Temperature probe automatic calibration device and battery capacity grading formation mechanism

Abstract

The invention provides a temperature probe automatic calibration device and a battery capacity grading formation mechanism, the calibration device comprises a containing box, the containing box can be in butt joint with a restraining tray placing position in the battery capacity grading formation mechanism, a supporting frame is arranged in the containing box, a plurality of heating units distributed at intervals are arranged on the supporting frame, and the heating units are arranged on the supporting frame. The heating unit comprises a substrate, and a heating sheet and a temperature sensor which are positioned on the substrate; when the accommodating box is positioned in the battery capacity grading formation mechanism, the temperature probe is directly or indirectly propped against the heating sheet; the calibration device further comprises a controller connected with the temperature sensor and the temperature probe. According to the automatic calibration device, the temperature probes are automatically guided to be in contact with the heating unit through rapid butt joint of the containing box and the capacity grading formation mechanism, calibration can be completed without manual intervention, the downtime is remarkably shortened, the multiple temperature probes can be calibrated at the same time, and the automatic calibration device is particularly suitable for rapid calibration of a multi-channel temperature monitoring system in the capacity grading formation mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of calibration tooling, and in particular to an automatic calibration device for a temperature probe and a battery capacity division and formation mechanism. Background Art

[0002] In the production process of lithium-ion batteries, the capacity formation is a key process link, and its temperature control accuracy directly affects the battery performance and safety. The traditional battery capacity formation mechanism monitors the battery temperature in real time through the temperature probe arranged on the restraint tray. However, in long-term use, the temperature probe is prone to measurement deviation due to aging, poor contact or environmental interference, and regular calibration is required to ensure data reliability.

[0003] At present, the calibration of temperature probes mainly relies on two methods: one is to manually disassemble the probe and send it to the inspection laboratory for calibration. This method requires interrupting the production line operation, and the disassembly and reassembly process is prone to introduce mechanical errors, and the calibration cycle is long and inefficient; the second is that online calibration devices mostly use a single constant temperature source (such as a constant temperature bath) for overall calibration, but because the temperature probes in the volumetric formation mechanism are densely distributed and the installation positions are fixed, it is difficult for existing devices to achieve synchronous calibration of multiple probes, and the constant temperature bath is large in size and cannot be quickly connected to the production line equipment, resulting in complicated calibration operations. In addition, the temperature transfer path in the traditional calibration process (such as indirect temperature measurement through air or medium) is easily interfered by environmental factors, resulting in insufficient calibration accuracy. Summary of the invention

[0004] The purpose of the present invention is to provide a temperature probe automatic calibration device that can quickly dock with a volume separation formation mechanism and support multi-probe synchronous calibration

[0005] In order to achieve the above-mentioned object, the present invention provides a temperature probe automatic calibration device, which is used to calibrate the temperature probe in a battery capacity division formation mechanism, the calibration device includes a containing box, the containing box can be docked with the restraint tray placement position in the battery capacity division formation mechanism, a support frame is arranged in the containing box, a plurality of heating units distributed at intervals are arranged on the support frame, the heating unit includes a substrate, a heating sheet located on the substrate and a temperature sensor; the heating sheet can be heated to a target temperature according to the driving of a driving power supply; when the containing box is located in the battery capacity division formation mechanism, the temperature probe is directly or indirectly abutted against the heating sheet;

[0006] The calibration device further comprises a controller connected to the temperature sensor and the temperature probe, and the controller calibrates the temperature probe according to the difference between the corresponding detection values ​​of the temperature sensor and the temperature probe.

[0007] Preferably, the temperature sensor includes a first sensor and a second sensor, the controller controls the temperature of the heating plate according to the detection value of the first sensor, and the controller calibrates the temperature probe according to the detection value of the second sensor.

[0008] Preferably, a first groove is provided on the substrate, the first sensor and the second sensor are embedded on the bottom wall of the first groove, a first heat conductive block is also laid in the first groove, and the heating sheet is located on the upper surface of the first heat conductive block.

[0009] Preferably, a second heat-conducting block is laid on the top of the heating sheet, and the second heat-conducting block is used to abut against the corresponding temperature probe.

[0010] Preferably, a display electrically connected to the controller is also provided in the containing box, and the display is used to display the detection values ​​of the temperature sensor and the temperature probe.

[0011] Preferably, a plurality of first positioning portions are further provided on the peripheral side of the bottom wall of the accommodation box, and based on the first positioning portions, the accommodation box can be fixed at a corresponding position of the battery capacity dividing and forming mechanism.

[0012] Preferably, a second positioning portion is provided on one side of the bottom wall of the containing box, and the second positioning portion is used to identify the installation direction of the containing box.

[0013] Preferably, the driving power source is located in the containing box.

[0014] Preferably, a second groove is provided on the bottom wall of the outer side of the containing box, a conductive column is provided in the second groove, the upper end of the conductive column passes through the bottom wall of the containing box and is located in the containing box, and one end of the conductive column located in the containing box is connected to the driving power supply.

[0015] The present invention also provides a battery capacity division and formation mechanism, which includes a frame located at the bottom and a charge and discharge mechanism located at the top, the charge and discharge mechanism is also provided with a temperature probe for monitoring the battery temperature, and there is a loading space between the frame and the charge and discharge mechanism, and the loading space is used to accommodate a restraint tray or the temperature probe automatic calibration device as described above.

[0016] Compared with the prior art, the temperature probe automatic calibration device provided by the above technical solution of the present invention automatically guides the temperature probe to contact the heating unit through the rapid docking of the accommodating box and the volume separation and formation mechanism, and can complete the calibration without manual intervention, thereby significantly reducing the downtime. In addition, a plurality of heating units are arranged on the support frame, and a plurality of temperature probes can be calibrated at the same time, which is particularly suitable for the rapid calibration of the multi-channel temperature monitoring system in the volume separation and formation mechanism. Furthermore, the size of the accommodating box is completely consistent with the placement position of the restraint tray, and the original tray can be directly replaced without the need to modify the volume separation and formation mechanism, and the adaptability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the battery capacity division and formation mechanism in an embodiment of the present invention.

[0018] Figure 2 for Figure 1 Diagram of the connection between the automatic calibration device for the medium temperature probe and one of the charge and discharge mechanisms.

[0019] Figure 3 It is a three-dimensional structural diagram of the temperature probe automatic calibration device in an embodiment of the present invention.

[0020] Figure 4 for Figure 3 Installation structure diagram of the heating unit.

[0021] Figure 5 It is a three-dimensional structural diagram of the heating unit in an embodiment of the present invention.

[0022] Figure 6 for Figure 5 Exploded diagram of .

[0023] Figure 7 1 is a bottom structural diagram of the temperature probe automatic calibration device in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0025] like Figures 1 to 5 As shown, this embodiment discloses a temperature probe automatic calibration device 2, which is used to calibrate the temperature probe 12 (such as a thermocouple attached to the surface of the battery) in the battery capacity formation mechanism. The calibration device 2 includes a container 20, the size of which matches the placement position of the restraint tray in the battery capacity formation mechanism. A support frame 21 is provided inside the container 20, and a plurality of spaced heating units 22 are fixed on the support frame 21. The spacing between adjacent heating units 22 is 50 mm or other required dimensions, which is used to simulate the heating scene of multiple groups of batteries.

[0026] Each heating unit 22 includes a substrate 220 , a heating sheet 221 mounted on the surface of the substrate 220 , and a temperature sensor embedded in the substrate 220 .

[0027] The heating sheet 221 can be driven by the driving power source 23 to heat up to a preset target temperature (eg, 50° C.±0.1° C.).

[0028] When the container 20 is docked to the volume separation and formation mechanism (such as Figure 1 and Figure 2 ), the original temperature probe 12 of the mechanism is moved to the surface of the heating plate 221 through the motion mechanism and directly contacts with it (or indirectly contacts with it through a thermally conductive silicone pad).

[0029] The calibration device 2 also includes a controller U (such as a PLC module), which is connected to the temperature sensor, the temperature probe 12 and the driving power supply 23. The controller U compares the difference between the measured values ​​of the temperature sensor and the temperature probe 12, uses the least square method or other algorithm to fit and generate the calibration coefficient, and writes it into the storage chip of the temperature probe 12 to complete the calibration of the temperature probe 12.

[0030] In the present embodiment, by the quick docking of the accommodating box 20 with the volume separation and formation mechanism, and the automatic guidance of the temperature probe 12 by the motion mechanism to contact the heating unit 22, the calibration can be completed without manual intervention, which significantly reduces the downtime. In addition, a plurality of heating units 22 are arranged on the support frame 21, and a plurality of temperature probes 12 can be calibrated at the same time, which is particularly suitable for the rapid calibration of the multi-channel temperature monitoring system in the volume separation and formation mechanism. Furthermore, the size of the accommodating box 20 is exactly the same as the placement position of the restraint tray, and the original tray can be directly replaced without the need to transform the volume separation and formation mechanism, and the adaptability is strong.

[0031] On the other hand, Figure 6 The temperature sensor includes a first sensor 222a and a second sensor 222b. The controller U controls the temperature of the heating plate 221 according to the detection value of the first sensor 222a. That is, the controller U controls the output power of the driving power supply 23 according to the detection value of the first sensor 222a to adjust the temperature of the heating plate 221.

[0032] The controller U calibrates the temperature probe 12 according to the detection value of the second sensor 222b.

[0033] Specifically, the first sensor 222a controls the power output of the driving power supply 23 through PID algorithm feedback to maintain the temperature of the heating plate 221. The second sensor 222b is used as a calibration reference, and the calibration procedure is triggered when the difference between its detection value and the measurement value of the temperature probe 12 exceeds a preset value. The dual sensor design can avoid system errors caused by failure of a single sensor.

[0034] It should be noted that if a single sensor is used to perform both temperature control and calibration functions, dynamic adjustments during the temperature control process (such as frequent power corrections of the PID algorithm) will cause sensor data fluctuations, thereby making the calibration reference value unstable.

[0035] In this embodiment, the first sensor 222a focuses on real-time temperature control, and quickly responds to temperature fluctuations through high-frequency sampling (e.g., 10 Hz), ensuring that the temperature of the heating plate 221 is stable at the target value (e.g., ±0.1°C fluctuation);

[0036] The second sensor 222b serves as a static reference and outputs smooth data with low-frequency sampling (eg, 1 Hz) to prevent transient interference in the temperature control process from affecting the calibration accuracy.

[0037] In specific implementation, the signal line of the first sensor 222a may be shielded to give priority to processing high-frequency temperature control signals; the signal line of the second sensor 222b may be physically isolated from the temperature control circuit to prevent common-mode noise from entering the calibration loop.

[0038] Based on this, the stability of the calibration reference value can be improved to ±0.1°C, the temperature control and calibration tasks can be decoupled, and the overall system error can be reduced by more than 50%.

[0039] Furthermore, if Figure 6 The substrate 220 is provided with a first groove 223, and the first sensor 222a and the second sensor 222b are embedded in the bottom wall of the first groove 223. The first groove 223 is filled with a first heat-conducting block 224 (thermal conductivity ≥ 380 W / m·K) made of copper or other materials, and the heating sheet 221 is bonded to the upper surface of the first heat-conducting block 224 by a heat-conducting adhesive. Since the temperature uniformity on the surface of the first heat-conducting block 224 is relatively good, it can avoid that the temperature detected by the temperature sensor deviates greatly from the actual temperature.

[0040] On the other hand, the second heat-conducting block 225 with a thickness of 1.5 mm is covered on the surface of the heating sheet 221, and it forms a surface contact with the plane of the temperature probe 12. The Mohs hardness of the second heat-conducting block 225 is lower than that of the probe material to prevent damage to the probe during the calibration process. Through the provision of the second heat-conducting block 225, the accuracy of the temperature detected by the temperature probe 12 can be effectively improved, and the temperature value detected by the temperature probe 12 due to the abnormal local temperature of the heating sheet 221 is prevented from having a large deviation. In addition, a pressing block 226 connected to the substrate 220 is also provided on both sides of the second heat-conducting block 225, so as to press the second heat-conducting block 225, the heating sheet 221, and the first heat-conducting block 224 together.

[0041] On the other hand, Figure 3 A display 24 electrically connected to the controller U is also provided in the containing box 20. The display 24 is used to display the detection values ​​of the temperature sensor and the temperature probe 12 for the convenience of observation by the operator.

[0042] On the other hand, Figure 7 A plurality of first positioning portions 25 are also provided on the peripheral side of the bottom wall of the accommodation box 20. Based on the first positioning portions 25, the accommodation box 20 can be fixed at the corresponding position of the battery capacity dividing and forming mechanism.

[0043] A second positioning portion 26 is provided on one side of the bottom wall of the accommodating box 20 . The second positioning portion 26 is used to identify the installation direction of the accommodating box 20 to prevent reverse installation.

[0044] Specifically, the first positioning portion 25 and the second positioning portion 26 in this embodiment are both positioning holes. Four first positioning portions 25 are provided on the periphery of the bottom of the containing box 20, and are interference-fitted with the positioning pins on the volume separation and formation mechanism.

[0045] The design of the plurality of first positioning portions 25 and the one second positioning portion 26 ensures that the containing box 20 can be correctly and stably installed in the battery capacity dividing and forming mechanism.

[0046] like Figure 3 The driving power source 23 is located in the containing box 20, and there is no need to improve the circuit of the battery capacity division and formation mechanism, and wiring cables are also omitted.

[0047] On the other hand, a second groove 27 with a certain depth (e.g., 10 mm) is provided at the bottom of the receiving box 20, and a conductive column 28 is embedded in the second groove 27. The upper end of the conductive column 28 passes through the box body to connect the driving power supply 23, and the lower end is exposed 10 mm in height. When the device is placed in place, it contacts the power supply spring of the capacity separation formation mechanism to achieve plug-free power supply.

[0048] In another preferred embodiment of the present invention, Figure 1 A battery capacity division and formation mechanism is also disclosed, which includes a frame 10 located at the bottom and a charge and discharge mechanism 11 located at the top. The charge and discharge mechanism is also provided with a temperature probe 12 for monitoring the battery temperature. There is a loading space between the frame 10 and the charge and discharge mechanism, and the loading space is used to accommodate a restraint tray or the temperature probe automatic calibration device 2 in the above embodiment.

[0049] For the battery capacity division and formation mechanism, when working normally, the restraint tray is placed on the frame 10, and then the battery is charged or discharged through the charge and discharge mechanism 11. When the temperature probe 12 needs to be calibrated, the restraint tray is moved out of the loading space, and the receiving box 20 in the temperature probe 12 automatic calibration device 2 is placed on the frame 10, so that each temperature probe 12 can be automatically calibrated at the same time.

[0050] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A temperature probe automatic calibration device, used for calibrating the temperature probe in a battery capacity formation mechanism, characterized in that: The calibration device comprises a containing box, the containing box can be docked with the restraint tray placement position in the battery capacity division formation mechanism, a support frame is arranged in the containing box, a plurality of heating units distributed at intervals are arranged on the support frame, the heating unit comprises a substrate, a heating sheet located on the substrate and a temperature sensor; the heating sheet can be heated to a target temperature according to the driving of a driving power source; when the containing box is located in the battery capacity division formation mechanism, the temperature probe is directly or indirectly in contact with the heating sheet; The calibration device further comprises a controller connected to the temperature sensor and the temperature probe, and the controller calibrates the temperature probe according to the difference between the corresponding detection values ​​of the temperature sensor and the temperature probe.

2. The temperature probe automatic calibration device according to claim 1, characterized in that: The temperature sensor includes a first sensor and a second sensor. The controller controls the temperature of the heating plate according to the detection value of the first sensor. The controller calibrates the temperature probe according to the detection value of the second sensor.

3. The temperature probe automatic calibration device according to claim 2, characterized in that: A first groove is provided on the substrate, the first sensor and the second sensor are embedded on the bottom wall of the first groove, a first heat conducting block is also laid in the first groove, and the heating sheet is located on the upper surface of the first heat conducting block.

4. The temperature probe automatic calibration device according to claim 3, characterized in that: A second heat-conducting block is also laid on the top of the heating sheet, and the second heat-conducting block is used to abut against the corresponding temperature probe.

5. The temperature probe automatic calibration device according to claim 1, characterized in that: A display electrically connected to the controller is also provided in the containing box, and the display is used to display the detection values ​​of the temperature sensor and the temperature probe.

6. The temperature probe automatic calibration device according to claim 1, characterized in that: A plurality of first positioning parts are also provided on the peripheral side of the bottom wall of the accommodation box, and based on the first positioning parts, the accommodation box can be fixed at the corresponding position of the battery capacity dividing and forming mechanism.

7. The temperature probe automatic calibration device according to claim 1, characterized in that: A second positioning portion is provided on one side of the bottom wall of the accommodation box, and the second positioning portion is used to identify the installation direction of the accommodation box.

8. The temperature probe automatic calibration device according to claim 1, characterized in that: The driving power source is located in the containing box.

9. The temperature probe automatic calibration device according to claim 8, characterized in that: A second groove is also provided on the bottom wall of the outer side of the containing box, a conductive column is provided in the second groove, the upper end of the conductive column passes through the bottom wall of the containing box and is located in the containing box, and one end of the conductive column located in the containing box is connected to the driving power supply.

10. A battery capacity division and formation mechanism, characterized in that: It comprises a frame located at the bottom and a charge-discharge mechanism located at the top, the charge-discharge mechanism is also provided with a temperature probe for monitoring the battery temperature, and there is a loading space between the frame and the charge-discharge mechanism, the loading space is used to accommodate a restraint tray or the temperature probe automatic calibration device as described in any one of claims 1 to 9.

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