Testing device for testing temperature of battery through testing cabinet

Abstract

The utility model discloses a testing device for testing the temperature of a battery in a testing cabinet, which comprises a testing clamp electrically connected with the positive electrode and the negative electrode of the battery respectively, the testing clamp is arranged in a temperature box filled with insulating heat-conducting oil, and the battery to be tested is internally fixed in the temperature box and electrically connected with the testing clamp. The testing device for testing the temperature of the battery by the testing cabinet has the characteristics of high temperature control stability, good use flexibility, small size and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, in particular to a testing device used in a testing cabinet to perform temperature testing on batteries. Background Art

[0002] In secondary batteries, the high and low temperature performance of the battery refers to the working performance and stability of the battery in different temperature environments. Both high and low temperature environments will affect the performance of the battery.

[0003] Taking low temperature performance as an example, in a low temperature environment, the available capacity of the battery will usually decrease. This is because low temperature will reduce the ion migration speed of the electrolyte and slow down the discharge rate of the battery; low temperature will increase the internal resistance of the battery, causing the battery to generate more heat when discharging, and will also limit the battery's discharge capacity; using the battery in a low temperature environment for a long time may reduce the battery life, because the low temperature environment will affect the rate of chemical reactions in the battery, thereby accelerating the battery aging process.

[0004] Taking high temperature performance as an example, in a high temperature environment, the capacity of the battery may decay, because high temperature will accelerate the chemical reaction inside the battery and increase the self-discharge rate of the battery; high temperature environment can easily cause the battery to overheat, which in turn can cause safety accidents such as thermal runaway, fire or explosion. This risk is particularly prominent for high energy density batteries such as lithium batteries. Using the battery in a high temperature environment for a long time may shorten the battery life, because high temperature will accelerate the chemical reaction in the battery, aggravating the loss of electrode materials and the degradation of electrolytes.

[0005] In order to improve the high and low temperature performance of the battery, the following measures can be taken: such as optimizing battery materials and structural design to improve the thermal stability and temperature adaptability of the battery; such as developing electrolytes with high and low temperature performance to improve the battery's conductivity and ion transfer rate at different temperatures; such as designing an effective thermal management system to control the battery operating temperature to prevent overheating or overcooling; such as selecting the appropriate battery type and chemical composition to meet the temperature requirements in specific application environments.

[0006] In summary, the high and low temperature performance of the battery has an important impact on its application in different environments. Therefore, testing and evaluating the working status of the battery under temperature conditions is an important reference for achieving stable and reliable operation of the battery.

[0007] Existing charging and discharging test equipment is connected to the positive and negative poles of the battery through a clamp. Each charging and discharging device contains several to hundreds of such points, which perform charging and discharging tests on single cells respectively. However, almost all test points are in the same temperature environment, and it is impossible to perform temperature environment tests on single cells separately. If a high or low temperature environment is required, the corresponding test points need to be arranged in the corresponding high and low temperature box through extension lines, resulting in shortcomings such as limited temperature environment options, large site occupancy, and high investment in high and low temperature box equipment. Utility Model Content

[0008] The utility model aims to provide a testing device for a test cabinet to perform temperature testing on a battery, which has the characteristics of high temperature control stability, good use flexibility, small size and low cost.

[0009] The utility model can be realized by the following technical solutions:

[0010] The utility model discloses a testing device for a test cabinet to perform temperature testing on a battery, comprising a testing fixture for being electrically connected to a positive electrode and a negative electrode of the battery respectively, the testing fixture being arranged in a temperature box filled with insulating heat-conducting oil, the battery to be tested being built-in and fixed in the temperature box and electrically connected to the testing fixture.

[0011] Furthermore, the side walls of the temperature box are respectively provided with a liquid injection port for injecting insulating heat-conducting oil and a liquid outlet for discharging the non-conductive test page. By providing the liquid injection port and the liquid outlet, a cyclic heat conduction can be formed to maintain the stability of the test environment temperature.

[0012] Furthermore, a temperature sampling line is provided in the temperature box and extends through the box wall to the outside, so as to facilitate temperature sampling at specific sampling points.

[0013] Furthermore, a current sampling line is provided in the temperature box and extends through the box wall to the outside. The current sampling line is electrically connected to the positive and negative electrodes of the battery respectively, so as to facilitate instantaneous sampling of the current.

[0014] Furthermore, the battery to be tested is vertically arranged inside the temperature box, and the outer wall and the inner wall of the temperature box are provided with a test liquid height line, which is lower than the battery's tab connection position to avoid the impact caused by the heat transfer oil overflowing the battery tab.

[0015] Furthermore, the temperature box is an injection-molded plastic box, and the type of the injection-molded plastic is ABS, PP, PE, PET or PVC, which is convenient for injection molding.

[0016] Furthermore, the insulating heat-conducting oil is dibenzyltoluene and or 1,2,3,4-tetralin. In the present invention, the insulating heat-conducting oil can be selected according to the following principles: wide temperature range, good thermal stability, high density, low viscosity, high flash point, and high heat transfer coefficient. Dibenzyltoluene and 1,2,3,4-tetralin can be selected, and their use temperatures are: -60℃~140℃, -35℃~77℃, respectively, which meet the requirements of current test standards.

[0017] Furthermore, the liquid filling port is located at the upper part of the temperature box body, and the liquid outlet is located at the lower part of the temperature box body, forming a circulation flow and improving temperature uniformity.

[0018] Furthermore, the test device can be detachably arranged on the test cabinet, so that it can be used in conjunction with a specific test point and is not affected by the overall ambient temperature.

[0019] Further, the battery to be tested is a soft pack battery or an aluminum shell battery. However, in practice, it is not limited thereto.

[0020] The utility model discloses a testing device for a test cabinet to perform temperature testing on a battery, which has the following beneficial effects:

[0021] First, the temperature stability is high. The test fixture at the test point is surrounded by insulating heat-conducting oil. The test fixture and the battery to be tested are placed in the flow field environment created by the heat-conducting oil at the same time. The flow field heats up or cools down by heating and cooling, so that each set temperature environment remains stable.

[0022] Second, it is highly flexible to use. The temperature box is set up according to the test fixture of a single test point, and the test environment of a single test point is controlled. It is not affected by the overall test environment such as room temperature, and is more flexible.

[0023] Third, the volume is small, and the entire temperature chamber can be combined. The shape and size of the battery to be tested can be selected, and there is no need to use a high and low temperature chamber, saving space and volume;

[0024] Fourth, the equipment investment is low. The temperature is controlled by filling the temperature box with insulating heat-conducting oil. The structure is compact and the processing is simple, and there is no need for additional high and low temperature boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 This is a schematic diagram of the exploded structure of a test device used in a test cabinet to perform temperature testing on a battery according to the utility model;

[0026] The marks in the accompanying drawings include: 100, temperature box; 101, liquid filling port; 102, liquid outlet; 200, battery; 201, tab; 300, test fixture; 301, temperature sampling line; 302, current sampling line. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with embodiments.

[0028] like Figure 1 As shown, the utility model discloses a testing device for a test cabinet to perform temperature testing on a battery, including a test fixture 300 for electrically connecting to the positive and negative electrodes of the battery respectively, the test fixture 300 is arranged in a temperature box 100 filled with insulating thermal oil, and the battery 200 to be tested is built and fixed in the temperature box 100 and electrically connected to the test fixture 300.

[0029] In the present invention, in order to ensure the stability of temperature control and avoid temperature fluctuations, the side walls of the temperature box 100 are respectively provided with a liquid injection port 101 for injecting insulating thermal oil and a liquid outlet 102 for discharging non-conductive test pages. At the same time, the arrangement of the liquid injection port and the liquid outlet also facilitates the replacement of thermal oil. Specifically, the liquid injection port 101 is located at the upper part of the box body of the temperature box 100, and the liquid outlet 102 is located at the lower part of the box body of the temperature box 100.

[0030] In the present invention, in order to realize multi-data collection, it is also necessary to collect temperature and current data instantaneously. Specifically, a temperature sampling line 301 is provided in the temperature box 100 and extends to the outside through the box wall; a current sampling line 302 is provided in the temperature box 100 and extends to the outside through the box wall. The current sampling line 302 is electrically connected to the positive and negative electrodes of the battery 200 respectively.

[0031] In the present invention, in order to avoid the impact of the test process on the battery itself, the battery 200 to be tested is vertically arranged inside the temperature box 100, and the outer wall and inner wall of the temperature box 1 are provided with a test liquid height line (not shown in the figure), and the height line is lower than the connection position of the tab 201 of the battery 200.

[0032] The temperature box and heat transfer oil of the utility model are made of conventional materials in the prior art. For example, the temperature box is an injection-molded plastic box, and the type of the injection-molded plastic is ABS, PP, PE, PET or PVC; and the insulating heat transfer oil is dibenzyltoluene and or 1,2,3,4-tetralin.

[0033] In terms of applicability, the test device can be detachably set on the test cabinet. So as to correspond to the specific test point, the environmental temperature control of the specific point can be achieved. In terms of test applicability, the battery to be tested is a soft-pack battery or an aluminum shell battery, such as lithium iron phosphate battery, lithium manganese oxide battery, lithium cobalt oxide battery, ternary lithium battery, polyanion sodium ion battery, layered oxide sodium ion battery, Prussian blue / white sodium ion battery, etc. can all be tested.

[0034] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The above embodiments are only specific embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these obvious replacement forms all belong to the protection scope of the present invention.

Claims

1. A test device for a test cabinet to perform temperature testing on a battery, comprising a test fixture for electrically connecting to the positive electrode and the negative electrode of the battery respectively, characterized in that: The test fixture is arranged in a temperature box filled with insulating heat-conducting oil, and the battery to be tested is built-in and fixed in the temperature box and electrically connected to the test fixture.

2. The testing device for performing temperature testing on a battery in a testing cabinet according to claim 1, characterized in that: The side walls of the temperature box are respectively provided with a liquid injection port for injecting insulating heat-conducting oil and a liquid outlet for discharging a non-conductive test page.

3. The testing device for performing temperature testing on a battery in a test cabinet according to claim 2, characterized in that: The temperature box is provided with a temperature sampling line which penetrates through the box wall and extends to the outside.

4. The testing device for a test cabinet to perform temperature testing on a battery according to claim 3, characterized in that: The temperature box is provided with a current sampling line which penetrates the box wall and extends to the outside, and the current sampling line is electrically connected to the positive electrode and the negative electrode of the battery respectively.

5. The testing device for a test cabinet to perform temperature testing on a battery according to claim 4, characterized in that: The battery to be tested is vertically arranged inside a temperature box, and the outer wall and the inner wall of the temperature box are provided with a test liquid height line, and the height line is lower than the tab connection position of the battery.

6. The testing device for performing temperature testing on a battery in a testing cabinet according to claim 5, characterized in that: The temperature box is an injection-molded plastic box, and the type of the injection-molded plastic is ABS, PP, PE, PET or PVC.

7. The testing device for a test cabinet to perform temperature testing on a battery according to claim 6, characterized in that: The insulating heat-conducting oil is dibenzyltoluene and / or 1,2,3,4-tetralin.

8. The testing device for a test cabinet to perform temperature testing on a battery according to claim 7, characterized in that: The liquid filling port is located at the upper part of the box body of the temperature box, and the liquid outlet is located at the lower part of the box body of the temperature box.

9. The testing device for a test cabinet to perform temperature testing on a battery according to claim 8, characterized in that: The testing device is detachably arranged on the testing cabinet.

10. The testing device for a test cabinet to perform temperature testing on a battery according to claim 9, characterized in that: The battery to be tested is a soft pack battery or an aluminum case battery.

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