Embedded battery cell test constant temperature device

Abstract

The utility model relates to an embedded battery cell test constant temperature device, which comprises an upper clamping plate, an upper temperature sensor, an upper temperature control Peltier, an upper heat dissipation balance fan, a lower clamping plate, a lower temperature sensor, a lower temperature control Peltier, a lower heat dissipation balance fan and a controller, the upper temperature sensor is inserted into the upper clamping plate, the upper clamping plate is attached to the cold surface of the upper temperature control Peltier, and the lower clamping plate is attached to the cold surface of the lower temperature control Peltier. The upper temperature sensor is inserted into the upper clamping plate, the upper heat dissipation balance fan is attached to the hot face of the upper temperature control Peltier, the lower temperature sensor is inserted into the lower clamping plate, the lower clamping plate is attached to the cold face of the lower temperature control Peltier, and the lower heat dissipation balance fan is attached to the hot face of the lower temperature control Peltier. And the controller is connected with the upper temperature sensor, the upper temperature control Peltier, the upper heat dissipation balance fan, the lower temperature sensor, the lower temperature control Peltier and the lower heat dissipation balance fan, executes temperature control, is arranged in the thermotank large environment, and accurately controls the surface temperature of the measured battery cell.

Description

Technical Field

[0001] The invention relates to a constant temperature device, belonging to the field of new energy, and in particular to an embedded battery cell testing constant temperature device. Background Art

[0002] Battery charge and discharge test is the most intuitive way to judge battery performance. The test results determine whether the battery can be used, whether it needs to be improved, or in what fields it can be used. In the battery charge and discharge test, the tested battery is placed in a constant temperature environment (usually set at -20℃, 0℃, 20℃ and 40℃ to simulate the different ambient temperatures of the actual use environment), and charged to the upper limit voltage of the battery (based on the actual upper limit voltage of the battery); then charged at a constant voltage until the current drops to 0.05 C, and then discharged to the lower limit voltage of the battery at 2 C current. The above steps are repeated as needed (for long-life batteries, it may be necessary to test thousands of times).

[0003] Currently, the charge and discharge test is carried out in a thermostat. The thermostat is set to the target temperature (such as -20°C), and the battery cell is placed in it. After waiting for several hours for the temperature to fully balance, the test is started. When the discharge is finished, the battery will release heat, causing the battery temperature to rise. When tested at -20°C, the battery temperature can even reach above 0°C, but the thermostat cannot sense the temperature change of the battery. Only after the battery changes the internal ambient temperature of the thermostat will the thermostat make temperature compensation. This adjustment process is slow and inaccurate. Because the thermostat is circulated by a fan, the internal temperature is uneven, usually 2-3 degrees, resulting in different actual temperatures of different batteries in different positions.

[0004] In battery testing, the quality of the battery is judged by measuring the internal resistance of the battery. The worse the battery, the more heat it releases (especially at low temperatures), causing the battery temperature to rise, and its measured resistance value will decrease, which has a great negative impact on the battery test. Summary of the invention

[0005] In view of the above-mentioned defects of the existing processing methods, the purpose of the present invention is to provide an embedded battery cell testing constant temperature device, which clamps the battery cell in the middle through a double-layer temperature control clamp, puts it in a constant temperature box, connects it to an external controller, takes the battery surface temperature as the temperature control target, and precisely controls the battery surface temperature so that a single tested battery can accurately reach the set temperature, and quickly compensates when the battery cell temperature changes are monitored, so that the battery cell is always at the set temperature.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An embedded battery cell testing constant temperature device comprises an upper clamping plate (1), an upper temperature sensor (2), an upper temperature control Peltier (3), an upper heat dissipation balancing fan (4), a lower clamping plate (5), a lower temperature sensor (6), a lower temperature control Peltier (7), a lower heat dissipation balancing fan (8) and a controller (9), wherein the upper temperature sensor (2) is inserted into the upper clamping plate (1), the upper clamping plate (1) is in contact with the cold surface of the upper temperature control Peltier (3), the upper heat dissipation balancing fan (4) is in contact with the hot surface of the upper temperature control Peltier (3), and the lower temperature sensor (6) is in contact with the hot surface of the upper temperature control Peltier (3). ) is inserted into the lower clamping plate (5), the lower clamping plate (5) is in contact with the cold surface of the lower temperature control Peltier (7), the lower heat dissipation balancing fan (8) is in contact with the hot surface of the lower temperature control Peltier (7), the controller (9) is connected to the upper temperature sensor (2), the upper temperature control Peltier (3), the upper heat dissipation balancing fan (4), the lower temperature sensor (6), the lower temperature control Peltier (7) and the lower heat dissipation balancing fan (8), and the temperature control Peltier power and the speed of the heat dissipation balancing fan are controlled according to the feedback of the temperature sensor through an adaptive proportional integral differential (PID) algorithm.

[0008] Preferably, the embedded battery cell test constant temperature device can install multiple Peltier and heat dissipation balancing fans on the clamping plate according to the area of ​​the clamping plate to improve temperature control uniformity and power output.

[0009] Preferably, the embedded battery cell test constant temperature device further comprises a multi-channel temperature sensor, which can monitor the temperature of the tested battery cell and multiple positions of the clamping plate.

[0010] Preferably, the controller independently controls the temperature of each side through dual threads, so that both sides of the battery cell maintain the same temperature and are independent of each other without interfering with each other.

[0011] Preferably, the controller quickly detects possible rapid temperature changes of the battery cell by detecting the temperature change slope, and quickly compensates and calls back through an adaptive PID algorithm to keep the battery cell temperature constant. Beneficial Effects

[0012] (1) The present invention realizes precise temperature control of the battery cell under test in a large environment of a constant temperature box, overcoming the problems of large volume of the constant temperature box, large temperature control fluctuations, and uneven internal temperature distribution.

[0013] (2) The present invention can quickly compensate and adjust when the battery cell generates heat, so that the temperature of the battery cell remains constant, thereby avoiding the negative impact of heat release on battery cell evaluation.

[0014] (3) The present invention can use multiple devices at the same time to test multiple temperature points in a constant temperature box environment. For example, if the temperature of the constant temperature box is set at -20°C, three devices of the present invention can be used to test the three temperature points of -25°C, -20°C and -15°C respectively, thereby improving the utilization rate of the constant temperature box. Compared with sequential testing, parallel testing saves test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of Example 1 of the embedded battery cell testing constant temperature device of the present invention.

[0016] In the figure: 1. upper clamping plate, 2. upper temperature sensor, 3. upper temperature control Peltier, 4. upper heat dissipation balancing fan, 5. lower clamping plate, 6. lower temperature sensor, 7. lower temperature control Peltier, 8. lower heat dissipation balancing fan, 9. controller, 10. tested battery cell, 11. constant temperature box. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Example

[0018] like Figure 1 As shown, an embedded battery cell test constant temperature device includes an upper clamping plate, an upper temperature sensor, an upper temperature control Peltier, an upper heat dissipation balancing fan, a lower clamping plate, a lower temperature sensor, a lower temperature control Peltier, a lower heat dissipation balancing fan, and a controller.

[0019] The working procedure of the embedded battery cell test constant temperature device is as follows:

[0020] The thermostat is set to a target temperature, the tested cell is fixed with the assembled upper clamp (1) and lower clamp (5), and placed in the thermostat, the upper temperature sensor (2), the upper temperature control Peltier (3), the upper heat dissipation balance fan (4), the lower temperature sensor (6), the lower temperature control Peltier (7) and the lower heat dissipation balance fan (8) are connected to the controller (9), the thermostat is started, and after the temperature of the thermostat is stabilized, the controller (9) is set to the target temperature and the temperature control is started.

Claims

1. An embedded battery cell test constant temperature device, characterized in that: The invention comprises an upper clamping plate (1), an upper temperature sensor (2), an upper temperature control Peltier (3), an upper heat dissipation balancing fan (4), a lower clamping plate (5), a lower temperature sensor (6), a lower temperature control Peltier (7), a lower heat dissipation balancing fan (8) and a controller (9), wherein the upper temperature sensor (2) is inserted into the upper clamping plate (1), the upper clamping plate (1) is bonded to the cold surface of the upper temperature control Peltier (3), the upper heat dissipation balancing fan (4) is bonded to the hot surface of the upper temperature control Peltier (3), the lower temperature sensor (6) is inserted into the lower clamping plate (5), the lower clamping plate (5) is bonded to the cold surface of the lower temperature control Peltier (7), the lower heat dissipation balancing fan (8) is bonded to the hot surface of the lower temperature control Peltier (7), and the controller (9) is connected to the upper temperature sensor (2), the upper temperature control Peltier (3), the upper heat dissipation balancing fan (4), the lower temperature sensor (6), the lower temperature control Peltier (7) and the lower heat dissipation balancing fan (8) to perform temperature control.

2. The embedded battery cell testing constant temperature device according to claim 1, characterized in that: The embedded battery cell testing constant temperature device also includes a multi-channel temperature sensor, which can monitor the temperature of multiple positions of the tested battery cell and the clamping plate.

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