Power battery factory safety intelligent rapid detection evaluation system and method

Abstract

The application discloses a kind of power battery factory safety intelligent fast detection evaluation system and method, the system includes detection evaluation device and man-machine interactive terminal, detection evaluation device is portable and includes battery communication module, temperature acquisition module, central processing unit, energy storage power supply module, wireless communication module and portable machine box, battery communication module, central processing unit, energy storage power supply module and wireless communication module are all arranged in portable machine box, battery communication module, temperature acquisition module, energy storage power supply module and wireless communication module connect central processing unit, one end of battery communication cable is led to outside portable machine box, and central processing unit is connected with man-machine interactive terminal and enterprise manufacturing database by wireless communication module.This application is portable, without connecting a variety of equipment and external power supply, simplify operation time, suitable for large-area storage and other no power supply condition place, also provides an evaluation method that whether battery exists hidden danger is intelligently and effectively evaluated.

Description

Technical Field

[0001] This invention belongs to the field of power battery factory safety testing and evaluation technology, specifically, it relates to an intelligent rapid testing and evaluation system and method for power batteries. Background Technology

[0002] After production, power batteries are typically stored in a temporary warehouse. Only after passing factory testing and evaluation can they be transported by truck to the electric vehicle assembly plant. Because batteries are considered hazardous goods, and power batteries, with their larger capacity and higher risk, are subject to frequent bumps and vibrations during transport, potentially triggering fires due to potential battery hazards, factory testing and evaluation are essential procedures for battery factories to ensure safe transport. Currently, the industry-standard factory testing system consists of a laptop, battery communication module, BMS data query software, and BMS power supply. An experienced technical engineer is required to connect the computer, communication module, and power supply on-site, powered by an external 220V AC mains power supply, and use the software to manually determine whether the battery pack meets factory requirements by reading information such as battery SOC (safe transport requirement: SOC ≤ 50%) and insulation resistance value (to determine insulation faults). It typically takes about 15 minutes to test a power battery from the moment the connection cable is connected to the test results. Furthermore, it is difficult for humans to effectively determine whether the battery has any internal short circuit hazards that could easily trigger a fire based on information such as SOC and insulation resistance values. Summary of the Invention

[0003] The purpose of this invention is to provide a smart and rapid safety testing and evaluation system and method for power batteries, so as to realize the intelligence, speed and effectiveness of testing and evaluation in the context of power battery factory evaluation.

[0004] To achieve the above objectives, the present invention provides a power battery factory safety intelligent rapid testing and evaluation system, comprising a testing and evaluation device, wherein the testing and evaluation device includes a battery communication module, the battery communication module includes a battery communication cable, and is characterized in that it further includes a human-machine interaction terminal. The testing and evaluation device is portable and further includes a temperature acquisition module, a central processing unit, an energy storage power supply module, a wireless communication module, and a portable chassis. The battery communication module, the central processing unit, the energy storage power supply module, and the wireless communication module are all housed within the portable chassis. The battery communication module, the temperature acquisition module, the energy storage power supply module, and the wireless communication module are connected to the central processing unit. One end of the battery communication cable extends outside the portable chassis. The central processing unit is connected to the human-machine interaction terminal and the enterprise manufacturing database through the wireless communication module.

[0005] In one embodiment of the above-mentioned intelligent rapid safety testing and evaluation system for power batteries, the central processing unit includes a basic evaluation module, which includes a basic value acquisition unit and a basic value analysis unit connected to the basic value acquisition unit. The basic value acquisition unit is connected to the battery communication cable to obtain the SOC value and insulation resistance value of the power battery under test. The basic value analysis unit determines whether the SOC value and insulation resistance value of the power battery under test are within the safe range of the power battery under the same coding value.

[0006] In one embodiment of the aforementioned intelligent rapid safety testing and evaluation system for power batteries, the temperature acquisition module is disposed on the outer surface of the portable chassis.

[0007] In one embodiment of the above-mentioned intelligent rapid safety testing and evaluation system for power batteries, the central processing unit further includes a temperature evaluation module. The temperature evaluation module includes a temperature acquisition unit and a temperature difference analysis unit connected to the temperature acquisition unit. The temperature acquisition unit is connected to the temperature acquisition module and the battery communication cable to obtain the ambient temperature and the battery temperature of the power battery to be tested. The temperature difference analysis unit determines whether the battery temperature is not higher than the ambient temperature.

[0008] In one embodiment of the aforementioned intelligent rapid safety testing and evaluation system for power batteries, the temperature evaluation module further includes a battery temperature trend analysis unit for determining whether the battery temperature has an upward trend.

[0009] In one embodiment of the aforementioned intelligent rapid safety testing and evaluation system for power batteries, the central processing unit further includes a pressure evaluation module. The pressure evaluation module includes a battery voltage acquisition unit, a standard voltage acquisition unit, and a differential pressure analysis unit. The battery voltage acquisition unit is connected to the battery communication cable to obtain the voltage of the power battery cell to be tested. The standard voltage acquisition unit connects to the enterprise manufacturing database through the wireless communication module to obtain the standard power battery cell voltage. The differential pressure analysis unit determines whether the voltage difference between the power battery cell to be tested and the standard power battery cell voltage is within the safe range.

[0010] In one embodiment of the aforementioned intelligent rapid safety testing and evaluation system for power batteries, the differential pressure analysis unit determines whether the voltage differences between the highest voltage, lowest voltage, and average voltage of the power battery cell under test and the highest voltage, lowest voltage, and average voltage of the standard power battery cell are within the safe range.

[0011] The intelligent and rapid safety testing and evaluation method for power batteries provided by this invention includes the following steps:

[0012] Pre-test preparation steps: Power on the portable testing and evaluation device, connect it to the enterprise manufacturing database and human-machine interaction terminal, and connect the communication cable of the portable testing and evaluation device to the power battery to be tested.

[0013] The detection and evaluation process involves sending a start command through the human-computer interaction terminal to activate the portable detection and evaluation device and begin detection and evaluation until the human-computer interaction terminal displays the detection data and evaluation conclusions.

[0014] The testing and evaluation process ends when a termination command is sent via the human-machine interface terminal to disconnect the communication cable of the portable testing and evaluation device from the power battery under test, thus ending the testing.

[0015] In one embodiment of the above-mentioned intelligent rapid safety testing and evaluation method for power batteries, the testing and evaluation steps include: a first-level basic evaluation stage, obtaining the code, SOC value and insulation resistance value of the power battery to be tested, analyzing whether the SOC value is less than the set safety threshold of the power battery under the code, analyzing whether the insulation resistance value is greater than the set safety threshold of the power battery under the code, if it is false, the evaluation is unqualified, if it is true, proceed to the next step of evaluation.

[0016] In one embodiment of the above-mentioned intelligent rapid safety testing and evaluation method for power batteries, the testing and evaluation steps include: a two-stage temperature rise evaluation stage, obtaining the highest internal temperature value and ambient temperature value of the power battery under test, analyzing whether the highest internal temperature value of the power battery under test is close to the ambient temperature value and has no upward trend, determining whether the power battery has experienced an internal short circuit causing the temperature rise, and if it is false, the evaluation is unqualified; if it is true, proceed to the next step of evaluation.

[0017] In one embodiment of the above-mentioned intelligent rapid safety testing and evaluation method for power batteries, the testing and evaluation steps include: a three-level differential voltage evaluation stage, obtaining the highest voltage, lowest voltage, and average voltage of the power battery cell to be tested, obtaining the highest voltage, lowest voltage, and average voltage of the power battery test data cell with the same code in the enterprise's manufacturing database, calculating whether the voltage difference before and after the above voltages is less than a set safety threshold, and determining whether the power battery has experienced an internal short circuit or a voltage drop caused by weak insulation. If it is false, the evaluation is unqualified; if it is true, the final evaluation is qualified.

[0018] In one embodiment of the above-mentioned intelligent rapid testing and evaluation method for the safety of power batteries before shipment, the portable testing and evaluation device is connected to multiple power batteries to be tested simultaneously to perform factory safety testing.

[0019] The beneficial effects of this invention are that it does not require connection to multiple devices and external power supply, which not only simplifies the detection operation time and is applicable to places without power supply conditions such as large-area warehouses, but also provides an intelligent and effective assessment method for evaluating whether there are potential hazards in batteries.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection structure of the intelligent rapid safety testing and evaluation system for power batteries at the factory of the present invention, showing its working state.

[0022] Figure 2 This is a schematic diagram of the testing and evaluation device of the intelligent rapid safety testing and evaluation system for power batteries at the factory of the present invention.

[0023] Figure 3 This is a block diagram of the testing and evaluation device of the intelligent rapid safety testing and evaluation system for power batteries at the factory, as described in this invention.

[0024] Figure 4 This is a module diagram of the central processing unit of the intelligent rapid safety testing and evaluation system for power batteries at the factory, as described in this invention.

[0025] Figure 5 This is a flowchart illustrating the intelligent and rapid safety testing and evaluation method for power batteries at the factory, as described in this invention.

[0026] Among them, the attached figures are labeled

[0027] 10: Intelligent and rapid safety testing and evaluation system for power batteries before shipment

[0028] 100: Testing and Evaluation Device

[0029] 110: Battery Communication Module

[0030] 120: Temperature acquisition module

[0031] 130: Central Processing Unit

[0032] 131: Data Acquisition and Analysis Module

[0033] 1311: Basic Assessment Module

[0034] 1311a: Basic numerical acquisition unit

[0035] 1311b: Basic Numerical Analysis Unit

[0036] 1312: Temperature Assessment Module

[0037] 1312a: Temperature acquisition unit

[0038] 1312b: Temperature Difference Analysis Unit

[0039] 1312c: Battery Temperature Trend Analysis Unit

[0040] 1313: Stress Assessment Module

[0041] 1313a: Battery voltage acquisition unit

[0042] 1313b: Standard Voltage Acquisition Unit

[0043] 1313c: Differential Pressure Analysis Unit

[0044] 132: Storage Module

[0045] 132: Transmission Module

[0046] 140: Energy Storage Power Supply Module

[0047] 150: Wireless communication module

[0048] 160: Portable chassis

[0049] 200: Human-Computer Interaction Terminal

[0050] 20: Power battery to be inspected Detailed Implementation

[0051] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of the present invention, but it is not intended to limit the scope of protection of the appended claims.

[0052] References to "an embodiment," "embodiment," "example embodiment," etc., in this specification refer to the fact that the described embodiment may include specific features, structures, or characteristics, but not every embodiment must include these specific features, structures, or characteristics. Furthermore, such statements do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in connection with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0053] The specification and subsequent claims use certain terms to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and subsequent claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect means of connection. Indirect electrical connections include connections made through other means.

[0054] like Figure 1As shown, the intelligent rapid safety testing and evaluation system 10 for power batteries of the present invention includes a testing and evaluation device 100 and a human-machine interaction terminal 200. The testing and evaluation device 100 is portable. It is only necessary to connect the portable testing and evaluation device 100 to the power battery 20 to be tested through a communication cable, and the human-machine interaction terminal 200 can be used to test and evaluate whether the power battery 20 to be tested has the safety status for factory transportation.

[0055] In detail, combined Figures 1 to 3 The power battery factory safety intelligent rapid testing and evaluation system 10 of the present invention includes a testing and evaluation device 100 comprising a battery communication module 110, a temperature acquisition module 120, a central processing unit 130, an energy storage power supply module 140, a wireless communication module 150, and a portable chassis 160. The battery communication module 110, the temperature acquisition module 120, the energy storage power supply module 140, and the wireless communication module 150 are respectively connected to the central processing unit 130. The battery communication module 110, the central processing unit 130, the energy storage power supply module 140, and the wireless communication module 150 are all disposed inside the portable chassis 160. The temperature acquisition module 120 is used for ambient temperature acquisition and can be disposed inside the portable chassis 160. Preferably, the temperature acquisition module 120 is attached to the outer surface of the portable chassis 160.

[0056] The portable chassis 160 assembles the battery communication module 110, temperature acquisition module 120, central processing unit 130, energy storage and power supply module 140, and wireless communication module 150 to form a portable device. The battery communication module 110 connects to the BMS system of the power battery 20 under test to obtain battery BMS data. It includes a battery communication cable 111 extending outside the portable chassis 160 for connection to the BMS system of the power battery 20 under test. The central processing unit 130 connects to the human-machine interface terminal 200 and the enterprise manufacturing database via the wireless communication module 150. The wireless communication module 150 allows the testing and evaluation device 100 to access the enterprise network, connect to the manufacturing database and the human-machine interface terminal 200 via wireless communication, and achieve information transmission. The temperature acquisition module 120 collects the temperature of the environment in which the portable testing and evaluation device 100 is located.

[0057] The intelligent and rapid safety testing and evaluation system 10 for power batteries provided by this invention only requires connecting the portable testing and evaluation device 100 to the power battery 20 under test via the battery communication cable 111 to test and evaluate whether the power battery 20 under test has the safety status for factory transportation. It does not require connecting multiple devices and external power supply, which simplifies the testing operation time. It is suitable for large-area warehouses and other places without power supply conditions, and is convenient, fast and simple.

[0058] Combination Figures 1 to 4The central processing unit 130 is used to collect safety information from the power battery, perform intelligent analysis and judgment, and upload the analysis results to the human-machine interaction terminal 200. Specifically, the central controller 130 includes a data acquisition and analysis module 131, a storage module 132, and a transmission module 133. The data acquisition and analysis module 131 acquires the BMS system safety parameters of the power battery 20 under test through the battery communication module 110, acquires safety parameters from the enterprise manufacturing database through the wireless communication module 150, and acquires the ambient temperature through the temperature acquisition module 120. It analyzes the collected data and performs a safety status assessment. The analysis data from the safety status assessment performed by the data acquisition and analysis module 131 is stored in the storage module 132 and transmitted to the wireless communication module 150 through the transmission module 133, and then uploaded to the human-machine interaction terminal 200 for user viewing.

[0059] The energy storage power supply module 140 is used to store electrical energy and power the BMS system of the testing and evaluation device 100 and the power battery 20 under test. It includes a charging port, a portable energy storage battery, and an output module. The charging port is used to charge the energy storage battery, the portable energy storage battery is used to store electrical energy, and the output module is used to convert the battery electrical energy into the required DC voltage.

[0060] The portable chassis 160 also includes a handle, for example located on the top of the portable chassis 160, to facilitate the overall movement of the portable chassis 160.

[0061] The human-computer interaction terminal 200 is used to initiate detection and evaluation by human-computer interaction with the detection and evaluation device 100, display detection data and evaluation results, and generate an electronic report. The human-computer interaction terminal 200 includes a mobile terminal and a human-computer interaction system. The mobile terminal can be a portable device such as a mobile phone or tablet. The human-computer interaction system is used for human-computer interaction operation and has a start detection button, a display box for showing detection data and evaluation conclusions, and a generate electronic report button. Of course, in other embodiments, the human-computer interaction terminal 200 can also be replaced by a display screen and human-computer interaction system placed on a portable detection and evaluation device.

[0062] The intelligent rapid safety testing and evaluation system 10 for power batteries of the present invention is equipped with a three-level evaluation module to test and evaluate whether the power battery 20 under test has the safety status for factory transportation.

[0063] The acquisition and analysis module 131 of the central processing unit 130 includes a basic evaluation module 1311. The basic evaluation module 1311 includes a basic value acquisition unit 1311a and a basic value analysis unit 1311b. The basic value acquisition unit 1311a is connected to the battery communication cable 111 to obtain the SOC value and insulation resistance value of the power battery under test. The basic value analysis unit 1311b determines whether the SOC value and insulation resistance value of the power battery under test are within the safe range of the power battery under the same coding value.

[0064] The data acquisition and analysis module 131 also includes a temperature assessment module 1312. The temperature assessment module 1312 includes a temperature acquisition unit 1312a and a temperature difference analysis unit 1312b. The temperature acquisition unit 1312a is connected to the temperature acquisition module 120 and the battery communication cable 111 to obtain the ambient temperature and the battery temperature of the power battery under test. The temperature difference analysis unit 1312 determines whether the battery temperature is not higher than the ambient temperature.

[0065] The temperature assessment module 1312 also includes a battery temperature trend analysis unit 1312c for determining whether the battery temperature has an upward trend.

[0066] The data acquisition and analysis module 131 also includes a pressure assessment module 1313. The pressure assessment module 1313 includes a battery voltage acquisition unit 1313a, a standard voltage acquisition unit 1313b, and a differential pressure analysis unit 1313c. The battery voltage acquisition unit 1313a connects to the battery communication cable 111 to obtain the voltage of the power battery cell under test. The standard voltage acquisition unit 1313b connects to the enterprise's manufacturing database via a wireless communication module 150 to obtain the standard power battery cell voltage. The differential pressure analysis unit 1313c determines whether the voltage difference between the power battery cell under test and the standard power battery cell voltage is within a safe range. The standard voltage, for example, refers to the test data of power batteries with the same code in the enterprise's manufacturing database.

[0067] The voltage acquisition and analysis includes the acquisition and analysis of the cell's highest voltage, lowest voltage, and average voltage. Specifically, the differential voltage analysis unit 1313c determines whether the voltage difference between the highest voltage, lowest voltage, and average voltage of the power battery cell under test and the highest voltage, lowest voltage, and average voltage of the standard power battery cell is within a safe range.

[0068] In summary, combining Figure 5 The intelligent rapid safety testing and evaluation method for power batteries at the factory of this invention includes the following steps:

[0069] Pre-test preparation steps: Power on the portable testing and evaluation device, connect it to the enterprise manufacturing database and human-machine interaction terminal, and connect the communication cable of the portable testing and evaluation device to the power battery to be tested.

[0070] The detection and evaluation process involves sending a start command through the human-computer interaction terminal to activate the portable detection and evaluation device and begin detection and evaluation until the human-computer interaction terminal displays the detection data and evaluation conclusions.

[0071] The testing and evaluation process ends when a termination command is sent via the human-machine interface terminal to disconnect the communication cable of the portable testing and evaluation device from the power battery under test, thus ending the testing.

[0072] In practical applications, the testing and evaluation work using the intelligent rapid testing and evaluation system and method for power battery factory safety of the present invention only takes about three minutes. It is not only simple and easy to operate, but also greatly improves the testing efficiency.

[0073] The testing and evaluation process includes a sequential first-level basic evaluation stage, a second-level temperature rise evaluation stage, and a third-level pressure difference evaluation stage. Each stage proceeds only after the previous stage is passed; if a previous stage fails, the evaluation is deemed unqualified. Details are as follows:

[0074] In the first-level basic assessment stage, the battery communication module of the portable testing and assessment device is used to obtain the code, SOC value and insulation resistance value of the power battery under test. It is analyzed whether the SOC value is less than the set safety threshold and whether the insulation resistance value is greater than the set safety threshold. If it is false, the assessment is unqualified. If it is true, the next step of the assessment is carried out, namely the second-level temperature assessment stage.

[0075] In the secondary temperature assessment stage, the highest internal temperature value of the power battery under test and the ambient temperature value collected by the temperature acquisition module are obtained through the battery communication module of the portable testing and assessment device. The analysis is conducted to determine whether the highest temperature value of the battery is not higher than the ambient temperature value and has no upward trend. It is determined whether the power battery has experienced an internal short circuit, which has caused the temperature rise. If the result is false, the assessment is unqualified. If the result is true, the next step of the assessment is carried out, namely the tertiary differential pressure assessment stage.

[0076] In the third-level differential voltage assessment stage, the highest, lowest, and average voltages of the power battery cells under test are obtained through the battery communication module of the portable testing and assessment device, as well as the highest, lowest, and average voltages of the power battery cells with the same code in the enterprise's manufacturing database. The differential voltage (ΔU) before and after the above voltages is calculated to see if it is less than the set safety threshold. It is then determined whether the power battery has experienced an internal short circuit or a voltage drop caused by weak insulation. If it is false, the assessment is unqualified; if it is true, the final assessment is qualified.

[0077] If all three levels of assessment are passed, the human-machine interface terminal will display the test data and the conclusion that the factory safety assessment is qualified. If any level of assessment fails during the step-by-step assessment process, the test data and the conclusion that the factory safety assessment is unqualified will be directly displayed on the human-machine interface terminal, without the need for subsequent assessment processes.

[0078] The present invention can also employ the above method to simultaneously connect a portable testing and evaluation device to multiple power batteries under test for simultaneous factory safety testing.

[0079] The advantages of this invention are:

[0080] (1) This invention provides a portable testing system for the safety assessment of power batteries at the factory, realizing portable testing of power batteries at the factory. Compared with the traditional discrete system consisting of a laptop, battery communication module, data query software, battery BMS power supply and so on, which requires mains power, this system is more integrated and portable. It consists only of a portable testing and assessment device and a human-computer interaction terminal, without the need for external power supply, which is more in line with the requirements for safety testing of batteries in the temporary storage warehouse scenario.

[0081] (2) This invention provides a rapid testing method for power battery factory safety assessment. The traditional method requires a technical engineer to connect multiple cables, debug equipment, operate software to obtain data and make judgments. This method simplifies the process to connecting a communication line and pressing a start button to complete the test. The test time is reduced from about 15 minutes in the traditional method to 3 minutes in the intelligent method, which greatly improves the efficiency of factory assessment testing.

[0082] (3) This invention provides an intelligent assessment method for the safety assessment of power batteries at the factory. Based on a three-level assessment mechanism of basic assessment, temperature rise assessment and voltage drop assessment, it analyzes whether there is a potential internal short circuit in the battery and avoids fire accidents during transportation. Compared with the traditional assessment method that is limited to static data such as battery SOC value, insulation resistance value and temperature, this invention adopts dynamic change data assessment, making the assessment of battery safety at the factory more accurate and effective.

[0083] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A smart and rapid safety testing and evaluation system for power batteries, comprising a testing and evaluation device, wherein the testing and evaluation device includes a battery communication module, and the battery communication module includes a battery communication cable, characterized in that... The intelligent rapid safety testing and evaluation system for power batteries is used for factory evaluation of power batteries. It is equipped with a three-level evaluation module to test and evaluate whether the power battery under test has the safety status for factory transportation. It also includes a human-machine interaction terminal. The testing and evaluation device is portable and includes a temperature acquisition module, a central processing unit, an energy storage power supply module, a wireless communication module, and a portable chassis. The battery communication module, the central processing unit, the energy storage power supply module, and the wireless communication module are all located in the portable chassis. The battery communication module, the temperature acquisition module, the energy storage power supply module, and the wireless communication module are connected to the central processing unit. One end of the battery communication cable extends out of the portable chassis. The central processing unit is connected to the human-machine interaction terminal and the enterprise manufacturing database through the wireless communication module. The three-level evaluation module includes a basic evaluation module, a temperature evaluation module, and a pressure evaluation module, all of which are located in the central processing unit. The basic evaluation module includes a basic value acquisition unit and a basic value analysis unit connected to the basic value acquisition unit. The basic value acquisition unit is connected to the battery communication cable to obtain the SOC value and insulation resistance value of the power battery under test. The basic value analysis unit determines whether the SOC value and insulation resistance value of the power battery under test are within the safe range of the power battery under the same coding value. The temperature assessment module includes a temperature acquisition unit and a temperature difference analysis unit connected to the temperature acquisition unit. The temperature acquisition unit is connected to the temperature acquisition module and the battery communication cable to obtain the ambient temperature and the battery temperature of the power battery under test. The temperature difference analysis unit determines whether the battery temperature is not higher than the ambient temperature. The pressure assessment module includes a battery voltage acquisition unit, a standard voltage acquisition unit, and a differential pressure analysis unit connected to the battery voltage acquisition unit and the standard voltage acquisition unit respectively. The battery voltage acquisition unit is connected to the battery communication cable to obtain the voltage of the power battery cell under test. The standard voltage acquisition unit connects to the enterprise manufacturing database through the wireless communication module to obtain the standard power battery cell voltage. The differential pressure analysis unit determines whether the voltage difference between the power battery cell under test and the standard power battery cell voltage is within the safe range.

2. The intelligent and rapid safety testing and evaluation system for power batteries according to claim 1, characterized in that, The temperature acquisition module is located on the outer surface of the portable chassis.

3. The intelligent and rapid safety testing and evaluation system for power batteries according to claim 1, characterized in that, The temperature assessment module also includes a battery temperature trend analysis unit to determine whether the battery temperature has an upward trend.

4. The intelligent and rapid safety testing and evaluation system for power batteries as described in claim 1, characterized in that, The differential pressure analysis unit determines whether the differential pressures between the highest voltage, lowest voltage, and average voltage of the tested power battery cell and the highest voltage, lowest voltage, and average voltage of the standard power battery cell are all within safe ranges.

5. A method for intelligent and rapid safety testing and evaluation of power batteries before they leave the factory, characterized in that, The intelligent rapid safety testing and evaluation system for power batteries as described in any one of claims 1-4 includes the following steps: Pre-test preparation steps: Power on the portable testing and evaluation device, connect it to the enterprise manufacturing database and human-machine interaction terminal, and connect the communication cable of the portable testing and evaluation device to the power battery to be tested. The detection and evaluation process involves sending a start command through the human-computer interaction terminal to activate the portable detection and evaluation device and begin detection and evaluation until the human-computer interaction terminal displays the detection data and evaluation conclusions. The testing and evaluation process ends when a termination command is sent via the human-machine interface terminal to disconnect the communication cable of the portable testing and evaluation device from the power battery under test, thus ending the testing. The testing and evaluation process includes a sequentially conducted primary basic evaluation stage, a secondary temperature rise evaluation stage, and a tertiary pressure difference evaluation stage. Each stage proceeds only after the previous stage is passed; if the previous stage fails, the evaluation result is returned as unqualified. In the first-level basic assessment stage, the code, SOC value and insulation resistance value of the power battery to be tested are obtained. It is analyzed whether the SOC value is less than the set safety threshold for the power battery under that code, and whether the insulation resistance value is greater than the set safety threshold for the power battery under that code. If it is false, the assessment is unqualified. If it is true, the next step of assessment is carried out. In the secondary temperature rise assessment stage, the highest internal temperature value and ambient temperature value of the power battery under test are obtained. The analysis is conducted to determine whether the highest internal temperature value of the power battery under test is close to the ambient temperature value and has no upward trend. It is determined whether the power battery has experienced an internal short circuit, which caused the temperature rise. If it is false, the assessment is unqualified. If it is true, the next step of the assessment is carried out. In the third-level differential pressure assessment stage, the voltage of the power battery cell to be tested is obtained, and the voltage of the power battery cell with the same code in the enterprise's manufacturing database is obtained. The voltage difference before and after the above voltage is calculated to see if it is less than the set safety threshold. It is determined whether the power battery has experienced an internal short circuit or a voltage drop caused by weak insulation. If it is false, the assessment is unqualified; if it is true, the final assessment is qualified.

6. The intelligent and rapid safety testing and evaluation method for power batteries according to claim 5, characterized in that, The three-stage differential pressure assessment phase also includes: Obtain the highest voltage, lowest voltage, and average voltage of the power battery cell to be inspected. Obtain the highest voltage, lowest voltage, and average voltage of the power battery test data cell with the same code from the enterprise's manufacturing database. Calculate whether the voltage difference before and after the above voltages is less than the set safety threshold.

7. The intelligent and rapid safety testing and evaluation method for power batteries according to claim 5, characterized in that, The portable testing and evaluation device can be connected to multiple power batteries under test at the same time to perform factory safety tests simultaneously.

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