CN218497072U - Detection apparatus for little short circuit - Google Patents
Detection apparatus for little short circuit Download PDFInfo
- Publication number
- CN218497072U CN218497072U CN202222483850.4U CN202222483850U CN218497072U CN 218497072 U CN218497072 U CN 218497072U CN 202222483850 U CN202222483850 U CN 202222483850U CN 218497072 U CN218497072 U CN 218497072U
- Authority
- CN
- China
- Prior art keywords
- module
- voltage
- charge storage
- short circuit
- tested
- 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
Images
Landscapes
- Secondary Cells (AREA)
Abstract
The utility model relates to a detection device of micro short circuit, which is used for detecting the micro short circuit of a cell to be detected and comprises a charge storage module, a voltage monitoring module and a first switch module; the utility model discloses a battery test device, including electric charge storage module, first switch module, the electric charge that awaits measuring, voltage monitoring module with the electric core that awaits measuring is parallelly connected in order to acquire the voltage signal at the electric core both ends that awaits measuring, wherein, the electric charge amount of default can be stored to the electric charge storage module, the utility model discloses can accurately monitor the pressure drop and the energy loss in the electric core testing process to and whether real-time judgement takes place the short circuit a little, can wide application in the battery test technical field.
Description
Technical Field
The utility model relates to a battery detects technical field, especially relates to a detection device of little short circuit.
Background
High-pot test, i.e. high potential, dielectric withstand voltage test, without damaging the insulating materialUnder the condition of performance, the process of applying high voltage to an insulating material or an insulating structure is called Hi-pot detection, and the main purpose is to detect the capability of an insulating medium subjected to working voltage or overvoltage so as to check whether the insulating performance of products and equipment meets the safety standard. The Hi-pot test of the cell is generally performed before the lithium salt electrolyte is injected, the lithium ion deintercalation reaction loses a channel, as shown in fig. 1, and the physical state of the cell can be equivalent to the resistance formed by the combination of the anode, the diaphragm and the cathode (R, R) 1 ) Physical model of the shunt capacitance (C).
Currently, the Hi-pot test method for an uninjected battery cell in the prior art mainly includes two categories: the first type is an insulation resistance measurement method, firstly, after adjustable voltage is applied, equipment collects detected current, and then an insulation resistance value is calculated, the basic principle formula is R = U/I, and the short circuit condition of a battery core can be detected; the second type is pulse type detection, which can output step type boosting pulse according to programming, and is measured by monitoring peak voltage Vp applied to the electric core, voltage drop Vd1 in the charging process and Vd2 in the voltage peak holding stage, and can judge whether partial discharge exists in the electric core in the testing process according to voltage drop data in the testing process, thereby not only monitoring the short circuit of the electric core, but also detecting the micro short circuit condition of the electric core, and being a more accurate testing method.
However, the second type of test method also has its own limitation, and since the pulse test also continuously charges the tested battery cell during the voltage drop in the detection process, the measured voltage drop is smaller than the voltage drop actually generated by the consumed electric quantity due to the partial discharge of the battery cell, and the actual voltage drop and the actual consumed electric quantity of the partial discharge of the battery cell cannot be measured.
Disclosure of Invention
To the above problem, the present invention provides a detection device capable of measuring the actual voltage drop of the local discharge of the battery core and the micro short circuit of the actual consumed electric quantity.
In order to achieve the purpose, the utility model adopts the following technical proposal: a detection device for micro short circuit is used for detecting the micro short circuit of a battery cell to be detected and comprises a charge storage module, a voltage monitoring module and a first switch module;
the charge storage module, the first switch module and the battery cell to be tested are connected in series, the voltage monitoring module and the battery cell to be tested are connected in parallel to acquire voltage signals at two ends of the battery cell to be tested, and the charge storage module can store the charge quantity of a preset value. Further, the battery pack further comprises a voltage output module, and the voltage output module is connected with the charge storage module and the battery cell to be tested in parallel.
Further, the voltage control circuit further comprises a second switch module, wherein the second switch module is connected to the output end of the voltage output module in series so as to control the output state of the voltage output module.
Further, the charge storage module includes a standard capacitor, and the standard capacitor is connected in parallel with the voltage output module and the battery cell to be tested.
Further, the standard capacitor has a capacity ranging from 20nF to 10000 nF.
Further, the voltage mode output by the voltage output module comprises one of a straight-line boosting mode and a stepped boosting mode.
The processing module is in signal connection with the voltage monitoring module to calculate the charge amount stored in the battery cell to be tested according to the voltage signal acquired by the voltage monitoring module.
Further, the voltage monitoring module is a voltmeter.
Further, the detection range of the voltage monitoring module is between 50V and 2000V.
The battery further comprises electric equipment and a third switch module, wherein the third switch module is connected in series with the electric equipment and then connected in parallel with the battery cell to be tested and the charge storage module.
The utility model discloses owing to take above technical scheme, it has following advantage:
1. compare with traditional Hi-pot test instrument, the utility model discloses a set up charge storage module, break and adopt the direct mode that charges for the electric core that awaits measuring of power, and then adopt earlier to charge for charge storage module, then the mode that charges for the electric core that awaits measuring through charge storage module, the electric quantity that charge storage module filled for the electric core that awaits measuring can be quantified through the mode of the voltage monitoring module monitoring process voltage that sets up, consequently in electric core screening process, when can monitoring the electric core process pressure drop that awaits measuring, process data such as electric quantity that the monitoring electric core consumed more accurately.
2. The utility model discloses a charge storage module adopts standard capacitor, and the electric charge can be preserved for a long time in the condenser, and can obtain standard capacitor's charge amount through voltage measurement standard capacitor both ends voltage, consequently can realize earlier for the standard capacitor after charging through the mode that standard capacitor charges for the electric core that awaits measuring, through the charging voltage numerical value of standard capacitor record testing process, the electric charge amount of the electric core that awaits measuring is calculated to the accuracy, reduces the pressure drop calculation error, improves the pressure drop detection precision.
3. The utility model discloses owing to be provided with processing module, can judge whether take place little short circuit in real time in the electric core charging process that awaits measuring.
To sum up, the utility model discloses can the wide application in the battery detects among the technical field.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a physical model structure of a battery cell provided by the present invention;
fig. 2 is a schematic diagram of the circuit connection of the micro short circuit detection device provided by the present invention.
The names of the components denoted by the respective reference numerals in the drawings are as follows:
the system comprises a battery cell to be tested, 2-a first switch module, 3-a voltage monitoring module, 4-a voltage output module, 5-a second switch module, 6-a charge storage module, 7-electric equipment and 8-a third switch module.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "upper", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
The micro short circuit, that is, the lithium battery has a micro short circuit phenomenon between internal cells or inside a single cell, and the short circuit does not directly burn out the battery, but reduces the performance of the cell in a short time (several weeks or months), resulting in the situation that a certain cell or the whole battery pack cannot be used at all.
In order to overcome the difficulty that can not accurate monitoring await measuring electric core partial discharge's true pressure drop and true power consumption in the test procedure, the embodiment of the utility model provides a detection device of little short circuit has considered the influence that the charge volume in the pressure drop test procedure produced to pressure drop detection, through charge storage module and the voltage monitoring module who sets up, can monitor pressure drop and energy loss in the electric core test procedure more accurately, improves the pressure drop and detects the precision.
As shown in fig. 2, the utility model provides a detection apparatus for little short circuit, including charge storage module 6, first switch module 2, voltage monitoring module 3, voltage output module 4 and second switch module 5.
The charge storage module 6, the first switch module 2 and the electric core 1 to be tested are connected in series, the voltage monitoring module 3 and the electric core 1 to be tested are connected in parallel, the voltage output module 4 and the charge storage module 6 and the electric core 1 to be tested are connected in parallel, and the second switch module 5 is connected in series to the output end of the voltage output module 4.
It should be noted that the battery cell 1 to be tested in this embodiment is a battery cell that has not been injected with electrolyte, and may be equivalent to the physical model shown in fig. 1.
The voltage output module 4 is used as a power supply for outputting a voltage signal indicating that the charge storage module 6 is fully charged.
The charge storage module 6 can store the charge amount with a preset value, is used for receiving the voltage signal output by the voltage output module 4, stores and transmits the charge, and charges the electric core 1 to be tested.
The first switch module 2 is configured to control a circuit in which the electrical core 1 to be tested is located to be turned on or off, so as to control whether the electrical core 1 to be tested receives the voltage signal output by the charge storage module 6.
The voltage monitoring module 3 is used for acquiring voltage signals at two ends of the battery cell 1 to be tested, and because the battery cell 1 to be tested is connected with the charge storage module 1 in parallel, the voltage signals of the charge storage module 6 can be acquired at the same time, so that the use of devices can be reduced.
The second switch module 5 is used for controlling the output state of the voltage output module 4 to control whether to output the voltage signal to the charge storage module 6.
In a preferred embodiment, the detection apparatus for a micro short circuit further includes a processing module, the processing module is in signal connection with the voltage monitoring module 3, and the processing module is configured to receive the voltage signal monitored by the voltage monitoring module 3 in real time, determine, according to the obtained voltage signal, the actual electric quantity transferred to the electrical core 1 to be detected by the voltage output module 4, that is, the electric charge quantity stored in the electrical core 1 to be detected, and determine, according to the real-time voltage in the charging process of the electrical core 1 to be detected, whether a partial discharge exists in the charging process of the electrical core 1 to be detected, that is, whether a micro short circuit occurs.
In a preferred embodiment, the detection apparatus for a micro short circuit further includes an electric device 7 and a third switch module 8, where the electric device 7 is connected in series with the third switch module 8 and then connected in parallel with the electric core 1 to be tested and the charge storage module 6, so as to be used for discharging after the test of the electric core 1 to be tested, preferably, the electric core 1 to be tested can be discharged to below 10V, and thus, the safety risk caused by the fact that the electric core 1 to be tested still retains charges after the test is avoided.
In a preferred embodiment, the voltage output by the voltage output module 4 includes a linear boost mode, a step-type boost mode, etc., to fully charge the charge storage module 6.
The utility model discloses one of them logical combination has been selected schematically to explain, and wherein, charge storage module 6 adopts standard capacitor, and voltage monitoring module 3 adopts the voltmeter. The maximum charge amount stored by the standard capacitor is known, and whether the standard capacitor is full can be known by detecting the voltage across the standard capacitor, i.e. the charge amount of the charge storage module 6 can be indirectly obtained by the voltage monitoring module 3.
The positive pole of the voltage output module 4 is connected in parallel with one end of the standard capacitor, the first switch module 2 and the voltmeter through the second switch module 5, the other end of the first switch module 2 is connected with one end of the battery cell 1 to be tested, and the other ends of the standard capacitor, the battery cell 1 to be tested and the voltmeter are connected in parallel with the negative pole of the voltage output module 4. The utility model discloses adopt voltage output module 4 earlier to charge for standard capacitor, then adopt standard capacitor to charge for the electric core 1 that awaits measuring, can break the mode that adopts the power direct to charge for the electric core 1 that awaits measuring among the prior art, can measure the electric quantity consumption value of the electric core 1 charging process that awaits measuring more accurately.
Specifically, the standard capacitor has a capacity ranging from 20nF to 10000 nF.
Specifically, the detection range of the voltmeter is between 50V and 2000V.
The following describes the use of the micro short circuit detection device according to the present invention in detail by using specific embodiments:
1) The voltage output module 4 outputs an arbitrary voltage signal.
2) The second switch module 5 is closed, the first switch module 2 is disconnected, the charge storage module 6 is charged to the set voltage through the voltage signal output by the voltage output module 4 until the charge storage module 6 is fully charged, and at the moment, the charge on the charge storage module 6 is Q 1 ，Q 1 ＝C 6 *U 0 Wherein, C 6 A capacitor, U, of the charge storage module 6 0 Is a set voltage, i.e., a voltage before detection.
3) The second switch module 5 is disconnected, the first switch module 2 is closed, the fully charged charge storage module 6 starts to charge the electric core 1 to be tested, as time goes on, the charge storage module 6 and the charge on the electric core 1 to be tested are redistributed and reach new balance, and the voltage and the electricity at the two ends of the electric core 1 to be testedThe voltages at the two ends of the charge storage module 6 are equal, and the charge on the electric core 1 to be tested is Q at the moment 2 ，Q 2 ＝C cell * U, the charge on the charge storage module 6 is Q 3 ，Q 3 ＝C 6 * U; wherein U is the final voltage at two ends of the cell 1 to be tested, and C cell The capacitance of the electric core 1 to be measured.
4) The voltage monitoring module 3 monitors the real-time voltage of the battery cell 1 to be tested in the charging process and sends the real-time voltage to the processing module.
5) The processing module receives the voltage signal sent by the voltage monitoring module 3 in real time.
6) The processing module determines that the real electric quantity transferred to the battery cell 1 to be detected by the voltage output module 4 is Q according to the monitored final voltage at the two ends of the battery cell 1 to be detected 4 ，Q 4 ＝C 6 *(U 0 U) that can measure precisely the power consumption value of the cell 1 under test during charging, where C 6 Is the capacitance of the charge storage module.
7) The processing module judges whether partial discharge exists in the charging process of the battery cell 1 to be tested, namely whether micro short circuit occurs according to the real-time voltage in the charging process of the battery cell 1 to be tested.
Preferably, the judgment of the micro short circuit detection is:
the voltage monitoring module 3 monitors the voltage of the cell 1 to be detected before and after the detection process to be U 0 And U, namely the voltage drop of the cell 1 to be tested is U 0 -U; however, during the monitoring process, the voltage that the charge storage module 6 continuously charges the battery cell 1 to be tested is Δ U (i.e. the voltage that the charge storage module 6 transmits to the battery cell 1 to be tested, and is calculated by the amount of transmitted charge:Δu = (U) 0 -U)C 6 /C cell ) Wherein, C 6 Is the capacitance, C, of the charge storage module 6 cell The capacitance of the cell 1 to be tested is, therefore, the voltage signal at the two ends of the cell 1 to be tested should be substantially U 0 +. DELTA.U-U when U 0 And when the plus delta U-U is larger than a certain set value, judging that partial discharge exists and micro short circuit exists, wherein a proportional relation exists between the set value and the capacity of the battery cell 1 to be tested, and setting according to the specifically used battery cell 1 to be tested. Thus, the charging of the battery cell 1 to be detected in the detection process can be fully consideredThe condition makes the electric core 1 charge amount to be measured more accurate, and then improves the detection precision.
The above embodiments are only used for explaining the present invention, wherein the structure, connection mode, manufacturing process, etc. of each component can be changed, and all the equivalent transformations and improvements performed on the basis of the technical solution of the present invention should not be excluded outside the protection scope of the present invention.
Claims (10)
1. A detection device for micro short circuit is used for detecting the micro short circuit of a battery cell to be detected, and is characterized by comprising a charge storage module, a voltage monitoring module and a first switch module;
the charge storage module, the first switch module and the battery cell to be tested are connected in series, the voltage monitoring module and the battery cell to be tested are connected in parallel to acquire voltage signals at two ends of the battery cell to be tested, and the charge storage module can store the charge quantity of a preset value.
2. The apparatus of claim 1, further comprising a voltage output module, wherein the voltage output module is connected in parallel with the charge storage module and the cell under test.
3. The apparatus of claim 2, further comprising a second switch module, wherein the second switch module is connected in series to the output terminal of the voltage output module to control the output state of the voltage output module.
4. The apparatus of claim 2, wherein the charge storage module comprises a standard capacitor, and the standard capacitor is connected in parallel with the voltage output module and the cell under test.
5. A device for detecting a micro-short as claimed in claim 4, wherein the reference capacitor has a capacitance in the range of 20nF to 10000 nF.
6. The apparatus of claim 2, wherein the voltage output from the voltage output module has a voltage pattern selected from a linear boost mode and a stepped boost mode.
7. The apparatus according to claim 1, further comprising a processing module, wherein the processing module is connected to the voltage monitoring module by signals, so as to calculate the amount of charge stored in the battery cell according to the voltage signal obtained by the voltage monitoring module.
8. The apparatus of claim 1, wherein the voltage monitoring module is a voltmeter.
9. The apparatus of claim 1, wherein the voltage monitoring module is configured to detect a micro short circuit in a range of 50V to 2000V.
10. The apparatus according to any one of claims 1 to 9, further comprising an electrical device and a third switch module, wherein the third switch module is connected in series with the electrical device and then connected in parallel with the battery cell to be tested and the charge storage module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222483850.4U CN218497072U (en) | 2022-09-20 | 2022-09-20 | Detection apparatus for little short circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222483850.4U CN218497072U (en) | 2022-09-20 | 2022-09-20 | Detection apparatus for little short circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218497072U true CN218497072U (en) | 2023-02-17 |
Family
ID=85189831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222483850.4U Active CN218497072U (en) | 2022-09-20 | 2022-09-20 | Detection apparatus for little short circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218497072U (en) |
-
2022
- 2022-09-20 CN CN202222483850.4U patent/CN218497072U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9121909B2 (en) | Method for estimating state-of-charge of lithium ion battery | |
| JP6310553B2 (en) | Method for predicting the health of a battery in a hybrid vehicle | |
| RU2603260C2 (en) | Method for increasing service life of capacitors in sequential units and device for its implementation | |
| CN103158576B (en) | The method and system of battery current Measurement and calibration | |
| CN109856548B (en) | Power battery capacity estimation method | |
| WO2003034084A1 (en) | Electronic battery tester with relative test output | |
| EP1835297A1 (en) | A method and device for determining characteristics of an unknown battery | |
| WO2003079033A1 (en) | Electronic battery tester with battery failure temperature determination | |
| CN111175653A (en) | Method for identifying and prejudging capacity 'water-jumping' fault of ternary battery | |
| KR20150063254A (en) | Method for testing performance of cell | |
| CN108333548A (en) | Insulation resistance measuring apparatus and fault self-diagnosis method | |
| KR101725514B1 (en) | Diagnosis Method for State of Health of Lithium Secondary Battery | |
| CN112557926B (en) | Method and device for calculating residual charging time | |
| CN106405424B (en) | Method and device for metering residual electric quantity of lithium ion battery | |
| CN112505564A (en) | Method for measuring SOC-OCV curve of battery | |
| CN111216595B (en) | SOC calibration method of severe hybrid electric vehicle based on lithium battery equivalent circuit model | |
| CN111896880A (en) | Method for detecting service life of lithium ion battery for electric vehicle | |
| CN111965557A (en) | Backup power reliability assessment method and device | |
| CN212366052U (en) | Intelligent monitoring device for vehicle storage battery | |
| CN218497072U (en) | Detection apparatus for little short circuit | |
| CN112578299A (en) | Method and device for determining internal metal structure fracture of storage battery | |
| CN111025171A (en) | Rapid SOH (state of health) measurement method for power storage battery | |
| JP4090713B2 (en) | Nickel metal hydride battery capacity estimation method | |
| CN216563283U (en) | Online self-maintenance system for storage battery | |
| CN116068420A (en) | Battery consistency correction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518108 Floor 1-2, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen, Guangdong, China Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |
|
| CP03 | Change of name, title or address |