CN116786466A - Insulation resistance measuring device and method for preliminary recovery sorting of lithium battery - Google Patents
Insulation resistance measuring device and method for preliminary recovery sorting of lithium battery Download PDFInfo
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- CN116786466A CN116786466A CN202310914041.0A CN202310914041A CN116786466A CN 116786466 A CN116786466 A CN 116786466A CN 202310914041 A CN202310914041 A CN 202310914041A CN 116786466 A CN116786466 A CN 116786466A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 89
- 238000009413 insulation Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000011084 recovery Methods 0.000 title claims abstract description 22
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 235000010650 Hyssopus officinalis Nutrition 0.000 claims description 10
- 240000001812 Hyssopus officinalis Species 0.000 claims description 10
- 101100219315 Arabidopsis thaliana CYP83A1 gene Proteins 0.000 claims description 7
- 101000806846 Homo sapiens DNA-(apurinic or apyrimidinic site) endonuclease Proteins 0.000 claims description 7
- 101000835083 Homo sapiens Tissue factor pathway inhibitor 2 Proteins 0.000 claims description 7
- 101100269674 Mus musculus Alyref2 gene Proteins 0.000 claims description 7
- 101100140580 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) REF2 gene Proteins 0.000 claims description 7
- 102100026134 Tissue factor pathway inhibitor 2 Human genes 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 4
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000000691 measurement method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
- B07C5/362—Separating or distributor mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/54—Reclaiming serviceable parts of waste accumulators
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model provides an insulation resistance measuring device and method for preliminary recovery and sorting of lithium batteries. The insulation resistance measuring device comprises a microcontroller, a control module and a calculation module, wherein the microcontroller is provided with at least three ADC modules; and the insulation resistance measuring circuit comprises a first operational amplifier module, a second operational amplifier module and a voltage acquisition module which are respectively corresponding to the three ADC modules, wherein the first operational amplifier module comprises a first operational amplifier, a first current limiting resistor, a first feedback resistor and a first switch, the second operational amplifier module comprises a second operational amplifier, a second current limiting resistor, a second feedback resistor and a second switch, the voltage acquisition module is provided with a third operational amplifier configured to measure the voltage of the lithium battery, the control module is configured to control the first switch and the second switch to be in an on state or an off state respectively, and the calculation module calculates to obtain the positive insulation resistance and the negative insulation resistance R of the lithium battery to the shell ground based on kirchhoff current law.
Description
Technical Field
The utility model belongs to the technical field of lithium battery insulation resistance measurement, and particularly relates to an insulation resistance measurement device and method for preliminary recovery sorting of lithium batteries.
Background
The equipment with the largest lithium battery usage amount is an electric automobile, along with the gradual arrival of the service life of the first batch of electric automobiles, a large number of automobile lithium battery packs face retirement and scrapping treatment, the number is in the unit of ten thousands of tons, and the large number of lithium batteries are obviously unsuitable to be directly treated according to scrapping procedures and processes, because not all batteries in the retired or scrapped battery packs are in scrapped states, due to inconsistency reasons, only batteries of individual units are scrapped generally, many batteries in the packs are still in good life cycle, still have higher gradient utilization value, and waste heat can be continuously exerted through a proper gradient utilization scheme.
The first step of lithium battery echelon utilization is preliminary sorting of battery packs, and through parameter measurement, the health condition of the lithium batteries is briefly estimated and is subjected to subsequent stage recovery treatment. Insulation resistance measurement is an important parameter for evaluating the quality of a battery pack, and quick and preliminary sorting of the battery pack is a feasible scheme by measuring the insulation resistance.
At present, the insulation resistance is measured mainly by a high-voltage injection method, a bridge method and a parallel resistance method. When the high-voltage injection method is used for measuring the insulation resistance of the battery pack, the battery power supply quality can be affected, the safety is poor, and the distributed capacitance of the battery pack can cause electric leakage to cause inaccurate measurement. The bridge method has high requirements on circuit precision and relatively high cost. The parallel resistance method solves the equivalent battery pack insulation resistance according to kirchhoff's law by combining different resistance branches between the positive electrode and the negative electrode of the battery output and the ground, and is a balanced scheme in circuit cost, safety and circuit precision. For example, chinese patent No. CN206788249U proposes an insulation resistance measuring device for a dc high voltage system of an electric vehicle, which can accurately locate the position of a battery pack fault monomer; however, the scheme is mainly used for on-line monitoring of the battery state in the running process of the electric automobile, the algorithm complexity is high, and the cost of the used digital isolator and the cost of the analog-to-digital converter are high.
Disclosure of Invention
The present utility model has been made to solve the above problems, and an object of the present utility model is to provide an insulation resistance measuring apparatus and method for preliminary recovery sorting of lithium batteries.
According to the preliminary sorting requirement of the lithium battery recycling field, only the size of the insulation resistance needs to be measured, and the accurate fault position does not need to be positioned. According to the utility model, only the operational amplifier and the microprocessor chip are used, so that the insulation resistance of the lithium battery to the shell ground can be measured, a high-precision result is ensured, and the cost is lower.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
< protocol one >
The utility model provides an insulation resistance measuring device for preliminary recovery sorting of lithium batteries, which is used for measuring insulation resistance of the lithium batteries to the shell ground and has the characteristics that: the microcontroller is provided with at least three ADC modules, a control module and a calculation module; and an insulation resistance measuring circuit comprising a first operational amplifier module, a second operational amplifier module and a voltage acquisition module which are respectively corresponding to the three ADC modules, wherein the first operational amplifier module comprises a first operational amplifier Amp 1 A first current limiting resistor R S1 A first feedback resistor R FB1 A first switch S 1 First operational amplifier Amp 1 Is passed through a first current-limiting resistor R S1 The positive electrode input end of the lithium battery is grounded through a first reference voltage source, the output end of the lithium battery is connected with the corresponding ADC module as a first ADC module, and a first feedback resistor R FB1 Respectively with the first operational amplifier Amp 1 The negative input end and the output end of the first switch S1 are connected, the first current-limiting resistor R is arranged S1 And a first operational amplifier Amp 1 The second operational amplifier module comprises a second operational amplifier Amp between the negative input terminals 2 A second current limiting resistor R S2 A second feedback resistor R FB2 And a second switch S 2 Second operational amplifier Amp 2 The negative input end of (2) passes through a second current-limiting resistor R S2 The positive electrode input end is grounded through a second reference voltage source, the output end is connected with the corresponding ADC module as a second ADC module, and a second feedback resistor R FB2 Respectively with the two ends of the second operational amplifier Amp 2 A second switch S connected to the negative input terminal and the output terminal 2 Is arranged at the second current limiting resistor R S2 And a second operational amplifier Amp 2 The voltage acquisition module has a third operational amplifier configured for measuring the voltage of the lithium battery, the third operational amplifier being connected with the corresponding ADC module as a third ADC module, the control module being configured for controlling the first switch S 1 And a second switch S 2 To an on-state or an off-state respectively, when the first switch S 1 Turn on but second switch S 2 In the off state, the third ADC module acquires the current voltage of the lithium battery as V BATT1 The first ADC module measures a first operational amplifier Amp 1 Output voltage V of (2) OUTP When the first switch S 1 Open but second switch S 2 When in a conducting state, the third ADC module collects the current voltage of the lithium battery as V BATT2 The second ADC module measures a second operational amplifier Amp 2 Output voltage V of (2) OUTN Calculation moduleBased on kirchhoff's current law, according to V OUTP And V OUTN Respectively calculating to obtain the positive terminal voltage V of the lithium battery POS And a negative terminal voltage V NEG Then based on the measured V BATT1 And V BATT2 Calculated V POS And V NEG Calculating to obtain the positive insulation resistance R of the lithium battery to the shell ground ISOP And a negative electrode insulation resistance R ISON 。
The insulation resistance measuring device for preliminary recovery sorting of lithium batteries provided by the utility model can be further characterized by comprising the following steps: the microcontroller is an STM32G07RBT6 type high-precision microcontroller.
The insulation resistance measuring device for preliminary recovery sorting of lithium batteries provided by the utility model can be further characterized by comprising the following steps: wherein the microcontroller also has a DAC module for providing a voltage V of the first reference voltage source REF1 And the voltage V of the second reference voltage source REF2 Are output by the DAC module.
The insulation resistance measuring device for preliminary recovery sorting of lithium batteries provided by the utility model can be further characterized by comprising the following steps: wherein, a first current limiting resistor R S1 A first feedback resistor R FB1 A second current limiting resistor R S2 A second feedback resistor R FB2 All are low temperature drift resistors.
< protocol two >
The utility model also provides an insulation resistance measuring method for preliminary recovery sorting of lithium batteries, which uses the insulation resistance measuring device for preliminary recovery sorting of lithium batteries in the scheme I for measuring the insulation resistance of the lithium batteries to the shell ground, and has the characteristics that the method comprises the following steps:
step S1, the control module controls the first switch S 1 And a second switch S 2 The voltage of the output end of the operational amplifier is equal to the voltage of the reference voltage source, and the first ADC module acquires the voltage V of the first reference voltage source REF1 The second ADC module collects the voltage V of the second reference source REF2 And take the average value of the two as V REF ；
Step S2, the control module controls the first switch S 1 Conduction and second switch S 2 The third ADC module is disconnected, and the current voltage of the lithium battery is collected as V BATT1 According to kirchhoff's current law, the algebraic sum of currents flowing into the positive terminal node of the lithium battery is 0, namely:
the first ADC module collects a first operational amplifier Amp 1 As V OUTP According to kirchhoff's current law, flows into a first operational amplifier Amp 1 The algebraic sum of the currents at the nodes is 0, namely:
thus, the positive electrode voltage V of the lithium battery can be solved POS ：
Step S3, the control module controls the first switch S 1 Opening and second switch S 2 Conducting, and collecting the current voltage of the lithium battery as V by a third ADC module BATT2 According to kirchhoff's current law, the algebraic sum of currents flowing into the negative terminal node of the lithium battery is 0, namely:
the second ADC module collects a second operational amplifier Amp 2 As V OUTN According to kirchhoff's current law, flows into a second operational amplifier Amp 2 The algebraic sum of the currents at the nodes is 0, namely:
thus, the negative electrode voltage V of the lithium battery can be solved NEG ：
Step S4, synthesizing the formulas (1) and (4) to obtain the following equation set:
thus, the positive insulation resistance R of the lithium battery to the case ground can be solved ISOP And a negative electrode insulation resistance R ISON The method comprises the following steps:
step S5, the calculation module firstly calculates the V according to the measured V OUTP And formula (3), and measured V OUTN And formula (6) respectively calculating to obtain the positive voltage V of the lithium battery POS And a negative electrode voltage V NEG Then, based on the measured V BATT1 And V BATT2 Calculated V POS And V NEG And (8) calculating to obtain the positive insulation resistance R of the lithium battery to the shell ground ISOP And a negative electrode insulation resistance R ISON 。
Compared with the prior art, the utility model has the advantages that: according to the utility model, different resistors are connected in parallel between the anode and the cathode of the lithium battery and the ground, different circuits are controlled by the microprocessor to be switched, the voltage value of the relevant node is measured, and finally the measurement of the equivalent insulation resistance of the lithium battery is realized through a circuit law, so that the method for measuring the insulation resistance of the battery pack without using high-voltage output is realized, and the error in the insulation resistance range of 10-100000 ohm is less than 5%.
Drawings
FIG. 1 is a schematic view showing the construction of an insulation resistance measuring device for primary recovery sorting of lithium batteries according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an insulation resistance measurement circuit in an embodiment of the utility model;
FIG. 3 is an equivalent schematic diagram of an insulation resistance measurement circuit in a state where both S1 and S2 are open in an embodiment of the utility model;
FIG. 4 is an embodiment of the utility model in which the insulation resistance measuring circuit is at S 1 Turned on but S 2 An equivalent schematic diagram in the disconnected state;
FIG. 5 is an embodiment of the utility model in which the insulation resistance measuring circuit is at S 1 Disconnect but S 2 An equivalent schematic diagram in the on state; and
fig. 6 is an operational flow diagram of an insulation resistance measurement method for primary recovery sorting of lithium batteries in an embodiment of the utility model.
Detailed Description
In order to make the technical means, the creation features, the achievement of the purpose and the effect of the present utility model easy to understand, the present utility model is specifically described below with reference to the embodiments and the drawings.
Fig. 1 is a schematic structural view of an insulation resistance measuring device for primary recovery sorting of lithium batteries in an embodiment of the present utility model.
As shown in fig. 1, in the present embodiment, an insulation resistance measuring device 100 for preliminary recovery sorting of lithium batteries is used for measuring insulation resistance of a lithium battery 200 to a case ground; lithium battery 200 is shown as an ideal voltage source VBATT, with the voltage at the positive terminal of the battery being V POS The voltage of the negative terminal of the battery is V NEG It has a certain insulation resistance to the case (Chassis) ground, wherein the insulation resistance of the battery positive electrode to the case ground is R ISOP R for insulation resistance of battery negative electrode to case ground ISON And (3) representing. . The insulation resistance measuring device 100 includes a microcontroller 10 and an insulation resistance measuring circuit 20.
As shown in fig. 1, the microcontroller 10 is an STM32G07RBT6 type high-precision microcontroller, and has a first ADC module, a second ADC module, a third ADC module, a DAC module, a control module, and a calculation module.
Fig. 2 is a schematic diagram of an insulation resistance measurement circuit in an embodiment of the utility model.
As shown in fig. 1 and 2, the insulation resistance measurement circuit 20 includes a first operational amplifier module 21, a second operational amplifier module 22, and a voltage acquisition module 23.
The first operational amplifier module 21 corresponds to the first ADC module and comprises a first operational amplifier Amp 1 A first current limiting resistor R S1 A first feedback resistor R FB1 A first switch S 1 。
First operational amplifier Amp 1 Is passed through a first current-limiting resistor R S1 The positive electrode input end is grounded through a first reference voltage source, and the output end is connected with a first ADC module.
First feedback resistor R FB1 Respectively with the first operational amplifier Amp 1 Is connected with the output end.
The first switch S1 is arranged on the first current-limiting resistor R S1 And a first operational amplifier Amp 1 Is connected between the negative input terminals of the battery.
The second operational amplifier module 22 corresponds to the second ADC module and comprises a second operational amplifier Amp 2 A second current limiting resistor R S2 A second feedback resistor R FB2 And a second switch S 2 。
Second operational amplifier Amp 2 The negative input end of (2) passes through a second current-limiting resistor R S2 The positive electrode input end is grounded through a second reference voltage source, and the output end is connected with a second ADC module.
Second feedback resistor R FB2 Respectively with the two ends of the second operational amplifier Amp 2 Is connected with the output end.
Second switch S 2 Is arranged at the second current limiting resistor R S2 And a second operational amplifier Amp 2 Is connected between the negative input terminals of the battery.
In the present embodiment, a first current limiting resistor R S1 First feedback circuitR resistance FB1 A second current limiting resistor R S2 A second feedback resistor R FB2 All are low temperature drift resistors.
The voltage acquisition module 23 corresponds to a third ADC module having a third operational amplifier configured to measure the voltage of the lithium battery 200, the third operational amplifier being connected to the third ADC module.
The DAC module is connected with a first reference voltage source and a second reference voltage source respectively, and the voltage V of the first reference voltage source REF1 And the voltage V of the second reference voltage source REF2 Are output by the DAC module.
The control module is configured to control the first switch S 1 And a second switch S 2 To an off (i.e., on) state or an off state, respectively.
Fig. 3 is an equivalent schematic diagram of the insulation resistance measurement circuit in a state where both S1 and S2 are off in the embodiment of the present utility model.
As shown in FIG. 3, when the first switch S 1 And a second switch S 2 The disconnection, according to the virtual short principle of the operational amplifier, the voltage of the output end of the operational amplifier is equal to the voltage of the reference voltage source, and the first ADC module acquires 11 the voltage V of the first reference voltage source REF1 The second ADC module 12 captures a voltage V of a second reference source REF2 And take the average value of the two as V REF ；
FIG. 4 is an embodiment of the utility model in which the insulation resistance measuring circuit is at S 1 Turned on but S 2 An equivalent schematic diagram in the disconnected state.
As shown in FIG. 4, when the first switch S 1 Turn on a second switch S 2 In the off state, the third ADC module 13 collects the current voltage of the lithium battery 200 as V BATT1 The first ADC block 11 measures a first operational amplifier Amp 1 Output voltage V of (2) OUTP 。
FIG. 5 is an embodiment of the utility model in which the insulation resistance measuring circuit is at S 1 Disconnect but S 2 An equivalent schematic diagram in the on state.
As shown in fig. 5, when the first switch S 1 Open and second switch S 2 ConductionIn the state, the third ADC module 13 collects the current voltage of the lithium battery 200 as V BATT2 The second ADC module 12 measures a second operational amplifier Amp 2 Output voltage V of (2) OUTN 。
The calculation module is based on kirchhoff current law, and firstly according to V OUTP And V OUTN Respectively calculating to obtain the positive terminal voltage V of the lithium battery POS And a negative terminal voltage V NEG Then based on the measured V BATT1 And V BATT2 Calculated V POS And V NEG Calculating to obtain the positive insulation resistance R of the lithium battery to the shell ground ISOP And a negative electrode insulation resistance R ISON 。
Fig. 6 is an operational flow diagram of an insulation resistance measurement method for primary recovery sorting of lithium batteries in an embodiment of the utility model.
Correspondingly, the embodiment also provides an insulation resistance measuring method for preliminary recovery sorting of lithium batteries, which corresponds to the insulation resistance measuring device 100 for preliminary recovery sorting of lithium batteries. As shown in fig. 6, the insulation resistance measurement method includes the steps of:
step S1, the control module controls the first switch S 1 And a second switch S 2 The voltage of the output end of the operational amplifier is equal to the voltage of the reference voltage source, and the first ADC module acquires the voltage V of the first reference voltage source REF1 The second ADC module collects the voltage V of the second reference source REF2 And take the average value of the two as V REF ；
Step S2, the control module controls the first switch S 1 Conduction and second switch S 2 The third ADC module is disconnected, and the current voltage of the lithium battery is collected as V BATT1 According to kirchhoff's current law, the algebraic sum of currents flowing into the positive terminal node of the lithium battery is 0, namely:
the first ADC module collects a first operational amplifier Amp 1 As V OUTP According to kirchhoff's current law, flows into a first operational amplifier Amp 1 The algebraic sum of the currents at the nodes is 0, namely:
thus, the positive electrode voltage V of the lithium battery can be solved POS ：
Step S3, the control module controls the first switch S 1 Opening and second switch S 2 Conducting, and collecting the current voltage of the lithium battery as V by a third ADC module BATT2 According to kirchhoff's current law, the algebraic sum of currents flowing into the negative terminal node of the lithium battery is 0, namely:
the second ADC module collects a second operational amplifier Amp 2 As V OUTN According to kirchhoff's current law, flows into a second operational amplifier Amp 2 The algebraic sum of the currents at the nodes is 0, namely:
thus, the negative electrode voltage V of the lithium battery can be solved NEG ：
Step S4, synthesizing the formulas (1) and (4) to obtain the following equation set:
thus, the positive insulation resistance R of the lithium battery to the case ground can be solved ISOP And a negative electrode insulation resistance R ISON The method comprises the following steps:
step S5, the calculation module firstly calculates the V according to the measured V OUTP And formula (3), and measured V OUTN And formula (6) respectively calculating to obtain the positive voltage V of the lithium battery POS And a negative electrode voltage V NEG Then, based on the measured V BATT1 And V BATT2 Calculated V POS And V NEG And (8) calculating to obtain the positive insulation resistance R of the lithium battery to the shell ground ISOP And a negative electrode insulation resistance R ISON 。
The above embodiments are preferred examples of the present utility model, and are not intended to limit the scope of the present utility model.
Claims (5)
1. An insulation resistance measuring device for preliminary recovery letter sorting of lithium cell for measure lithium cell to the insulation resistance of shell ground, its characterized in that includes:
the microcontroller is provided with at least three ADC modules, a control module and a calculation module; and
the insulation resistance measuring circuit comprises a first operational amplifier module, a second operational amplifier module and a voltage acquisition module which are respectively corresponding to the three ADC modules,
wherein the first operational amplifier module comprises a first operational amplifier Amp 1 A first current limiting resistor R S1 A first feedback resistor R FB1 A first switch S 1 ，
The first operational amplifier Amp 1 Through the first current-limiting resistor R S1 Is connected with the positive terminal of the lithium battery, and the positive input end is connected with the lithium battery through a first reference voltage sourceThe output end is connected with the corresponding ADC module as a first ADC module,
the first feedback resistor R FB1 Respectively with the two ends of the first operational amplifier Amp 1 Is connected with the output end of the negative electrode,
the first switch S1 is arranged on the first current-limiting resistor R S1 And the first operational amplifier Amp 1 Is connected between the negative electrode input ends of the pair of the electrodes,
the second operational amplifier module comprises a second operational amplifier Amp 2 A second current limiting resistor R S2 A second feedback resistor R FB2 And a second switch S 2 ，
The second operational amplifier Amp 2 Through the second current limiting resistor R S2 Is connected with a negative terminal of the lithium battery, the positive input end is grounded through a second reference voltage source, the output end is connected with the corresponding ADC module as a second ADC module,
the second feedback resistor R FB2 Respectively with the two ends of the second operational amplifier Amp 2 Is connected with the output end of the negative electrode,
the second switch S 2 Is arranged at the second current limiting resistor R S2 And the second operational amplifier Amp 2 Is connected between the negative electrode input ends of the pair of the electrodes,
the voltage acquisition module has a third operational amplifier configured for measuring the voltage of the lithium battery, the third operational amplifier being connected with the corresponding ADC module as a third ADC module,
the control module is configured to control the first switch S 1 And the second switch S 2 To an on-state or an off-state respectively,
when the first switch S 1 Turn on but the second switch S 2 In the off state, the third ADC module acquires the current voltage of the lithium battery as V BATT1 The first ADC module measures a first operational amplifier Amp 1 Output voltage V of (2) OUTP ，
When the first switch S 1 Open but said second switch S 2 When in a conducting state, the third ADC module acquires the current voltage of the lithium battery as V BATT2 The second ADC module measures a second operational amplifier Amp 2 Output voltage V of (2) OUTN ，
The calculation module is based on kirchhoff current law, and firstly according to V OUTP And V OUTN Respectively calculating to obtain the positive terminal voltage V of the lithium battery POS And a negative terminal voltage V NEG Then based on the measured V BATT1 And V BATT2 Calculated V POS And V NEG Calculating to obtain the positive insulation resistance R of the lithium battery to the shell ground ISOP And a negative electrode insulation resistance R ISON 。
2. The insulation resistance measuring device for preliminary recycling sorting of lithium batteries according to claim 1, wherein:
the microcontroller is an STM32G07RBT6 type high-precision microcontroller.
3. The insulation resistance measuring device for preliminary recycling sorting of lithium batteries according to claim 1, wherein:
wherein the microcontroller also has a DAC module,
the voltage V of the first reference voltage source REF1 And the voltage V of the second reference voltage source REF2 Are output by the DAC module.
4. The insulation resistance measuring device for preliminary recycling sorting of lithium batteries according to claim 1, wherein:
wherein the first current limiting resistor R S1 The first feedback resistor R FB1 The second current limiting resistor R S2 And the second feedback resistor R FB2 All are low temperature drift resistors.
5. An insulation resistance measuring method for preliminary recovery sorting of lithium batteries using the insulation resistance measuring device for preliminary recovery sorting of lithium batteries according to any one of claims 1 to 4 for measuring insulation resistance of lithium batteries to a case ground, characterized by comprising the steps of:
step S1, the control module controls the first switch S 1 And the second switch S 2 The disconnection, according to the virtual short principle of the operational amplifier, the voltage of the output end of the operational amplifier is equal to the voltage of the reference voltage source, and the first ADC module collects the voltage V of the first reference voltage source REF1 The second ADC module acquires the voltage V of the second reference source REF2 And take the average value of the two as V REF ；
Step S2, the control module controls the first switch S 1 Conducting and said second switch S 2 Disconnecting, the third ADC module collects the current voltage of the lithium battery as V BATT1 According to kirchhoff's current law, the algebraic sum of currents flowing into the positive terminal node of the lithium battery is 0, namely:
the first ADC module collects the first operational amplifier Amp 1 As V OUTP According to kirchhoff's current law, flows into the first operational amplifier Amp 1 The algebraic sum of the currents at the nodes is 0, namely:
thus, the positive electrode voltage V of the lithium battery can be solved POS ：
Step S3, the control module controls the first switchS 1 Opening and said second switch S 2 Conducting, wherein the third ADC module collects the current voltage of the lithium battery as V BATT2 According to kirchhoff's current law, the algebraic sum of currents flowing into the negative terminal node of the lithium battery is 0, namely:
the second ADC module collects the second operational amplifier Amp 2 As V OUTN According to kirchhoff's current law, flows into the second operational amplifier Amp 2 The algebraic sum of the currents at the nodes is 0, namely:
thereby, the negative electrode voltage V of the lithium battery can be solved NEG ：
Step S4, synthesizing the formulas (1) and (4) to obtain the following equation set:
thus, the positive insulation resistance R of the lithium battery to the case ground can be solved ISOP And a negative electrode insulation resistance R ISON The method comprises the following steps:
step S5, the calculation module firstly calculates the V according to the measured V OUTP And formula (3), and measured V OUTN And (6) respectively calculating to obtain the positive voltage V of the lithium battery POS And a negative electrode voltage V NEG Then, based on the measured V BATT1 And V BATT2 Calculated V POS And V NEG And (8) calculating to obtain the positive insulation resistance R of the lithium battery to the shell ground ISOP And a negative electrode insulation resistance R ISON 。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118011229A (en) * | 2024-04-09 | 2024-05-10 | 无锡全裕电子科技有限公司 | Low-voltage lithium battery insulation detection circuit based on unbalanced bridge |
-
2023
- 2023-07-24 CN CN202310914041.0A patent/CN116786466A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118011229A (en) * | 2024-04-09 | 2024-05-10 | 无锡全裕电子科技有限公司 | Low-voltage lithium battery insulation detection circuit based on unbalanced bridge |
| CN118011229B (en) * | 2024-04-09 | 2024-06-04 | 无锡全裕电子科技有限公司 | Low-voltage lithium battery insulation detection circuit based on unbalanced bridge |
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