CN221124827U - Battery core insulation damage leakage current detection circuit - Google Patents
Battery core insulation damage leakage current detection circuit Download PDFInfo
- Publication number
- CN221124827U CN221124827U CN202322880266.7U CN202322880266U CN221124827U CN 221124827 U CN221124827 U CN 221124827U CN 202322880266 U CN202322880266 U CN 202322880266U CN 221124827 U CN221124827 U CN 221124827U
- Authority
- CN
- China
- Prior art keywords
- electrically connected
- resistor
- leakage current
- battery core
- insulation damage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 abstract description 25
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 208000028659 discharge Diseases 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009421 internal insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model belongs to the technical field of insulation damage detection, and relates to a battery core insulation damage leakage current detection circuit which comprises operational amplifiers IC1, IC2 and IC3, and comparators IC4 and IC5. After the sampling inductance L1 and the protection piezoresistor RV1 are connected in parallel, the sampling inductance L1 is electrically connected with the IC3 through a resistor R3, a capacitor C1 and the like, the IC1 is electrically connected with the IC2, and output ends of the IC2 and the IC3 are respectively electrically connected with the IC4 and the IC5. The output end of the IC4 is electrically connected with the input port GPIO1 of the singlechip data acquisition system, and the output end of the IC5 is electrically connected with the input port GPIO2 of the singlechip data acquisition system. The utility model uses the operational amplifier and the comparator, has simple and reasonable circuit structure, realizes the rapid detection of the insulation damage leakage current of the battery core with low cost, has faster test speed and more reliable judgment, can better meet the requirement of rapid test of the battery production line, improves the detection efficiency and saves the detection time of the production line.
Description
Technical Field
The utility model belongs to the technical field of insulation damage detection, and particularly relates to a battery core insulation damage leakage current detection circuit.
Background
The English name of the battery Cell is Cell, which means that the battery Cell is not directly used in general, and the battery Cell is an electrochemical Cell containing a positive electrode and a negative electrode. The battery core consists of a positive electrode, a diaphragm, a negative electrode and a shell, and the battery core and the protection circuit board form the secondary rechargeable battery.
With the rapid development of new energy automobiles, the demand of power batteries is rapidly increasing, and consumers pay attention to the endurance mileage of electric automobiles, and also pay very much attention to the safety problem of battery systems therein. And the potential safety hazard of the power battery can be effectively discovered in time, so that the potential safety hazard is an important requirement for guaranteeing the life safety of consumers and the sustainable development of battery enterprises.
In the production process of the battery, particularly the battery core before liquid injection, the state of insulation performance is an important test item of enterprises, and insulation resistance test methods are commonly adopted by specific test means. At present, the insulation resistance test method can effectively identify battery products with insulation defects, but is mainly effective for detection under the condition that obvious insulation failure or obvious damage to a diaphragm occurs, and has poor abnormal discharge diagnosis effect in the early stage of the insulation failure, and the early state of the insulation damage can not be discovered in advance almost. The more the testing procedure is, the higher the cost loss is, and especially the poor insulating performance of the battery core is found after the liquid injection, and the recovery cost and the environmental protection cost are greatly increased.
The battery core before liquid injection is equivalent to a capacitor structure, and has the megaohm insulation resistance and the energy storage function of a capacitor device. The insulation resistance test needs to charge high-voltage energy into the battery core, maintain output unchanged after the voltage rises to the required test voltage, then detect leakage current under the high-voltage condition, test software collects a large amount of voltage and current, calculates to obtain a current average value, generally 100mS is used as a calculation period, and obtains an insulation resistance value in the current test period of the battery core to be tested according to ohm law R=U/I, wherein the insulation resistance value can reflect the insulation performance level of the battery core to be tested. The insulation resistance test method needs longer time, the average value of current stability under high-voltage condition is needed to be obtained, the test time is generally longer than 1S, if the capacity of the battery cell is larger, the test time must be lengthened, the test method is insensitive to smaller current or voltage fluctuation, and the smaller current or voltage fluctuation indicates abnormal discharge caused by insulation defects in the battery cell. Before the test time is over, a plurality of insulation resistance values are calculated and displayed, and the final value is used as a judging basis for whether the test time is qualified or not after the test time is over. The test efficiency is not more and more satisfactory to the requirement of mass production beat of the production line, and each engineering manufacturer can only increase the number of the insulation resistance testers to compensate the influence caused by overlong test time of a single tester.
Disclosure of utility model
In order to solve the technical problems, the utility model designs a new circuit structure for rapidly detecting the insulation damage leakage current of the battery core, and the technical scheme adopted by the utility model is as follows:
The battery cell insulation damage leakage current detection circuit comprises operational amplifiers IC1, IC2 and IC3, and comparators IC4 and IC5. After the sampling inductor L1 and the protection piezoresistor RV1 are connected in parallel, one end is connected with the reference ground, the other end is electrically connected with one end of a resistor R3, the other end of the resistor R3 is electrically connected with one end of a capacitor C1, the other end of the resistor C1 is respectively electrically connected with one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R5 is electrically connected with one end of a capacitor C2, the other end of the resistor C2 is respectively electrically connected with one end of a resistor R6 and one end of a resistor R7, the other end of the resistor R6 is connected with the reference ground, the other end of the resistor R7 is electrically connected with the reverse input end of the resistor R3, the reverse input end of the resistor R3 is electrically connected with the output end of the resistor C3, and the output end of the resistor C3 is respectively electrically connected with the reverse input end of the resistor C4 and the forward input end of the resistor IC5. The reverse input end of the IC1 is electrically connected with the output end of the IC1, the output end of the IC1 is electrically connected with the forward input end of the IC4, the output end of the IC1 is electrically connected with one end of the resistor R1, the other end of the R1 is respectively electrically connected with one end of the resistor R2 and the reverse input end of the IC2, the forward input end of the IC2 is grounded, the other end of the R2 is electrically connected with the output end of the IC2, and the output end of the IC2 is electrically connected with the reverse input end of the IC5.
Preferably, the battery core to be tested is connected between the high voltage and the loop, and the loop is electrically connected with the sampling inductor L1, the other end of the protection piezoresistor RV1 and one end of the resistor R3 in parallel respectively.
Preferably, the comparator IC4 and the comparator IC5 are respectively and electrically connected with the singlechip data acquisition system.
Preferably, the current enable limit is input to the positive input of IC 1.
Preferably, the output end of the IC4 is electrically connected to the input port GPIO1 of the singlechip data acquisition system, and the output end of the IC5 is electrically connected to the input port GPIO2 of the singlechip data acquisition system.
The utility model has the beneficial effects that:
The utility model designs the battery core insulation damage leakage current detection circuit by using the operational amplifier and the comparator, has simple and reasonable circuit structure and realizes the rapid detection of the battery core insulation damage leakage current with low cost. According to the utility model, the instantaneous change state of the insulation leakage current in the test process is captured, the allowable upper limit of the change current is preset in advance, the insulation state of the battery core to be tested is judged according to the instantaneous state of the abnormal discharge current in the battery core, the insulation performance detection of the battery core can be completed at about 100mS, and failure information is provided. The test speed is faster, the judgment is more reliable, the requirement of the quick test of the battery production line can be met, the detection efficiency is improved, and the detection time of the production line is saved. The utility model can be applied to battery core insulation performance test equipment, effectively solves abnormal discharge caused by insulation damage in battery core insulation performance test, rapidly captures current change state when defects cause abnormal discharge, and provides reliable judgment standard.
Drawings
Fig. 1 is a schematic diagram of the structure and principle of a battery cell insulation damage leakage current detection circuit according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and complete in conjunction with the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the present utility model.
Referring to fig. 1, the battery cell insulation damage leakage current detection circuit includes operational amplifiers IC1, IC2, and IC3, and comparators IC4 and IC5.IC1, IC2 and IC3 may employ an operational amplifier model AD8510 and IC4 and IC5 may employ a comparator model LM 311.
The tested battery core is connected between the high voltage and the loop, and the loop is respectively and electrically connected with the sampling inductance L1, the other end of the protection piezoresistor RV1 and one end of the resistor R3 in parallel. After the sampling inductor L1 and the protection piezoresistor RV1 are connected in parallel, one end is connected with the reference ground, the other end is electrically connected with one end of a resistor R3, the other end of the resistor R3 is electrically connected with one end of a capacitor C1, the other end of the resistor C1 is respectively electrically connected with one end of a resistor R4 and one end of a resistor R5, the other end of the resistor R5 is electrically connected with one end of a capacitor C2, the other end of the resistor C2 is respectively electrically connected with one end of a resistor R6 and one end of a resistor R7, the other end of the resistor R6 is connected with the reference ground, the other end of the resistor R7 is electrically connected with the reverse input end of the resistor R3, the reverse input end of the resistor R3 is electrically connected with the output end of the resistor C3, and the output end of the resistor C3 is respectively electrically connected with the reverse input end of the resistor C4 and the forward input end of the resistor IC 5. The reverse input end of the IC1 is electrically connected with the output end of the IC1, the output end of the IC1 is electrically connected with the forward input end of the IC4, the output end of the IC1 is electrically connected with one end of the resistor R1, the other end of the R1 is respectively electrically connected with one end of the resistor R2 and the reverse input end of the IC2, the forward input end of the IC2 is grounded, the other end of the R2 is electrically connected with the output end of the IC2, and the output end of the IC2 is electrically connected with the reverse input end of the IC 5. The current enable limit is input to the non-inverting input of IC 1. The output end of the IC4 is electrically connected with the input port GPIO1 of the singlechip data acquisition system, and the output end of the IC5 is electrically connected with the input port GPIO2 of the singlechip data acquisition system. The outputs of comparators IC4 and IC5 are both connected to a common reference ground GND1.
The DAC signal is a current allowable limit value set in advance, after passing through the operational amplifier IC1, one path of signal directly enters the positive input end of the comparator IC4 to be used as a positive reference of the measured signal, and the other path of signal is input into the reverse input end of the operational amplifier IC2 through the resistor R1, and the resistors R1, R2 and the operational amplifier IC2 form a reverse amplifying circuit, where r1=r2 is taken. The output of the operational amplifier IC2 enters the reverse input end of the comparator IC5 to be used as the negative reference of the measured signal.
The battery core to be tested is connected between the high voltage and the loop, and the sampling inductance L1 and the protection piezoresistor RV1 in the detection circuit are connected in parallel and then connected in series to the loop. After the test is started, the direct-current voltage source rises the voltage to the set value level, corresponding high-voltage energy is stored in the battery core Cx, and if the battery core is well insulated, unidirectional direct-current leakage current passes through the inductor L1, and no induced electromotive force is generated. If the insulation inside the battery core is damaged, an electric flashover or arc discharge phenomenon is generated under the action of a high-voltage electric field to form a changed leakage current, after the leakage current passes through the inductor L1, the inductor L1 generates an induced electromotive force Vin signal with the same size, the Vin signal enters a next-stage resistance-capacitance network through the resistor R3 and the capacitor C1, and the resistance-capacitance network is connected in parallel with the resistor R4 after being connected in series through the resistor R5, the capacitor C2, the capacitor C3 and the resistor R6, and is connected to the ground GND1. The detection circuit is used for collecting voltage signals on a series structure of a capacitor C3 and a resistor R6, inputting the voltage signals into the reverse input end of an operational amplifier IC3 after passing through the resistor R7, and respectively inputting output signals of the operational amplifier IC3 into the reverse input end of a comparator IC4 and the forward input end of an IC 5. Because the Vin signal is a varying ac signal, it has a positive peak and a negative peak; when the positive peak value exceeds a preset limit value, the trigger comparator IC4 outputs a low level Vout1, and the Vout1 enters a GPIO1 input pin of the singlechip data acquisition system and can be captured, so that an alarm is triggered, and the insulation performance of the tested battery core is judged to be unqualified; when the negative peak value exceeds the preset limit value, the trigger comparator IC5 outputs a low level Vout2, and the Vout2 enters a GPIO2 input pin of the singlechip data acquisition system to be captured, so that an alarm is triggered, and the insulation performance of the tested battery core is judged to be unqualified.
The detection circuit completes a test period of about 10mS (related to the change period of the tested signal), generally, 10 times of accumulated detection data are needed to judge the result, if continuous abnormal discharge occurs, 10 times of accumulated time theoretical value is about 100mS, and the detection reference can realize program control. The whole circuit has high detection speed and reliability, is suitable for the test requirement of a large-batch automatic production line, and exactly meets the production line requirement of battery cores.
When the insulation inside the battery core Cx is good, the voltage rising and holding state is relatively stable, a unidirectional direct current signal is passed through the inductor L1, the inductor corresponds to a wire, and no voltage signal is generated at this time, thereby determining that the battery core to be tested is good. If the internal insulation defect of the battery core occurs, the battery core Cx cannot stably maintain the charged energy, the electric gap caused by the internal insulation damage of the battery core is too small, internal instantaneous discharge is formed, the current is changed drastically, induced electromotive force is formed after flowing through the inductor L1, the changed induced electromotive force is continuously collected by a later circuit, and the changed induced electromotive force is sent to a data collection system for calculation and judgment after being conditioned and amplified.
The circuit structure and the testing method monitor the variation of the insulation leakage current in real time, and change a rapidly-changed physical quantity into high and low level changes through the adjustment of a later-stage circuit, thereby being beneficial to the rapid identification of a singlechip data acquisition system. The data size in the test process is rich, the average value is not required to be calculated after waiting for a period of time, the insulation leakage currents with different change speeds can be measured only by reasonably selecting the model numbers of the operational amplifier and the comparator, and the test time can be accelerated to 100mS level. Compared with the traditional insulation resistance testing method, the testing time is shortened by several times.
In the embodiments of the present utility model, technical features that are not described in detail are all existing technologies or conventional technical means, and are not described herein.
Finally, it should be noted that: the above examples are only specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model. Those skilled in the art will appreciate that: any person skilled in the art may modify or easily conceive of changes to the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (5)
1. The battery core insulation damage leakage current detection circuit is characterized by comprising an operational amplifier IC1, an IC2 and an IC3, a comparator IC4 and an IC5, wherein after being connected in parallel, one end of a sampling inductor L1 and a protection piezoresistor RV1 are connected with reference ground, one end of the other end of the sampling inductor R3 is electrically connected with one end of a resistor R3, one end of the resistor R4 and one end of the resistor R5 are respectively electrically connected with reference ground, the other end of the resistor R4 is electrically connected with one end of the capacitor C2, the other end of the C2 is respectively electrically connected with one end of the resistor C3 and one end of the resistor R7, the other end of the resistor R6 is connected with reference ground, the other end of the resistor R7 is electrically connected with one end of the reverse input end of the IC3, the reverse input end of the IC3 is electrically connected with one end of the IC3, the output end of the IC3 is respectively electrically connected with the reverse input end of the IC4 and one end of the forward input end of the IC5, the reverse input end of the IC1 is electrically connected with the output end of the IC1, the output end of the IC4 is electrically connected with the output end of the IC2, the other end of the IC2 is electrically connected with the output end of the IC2, and the other end of the input end of the IC2 is electrically connected with the reverse input end of the resistor R2.
2. The circuit for detecting leakage current of insulation damage to a battery cell according to claim 1, wherein the battery cell to be detected is connected between the high voltage and the circuit, and the circuit is electrically connected in parallel with the sampling inductor L1, the other end of the protection varistor RV1 and one end of the resistor R3, respectively.
3. The battery cell insulation damage leakage current detection circuit according to claim 1, wherein the comparator IC4 and the comparator IC5 are respectively electrically connected to the single chip microcomputer data acquisition system.
4. The battery cell insulation damage leakage current detection circuit according to claim 1, wherein the current allowable limit is input to a positive input terminal of the IC 1.
5. The battery cell insulation damage leakage current detection circuit according to claim 1, wherein an output end of the IC4 is electrically connected to an input port GPIO1 of the single-chip microcomputer data acquisition system, and an output end of the IC5 is electrically connected to an input port GPIO2 of the single-chip microcomputer data acquisition system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322880266.7U CN221124827U (en) | 2023-10-26 | 2023-10-26 | Battery core insulation damage leakage current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322880266.7U CN221124827U (en) | 2023-10-26 | 2023-10-26 | Battery core insulation damage leakage current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221124827U true CN221124827U (en) | 2024-06-11 |
Family
ID=91373946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322880266.7U Active CN221124827U (en) | 2023-10-26 | 2023-10-26 | Battery core insulation damage leakage current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221124827U (en) |
-
2023
- 2023-10-26 CN CN202322880266.7U patent/CN221124827U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO1988001055A1 (en) | Apparatus and method for measuring battery condition | |
| CN105510833A (en) | Storage battery health status detection method, device and system | |
| CN108333548A (en) | Insulation resistance measuring apparatus and fault self-diagnosis method | |
| CN102854394A (en) | System for estimating health state of lithium ion battery and method for estimating health state of lithium ion battery by using same | |
| CN106936181B (en) | Detection circuit and detection method for contact impedance of charge and discharge loop and self-detection method thereof | |
| CN101581768B (en) | Method for quickly detecting DC internal resistance of cylindrical nickel-hydrogen high-power battery | |
| CN107884720B (en) | Detection method and detection device for battery module missing welding detection | |
| CN106199298A (en) | A kind of ultracapacitor module test technology | |
| CN113552495B (en) | Online detection method and device for leakage of storage battery of power supply system | |
| CN113030576B (en) | Alternating current injection insulation resistance detection circuit and method | |
| CN108539301B (en) | Device and method for rapidly eliminating charge and discharge polarization of battery | |
| CN110346651A (en) | Super capacitor module capacity internal resistance test device and its detection method | |
| CN102253346B (en) | Method and device for automatically testing battery charging | |
| CN221124827U (en) | Battery core insulation damage leakage current detection circuit | |
| CN102814292A (en) | Lithium ion battery consistency matching method and system | |
| CN108761342A (en) | A kind of new energy electric motor vehicle storage battery safety test method | |
| CN111796194A (en) | Pulse current method-based VRLA storage battery internal resistance online detection method and device for realizing same | |
| CN115825738A (en) | Battery pack performance detection system | |
| CN216563283U (en) | Online self-maintenance system for storage battery | |
| CN215678733U (en) | Detection device of portable storage battery charge and discharge tester | |
| CN113138347B (en) | Method for collecting battery parameters and calculating residual energy of power battery by double-pulse signals | |
| CN221199882U (en) | Battery core insulating property detection circuit | |
| CN106443479A (en) | Intelligent monitoring system for storage battery | |
| CN209946328U (en) | Four-wire symmetrical detection method test clamp | |
| CN106383323A (en) | Intelligent storage battery monitoring device and network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |