Detection device of battery tester

Abstract

The utility model discloses a detection device of battery tester. The detection device includes analog electric core, capacitor and resistor. Analog electric core includes electric core body, positive pole lug and negative pole lug, and positive pole lug and negative pole lug are connected with electric core body, and positive pole lug is used for the electric connection battery tester's positive pole, and negative pole lug is used for the electric connection battery tester's negative pole. Capacitor is connected in series with positive pole lug and negative pole lug respectively. Resistor is connected in parallel with capacitor, and resistor is connected in series with positive pole lug and negative pole lug respectively. In the detection device, capacitor and resistor parallel circuit can simulate electric core equivalent circuit. When testing, the electric core equivalent circuit before battery liquid injection can be regarded as the parallel circuit of capacitor and resistor. According to the capacitance of capacitor, the resistance of resistor and test voltage, the size of leakage current can be calculated and controlled, so that whether the battery tester can detect the electric core micro short circuit defect under the limit condition is detected, and the reliability of battery tester is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of battery testing equipment, and in particular to a testing device for a battery tester. Background Technology

[0002] During the production of lithium-ion batteries, micro-short circuits may occur inside the cell due to material defects, process damage, or the introduction of foreign matter. Currently, the most commonly used short-circuit tester for lithium-ion battery cells before electrolyte filling is the pulse-type lithium battery cell micro-short-circuit tester, which is a dedicated tester designed for short-circuit and micro-short-circuit testing of lithium batteries with capacitive and resistive characteristics.

[0003] Battery testers may experience a decrease in testing accuracy over long-term use due to environmental temperature and voltage fluctuations, or component wear, leading to quality issues such as false positives and false negatives. These problems are often subtle. Related testing devices cannot simulate the capacitive reactance characteristics of real battery cells, resulting in lower accuracy and an inability to detect false positives or false negatives. Utility Model Content

[0004] The main objective of this invention is to provide a detection device for a battery tester, aiming to solve the technical problem that related detection devices have low accuracy in detecting battery testers and cannot detect misjudgments or omissions in battery testers.

[0005] In order to achieve the above-mentioned utility model objectives, this utility model proposes a testing device for a battery tester.

[0006] A testing device for a battery tester, comprising:

[0007] A simulated battery cell includes a cell body, a positive tab, and a negative tab. The positive tab and the negative tab are both connected to the cell body. The positive tab is used to electrically connect to the positive terminal of the battery tester, and the negative tab is used to electrically connect to the negative terminal of the battery tester.

[0008] A capacitor, wherein the capacitor is connected in series with the positive electrode and the negative electrode respectively; and

[0009] A resistor is connected in parallel with the capacitor, and the resistor is connected in series with the positive tab and the negative tab respectively.

[0010] In one embodiment, the resistor is a variable resistor.

[0011] In one embodiment, the resistance value of the resistor is in the range of 5 to 50 MΩ.

[0012] In one embodiment, the capacitance of the capacitor ranges from 20 to 10,000 nF.

[0013] In one embodiment, the voltage change V during the capacitor charging phase C (t)=V0(1-e (-t / RC) ), where V C (t) represents the voltage across the capacitor over time, V0 represents the power supply voltage, t represents the test time, R represents the resistance value, and C represents the capacitance of the capacitor.

[0014] In one embodiment, the voltage change V during the capacitor discharge phase C (t)=V0 e (-t / RC) , where V C (t) represents the voltage across the capacitor over time, V0 represents the power supply voltage, t represents the test time, R represents the resistance value, and C represents the capacitance of the capacitor.

[0015] In one embodiment, the voltage change V C (t) ranges from 100 to 500V.

[0016] In one embodiment, the detection device further includes a protective cover disposed on the battery cell body, the protective cover and the battery cell body forming an accommodating space for accommodating the capacitor and the resistor.

[0017] In one embodiment, the protective cover is detachably mounted on the battery cell body.

[0018] In one embodiment, the protective cover is snapped together with the battery cell body.

[0019] Beneficial effects:

[0020] This invention relates to a testing device for a battery tester, comprising a simulated battery cell, a capacitor, and a resistor. The simulated battery cell includes a cell body, a positive tab, and a negative tab. Both the positive and negative tabs are connected to the cell body. The positive tab is used to electrically connect to the positive terminal of the battery tester, and the negative tab is used to electrically connect to the negative terminal of the battery tester. The capacitor is connected in series with both the positive and negative tabs. The resistor is connected in parallel with the capacitor and is also connected in series with both the positive and negative tabs. In this testing device, the parallel circuit of the capacitor and resistor can simulate the equivalent circuit of the battery cell. During testing, the positive terminal of the battery tester is electrically connected to the positive tab, and the negative terminal is electrically connected to the negative tab. The equivalent circuit of the battery cell before electrolyte filling can be considered as a parallel circuit of the capacitor and resistor. Based on the capacitance value of the capacitor, the resistance value of the resistor, and the test voltage, the leakage current during testing can be calculated and controlled, thereby checking whether the battery tester can detect micro-short circuit defects in the battery cell under extreme conditions, ensuring the reliability of the battery tester. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a detection device according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the detection device according to another embodiment of the present invention from another angle.

[0023] Figure 3 This is an equivalent circuit diagram of a battery cell according to an embodiment of the present invention.

[0024] Figure 4 This is a high-voltage insulation test voltage curve of an embodiment of the present invention.

[0025] in:

[0026] 100. Simulated battery cell; 110. Battery cell body; 120. Positive electrode tab; 130. Negative electrode tab;

[0027] 200. Capacitor;

[0028] 300. Resistor;

[0029] 400. Protective shield.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] like Figure 1 As shown, a testing device for a battery tester includes a simulated battery cell 100, a capacitor 200, and a resistor 300. The simulated battery cell 100 includes a cell body 110, a positive tab 120, and a negative tab 130. Both the positive tab 120 and the negative tab 130 are connected to the cell body 110. The positive tab 120 is used to electrically connect to the positive terminal of the battery tester, and the negative tab 130 is used to electrically connect to the negative terminal of the battery tester. The capacitor 200 is connected in series with both the positive tab 120 and the negative tab 130. The resistor 300 is connected in parallel with the capacitor 200, and is also connected in series with both the positive tab 120 and the negative tab 130.

[0036] In this testing device, the parallel circuit of capacitor 200 and resistor 300 can simulate the equivalent circuit of battery cell 100, such as... Figure 3 As shown. During testing, the positive terminal of the battery tester is electrically connected to the positive tab 120, and the negative terminal is electrically connected to the negative tab 130. The equivalent circuit of the battery cell before electrolyte filling can be considered as a parallel circuit of capacitor 200 and resistor 300, which can simulate the capacitive reactance characteristics of a real battery cell. Based on the capacitance value of capacitor 200, the resistance value of resistor 300, and the test voltage, the leakage current during testing can be calculated and controlled. This allows the tester to check whether it can detect micro-short circuit defects in the battery cell under extreme conditions, ensuring the reliability of the battery tester.

[0037] It should be noted that the simulated cell 100 does not contain the electrolyte inside a real cell; it is similar to a dummy cell. The simulated cell 100 mainly consists of a cell body 110, a positive tab 120, and a negative tab 130. Both the positive tab 120 and the negative tab 130 are connected to the cell body 110. This structural design is similar to that of a real cell, effectively simulating its external connection characteristics. This allows the simulated cell 100 to be effectively electrically connected to a battery tester. The positive tab 120 is used to electrically connect to the positive terminal of the battery tester, and the negative tab 130 is used to electrically connect to the negative terminal, providing the basic connection conditions for subsequent testing.

[0038] Specifically, the cell body 110 can be a square structure, with the positive electrode tab 120 located at one end of the cell body and the negative electrode tab 130 located at the other end of the cell body.

[0039] Specifically, the battery tester can be a lithium battery high-voltage insulation tester. This testing device can be used for the accuracy calibration of high-voltage insulation (Hi-pot) testers for micro-short circuit testing of cells before electrolyte filling on lithium battery production lines.

[0040] In some embodiments, the voltage change V during the charging phase of capacitor 200 C (t)=V0(1-e (-t / RC) ), where V C (t) represents the voltage across the capacitor over time, V0 represents the power supply voltage, t represents the test time, R represents the resistance value, and C represents the capacitance of capacitor 200.

[0041] Voltage change V during the discharge phase of capacitor 200 C (t)=V0 e (-t / RC) , where V C (t) represents the voltage across the capacitor over time, V0 represents the power supply voltage, t represents the test time, R represents the resistance value, and C represents the capacitance of capacitor 200.

[0042] It should be noted that the circuit constructed using simulated cell 100, capacitor 200, and resistor 300 simulates the equivalent parallel circuit of capacitor 200 and resistor 300 in a lithium battery cell before electrolyte filling. During the charging phase, when the battery tester applies voltage, capacitor 200 and resistor 300 are connected in parallel, and the voltages across both capacitor 200 and resistor 300 are the power supply voltage. As capacitor 200 begins to charge, the current gradually decreases until it is fully charged, and the capacitor voltage changes according to a specific pattern over time. C (t)=V0(1-e (-t / RC) The current through resistor 300 is stable at I. R=V0 / R. During the discharge phase, after the external voltage of the battery tester is removed, capacitor 200 and resistor 300 form a closed circuit. The electrical energy stored in capacitor 200 is released through the resistor, and the voltage across capacitor 200 changes with time as V. C (t)=V0 e (-t / RC) A DC or AC high voltage, much higher than the normal operating voltage, is applied between the positive and negative electrodes. The leakage current flowing through the tested component during the test is measured using a high-precision current sensor within the battery tester. The test voltage is as follows: Figure 4 As shown.

[0043] By controlling the resistance value of resistor 300 and the value of capacitor 200, the voltage change in the parallel circuit of capacitor 200 and resistor 300 is Vt = V0e. (-t / RC) Vt represents the voltage after the test. By precisely controlling the voltage after the test, and since the voltage change is closely related to the leakage current, precise control of the leakage current can be achieved. This precisely controlled leakage current can be used to calibrate the accuracy of the battery tester.

[0044] In some embodiments, resistor 300 is a variable resistor, adaptable to different test voltages and test times, and can be matched to determine the limiting leakage current for checking the accuracy of high-voltage insulation testing instruments. A variable resistor is an adjustable resistor. The resistance value of resistor 300 can be manually adjusted to meet circuit requirements. The variable resistor 300 can adjust its resistance value accordingly based on changes in the test voltage. According to Ohm's law, when the voltage changes, adjusting the resistance can maintain the current in the circuit within a suitable range, thereby matching the limiting leakage current at that test voltage and providing data support for accurately evaluating the accuracy of high-voltage insulation testing instruments.

[0045] Specifically, the resistance value of resistor 300 is in the range of 5 to 50 MΩ. The resistance value can be adjusted according to the specific test conditions to adapt to different test conditions and match various extreme leakage currents. This allows the testing device to more accurately test the precision of different battery testers, improving the accuracy and adaptability of the test.

[0046] Specifically, the capacitance range of capacitor 200 is 20–10000nF. Different battery testers have different requirements for test voltage, test time, and other parameters, and the capacitive reactance characteristics also vary among different types of battery cells. The variable resistor 300 has an adjustable resistance value in the range of 5–50MΩ, and the capacitance of capacitor 200 is adjustable in the range of 20–10000nF. The resistance and capacitance values ​​can be adjusted according to specific test conditions to adapt to different test conditions and match various limiting leakage current magnitudes. This allows the testing device to more accurately test the precision of different battery testers, improving the accuracy and adaptability of the testing.

[0047] Specifically, voltage change V C (t) The range is 100–500V. Different types of batteries will experience various voltage changes in actual use, which will be expressed as voltage changes V. C (t) The range is set to 100-500V to more comprehensively simulate the voltage changes of a real battery under different operating conditions. With this setting, the testing device can more accurately detect the performance of the battery tester, promptly identify potential misjudgments or omissions, improve the accuracy of the battery tester's testing, and ensure its normal operation in various practical application scenarios.

[0048] like Figure 2 As shown, in some embodiments, the detection device further includes a protective cover 400, which is disposed on the cell body 110. The protective cover 400 and the cell body 110 enclose a receiving space for accommodating the capacitor 200 and the resistor 300. The protective cover 400, disposed on the cell body 110 and enclosing the receiving space, houses the capacitor 200 and resistor 300 within the protective cover 400, creating a physical barrier for these critical electronic components. External dust, moisture, foreign objects, etc., are unlikely to directly contact the capacitor 200 and resistor 300, thus preventing corrosion and damage to the capacitor 200 and its resistance value. Specifically, the protective cover can be an anti-slip shell.

[0049] Specifically, the protective cover 400 is detachably mounted on the battery cell body 110. During battery use, internal components such as the capacitor 200 and resistor 300 may malfunction or require regular maintenance. The detachable protective cover 400 allows personnel to easily open it to inspect, repair, or replace the internal resistor 300 and capacitor 200 without scrapping the entire testing device or performing complex disassembly, thus reducing maintenance and time costs.

[0050] More specifically, the protective cover 400 is snap-fitted to the battery cell body 110. The snap-fit ​​connection is simple and quick. During the assembly and maintenance of the testing device, the protective cover 400 can be installed and removed quickly, improving work efficiency and reducing labor costs.

[0051] Specifically, a movable positioning pin is installed on the protective cover 400. One end of the positioning pin is fixedly connected to a locking disc, and multiple limiting protrusions are provided on the outer circumferential surface of the locking disc. Mounting plates are provided on both sides of the battery cell body 110. Locking grooves are opened inside the mounting plates. A limiting spring is fixedly connected to the bottom of the inner cavity of the locking groove, and the other end of the limiting spring is connected to a limiting top plate.

[0052] During installation, insert the positioning pin into the locking slot. The locking disc will press against the limiting top plate, compressing the limiting spring. When the limiting protrusion slides into the corresponding position in the locking slot, the limiting spring returns to its original position, lifting the limiting top plate upwards and locking the limiting protrusion, thus locking the positioning pin and completing the connection between the protective cover 400 and the battery cell body 110. During disassembly, press the positioning pin to disengage the limiting protrusion from the limiting top plate, allowing the positioning pin to be pulled out. This facilitates installation and disassembly, and makes it easier to inspect, repair, and replace the protective cover.

[0053] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A testing device for a battery tester, characterized in that, include: A simulated battery cell includes a cell body, a positive tab, and a negative tab. The positive tab and the negative tab are both connected to the cell body. The positive tab is used to electrically connect to the positive terminal of the battery tester, and the negative tab is used to electrically connect to the negative terminal of the battery tester. A capacitor, wherein the capacitor is connected in series with the positive electrode and the negative electrode respectively; and A resistor is connected in parallel with the capacitor, and the resistor is connected in series with the positive tab and the negative tab respectively.

2. The detection device according to claim 1, characterized in that, The resistor is a variable resistor.

3. The detection device according to claim 1, characterized in that, The resistance value of the resistor is in the range of 5 to 50 MΩ.

4. The detection device according to claim 1, characterized in that, The capacitance range of the capacitor is 20 to 10000 nF.

5. The detection device according to claim 1, characterized in that, The voltage change V during the capacitor charging phase C (t)=V0(1-e (-t / RC) ), where V C (t) represents the voltage across the capacitor over time, V0 represents the power supply voltage, t represents the test time, R represents the resistance value, and C represents the capacitance of the capacitor.

6. The detection device according to claim 5, characterized in that, The voltage change V during the capacitor discharge phase C (t)=V0 e (-t / RC) , where V C (t) represents the voltage across the capacitor over time, V0 represents the power supply voltage, t represents the test time, R represents the resistance value, and C represents the capacitance of the capacitor.

7. The detection device according to claim 6, characterized in that, The voltage change V C (t) ranges from 100 to 500V.

8. The detection device according to claim 1, characterized in that, The detection device also includes a protective cover, which is disposed on the battery cell body. The protective cover and the battery cell body enclose a receiving space, which is used to receive the capacitor and the resistor.

9. The detection device according to claim 8, characterized in that, The protective cover is detachably mounted on the battery cell body.

10. The detection device according to claim 8, characterized in that, The protective cover is snapped together with the battery cell body.

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