CN209784508U - Insulation resistance tester prevent slow-witted test sample spare - Google Patents

Abstract

The utility model relates to an insulation resistance tester prevent slow-witted test sample spare, include the base member unanimous with electric core actual shape, be fixed with anodal conducting strip and negative pole conducting strip on the terminal surface of base member, the fixed position of anodal conducting strip, negative pole conducting strip is unanimous with the position of the actual anodal conducting strip of electric core, negative pole conducting strip, is connected with the resistance of resistance for the technology definite value between anodal conducting strip and the negative pole conducting strip. The utility model discloses a design has the fool-proof test sample spare of resistance fixed, adopts the standard resistance as challenge piece to calibrate the insulation resistance tester, effectively ensures insulation resistance tester work at steady state, has guaranteed the stability and the uniformity of battery in process of production, and the effectual battery that has avoided having the short circuit risk flows toward the customer in hand.

Description

A foolproof test sample of an insulation resistance tester

technical field

The utility model belongs to the technical field of foolproof testing of an insulation resistance tester, in particular to a foolproof test sample of an insulation resistance tester.

Background technique

Lithium-ion batteries are widely used in mobile electronic devices, passenger electric vehicles, and various energy storage devices due to their high energy density. In the production process of lithium batteries, due to the introduction of metal scraps, dust and foreign matter, the internal short circuit of the battery will be caused, so many equipment for short circuit detection will be distributed on the assembly line. Group FT1 test system", the test equipment includes contact resistance tester, insulation tester and voltage acquisition tester. In order to ensure the authenticity and effectiveness of short-circuit test equipment, it is necessary to regularly conduct fool-proof tests on short-circuit test equipment.

During the manufacturing process of the battery, it generally goes through processes such as pulping, coating, roll cutting, winding/lamination, assembly, drying, liquid injection, and formation. The process will introduce metal scraps, dust, foreign objects, etc., and the winding is the first process of the short circuit test in the production process of the battery, so the first insulation resistance test is carried out on the battery after winding; Ear welding will introduce metal dust and dust, so an insulation internal resistance test will be carried out after the ultrasonic welding station; after the battery is sealed in the shell, due to the change of the state of the electrode lugs of the battery, the friction between the shell and the cover plate introduces metal shavings , so an insulation internal resistance test is generally carried out after sealing; after the battery is dried, due to the thermal shrinkage of the diaphragm, the diaphragm defect is enlarged, so there is usually an insulation internal resistance test after drying. If the short-circuited cells can be picked out in time during the assembly process, some expensive materials can be saved. Picking out the multi-cell tabs in time before welding can avoid the scrapping of other cells, and if it is a lamination, it can be repaired/reworked in time, so ensuring the effectiveness of the insulation internal resistance test in each process is very important for controlling production costs. important role. After drying, it is the last process of short-circuit measurement. If the insulation internal resistance tester fails, there will be short-circuit batteries flowing to the forming process, and phenomena such as bulging, fire, and explosion will occur. If the micro-short-circuit battery is not picked out during the formation self-discharge test process and flows into the hands of customers, it is even more of a safety hazard.

In order to ensure the effectiveness of the insulation internal resistance test, the short-circuit cells/batteries produced recently in the current process are generally used as error-proof samples for fool-proof testing, and the insulation internal resistance tester is calibrated. / Cells/battery products that are higher than the process limit value are not easy to obtain. The process limit value is the standard used to determine whether the battery is short-circuited. It is judged as a short circuit below the process limit value, and it is qualified when the process limit value is above. According to experience, the battery is short-circuited The threshold value of the judgment is 5MΩ. And the internal resistance of the cell/battery will change greatly after multiple measurements, so the standard parts are generally used for fool-proof tests instead of challenge parts. Challenge parts refer to specially made extreme tooling that is close to the process limit value. /Limited products, while standard parts refer to OK/NG samples used for production. The internal resistance value of OK/NG samples is uncertain and usually has a large gap with the process definition value. The equipment uses limit parts for fool-proof testing, and there will be micro-short-circuit cells, that is, cells with a resistance value slightly lower than the process limit value will flow to the next process, or cells slightly higher than the process limit value will be mistakenly selected to cause electricity. Unnecessary scrapping of the core.

Utility model content

The purpose of the utility model is to provide a foolproof test sample of an insulation resistance tester, which is used to solve the problem that the resistance of the limit piece is not equal to the insulation resistance caused by the process limit value when the limit piece is used as the foolproof test piece in the prior art. The fool-proof test of the tester is unreliable.

In order to solve the above-mentioned technical problems, the utility model proposes a fool-proof test sample of an insulation resistance tester, which includes a base body that is consistent with the actual shape of the cell, and the end surface of the base body is fixed with a positive conductive sheet and a negative conductive sheet. , The fixed position of the negative conductive sheet is consistent with the actual position of the positive conductive sheet and the negative conductive sheet of the cell.

The utility model adopts the standard resistance that can be used as a challenge piece to calibrate the insulation resistance tester by designing a fool-proof test sample with a fixed resistance value, which effectively ensures that the insulation resistance tester works in a stable state and ensures that the battery is in production. The stability and consistency in the process effectively prevent the battery with the risk of short circuit from flowing into the hands of customers.

In order to ensure the fixed connection between the end surface of the base body and the positive and negative electrode conductive sheets, further, the positive electrode conductive sheet and the negative electrode conductive sheet are fixed to the end faces of the base body through a support structure.

In order to ensure the support effect of the support structure, further, the support structure is a step, and the step is fixedly connected with the end face of the base body; or, the step is integrally formed with the base body through the end face of the base body.

In order to protect the resistor, further, a card cover for protecting the resistor is arranged above the resistor as a support device for the resistor.

The resistance is a sliding varistor with a scale. The sliding varistor with a scale can be adjusted manually to achieve free switching between different resistance values. . When the process parameters are changed, they can be switched freely, and there is no need to re-make fool-proof test samples.

Description of drawings

Fig. 1 is the schematic diagram of the foolproof test sample of the insulation resistance tester of the first embodiment of the present invention;

2 is a schematic diagram of a foolproof test sample of the insulation resistance tester of the second embodiment of the present invention;

The labels in Figure 1 are explained as follows:

1—positive conductive sheet, 2—standard resistance, 3—negative conductive sheet, 4—matrix;

The labels in Figure 2 are explained as follows:

9—Anode conductive sheet, 10—Sliding varistor, 11—Negative electrode conductive sheet, 12—Substrate.

Detailed ways

The specific embodiments of the present utility model will be further described below with reference to the accompanying drawings.

Example 1:

As shown in Figure 1, a foolproof test sample of an insulation resistance tester includes a base body 4 that is consistent with the actual shape of the cell, and a positive electrode conductive sheet 1 and a negative electrode conductive sheet 3 are fixed on the end surface of the base body 4. The positive electrode conductive sheet 1. The fixed position of the negative electrode conductive sheet 3 is consistent with the actual position of the positive electrode conductive sheet and the negative electrode conductive sheet of the cell. A standard resistor 2 is connected between the positive electrode conductive sheet 1 and the negative electrode conductive sheet 3, and the resistance value of the standard resistor 2 is the process Delimited value.

The above-mentioned positive electrode conductive sheet 1 and negative electrode conductive sheet 3 are fixed to the end face of the base body 4 through the support structure, so that the positive electrode conductive sheet 1 and the negative electrode conductive sheet 3 are supported by the support structure, so as to ensure that the positive electrode conductive sheet 1 and the negative electrode conductive sheet 3 are in the base body 4. fixed effect on the end face.

The above-mentioned support structure is preferably a step, and the step is fixedly connected to the end face of the base body 4 . As another embodiment, the step can also be integrally formed with the base body 4 through the end face of the base body 4 .

In order to protect the resistor, a card cover is arranged above the resistor as a support device for the resistor. When the test is not required, the resistor is covered by the card cover to play a protective role.

Specifically, a cell-shaped tooling is made of insulating rubber with high temperature resistance and pressure resistance, a step is milled from the front end of the tooling, and an aluminum conductive sheet is used as the positive conductive sheet 1 to be bonded to one side of the tooling, and the copper conductive sheet is As the negative electrode conductive sheet 3, it is bonded to the other side of the tool, and the position is shown in Figure 1. The two ends of the standard resistor 2 are respectively connected to the positive/negative conductive sheets, and a square card cover is provided just above the standard resistor 2 as a support device for protecting the standard resistor 2 . In addition, the above-mentioned tooling is a structure in which the base body and the step are integrally formed.

The utility model selects a standard internal resistance whose resistance value is a process defined value. The standard internal resistance leads out two wires, and the two ends of the wires are respectively connected with red and black metal clips to distinguish the positive and negative electrodes. Since the insulation internal resistance test is a high-voltage test, in order to ensure the safety of operation, the standard internal resistance, wires, and clips are all protected by insulating layers.

When the standard resistance 2 of the utility model is used to make a fool-proof test sample of an insulation resistance tester, place the fool-proof test sample into a hot-pressed (wound cell)/cold-pressed (laminated cell) to measure short-circuit On the production line, when the fool-proof test sample flows into the short-circuit measurement station with the normal cell, the probe of the insulation resistance tester is pressed down on the positive/negative conductive sheet, and the internal resistance value output by the insulation resistance tester is the connection at The resistance value of the standard resistor 2 between the positive and negative conductive sheets. If the resistance value of the standard resistance 2 is less than the set judgment value, if the insulation resistance tester alarms during the test, and the fool-proof test sample is taken out as a short-circuit cell, the fool-proof test process of the insulation resistance tester is completed, and the It is considered that the insulation resistance tester is working normally; on the contrary, if the insulation resistance tester has no alarm during the test, it is judged that the equipment is abnormal. If the resistance value of the standard resistance 2 is greater than the set judgment value, if the insulation resistance tester does not alarm during the test, the fool-proof test sample flows normally on the production line, the fool-proof test process of the insulation resistance tester is completed, and the insulation resistance tester is judged. The resistance tester works normally. On the contrary, if the insulation resistance tester alarms during the test, it is judged that the insulation resistance tester is abnormal.

The utility model uses a standard resistance with a known resistance value as a challenge piece to perform a fool-proof test on the insulation resistance tester, which can effectively ensure that the insulation resistance tester works in a stable state. It effectively prevents short-circuit batteries and micro-short-circuit batteries from flowing to the next process due to equipment failure and instability, avoids the scrapping of some expensive materials, and reduces the safety hazard of finished batteries.

In addition, the utility model can also place a standard resistor with a known resistance value on a tool with the shape of a cell after winding/lamination, and the tool requires high temperature resistance, pressure resistance and insulation capabilities. The left and right wires of the standard resistor are respectively connected to the tab model.

By making a standard internal resistance with a known resistance value into a tool with the shape of a cell after winding/lamination, it is possible to conduct a foolproof test on the equipment without stopping the equipment. Since the insulation internal resistance tester and the robot that automatically picks defective products belong to different institutions, the use of the tooling to run the automatic line can not only perform error-proofing on the effectiveness of the insulation internal resistance tester, but also perform error-proofing tests on the robot for picking defective products, thereby The defective products that have been tested can be automatically picked out, and a complete set of error proofing tests are completed.

Embodiment 2:

The foolproof test sample of the insulation resistance tester as shown in FIG. 2 includes a base body 12 that is consistent with the actual shape of the cell, and the end surface of the base body 12 is fixed with a positive electrode conductive sheet 9 and a negative electrode conductive sheet 11. The positive electrode conductive sheet 9, The fixed position of the negative electrode conductive sheet 11 is consistent with the actual positions of the positive electrode conductive sheet and the negative electrode conductive sheet of the cell. A sliding varistor 10 with scale is connected between the positive electrode conductive sheet 9 and the negative electrode conductive sheet 11 .

The difference between the second embodiment and the first embodiment is that the sliding varistor 10 with a scale can be manually adjusted to replace the standard resistance, and the free switching between different resistance values can be realized, which can be used as a challenge for foolproof testing, and can also be used as a test piece. As a standard part for foolproof testing. When the process limit value is changed, it is only necessary to adjust the resistance value of the sliding varistor 10, so as to realize the free switching of the resistance value of the sliding varistor, and it is not necessary to re-make a foolproof test sample.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the scope of the claims of the present utility model.

Claims (6)

1. a fool-proof test sample of an insulation resistance tester, is characterized in that, comprises the matrix consistent with the actual shape of the electric core, the end face of the matrix is fixed with positive conductive sheet and negative conductive sheet, positive conductive sheet, negative conductive sheet The fixed position of the battery cell is consistent with the actual position of the positive electrode conductive sheet and the negative electrode conductive sheet. A resistor with a resistance value of the process defined value is connected between the positive electrode conductive sheet and the negative electrode conductive sheet. 2 . The foolproof test sample of the insulation resistance tester according to claim 1 , wherein the positive electrode conductive sheet and the negative electrode conductive sheet are fixed to the end face of the base body through a support structure. 3 . 3 . The foolproof test sample of an insulation resistance tester according to claim 2 , wherein the support structure is a step, and the step is fixedly connected to the end face of the base body. 4 . 4 . The foolproof test sample of an insulation resistance tester according to claim 2 , wherein the support structure is a step, and the step is integrally formed with the base through the end face of the base. 5 . 5 . The foolproof test sample of an insulation resistance tester according to claim 1 , wherein a card cover for protecting the resistance is arranged above the resistance. 6 . 6 . The foolproof test sample of an insulation resistance tester according to claim 1 , wherein the resistance is a scaled sliding rheostat. 7 .