battery state information;
and the storage battery control circuit controls the first end of each switch of the n switches to be closed with the corresponding second end or third end according to the control signal.
The embodiment of the invention provides a storage battery control circuit and a method for an intelligent evacuation centralized power supply, wherein the circuit comprises an MCU circuit, a storage battery control circuit comprising n switches, a storage battery voltage detection circuit, a charge-discharge interface and n storage batteries; the first end and the second end of each storage battery are respectively connected with the second end and the third end of one switch, and n storage batteries are connected in series to the charge-discharge interface when the first end and the third end of each switch are connected; the MCU circuit obtains battery state information according to the voltage acquired by the battery voltage detection circuit, and outputs a control signal to the battery control circuit based on the battery state information so as to control the first end and the second end or the third end of each switch to be closed. According to the invention, a plurality of storage batteries are connected in series through the plurality of switches to form the storage battery pack for charging or discharging, and when the storage batteries in the storage battery pack have faults, the fault storage batteries can be bypassed through the corresponding switches, so that the rest storage batteries are continuously connected in series for charging or discharging.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a storage battery control circuit for an intelligent evacuation centralized power supply according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an MCU circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of a battery pack control circuit according to an embodiment of the present invention connected to a battery;
FIG. 4 is a circuit diagram of a battery pack temperature measurement circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a battery voltage detection circuit according to an embodiment of the present invention;
FIG. 6 is a schematic block diagram of a storage battery control circuit for an intelligent evacuation centralized power supply according to another embodiment of the present invention;
FIG. 7 is a circuit diagram of an MCU circuit according to another embodiment of the present invention;
fig. 8 is a circuit diagram of a battery pack control circuit according to another embodiment of the present invention, connected to a battery and a backup battery;
FIG. 9 is a circuit diagram of a temperature measurement circuit according to an embodiment of the present invention;
fig. 10 is a circuit diagram of a battery voltage detection circuit according to another embodiment of the present invention;
fig. 11 is a flowchart of a method for controlling a storage battery pack of an intelligent evacuation centralized power supply according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Any resistor mentioned in the embodiment of the invention is a first end of the resistor and a second end of the resistor in sequence from left to right if the resistor is horizontally arranged in the circuit diagram; the resistors are arranged perpendicular to the horizontal direction in the circuit diagram, and are a first end of the resistor and a second end of the resistor in order from top to bottom.
Referring to fig. 1 to 10, fig. 1 is a schematic block diagram of a control circuit of a storage battery pack of an intelligent evacuation centralized power supply according to an embodiment of the present invention; FIG. 2 is a circuit diagram of an MCU circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of battery connection of a battery pack control circuit according to an embodiment of the present invention; FIG. 4 is a circuit diagram of a battery pack temperature measurement circuit according to an embodiment of the present invention; fig. 5 is a circuit diagram of a battery voltage detection circuit according to an embodiment of the present invention; FIG. 6 is a schematic block diagram of a storage battery control circuit for an intelligent evacuation centralized power supply according to another embodiment of the present invention; FIG. 7 is a circuit diagram of an MCU circuit according to another embodiment of the present invention; FIG. 8 is a circuit diagram of a battery pack control circuit battery, backup battery connection according to another embodiment of the present invention; FIG. 9 is a circuit diagram of a temperature measurement circuit according to another embodiment of the present invention;
fig. 10 is a circuit diagram of a battery voltage detection circuit according to another embodiment of the present invention. Fig. 2 to fig. 5 can be understood as a circuit diagram of an intelligent evacuation centralized power supply storage battery pack control circuit provided in an embodiment of the present invention in which 3 storage batteries are used, and fig. 7 to fig. 10 can be understood as a circuit diagram of an intelligent evacuation centralized power supply storage battery pack control circuit provided in another embodiment of the present invention in which 3 storage batteries and 1 backup storage battery are used.
Referring to fig. 1 to 5, an intelligent evacuation centralized power supply storage battery pack control circuit provided by an embodiment of the present invention includes: MCU circuit 1, battery pack control circuit 2, battery pack voltage detection circuit 3, charge-discharge interface 4, and n batteries (BAT 1 … BATn,1 … n represents serial numbers as shown in FIG. 1); the battery pack control circuit 2 includes n switches (K1 … Kn,1 … n indicates a serial number as shown in fig. 1); wherein each switch includes a first end, a second end, and a third end, the first end of each switch being closed at the same time and only with either the corresponding second end or third end; the first end and the second end of each storage battery in the n storage batteries are respectively connected with the second end and the third end of a corresponding switch in the n switches, and the n storage batteries are connected in series to the charge-discharge interface 4 when the first end of each switch in the n switches is connected with the corresponding third end; wherein n is a positive integer; the MCU circuit 1 is connected with the storage battery control circuit 2 and the storage battery voltage detection circuit 3; the battery pack voltage detection circuit 3 is connected to each of the n batteries; the storage battery voltage detection circuit 3 is used for collecting the voltage of each storage battery in the n storage batteries; the MCU circuit 1 is used for obtaining battery state information according to the voltage acquired by the battery voltage detection circuit 3 and outputting a control signal to the battery control circuit 2 based on the battery state information; the storage battery control circuit 2 is configured to control the first end of each of the n switches to be closed with the corresponding second end or third end according to the control signal.
In this embodiment, the storage battery pack control circuit of the intelligent evacuation centralized power supply provided by the embodiment of the invention is composed of an MCU circuit 1, a storage battery pack control circuit 2, a storage battery pack voltage detection circuit 3, a charge-discharge interface 4 and n storage batteries. The battery pack control circuit 2 includes n switches, specifically, referring to fig. 1, n switches are respectively denoted as a 1 st switch K1 to an n switch Kn, n batteries are respectively denoted as a 1 st battery BAT1 to an n battery BAT, a first end and a second end of an i-th battery BAT are respectively connected with a second end and a third end of an i-th switch Ki, a first end of the i-th switch Ki is connected with a first end of an (i+1) -th battery BAT (i+1), a first end and a second end of the n-th battery BAT are respectively connected with a second end and a third end of the n-th switch, i is a positive integer, and i is less than or equal to (n-1); the second terminal K1 of the 1 st switch is connected to one terminal (a terminal as shown in fig. 1) of the charge-discharge interface 4, and the first terminal of the n-th switch is connected to the other terminal (B terminal as shown in fig. 1) of the charge-discharge interface 4. The first end of the battery may be a positive electrode or a negative electrode of the battery, and the second end of the battery may be a negative electrode if the first end of the battery is a positive electrode, and the second end of the battery may be a positive electrode if the first end of the battery is a negative electrode, and the present invention is not limited thereto. Meanwhile, when the first end of each switch of the n switches is connected with the corresponding third end, the n storage batteries are connected in series to the charge-discharge interface 4, then the n storage batteries can be connected in series through the n switches, n is the number of the required storage batteries, the storage battery pack is formed by connecting the n storage batteries in series and is connected to the charge-discharge interface 4, and the charge-discharge interface 4 is used for connecting a charger or a load in the intelligent fire emergency lighting and evacuation indicating system so that the charger charges the storage battery pack or the storage battery pack supplies power to the load. For example, 3 storage batteries of 12V are connected in series through 3 switches to form a storage battery pack shown in fig. 3, that is, bt+ and BGND in fig. 8 are connected to both ends (end a and end B shown in fig. 1) of the charge-discharge interface 4, and the charge-discharge interface 4 supplies 36V power to the load.
The intelligent evacuation centralized power supply storage battery pack control circuit provided by the embodiment of the invention is applied to an intelligent fire emergency lighting and evacuation indicating system, and can be integrated on a main board. In addition, the control circuit of the storage battery pack of the intelligent evacuation centralized power supply can be used as an independent part, and the MCU circuit 1 carries out information interaction with a main board of the intelligent fire emergency lighting and evacuation indicating system through a communication interface. The storage battery pack control circuit of the intelligent evacuation centralized power supply connects n storage batteries in series through n switches to form a storage battery pack to be connected to the charge-discharge interface 4 for charge or discharge, and firstly, the voltage of each storage battery in the storage battery pack is collected in real time through the storage battery pack voltage detection circuit 3. Then, the voltage acquired in real time by the battery voltage detection circuit 3 is analyzed and processed by the MCU circuit 1 to obtain battery state information, and the MCU circuit 1 outputs a control signal to the battery control circuit 2 based on the battery state information. And finally, the storage battery control circuit 2 controls the first end of each switch in the n switches to be closed with the corresponding second end or third end according to the control signal output by the MCU circuit 1, wherein the first end of the switch connected with the storage battery with normal battery state in the storage battery is continuously closed with the third end of the switch, and the first end of the switch connected with the storage battery with abnormal battery state in the storage battery is switched and connected to the second end. Therefore, when any one or more storage batteries in the storage battery pack have faults (such as open circuits), the storage batteries with abnormal battery states and the storage batteries with normal battery states can be completely disconnected from the series connection through corresponding switches physically, so that the storage batteries with abnormal battery states are bypassed, and the storage batteries with normal battery states can be ensured to be continuously connected in series to form a new storage battery pack for charging or discharging.
Due to the influence of various factors, after the battery pack works for a long time, the voltage of each battery is possibly uneven, the proportion of the voltage rise or fall of a single battery during charging or discharging is inconsistent, the charging or discharging of each battery is unbalanced, the charging or discharging of each battery can be coordinated by controlling the first end of each switch to be closed with the corresponding second end or third end of each switch in the n switches, so that the n batteries are subjected to dynamic combined balanced charging or discharging, and the use of the battery is prolonged, for example, the MCU circuit 1 analyzes that the voltage of one battery is too high when the battery pack is charged, and controls the first end of the corresponding switch of the battery to be switched and connected to the second end, so that the rest of the batteries are continuously charged across the section, and controls the first end of the corresponding switch of the spanned battery to be switched and connected to the third end when the rest of the batteries are charged to be consistent with the voltage of the spanned battery. In addition, in an embodiment, referring to fig. 3, the battery pack control circuit 2 further includes an equalizing charge circuit 23, where the equalizing charge circuit 23 includes n equalizing charge branches 231, each equalizing charge branch 231 is connected to two ends of n batteries and the MCU circuit 1, and the equalizing charge branches 231 are used for discharging the connected batteries, and when the battery pack is charged, if the MCU circuit 1 collects, in real time, that the voltage of the single battery exceeds a set threshold value or the voltage difference between the single batteries is greater than the set threshold value according to the battery pack voltage detection circuit 3, the corresponding equalizing charge branch 231 in the equalizing charge circuit 23 is driven to discharge the connected batteries, so as to equalize the voltages of the batteries when the battery pack is charged.
Specifically, the switch in the storage battery control circuit 2 is a single-pole double-contact conversion type switch, which can be a relay, and is beneficial to large-current discharge. Referring to fig. 3, preferably, the switch in the battery pack control circuit 2 is a relay, the first end, the second end and the third end of the switch are respectively corresponding to a common end, a normal open end and a normal closed end of the relay, that is, the battery pack control circuit 2 includes n relays, n relay driving circuits 24 may be further disposed in the battery pack control circuit 2, each relay driving circuit 24 is connected with a coil end of a corresponding one of the n relays and an IO port of the MCU circuit 1, and the MCU circuit 1 may control the corresponding battery to be removed from the battery pack or connected in series to the battery pack by controlling the common end and the normal open end or the normal closed end of the relay driving circuit 24 to close the corresponding relay. Alternatively, the switch in the battery pack control circuit 2 may also be a switch module composed of a MOS tube.
In an embodiment, the battery pack control circuit 2 further includes n freewheeling diode assemblies 21 (see VD1 to VD3 shown in fig. 8), each freewheeling diode assembly 21 being connected to a corresponding one of the n switches.
In this embodiment, referring to fig. 3, each freewheeling diode assembly 21 is connected to the first end and the second end of a corresponding one of the n switches, and when the first end of a corresponding battery connected to the second end of the switch is positive, the anode and the cathode of the freewheeling diode assembly 21 are respectively connected to the first end and the second end of the corresponding switch; and, when the first end of the corresponding battery connected to the second end of the switch is the negative electrode, the anode and the cathode of the freewheel diode assembly 21 are connected to the second end and the first end of the corresponding switch, respectively. When the n storage batteries are connected in series to form the storage battery pack to output large current, if an open circuit occurs in the storage battery pack, the corresponding freewheeling diode assembly 21 is conducted due to positive pressure on two sides, so that the rest storage batteries which are not faulty in the storage battery pack can be continuously output, and the uninterrupted discharge of the storage battery pack when the single storage battery or the plurality of storage batteries are open is realized. At the same time, the first end of the corresponding switch is controlled to be connected to the second end in a switching way, so that the current drops to be very low after the flywheel diode assembly 21 works briefly and spans the storage battery with the open circuit condition and the bypass flywheel diode assembly 21.
In an embodiment, the intelligent evacuation centralized power supply battery pack control circuit further includes a battery pack temperature measurement circuit 5, the battery pack temperature measurement circuit 5 is connected with the MCU circuit 1 and each of the n storage batteries, and the battery pack temperature measurement circuit 5 is configured to collect a temperature of each of the n storage batteries; the MCU circuit 1 is further used for controlling the first ends and the corresponding second ends of the corresponding switches to be closed when the storage batteries with abnormal temperature in the n storage batteries are detected according to the temperature acquired by the storage battery pack temperature measuring circuit 5.
Further, the battery pack temperature measuring circuit 5 includes n-way battery temperature measuring branches, each way battery temperature measuring branch is connected with the MCU circuit 1 and a corresponding one of the n batteries, and the battery temperature measuring branch is used for collecting the temperature of the connected battery.
In this embodiment, a battery pack temperature measuring circuit 5 is provided in the battery pack control circuit of the intelligent evacuation centralized power supply, and is used for implementing over-temperature protection of the battery, the temperature of each battery in the battery pack is collected in real time through the n-way battery temperature measuring branches in the battery pack temperature measuring circuit 5, the MCU circuit 1 analyzes and processes the temperature collected in real time by the battery pack temperature measuring circuit 5, and when detecting that the temperature of the battery in the battery pack is abnormal, the first end of the switch corresponding to the battery with abnormal temperature is controlled to be switched and connected to the second end, so that the abnormal temperature battery is removed from the battery pack, and the series connection of the battery with abnormal temperature and the rest battery is cut off. Specifically, referring to fig. 4, each of the battery temperature measurement branches includes a first resistor (R1) j Second resistor (R2) j Third resistor (R3) j And a first temperature sensor (T) j The n-way storage battery temperature measuring branch circuits are respectively marked as a 1 st-way storage battery temperature measuring branch circuit to an n-way storage battery temperature measuring branch circuit, and j represents the serial number of the storage battery temperature measuring branch circuit; for example, FIG. 4 includes a 3-way battery temperature measurement branch, and the 1 st-way battery temperature measurement branch includes a first resistor (R1) 1 Second resistor (R2) 1 Third resistor (R3) 1 And a first temperature sensor (T) 1 The 2 nd path of storage battery temperature measuring branch circuit comprises a first resistor (R1) 2 Second resistor (R2) 2 Third resistor (R3) 2 And a first temperature sensor (T) 2 The 3 rd path of storage battery temperature measuring branch circuit comprises a first resistor (R1) 3 Second resistor (R2) 3 Third resistor (R3) 3 And a first temperature sensor (T) 3 . For each storage battery temperature measuring branch, a first resistor (R1) j Through a second resistor (R2) j Grounded and a first resistor (R1) j And a second resistor (R2) j The connected nodes are connected with the MCU circuit 1; first resistor (R1) j And a third resistor (R3) j Is connected to the first temperature sensor (T) j Is connected with one end of the connecting rod; third resistor (R3) j And a first temperature sensor (T) j The other ends of the two terminals are connected with a power supply end VCC; first temperature sensor (T) j The method is used for acquiring the temperature of a corresponding one of the n storage batteries.
In one embodiment, the battery voltage detection circuit 3 includes n battery voltage detection branches 31; each storage battery voltage detection branch 31 is connected with a corresponding storage battery in the MCU circuit 1 and the n storage batteries, and the storage battery voltage detection branch 31 is used for collecting the voltage of the connected storage battery.
In this embodiment, the battery voltage detection circuit 3 collects the voltage of each battery in the battery in real time and transmits the collected voltage to the MCU circuit 1, specifically, referring to fig. 5, each battery voltage detection branch 31 includes a fourth resistor (R4) j Fifth resistor (R5) j Sixth resistor (R6) j Seventh resistor (R7) j Optocoupler relay (O1) j First linear optocoupler (OP 1) j And a first triode (Q1) j J represents the serial number of the battery voltage detection branch 31, and the battery voltage detection circuit 3 further includes a second triode Q2 and an eighth resistor R8, and a fourth resistor (R4) for each battery voltage detection branch 31 j A fourth resistor (R4) connected to the positive electrode of the corresponding battery j Is connected with the second end of the optocoupler relay (O1) j Is connected with the 4 th pin of the optical coupler relay (O1) j 3 rd pin of (a) and a first linear optocoupler (OP 1) j Is connected with the 1 st pin of the first linear optical coupler (OP 1) j The 4 th pin of the battery is connected with the cathode of the corresponding storage battery; optocoupler relay (O1) j Is passed through a fifth resistor (R5) j Is connected with a power end VCC, an optocoupler relay (O1) j And the first triode (Q1) j Is connected with the collector of the first triode (Q1) j Is grounded, the first triode (Q1) j Through a seventh resistor (R7) j The collector of the second triode Q2 is connected, the emitter of the second triode Q2 is connected with the power supply end VCC, and the base of the second triode Q2 is connected with one IO port of the MCU circuit 1 through an eighth resistor R8; first linear optocoupler (OP 1) j Is connected with a power end VCC, and a first linear optocoupler (OP 1) j Pin 3 of (B) is connected with the third resistor through the sixth resistorR6) j Grounding, first linear optocoupler (OP 1) j The 3 rd pin of the MCU circuit 1 is also connected with an IO port of the MCU circuit 1. Wherein, opto-coupler relay (O1) j A fourth resistor (R4) as a sampling switch for collecting the corresponding battery voltage by the battery voltage detection branch 31 j As a sampling current-limiting resistor, a sixth resistor (R6) j As the sampling resistor of the corresponding storage battery, the second triode Q2 is used as a main switch for controlling the operation of the n-path storage battery voltage detection branch circuit 31, and when the MCU circuit 1 drives the second triode Q2 to be conducted, the first triode (Q1) in each path of storage battery voltage detection branch circuit 31 is driven simultaneously j Conduction and driving optocoupler relay (O1) j And a first linear optocoupler (OP 1) j Conducting, the first linear optocoupler (OP 1) j The 3 rd pin of the battery is used for collecting the voltage of the corresponding storage battery. Preferably, optocoupler relay (O1) j The model of (1) may be TLP240GAF, first linear optocoupler (OP 1) j The model number of (a) may be PC817C.
In an embodiment, referring to fig. 6 to 10, the intelligent evacuation centralized power supply storage battery pack control circuit further includes m standby storage batteries, as shown in fig. 6, bat r1 … bat rm,1 … m indicates a serial number; the battery pack control circuit 2 further includes m switches, K (n+1) … K (n+m) as shown in fig. 6, and (n+1) … (n+m) represents a sequence number; the first end and the second end of each standby battery in the m standby batteries are respectively connected with the third end and the second end of a corresponding switch in the m switches, and the m standby batteries are connected in series between the charge-discharge interface 4 and the second end of the 1 st switch in the n switches when the first end of each switch in the m switches is connected with the corresponding second end; wherein m is a positive integer; the storage battery voltage detection circuit 3 is further used for collecting the voltage of each standby storage battery in the m standby storage batteries; the MCU circuit 1 is further configured to control the battery pack control circuit 2 to drive the first end and the corresponding second end or the third end of each of the m standby batteries to be closed, so that when a battery with an abnormal state exists in the n batteries, the first end and the corresponding second end of the corresponding switch in the n switches and the m switches are driven to be closed.
In this embodiment, m standby batteries are set in the control circuit of the storage battery pack of the intelligent evacuation centralized power supply, the m standby batteries are connected with the n storage batteries through m switches, when the n storage batteries are connected in series to form the storage battery pack to supply power to a load, if a fault occurs in the n storage batteries, the first end and the second end of the switch corresponding to the faulty storage battery in the n switches can be controlled to be closed, and the first end and the second end of the switch corresponding to the faulty storage battery in the m switches are controlled to be closed, so that the faulty storage battery in the storage battery pack is removed, and the corresponding standby storage battery and the rest storage batteries are connected in series to form a new storage battery pack to continuously supply power to the load, so that the voltage of the load is stable. For example, as shown in fig. 8, 3 storage batteries and 1 standby storage battery are arranged in the storage battery control circuit of the intelligent evacuation centralized power supply, bt+ and BGND in fig. 8 are connected to two ends of the charge-discharge interface 4, and the end a and the end B shown in fig. 6 can be powered by connecting 3 storage batteries in series, and when any storage battery in the 3 storage batteries fails, the standby storage battery is switched to be connected in series with the other 2 storage batteries which do not fail to supply power.
In an embodiment, the control circuit of the storage battery pack of the intelligent evacuation centralized power supply further includes a temperature measurement circuit 6, the temperature measurement circuit 6 is connected with the MCU circuit 1, the n storage batteries and the standby storage batteries, and the temperature measurement circuit 6 is configured to collect temperatures of each storage battery of the n storage batteries and each standby storage battery of the m standby storage batteries.
Further, the temperature measuring circuit 6 comprises an (n+m) path temperature measuring branch circuit; each temperature measuring branch is connected with the MCU circuit 1, and each temperature measuring branch is also connected with a corresponding storage battery or a standby storage battery in the n storage batteries and the m standby storage batteries respectively; the storage battery temperature measuring branch is used for collecting the temperature of a connected storage battery or a standby storage battery.
In this embodiment, referring to fig. 9, the circuit principle of the temperature measurement circuit 6 is the same as that of the aforementioned battery pack temperature measurement circuit 5, the circuit components included in each voltage detection branch 32 are the same as those included in each battery temperature measurement branch in the aforementioned battery pack temperature measurement circuit 5, and the corresponding description of the aforementioned battery pack temperature measurement circuit 5 in the embodiment can be referred to, so that those skilled in the art can clearly understand the circuit principle of the temperature measurement circuit 6, and for convenience and brevity of description, the description will not be repeated here.
In one embodiment, the battery voltage detection circuit 3 includes an (n+m) voltage detection branch 32; each voltage detection branch 32 is connected with the MCU circuit 1, each voltage detection branch 32 is further connected with the n storage batteries and a corresponding storage battery or a spare storage battery of the m spare storage batteries, and the storage battery voltage detection branch 31 is used for collecting voltages of the connected storage batteries or the spare storage batteries.
In this embodiment, referring to fig. 10, the circuit principle of the voltage detection branch 32 is the same as that of the aforementioned battery voltage detection branch 31, and the circuit components included in each voltage detection branch 32 are the same as those included in each battery voltage detection branch 31, which can be referred to the corresponding description in the aforementioned embodiment of the battery voltage detection branch 31, so that those skilled in the art can clearly understand the circuit principle of the voltage detection branch 32, and for convenience and brevity of description, the description is omitted herein.
In an embodiment, the battery pack control circuit 2 further includes (n+m) flywheel diode modules 22 (see VD1 to VD4 shown in fig. 8), each flywheel diode module 22 being connected to the n switches and a corresponding one of the m switches.
In the present embodiment, referring to fig. 8, n flywheel diode modules 22 of the (n+m) flywheel diode modules 22 are connected to a corresponding one of the n switches, and each flywheel diode module 22 of the n flywheel diode modules 22 is connected to a first end and a second end of a corresponding one of the n switches; in addition, m flywheel diode modules 22 are connected to a corresponding one of the m switches, and each flywheel diode module 22 of the m flywheel diode modules 22 is connected to the first end and the third end of the corresponding one of the m switches. The circuit principle of the freewheeling diode module 22 is the same as that of the freewheeling diode assembly 21 described above, and reference may be made to the corresponding description of the freewheeling diode assembly 21 in the foregoing embodiment, so that those skilled in the art can clearly understand the circuit principle of the freewheeling diode module 22, and for convenience and brevity of description, the description will not be repeated here.
Referring to fig. 11, fig. 11 is a flowchart of a method for controlling a storage battery pack of an intelligent evacuation centralized power supply according to an embodiment of the present invention. The intelligent evacuation centralized power supply storage battery pack control method provided by the embodiment of the invention is applied to the intelligent evacuation centralized power supply storage battery pack control circuit, and comprises the steps S11-S13.
And S11, a storage battery voltage detection circuit 3 in the storage battery control circuit of the intelligent evacuation centralized power supply collects the voltage of each storage battery in the n storage batteries and transmits the collected voltage to an MCU circuit 1 in the storage battery control circuit of the intelligent evacuation centralized power supply.
And S12, the MCU circuit 1 obtains battery state information according to the voltage acquired by the battery voltage detection circuit 3, and outputs a control signal to a battery control circuit 2 in the intelligent evacuation centralized power supply battery control circuit based on the battery state information.
And S13, the storage battery pack control circuit 2 controls the first end of each switch of the n switches to be closed with the corresponding second end or third end according to the control signal.
In this embodiment, when the switch in the battery pack control circuit 2 is not operated, the first end of the switch is closed with the corresponding third end, n storage batteries in the intelligent evacuation centralized power supply battery pack control circuit are connected in series through the n switches to form a storage battery pack, the storage battery pack is connected to the charge-discharge interface 4 for charging or discharging, and in the process of charging or discharging the storage battery pack, firstly, the storage battery pack voltage detection circuit 3 can collect the voltage of each storage battery in the storage battery pack in real time, and the collected voltage is transmitted to the MCU circuit 1 to detect whether the state of each storage battery is normal or not. Then, the MCU circuit 1 performs analysis processing according to the voltage acquired in real time by the battery voltage detection circuit 3 to obtain battery state information, and outputs a control signal to the battery control circuit 2 based on the battery state information. And finally, the storage battery control circuit 2 controls the first end of each switch in the n switches to be closed with the corresponding second end or third end according to the control signal output by the MCU circuit 1, wherein the first end of the switch connected with the storage battery with normal battery state in the storage battery is continuously closed with the third end of the switch, and the first end of the switch connected with the storage battery with abnormal battery state in the storage battery is switched and connected to the second end. In addition, if a standby battery is further provided in the battery pack control circuit of the intelligent evacuation centralized power supply, when the battery pack discharges, the battery state of the battery in the battery pack is abnormal, the control signal output by the MCU circuit 1 is further used for controlling the first end of the corresponding switch connected with the standby battery to be switched and connected to the second end, so that the standby battery and the battery with the abnormal battery state in the battery pack are connected in series to form a new battery pack to continue discharging. Therefore, when any one or more storage batteries in the storage battery pack have faults (such as open circuits), the storage batteries with abnormal battery states and the storage batteries with normal battery states can be completely disconnected from the series connection through corresponding switches physically, so that the storage batteries with abnormal battery states are bypassed, and the storage batteries with normal battery states can be ensured to be continuously connected in series to form a new storage battery pack for charging or discharging.
The invention discloses a control circuit and a control method for an intelligent evacuation centralized power supply storage battery pack, wherein a plurality of storage batteries are connected in series through a plurality of switches to form the storage battery pack for charging or discharging, and when the storage batteries in the storage battery pack have faults, the fault storage batteries can be bypassed through the corresponding switches, so that the rest storage batteries are continuously connected in series for charging or discharging.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. An intelligent evacuation centralized power supply storage battery control circuit is characterized by comprising: the device comprises an MCU circuit, a storage battery control circuit, a storage battery voltage detection circuit, a charge-discharge interface and n storage batteries;
the storage battery control circuit comprises n switches; wherein each switch includes a first end, a second end, and a third end, the first end of each switch being closed at the same time and only with either the corresponding second end or third end;
the first end and the second end of each storage battery in the n storage batteries are respectively connected with the second end and the third end of a corresponding switch in the n switches, and the n storage batteries are connected in series to the charge-discharge interface when the first end of each switch in the n switches is connected with the corresponding third end; wherein n is a positive integer;
the MCU circuit is connected with the storage battery control circuit and the storage battery voltage detection circuit; the storage battery voltage detection circuit is connected with each storage battery in the n storage batteries;
the storage battery voltage detection circuit is used for collecting the voltage of each storage battery in the n storage batteries;
the MCU circuit is used for obtaining battery state information according to the voltage acquired by the battery voltage detection circuit and outputting a control signal to the battery control circuit based on the battery state information;
the storage battery control circuit is used for controlling the first end of each switch of the n switches to be closed with the corresponding second end or third end according to the control signal.
2. The intelligent evacuation centralized power supply battery pack control circuit of claim 1, further comprising n freewheeling diode assemblies, each freewheeling diode assembly connected to the first and second ends of a corresponding one of the n switches.
3. The intelligent evacuation and centralized power supply battery pack control circuit of claim 1, further comprising a battery pack temperature measurement circuit connected with the MCU circuit and each of the n batteries, the battery pack temperature measurement circuit configured to collect a temperature of each of the n batteries;
the MCU circuit is also used for controlling the first ends and the corresponding second ends of the corresponding switches to be closed when the temperature of the n storage batteries is detected to be abnormal according to the temperature acquired by the storage battery pack temperature measuring circuit.
4. An intelligent evacuation and centralized power supply battery pack control circuit as claimed in claim 3 wherein the battery pack temperature measurement circuit comprises n battery temperature measurement branches, each battery temperature measurement branch being connected to the MCU circuit and a corresponding one of the n batteries, the battery temperature measurement branches being for collecting the temperature of the connected battery.
5. The intelligent evacuation centralized power supply battery pack control circuit of claim 1, wherein the battery pack voltage detection circuit comprises n battery voltage detection branches; each storage battery voltage detection branch is connected with a corresponding storage battery in the MCU circuit and the n storage batteries, and the storage battery voltage detection branch is used for collecting the voltage of the connected storage battery.
6. The intelligent evacuation and centralized power supply battery pack control circuit of claim 1, further comprising m backup batteries; the storage battery control circuit further comprises m switches;
the first end and the second end of each standby storage battery in the m standby storage batteries are respectively connected with the third end and the second end of a corresponding switch in the m switches, and the m standby storage batteries are connected in series between the charge-discharge interface and the second end of a 1 st switch in the n switches when the first end of each switch in the m switches is connected with the corresponding second end; wherein m is a positive integer;
the storage battery voltage detection circuit is also used for collecting the voltage of each standby storage battery in the m standby storage batteries;
the MCU circuit is also used for controlling the storage battery control circuit to drive the first end and the corresponding second end or the third end of each of the m standby storage batteries to be closed, so that when the storage batteries with abnormal states exist in the n storage batteries, the first ends and the corresponding second ends of the n switches and the corresponding switches in the m switches are driven to be closed.
7. The intelligent evacuation and centralized power supply battery pack control circuit of claim 6, further comprising a temperature measurement circuit connected to the MCU circuit, the n batteries, and the backup batteries, the temperature measurement circuit configured to collect a temperature of each of the n batteries and each of the m backup batteries.
8. The intelligent evacuation centralized power supply battery pack control circuit of claim 6, wherein the battery pack voltage detection circuit comprises an (n+m) voltage detection branch; each voltage detection branch is connected with the MCU circuit, each voltage detection branch is also connected with the n storage batteries and a corresponding storage battery or standby storage battery in the m standby storage batteries respectively, and the storage battery voltage detection branch is used for collecting the voltage of the connected storage battery or standby storage battery.
9. The intelligent evacuation centralized power supply battery pack control circuit of claim 6, further comprising (n+m) freewheeling diode modules, each freewheeling diode module connected to the first and second ends of a corresponding one of the n switches and the m switches.
10. An intelligent evacuation centralized power supply storage battery control method applied to the intelligent evacuation centralized power supply storage battery control circuit as claimed in any one of claims 1 to 9, comprising:
the storage battery voltage detection circuit in the intelligent evacuation centralized power supply storage battery control circuit collects the voltage of each storage battery in the n storage batteries and transmits the collected voltage to the MCU circuit in the intelligent evacuation centralized power supply storage battery control circuit;
the MCU circuit obtains battery state information according to the voltage acquired by the battery voltage detection circuit, and outputs a control signal to a battery control circuit in the intelligent evacuation centralized power supply battery control circuit based on the battery state information;
and the storage battery control circuit controls the first end of each switch of the n switches to be closed with the corresponding second end or third end according to the control signal.
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| CN202311693176.5A CN117477726A (en) | 2023-12-11 | 2023-12-11 | Control circuit and method for storage battery pack of intelligent evacuation centralized power supply |
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| CN202311693176.5A CN117477726A (en) | 2023-12-11 | 2023-12-11 | Control circuit and method for storage battery pack of intelligent evacuation centralized power supply |
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