A water-cooled button battery temperature control test device

Abstract

A button battery temperature control and testing device with water cooling and heat dissipation comprises 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; a heat dissipation monitoring module of the temperature controller monitors the flow rate and temperature state of the cooling circulating water flowing through the positive and negative water-cooled heads in the temperature control chamber; a refrigeration plate control module of the temperature controller is connected to the positive and negative refrigeration plates of the temperature control chamber, and controls the positive and negative refrigeration plates to work in a cooling mode or a heating mode by changing the direction of the current; the refrigeration plate control module communicates with the heat dissipation monitoring module of the temperature controller, and when the heat dissipation monitoring module detects that the flow rate or temperature of the circulating water is abnormal, the refrigeration plate control module stops supplying power to the positive and negative refrigeration plates; the temperature sensing module of the temperature controller is connected to the positive and negative temperature sensors, and communicates with the refrigeration plate control module, and compares whether the measured temperature is the same as the set value, and the control module starts or stops the refrigeration plate; the present invention has the advantages of small size, low cost, and accurate and stable temperature control.

Description

Technical Field

[0001] The invention relates to the technical field of battery testing, and in particular to a button battery temperature control testing device with water cooling and heat dissipation. Background Art

[0002] 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. They are widely used in electric vehicles, power tools, and grid energy storage. The only drawback is that the electrode materials, electrolytes, and diaphragms that make up lithium-ion batteries can usually only work in a narrow temperature window, and exceeding their temperature window will cause serious damage. For example, when working at a lower temperature, the negative electrode will undergo severe lithium precipitation, and the resulting lithium dendrites may pierce the diaphragm, causing an internal short circuit; under high temperature conditions, the electrode material may undergo a phase change, the electrolyte may volatilize or oxidize, and the diaphragm may fail. However, lithium-ion batteries need to be applicable to a wider temperature range in their applications. For example, in electric vehicles in extremely cold areas, the battery needs to be able to maintain sufficient power at -20°C; while in tropical areas, or when the battery itself heats up during operation, the battery is required to maintain normal operation at a temperature of +50°C. Therefore, the study of the temperature characteristics of lithium-ion batteries is of great practical significance for their practical applications.

[0003] In the laboratory, the most commonly used method to test the performance of lithium batteries is to test lithium-ion button batteries by trial production. This method has simple process, low cost and short cycle. In the existing technical solutions, the temperature test of button batteries has always been carried out by placing button batteries in a large constant temperature chamber. The constant temperature chamber usually uses a compressor and cold air to cool down. The constant temperature chamber is expensive, bulky, slow to adjust the temperature, and has high requirements for use, resulting in low test efficiency and inconvenience in actual use. Therefore, a comparative investigation is conducted on the temperature test problem of button batteries. Through keyword retrieval, the patent listed in patent number CN105700587A belongs to the constant temperature chamber test type and cannot solve the existing problems; the lithium ion temperature control device shown in patent CN103487761 is actually just a lithium ion battery temperature sensing chamber, and cannot achieve real-time temperature control; the contents contained in CN107887672 and CN206180060 are a control strategy for battery thermal management, not a temperature control device for button batteries.

[0004] In small-scale temperature control, especially small-scale refrigeration, semiconductor refrigeration chips are suitable technical means. Semiconductor refrigeration chips are also called thermoelectric refrigeration chips. They are divided into cold side and hot side. After power on, a temperature difference of about 40°C can be achieved on both sides. Continuous power on produces an effect similar to heat transfer. By changing the direction of the current, one side of the refrigeration chip can be controlled to heat or cool. Regarding 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 require power on 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 battery by the device is complicated and difficult to implement; the set insulation layer actually causes distortion of the battery temperature measurement; the device has no insulation measures, so the temperature is difficult to reduce and maintain; and there is no heat dissipation protection for the refrigeration chip, which is prone to damage, so the overall practicality of the device is not strong. Therefore, it is necessary to design a button battery testing device with high efficiency, small size, wide temperature control range, accurate and stable temperature control, and simple and easy testing. Summary of the invention

[0005] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a button battery temperature control testing device with water cooling and heat dissipation, which has the characteristics of small size, low cost, accurate and stable temperature control, wide temperature range, easy electrical testing, and high working stability. By using water cooling and heat dissipation, the button battery electrode shell can be kept at a temperature of -30℃~60℃ or even wider, and a large temperature difference can be achieved between the positive and negative electrode shells of the button battery.

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] A water-cooled button battery temperature control test device comprises a temperature controller 1 and a temperature control chamber; 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;

[0008] The main part of the positive temperature control chamber 2 is composed of a positive water cooling head water inlet / outlet 2-1, a positive water cooling head 2-2, a positive cooling sheet 2-3 and a positive cold storage block 2-4 from outside to inside; the cold surface of the positive cooling sheet 2-3 is bonded to the positive cold storage block 2-4 by thermal conductive silicone grease, and the hot surface of the positive cooling sheet 2-3 is bonded to the surface of the positive water cooling head 2-2 by thermal conductive silicone grease, and a positive temperature sensor 2-7 and a positive electrical signal test point 2-8 are arranged on the side of the positive cold storage block 2-4;

[0009] The main part of the negative electrode temperature control cavity 3 is composed of a negative electrode water cooling head water inlet / outlet 3-1, a negative electrode water cooling head 3-2, a negative electrode cooling sheet 3-3 and a negative electrode cold storage block 3-4 from outside to inside; the cold surface of the negative electrode cooling sheet 3-3 is bonded to the negative electrode cold storage block 3-4 through thermal conductive silicone grease, and the hot surface of the negative electrode cooling sheet 3-3 is bonded to the surface of the negative electrode water cooling head 3-2 through thermal conductive silicone grease, and 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;

[0010] The temperature controller 1 includes a refrigeration plate 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 monitors the flow rate and temperature state of the cooling circulating water flowing through the positive and negative water cooling heads 2-2, 3-2; the refrigeration plate control module 1-1 is connected to the positive and negative refrigeration plate 2-3, 3-3 pins of the temperature control cavity through a control line; the refrigeration plate control module 1-1 communicates with the heat dissipation monitoring module 1-3; the acquisition line of the temperature sensing module 1-2 is connected to the pins of the positive and negative temperature 2-7, 3-7 sensors of the temperature control cavity, and communicates with the refrigeration plate control module 1-1.

[0011] The positive electrode cold storage blocks 2-4 are made of metal materials with good thermal conductivity and electrical conductivity, including but not limited to copper and aluminum materials.

[0012] There is a 1 mm depression on the surface of the positive electrode cold storage block 2-4, and a 1 mm protrusion on the surface of the negative electrode cold storage block 3-4. Button batteries 4 to be tested of various sizes are installed between the two cold storage blocks.

[0013] A heat-insulating layer 5 is also provided between the positive electrode cold storage block 2 - 4 and the negative electrode cold storage block 3 - 4 .

[0014] The outer layer of the main body of the temperature control chamber is provided with positive and negative insulation layers 2-5, 3-5.

[0015] Positive and negative outer shell layers 2-6, 3-6 are arranged outside the positive and negative heat preservation layers 2-5, 3-5, and mounting holes are arranged on the positive and negative outer shell layers 2-6, 3-6 for fixing and installing the whole device.

[0016] The positive and negative electrode cooling sheets 2-3, 3-3 have a side length of 4 cm and a thickness of 5 mm.

[0017] Advantages of the present invention:

[0018] The side length of the cooling plate is only in the order of centimeters, the required chamber is very small, and it has the ability to heat and cool at the same time. Compared with the traditional lithium-ion battery cell test device, the test device designed with the cooling plate of the present invention is compact, efficient, and has more accurate and easy-to-implement temperature control. The measurement of battery performance is also more direct and accurate. The heat dissipation monitoring function can effectively protect the cooling plate and prevent overheating damage. The device has better safety and stability, and a stable -30℃ test environment can be achieved by circulating water alone. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 It is a cross-sectional schematic diagram of the temperature control chamber of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Reference Figure 1 A water-cooled button battery temperature control test device comprises a temperature controller 1 and a temperature control chamber.

[0023] Reference Figure 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.

[0024] The main parts of the positive temperature control chamber 2 are, from outside to inside, the positive water cooling head inlet / outlet 2-1, the positive water cooling head 2-2, the positive cooling sheet 2-3 and the positive cold storage block 2-4; the cold surface of the positive cooling sheet 2-3 is bonded to the positive cold storage block 2-4 by thermal conductive silicone grease, and the hot surface of the positive cooling sheet 2-3 is bonded to the surface of the positive water cooling head 2-2 by thermal conductive silicone grease. The cooling circulating water flows through the water cooling head inlet / outlet 2-1 to take away the heat of the water cooling head 2-2. A positive temperature sensor 2-7 and a positive electrical signal test point 2-8 are arranged on the side of the positive cold storage block 2-4.

[0025] The structure of the negative electrode temperature control cavity 3 is the same as that of the positive electrode temperature control cavity 2, that is, the main part is composed of the negative electrode water cooling head inlet / outlet 3-1, the negative electrode water cooling head 3-2, the negative electrode refrigeration plate 3-3 and the negative electrode cold storage block 3-4 from the outside to the inside; the cold surface of the negative electrode refrigeration plate 3-3 is bonded to the negative electrode cold storage block 3-4 by thermal conductive silicone grease, and the hot surface of the negative electrode refrigeration plate 3-3 is bonded to the surface of the negative electrode water cooling head 3-2 by thermal conductive silicone grease, and 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.

[0026] The temperature controller 1 includes a cooling plate 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 monitors the flow rate and temperature state of the cooling circulating water flowing through the positive and negative water cooling heads 2-2, 3-2; the cooling plate control module 1-1 is connected to the positive and negative cooling plates 2-3, 3-3 pins of the temperature control cavity through a control line, and controls the positive and negative cooling plates 2-3, 3-3 to work in cooling mode or heating mode by changing the current direction; the cooling plate control module 1- 1 communicates with the heat dissipation monitoring module 1-3. When the heat dissipation monitoring module 1-3 detects that the flow rate or temperature of the circulating water is abnormal, the refrigeration plate control module 1-1 stops supplying power to the positive and negative refrigeration plates 2-3, 3-3; the acquisition line of the temperature sensing module 1-2 is connected to the pins of the positive and negative temperature sensors 2-7, 3-7 of the temperature control chamber, and communicates with the refrigeration plate control module 1-1 to compare whether the measured temperature is the same as the set value, and then the control module 1-1 starts or stops the operation of the refrigeration plates 2-3, 3-3.

[0027] The positive electrode cold storage block 2-4 is made of metal materials with good thermal conductivity and electrical conductivity, including but not limited to copper and aluminum materials. The positive electrode cold storage block 2-4 plays three roles. First, it evenly transfers the temperature of the cold surface of the positive electrode refrigeration plate 2-3 to the shell of the button battery 4 to be tested, so that the temperature distribution is more uniform and the temperature change is smooth; second, the positive electrode cold storage block 2-4 is preset with a temperature sensor 1-2 installation port. Since the temperature of the positive electrode cold storage block 2-4 is consistent with that of the shell of the button battery 4 to be tested, the temperature of the shell of the button battery 4 to be tested can be accurately measured by measuring the temperature of the positive electrode cold storage block 2-4; third, as a test electrode of the button battery 4 to be tested, it has good electrical contact with the shell of the button battery 4 to be tested by pressing, and the electrical signal test line can be directly attached to the positive electrode cold storage block 2-4.

[0028] There is a 1 mm depression on the surface of the positive electrode cold storage block 2-4, and there is a 1 mm protrusion on the surface of the negative electrode cold storage block 3-4. Button batteries 4 to be tested of various sizes are installed between the two cold storage blocks.

[0029] A heat preservation layer 5 is also provided between the positive electrode cold storage block 2-4 and the negative electrode cold storage block 3-4, so that the temperature of the positive and negative electrode shells can be set independently.

[0030] Positive and negative insulation layers 2-5, 3-5 are arranged on the outer layer of the main body of the temperature control chamber to reduce the heat transfer between the test chamber and the outside.

[0031] Positive and negative outer shell layers 2-6, 3-6 are arranged outside the positive and negative heat preservation layers 2-5, 3-5, and mounting holes are arranged on the positive and negative outer shell layers 2-6, 3-6 for fixing and installing the whole device.

[0032] The positive and negative electrode cooling sheets 2-3, 3-3 have a side length of 4 cm and a thickness of 5 mm.

[0033] The working principle of the present invention is as follows: 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 recessed platform of the positive cold storage block 2-4, and then cover the negative temperature control chamber on it, so that the protruding platform of the negative cold storage block 3-4 of the negative temperature control chamber fits with the negative electrode of the battery, tighten the upper and lower fixing screws, and the sponge foam type insulation layer 5 can be pressed to different heights according to the thickness of the battery to complete the installation.

[0034] Turn on the thermostat 1, read the temperature value of the cold storage block of the positive and negative electrodes, set the required refrigeration plate temperature, turn on the circulating water and set the appropriate temperature, the cooling water flows through the positive and negative water cooling heads 2-2, 3-2, and after the heat dissipation monitoring module 1-3 is normal, the positive and negative refrigeration plates 2-3, 3-3 also start working. It has been proved through actual use that the device can achieve a low temperature of -30°C at an ambient operating temperature of 25°C. Since there is an insulation layer between the positive and negative electrodes, the temperature difference between the positive and negative electrodes of the button battery can also be achieved, which is used to study the different sensitivities of the positive and negative electrode materials to temperature respectively, which is impossible to achieve with many chamber temperature control. After the temperature of the button battery is stable, the performance of the button battery at a specific temperature can be measured through the four-electrode battery test line 2-8, 3-8.

Claims

1. A water-cooled button battery temperature control test device, characterized in that: It comprises 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 temperature control chamber (3) having the same structure; The main body of the positive electrode temperature control chamber (2) is composed of a positive electrode water cooling head water inlet / outlet (2-1), a positive electrode water cooling head (2-2), a positive electrode cooling sheet (2-3) and a positive electrode cold storage block (2-4) from the outside to the inside; the cold surface of the positive electrode cooling sheet (2-3) is bonded to the positive electrode cold storage block (2-4) by thermal conductive silicone grease, and the hot surface of the positive electrode cooling sheet (2-3) is bonded to the surface of the positive electrode water cooling head (2-2) by thermal conductive silicone grease; 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 main body of the negative electrode temperature control chamber (3) is composed of a negative electrode water cooling head water inlet / outlet (3-1), a negative electrode water cooling head (3-2), a negative electrode cooling sheet (3-3) and a negative electrode cold storage block (3-4) from the outside to the inside; the cold surface of the negative electrode cooling sheet (3-3) is bonded to the negative electrode cold storage block (3-4) through thermal conductive silicone grease, and the hot surface of the negative electrode cooling sheet (3-3) is bonded to the surface of the negative electrode water cooling head (3-2) through thermal conductive silicone grease; 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) comprises a refrigeration plate 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) monitors the flow rate and temperature state of the cooling circulating water flowing through the positive and negative water cooling heads (2-2, 3-2); the refrigeration plate control module (1-1) is connected to the positive and negative refrigeration plate (2-3, 3-3) pins of the temperature control cavity via a control line; the refrigeration plate control module (1-1) communicates with the heat dissipation monitoring module (1-3); the collection line of the temperature sensing module (1-2) is connected to the pins of the positive and negative temperature sensors (2-7, 3-7) of the temperature control cavity, and communicates with the refrigeration plate control module (1-1); The surface of the positive electrode cold storage block (2-4) has a 1 mm depression, the surface of the negative electrode cold storage block (3-4) has a 1 mm protrusion, and button batteries (4) to be tested of various sizes are installed between the two cold storage blocks; A heat preservation layer (5) is also provided between the positive electrode cold storage block (2-4) and the negative electrode cold storage block (3-4).

2. A water-cooled button battery temperature control test device according to claim 1, characterized in that: Positive and negative heat-insulating layers (2-5, 3-5) are arranged on the outer layer of the main body of the temperature-control chamber.

3. A water-cooled button battery temperature control test device according to claim 2, characterized in that: Positive and negative outer shell layers (2-6, 3-6) are arranged outside the positive and negative heat-insulating layers (2-5, 3-5), and mounting holes are arranged on the positive and negative outer shell layers (2-6, 3-6) for fixing and mounting the entire device.

4. A water-cooled button battery temperature control test device according to claim 1, characterized in that: The positive and negative electrode cooling sheets (2-3, 3-3) have a side length of 4 cm and a thickness of 5 mm.

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