CN112485683A - Voltage sampling circuit of multi-lithium battery pack - Google Patents
Voltage sampling circuit of multi-lithium battery pack Download PDFInfo
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- CN112485683A CN112485683A CN202011299831.5A CN202011299831A CN112485683A CN 112485683 A CN112485683 A CN 112485683A CN 202011299831 A CN202011299831 A CN 202011299831A CN 112485683 A CN112485683 A CN 112485683A
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- 238000005070 sampling Methods 0.000 title claims abstract description 52
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 49
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000010586 diagram Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention discloses a voltage sampling circuit of a multi-section lithium battery pack, wherein one end of n +1 switches SC0-SCn is connected with n single batteries, and the other end of the switches SC0-SCn is connected with one ends of a resistor R1 and a resistor R2; the other end of the resistor R1 is connected with the positive input end of the operational amplifier A1 through a switch S1A, and is connected with the negative input end of the operational amplifier A1 through a switch S2A; the other end of the resistor R2 is connected with the positive input end of the operational amplifier A1 through a switch S3A, and is connected with the negative input end of the operational amplifier A1 through a switch S4A; the other end of the resistor R1 and the other end of the resistor R2 are respectively connected with one end of a resistor R3 and one end of a resistor R4; the other end of the resistor R3 is grounded through a switch S1; the other end of the resistor R3 is connected with the output end Vo through a switch S2; the other end of the resistor R4 is grounded through a switch S3; the other end of the resistor R4 is connected with the output end Vo through a switch S4; the output terminal of the operational amplifier a1 is connected to the output terminal Vo. The sampling circuit has the advantages of simple structure, low power consumption and small occupied chip area.
Description
Technical Field
The invention belongs to the field of CMOS (complementary metal oxide semiconductor) process integrated circuits, and particularly relates to a voltage sampling circuit of a multi-section lithium battery pack.
Background
Nowadays, the application of lithium battery cascade is more and more extensive, and how to protect a plurality of lithium battery packs more effectively is continuously researched and improved. For the protection of a plurality of lithium battery packs, the battery voltage sampling circuit is particularly important, and the collected battery voltage can be processed only by more effectively and accurately collecting the voltage of each battery, so that the plurality of lithium battery packs are more effectively protected.
As shown in fig. 1, a conventional multi-lithium battery pack battery voltage sampling circuit is a closed-loop amplifying circuit formed by n (n represents the number of battery pack sections) operational amplifiers, and is configured to sample the voltage of each single battery corresponding to a single battery pack and output a sampled voltage Von representing the voltage of each single battery. The scheme shown in fig. 1 is adopted to sample the voltage of the multi-lithium battery pack, and n operational amplifiers are used to work simultaneously, so that the sampling circuit is complex, larger chip area is needed, and more power consumption is consumed.
As shown in FIG. 2, another conventional multi-lithium battery voltage sampling circuit adopting a time-sharing multiplexing concept uses n switches SCN1-SCNn, one end of each switch SCN1-SCNn is connected to the negative end of each battery, the other end of each switch SCN1-SCNn is connected to one end of a resistor R1, one ends of n switches SCP1-SCPn are connected to the positive end of each battery, the other end of each switch SCP1-SCPn is connected to one end of a resistor R2, the other end of a resistor R1 is connected to the negative input end of an operational amplifier and one end of a resistor R3, the other end of R3 is connected to the output end of the operational amplifier, the other end of the resistor R2 is connected to the positive input end of the operational amplifier and one end of a resistor R4, and the other end of R4 is connected to GND. The basic working principle is as follows: the switches SCN1-SCNn and SCP1-SCPn are closed in sequence at each moment, the voltage of each battery relative to GND is obtained through a sampling circuit consisting of an operational amplifier, a resistor R1, a resistor R2, a resistor R3 and a resistor R4, and the voltage is further processed through a post-stage circuit. This configuration uses more switches on the battery pack side, the presence of which requires the consumption of more chip area.
Therefore, how to design a multi-lithium battery pack voltage sampling circuit with simple structure, low power consumption and less resource consumption is always a difficult point.
Disclosure of Invention
Based on the defects in the prior art, the invention aims to provide a voltage sampling circuit of a multi-lithium battery pack, which has a simple structure and consumes less resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a voltage sampling circuit of a multi-section lithium battery pack comprises n single batteries and n +1 switches SC 0-SCn; the system further comprises a switch S1, a switch S2, a switch S3, a switch S4, a switch S1A, a switch S2A, a switch S3A, a switch S4A, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an operational amplifier A1, wherein one end of each of the n +1 switches SC0-SCn is connected with the n single batteries, and the other end of each of the n +1 switches SC0-SCn is connected with one end of the resistor R1 and one end of the resistor R2; the other end of the resistor R1 is connected with the positive input end of the operational amplifier A1 through a switch S1A, and is connected with the negative input end of the operational amplifier A1 through a switch S2A; the other end of the resistor R2 is connected with the positive input end of the operational amplifier A1 through a switch S3A, and is connected with the negative input end of the operational amplifier A1 through a switch S4A; the other end of the resistor R1 and the other end of the resistor R2 are respectively connected with one end of a resistor R3 and one end of a resistor R4; the other end of the resistor R3 is grounded through a switch S1; the other end of the resistor R3 is connected with the output end Vo through a switch S2; the other end of the resistor R4 is grounded through a switch S3; the other end of the resistor R4 is connected with the output end Vo through a switch S4; the output terminal of the operational amplifier a1 is connected to the output terminal Vo.
The invention further improves the following steps: one end of the switch SC0 is connected with GND and the negative electrode of the first single battery CELL1, and the other end is connected with a node VA;
one end of the switch SCx is connected with the positive electrode of the xth single battery CELLx and the negative electrode of the xth +1 single battery CELLx +1, and the other end of the switch SCx is connected with a node VB;
one end of the switch SCy is connected with the anode of the y section of the single battery CELLy and the cathode of the y +1 section of the single battery CELLy +1, and the other end is connected with the node VB;
x is more than or equal to 1 and less than or equal to n, and x is an odd number; y is more than or equal to 2 and less than or equal to n, and is an even number;
the node VA is connected with one end of the resistor R2; node VB is connected to one end of resistor R1.
The invention further improves the following steps: n is an odd number, one end of an n-1 th switch SCn-1 is connected with the positive electrode of the n-1 st single battery and the negative electrode of the n-th single battery, the other end of the switch SCn-1 is connected with a node VA, one end of the n-th switch SCn is connected with the positive electrode of the n-th single battery, and the other end of the switch SCn is connected with a node VB.
The invention further improves the following steps: n is an even number, one end of the (n-1) th switch SCn-1 is connected with the positive electrode of the (n-1) th single battery and the negative electrode of the nth single battery, the other end of the switch SCn-1 is connected with a node VB, one end of the nth switch SCn is connected with the positive electrode of the nth single battery, and the other end of the switch SCn is connected with a node VA.
The invention further improves the following steps: when the voltage of the odd-numbered single lithium batteries is sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned on, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned off.
The invention further improves the following steps: when the voltage of the single lithium battery with even number of sections is sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned off, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned on at the same time.
The invention further improves the following steps: by switching the switching tubes SC0-SCn, a certain single battery in the multi-section lithium battery pack is connected with a sampling circuit consisting of the operational amplifier A1, the resistor R1, the resistor R2, the resistor R3 and the resistor R4, so that the voltage of the single battery is obtained.
The invention further improves the following steps: the resistance value of the resistor R1 is equal to that of the resistor R2, both are RIN, the resistance value of the resistor R3 is equal to that of the resistor R4, both are RF, the impedances of the switches SC0-SCn are equal, both are RSC, the impedances of the switch S1, the switch S2, the switch S3 and the switch S4 are equal, both are RSF, the voltage VB of each single battery is transmitted to an amplifying circuit consisting of the operational amplifier A1, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 through the switches SC0-SCn, the switch S1, the switch S2, the switch S3, the switch S4, the switch S1A, the switch S2A, the switch S3A and the switch S4A, and the output voltage VO obtained by the amplifying circuit is:
the invention further improves the following steps:
therefore, compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the idea of time-sharing multiplexing, only uses an amplifying circuit consisting of an operational amplifier to carry out voltage sampling, and has the characteristics of reducing the design complexity, saving the power consumption and occupying less resources.
2. The invention realizes that only n +1 switching tubes are used by switching the switches at the end of the operational amplifier, samples the voltage of the battery pack with n sections, realizes impedance matching to a certain extent and saves the area of a chip.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a conventional voltage detection circuit;
FIG. 2 is a schematic diagram of a conventional time-division multiplexing multi-lithium battery pack voltage sampling circuit;
FIG. 3 is a schematic diagram of a voltage sampling circuit for a multi-lithium battery pack according to the present invention;
FIG. 4 is a circuit for sampling the voltage of a 7-cell lithium battery pack to which the present invention is applied;
fig. 5 is an equivalent circuit diagram of voltage sampling of the first single battery in the voltage sampling circuit of the 7-cell lithium battery pack applied in the invention.
Fig. 6 is an equivalent circuit diagram of voltage sampling of a second single battery in a voltage sampling circuit of a 7-cell lithium battery pack applied in the invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
As shown in fig. 3, the multi-lithium battery pack voltage sampling circuit of the present invention is a schematic diagram of the multi-lithium battery pack voltage sampling circuit of the present invention, and the multi-lithium battery pack voltage sampling circuit of the present invention includes n single batteries and n +1 switches SC0-SCn, and further includes a switch S1, a switch S2, a switch S3, a switch S1 3, a switch S2 3, a switch S3 3, a switch S4 3, a resistor R3, and an operational amplifier A3, wherein one end of the n +1 switches SC 3-SCn is connected to the n single batteries, and the other end is connected to one end of the resistor R3 and the resistor R3, the other end of the resistor R3 and the other end of the resistor R3 are connected to one end of the switch S1 3, the switch S2 3, the switch S3 3, the other end of the switch S3 and the other end of the switch S3 are connected to the operational amplifier a switch S3, and the other end of the switch S3 is, And the switch S2 is connected with the other end of the resistor R4 through the switch S3 and the switch S4.
By controlling the on and off of the n +1 switches SC0-SCn and the switch S1, the switch S2, the switch S3, the switch S4, the switch S1A, the switch S2A, the switch S3A and the switch S4A, a specific certain lithium battery can be selected for voltage sampling.
In a specific embodiment, one end of the switch SC0 is connected to GND and the cathode of the first CELL1, the other end of the switch SC0 is connected to the node VA, one end of the switch SC1 is connected to the anode of the first CELL1 and the cathode of the second CELL2, the other end of the switch SC1 is connected to the node VB, one end of the switch SC2 is connected to the anode of the second CELL2 and the cathode of the third CELL3, the other end of the switch SC2 is connected to the node VB, one end of the switch SC3 is connected to the anode of the third CELL3 and the cathode of the fourth CELL4, the other end of the switch SC4 is connected to the anode of the fourth CELL4 and the cathode of the fifth CELL5, and the other end of the switch SC4 is connected to the node VB.
Through the mode, the switch connected with the negative electrode of each lithium battery of one lithium battery at intervals is connected to the same node, the switch connected with the positive electrode of each lithium battery of one lithium battery at intervals is connected to another node, the specific lithium battery can be selected for sampling by controlling the on-off of the switch, only one operational amplifier needs to be arranged, a plurality of operational amplifiers do not need to be arranged, devices are saved, and the area of a chip can be saved.
In a specific embodiment, if the number of the single batteries contained in the battery pack is odd, one end of an n-1 th switch SCn-1 is connected with the positive electrode of the n-1 th single battery and the negative electrode of the n-th single battery, the other end of the switch SCn-1 is connected with a node VA, one end of the n-th switch SCn is connected with the positive electrode of the n-th single battery, and the other end of the switch SCn is connected with a node VB; if the number of the single batteries in the battery pack is even, one end of an n-1 th switch SCn-1 is connected with the positive electrode of the n-1 th single battery and the negative electrode of the n-1 th single battery, the other end of the switch SCn-1 is connected with a node VB, one end of an n-th switch SCn is connected with the positive electrode of the n-th single battery, and the other end of the switch SCn is connected with the node VA.
In a specific embodiment, one end of the resistor R1 is connected to the node VB, the other end of the resistor R1 is connected to one end of the switch S1A, one end of the switch S2A and one end of the resistor R3, the other end of the switch S1A is connected to the positive input terminal of the operational amplifier a1, the other end of the switch S2A is connected to the negative input terminal of the operational amplifier a1, one end of the resistor R2 is connected to the node VA, the other end of the resistor R2 is connected to one end of the switch S3A, one end of the switch S4A and one end of the resistor R4, the other end of the switch S3A is connected to the positive input terminal of the operational amplifier a1, the other end of the switch S4A is connected to the input terminal of the operational amplifier a1, the other end of the resistor R3 is connected to one end of the switch S1 and one end of the switch S2, the other end of the resistor R4 is connected to GND, the other end of the switch S2 and the other end of the switch S4 are connected to the output terminal Vo. The anode of the lithium battery can be connected to the positive input end of the operational amplifier A1 by switching different switches, and the cathode of the lithium battery can be connected to the negative input end of the operational amplifier, so that the sampling of the voltage of the lithium battery is realized.
In a specific embodiment, when the voltage of the odd-numbered single lithium batteries is sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned on, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned off; when the voltage of the single lithium battery with even number of sections is sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned off, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned on. Likewise, the sampling of the lithium battery voltage is realized through the gating mode. By adopting the idea of time division multiplexing, at each moment, a certain single battery in the multi-section lithium battery pack is connected with a sampling circuit consisting of an operational amplifier A1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 by switching a switch tube SC0-SCn, a switch S1, a switch S2, a switch S3, a switch S4, a switch S1A, a switch S2A, a switch S3A and a switch S4A, so that the voltage Vo of each battery is obtained, the power consumption is saved, and the chip resources are reduced.
The battery pack composed of 7 lithium batteries is taken as an example for explanation, and fig. 4 shows a voltage sampling circuit of the 7 lithium battery pack, which comprises a switch SC0, a switch SC1, a switch SC2, a switch SC3, a switch SC4, a switch SC5, a switch SC6, a switch SC7, a switch S1, a switch S2, a switch S3, a switch S4, a switch S1A, a switch S2A, a switch S3A, a switch S4A, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an operational amplifier a1, wherein the connection relations of the components are shown in fig. 4.
Wherein, one end of a switch SC0 is connected with GND and the cathode of a first single battery CELL1, the other end is connected with a node VA, one end of a switch SC1 is connected with the anode of the first single battery CELL1 and the cathode of a second single battery CELL2, the other end is connected with a node VB, one end of a switch SC2 is connected with the anode of the second single battery CELL2 and the cathode of a third single battery CELL3, the other end is connected with a node VB, one end of a switch SC3 is connected with the anode of the third single battery CELL3 and the cathode of a fourth single battery CELL4, the other end is connected with the node VA, one end of a switch SC4 is connected with the anode of the fourth single battery CELL4 and the cathode of a fifth single battery CELL5, the other end is connected with a node VB, one end of a switch SC5 is connected with the anode of the fifth single battery CELL 7378 and the cathode of the sixth single battery CELL6, the other end is connected with the node VB, one end of the switch 6 is connected with the anode of the sixth single battery CELL6 and the, the other end of the switch SC7 is connected with a node VB, one end of the switch SC7 is connected with the positive electrode of the seventh single battery CELL7, and the other end of the switch SC7 is connected with the node VB. One end of the resistor R1 is connected with the node VB, the other end of the resistor R1 is connected with one end of the switch S1A, one end of the switch S2A and one end of the resistor R3, the other end of the switch S1A is connected with the positive input end of the operational amplifier, the other end of the switch S2A is connected with the negative input end of the operational amplifier, one end of the resistor R2 is connected with the node VA, the other end of the resistor R2 is connected with one end of the switch S3A, one end of the switch S4A and one end of the resistor R4 are connected together, the other end of the switch S3A is connected to the positive input end of the operational amplifier, the other end of the switch S4A is connected to the negative input end of the operational amplifier, the other end of the resistor R3 is connected to one end of the switch S1 and one end of the switch S2, the other end of the resistor R4 is connected to one end of the switch S3 and one end of the switch S4, the other end of the switch S1 and the other end of the switch S3 are connected to GND, and the other end of the switch S2 and the other end of the switch S4 are connected to the output Vo.
In the circuit, the resistance value of a resistor R1 is equal to the resistance value of a resistor R2, both are RIN, the resistance value of a resistor R3 is equal to the resistance value of a resistor R4, both are RF, the impedances of switches SC0-SC7 are equal, both are RSC, the impedances of a switch S1, a switch S2, a switch S3 and a switch S4 are equal, both are RSF, the voltage VB of each single battery is transmitted to an amplifying circuit consisting of an operational amplifier A1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4 through a switch SC0-SCn, a switch S1, a switch S2, a switch S3, a switch S4, a switch S1A, a switch S2A, a switch S3A and a switch S4A, and the output voltage VO is:
to achieve 1:1 sampling of the battery voltage, it is necessary to:
then:
VO＝VB
the impedance of the switching tube is reasonably designed, so that a battery voltage sampling value meeting the requirement can be obtained and used for subsequent circuit processing.
When the voltage of the single lithium battery with odd number of sections is sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned on, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned off. As shown in fig. 5, an equivalent circuit for sampling the voltage of the first battery cell is shown, and a sampling voltage Vo representing the voltage of the first battery cell is obtained through a sampling circuit composed of an operational amplifier and a resistor.
When the voltage of the single lithium battery with even number of sections is sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned off, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned on. As shown in fig. 6, which is an equivalent circuit diagram of voltage sampling of the second battery cell, a sampling voltage Vo representing the voltage of the second battery cell is obtained through a sampling circuit composed of an operational amplifier and a resistor.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (9)
1. A voltage sampling circuit of a multi-section lithium battery pack comprises n single batteries and n +1 switches SC 0-SCn; the battery pack is characterized by further comprising a switch S1, a switch S2, a switch S3, a switch S4, a switch S1A, a switch S2A, a switch S3A, a switch S4A, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and an operational amplifier A1, wherein one end of each of the n +1 switches SC0-SCn is connected with the n single batteries, and the other end of each of the n +1 switches SC0-SCn is connected with one end of the resistor R1 and one end of the resistor R2; the other end of the resistor R1 is connected with the positive input end of the operational amplifier A1 through a switch S1A, and is connected with the negative input end of the operational amplifier A1 through a switch S2A; the other end of the resistor R2 is connected with the positive input end of the operational amplifier A1 through a switch S3A, and is connected with the negative input end of the operational amplifier A1 through a switch S4A; the other end of the resistor R1 and the other end of the resistor R2 are respectively connected with one end of a resistor R3 and one end of a resistor R4; the other end of the resistor R3 is grounded through a switch S1; the other end of the resistor R3 is connected with the output end Vo through a switch S2; the other end of the resistor R4 is grounded through a switch S3; the other end of the resistor R4 is connected with the output end Vo through a switch S4; the output terminal of the operational amplifier a1 is connected to the output terminal Vo.
2. The voltage sampling circuit of claim 1, wherein one end of the switch SC0 is connected to GND and the negative electrode of the first CELL1, and the other end is connected to a node VA;
one end of the switch SCx is connected with the positive electrode of the xth single battery CELLx and the negative electrode of the xth +1 single battery CELLx +1, and the other end of the switch SCx is connected with a node VB;
one end of the switch SCy is connected with the anode of the y section of the single battery CELLy and the cathode of the y +1 section of the single battery CELLy +1, and the other end is connected with the node VB;
x is more than or equal to 1 and less than or equal to n, and x is an odd number; y is more than or equal to 2 and less than or equal to n, and is an even number;
the node VA is connected with one end of the resistor R2; node VB is connected to one end of resistor R1.
3. The voltage sampling circuit of claim 2, wherein n is an odd number, one end of the (n-1) th switch SCn-1 is connected to the positive electrode of the (n-1) th cell and the negative electrode of the (n) th cell, the other end of the switch SCn-1 is connected to the node VA, one end of the (n) th switch SCn is connected to the positive electrode of the (n) th cell, and the other end of the switch SCn is connected to the node VB.
4. The voltage sampling circuit of claim 2, wherein n is an even number, one end of the (n-1) th switch SCn-1 is connected to the positive electrode of the (n-1) th cell and the negative electrode of the nth cell, the other end of the switch SCn-1 is connected to the node VB, one end of the nth switch SCn is connected to the positive electrode of the nth cell, and the other end of the switch SCn is connected to the node VA.
5. The voltage sampling circuit of the multi-lithium battery pack according to claim 1, wherein when the voltages of the odd-numbered single lithium batteries are sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned on, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned off.
6. The voltage sampling circuit of the multi-lithium battery pack according to claim 1, wherein when the voltage of the single lithium batteries of even number of the lithium batteries is sampled, the switch S1, the switch S1A, the switch S4A and the switch S4 are turned off, and the switch S2, the switch S2A, the switch S3A and the switch S3 are turned on.
7. The voltage sampling circuit of claim 1, wherein a single battery in the multiple lithium battery packs is connected to the sampling circuit formed by the operational amplifier a1, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 by switching the switching tubes SC0-SCn, so as to obtain the voltage of the single battery.
8. The voltage sampling circuit of claim 1, wherein the resistance of the resistor R1 and the resistance of the resistor R2 are equal, both are RIN, the resistance of the resistor R3 and the resistance of the resistor R4 are equal, both are RF, the impedances of the switches SC0-SCn are equal, both are RSC, the impedances of the switch S1, the switch S2, the switch S3 and the switch S4 are equal, both are RSF, and the voltage VB of each cell is transmitted to the operational amplifier a1, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 through the amplifier circuit formed by the switches SC0-SCn, the switch S1, the switch S2, the switch S3, the switch S4, the switch S1A, the switch S2A, the switch S3A and the switch S4A, so as to obtain an output voltage VO:
9. the voltage sampling circuit of claim 8, wherein the voltage sampling circuit comprises a first voltage sampling circuit and a second voltage sampling circuit,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011299831.5A CN112485683A (en) | 2020-11-18 | 2020-11-18 | Voltage sampling circuit of multi-lithium battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011299831.5A CN112485683A (en) | 2020-11-18 | 2020-11-18 | Voltage sampling circuit of multi-lithium battery pack |
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