CN210669592U - Lithium ion battery cell voltage acquisition and equalization circuit - Google Patents
Lithium ion battery cell voltage acquisition and equalization circuit Download PDFInfo
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- CN210669592U CN210669592U CN201922180613.9U CN201922180613U CN210669592U CN 210669592 U CN210669592 U CN 210669592U CN 201922180613 U CN201922180613 U CN 201922180613U CN 210669592 U CN210669592 U CN 210669592U
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- 239000000178 monomer Substances 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 4
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 239000013078 crystal Substances 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 13
- 238000007599 discharging Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008667 sleep stage Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a cell voltage acquisition and equalization circuit of a lithium ion battery pack, wherein the battery pack comprises at least two cells which are connected in series and comprises a BMS control unit, a controller unit, a voltage acquisition module and a voltage equalization module; the voltage acquisition module and the voltage equalization module are respectively connected between the controller unit and each battery cell, and the controller unit is connected with the BMS control unit; the voltage acquisition module is suitable for acquiring a single voltage signal of each battery cell; the BMS control unit is suitable for issuing a voltage acquisition instruction or a voltage balancing instruction to the controller unit; the controller unit is suitable for processing all the monomer voltage signals acquired by the voltage acquisition module and sending the processed monomer voltage signals to the BMS control unit when receiving a voltage acquisition instruction; and driving the voltage balancing module to work when receiving the voltage balancing instruction. The utility model discloses it is as an organic whole with voltage balance to gather the electric pressure, can guarantee that all electric core voltages in the lithium ion battery group can both control at reasonable within range, and simple structure, with low costs.
Description
Technical Field
The utility model relates to a lithium ion battery group electricity core voltage gathers and equalizer circuit.
Background
The power battery is used as a core part of the electric automobile, and the development of the battery technology leads the electric automobile technology to continuously revolutionize and break through forward. The power battery is divided into lead-acid battery, nickel-hydrogen battery, nickel-cadmium battery, lithium ion battery and other types according to the material, wherein the lithium ion battery has the highest energy density, so the lithium ion battery has become the most main manufacturing type of the power battery. However, when the lithium ion battery is used, it is required to ensure that the voltage of the single battery cell is controlled within a reasonable range in the charging and discharging processes, so as to avoid the phenomenon that the over-voltage and under-voltage of the single battery cell affects the service life of the lithium ion battery pack. At present, a cell voltage sampling circuit of a lithium ion battery pack is mainly divided into two types, namely a discrete device type and a special integrated chip type.
The special integrated chip type mainly adopts BQ78PL102 of TI company and LTC6811 of Linear company, and the like special analog front end sampling chip, although the circuit integration level is high and the reliability is strong, the chips are expensive, and meanwhile, the fixed sampling channel causes low expandability and extremely high design and development cost.
The discrete device type mainly adopts a sampling hold circuit structure, namely, a switch array formed by a plurality of solid-state relays respectively transmits each cell voltage signal to a capacitor, and then ADC (analog to digital converter) equipment acquires voltages at two ends of the capacitor, so that each cell voltage is indirectly acquired. Although the method has strong expandability, the circuit structure is complex, the acquisition time sequence is long, and the sampling process is easily interfered to cause larger measurement errors; meanwhile, the circuit generally has no voltage balancing function, and the voltage of all the battery cells can not be controlled within a reasonable range.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art's defect, provide a lithium ion battery group electricity core voltage acquisition and equalizer circuit, it gathers and voltage balance is as an organic whole, can guarantee that all electric core voltages in the lithium ion battery group can both control at reasonable within range, and simple structure, with low costs.
In order to solve the technical problem, the technical scheme of the utility model is that: a lithium ion battery cell voltage acquisition and equalization circuit, the battery pack includes at least two cells connected in series in turn, it includes BMS control unit, voltage acquisition module and voltage equalization module; wherein,
the voltage acquisition module and the voltage balancing module are respectively connected between the controller unit and each battery cell, and the controller unit is connected with the BMS control unit;
the voltage acquisition module is suitable for acquiring a single voltage signal of each battery cell;
the BMS control unit is suitable for issuing a voltage acquisition instruction to the controller unit;
the controller unit is suitable for processing all the monomer voltage signals acquired by the voltage acquisition module and sending the processed monomer voltage signals to the BMS control unit when receiving a voltage acquisition instruction;
the BMS control unit is also suitable for issuing a corresponding voltage balancing instruction to the controller unit according to the received processed single voltage signal;
the controller unit is further adapted to drive the voltage balancing module to work according to the corresponding voltage balancing instruction so as to balance the voltage of the corresponding battery cell.
Further provided is a specific structure of a controller unit, which includes a microcontroller U7, a crystal oscillator OSC, a digital isolator U8, and a CAN transceiver U9; wherein,
the crystal oscillator OSC is connected between an XTAL pin and an EXTAL pin of the microcontroller U7;
the ADC input end of the microcontroller U7 is connected with the output end of the voltage acquisition module so as to convert the single voltage signal into a digital voltage signal and convert the digital voltage signal into a CAN communication data frame;
the CAN transceiver is connected with the BMS control unit through a CAN bus, and a TXD pin and an RXD pin of the microcontroller U7 are connected with the CAN transceiver U9 through a digital isolator U8 so as to send CAN communication data frames to the BMS control unit through the CAN transceiver and acquire a voltage acquisition command and a voltage equalization command issued by the BMS control unit through the CAN transceiver;
and the IO output end of the microcontroller U7 is connected with the input end of the voltage equalization module.
The voltage acquisition module comprises differential amplification circuits which correspond to the battery cores one by one, and each differential amplification circuit comprises an operational amplifier and four resistors; wherein,
the positive input end of the operational amplifier is connected with the positive electrode of the corresponding battery cell through a resistor, the negative input end of the operational amplifier is connected with the negative electrode of the corresponding battery cell through a resistor, and the output end of the operational amplifier is connected with the corresponding input end of the controller unit;
the positive input end of the operational amplifier is connected with the negative electrode of the battery pack through a resistor, and the negative input end of the operational amplifier is connected with the output end of the operational amplifier through a resistor.
The voltage balancing module comprises voltage balancing circuits which correspond to the battery cores one by one, and each voltage balancing circuit comprises an NPN triode, a PNP triode and a photoelectric coupler; wherein,
the positive input end of the photoelectric coupler is connected with the corresponding output end of the controller unit, the negative input end of the photoelectric coupler is grounded, one output end of the photoelectric coupler is connected with the base electrode of the NPN type triode, and the other output end of the photoelectric coupler is connected with the base electrode of the PNP type triode;
the collector of the NPN type triode is connected with the collector of the PNP type triode through a resistor, the emitter of the NPN type triode is connected with the anode of the corresponding battery cell, and the emitter of the PNP type triode is connected with the cathode of the corresponding battery cell.
Further, the battery pack comprises three battery cells which are sequentially connected in series.
After the technical scheme is adopted, the utility model discloses use discrete device combination circuit to replace special integrated chip, improved the scalability of sampling circuit, also reduced design development cost; meanwhile, the utility model adopts a parallel acquisition mode, compared with the serial acquisition structure of the existing discrete device type circuit, the sampling speed is accelerated, and the anti-interference performance of the sampling circuit is also enhanced; and the utility model discloses integrated voltage equalization module, can guarantee that all electric core voltage homoenergetic in the lithium ion battery group are controlled at reasonable within range. Compare in current group battery analog front end sampling module, the utility model has the advantages of circuit structure is simple, development cost is cheap and the interference killing feature is strong.
Drawings
Fig. 1 is a circuit diagram of the cell voltage acquisition and equalization circuit of the lithium ion battery pack of the present invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
As shown in fig. 1, a cell voltage acquisition and equalization circuit of a lithium ion battery pack, the battery pack includes at least two cells connected in series in sequence, and includes a BMS control unit, a controller unit, a voltage acquisition module and a voltage equalization module; wherein,
the voltage acquisition module and the voltage balancing module are respectively connected between the controller unit and each battery cell, and the controller unit is connected with the BMS control unit;
the voltage acquisition module is suitable for acquiring a single voltage signal of each battery cell;
the BMS control unit is suitable for issuing a voltage acquisition instruction to the controller unit;
the controller unit is suitable for processing all the monomer voltage signals acquired by the voltage acquisition module and sending the processed monomer voltage signals to the BMS control unit when receiving a voltage acquisition instruction;
the BMS control unit is also suitable for issuing a corresponding voltage balancing instruction to the controller unit according to the received processed single voltage signal;
the controller unit is further adapted to drive the voltage balancing module to work according to the corresponding voltage balancing instruction so as to balance the voltage of the corresponding battery cell.
As shown in fig. 1, the controller unit includes a microcontroller U7, a crystal oscillator OSC, a digital isolator U8, and a CAN transceiver U9; wherein,
the crystal oscillator OSC is connected between an XTAL pin and an EXTAL pin of the microcontroller U7;
the ADC input end of the microcontroller U7 is connected with the output end of the voltage acquisition module so as to convert the single voltage signal into a digital voltage signal and convert the digital voltage signal into a CAN communication data frame;
the CAN transceiver is connected with the BMS control unit through a CAN bus, and a TXD pin and an RXD pin of the microcontroller U7 are connected with the CAN transceiver U9 through a digital isolator U8 so as to send CAN communication data frames to the BMS control unit through the CAN transceiver and acquire a voltage acquisition command and a voltage equalization command issued by the BMS control unit through the CAN transceiver;
and the IO output end of the microcontroller U7 is connected with the input end of the voltage equalization module.
As shown in fig. 1, the voltage acquisition module includes differential amplification circuits corresponding to the battery cells one to one, where the differential amplification circuits include operational amplifiers and four resistors; wherein,
the positive input end of the operational amplifier is connected with the positive electrode of the corresponding battery cell through a resistor, the negative input end of the operational amplifier is connected with the negative electrode of the corresponding battery cell through a resistor, and the output end of the operational amplifier is connected with the corresponding input end of the controller unit;
the positive input end of the operational amplifier is connected with the negative electrode of the battery pack through a resistor, and the negative input end of the operational amplifier is connected with the output end of the operational amplifier through a resistor.
As shown in fig. 1, the voltage balancing module includes voltage balancing circuits corresponding to the battery cells one to one, and the voltage balancing circuits include NPN triodes, PNP triodes, and photocouplers; wherein,
the positive input end of the photoelectric coupler is connected with the corresponding output end of the controller unit, the negative input end of the photoelectric coupler is grounded, one output end of the photoelectric coupler is connected with the base electrode of the NPN type triode, and the other output end of the photoelectric coupler is connected with the base electrode of the PNP type triode;
the collector of the NPN type triode is connected with the collector of the PNP type triode through a resistor, the emitter of the NPN type triode is connected with the anode of the corresponding battery cell, and the emitter of the PNP type triode is connected with the cathode of the corresponding battery cell.
In this embodiment, the battery pack includes three CELLs connected in series in sequence, which are CELL0, CELL1, and CELL2, respectively;
the operational amplifier U1, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 form a differential amplification circuit, the input end of the differential amplification circuit is connected to the positive end and the negative end of the battery CELL CELL0, and the output end of the differential amplification circuit is connected to the ADC input end AD0 of the microcontroller U7;
the operational amplifier U2, the resistor R5, the resistor R6, the resistor R7 and the resistor R8 form a differential amplification circuit, the input end of the differential amplification circuit is connected to the positive end and the negative end of the battery CELL CELL1, and the output end of the differential amplification circuit is connected to the ADC input end AD1 of the microcontroller U7;
the operational amplifier U3, the resistor R9, the resistor R10, the resistor R11 and the resistor R12 form a differential amplification circuit, the input end of the differential amplification circuit is connected to the positive end and the negative end of the battery CELL2, and the output end of the differential amplification circuit is connected to the ADC input end AD2 of the microcontroller U7.
The voltage balancing module mainly comprises a photoelectric coupler U4, a photoelectric coupler U5, a photoelectric coupler U6, a resistor R13, a resistor R14, a resistor R15, an NPN type triode Q1, an NPN type triode Q3, an NPN type triode Q5, a PNP type triode Q2, a PNP type triode Q4 and a PNP type triode Q6; wherein,
the input end of a photoelectric coupler U4 is connected to a digital output end IO2 and a signal ground GND of a microcontroller U7, one output end is respectively connected to a base electrode of an NPN type triode Q1, the other output end is connected to a base electrode of a PNP type triode Q2 through a resistor R14, a collector electrode of the NPN type triode Q1 is connected to a collector electrode of a PNP type triode Q2 through a resistor R13, an emitter electrode of the NPN type triode Q1 is connected to an anode electrode of a battery CELL CELL2, an emitter electrode of the PNP type triode Q2 is connected to a negative electrode of the battery CELL CELL2, the resistor R13 is used as a discharge resistor for discharging electricity to the battery CELL CELL2 in a voltage balancing process to reduce the voltage of the battery CELL CELL2, and the resistor R14 is used as a base current;
the input end of a photoelectric coupler U5 is connected to a digital output end IO1 and a signal ground GND of a microcontroller U7, one output end is respectively connected to a base electrode of an NPN type triode Q3, the other output end is connected to a base electrode of a PNP type triode Q4 through a resistor R16, a collector electrode of the NPN type triode Q3 is connected to a collector electrode of a PNP type triode Q4 through a resistor R15, an emitter electrode of the NPN type triode Q3 is connected to an anode electrode of a battery CELL CELL1, an emitter electrode of the PNP type triode Q4 is connected to a negative electrode of the battery CELL CELL1, the resistor R15 is used as a discharge resistor for discharging electricity to the battery CELL CELL1 in a voltage balancing process to reduce the voltage of the battery CELL CELL1, and the resistor R16 is used as a base current;
the input end of the photoelectric coupler U6 is connected to the digital output end IO0 of the microcontroller U7 and the signal ground GND, one output end is connected to the base of the NPN type triode Q5, the other output end is connected to the base of the PNP type triode Q6 through the resistor R18, the collector of the NPN type triode Q5 is connected to the collector of the PNP type triode Q6 through the resistor R17, the emitter of the NPN type triode Q5 is connected to the positive electrode of the battery CELL2, the emitter of the PNP type triode Q6 is connected to the negative electrode of the battery CELL2, the resistor R17 is used as a discharge resistor for discharging for the battery CELL2 in the voltage balancing process to reduce the voltage, and the resistor R18 is used as the base current limiting resistor of the PNP type triode Q6 to ensure that the PNP type.
The utility model discloses a lithium ion battery group electricity core voltage gathers and equalizer circuit's working process specifically expresses and is:
in the initialization stage, the microcontroller U7 is powered on to start the initialization process, the crystal oscillator OSC provides a stable clock signal, the ADC sampling converter of the microcontroller U7 is set to a continuous channel sampling mode, and the CAN transceiver is ready to initialize; the digital output end IO0, the digital output end IO1 and the digital output end IO2 output low levels, the photoelectric coupler U4, the photoelectric coupler U5 and the photoelectric coupler U6 do not have driving signal input, photosensitive induced current of the output ends is zero, then the base currents of the triode Q1, the triode Q2, the triode Q3, the triode Q4, the triode Q5 and the triode Q6 are also zero, and therefore all the triodes are in a turn-off state.
Voltage acquisition working phase, microcontroller U7 receives the voltage acquisition instruction that the BMS control unit issued through the CAN transceiver, then microcontroller U7 starts ADC sampling function, and carry out simultaneous acquisition to each monomer voltage signal of voltage acquisition module output, convert its sampling data into CAN transceiver data frame, and send to BMS controller unit by the CAN transceiver, at this moment, microcontroller U7's digital output IO0, digital output IO1 and digital output IO2 are the low level, the voltage equalization module is in the state of not starting.
In the voltage balancing working stage, the microcontroller U7 receives a voltage balancing command issued by the BMS control unit through the CAN transceiver, if the command indicates to perform a voltage balancing operation on the CELL2, the microcontroller U7 changes the level of the digital output terminal IO2 to a high level state and starts a timer timing function, at this time, the photocoupler U4 receives a driving signal input, a photosensitive induced current at the output terminal thereof is generated, the triode Q1 and the triode Q2 also obtain a base current to be in a conducting state, so that the CELL2 and the discharge resistor R13 form a discharge loop, after a certain time of discharge, the microcontroller U7 changes the level of the digital output terminal IO2 to a low level state, the drive signal of the photocoupler U4 disappears to cause the base currents of the triode Q1 and the triode Q2 to be lost and cut off, the discharge loop formed by the CELL2 and the discharge resistor R13 is cut off, thus, the discharge process of the CELL2 is stopped; if the instruction indicates that the CELL1 is subjected to voltage balancing operation, the microcontroller U7 changes the level of the digital output terminal IO1 into a high level state, and starts a timer timing function, at this time, the photocoupler U5 obtains input of a driving signal, photosensitive induced current at the output terminal is generated, the triode Q3 and the triode Q4 also obtain base current and are in a conducting state, so that the CELL1 and the discharge resistor R15 form a discharge loop, after discharging for a certain time, when the timer timing is completed, the microcontroller U7 changes the level of the digital output terminal IO1 into a low level state, the driving signal of the photocoupler U4 disappears, so that the triode Q3 and the triode Q4 lose the base current and generate a cut-off CELL, the discharge loop formed by the CELL1 and the discharge resistor R15 is cut off, and the discharge process of the CELL1 stops; if the command indicates that the CELL0 is to be subjected to voltage balancing operation, the microcontroller U7 changes the level of the digital output terminal IO0 to a high level state and starts a timer timing function, at this time, the photocoupler U6 obtains input of a driving signal, photosensitive induced current at the output terminal is generated, the triode Q5 and the triode Q6 also obtain base current and are in a conducting state, so that the CELL0 and the discharge resistor R17 form a discharge loop, after discharging for a certain time, when the timer timing is completed, the microcontroller U7 changes the level of the digital output IO0 to a low level state, the driving signal of the photocoupler U4 disappears, so that the base current of the triode Q5 and the triode Q6 is lost and the CELL 6326 is cut off, the discharge loop formed by the CELL0 and the discharge resistor R17 is cut off, and the discharge process of the CELL0 stops. Because each equalizing channel of the voltage equalizing module is in an independent loop, the equalizing process of each cell voltage can be independently carried out. At this point, the microcontroller U7 will stop the ADC acquisition function.
In the sleep stage of the controller, the microcontroller U7 acquires a sleep command issued by the BMS control unit through the CAN transceiver, the microcontroller U7 stops the ADC sampling function, and changes the digital output IO0, the digital output IO1, and the digital output IO2 thereof to a low level state, and the microcontroller U7 sets the mode to be a wake-up mode by the CAN transceiver data frame, and then the microcontroller U7 stops the kernel to enter the sleep state.
In the controller wake-up stage, the microcontroller U7 acquires a wake-up instruction issued by the BMS control unit through the CAN transceiver and starts a wake-up initialization process, the crystal oscillator OSC provides a stable clock signal, the ADC sampling converter is set to a continuous channel sampling mode, the CAN transceiver completes initialization ready, and the digital output terminal IO0, the digital output terminal IO1, and the digital output terminal IO2 output low levels; and the microcontroller U7 waits for a voltage acquisition command or a voltage equalization command issued by the BMS control unit to enter a corresponding working stage.
The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (5)
1. A cell voltage acquisition and equalization circuit of a lithium ion battery pack, the battery pack comprises at least two cells which are connected in series in sequence, and is characterized in that,
the system comprises a BMS control unit, a controller unit, a voltage acquisition module and a voltage balancing module; wherein,
the voltage acquisition module and the voltage balancing module are respectively connected between the controller unit and each battery cell, and the controller unit is connected with the BMS control unit;
the voltage acquisition module is suitable for acquiring a single voltage signal of each battery cell;
the BMS control unit is suitable for issuing a voltage acquisition instruction to the controller unit;
the controller unit is suitable for processing all the monomer voltage signals acquired by the voltage acquisition module and sending the processed monomer voltage signals to the BMS control unit when receiving a voltage acquisition instruction;
the BMS control unit is also suitable for issuing a corresponding voltage balancing instruction to the controller unit according to the received processed single voltage signal;
the controller unit is further adapted to drive the voltage balancing module to work according to the corresponding voltage balancing instruction so as to balance the voltage of the corresponding battery cell.
2. The lithium ion battery pack cell voltage acquisition and equalization circuit of claim 1,
the controller unit comprises a microcontroller U7, a crystal oscillator OSC, a digital isolator U8 and a CAN transceiver U9; wherein,
the crystal oscillator OSC is connected between an XTAL pin and an EXTAL pin of the microcontroller U7;
the ADC input end of the microcontroller U7 is connected with the output end of the voltage acquisition module so as to convert the single voltage signal into a digital voltage signal and convert the digital voltage signal into a CAN communication data frame;
the CAN transceiver is connected with the BMS control unit through a CAN bus, and a TXD pin and an RXD pin of the microcontroller U7 are connected with the CAN transceiver U9 through a digital isolator U8 so as to send CAN communication data frames to the BMS control unit through the CAN transceiver and acquire a voltage acquisition command and a voltage equalization command issued by the BMS control unit through the CAN transceiver;
and the IO output end of the microcontroller U7 is connected with the input end of the voltage equalization module.
3. The lithium ion battery pack cell voltage acquisition and equalization circuit of claim 1,
the voltage acquisition module comprises differential amplification circuits which correspond to the battery cells one by one, and each differential amplification circuit comprises an operational amplifier and four resistors; wherein,
the positive input end of the operational amplifier is connected with the positive electrode of the corresponding battery cell through a resistor, the negative input end of the operational amplifier is connected with the negative electrode of the corresponding battery cell through a resistor, and the output end of the operational amplifier is connected with the corresponding input end of the controller unit;
the positive input end of the operational amplifier is connected with the negative electrode of the battery pack through a resistor, and the negative input end of the operational amplifier is connected with the output end of the operational amplifier through a resistor.
4. The lithium ion battery pack cell voltage acquisition and equalization circuit of claim 1,
the voltage balancing module comprises voltage balancing circuits which correspond to the battery cores one by one, and the voltage balancing circuits comprise NPN type triodes, PNP type triodes and photoelectric couplers; wherein,
the positive input end of the photoelectric coupler is connected with the corresponding output end of the controller unit, the negative input end of the photoelectric coupler is grounded, one output end of the photoelectric coupler is connected with the base electrode of the NPN type triode, and the other output end of the photoelectric coupler is connected with the base electrode of the PNP type triode;
the collector of the NPN type triode is connected with the collector of the PNP type triode through a resistor, the emitter of the NPN type triode is connected with the anode of the corresponding battery cell, and the emitter of the PNP type triode is connected with the cathode of the corresponding battery cell.
5. The lithium ion battery pack cell voltage acquisition and equalization circuit of claim 1,
the battery pack comprises three battery cells which are sequentially connected in series.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069781A (en) * | 2021-11-09 | 2022-02-18 | 联合汽车电子有限公司 | Battery cell balancing method of battery pack |
| CN114268150A (en) * | 2021-12-20 | 2022-04-01 | 上海瑞浦青创新能源有限公司 | Lithium battery balance control system and method |
| CN115800447A (en) * | 2022-11-29 | 2023-03-14 | 上海玫克生储能科技有限公司 | Battery active equalization ASIC chip |
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2019
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069781A (en) * | 2021-11-09 | 2022-02-18 | 联合汽车电子有限公司 | Battery cell balancing method of battery pack |
| CN114268150A (en) * | 2021-12-20 | 2022-04-01 | 上海瑞浦青创新能源有限公司 | Lithium battery balance control system and method |
| CN115800447A (en) * | 2022-11-29 | 2023-03-14 | 上海玫克生储能科技有限公司 | Battery active equalization ASIC chip |
| CN115800447B (en) * | 2022-11-29 | 2023-09-08 | 上海玫克生储能科技有限公司 | Battery active equalization ASIC chip |
| US12074299B2 (en) | 2022-11-29 | 2024-08-27 | Shanghai Makesens Energy Storage Technology Co, Ltd. | ASIC chip for performing active battery equalization |
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