Battery cell constant power thermal runaway testing device

Abstract

The utility model provides a constant-power thermal runaway testing device for a battery cell. The constant-power thermal runaway testing device comprises a power regulator, an electric energy meter and a heating sheet which are electrically connected in sequence. The power regulator, the electric energy meter and the heating sheet are respectively connected to a power supply; the electric energy meter is used for detecting the real-time active power value of the heating sheet. The power regulator comprises a silicon controlled rectifier, so that accurate power regulation is realized. The electric energy meter is used for monitoring power in real time. The device further comprises a switch used for controlling power supply of the heating piece. According to the utility model, through cooperation of the power regulator and the electric energy meter, accurate control and real-time monitoring of the power of the heating sheet are realized, reliability and accuracy of a constant-power thermal runaway test are substantially raised, and more reliable data support is provided for evaluation of safety performance of a cell. The problems that in the prior art, a testing method is low in power control precision, large in manual operation error and the like are solved.

Description

Technical Field

[0001] The utility model relates to the field of new energy battery testing, in particular to a battery cell constant power thermal runaway testing device. Background Art

[0002] The new energy industry is developing rapidly, particularly the new energy battery industry, which continues to experience rapid growth. Manufacturing processes are constantly innovating, with new formulas and technologies constantly being developed. High energy, long life, and improved safety performance are key goals for battery cell developers. Currently, constant-temperature thermal runaway testing for battery cells relies on manual monitoring of the temperature rise rate on a computer and the corresponding power control output to achieve the desired effect. However, this requires manual adjustment of test steps and other related information, which can lead to significant fluctuations in temperature rise data, thus affecting the effectiveness of thermal runaway testing. Existing constant-power testing solutions primarily include the following: The first utilizes a constant-voltage power supply and manually adjusts the output power. However, since the resistance of the heater increases with temperature, P = U² / R, and when U remains constant, the power decreases. Manual control increases labor costs. Furthermore, manual control requires visually observing the current power and manually controlling the output power, which can lead to long acquisition and control times. This can result in output power fluctuations that are not within controllable limits, and the accuracy of constant-power thermal runaway testing cannot be guaranteed. The second approach utilizes a high-precision programmable DC power supply that automatically outputs the set power. However, these high-precision programmable DC power supplies are relatively expensive, increasing testing costs. Moreover, during the implementation of the above two solutions, people must stay away from the test site and visually observe the changes in relevant parameters on the computer. Therefore, after the thermal runaway judgment conditions are reached, people go to the test site to disconnect the power supply of the heating plate, and it takes a long time to stop heating.

[0003] To this end, it is urgent to invent a battery cell constant power thermal runaway test device to effectively solve the above technical problems. Utility Model Content

[0004] The purpose of the utility model is to provide a battery cell constant power thermal runaway test device to effectively solve the technical problem of inaccurate manual control of power-off time.

[0005] To achieve the above-mentioned purpose, the utility model provides a constant-power thermal runaway test device for a battery cell, comprising a power regulator, an electric energy meter and a heating plate electrically connected in sequence; the power regulator, the electric energy meter and the heating plate are respectively connected to a power supply; the electric energy meter is used to detect the real-time active power value of the heating plate.

[0006] Furthermore, the power regulator includes a thyristor.

[0007] Furthermore, a switch is connected between the negative electrode of the power supply and the heating plate.

[0008] Furthermore, the accuracy of the power regulator is 0.1%.

[0009] In addition, the electric energy meter includes a voltage sensor and a current sensor. The voltage sensor is used to measure voltage, and the current sensor is used to measure current.

[0010] Specifically, the L1 port of the power regulator is connected to the positive pole of the power supply, the L2 port is connected to the 10 port of the current sensor, the 11 port is connected to the heating plate and the V1 port of the voltage sensor, and the other ports of the voltage sensor are connected to the negative pole of the power supply.

[0011] Furthermore, it also includes a first converter connected to the RS485 of the power regulator.

[0012] Furthermore, it also includes a second converter connected to the RS485 of the electric energy meter.

[0013] In addition, the heating plate is made of ceramic.

[0014] The battery cell constant-power thermal runaway test device provided by this utility model implements constant-power thermal runaway testing of battery cells by connecting a power supply, a power regulator, and a heater. In particular, the connected energy meter, which is unaffected by temperature fluctuations, accurately measures the real-time active power value of the heater, ensuring power stability and accuracy during the test, thereby improving the reliability and accuracy of the test.

[0015] Furthermore, the power regulator of this utility model utilizes thyristors, coupled with a sensor interface and feedback mechanism, to achieve precise power control. The energy meter design incorporates high-precision sampling and calculation functions, further enhancing measurement accuracy. A ceramic heater and optional switch design enhance the device's practicality and safety. These features combine to give this utility model's test device significant advantages in the field of battery cell thermal runaway testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of component wiring in one embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following is a more detailed description of a battery cell constant power thermal runaway test device of the present invention, with reference to the accompanying drawings. Preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art may modify the present invention described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being generally known to those skilled in the art and not intended to limit the present invention.

[0018] The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0019] like Figure 1 As shown, the present invention provides a battery cell constant power thermal runaway test device, comprising: a power regulator, an electric energy meter and a heating plate electrically connected in sequence; the power regulator, the electric energy meter and the heating plate are respectively connected to a power supply; the electric energy meter is used to detect the real-time active power value of the heating plate.

[0020] The power regulator can be a mature product available on the market. In one embodiment, the power regulator includes a thyristor. The power regulator also includes a sensor interface and a feedback mechanism. The sensor interface connects to voltage and current sensors to obtain real-time data. The feedback mechanism feeds the sensor data back to the control circuit to achieve precise power control. Preferably, the power regulator has an accuracy of 0.1%.

[0021] In this example, a switch is further connected between the negative electrode of the power supply and the heating plate.

[0022] The electric energy meter can be a mature product available on the market. In one embodiment, the electric energy meter includes a voltage sensor and a current sensor. The voltage sensor measures voltage, and the current sensor measures current. The electric energy meter also includes a sampling module, a microcontroller, and an electric energy metering chip. The sampling module converts the analog signals from the current and voltage sensors into digital signals. The microcontroller processes the sampled data and executes the measurement algorithm. The electric energy metering chip calculates active power, reactive power, apparent power, and other power parameters.

[0023] Preferably, the electric energy meter has a sampling rate of 64 points per cycle, i.e., 64 sampling points every 20 milliseconds; the measurement accuracy is 0.5%. The electric energy meter directly measures current of 5 mA to 5 A, and directly measures voltage of 277 VLN and 480 VLL, where VLN is the phase voltage and VLL is the line voltage.

[0024] In this example, the L1 port of the power regulator is connected to the positive pole of the power supply, the L2 port is connected to the 10 port of the current sensor, the 11 port is connected to the heating plate and the V1 port of the voltage sensor, and the other ports of the voltage sensor are connected to the negative pole of the power supply.

[0025] Furthermore, it also includes a first converter connected to the RS485 of the power regulator.

[0026] Furthermore, it also includes a second converter connected to the RS485 of the electric energy meter.

[0027] The material of the heating plate is ceramic.

[0028] The working process of the battery cell constant power thermal runaway test device of the utility model is as follows:

[0029] First, the power regulator is used to set the desired constant power output. The controller's control circuit generates a corresponding control signal based on the set value, achieving precise power regulation through the thyristor.

[0030] Secondly, the energy meter continuously monitors the real-time active power of the heater. A voltage sensor and a current sensor measure the voltage across the heater and the current flowing through it, respectively. A sampling module converts these analog signals into digital signals, and a microcontroller processes the data and executes the measurement algorithm. The energy metering chip calculates the real-time active power value based on this processed data.

[0031] The power regulator's sensor interface then receives the meter's measurement data, and a feedback mechanism transmits this data to the control circuit. The control circuit compares the actual power value with the set value. If there is a deviation, the control signal is adjusted to correct the output power, thereby maintaining a constant power output for the heater.

[0032] Finally, when thermal runaway is detected in the battery cell, the operator can quickly cut off the power supply to the heater through the switch to ensure test safety.

[0033] This battery cell constant-power thermal runaway test device achieves precise control and real-time monitoring of heater power through the collaboration of a power regulator and an energy meter, reducing manual intervention. The high accuracy of the power regulator (0.1%) ensures output power stability, while the energy meter's high sampling rate (64 samples every 20ms) and excellent measurement accuracy (0.5%) ensure accurate power monitoring. This design significantly improves the reliability and accuracy of constant-power thermal runaway testing, providing more reliable data support for evaluating battery cell safety performance.

[0034] Furthermore, the device utilizes a ceramic heating element, which offers excellent thermal stability and high-temperature resistance, helping to maintain a stable test environment. The device's integrated switch provides a quick-response mechanism for operators, enabling them to promptly cut off power supply when an abnormality is detected, enhancing the safety of the test process.

[0035] In summary, the battery cell constant power thermal runaway test device of the present invention has significantly improved test accuracy, operational convenience and safety, providing more reliable and efficient technical support for the study of battery cell thermal runaway characteristics.

[0036] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A battery cell constant power thermal runaway test device, characterized in that: include: A power regulator, an electric energy meter and a heating plate are electrically connected in sequence; the power regulator, the electric energy meter and the heating plate are connected to a power supply respectively; The electric energy meter is used to detect the real-time active power value of the heating plate.

2. The battery cell constant power thermal runaway test device according to claim 1, characterized in that: The power regulator includes a thyristor.

3. The battery cell constant power thermal runaway test device according to claim 1, characterized in that: A switch is also connected between the negative pole of the power supply and the heating plate.

4. The battery cell constant power thermal runaway test device according to claim 1, characterized in that: The accuracy of the power regulator is 0.1%.

5. The battery cell constant power thermal runaway test device according to claim 1, characterized in that: The electric energy meter includes a voltage sensor and a current sensor. The voltage sensor is used to measure voltage; the current sensor is used to measure current.

6. The battery cell constant power thermal runaway test device according to claim 5, characterized in that: The L1 port of the power regulator is connected to the positive pole of the power supply, the L2 port is connected to the 10 port of the current sensor, the 11 port is connected to the heating plate and the V1 port of the voltage sensor, and the other ports of the voltage sensor are connected to the negative pole of the power supply.

7. The battery cell constant power thermal runaway test device according to claim 6, characterized in that: It also includes a first converter connected to the RS485 of the power regulator.

8. The battery cell constant power thermal runaway test device according to claim 6, characterized in that: It also includes a second converter connected to the RS485 of the electric energy meter.

9. The battery cell constant power thermal runaway test device according to claim 1, characterized in that: The material of the heating plate is ceramic.

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