CN206362861U - A resistance testing device for lithium-ion battery pole piece coating material - Google Patents

Abstract

The utility model relates to a resistance test device of lithium ion battery pole piece coating material, include: the testing device comprises a testing platform, a plurality of testing conductive blocks, an internal resistance tester and a testing sample diaphragm, wherein a plane working platform is arranged at the upper end of the testing platform, a transverse sample placing area is arranged in the middle of the working platform, a graduated scale is arranged on the long edge of the sample placing area, the internal resistance tester is arranged below the working platform, a probe of the internal resistance tester is connected with the testing conductive blocks through a conducting wire, the transverse sample placing area of the testing sample is used for testing, and the testing conductive blocks are placed on the testing sample according to a set distance. The utility model discloses can measure the resistance of lithium ion battery material, calculate the resistivity of material, can evaluate the electric conductive property of lithium ion battery material system fast, shorten the evaluation cycle of material system, shorten the cycle of battery research and development, reduce the experiment input, reduce the research and development cost.

Description

A resistance testing device for lithium-ion battery pole piece coating material

technical field

The utility model relates to a lithium-ion battery testing device, in particular to a resistance testing device for a lithium-ion battery pole piece coating material.

Background technique

The internal resistance of a lithium-ion battery refers to the resistance encountered by the current flowing through the interior of the battery when the battery is working. It is composed of two parts: ohmic internal resistance and polarization internal resistance. The large internal resistance of the battery will reduce the working voltage of the battery and shorten the discharge time. The internal resistance is mainly affected by factors such as battery material, manufacturing process, and battery structure. It is an important parameter to measure battery performance. R&D personnel in the lithium-ion battery industry will consider the internal resistance of lithium-ion batteries when designing batteries. Therefore, when designing a lithium-ion battery, an appropriate amount of conductive additives will be added to the positive and negative electrode materials to reduce the internal resistance of the lithium-ion battery. Under the premise of ensuring the battery capacity and electrical performance, the internal resistance of the battery should be reduced as much as possible. However, the electrical conductivity of the material system is evaluated by making a battery, which takes a long period of time to make a battery, and the cost of making a battery is relatively high.

Contents of the invention

The purpose of this utility model is to provide a resistance testing device for lithium-ion battery pole piece coating materials to solve the above problems.

The technical scheme adopted by the utility model is: a resistance test device for coating materials of lithium-ion battery pole pieces, including: a test bench, several test conductive blocks, an internal resistance tester and a test sample diaphragm, and a test bench There is a flat workbench at the upper end, a horizontal sample placement area in the middle of the workbench, a scale is provided on the long side of the sample placement area, and an internal resistance tester is installed under the worktable, and the probe of the internal resistance tester is tested by wire connection. The conductive block is the sample placement area in the lateral direction of the test sample during the test, and the test conductive block is placed on the test sample at a set interval.

The internal resistance tester is provided with four probes, two of which are voltage signal test probes, and the other two are current signal test probes.

Beneficial effects of the utility model: the invention can measure the resistance of the lithium-ion battery material, calculate the resistivity of the material, quickly evaluate the conductivity of the lithium-ion battery material system, shorten the evaluation cycle of the material system, and shorten the cycle of battery research and development , reduce experimental investment and reduce research and development costs.

Description of drawings

Fig. 1 is a schematic diagram of one embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1, the utility model includes: a test bench 1, several test conductive blocks 3, an internal resistance tester 2 and a test sample diaphragm 4, the upper end of the test bench is provided with a plane workbench 11, and the middle part of the workbench is provided with There is a horizontal sample placement area 111, a scale is provided on the long edge of the sample placement area, and an internal resistance tester 2 is provided under the work surface, and the probe of the internal resistance tester is connected to the test conductive block by a wire, and the lateral direction of the sample is tested during the test. In the sample placement area, the test conductive blocks are placed on the test sample at a set interval.

The internal resistance tester is provided with four probes 21, two of which are voltage signal test probes, and the other two are current signal test probes. The invention can measure the resistance of the lithium-ion battery material, calculate the resistivity of the material, quickly evaluate the conductivity of the lithium-ion battery material system, shorten the evaluation cycle of the material system, shorten the cycle of battery research and development, reduce experimental investment, and reduce research and development cost.

Evenly coat the battery material to be tested on the PET insulating film and bake it dry to make a 15CM*25CM rectangular sheet test sample, place the test sample on the insulating test plane, and then place the four test fixtures as required Go to the test sample, and record the corresponding internal resistance data by moving one of the test fixtures. Then, the resistivity of the material system is calculated by the formula of ρ= Rdw/ L resistivity, and the difference in electrical conductivity of each material system is compared to screen out the material system with low resistivity. The test principle is: According to the resistivity formula of ρ= Rdw/ L, measure the resistance of the sample at a fixed distance, and the resistivity can be calculated by fitting. (ρ-resistivity, R-resistance, d-test sample thickness, w-test sample width, L-tool potential distance).

In order to eliminate the error of the test and improve the reliability of the test data, the data is collected with multiple data points. According to the above test results, the calculated resistivity of formula 5 is smaller, and other formulas can be excluded, and formula 5 is directly selected for verification experiments. The number of formula screening experiments is reduced, thereby shortening the research and development cycle of lithium-ion batteries and reducing research and development costs. The resistance testing device is simple to operate, shortens the evaluation cycle of the material system, reduces experiment investment, reduces research and development costs, and has high use value in the research and development of lithium-ion batteries.

Claims (2)

1. a kind of resistance testing device of electrodes of lithium-ion batteries coating material, it is characterised in that：Including：One testboard（1）、 Several piece testing conductive block（3）, an internal resistance test device（2）With test sample diaphragm（4）, testboard upper end is provided with planar working table （11）, workbench middle part is provided with horizontal sample deposition（111）, the long side edge of sample deposition is provided with graduated scale, work Table top has internal resistance test device（2）, internal resistance test device probe is by wire connecting test conducting block, and test sample is horizontal during test To sample deposition, testing conductive block put on the test specimen by the spacing of setting.

2. a kind of resistance testing device of electrodes of lithium-ion batteries coating material according to claim 1, it is characterised in that： Described internal resistance test device is provided with four probes（21）, two of which is that voltage signal tests probe, and another two current signal is surveyed Sound out pin.