CN211554253U - Real-time measurement circuit for voltage of single battery in series battery pack - Google Patents

Real-time measurement circuit for voltage of single battery in series battery pack Download PDF

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CN211554253U
CN211554253U CN201922271561.6U CN201922271561U CN211554253U CN 211554253 U CN211554253 U CN 211554253U CN 201922271561 U CN201922271561 U CN 201922271561U CN 211554253 U CN211554253 U CN 211554253U
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resistor
operational amplifier
battery
series
input end
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章发群
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Jieneng Electronics Shenzhen Co ltd
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Jieneng Electronics Shenzhen Co ltd
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Abstract

The utility model discloses a real-time measurement circuit of monomer battery voltage in series battery group, including series battery group 1, measuring element 2 and analog-to-digital conversion unit 3, series battery group 1 includes battery Bx, battery Bn and battery Ba, analog-to-digital conversion unit 3 includes voltage input end Sn, voltage input end S2 and voltage input end S1. The real-time measuring circuit for the voltage of the single battery in the series battery pack adopts a single integrated operational amplifier to finish voltage measurement and amplification, and compared with the prior art, the real-time measuring circuit is simple in circuit and low in energy consumption; when the battery is charged and discharged normally, the voltage of the battery is changed in only one interval, the voltage reference chip U1 is adopted, a reasonable voltage reference is selected, data of voltage variation of the battery Bn can be extracted, and the data are amplified and then transmitted to the AD conversion circuit.

Description

Real-time measurement circuit for voltage of single battery in series battery pack
Technical Field
The utility model relates to a measurement technical field of monomer battery voltage in the series battery group specifically is a real-time measurement circuit of monomer battery voltage in the series battery group.
Background
In the occasions requiring high voltage or high power application, a plurality of chargeable and dischargeable batteries are often connected in series to form a battery pack. The residual capacity among the single batteries of the series battery pack is inconsistent due to the limitations of the process level and the manufacturing cost of the current batteries, the inconsistency of the parameters of the batteries, the difference of the application environments and other factors. In severe cases, the individual batteries may be damaged by overcharge or overdischarge during charge and discharge, and the battery pack may not be used. Therefore, in practical application of the series battery pack, a measurement circuit for monitoring the voltage of the single battery in the series battery pack is provided to accurately judge the battery state and protect the battery.
The existing method for measuring the voltage of the single battery in the series battery pack generally adopts a controllable switch network to gate a certain single battery in a time-sharing manner to measure the voltage, or adopts a constant current source to realize potential conversion. The former circuit control is relatively complicated and cannot realize real-time synchronous detection, and the latter has high precision requirement on the constant current source, and when the serial connection quantity is large, the constant current source is required to have high withstand voltage and large electric quantity loss.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a real-time measurement circuit of battery cell voltage in the series battery group can solve the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme: a real-time measurement circuit of single battery voltage in a series battery pack comprises a series battery pack 1, a measurement unit 2 and an analog-digital conversion unit 3, wherein the series battery pack 1 comprises a battery Bx, a battery Bn and a battery Ba, the measurement unit 2 comprises an operational amplifier OPx, an operational amplifier OP1, an operational amplifier OPa, a voltage reference chip Ux1, a voltage reference chip U1, a voltage reference chip Ua1, a resistor Rx1, a resistor R1, a resistor Ra1, a resistor Rx2, a resistor R2, a resistor Ra2, a resistor Rx3, a resistor R3, a resistor Ra3, a resistor Rx4 resistor R4, a resistor Ra4, a resistor Rx5, a resistor R5, a resistor Ra5, a resistor Rx6, a resistor R6, a resistor Ra6, a resistor Rx7, a resistor R7 and a resistor Ra7, and the analog-digital conversion unit 393 comprises a voltage Sn input end, a voltage input end S2 and a voltage input end S1.
Preferably, the positive terminal of the battery Bx is connected in series with the resistor Rx1, and then is connected to the positive terminal of the input terminal of the operational amplifier OPx, the input end of the voltage reference chip Ux1 is connected with the positive/negative electrode end of the battery Bx, the output end of the voltage reference chip Ux1 is connected with the negative electrode of the input end of the operational amplifier OPx after being connected with the resistor Rx3 in series, two electrodes of the resistor Rx2 are respectively connected with the positive electrode of the input end of the operational amplifier OPx and the ground end, the two electrodes of the resistor Rx4 are respectively connected with the negative electrode of the input end of the operational amplifier OPx and the ground terminal, two electrodes of the resistor Rx5 are respectively connected with the negative electrode of the input end of the operational amplifier OPx, the series resistor Rx6 and the resistor Rx7, the resistor Rx6 and the resistor Rx7 are connected to the output end of the operational amplifier OPx, the positive power supply terminal of the operational amplifier OPx is connected to a power supply Vcc, the negative power supply terminal of the operational amplifier OPx is connected to the ground terminal, and the output end of the operational amplifier OPx is connected to the voltage input end Sn;
preferably, the positive terminal of the battery Bn is connected in series with the resistor R1, and then connected to the positive terminal of the input terminal of the operational amplifier OP1, the input end of the voltage reference chip U1 is connected with the positive/negative electrode end of the battery Bn, the output end of the voltage reference chip U1 is connected with the negative electrode of the input end of the operational amplifier OP1 after being connected with the resistor R3 in series, two poles of the resistor R2 are respectively connected with the positive electrode of the input end of the operational amplifier OP1 and the grounding end, two poles of the resistor R4 are respectively connected with the negative pole of the input end of the operational amplifier OP1 and the grounding end, two poles of the resistor R5 are respectively connected with the negative electrode of the input end of the operational amplifier OP1, the series resistor R6 and the resistor R7, the resistor R6 and the resistor R7 are connected to the output end of the operational amplifier OP1, the positive power supply end of the operational amplifier OPx1 is connected with a power supply Vcc, the negative power supply end of the operational amplifier OP1 is connected with the ground end, and the output end of the operational amplifier OP1 is connected with a voltage input end S2;
preferably, the positive terminal of the battery Ba is connected in series with the resistor Ra1, then is connected to the positive terminal of the input end of the operational amplifier OPa, the input end of the voltage reference chip Ua1 is connected with the positive/negative electrode end of the battery Ba, the output end of the voltage reference chip Ua1 is connected with the negative electrode of the input end of the operational amplifier OPa after being connected with the resistor Ra3 in series, two electrodes of the resistor Ra2 are respectively connected with the positive electrode of the input end of the operational amplifier OPa and the grounding end, two poles of the resistor Ra4 are respectively connected with the negative pole of the input end of the operational amplifier OPa and the grounding end, two poles of the resistor Ra5 are respectively connected with the negative electrode of the input end of the operational amplifier OPa, the series resistor Ra6 and the resistor Ra7, the resistor Ra6 and the resistor Ra7 are connected to the output end of the operational amplifier OPa, the positive power supply end of the operational amplifier OPa is connected with the power supply Vcc, the negative power supply end of the operational amplifier OPa is connected with the ground end, and the output end of the operational amplifier OPa is connected with the voltage input end S1.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the real-time measuring circuit for the voltage of the single battery in the series battery pack adopts a single integrated operational amplifier to finish voltage measurement and amplification, and compared with the prior art, the real-time measuring circuit is simple in circuit and low in energy consumption; because a switching network is not needed to gate a certain single battery in a time-sharing way, real-time synchronous measurement is realized; when the battery is charged and discharged normally, the voltage of the battery is changed in only one interval, the voltage reference chip U1 is adopted, a reasonable voltage reference is selected, data of voltage variation of the battery Bn can be extracted, and the data are amplified and then transmitted to the AD conversion circuit.
Drawings
Fig. 1 is a circuit diagram of an embodiment of the present invention;
FIG. 2 is a circuit diagram of a second embodiment of the present invention;
fig. 3 is a circuit diagram of the third embodiment of the present invention;
fig. 4 is a four-circuit diagram according to an embodiment of the present invention.
In the figure: 1. a series battery pack; 2. a measuring unit; 3. and an analog-to-digital conversion unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, a real-time measurement circuit for cell voltages in a series battery pack includes a series battery pack 1, a measurement unit 2 and an analog-to-digital conversion unit 3, where the series battery pack 1 includes a cell Bx, a cell Bn and a cell Ba, the measurement unit 2 includes an operational amplifier OPx, an operational amplifier OP1, an operational amplifier OPa, a voltage reference chip Ux1, a voltage reference chip U1, a voltage reference chip Ua1, a resistor Rx1, a resistor R1, a resistor Ra1, a resistor Rx2, a resistor R2, a resistor Ra2, a resistor Rx3, a resistor R3, a resistor Ra3, a resistor Rx4, a resistor R4, a resistor Ra4, a resistor Rx5, a resistor R5, a resistor Ra5, a resistor R6, a resistor R6, a resistor Ra6, a resistor Rx7, a resistor R7 and a resistor Ra7, and the analog-to-digital conversion unit 3 includes a voltage input terminal Sn, a voltage input terminal S2 and a voltage 1; wherein the content of the first and second substances,
the positive terminal of the battery Bx is connected with the positive terminal of the operational amplifier OPx after being connected with the resistor Rx1 in series, the input end of the voltage reference chip Ux1 is connected with the positive/negative electrode end of the battery Bx, the output end of the voltage reference chip Ux1 is connected with the negative electrode of the input end of the operational amplifier OPx after being connected with the resistor Rx3 in series, two electrodes of the resistor Rx2 are respectively connected with the positive electrode of the input end of the operational amplifier OPx and the ground end, the two electrodes of the resistor Rx4 are respectively connected with the negative electrode of the input end of the operational amplifier OPx and the ground terminal, two electrodes of the resistor Rx5 are respectively connected with the negative electrode of the input end of the operational amplifier OPx, the series resistor Rx6 and the resistor Rx7, the resistor Rx6 and the resistor Rx7 are connected to the output end of the operational amplifier OPx, the positive power supply terminal of the operational amplifier OPx is connected to a power supply Vcc, the negative power supply terminal of the operational amplifier OPx is connected to the ground terminal, and the output end of the operational amplifier OPx is connected to the voltage input end Sn;
the positive terminal of the battery Bn is connected with the positive terminal of the operational amplifier OP1 after being connected with the resistor R1 in series, the input end of the voltage reference chip U1 is connected with the positive/negative electrode end of the battery Bn, the output end of the voltage reference chip U1 is connected with the negative electrode of the input end of the operational amplifier OP1 after being connected with the resistor R3 in series, two poles of the resistor R2 are respectively connected with the positive electrode of the input end of the operational amplifier OP1 and the grounding end, two poles of the resistor R4 are respectively connected with the negative pole of the input end of the operational amplifier OP1 and the grounding end, two poles of the resistor R5 are respectively connected with the negative electrode of the input end of the operational amplifier OP1, the series resistor R6 and the resistor R7, the resistor R6 and the resistor R7 are connected to the output end of the operational amplifier OP1, the positive power supply end of the operational amplifier OPx1 is connected with a power supply Vcc, the negative power supply end of the operational amplifier OP1 is connected with the ground end, and the output end of the operational amplifier OP1 is connected with a voltage input end S2;
the positive terminal of the battery Ba is connected with the positive terminal of the input end of the operational amplifier OPa after being connected with the resistor Ra1 in series, the input end of the voltage reference chip Ua1 is connected with the positive/negative electrode end of the battery Ba, the output end of the voltage reference chip Ua1 is connected with the negative electrode of the input end of the operational amplifier OPa after being connected with the resistor Ra3 in series, two electrodes of the resistor Ra2 are respectively connected with the positive electrode of the input end of the operational amplifier OPa and the grounding end, two poles of the resistor Ra4 are respectively connected with the negative pole of the input end of the operational amplifier OPa and the grounding end, two poles of the resistor Ra5 are respectively connected with the negative electrode of the input end of the operational amplifier OPa, the series resistor Ra6 and the resistor Ra7, the resistor Ra6 and the resistor Ra7 are connected to the output end of the operational amplifier OPa, the positive power supply end of the operational amplifier OPa is connected with the power supply Vcc, the negative power supply end of the operational amplifier OPa is connected with the ground end, and the output end of the operational amplifier OPa is connected with the voltage input end S1.
Example two:
referring to fig. 2, a real-time measurement circuit for cell voltages in a series battery pack includes a series battery pack 1, a measurement unit 2 and an analog-to-digital conversion unit 3, where the series battery pack 1 includes a battery Bx, a battery Bn and a battery Ba, the measurement unit 2 includes an operational amplifier OPx, an operational amplifier OP1, an operational amplifier OPa, a voltage reference chip Ux1, a voltage reference chip U1, a voltage reference chip Ua1, a resistor Rx1, a resistor R1, a resistor Ra1, a resistor Rx2, a resistor R2, a resistor Ra2, a resistor Rx3, a resistor R3, a resistor Ra3, a resistor Rx4, a resistor R4, a resistor Ra4, a resistor Rx5, a resistor R5 and a resistor Ra5, and the analog-to-digital conversion unit 3 includes a voltage input terminal Sn, a voltage input terminal S2 and a voltage input terminal S1; wherein the content of the first and second substances,
the positive terminal of the battery Bx is connected with the positive terminal of the resistor Rx1 in series and then connected with the positive terminal of the input terminal of the operational amplifier OPx, the input terminal of the voltage reference chip Ux1 is connected with the positive/negative terminal of the battery Bx, the output terminal of the voltage reference chip Ux1 is connected with the negative terminal of the input terminal of the operational amplifier OPx in series and then connected with the negative terminal of the input terminal of the operational amplifier OPx, the two poles of the resistor Rx2 are connected with the positive terminal and the ground terminal of the input terminal of the operational amplifier OPx, the two poles of the resistor Rx4 are connected with the negative terminal and the ground terminal of the input terminal of the operational amplifier OPx, the two poles of the resistor Rx5 are connected with the negative terminal of the input terminal of the operational amplifier OPx and the output terminal of the;
the positive terminal of the battery Bn is connected with the positive electrode of the operational amplifier OP1 after being connected with the resistor R1 in series, the input terminal of the voltage reference chip U1 is connected with the positive/negative terminal of the battery Bn, the output terminal of the voltage reference chip U1 is connected with the resistor R3 in series and then connected with the negative electrode of the input terminal of the operational amplifier OP1, the two electrodes of the resistor R2 are respectively connected with the positive electrode and the ground terminal of the input terminal of the operational amplifier OP1, the two electrodes of the resistor R4 are respectively connected with the negative electrode and the ground terminal of the input terminal of the operational amplifier OP1, the two electrodes of the resistor R5 are respectively connected with the negative electrode of the input terminal of the operational amplifier OP1 and the output terminal of the operational amplifier OP1, the positive power terminal of the operational amplifier OPx 1;
the positive terminal of the battery Ba is connected with the positive terminal of the input end of the operational amplifier OPa after being connected with the resistor Ra1 in series, the input end of the voltage reference chip Ua1 is connected with the positive/negative terminal of the battery Ba, the output end of the voltage reference chip Ua1 is connected with the resistor Ra3 in series and then connected with the negative terminal of the input end of the operational amplifier OPa, two poles of the resistor Ra2 are respectively connected with the positive terminal and the grounding terminal of the input end of the operational amplifier OPa, two poles of the resistor Ra4 are respectively connected with the negative terminal and the grounding terminal of the input end of the operational amplifier OPa, two poles of the resistor Ra5 are respectively connected with the negative terminal and the output end of the operational amplifier OPa, the positive terminal of the power supply of the operational amplifier OPa is connected with the.
Example three:
referring to fig. 3, a real-time measurement circuit for cell voltages in a series battery pack includes a series battery pack 1, a measurement unit 2 and an analog-to-digital conversion unit 3, where the series battery pack 1 includes a cell Bx, a cell Bn and a cell Ba, the measurement unit 2 includes an operational amplifier OPx, an operational amplifier OP1, an operational amplifier OPa, a voltage reference chip Ux1, a voltage reference chip U1, a voltage reference chip Ua1, a switch SWx, a switch SW1, a switch SWa, a switch SWvcc, a resistor Rx1, a resistor R1, a resistor Ra1, a resistor Rx2, a resistor R2, a resistor Ra2, a resistor Rx3, a resistor R3, a resistor Ra3, a resistor R3, a resistor Rx3, a resistor Ra3, a resistor Rx3, a resistor R3, a voltage conversion unit includes an input terminal for voltage S and a voltage S36; wherein the content of the first and second substances,
the positive terminal of the battery Bx is connected in series with the switch SWx and the resistor Rx1, and then connected to the positive terminal of the input terminal of the operational amplifier OPx, the input terminal of the voltage reference chip Ux1 is connected to the positive/negative terminal of the battery Bx, the output terminal of the voltage reference chip Ux1 is connected in series with the resistor Rx3, and then connected to the negative terminal of the input terminal of the operational amplifier OPx, the two electrodes of the resistor Rx2 are respectively connected to the positive terminal and the ground terminal of the input terminal of the operational amplifier OPx, the two electrodes of the resistor Rx4 are respectively connected to the negative terminal and the ground terminal of the input terminal of the operational amplifier OPx, the two electrodes of the resistor Rx5 are respectively connected to, the resistor Rx7 is connected to the output end of the operational amplifier OPx, the power supply Vcc is connected after the power supply positive end of the operational amplifier OPx is connected with the switch SWvcc, the power supply negative end of the operational amplifier OPx is connected with the ground end, and the output end of the operational amplifier OPx is connected with the voltage input end Sn;
the positive terminal of the battery Bn is connected with the switch SW1 and the resistor R1 in series, and then is connected with the positive terminal of the input end of the operational amplifier OP1, the input end of the voltage reference chip U1 is connected with the positive/negative terminal of the battery Bn, the output end of the voltage reference chip U1 is connected with the resistor R3 in series and then is connected with the negative terminal of the input end of the operational amplifier OP1, two poles of the resistor R2 are respectively connected with the positive terminal and the ground terminal of the input end of the operational amplifier OP1, two poles of the resistor R4 are respectively connected with the negative terminal and the ground terminal of the input end of the operational amplifier OP1, two poles of the resistor R5 are respectively connected with the negative terminal of the input end of the operational amplifier OP1, and connected with the resistor R6 and the resistor R7 in series, the resistor R6 and the resistor R7 are connected with the output end of the operational;
the positive terminal of the battery Ba is connected in series with the switch SWa and the resistor Ra1 and then connected to the positive terminal of the input terminal of the operational amplifier OPa, the input terminal of the voltage reference chip Ua1 is connected to the positive/negative terminal of the battery Ba, the output terminal of the voltage reference chip Ua1 is connected in series with the resistor Ra3 and then connected to the negative terminal of the input terminal of the operational amplifier OPa, two poles of the resistor Ra2 are respectively connected to the positive terminal and the ground terminal of the input terminal of the operational amplifier OPa, two poles of the resistor Ra4 are respectively connected to the negative terminal and the ground terminal of the input terminal of the operational amplifier OPa, two poles of the resistor Ra5 are respectively connected to the negative terminal and the series resistor Ra6, the resistor Ra7, the resistor Ra6 and the resistor Ra7 are connected to the output terminal of the operational amplifier OPa, the power supply of the operational amplifier OPa is connected to.
Example four:
referring to fig. 4, a real-time measurement circuit for cell voltages in a series battery pack includes a series battery pack 1, a measurement unit 2 and an analog-to-digital conversion unit 3, where the series battery pack 1 includes a battery Bx, a battery Bn and a battery Ba, the measurement unit 2 includes an operational amplifier OPx, an operational amplifier OP1, an operational amplifier OPa, a resistor Rx1, a resistor R1, a resistor Ra1, a resistor Rx2, a resistor R2, a resistor Ra2, a resistor Rx3, a resistor R3, a resistor Ra3, a resistor Rx4, a resistor R4, a resistor Ra4, a resistor Rx5, a resistor R5, a resistor Ra5, a resistor Rx6, a resistor R6, a resistor Ra6, a resistor Rx7, a resistor R7 and a resistor Ra7, and the analog-to-digital conversion unit 3 includes a voltage input terminal Sn, a voltage input terminal S2 and a voltage input terminal S1; wherein the content of the first and second substances,
the positive terminal of the battery Bx is connected with the positive terminal of the operational amplifier OPx after being connected with the resistor Rx1 in series, the negative terminal of the battery Bx is connected with the positive terminal of the input end of the operational amplifier OPx after being connected with the resistor Rx3 in series, the negative terminal of the input end of the operational amplifier OPx, the two poles of the resistor Rx2 are connected with the positive terminal and the ground terminal of the input end of the operational amplifier OPx respectively, the two poles of the resistor Rx4 are connected with the negative terminal and the ground terminal of the input end of the operational amplifier OPx respectively, the two poles of the resistor Rx5 are connected with the negative terminal and the series resistor Rx6 and the resistor Rx7 respectively, the resistor Rx6 and the resistor Rx7 are connected with the output end of the operational amplifier OPx, the positive power supply terminal of;
the positive terminal of the battery Bn is connected with the positive terminal of the input end of the operational amplifier OP1 after being connected with the resistor R1 in series, the negative terminal of the battery Bn is connected with the negative terminal of the input end of the operational amplifier OP1 after being connected with the resistor R3 in series, two poles of the resistor R2 are respectively connected with the positive terminal and the grounding terminal of the input end of the operational amplifier OP1, two poles of the resistor R4 are respectively connected with the negative terminal and the grounding terminal of the input end of the operational amplifier OP1, two poles of the resistor R5 are respectively connected with the negative terminal of the input end of the operational amplifier OP1 and connected with the resistor R6 and the resistor R7 in series, the resistor R6 and the resistor R7 are connected with the output end of the operational amplifier OP1, the positive terminal of the power supply of the operational;
the positive terminal of the battery Ba is connected in series with the resistor Ra1 and then connected to the positive terminal of the input end of the operational amplifier OPa, the negative terminal of the battery Ba is connected in series with the resistor Ra3 and then connected to the negative terminal of the input end of the operational amplifier OPa, two poles of the resistor Ra2 are connected to the positive terminal of the input end of the operational amplifier OPa and the ground terminal respectively, two poles of the resistor Ra4 are connected to the negative terminal of the input end of the operational amplifier OPa and the ground terminal respectively, two poles of the resistor Ra5 are connected to the negative terminal of the input end of the operational amplifier OPa and the series resistor Ra6 and the resistor Ra7, the resistor Ra6 and the resistor Ra7 are connected to the output end of the operational amplifier OPa, the positive terminal of the power supply of the operational amplifier OPa.
The real-time measuring circuit for the voltage of the single battery in the series battery pack adopts a single integrated operational amplifier to finish voltage measurement and amplification, and compared with the prior art, the real-time measuring circuit is simple in circuit and low in energy consumption; because a switching network is not needed to gate a certain single battery in a time-sharing way, real-time synchronous measurement is realized; when the battery is charged and discharged normally, the voltage of the battery is changed in only one interval, the voltage reference chip U1 is adopted, a reasonable voltage reference is selected, data of voltage variation of the battery Bn can be extracted, and the data are amplified and then transmitted to the AD conversion circuit.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a real-time measurement circuit of cell voltage in series battery group, includes series battery group (1), measuring element (2) and analog-to-digital conversion unit (3), its characterized in that: the series battery pack (1) includes a battery Bx, a battery Bn and a battery Ba, the measuring unit (2) includes an operational amplifier OPx, an operational amplifier OP1, an operational amplifier OPa, a voltage reference chip Ux1, a voltage reference chip U1, a voltage reference chip Ua1, a resistor Rx1, a resistor R1, a resistor Ra1, a resistor Rx2, a resistor R2, a resistor Ra2, a resistor Rx3, a resistor R3, a resistor Ra3, a resistor Rx4, a resistor R4, a resistor Ra4, a resistor Rx5, a resistor R5, a resistor Ra5, a resistor Rx6, a resistor R6, a resistor Ra6, a resistor Rx7, a resistor R7 and a resistor Ra7, and the analog-to-digital conversion unit (3) includes a voltage Sn input terminal, a voltage S2 and a voltage S1 input terminals.
2. The circuit of claim 1 for real-time measurement of cell voltages in a series battery, wherein: the positive terminal of the battery Bx is connected with the positive terminal of the operational amplifier OPx after being connected with the resistor Rx1 in series, the input end of the voltage reference chip Ux1 is connected with the positive/negative electrode end of the battery Bx, the output end of the voltage reference chip Ux1 is connected with the negative electrode of the input end of the operational amplifier OPx after being connected with the resistor Rx3 in series, two electrodes of the resistor Rx2 are respectively connected with the positive electrode of the input end of the operational amplifier OPx and the ground end, the two electrodes of the resistor Rx4 are respectively connected with the negative electrode of the input end of the operational amplifier OPx and the ground terminal, two electrodes of the resistor Rx5 are respectively connected with the negative electrode of the input end of the operational amplifier OPx, the series resistor Rx6 and the resistor Rx7, the resistor Rx6 and the resistor Rx7 are connected to the output end of the operational amplifier OPx, the positive power supply terminal of the operational amplifier OPx is connected to a power supply Vcc, the negative power supply terminal of the operational amplifier OPx is connected to the ground terminal, and the output end of the operational amplifier OPx is connected to the voltage input end Sn.
3. The circuit of claim 1 for real-time measurement of cell voltages in a series battery, wherein: the positive terminal of the battery Bn is connected with the positive terminal of the operational amplifier OP1 after being connected with the resistor R1 in series, the input end of the voltage reference chip U1 is connected with the positive/negative electrode end of the battery Bn, the output end of the voltage reference chip U1 is connected with the negative electrode of the input end of the operational amplifier OP1 after being connected with the resistor R3 in series, two poles of the resistor R2 are respectively connected with the positive electrode of the input end of the operational amplifier OP1 and the grounding end, two poles of the resistor R4 are respectively connected with the negative pole of the input end of the operational amplifier OP1 and the grounding end, two poles of the resistor R5 are respectively connected with the negative electrode of the input end of the operational amplifier OP1, the series resistor R6 and the resistor R7, the resistor R6 and the resistor R7 are connected to the output end of the operational amplifier OP1, the positive power supply end of the operational amplifier OPx1 is connected with a power supply Vcc, the negative power supply end of the operational amplifier OP1 is connected with the ground end, and the output end of the operational amplifier OP1 is connected with the voltage input end S2.
4. The circuit of claim 1 for real-time measurement of cell voltages in a series battery, wherein: the positive terminal of the battery Ba is connected with the positive terminal of the input end of the operational amplifier OPa after being connected with the resistor Ra1 in series, the input end of the voltage reference chip Ua1 is connected with the positive/negative electrode end of the battery Ba, the output end of the voltage reference chip Ua1 is connected with the negative electrode of the input end of the operational amplifier OPa after being connected with the resistor Ra3 in series, two electrodes of the resistor Ra2 are respectively connected with the positive electrode of the input end of the operational amplifier OPa and the grounding end, two poles of the resistor Ra4 are respectively connected with the negative pole of the input end of the operational amplifier OPa and the grounding end, two poles of the resistor Ra5 are respectively connected with the negative electrode of the input end of the operational amplifier OPa, the series resistor Ra6 and the resistor Ra7, the resistor Ra6 and the resistor Ra7 are connected to the output end of the operational amplifier OPa, the positive power supply end of the operational amplifier OPa is connected with the power supply Vcc, the negative power supply end of the operational amplifier OPa is connected with the ground end, and the output end of the operational amplifier OPa is connected with the voltage input end S1.
CN201922271561.6U 2019-12-18 2019-12-18 Real-time measurement circuit for voltage of single battery in series battery pack Expired - Fee Related CN211554253U (en)

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CN113466732A (en) * 2021-06-28 2021-10-01 广西电网有限责任公司贵港供电局 Battery measuring circuit and battery measuring instrument

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* Cited by examiner, † Cited by third party
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CN113466732A (en) * 2021-06-28 2021-10-01 广西电网有限责任公司贵港供电局 Battery measuring circuit and battery measuring instrument

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