CN212008861U - Fan cooling button battery temperature control test device - Google Patents

Abstract

Fan cooling button battery temperature control test device, including a temperature controller and a temperature control chamber; the temperature control chamber is divided into positive and negative temperature control chambers with the same structure; the main part of the temperature control chamber is positive and negative in turn from outside to inside. Fan, positive and negative fan cooling blocks, positive and negative cooling sheets, and positive and negative cooling blocks; the thermostat includes a cooling sheet control module, a temperature sensing module and a cooling monitoring module; the cooling monitoring module is connected to the positive and negative cooling fans of the temperature control cavity. Power supply; the cooling chip control module is connected to the positive and negative cooling chips, and controls the positive and negative cooling chips to work in cooling mode or heating mode by changing the current direction; when the heat dissipation monitoring module detects that the fan current is abnormal, it stops supplying power to the cooling chip; temperature sensing The module is connected with the positive and negative temperature sensors, and communicates with the refrigerating sheet control module to compare whether the measured temperature is the same as the set value, and then the control module starts or stops the work of the positive and negative refrigerating sheets; the utility model is small in size and accurate in temperature control Stablize.

Description

Fan cooling button battery temperature control test device

technical field

The utility model relates to the technical field of battery testing, in particular to a temperature control testing device for a fan cooling button battery.

Background technique

In the rapidly developing new energy field, lithium-ion batteries stand out from many types of secondary batteries due to their high specific energy characteristics and become a popular energy storage device. range application. The fly in the ointment is that the electrode materials, electrolytes and separators that make up lithium-ion batteries usually only work in a narrow temperature window, beyond which it will cause serious damage. For example, when working at a lower temperature, serious lithium precipitation will occur in the negative electrode, and the generated lithium dendrites may pierce the separator, resulting in an internal short circuit; at high temperature, the electrode material may undergo a phase change, and the electrolyte may volatilize or oxidize , the diaphragm may fail. However, the application of lithium-ion batteries needs to be able to apply to a wide temperature range. For example, in an electric vehicle in an extremely cold region, the battery needs to be able to maintain sufficient power at -20 °C; in tropical regions, or the battery itself generates heat during operation, the battery is required to maintain normal operation at a temperature of +50 °C. Therefore, the research on the temperature characteristics of lithium-ion batteries has important practical significance for its practical application.

In the laboratory, the most commonly used way to test the performance of lithium batteries is to test lithium-ion button batteries, which is simple in process, low in cost and short in cycle. In the existing technical solutions, the temperature test of the button battery has been carried out by placing the button battery in a large constant temperature chamber. The constant temperature chamber usually uses a compressor and cold air to cool down. It is slow and has high usage requirements, resulting in low test efficiency and inconvenience to actual use. Therefore, a comparative investigation is carried out on the temperature test problem of button batteries. Through keyword search, the patents listed in the patent number CN105700587A belong to the type of constant temperature chamber test and cannot solve the existing problems; the lithium ion temperature control device shown in the patent CN103487761, the actual The above is only a temperature sensing chamber for lithium-ion batteries, and cannot realize real-time temperature control; the content contained in CN107887672 and CN206180060 is a control strategy for battery thermal management, not a temperature control device for button batteries.

In small-scale temperature control, especially in small-scale refrigeration, semiconductor refrigeration sheet is a suitable technical means. Semiconductor refrigeration sheet, also known as thermoelectric refrigeration sheet, is divided into cold side and hot side. The temperature difference, continuous energization produces an effect similar to heat transfer, and the direction of the current is changed, which can control the heating or cooling of the cooling sheet on one side. For the application of semiconductor refrigeration chips in related fields, such as CN106486719A, it is a power battery control system based on semiconductor refrigeration chips, but it is not used for button battery testing. CN203689188U is a refrigeration device for semiconductor devices, but it does not need to energize the semiconductor material, and only needs to control the temperature of the material to be tested on one side, and cannot be used for button battery testing. The device described in CN106876824 has achieved certain improvements, but the electrical test of the device on the battery is complicated and difficult to achieve; the insulating layer provided will actually cause the temperature measurement of the battery to be distorted; the device has no heat preservation measures, so the temperature is difficult to reduce and maintain; and There is no heat dissipation protection for the cooling sheet, which is prone to damage, so the overall practicability of the device is not strong. Therefore, it is necessary to design a button battery test device with high efficiency, small size, wide temperature control range, accurate and stable temperature control, and easy testing.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned defects of the prior art, the purpose of the present invention is to provide a fan cooling button battery temperature control test device, which has the advantages of small size, low cost, accurate and stable temperature control, wide temperature range, easy electrical testing, and working stability. High features, the use of fans to dissipate heat, the electrode shell of the button battery can be maintained at a temperature of 0 ° C ~ 60 ° C or even wider without other auxiliary equipment, and a large temperature difference can be achieved between the positive and negative electrode shells of the button battery. .

In order to achieve the above object, the technical scheme of the present utility model is:

The fan cooling button battery temperature control test device includes two parts: a temperature controller 1 and a temperature control chamber; the temperature control chamber is divided into a positive temperature control chamber 2 and a negative electrode temperature control chamber 3 with the same structure;

The main body of the positive temperature control cavity 2 is sequentially composed of a positive cooling fan 2-1, a positive fan cooling block 2-2, a positive cooling piece 2-3 and a positive cooling block 2-4 from the outside to the inside; the positive cooling piece The cold side of 2-3 is bonded to the positive cooling block 2-4 through thermal grease, and the hot side of the positive cooling sheet 2-3 is bonded to the cooling block 2-2 of the positive fan through thermal grease, on the side of the positive cooling block 2-4. The side is provided with a positive temperature sensor 2-7 and a positive electrical signal test point 2-8;

The main part of the negative temperature control body cavity 3 is, from the outside to the inside, the negative cooling fan 3-1, the negative fan cooling block 3-2, the negative cooling sheet 3-3 and the negative cold storage block 3-4; -4 side is provided with negative temperature sensor 3-7 and negative electrical signal test point 3-8;

The temperature controller 1 includes a cooling chip control module 1-1, a temperature sensing module 1-2 and a heat dissipation monitoring module 1-3; the heat dissipation monitoring module 1-3 is connected to the positive and negative cooling fans 2-1, 3 of the temperature control chamber. The -1 pin powers it and monitors the current on the cooling fan;

The cooling chip control module 1-1 is connected to the positive and negative cooling chips 2-3 and 3-3 pins of the temperature control cavity through the control wire, and controls the positive and negative cooling chips 2-3 and 3-3 to work as cooling by changing the current direction. mode or heating mode;

The cooling chip control module 1-1 communicates with the heat dissipation monitoring module 1-3. When the heat dissipation monitoring module 1-3 detects that the fan current is abnormal, the cooling chip control module 1-1 stops supplying power to the cooling chips 2-3 and 3-3;

The acquisition line of the temperature sensing module 1-2 is connected with the pins of the positive and negative temperature sensors 2-7 and 3-7 of the temperature control chamber, and communicates with the refrigeration chip control module 1-1 to compare the measured temperature with the set value If it is the same, then the control module 1-1 starts or stops the work of the positive and negative refrigerating pieces 2-3 and 3-3.

The positive regenerator blocks 2-4 are made of metal materials with good thermal conductivity and electrical conductivity, including but not limited to copper and aluminum materials.

The surface of the positive cold storage block 2-4 has a depression of 1 mm, and the surface of the negative cold storage block 3-4 has a protrusion of about 1 mm. Various sizes of button batteries 4 to be tested are installed between the two cold storage blocks.

A thermal insulation layer 5 is further arranged between the positive electrode cold storage block 2-4 and the negative electrode cold storage block 3-4.

Positive and negative thermal insulation layers 2-5 and 3-5 are arranged on the outer layer of the main body part of the temperature control chamber.

The positive and negative thermal insulation layers 2-5 and 3-5 are provided with positive and negative outer shell layers 2-6 and 3-6, and the positive and negative outer shell layers 2-6 and 3-6 are provided with mounting holes for the installation of the device as a whole. Fixed installation.

The positive and negative refrigerating sheets 2-3 and 3-3 have a side length of 4 cm and a thickness of 5 mm.

The advantages of the utility model: the side length of the refrigerating sheet is only in the order of centimeters, the required chamber is very small, and it has the ability of heating and cooling at the same time. Compared with the core testing device, it is small in size, high in efficiency, more accurate in temperature control and easy to implement. The set heat dissipation monitoring function can effectively protect the cooling film, prevent overheating damage, the device is safer and the test is more stable, the use of cooling fans to dissipate heat does not need to rely on other cooling accessories, such as circulating cooling water, compressors, etc. To achieve better temperature control effect.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

2 is a schematic cross-sectional view of the temperature control cavity of the present invention.

Detailed ways

The present utility model will be further introduced below in conjunction with the accompanying drawings.

Referring to FIG. 1 , the fan cooling button battery temperature control test device includes two parts: a thermostat 1 and a temperature control chamber.

Referring to FIG. 2 , the temperature control chamber is divided into a positive electrode temperature control chamber 2 and a negative electrode temperature control chamber 3 with the same structure.

The main body of the positive temperature control cavity 2 is sequentially composed of a positive cooling fan 2-1, a positive fan cooling block 2-2, a positive cooling piece 2-3 and a positive cooling block 2-4 from the outside to the inside; the positive cooling piece The cold side of 2-3 is bonded to the positive cooling block 2-4 through thermal grease, and the hot side of the positive cooling sheet 2-3 is bonded to the cooling block 2-2 of the positive fan through the thermal grease, and the outside of the cooling block 2-2 of the positive fan is It is the positive cooling fan 2-1. In this setting, the cooling fan 2-1 and the fan cooling block 2-2 work together to quickly take away the heat of the hot surface of the positive cooling sheet 2-3 when it is working, so as to ensure that the positive cooling sheet 2- 3 works fine. A positive electrode temperature sensor 2-7 and a positive electrode electrical signal test point 2-8 are arranged on the side of the positive electrode cold storage block 2-4.

The structure of the negative temperature control chamber 3 is the same as that of the positive temperature control chamber 2, that is, the main part is followed by a negative electrode cooling fan 3-1, a negative fan cooling block 3-2, a negative cooling sheet 3-3 and a negative cooling block from the outside to the inside. 3-4; A negative electrode temperature sensor 3-7 and a negative electrode electrical signal test point 3-8 are arranged on the side of the negative electrode cold storage block 3-4.

The temperature controller 1 includes a cooling chip control module 1-1, a temperature sensing module 1-2 and a heat dissipation monitoring module 1-3; the heat dissipation monitoring module 1-3 is connected to the positive and negative cooling fans 2-1, 3 of the temperature control chamber. The -1 pin supplies power to it and monitors the current on the cooling fan; the cooling chip control module 1-1 is connected to the positive and negative cooling chips 2-3 and 3-3 pins of the temperature control cavity through the control line, and the current is converted by Direction control positive and negative cooling chips 2-3, 3-3 work in cooling mode or heating mode; cooling chip control module 1-1 communicates with heat dissipation monitoring module 1-3, when heat dissipation monitoring module 1-3 detects that the fan current is abnormal When the cooling chip control module 1-1 stops supplying power to the cooling chips 2-3 and 3-3; It is connected with the refrigerating chip control module 1-1, and the measured temperature is compared with the set value, and then the control module 1-1 starts or stops the positive and negative refrigerating chips 2-3 and 3-3 to work; the The positive regenerator blocks 2-4 are made of metal materials with good thermal conductivity and electrical conductivity, including but not limited to copper and aluminum materials. The positive cold storage block 2-4 has three functions. One is to uniformly conduct the temperature of the cold surface of the positive refrigeration sheet 2-3 to the shell of the button battery 4 to be tested, so as to make the temperature distribution more uniform and smooth the temperature change; 2. The installation port of temperature sensor 1-2 is preset on the positive cold storage block 2-4. Since the temperature of the positive cold storage block 2-4 is consistent with the shell temperature of the button battery 4 to be tested, by measuring the temperature of the positive cold storage block 2-4, The temperature of the shell of the button battery 4 to be tested can be accurately measured; the third is as the test electrode of the button battery 4 to be tested, which has good electrical contact with the shell of the button battery 4 to be tested by pressing, and can directly The signal test line is supported on the positive cold storage block 2-4.

The surface of the positive cold storage block 2-4 has a depression of 1 mm, and the surface of the negative cold storage block 3-4 has a protrusion of about 1 mm. Various sizes of button batteries 4 to be tested are installed between the two cold storage blocks.

A thermal insulation layer 5 is also provided between the positive cold storage block 2-4 and the negative cold storage block 3-4, and the temperature of the positive and negative electrode shells can be independently set.

Positive and negative thermal insulation layers 2-5 and 3-5 are arranged on the outer layer of the main part of the temperature control chamber to reduce the heat transfer between the test chamber and the outside world.

There are positive and negative outer shell layers 2-6, 3-6 outside the positive and negative insulation layers 2-5, 3-5, and mounting holes are provided on the positive and negative outer shell layers 2-6, 3-6 for fixing the whole device Install.

The positive and negative refrigerating sheets 2-3 and 3-3 have a side length of 4 cm and a thickness of 5 mm.

The working principle of the present utility model:

When in use, open the positive temperature control chamber 2 and the negative temperature control chamber 3, fit the positive electrode of the button battery 4 to be tested with the concave platform of the positive electrode cold storage block 2-4, and then cover the negative electrode temperature control chamber on it, so that the The protruding platform of the negative cold storage block 3-4 of the negative temperature control chamber is attached to the negative electrode of the battery, and the upper and lower fixing screws are tightened. The foam insulation layer 5 can be pressed to different heights according to the thickness of the battery. finish installation.

Turn on the thermostat 1, read the temperature value of the positive and negative cold storage blocks, and at the same time, the heat dissipation monitoring 1-3 drives and monitors the operation of the cooling fan. When the positive and negative cooling fans 2-1 and 3-1 work normally, set the For the temperature value to be measured, the refrigerator control module 1-1 compares the set value with the actual value, and drives the positive and negative cooling plates 2-3, 3-3 is the cooling mode or the cooling mode. When the temperature in the temperature control chamber is stable near the set value, the battery testing equipment can be used to measure the electrical performance of the lithium ion button battery 4 at the set temperature. It has been proved by actual use that when the external ambient temperature is 20°C, the device can stably achieve a low temperature test environment of 0°C to a high temperature test environment of 50°C in a temperature control chamber.

Claims (7)

1. The temperature control testing device for the fan heat dissipation button battery is characterized by comprising a temperature controller (1) and a temperature control chamber; the temperature control chamber is divided into a positive temperature control cavity (2) and a negative temperature control cavity (3) which have the same structure;

the main body part of the positive temperature control cavity (2) is sequentially provided with a positive cooling fan (2-1), a positive fan cooling block (2-2), a positive refrigerating sheet (2-3) and a positive cold storage block (2-4) from outside to inside; the cold surface of the positive refrigeration piece (2-3) is bonded with the positive cold storage block (2-4) through heat conduction silicone grease, the hot surface of the positive refrigeration piece (2-3) is bonded with the positive fan radiating block (2-2) through heat conduction silicone grease, and a positive temperature sensor (2-7) and a positive electrical signal test point (2-8) are arranged on the side edge of the positive cold storage block (2-4);

the main body part of the negative temperature control cavity (3) is sequentially provided with a negative heat radiation fan (3-1), a negative fan heat radiation block (3-2), a negative refrigeration sheet (3-3) and a negative cold storage block (3-4) from outside to inside; a negative temperature sensor (3-7) and a negative electrical signal test point (3-8) are arranged on the side of the negative cold storage block (3-4);

the temperature controller (1) comprises a refrigerating sheet control module (1-1), a temperature sensing module (1-2) and a heat dissipation monitoring module (1-3); the heat dissipation monitoring module (1-3) is connected with pins of a positive heat dissipation fan (2-1) and a negative heat dissipation fan (3-1) of the temperature control cavity to supply power to the temperature control cavity, and monitors the current on the heat dissipation fans;

the refrigerating piece control module (1-1) is connected with a positive refrigerating piece (2-3) and a negative refrigerating piece (3-3) pin of the temperature control cavity through control lines, and controls the positive refrigerating piece (2-3) and the negative refrigerating piece (3-3) to work in a refrigerating mode or a heating mode by changing the current direction;

the refrigerating piece control module (1-1) is communicated with the heat dissipation monitoring module (1-3), and when the heat dissipation monitoring module (1-3) monitors that the fan current is abnormal, the refrigerating piece control module (1-1) stops supplying power to the positive refrigerating piece (2-3) and the negative refrigerating piece (3-3);

an acquisition line of the temperature sensing module (1-2) is connected with pins of positive and negative temperature sensors (2-7, 3-7) of the temperature control cavity, and is communicated with the refrigerating sheet control module (1-1), whether the measured temperature is the same as a set value or not is compared, and then the control module (1-1) starts or stops the positive refrigerating sheet (2-3) and the negative refrigerating sheet (3-3) to work.

2. The temperature control testing device for the button battery with the fan heat dissipation function as claimed in claim 1, wherein the positive cold storage block (2-4) is made of a metal material with good heat conductivity and electric conductivity, including but not limited to copper and aluminum.

3. The temperature control testing device for the button battery with the fan heat dissipation function according to claim 1, wherein the surface of the positive cold storage block (2-4) is provided with a 1mm depression, the surface of the negative cold storage block (3-4) is provided with a 1mm protrusion, and the button batteries (4) to be tested with various sizes are arranged between the two cold storage blocks.

4. The temperature control testing device for the button battery with the fan heat dissipation function according to claim 1, wherein an insulating layer (5) is further arranged between the positive pole cold storage blocks (2-4) and the negative pole cold storage blocks (3-4).

5. The temperature control testing device for the button battery with the fan heat dissipation function according to claim 1, wherein a positive heat insulation layer (2-5) and a negative heat insulation layer (3-5) are arranged on the outer layer of the main body part of the temperature control chamber.

6. The temperature control testing device for the button battery with the fan heat dissipation function according to claim 5, wherein a positive shell layer (2-6) and a negative shell layer (3-6) are arranged outside the positive heat insulation layer (2-5) and the negative heat insulation layer (3-5), and mounting holes are formed in the positive shell layer (2-6) and the negative shell layer (3-6) and used for fixedly mounting the whole device.

7. The temperature control testing device for the button battery with the fan heat dissipation function according to claim 1, wherein the side length of the positive refrigeration piece (2-3) and the side length of the negative refrigeration piece (3-3) are 4 cm, and the thickness of the positive refrigeration piece and the negative refrigeration piece is 5 mm.

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