Lithium ion battery performance detection equipment

Abstract

A lithium ion battery performance detection device provided by the present invention comprises a base, a composite detection unit, a simulation motion unit and a central control unit, a closed shell of the composite detection unit is movably connected above the base and is provided with a state sensor, and the closed shell is internally provided with a cavity for accommodating a lithium ion battery to be detected. The detection information collector is in signal connection with the lithium ion battery to be detected and the state sensor and is used for collecting various performance parameters of the lithium ion battery and the state of the lithium ion battery in the collection process; the simulation motion unit is in driving connection with the closed shell and is used for driving the closed shell and the lithium ion battery in the closed shell to move; and the central control unit controls the lithium ion battery to keep a set action state in the detection process and controls the environment change of the inner cavity of the closed shell. The lithium ion battery is kept in a motion state, various performance tests are carried out in a set environment, the lithium ion battery use condition of a new energy automobile is met, and the accuracy and comprehensiveness of performance detection are improved.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion battery performance detection, and in particular provides a lithium ion battery performance detection device. Background Art

[0002] With the development of science and technology and the improvement of people's environmental awareness, lithium-ion batteries are increasingly used in people's work and life. All countries are promoting sustainable energy development technologies, and the automotive industry is also vigorously developing green and sustainable new energy as the main energy source. Lithium-ion batteries are most widely used in new energy vehicles, so the stability and reliability of lithium-ion batteries used in new energy vehicles have become the main concerns in the research and development and production process.

[0003] In the process of research and development and production, performance testing is generally used to verify the environmental adaptability of lithium-ion batteries and evaluate the stability of batteries in different environments, including high temperature, low temperature and humidity. At present, there are many performance tests for lithium-ion batteries, but most of them are carried out in an open environment with lithium-ion batteries in static conditions. In the use of new energy vehicles, lithium-ion batteries are in motion such as vibration and swing with the frame. Lithium-ion batteries are made of lithium metal as positive / negative electrode materials and use non-aqueous electrolyte solutions. Studies have shown that there are large differences in the various performances of lithium-ion batteries under static and motion conditions. Therefore, it is difficult to accurately detect the various performances of lithium-ion batteries under motion conditions by using performance tests of lithium-ion batteries placed statically in an open environment. In addition, it is difficult for current testing equipment to accurately perform performance tests on lithium-ion batteries in acid, salt spray, high and low temperature and humidity settings in an open environment, and it is even more impossible to perform performance tests in the above-mentioned specific settings, maintaining vibration, swinging and other conditions. Summary of the invention

[0004] Based on this, the present invention provides a lithium-ion battery performance testing device to perform various performance tests while the lithium-ion battery remains in a moving state and is under set environmental conditions, which is more in line with the use of lithium-ion batteries in new energy vehicles and improves the accuracy and comprehensiveness of performance testing.

[0005] In order to achieve the above-mentioned purpose, the lithium-ion battery performance detection device provided by the present invention includes a base, a composite detection unit, a simulated motion unit and a central control unit. The composite detection unit includes a closed shell and a detection information collector, the closed shell is movably connected to the top of the base and is provided with a state sensor, a cavity for accommodating the lithium-ion battery to be detected is provided inside the closed shell, the detection information collector is connected to the lithium-ion battery to be detected and the state sensor signal, and is configured to collect various performance parameters of the lithium-ion battery and the state in the collection process; the simulated motion unit is connected to the closed shell by driving, and is configured to drive the closed shell and the lithium-ion battery inside to move; the central control unit is connected to the composite detection unit and the simulated motion unit signal, and is configured to control the lithium-ion battery to maintain a set action state during the detection process.

[0006] Furthermore, the closed shell includes an intermediate shell and end supports, the intermediate shell is provided with a cavity for accommodating a lithium-ion battery, the end supports are detachably connected to the two ends of the cavity, each of the end supports is provided with an electrode terminal, the electrodes at both ends of the lithium-ion battery are electrically connected to adjacent electrode terminals, the intermediate shell includes an inner shell and an outer shell arranged concentrically, the outer shell is made of a heat-insulating material, the inner shell is made of a heat-conductive material, the inner shell is provided with a central cavity, the lithium-ion battery to be tested is placed in the central cavity and maintained in a centered state by being supported by the electrode terminals.

[0007] Furthermore, a temperature regulator is connected to the external cavity between the inner shell and the outer shell, and the temperature regulator is configured to adjust the temperature of the external cavity. The central cavity is provided with a temperature detector. The central control unit is connected to the temperature regulator and the temperature detector signal, and is configured to receive and control the output temperature of the temperature regulator according to the temperature detection information.

[0008] Further, the central cavity is connected to a humidity regulator, the central cavity is provided with a humidity detector, the central control unit is connected to the humidity regulator and the humidity detector signal, and is configured to receive and control the output humidity of the humidity regulator according to the humidity detection information, the central cavity is connected to a salt spray sprayer, the central cavity is located at one end away from the salt spray sprayer and is provided with a salt spray concentration detector, the central control unit is connected to the salt spray sprayer and the salt spray concentration detector, and is configured to receive and adjust the salt spray amount according to the salt spray concentration detection information, and the central control unit is provided with a first timer, configured The method comprises the steps of: controlling the salt mist sprayer to spray salt mist into the central cavity according to the interval time set by the first timer; and / or, the central cavity is connected to the acid mist sprayer, an acid mist concentration detector is arranged at one end of the central cavity away from the acid mist sprayer, the central control unit is provided with the acid mist concentration detector, the central control unit is connected to the acid mist sprayer and the acid mist concentration detector, and is configured to receive and adjust the acid mist spraying amount according to the acid mist concentration detection information, and the central control unit is provided with a second timer, and is configured to control the acid mist sprayer to spray acid mist into the central cavity according to the interval time set by the second timer.

[0009] Furthermore, the simulated motion unit includes a circumferential swing mechanism, which includes a swing motor, a driving gear and a driven gear that are meshed with each other, the end shell is provided with an end cavity separated from the central cavity, the swing motor is arranged in the end cavity, the motor shaft extends into the central cavity and is connected to the driving gear, and the driven gear is detachably connected to the outside of the lithium-ion battery.

[0010] Furthermore, the simulated motion unit also includes a vibration mechanism, and the front and rear vibration mechanisms include a front vibration cylinder and a rear vibration cylinder arranged at intervals along the length direction of the base, the cylinder body of the front vibration cylinder is hinged to the front of the base, and the movable rod is hinged to the front of the closed shell, and the cylinder body of the rear vibration cylinder is hinged to the rear of the base, and the movable rod is hinged to the rear of the closed shell; the front vibration cylinder and the rear vibration cylinder independently control the telescopic amplitude and frequency and can be adjusted, and the central control unit is connected to the front vibration cylinder and the rear vibration cylinder, and is configured to respectively control the telescopic amplitude and frequency of the front vibration cylinder and the rear vibration cylinder, so as to respectively control the vibration amplitude and frequency of the front and rear ends of the lithium-ion battery.

[0011] Furthermore, the front-to-back swing mechanism also includes a front spring member and a rear spring member arranged at intervals along the length direction of the base, the front spring member is arranged on the front side of the front vibration cylinder and the lower end is connected to the front of the base, and the upper end is connected to the front of the closed shell, and the rear spring member is arranged on the rear side of the rear vibration cylinder and the lower end is connected to the front of the base, and the upper end is connected to the rear of the closed shell.

[0012] Furthermore, the state sensor includes a vibration sensor fixedly mounted on a closed shell and an angle sensor fixedly mounted on a swing motor. The detection information collector is connected to the vibration sensor and the angle sensor via a flexible connection line and is configured to collect vibration and swing angle information of the lithium-ion battery.

[0013] Compared with the prior art of lithium-ion battery performance testing technology in an open environment and under static conditions, the technical advantages of the lithium-ion battery performance testing device provided by the present invention are at least reflected in:

[0014] In the first aspect, a cavity is constructed in the closed shell of the composite detection unit, and a lithium-ion battery is installed in the cavity. The central control unit controls the change of environmental parameters in the cavity, and a simulation motion unit connected to the closed shell is provided. The central control unit controls the lithium-ion battery to maintain a set action state during the detection process through the simulation motion unit, so as to form a condition in which the lithium-ion battery maintains a motion state and is under set environmental conditions for various performance tests. The information collector collects performance parameters and environmental condition information of the lithium-ion battery, thereby improving the accuracy and comprehensiveness of performance detection.

[0015] On the second aspect, the simulation motion unit is provided with an axial swing mechanism for driving the lithium-ion battery to swing around the central axis, and a vibration mechanism for driving the lithium-ion battery to vibrate back and forth, so that the lithium-ion battery is in a motion environment condition similar to that of a new energy vehicle during high-speed driving during the performance test, replacing the existing lithium-ion battery static detection technology, so that the new energy parameters detected by the detection equipment of the present invention are more in line with the use of lithium-ion batteries in new energy vehicles, and the authenticity of the performance test is improved;

[0016] Thirdly, the composite detection unit is provided with a humidity regulator, a salt spray sprayer and an acid spray sprayer connected to the central cavity where the lithium-ion battery is placed, which can construct a humidity environment, a salt spray environment and an acid spray environment, as well as composite environmental conditions during the lithium-ion battery detection process, thereby realizing the diversity of environmental conditions during the lithium-ion battery detection process, thereby enriching the detection parameters;

[0017] Fourthly, the closed shell is provided with an inner shell and an outer shell, the outer shell is made of a heat-insulating material, the inner shell is made of a heat-conducting material, and a temperature regulator is arranged in the external cavity between the outer shell and the inner shell, and heat is transferred to the lithium-ion battery in the central shell by heat conduction of the inner shell, so that the centrally arranged lithium-ion battery can be heated evenly, and the isolation setting avoids corrosion damage to the temperature regulator by humidity, salt spray and acid spray environment, thereby improving the safety of the detection process.

[0018] In the fifth aspect, the present invention can ensure that the test environment is always maintained within a predetermined set value range by dynamically monitoring and adjusting the salt spray concentration and humidity, making the detection environment more accurate and stable. The salt spray concentration and humidity are detected at intervals set by the first timer, and the environmental conditions are automatically adjusted. This closed-loop control method can adjust the system parameters in real time, keep the environment constant, and avoid manual adjustment errors. By calculating the adjustment parameters based on the relationship between the initial concentration and humidity and the detection data, the fluctuations of salt spray and humidity in the environment can be more accurately controlled, reducing the interference of environmental changes on the test results.

[0019] In the sixth aspect, the present invention can establish a dynamic model through parameters such as initial acid mist concentration, acid mist spraying amount, cavity volume, ventilation speed, etc., and accurately simulate the change process of acid mist concentration, which can more realistically reproduce the change of acid mist concentration in the actual environment, and can adjust the acid mist spraying amount and ventilation speed according to preset time and parameters, so as to dynamically control the environmental conditions in the cavity. The present invention monitors the acid mist concentration value in real time and compares it with the target acid mist concentration value. The system can dynamically calculate the proportional adjustment parameters and accurately adjust the acid mist spraying amount. This precise control can ensure that the acid mist concentration remains stable throughout the experiment, thereby avoiding errors caused by fluctuations in acid mist concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the provided ion battery performance testing device;

[0022] Figure 2 is a front view of an embodiment of the provided ion battery performance testing device;

[0023] Figure 3 is a side view of an embodiment of the provided ion battery performance testing device;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the provided ion battery performance testing equipment after removing some structures;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the closed shell of the provided ion battery performance testing device after removing part of the shell;

[0026] Figure 6 is a front elevation view of the enclosed housing of the provided ion battery performance testing device with part of the housing removed;

[0027] Figure 7 It is a block diagram of the working principle of the provided ion battery performance testing equipment.

[0028] Description of the accompanying drawings:

[0029] 1- Base;

[0030] 21-end support body, 22-electrical terminal, 23-outer shell, 24-driven gear, 25-driving gear, 26-swing motor, 27-camera, 28-electrode terminal, 29-inner shell, 210-detection information collector, 211-temperature regulator, 212-humidity regulator, 213-salt sprayer, 214-acid sprayer;

[0031] 31-front vibration cylinder, 32-rear vibration cylinder;

[0032] 41-front spring member, 42-rear spring member;

[0033] 5- Central control unit;

[0034] 6- Lithium-ion battery. DETAILED DESCRIPTION

[0035] The technical scheme of the present invention is further described in detail below through the accompanying drawings and embodiments. The description of the exemplary embodiments is merely illustrative and is by no means intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art.

[0036] like Figures 1 to 7 As shown, the present invention provides a lithium-ion battery performance detection device, including a base 1, a composite detection unit, a simulated motion unit and a central control unit 5. The composite detection unit includes a closed shell and a detection information collector 210, the closed shell is movably connected above the base 1 and is provided with a state sensor, a cavity for accommodating a lithium-ion battery 6 to be detected is provided inside the closed shell, the detection information collector 210 is connected to the lithium-ion battery 6 to be detected and the state sensor signal, and is configured to collect various performance parameters of the lithium-ion battery 6 and the state in the collection process; the simulated motion unit is connected to the closed shell by driving, and is configured to drive the closed shell and the lithium-ion battery 6 inside to move; the central control unit 5 is connected to the composite detection unit and the simulated motion unit signal, and is configured to control the lithium-ion battery 6 to maintain a set action state during the detection process, and control the change of the inner cavity environment of the closed shell.

[0037] A cavity is constructed in the closed shell of the composite detection unit, and the lithium-ion battery 6 is installed in the cavity. The central control unit 5 controls the changes in environmental parameters in the cavity, and a simulation motion unit connected to the closed shell is provided. The central control unit 5 controls the lithium-ion battery 6 to maintain a set action state during the detection process through the simulation motion unit, thereby forming a performance test condition in which the lithium-ion battery maintains a motion state and is under set environmental conditions. The detection information collector 210 collects performance parameters and environmental condition information of the lithium-ion battery 6, thereby improving the accuracy and comprehensiveness of performance detection.

[0038] Among them, the central control unit controls the changes of environmental parameters in the cavity and controls the action of the composite simulated motion unit, so that the lithium-ion battery is in a set external environment and performs set movements, simulating the scenes used in new energy vehicles. It is the control center of the entire lithium-ion battery performance testing equipment, and can use industrial computers, microcomputers, PLC programmable controllers or artificial intelligence control equipment.

[0039] Among them, the detection information collector 210 is responsible for collecting detection information, which includes the performance parameters of the lithium-ion battery itself, and also includes the external environment information during the lithium-ion battery detection process, such as temperature, humidity, acid mist and salt mist environment information, and the motion state information of the lithium-ion battery during the detection process, such as high-frequency vibration amplitude, vibration frequency, circumferential swing amplitude, swing frequency, etc. The information collector can also be an industrial computer, a microcomputer, etc. In the implementation process, in order to facilitate control operation and information collection, the central control unit can adopt a synthetic structure, that is, a single industrial computer is used to complete control and information collection.

[0040] During the implementation, the simulated motion unit includes a circumferential swing mechanism, which includes a swing motor 26, a driving gear 25 and a driven gear 24 that mesh with each other, the end housing is provided with an end cavity separated from the central cavity, the swing motor 26 is arranged in the end cavity, the motor shaft extends into the central cavity and is connected to the driving gear 25, and the driven gear 24 is detachably connected to the outside of the lithium-ion battery 6. In a specific embodiment, the swing motor 26 can be a stepping servo motor, which can be controlled by a controller to achieve the same small-angle swing in forward and reverse rotations, or a connecting rod mechanism driven by a rotary motor can be used to achieve the angle output of reciprocating swing, driving the lithium-ion battery to swing in a small range of angles, so as to simulate the angle swing scene of the lithium-ion battery on the frame as the new energy vehicle travels.

[0041] Furthermore, the simulated motion unit also includes a vibration mechanism, and the front and rear vibration mechanisms include a front vibration cylinder 31 and a rear vibration cylinder 32 arranged at intervals along the length direction of the base 1, the cylinder body of the front vibration cylinder 31 is hinged to the front of the base 1, and the movable rod is hinged to the front of the closed shell, and the cylinder body of the rear vibration cylinder 32 is hinged to the rear of the base 1, and the movable rod is hinged to the rear of the closed shell. Further, the front vibration cylinder 31 and the rear vibration cylinder 32 independently control the telescopic amplitude and frequency to be adjustable, and the central control unit 5 is connected to the front vibration cylinder 31 and the rear vibration cylinder 32, and is configured to control the telescopic amplitude and frequency of the front vibration cylinder 31 and the rear vibration cylinder 32 respectively, so as to control the front and rear end vibration amplitude and frequency of the lithium-ion battery 6 respectively. The vibration cylinder can be a pneumatic cylinder, a hydraulic cylinder or an electric cylinder, which outputs a small amplitude and high frequency vibration load to simulate the scene where the lithium-ion battery generates high frequency vibration on the frame as the new energy vehicle moves.

[0042] During implementation, the front and rear swing mechanism also includes a front spring member 41 and a rear spring member 42 which are spaced apart along the length direction of the base 1. The front spring member 41 is arranged on the front side of the front vibration cylinder 31, and the lower end is connected to the front of the base 1, and the upper end is connected to the front of the closed shell. The rear spring member 42 is arranged on the rear side of the rear vibration cylinder 32, and the lower end is connected to the front of the base 1, and the upper end is connected to the rear of the closed shell. The use of springs can buffer the vibration intensity of the vibration cylinder, avoid the problem of excessive vibration of the lithium-ion battery and inconsistency with the vibration scene received by the lithium-ion battery on the frame, and improve the accuracy of the simulation.

[0043] The state sensor includes a vibration sensor fixedly mounted on the closed housing and an angle sensor fixedly mounted on the swing motor 26. The detection information collector 210 is connected to the vibration sensor and the angle sensor via a flexible connection line, and is configured to collect vibration and swing angle information of the lithium-ion battery 6. The angle sensor and the vibration sensor are mature components of the prior art, and are not described in detail.

[0044] Based on the above implementation process, the simulation motion unit is provided with an axial swing mechanism for driving the lithium-ion battery 6 to swing around the central axis, and a vibration mechanism for driving the lithium-ion battery 6 to vibrate back and forth, so that the lithium-ion battery 6 is in a motion environment condition similar to that of the new energy vehicle during high-speed driving during the performance test, replacing the static detection technology of the lithium-ion battery in the prior art, so that the new energy parameters detected by the detection equipment of the present invention are more in line with the use of lithium-ion batteries in new energy vehicles, thereby improving the authenticity of the performance test.

[0045] like Figure 7As shown, in the implementation process, the closed housing includes an intermediate housing and an end support body 21, the intermediate housing is provided with a cavity for accommodating the lithium-ion battery 6, the end support bodies 21 are detachably connected to the two ends of the cavity, and each of the end support bodies 21 is provided with an electrode terminal 28, and the electrodes at both ends of the lithium-ion battery 6 are electrically connected to the adjacent electrode terminals 28. The intermediate housing includes an inner housing 29 and an outer housing 23 arranged concentrically, the outer housing 23 is made of a heat-insulating material, the inner housing 29 is made of a heat-conducting material, and the inner housing 29 is provided with a central cavity, and the lithium-ion battery 6 to be tested is placed in the central cavity and supported by the electrode terminals 28 to maintain a centered state. The closed shell is provided with an inner shell 29 and an outer shell 23, wherein the outer shell 23 is made of a heat-insulating material, and the inner shell 29 is made of a heat-conducting material, and a temperature regulator 211 is arranged in the external cavity between the outer shell 23 and the inner shell 29, and heat is transferred to the lithium-ion battery in the central shell by heat conduction of the inner shell, so that the centrally arranged lithium-ion battery can be heated evenly, and the isolation setting avoids corrosion damage to the temperature regulator 211 caused by humidity, salt spray and acid spray environment, thereby improving the safety of the detection process.

[0046] In some embodiments, the external cavity between the inner shell 29 and the outer shell 23 is connected to a temperature regulator 211, and the temperature regulator 211 is configured to adjust the temperature of the external cavity. The central cavity is provided with a temperature detector. The central control unit 5 is connected to the temperature regulator 211 and the temperature detector signal, and is configured to receive and control the output temperature of the temperature regulator 211 according to the temperature detection information. Further, the central cavity is connected to a humidity regulator 212, and the central cavity is provided with a humidity detector. The central control unit 5 is connected to the humidity regulator 212 and the humidity detector signal, and is configured to receive and control the output humidity of the humidity regulator 212 according to the humidity detection information. The temperature regulator may include a heating function and a cooling function, and plays a role in adjusting the ambient temperature of the lithium-ion battery.

[0047] The central cavity is connected to a salt mist sprayer 213, and a salt mist concentration detector is provided at one end of the central cavity away from the salt mist sprayer 213. The central control unit 5 is connected to the salt mist sprayer 213 and the salt mist concentration detector, and is configured to receive and adjust the salt mist spraying amount according to the salt mist concentration detection information. The central control unit is provided with a first timer, and is configured to control the salt mist sprayer 213 to spray salt mist into the central cavity according to the interval time set by the first timer; the central cavity is connected to an acid mist sprayer 214, and an acid mist concentration detector is provided at one end of the central cavity away from the salt mist sprayer 213. The central control unit is provided with an acid mist concentration detector. The central control unit 5 is connected to the acid mist sprayer 214 and the acid mist concentration detector, and is configured to receive and adjust the acid mist spraying amount according to the acid mist concentration detection information. The central control unit is provided with a second timer, and is configured to control the acid mist sprayer 214 to spray acid mist into the central cavity according to the interval time set by the second timer. The salt sprayer sprays salt spray around the lithium-ion battery to test the working performance of the lithium-ion battery in a salty corrosive environment. The acid sprayer sprays acid spray around the lithium-ion battery to test the working performance of the lithium-ion battery in an acidic corrosive environment.

[0048] Based on the above embodiment, the composite detection unit is provided with a humidity regulator 212, a salt mist sprayer 213 and an acid mist sprayer 214 connected to the central cavity where the lithium-ion battery is placed, which can construct a humidity environment, a salt mist environment and an acid mist environment, as well as composite environmental conditions during the lithium-ion battery detection process, thereby realizing the diversity of environmental conditions during the lithium-ion battery detection process, thereby enriching the detection parameters.

[0049] In some embodiments, the salt mist concentration detector is used to obtain the initial salt mist concentration in the central cavity and the detected salt mist concentration at the interval time set by the first timer, and obtain the salt mist concentration adjustment parameter according to the initial salt mist concentration, the detected salt mist concentration and the time interval. The humidity regulator 212 is used to obtain the initial humidity in the central cavity and the detected humidity at the interval time set by the first timer, and obtain the humidity adjustment parameter according to the detected humidity, the initial humidity and the time interval. The central control unit 5 is used to obtain the real-time humidity and the initial atomization speed in the central cavity, and calculate the real-time atomization speed according to the real-time humidity, the initial atomization speed and the initial humidity, wherein the calculation formula is: S(WS)=C(WS)*{1+γ*[S(SD)-C(SD)]}; wherein S(WS) represents the real-time atomization speed, C(WS) represents the initial atomization speed, γ represents the first weight, S(SD) represents the real-time humidity, and C(SD) represents the initial humidity. degree; the humidity regulator is used to obtain the target humidity and real-time humidity in the central cavity, the central control unit 5 is used to obtain the temperature in the central cavity, the target atomization speed and the interval time set by the first timer, and calculate the salt spray amount according to the interval time, temperature, target atomization speed, target humidity, real-time atomization speed, detected salt spray concentration and real-time humidity, wherein the calculation formula is: Y(PS)=∈*J(YW)*{1+δ*[M(SD)-S(SD)]}*S(JG)*W(D)*{1+θ*[M(WS)-S(WS)]}; wherein, Y(PS) represents the salt spray amount, ∈ represents the salt spray concentration adjustment parameter, J(YW) represents the detected salt spray concentration, δ represents the humidity adjustment parameter, M(SD) represents the target humidity, S(SD) represents the real-time humidity, S(JG) represents the interval time, W(D) represents the temperature, θ represents the second weight, M(WS) represents the target atomization speed, and S(WS) represents the real-time atomization speed.

[0050] Based on the above embodiments, the present invention obtains the initial salt mist concentration in the central cavity and the detected salt mist concentration at the interval time set by the first timer, and obtains the salt mist concentration adjustment parameter according to the initial salt mist concentration, the detected salt mist concentration and the time interval. The present invention obtains the initial humidity in the central cavity and the detected humidity at the interval time set by the first timer, and obtains the humidity adjustment parameter according to the detected humidity, the initial humidity and the time interval. By dynamically monitoring and adjusting the salt mist concentration and humidity, it can be ensured that the test environment is always maintained within the predetermined set value range, especially in an open environment, due to the continuous changes in external factors (such as air flow, climate change, etc.), traditional detection It is often difficult for equipment to stably maintain ideal test conditions. Using real-time data to adjust salt spray concentration and humidity adjustment parameters can effectively eliminate the impact of external environmental changes, making the detection environment more accurate and stable. The salt spray concentration and humidity are detected at intervals set by the first timer, and the environmental conditions are automatically adjusted. This closed-loop control method can adjust system parameters in real time, keep the environment constant, and avoid manual adjustment errors. The performance test of lithium-ion batteries in extreme environments such as acid, salt spray, high and low temperature and humidity requires the ability to accurately reproduce real environmental conditions. By continuously monitoring and adjusting salt spray concentration and humidity, it can be closer to the actual environment and improve the authenticity of the test results. For example, salt spray concentration and humidity are important factors that affect the corrosion, internal resistance, cycle life and other performance of lithium-ion batteries. Real-time monitoring of changes in these parameters can ensure that the test results are more consistent with the actual use environment. In an open environment, the equipment cannot guarantee long-term stability and accuracy. By adjusting the salt spray concentration and humidity in real time, the required environmental conditions can be maintained during long-term testing to avoid data deviations caused by environmental fluctuations. By calculating the adjustment parameters based on the relationship between the initial concentration and humidity and the test data, the fluctuations of salt spray and humidity in the environment can be more accurately controlled, reducing the interference of environmental changes on the test results.This can improve the reliability of battery performance test data, making the test results more repeatable and scientific. By detecting the changing trends of salt spray concentration and humidity, possible errors can be dynamically adjusted to correct possible deviations. Through the automated adjustment mechanism, the equipment can automatically adjust according to real-time detection data, reducing errors and labor intensity of manual operation, thereby improving test efficiency and reliability of equipment operation. By using real-time calculation of adjustment parameters, real-time feedback can be provided to operators, and possible environmental deviations can be warned in advance to avoid sudden errors in testing. The present invention obtains the real-time humidity and initial atomization speed in the central cavity. The real-time atomization speed is calculated according to the real-time humidity, the initial atomization speed and the initial humidity. The present invention obtains the target humidity and the real-time humidity in the central cavity, the temperature in the central cavity, the target atomization speed and the interval time set by the first timer, and calculates the salt spray amount according to the interval time, the temperature, the target atomization speed, the target humidity, the real-time atomization speed, the detected salt spray concentration and the real-time humidity. When calculating the real-time atomization speed, the real-time humidity, the initial atomization speed and the initial humidity need to be dimensionally removed or normalized. Similarly, when calculating the salt spray amount, the interval time, the temperature, the target atomization speed, the target humidity, the real-time atomization speed, the detected salt spray concentration and the real-time humidity also need to be normalized. The salt spray concentration and the real-time humidity are dimensionally removed or normalized, so that the central control unit 5 controls the salt spray sprayer 213 to spray salt spray into the central cavity according to the salt spray amount and the interval time set by the first timer. The above method can dynamically control the environmental conditions by obtaining the humidity, atomization speed, target humidity and atomization speed in the central cavity in real time, and calculating and adjusting the atomization speed in real time, so as to ensure that the simulated environment (such as humidity, temperature, salt spray concentration, etc.) is always in the set ideal state during the experiment, avoiding errors caused by environmental changes during the experiment, thereby improving the accuracy and reliability of the test. The spraying amount is controlled according to the interval time set by the first timer to ensure that the concentration of salt spray in the simulated environment is consistent with the actual set target. The salt spray concentration is very critical to the corrosion test of lithium-ion batteries. Therefore, accurate control of the salt spray amount can more realistically reproduce the use conditions of the battery in a specific environment, thereby helping to evaluate the durability and stability of the battery in an acidic or high-salt environment. Lithium-ion batteries may exhibit different electrical properties and safety under different environmental conditions (such as humidity, salt spray, temperature, etc.). By adjusting these environmental factors in real time, the performance of the battery in a real working environment can be more accurately simulated, providing more accurate performance evaluation data.For example, the battery may short-circuit, corrode, etc. in a high humidity or salt spray environment. Through this method, these potential problems can be systematically evaluated. The central control unit 5 of the present invention calculates and automatically adjusts environmental parameters according to real-time data, making the test equipment more intelligent. Compared with traditional manual control or inflexible environmental simulation systems, it can respond to environmental changes more accurately and adapt to different experimental needs. In particular, the automatic adjustment capability in complex environments improves the automation level and test efficiency of the overall system. In general, this method can provide a more accurate and reliable detection means for the performance test of lithium-ion batteries in complex environments, especially under the simulation of multiple factors such as salt spray, humidity and temperature. By real-time control of humidity, atomization speed and salt spray amount, the accuracy of environmental simulation and the credibility of experimental results can be greatly improved, providing more powerful support for battery research and development, production and quality control.

[0051] In some embodiments, the acid mist concentration detector is used to obtain the initial acid mist concentration value in the central cavity, the acid mist sprayer 214 is used to obtain the acid mist spraying amount at the first preset time, and the central control unit 5 is used to obtain the cavity volume and ventilation speed of the central cavity. The central control unit 5 is also used to calculate the rate of change of the acid mist concentration value over time based on the initial acid mist concentration value, the acid mist spraying amount, the cavity volume, the ventilation speed and the first preset time, wherein the calculation formula is: Wherein, S(BH) represents the rate of change of the acid mist concentration value over time, S(WL) represents the acid mist spraying amount, C(ND) represents the initial acid mist concentration value, Y(SJ) represents the first preset time, T(SD) represents the ventilation speed, K(TJ) represents the cavity volume, α represents the third weight, and β represents the fourth weight; the acid mist concentration detector obtains the real-time acid mist concentration value and the target acid mist concentration value at multiple second preset times according to the rate of change of the acid mist concentration value over time, and the central control unit 5 calculates the proportional adjustment parameter according to the multiple target acid mist concentration values ​​and the real-time acid mist concentration value, wherein the calculation formula is: Among them, B(TC) represents the proportional adjustment parameter, M(ND) k Indicates the kth target acid mist concentration value, S(ND) k represents the kth real-time acid mist concentration value, N represents the number of real-time acid mist concentration values, and k represents the sequence number of the real-time acid mist concentration value; the central control unit 5 controls the acid mist sprayer 214 to spray acid mist into the central cavity through the proportional adjustment parameter and according to the interval time set by the second timer.

[0052] Based on the above embodiments, the present invention obtains the initial acid mist concentration value in the central cavity, the acid mist spraying amount at the first preset moment, the cavity volume and the ventilation speed of the central cavity, and then calculates the rate of change of the acid mist concentration value over time according to the initial acid mist concentration value, the acid mist spraying amount, the cavity volume, the ventilation speed and the first preset moment, wherein, before calculating the rate of change of the acid mist concentration value over time, the initial acid mist concentration value, the acid mist spraying amount, the cavity volume, the ventilation speed and the first preset moment need to be dimensionally removed or normalized, and by calculating the rate of change of the acid mist concentration over time, using parameters such as the initial acid mist concentration, the acid mist spraying amount, the cavity volume, the ventilation speed, etc., a dynamic model can be established to accurately simulate the change process of the acid mist concentration, which can be more realistic. The concentration change of acid mist in the actual environment is reproduced on the spot to avoid inaccurate control caused by human intervention or equipment error. Lithium-ion batteries may have different chemical reactions and performance changes under different environmental conditions (such as acidity, salt spray, etc.). This method can simulate the changes of various environmental factors, such as acid mist concentration, humidity, etc., so as to achieve more accurate testing and evaluation. Through system calculation, the acid mist spraying amount and ventilation speed can be adjusted according to the preset time and parameters, so as to dynamically control the environmental conditions in the cavity. This method can automatically compensate for environmental changes and ensure the stability and repeatability of environmental conditions. In an open environment, conditions such as airflow, temperature, and humidity will change at any time, making it difficult to maintain a constant test environment. The present invention Various environmental factors can be accurately controlled in a closed cavity. Through an automated calculation and adjustment mechanism, errors caused by human factors can be reduced, interference from external factors can be avoided, and the reliability, accuracy and consistency of the test results can be improved. By continuously calculating the change in acid mist concentration and the corresponding environmental adjustment, the performance of the battery exposed to a specific environment for a long time can be dynamically monitored, and a more comprehensive and systematic performance evaluation result can be obtained. In addition, the present invention can also simultaneously simulate the comprehensive influence of multiple environmental factors (such as acid mist, temperature and humidity, etc.) on the performance of the lithium-ion battery. For example, in a closed cavity, different acid mist concentrations, humidity, temperature and other conditions can be adjusted to simulate the performance of the battery in a complex environment, so that the test results are more comprehensive and can reflect The present invention obtains the real-time acid mist concentration value and the target acid mist concentration value at multiple second preset moments through the rate of change of the acid mist concentration value over time, and calculates the proportional adjustment parameter through the multiple target acid mist concentration values ​​and the real-time acid mist concentration value. When calculating the proportional adjustment parameter, the multiple target acid mist concentration values ​​and the real-time acid mist concentration value need to be dimensionally removed or normalized first, so that the central control unit 5 controls the acid mist sprayer 214 to spray acid mist into the central cavity through the proportional adjustment parameter and according to the interval time set by the second timer. By monitoring the acid mist concentration value in real time and comparing it with the target acid mist concentration value, the system can dynamically calculate the proportional adjustment parameter and accurately adjust the acid mist spraying amount.This precise control can ensure that the acid mist concentration remains stable throughout the experiment, thereby avoiding errors caused by fluctuations in the acid mist concentration. The acid mist concentration is a key parameter for testing lithium-ion batteries in an acidic environment, which directly affects the corrosion and performance degradation of the battery. Therefore, this method can simulate a more realistic and accurate acidic environment in an open or complex environment to ensure that the test results reflect the performance of the battery under actual use conditions. In an open environment, factors such as acid mist concentration, temperature and humidity, and airflow are usually unstable and may interfere with the experimental results. Through this method, the system can adjust the acid mist spraying amount based on real-time concentration data and target values ​​to avoid unnecessary effects of changes in the external environment on the experiment, thereby improving the stability of environmental control. The central control unit 5 adjusts the spraying amount according to the deviation between the real-time acid mist concentration and the target concentration, which can ensure that the acid mist concentration is always within the preset ideal range without being affected by fluctuations in the external environment. The difference between the real-time acid mist concentration value and the target acid mist concentration value at multiple second preset moments is used to calculate the proportional adjustment parameter, thereby achieving precise control. This method can eliminate the problem of inaccurate concentration caused by environmental fluctuations or human errors, and can ensure that the change process of the acid mist concentration in each test is consistent, thereby enhancing the experimental results. The repeatability of the results, acid mist, salt mist, temperature, humidity and other environmental factors affect each other. It is difficult for traditional testing equipment to accurately simulate these complex environments that interact with each other. By using proportional adjustment parameters and timer intervals, the changes of each environmental parameter can be accurately controlled to simulate an environment that is more in line with actual use conditions. Therefore, the present invention provides the ability to accurately control the concentration of acid mist, solves the problem of existing detection equipment controlling environmental stability and test accuracy in an open environment, and through proportional adjustment and timer interval control, more accurate and repeatable tests can be performed under simulated complex environmental conditions, providing higher quality data support for the performance evaluation of lithium-ion batteries, thereby promoting the progress of battery research and development, production and quality control.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A lithium-ion battery performance testing device, characterized in that: include: Base (1); The composite detection unit comprises a closed housing and a detection information collector (210), wherein the closed housing is movably connected to the top of the base (1) and is provided with a state sensor, a cavity for accommodating a lithium ion battery (6) to be detected is provided inside the closed housing, and the detection information collector (210) is connected to the lithium ion battery (6) to be detected and the state sensor signal, and is configured to collect various performance parameters of the lithium ion battery (6) and the state during the collection process; A simulated motion unit is drivingly connected to the closed housing and is configured to drive the closed housing and the lithium-ion battery (6) therein to move; as well as The central control unit (5) is connected to the composite detection unit and the analog motion unit signal, and is configured to control the lithium-ion battery (6) to maintain a set action state during the detection process, and to control the change of the inner cavity environment of the closed shell.

2. The lithium-ion battery performance testing device according to claim 1, characterized in that: The closed shell comprises an intermediate shell and an end support body (21), the intermediate shell is provided with a cavity for accommodating a lithium-ion battery (6), the end support bodies (21) are detachably connected to the two ends of the cavity, each of the end support bodies (21) is provided with an electrode terminal (28), and the electrodes at both ends of the lithium-ion battery (6) are respectively electrically connected to the adjacent electrode terminals (28), the intermediate shell comprises an inner shell (29) and an outer shell (23) arranged concentrically, the outer shell (23) is made of a heat-insulating material, the inner shell (29) is made of a heat-conducting material, the inner shell (29) is provided with a central cavity, the lithium-ion battery (6) to be tested is placed in the central cavity and is supported by the electrode terminals (28) to maintain a centered state.

3. The lithium-ion battery performance testing device according to claim 2, characterized in that: The external cavity between the inner shell (29) and the outer shell (23) is connected to a temperature regulator (211), and the temperature regulator (211) is configured to regulate the temperature of the external cavity. The central cavity is provided with a temperature detector. The central control unit (5) is connected to the temperature regulator (211) and the temperature detector signal, and is configured to receive and control the output temperature of the temperature regulator (211) according to the temperature detection information.

4. The lithium-ion battery performance testing device according to claim 3, characterized in that: The central cavity is connected to a humidity regulator (212), a humidity detector is provided in the central cavity, the central control unit (5) is connected to the humidity regulator (212) and the humidity detector by signal, and is configured to receive and control the output humidity of the humidity regulator (212) according to humidity detection information, the central cavity is connected to a salt mist sprayer (213), a salt mist concentration detector is provided at one end of the central cavity away from the salt mist sprayer (213), the central control unit (5) is connected to the salt mist sprayer (213) and the salt mist concentration detector, and is configured to receive and adjust the salt mist spraying amount according to the salt mist concentration detection information, the central control unit (5) is provided with a first timer, and is configured to control the salt mist sprayer (213) to spray salt mist into the central cavity according to the interval time set by the first timer; and / or, The central cavity is connected to an acid mist sprayer (214); an acid mist concentration detector is arranged at one end of the central cavity away from the acid mist sprayer (214); the central control unit (5) is provided with the acid mist concentration detector; the central control unit (5) is connected to the acid mist sprayer (214) and the acid mist concentration detector, and is configured to receive and adjust the acid mist spraying amount according to acid mist concentration detection information; the central control unit (5) is provided with a second timer, and is configured to control the acid mist sprayer (214) to spray acid mist into the central cavity according to the interval time set by the second timer.

5. The lithium-ion battery performance testing device according to claim 4, characterized in that: The salt mist concentration detector is used to obtain the initial salt mist concentration in the central cavity and the detected salt mist concentration at the interval time set by the first timer, and obtain the salt mist concentration adjustment parameter according to the initial salt mist concentration, the detected salt mist concentration and the time interval. The humidity regulator (212) is used to obtain the initial humidity in the central cavity and the detected humidity at the interval time set by the first timer, and obtain the humidity adjustment parameter according to the detected humidity, the initial humidity and the time interval. The central control unit (5) is used to obtain the real-time humidity and the initial atomization speed in the central cavity, and calculate the real-time atomization speed according to the real-time humidity, the initial atomization speed and the initial humidity.

6. The lithium-ion battery performance testing device according to claim 4, characterized in that: The acid mist concentration detector is used to obtain an initial acid mist concentration value in the central cavity; the acid mist sprayer (214) is used to obtain an acid mist spraying amount at a first preset time; the central control unit (5) is used to obtain a cavity volume and a ventilation speed of the central cavity; the central control unit (5) is further used to calculate a time rate of change of the acid mist concentration value according to the initial acid mist concentration value, the acid mist spraying amount, the cavity volume, the ventilation speed and the first preset time; the central control unit (5) controls the acid mist sprayer (214) to spray acid mist into the central cavity through the proportional adjustment parameter and according to an interval time set by a second timer.

7. The lithium-ion battery performance testing device according to claim 1, characterized in that: The simulated motion unit comprises a circumferential swing mechanism, which comprises a swing motor (26), a driving gear (25) and a driven gear (24) meshing with each other, the end shell is provided with an end cavity separated from the central cavity, the swing motor (26) is arranged in the end cavity, the motor shaft extends into the central cavity and is connected to the driving gear (25), and the driven gear (24) is detachably connected to the outside of the lithium-ion battery (6).

8. The lithium-ion battery performance testing device according to claim 7, characterized in that: The simulated motion unit also includes a vibration mechanism, wherein the front and rear vibration mechanisms include a front vibration cylinder (31) and a rear vibration cylinder (32) arranged at intervals along the length direction of the base (1); the cylinder body of the front vibration cylinder (31) is hinged to the front of the base (1), and the movable rod is hinged to the front of the closed shell; the cylinder body of the rear vibration cylinder (32) is hinged to the rear of the base (1), and the movable rod is hinged to the rear of the closed shell; the front vibration cylinder (31) and the rear vibration cylinder (32) are independently controlled to have adjustable extension and contraction amplitudes and frequencies; the central control unit (5) is control-connected to the front vibration cylinder (31) and the rear vibration cylinder (32), and is configured to respectively control the extension and contraction amplitudes and frequencies of the front vibration cylinder (31) and the rear vibration cylinder (32), so as to respectively control the front and rear end vibration amplitudes and frequencies of the lithium-ion battery (6).

9. The lithium-ion battery performance testing device according to claim 8, characterized in that: The front-to-back swing mechanism further comprises a front spring member (41) and a rear spring member (42) arranged at intervals along the length direction of the base (1); the front spring member (41) is arranged at the front side of the front vibration cylinder (31) and the lower end is connected to the front part of the base (1) and the upper end is connected to the front part of the closed shell; the rear spring member (42) is arranged at the rear side of the rear vibration cylinder (32) and the lower end is connected to the front part of the base (1) and the upper end is connected to the rear part of the closed shell.

10. The lithium-ion battery performance testing device according to claim 1, characterized in that: The state sensor comprises a vibration sensor fixedly mounted on the closed housing and an angle sensor fixedly mounted on the swing motor (26); the detection information collector (210) is connected to the vibration sensor and the angle sensor via a flexible connection line and is configured to collect vibration and swing angle information of the lithium-ion battery (6); and / or, The composite detection unit is also provided with a camera arranged toward the lithium-ion battery, and the detection information collector (210) is connected to the camera via a flexible connection line to collect image information of the lithium-ion battery in real time in a closed state.

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