An in-situ testing system for battery thermodynamic characteristics

Abstract

This utility model discloses an in-situ testing system for battery thermal characteristics, comprising: a battery clamping module including two clamping plates, one fixed and the other adjustable; a thickness measurement sensor assembly for measuring the thickness change of the battery during charging and discharging; an expansion force measurement assembly for measuring the expansion force generated by the battery during charging and discharging; and a temperature measurement module for monitoring the heat generation changes of the battery during charging and discharging. This utility model can simultaneously monitor the thickness change, expansion force change, and temperature change of the battery during charging and discharging, improving the comprehensiveness and accuracy of the test. It is applicable to testing batteries of different sizes and types, and has wide applicability. It solves the problems of limited functionality and cumbersome testing processes in existing battery testing devices, providing comprehensive and accurate data support for battery performance evaluation, and has broad market application prospects.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, specifically to an in-situ testing system for battery thermal characteristics. Background Technology

[0002] With the rapid development of battery technology, lithium-ion batteries, sodium-ion batteries, and other types of batteries are increasingly widely used in electric vehicles, energy storage systems, portable electronic devices, and other fields. As the core energy component of these devices, the performance, safety, and lifespan of batteries directly affect the overall performance of the devices and the user experience.

[0003] During the charging and discharging process of a battery, a series of complex physical and chemical changes occur. Taking lithium-ion batteries as an example, these changes include the lithium insertion / deintercalation process of the positive and negative electrode active materials, the decomposition and recombination of the electrolyte, and the generation and release of internal stress within the battery. These changes have a significant impact on the battery's thickness, expansion force, and heat generation.

[0004] Currently, most battery testing devices on the market can only test one aspect of battery performance. For example, some devices use mechanical measuring tools such as micrometers or vernier calipers to measure changes in battery thickness, but this method has limited accuracy and cannot monitor in real time. Some devices monitor battery heat generation by attaching temperature sensors, but cannot simultaneously measure changes in battery expansion force. In addition, some devices use pressure sensors to measure battery expansion force, but often neglect the simultaneous monitoring of thickness and heat generation.

[0005] This single-function testing system cannot meet the needs of comprehensive battery performance evaluation. This is because battery thickness expansion, changes in expansion force, and heat generation are interrelated. For example, battery thickness expansion may cause deformation of the battery casing, affecting the battery's sealing and safety; increased expansion force may lead to internal stress concentration, causing battery failure or explosion; excessive heat generation may cause the battery temperature to become too high, accelerating battery aging and degradation. Therefore, the test results of a single indicator are insufficient to accurately reflect the overall performance of the battery.

[0006] To comprehensively evaluate battery performance, there is an urgent need for a comprehensive testing system capable of simultaneously monitoring changes in battery thickness, expansion force, and heat generation during charging and discharging. Such a system would not only improve the comprehensiveness and accuracy of testing but also provide strong data support for battery research and development, production, and quality control. Furthermore, with the continuous advancement of battery technology and the expansion of its application areas, the requirements for battery performance are becoming increasingly stringent, leading to a growing market demand for such comprehensive testing systems. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an in-situ testing system for battery thermodynamic characteristics, so as to simultaneously monitor the changes in thickness, expansion force and heat generation of the battery during charging and discharging, and provide comprehensive and accurate data support for battery performance evaluation.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows:

[0009] An in-situ testing system for battery thermal properties, comprising:

[0010] The battery clamping module includes two clamping plates: one is a fixed clamping plate, and the other is an adjustable movable clamping plate.

[0011] Thickness measurement sensor assembly for measuring the thickness change of a battery during charging and discharging;

[0012] Expansion force measurement component, used to measure the expansion force generated by the battery during charging and discharging;

[0013] The temperature measurement module is used to monitor the changes in heat generation during the charging and discharging process of the battery.

[0014] Optionally, the two clamping plates are disposed on a support panel for placing the battery to accommodate battery cells of different sizes and types.

[0015] Optionally, the thickness measurement sensor assembly includes a laser rangefinder and a thickness calibration side plate; one side of the battery is in close contact with the fixing clamping plate, and the thickness calibration side plate is provided at the top of the opposite side; the laser rangefinder is mounted on the fixing clamping plate, and the laser emission port of the laser rangefinder is aligned with the side of the fixing clamping plate closest to the battery.

[0016] Optionally, the expansion force measurement component includes a pressure sensor, which is mounted at a position in contact with the battery and the force-bearing surface of the pressure sensor is in contact with the battery surface.

[0017] Optionally, the expansion force measuring assembly further includes an elastic support member that contacts the pressure sensor to provide elastic support for the pressure sensor.

[0018] Optionally, the temperature measurement module uses a thermocouple or a thermistor as a temperature measurement sensor; the temperature measurement sensor is arranged on the surface or inside the battery.

[0019] Optionally, the battery thermal characteristic in-situ testing system further includes a housing, in which the battery clamping module, thickness measurement sensor assembly, expansion force measurement assembly, and temperature measurement module are all housed.

[0020] Optionally, the battery thermal characteristic in-situ testing system further includes an ambient temperature control module, which is disposed on the housing and includes heating and cooling components, a temperature sensor component, and a wind circulation device; the temperature sensor is used to detect the temperature inside the housing and to control the operation of the heating and cooling components and the wind circulation device based on the detection result of the temperature sensor.

[0021] Optionally, the battery thermodynamic characteristic in-situ testing system further includes a charge-discharge control module for controlling the battery's charge-discharge process.

[0022] Optionally, the battery thermal characteristic in-situ testing system further includes a data acquisition module and a safety protection module; the data acquisition module is used to acquire data from the thickness measurement sensor component, the expansion force measurement component, the temperature measurement module, and the charge / discharge control module; a pressure relief solenoid valve is provided on the housing; when the data acquired by the data acquisition module is abnormal, the safety protection module controls the pressure relief solenoid valve to open.

[0023] Compared with the prior art, the advantages of this utility model are as follows:

[0024] The in-situ battery thermodynamic characteristic testing system provided in this embodiment can simultaneously monitor the thickness changes, expansion force changes, and temperature changes of the battery during charging and discharging, improving the comprehensiveness and accuracy of the test. It is applicable to testing batteries of different sizes and types, exhibiting wide applicability. It solves the problems of limited functionality and cumbersome testing processes in existing battery testing devices, providing comprehensive and accurate data support for battery performance evaluation, and has broad market application prospects. Attached Figure Description

[0025] Figure 1 A schematic diagram of the composition of the in-situ battery thermodynamic characteristic testing system provided in an embodiment of this application;

[0026] The components include: 1. Outer shell; 2. Pressure relief solenoid valve; 3. Battery; 4. Support panel; 5. Fixed clamping plate; 6. Adjustable movable clamping plate; 7. Laser rangefinder; 8. Thickness calibration side plate; 9. Pressure sensor; 10. Elastic support structure; 11. Temperature measurement sensor; 12. Lead wire; 13. Ambient temperature control module; 131. Heating and cooling components; 132. Temperature sensor assembly; 133. Air circulation device; 14. Charge and discharge control module; 15. Data acquisition module; and 16. Safety protection module. Detailed Implementation

[0027] Example:

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a mechanical connection or an electrical connection; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] See Figure 1 As shown, the in-situ battery thermal characteristic testing system provided in this embodiment mainly includes a battery clamping module, a thickness measurement sensor assembly, an expansion force measurement assembly, and a temperature measurement module.

[0035] The battery clamping module includes two clamping plates: a fixed clamping plate 5 and an adjustable movable clamping plate 6. This allows it to be used with battery cells of different sizes and types, such as cylindrical, prismatic, and pouch batteries. Battery 3 is a single cell of lithium-ion, sodium-ion, or lead-acid batteries, representing the smallest basic unit in a battery pack. It is typically manufactured using a specific process, consisting of a positive electrode, negative electrode, separator, and electrolyte, and encapsulated in a sealed casing. It is a sealed, independent unit used for storing and releasing electrical energy.

[0036] This thickness measurement sensor assembly is used to measure the thickness change of battery 3 during charging and discharging;

[0037] This expansion force measurement component is used to measure the expansion force generated by battery 3 during charging and discharging.

[0038] This temperature measurement module is used to monitor the heat generation changes of battery 3 during the charging and discharging process.

[0039] Therefore, the in-situ battery thermodynamic characteristic testing system provided in this embodiment can simultaneously monitor the thickness changes, expansion force changes, and temperature changes of the battery during charging and discharging, improving the comprehensiveness and accuracy of the test. It is applicable to testing batteries of different sizes and types, exhibiting wide applicability. It solves the problems of limited functionality and cumbersome testing processes in existing battery testing devices, providing comprehensive and accurate data support for battery performance evaluation, and has broad market application prospects.

[0040] In one specific embodiment, two clamping plates are disposed on a support panel 4 for placing the battery. The adjustable movable clamping plate 6 can achieve precise adjustment of the clamping force through a screw mechanism or a pneumatic device. The main body material of the clamping plate is made of high-strength, corrosion-resistant material, such as stainless steel or aluminum alloy, to ensure the stability and durability of the clamping mechanism. The surface material of the clamping plate is made of a low thermal conductivity material, such as medium-density fiberboard, to reduce heat transfer and ensure the accuracy of battery temperature distribution.

[0041] In one specific embodiment, the thickness measurement sensor assembly includes a laser rangefinder 7 and a thickness calibration side plate 8. The laser rangefinder 7 is used as the thickness measurement sensor, leveraging its high precision and non-contact measurement characteristics to avoid damage to the battery surface. One side of the battery 3 is in close contact with the fixing clamping plate 5, and the thickness calibration side plate 8 is positioned at the top of the opposite side. That is, the left side of the thickness calibration side plate 8 is flush with the right side of the battery, used to calibrate the battery thickness. The laser rangefinder 7 is mounted on the fixing clamping plate 5, and the laser emission port of the laser rangefinder 7 is aligned with the side of the fixing clamping plate 5 closest to the battery 3, thereby ensuring accurate measurement of the battery thickness change during charging and discharging. The measurement accuracy of the laser rangefinder 7 is no less than ±1μm. During measurement, the laser rangefinder 7 is activated, emitting a laser beam to the thickness calibration side plate 8 and receiving the reflected laser. Based on the time difference between the laser beam emission and reception, and the speed of laser propagation in air, the battery thickness can be calculated. By setting the interval between laser emission (1 time / minute), the battery thickness values ​​recorded at different times are calculated to obtain and record the real-time changes in battery thickness.

[0042] In one specific embodiment, the expansion force measuring component is located inside the adjustable movable clamping plate 6 and includes a pressure sensor 9 and an elastic support structure 10. The pressure sensor 9 is installed at the position in contact with the battery, and the force-bearing surface of the pressure sensor 9 is in close contact with the battery surface to ensure accurate measurement of the expansion force generated by the battery during charging and discharging and to obtain accurate pressure data. The elastic support 10 is disposed between the adjustable movable clamping plate 6 and the pressure sensor 9 and is in contact with the pressure sensor 9 to provide necessary elastic support, ensuring that the battery is not excessively constrained or damaged during expansion. The elastic support is made of a highly elastic material, such as spring steel or rubber, to withstand the pressure generated during battery expansion. When the battery expands, the elastic support 10 is subjected to pressure and deforms, and the pressure sensor 9 converts this deformation into an electrical signal for output. In actual installation, the installation position of the expansion force measuring component can be precisely designed and adjusted according to the shape of different batteries to ensure the accuracy and reliability of the measurement results. For example, the position, angle, or shape of the clamping plate, as well as the parameters of the pressure sensor and the elastic support structure, can be adjusted to accommodate batteries of different sizes and types and optimize the measurement effect.

[0043] In one specific embodiment, the temperature measurement module uses a thermocouple or thermistor as the temperature sensor 11, leveraging its high accuracy and fast response characteristics to monitor the heat generation changes of the battery during charging and discharging in real time. The temperature sensor 11 is arranged on the surface or inside the battery and fixed by drilling or adhesive. In this embodiment, a thermocouple is used as the temperature sensor, utilizing its high accuracy and fast response characteristics to monitor the heat generation changes of the battery during charging and discharging in real time. Figure 1 The temperature sensor 11 is attached to the surface of the battery, as shown.

[0044] In a preferred embodiment, the in-situ battery thermal characteristic testing system further includes a housing 1, within which the battery clamping module, thickness measurement sensor assembly, expansion force measurement assembly, and temperature measurement module are all housed. In other words, the entire test is essentially conducted within the housing to ensure safety.

[0045] In a preferred embodiment, the in-situ battery thermal characteristic testing system further includes an ambient temperature control module 13, which is mounted on the housing 1 and includes a heating and cooling assembly 131, a temperature sensor assembly 132, and a ventilation device 133. The temperature sensor 132 detects the temperature inside the housing, and the system controls the operation of the heating and cooling assembly 132 and the ventilation device 133 based on the detection results. The heating and cooling system employs PID temperature control, enabling precise setting and provision of an ambient temperature range from -40°C to 70°C, with a temperature accuracy controllable within ±0.5°C. The ventilation device ensures uniform ambient temperature distribution, reducing the impact of temperature gradients on the test results.

[0046] In a preferred embodiment, the in-situ battery thermodynamic characteristic testing system further includes a battery charge-discharge control module 14, used to control the battery's charge-discharge process, including setting and adjusting parameters such as charge-discharge current, voltage, capacity, energy, and time. In other words, the charge-discharge control module provides different test conditions for the battery and records the real-time changes in parameters such as current, voltage, and capacity. An electrochemical workstation, charge-discharge test cabinet, or other equipment capable of this function can be used as needed, and the positive and negative terminals of the battery 3 are connected to the charge-discharge control module 14 via leads 12.

[0047] In a preferred embodiment, the in-situ battery thermal characteristic testing system further includes a data acquisition module 15 and a safety protection module 16. The data acquisition module 15 collects data from the thickness measurement sensor assembly, the expansion force measurement assembly, the temperature measurement module, and the charge / discharge control module. This includes thickness data measured by the thickness measurement sensor assembly, expansion force data measured by the expansion force measurement assembly, temperature data measured by the temperature measurement module, and battery current, voltage, capacity, energy, and time data measured by the charge / discharge control module. The data acquisition module has data visualization capabilities, enabling it to visually display the thickness, expansion force, and temperature change curves of the battery during charge / discharge. A pressure relief solenoid valve 2 is installed on the housing 1. The pressure relief solenoid valve 2 provides multiple safety functions, including over-temperature protection, over-current protection, short-circuit protection, and over-voltage protection, ensuring safety during the testing process. When the data collected by the data acquisition module 15 is abnormal, such as when the battery temperature is abnormally high or the charge / discharge process is abnormal, the safety protection module 16 automatically stops the test process of the charge / discharge control module and issues an alarm, controlling the pressure relief solenoid valve 2 to open, thus providing explosion-proof pressure relief.

[0048] During testing, the battery to be tested is placed in the clamping module. One side of the two sides of the thickness to be measured is in close contact with the clamping module and the clamping plate 5 is fixed. The thickness calibration side plate 8 is attached to the other side. The battery position is fixed by adjusting the adjustable movable clamping plate 6. The temperature measurement sensor 11 is attached to the surface of the battery to be measured. The positive and negative terminals of the battery 3 are connected to the charge and discharge control module through the lead wire 12. The test can then be performed.

[0049] The above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made based on the substance of the content of this utility model should be covered within the scope of protection of this utility model.

Claims

1. An in-situ testing system for battery thermodynamic characteristics, characterized in that, include: The battery clamping module includes two clamping plates: one is a fixed clamping plate, and the other is an adjustable movable clamping plate. Thickness measurement sensor assembly for measuring the thickness change of a battery during charging and discharging; Expansion force measurement component, used to measure the expansion force generated by the battery during charging and discharging; The temperature measurement module is used to monitor the changes in heat generation during the charging and discharging process of the battery.

2. The in-situ battery thermodynamic characteristic testing system as described in claim 1, characterized in that, The two clamping plates are mounted on a support panel for placing batteries to accommodate battery cells of different sizes and types.

3. The in-situ battery thermodynamic characteristic testing system as described in claim 1 or 2, characterized in that, The thickness measurement sensor assembly includes a laser rangefinder and a thickness calibration side plate; one side of the battery is in close contact with the fixing clamp plate, and the thickness calibration side plate is provided at the top of the opposite side; the laser rangefinder is mounted on the fixing clamp plate, and the laser emission port of the laser rangefinder is aligned with the side of the fixing clamp plate closest to the battery.

4. The in-situ battery thermodynamic characteristic testing system as described in claim 1, characterized in that, The expansion force measurement assembly includes a pressure sensor, which is installed at a position in contact with the battery and the force-bearing surface of the pressure sensor is in contact with the battery surface.

5. The in-situ battery thermodynamic characteristic testing system as described in claim 4, characterized in that, The expansion force measuring assembly also includes an elastic support member that contacts the pressure sensor to provide elastic support for the pressure sensor.

6. The in-situ battery thermodynamic characteristic testing system as described in claim 1, characterized in that, The temperature measurement module uses a thermocouple or a thermistor as a temperature measurement sensor; the temperature measurement sensor is arranged on the surface or inside the battery.

7. The in-situ battery thermodynamic characteristic testing system as described in claim 1, characterized in that, It also includes a housing, in which the battery clamping module, thickness measurement sensor assembly, expansion force measurement assembly, and temperature measurement module are all housed.

8. The in-situ battery thermodynamic characteristic testing system as described in claim 7, characterized in that, It also includes an ambient temperature control module, which is mounted on the housing and includes heating and cooling components, a temperature sensor assembly, and a fan circulation device. The temperature sensor is used to detect the temperature inside the housing and to control the operation of the heating and cooling components and the fan circulation device based on the detection results of the temperature sensor.

9. The in-situ battery thermodynamic characteristic testing system as described in claim 8, characterized in that, It also includes a charge / discharge control module to control the battery's charging and discharging process.

10. The in-situ battery thermodynamic characteristic testing system as described in claim 9, characterized in that, It also includes a data acquisition module and a safety protection module; the data acquisition module is used to collect data from the thickness measurement sensor assembly, the expansion force measurement assembly, the temperature measurement module, and the charge and discharge control module; a pressure relief solenoid valve is provided on the housing; when the data collected by the data acquisition module is abnormal, the safety protection module controls the pressure relief solenoid valve to open.

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