A module battery deep over-discharge test system and method

Abstract

The present application relates to a module battery deep over-discharge test system and method, which relates to the field of battery detection technology, and solves the problem that the existing over-discharge test method can only perform over-discharge according to the voltage range set by the charging and discharging equipment itself, and its test range is relatively limited. The system includes: a charge and discharge controlled module, the two ends of which are respectively coupled to the lithium battery module and the charge and discharge management module to receive a charging control signal and control the energy feedback bidirectional power supply module in response to the charging control signal to perform a charging test on the lithium battery module, or receive a discharge control signal and control the energy feedback bidirectional power supply module in response to the discharge control signal to perform an over-discharge test on the lithium battery module. The present application has the following effects: by deeply discharging the battery, simulating the over-discharge operation of the battery in the actual use process, simulating the battery usage scenario to the greatest extent, and realizing the battery performance detection.

Description

Technical Field

[0001] The present application relates to the field of battery detection technology, and in particular to a module battery deep over-discharge test system and method. Background Art

[0002] At present, lithium batteries are widely used in the field of new energy vehicles. Batteries are one of the three core components of electric vehicles and are also the power source of electric vehicles. Therefore, safety testing of batteries is very important. The main safety tests include charging or over-discharging tests.

[0003] Regarding the over-discharge test, the over-discharge test is currently carried out as follows: a) the single battery or module is charged according to the charging method provided by the enterprise or the method specified in the corresponding test standard; b) the single battery or module is discharged at a current of 1I1(A) (I1=nominal capacity) for 90 minutes.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there are the following defects: the existing over-discharge test method can only perform over-discharge according to the voltage range set by the charging and discharging device itself, and the test range is relatively limited. Summary of the invention

[0005] In order to simulate the over-discharge operation of the battery in actual use by deeply discharging the battery, simulate the battery usage scenario to the greatest extent, and realize the performance detection of the battery, the present application provides a module battery deep over-discharge test system and method.

[0006] In the first aspect, the present application provides a module battery deep over-discharge test system, which adopts the following technical solution:

[0007] Lithium battery module, used for charging and over-discharging tests;

[0008] A charge and discharge management module, used for outputting a charge control signal or a discharge control signal;

[0009] An energy feedback bidirectional power module, one end of which is coupled to an external charging device to discharge to the external charging device so as to feed back excess power to the power grid or receive charging from the external charging device, and the other end of which is coupled to a lithium battery module to perform charging and over-discharging tests on the lithium battery module;

[0010] A charge and discharge controlled module, two ends of which are respectively coupled to the energy feedback bidirectional power supply module and the charge and discharge management module to receive a charge control signal and control the energy feedback bidirectional power supply module to perform a charge test on the lithium battery module in response to the charge control signal, or receive a discharge control signal and control the energy feedback bidirectional power supply module to perform an over-discharge test on the lithium battery module in response to the discharge control signal;

[0011] The power supply module is used to supply power to the charge and discharge management module and the charge and discharge controlled module.

[0012] By adopting the above technical solution, combined with the charge and discharge management module, the charge and discharge controlled module and the energy feedback bidirectional power supply module, the lithium battery module can be over-discharged as needed, thereby simulating the battery usage scenario to the greatest extent and realizing the battery performance test.

[0013] Optionally, the charge and discharge management module includes:

[0014] A main control module, used for outputting a main control signal;

[0015] The charging management module is coupled to the main control module to receive the main control signal and output the charging control signal to the charge and discharge controlled module; the discharging management module is coupled to the main control module to receive the main control signal and output the discharging control signal to the charge and discharge controlled module.

[0016] By adopting the above technical solution, the hardware architecture of the charge and discharge management module is specifically disclosed. The main control module can effectively and independently control the charging management module, thereby realizing the control over whether the charge and discharge controlled module is charged. In addition, the main control module can also effectively and independently control the discharge management module, thereby realizing the control over whether the charge and discharge controlled module is discharged.

[0017] Optionally, the charge and discharge controlled module includes:

[0018] A charging controlled module, coupled to the charging management module to receive a charging control signal and, in response to the charging control signal, to control the energy feedback bidirectional power supply module to perform a charging test on the lithium battery module;

[0019] The discharge controlled module is coupled to the discharge management module to receive a discharge control signal and controls the energy feedback bidirectional power supply module to perform an over-discharge test on the lithium battery module in response to the discharge control signal.

[0020] By adopting the above technical scheme, the hardware structure of the charge and discharge controlled module is specifically disclosed. The setting of the charge controlled module facilitates the separate control of the charging test of the lithium battery module by the charging management module through the energy feedback bidirectional power supply module. Similarly, the discharge controlled module facilitates the separate control of the discharge test of the lithium battery module by the discharge management module through the energy feedback bidirectional power supply module.

[0021] Optionally, a module battery deep over-discharge test system further includes:

[0022] A first pre-charging module, controlled by the main control module and coupled to the charging management module to charge the charging management module and keep the voltage difference between the front and rear ends of the charging management module less than a preset voltage;

[0023] A first voltage detection module, used to detect the voltage difference between the front and rear ends of the charging management module;

[0024] When the main control module outputs a main control signal for controlling the charging management module, the charging management module and the discharging management module are disconnected, and the first voltage detection module is started to detect the voltage difference between the front and rear ends of the charging management module;

[0025] If the voltage difference between the front and rear ends of the charging management module detected by the first voltage detection module exceeds the first preset voltage difference, the first pre-charging module receives the main control signal and responds to the main control signal to charge the charging management module, keeping the voltage difference between the front and rear ends of the charging management module less than the preset voltage difference.

[0026] By adopting the above technical solution, full consideration is given to the fact that when the lithium battery module is to be charged and tested, when it is switched to the charging state, the existence of peak elimination in this process needs to be considered. At this time, the timing of peak elimination can be effectively determined by setting the first pre-charging module and the first voltage detection module, thereby avoiding the influence of peak elimination caused by the battery charging switching process.

[0027] Optionally, a module battery deep over-discharge test system further includes:

[0028] A second pre-charging module, controlled by the main control module and coupled to the discharge management module to charge the discharge management module and keep the voltage difference between the front and rear ends of the discharge management module less than a preset voltage;

[0029] A second voltage detection module, used to detect the voltage at the front and rear ends of the discharge management module;

[0030] When the main control module outputs a main control signal for controlling the discharge management module, the charge management module and the discharge management module are disconnected, and the second voltage detection module is started to detect the voltage difference between the front and rear ends of the discharge management module;

[0031] If the preset undervoltage protection voltage of the discharge management module is greater than or equal to the second preset voltage, the second voltage detection module is started to detect the voltage difference between the front and rear ends of the discharge management module;

[0032] If the voltage difference between the front and rear ends of the discharge management module detected by the second voltage detection module exceeds the first preset voltage difference, the second pre-charging module receives the main control signal and responds to the main control signal to charge the discharge management module, so as to keep the voltage difference between the front and rear ends of the discharge management module less than the first preset voltage difference;

[0033] If the preset undervoltage protection voltage of the discharge management module is lower than the second preset voltage, the discharge management module is started first, and then the second voltage detection module is started to detect the voltage difference between the front and rear ends of the discharge management module;

[0034] If the voltage difference between the front and rear ends of the discharge management module detected by the second voltage detection module exceeds the first preset voltage difference, the second pre-charging module receives the main control signal and responds to the main control signal to charge the discharge management module to keep the voltage difference between the front and rear ends of the discharge management module less than the first preset voltage difference.

[0035] By adopting the above technical solution, full consideration is given to the fact that when a lithium battery module is to be discharged and switched to a discharge state, the existence of peak elimination in this process needs to be considered. At this time, the timing of peak elimination can be effectively determined by setting the second pre-charging module and the second voltage detection module, thereby avoiding the influence of peak elimination caused by the battery discharge switching process.

[0036] Optionally, a module battery deep over-discharge test system further includes:

[0037] A battery health monitoring device is used to monitor the health of the lithium battery module;

[0038] Notification module, used to send notification information to the terminal held by the person in charge;

[0039] Processing terminal, used for data analysis and processing;

[0040] If and only if the health of the lithium battery module is lower than the preset health, the processing terminal starts the notification module to send a notification message to the terminal held by the person in charge.

[0041] By adopting the above technical solution, it is possible to effectively determine whether the lithium battery module is affected by over-discharge during the charge and discharge test, resulting in a situation where the battery health is lower than expected, and the relevant person in charge will be notified in a timely manner when this situation occurs.

[0042] Optionally, a module battery deep over-discharge test system further includes:

[0043] The recording and analysis module is used to record the health of the lithium battery module detected by the battery health monitoring device before and after the test, and analyze and obtain the health difference;

[0044] If the health difference of the battery exceeds the preset percentage and is not within the preset difference range, the processing terminal starts the notification module to send a notification message to the terminal held by the person in charge.

[0045] By adopting the above technical solution, it is further considered that the health of the tested lithium battery module will be affected and changed before and after the test during the over-discharge process. Once the degree of change in health before and after exceeds expectations, the person in charge will be notified in time.

[0046] Optionally, a module battery deep over-discharge test system is characterized by further comprising:

[0047] The first database stores the distribution probability of the fault category corresponding to the battery health being lower than the preset health, and defines the fault category as module battery deep over-discharge test system fault and battery fault;

[0048] If and only if the health of the lithium battery module is lower than the preset health, the processing terminal analyzes the health difference of the battery exceeding the preset percentage;

[0049] If the health difference of the batteries exceeding the preset percentage exceeds the first preset difference, the processing terminal analyzes and determines that the fault type is a fault in the module battery deep over-discharge test system;

[0050] If the health difference of the battery exceeding the preset proportion is lower than the first preset difference and exceeds the second preset difference, the processing terminal retrieves the first database to obtain the fault distribution category distribution probability corresponding to the battery health being lower than the preset health, as the current fault category distribution probability determined by the analysis, and defines that the first preset difference is greater than the second preset difference;

[0051] If the health difference of the batteries exceeding the preset percentage is lower than the second preset difference, the processing terminal analyzes and determines that the fault type is a battery fault;

[0052] The processing terminal loads the fault category into the notification information sent to the terminal held by the person in charge.

[0053] By adopting the above technical solution, when the health difference of the batteries exceeding the preset proportion exceeds the first preset difference, the specific type of fault will be determined by comprehensive analysis based on the health difference of the batteries exceeding the preset proportion and the first database, so as to facilitate the person in charge to better understand the real problem.

[0054] Optionally, a module battery deep over-discharge test system further includes:

[0055] The second database stores the specific problem probability distribution of module battery deep over-discharge test system failures;

[0056] The third database stores the number of times and success rates of different persons in charge handling different specific problems of deep over-discharge test system failures of different modules of batteries;

[0057] If the fault category identified by the processing terminal analysis includes a module battery deep over-discharge test system fault, the specific problem probability distribution of the module battery deep over-discharge test system fault is queried from the second database, and the number of times and success rates of processing of different specific problems of different module battery deep over-discharge test system faults by different persons in charge are queried from the third database;

[0058] The processing terminal multiplies and adds the processing success rate of each person in charge with the distribution probability of the corresponding specific problem one by one, and obtains the total as the processing success rate of the person in charge, and selects the person in charge with the highest processing success rate as the object to be notified by the notification module.

[0059] By adopting the above technical solution, when the fault category analyzed and identified by the processing terminal includes a module battery deep over-discharge test system fault, it is convenient for the processing terminal to determine the person in charge with the highest processing success rate based on the analysis of the second database and the third database, thereby improving the overall problem processing probability.

[0060] In the second aspect, the present application provides a module battery deep over-discharge test method, which adopts the following technical solution:

[0061] A module battery deep over-discharge test method, comprising:

[0062] Output charging control signal or discharging control signal;

[0063] Receiving a charging control signal and controlling the energy feedback bidirectional power supply module to perform a charging test on the lithium battery module in response to the charging control signal;

[0064] The discharge control signal is received and the energy feedback bidirectional power supply module is controlled in response to the discharge control signal to perform an over-discharge test on the lithium battery module.

[0065] By adopting the above technical solution, the lithium battery module can be over-discharged through the energy feedback bidirectional power supply module through the charging control signal or the discharging control signal as needed, thereby simulating the battery usage scenario to the greatest extent and realizing the battery performance test.

[0066] In summary, the beneficial technical effects of this application are:

[0067] 1. Using energy feedback bidirectional power supply as negative power supply can achieve high efficiency and energy saving and deep discharge.

[0068] 2. The new PID regulation is adopted and the pre-charge logic is added to further eliminate the peak elimination generated during the battery charge and discharge switching process.

[0069] 3. Realize high-rate over-discharge test experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 This is a system framework of a module battery deep over-discharge test system in Example 1 of the present application. Figure 1 .

[0071] Figure 2 It is a schematic diagram of the energy feedback bidirectional power supply module testing the charging and discharging of the lithium battery module in Example 1 of the present application.

[0072] Figure 3 This is a system framework of a module battery deep over-discharge test system in Example 1 of the present application. Figure 2 .

[0073] Figure 4 This is a system block diagram of a module battery deep over-discharge test system according to Example 2 of the present application.

[0074] Figure 5 This is a system block diagram of a module battery deep over-discharge test system according to Example 3 of the present application.

[0075] Figure 6 It is a flow chart of a module battery deep over-discharge test method according to an embodiment of the present application.

[0076] In the figure, 1. lithium battery module; 2. charge and discharge management module; 3. charge and discharge controlled module; 4. power supply module; 5. main control module; 6. charge management module; 7. discharge management module; 8. charge controlled module; 9. discharge controlled module; 10. first pre-charge module; 11. first voltage detection module; 12. second pre-charge module; 13. second voltage detection module; 14. battery health monitoring device; 15. notification module; 16. processing terminal; 17. record analysis module; 18. first database; 19. second database; 20. third database; 21. fourth database; 22. energy feedback bidirectional power supply module. DETAILED DESCRIPTION

[0077] The present application is further described in detail below in conjunction with the accompanying drawings.

[0078] Example 1

[0079] Reference Figure 1 , is a module battery deep over-discharge test system disclosed in the present application, which includes a lithium battery module 1, an energy feedback bidirectional power supply module 22, a charge and discharge management module 2, a charge and discharge controlled module 3, and a power supply module 4, wherein the power supply module 4 is used to supply power to the charge and discharge management module 2 and the charge and discharge controlled module 3; the lithium battery module 1 is used to perform charging and over-discharge tests, and the lithium battery module 1 is defined as a battery module that can be understood as an intermediate product of a battery cell and a pack formed by combining lithium-ion batteries in series and parallel, and adding a single battery monitoring and management device.

[0080] The charge and discharge management module 2 is used to output a charge control signal or a discharge control signal. Both ends of the charge and discharge controlled module 3 are respectively coupled to the energy feedback bidirectional power supply module 22 and the charge and discharge management module 2 to receive the charge control signal or the discharge control signal. The charge and discharge management module 2 can preferably be a relay.

[0081] Reference Figure 1 , Figure 2 The energy feedback bidirectional power module 22 has one end coupled to an external charging device to discharge to the external charging device so as to feed back excess power to the power grid or receive charging from the external charging device, and the other end coupled to the lithium battery module 1 to perform charging and over-discharging tests on the lithium battery module 1.

[0082] When the charge-discharge controlled module 3 receives a charge control signal, the energy feedback bidirectional power supply module 22 is controlled in response to the charge control signal to perform a charge test on the lithium battery module 1; when the charge-discharge controlled module 3 receives a discharge control signal, the energy feedback bidirectional power supply module 22 is controlled in response to the discharge control signal to perform an over-discharge test on the lithium battery module 1, wherein the charge-discharge controlled module 3 can be preferably a contactor, which is divided into an AC contactor (voltage AC) and a DC contactor (voltage DC), and is used in power, power distribution and power consumption. In a broad sense, a contactor refers to an electrical appliance in industrial electricity that uses a coil to flow current to generate a magnetic field to close the contacts to control the load.

[0083] Reference Figure 3 Considering that when the charge and discharge management module 2 outputs a charge control signal or a discharge control signal, the charge and discharge controlled module 3 can better respond to the charge control signal or the discharge control signal, the charge and discharge management module 2 includes a main control module 5, a charge management module 6, and a discharge management module 7; the charge and discharge controlled module 3 includes a charge controlled module 8 and a discharge controlled module 9, wherein the main control module 5 can preferably be a host computer.

[0084] When the main control module 5 outputs a main control signal for controlling the charging management module 6, the charging management module 6 is coupled to the main control module 5 to receive the main control signal and output a charging control signal to the charging controlled module 8. The charging controlled module 8 is coupled to the charging management module 6 to receive the charging control signal and responds to the charging control signal to perform a charging test on the lithium battery module 1 through the energy feedback bidirectional power supply module 22.

[0085] When the main control module 5 outputs a main control signal for controlling the discharge management module 7, the discharge management module 7 is coupled to the main control module 5 to receive the main control signal and output a discharge control signal to the discharge controlled module 9. The discharge controlled module 9 is coupled to the discharge management module 7 to receive the discharge control signal and control the energy feedback bidirectional power supply module 22 in response to the discharge control signal to perform an over-discharge test on the lithium battery module 1.

[0086] Example 2

[0087] Reference Figure 4This embodiment is different from the first embodiment in that a module battery deep over-discharge test system further includes a first pre-charging module 10 , a first voltage detection module 11 , a second pre-charging module 12 , and a second voltage detection module 13 .

[0088] When the main control module 5 outputs a main control signal for controlling the charging management module 6, the charging management module 6 and the discharging management module 7 are disconnected, and a first voltage detection module 11 whose two ends are connected to the front and rear ends of the charging management module 6 for detecting the voltage difference between the front and rear ends of the charging management module 6 is started.

[0089] If the voltage difference between the front and rear ends of the charging management module 6 detected by the first voltage detection module 11 exceeds a first preset voltage difference, the first pre-charging module 10 controlled by the main control module 5 and coupled to the charging management module 6 to charge the charging management module 6 receives the main control signal and responds to the main control signal to charge the charging management module 6, thereby keeping the voltage difference between the front and rear ends of the charging management module 6 less than the preset voltage difference.

[0090] When the main control module 5 outputs a main control signal for controlling the discharge management module 7 , the charge management module 6 and the discharge management module 7 are disconnected, and the second voltage detection module 13 for detecting the voltage difference between the front and rear ends of the discharge management module 7 is started.

[0091] If the preset undervoltage protection voltage of the discharge management module 7 is greater than or equal to the second preset voltage, the second voltage detection module 13 is started to detect the voltage difference between the front and rear ends of the discharge management module 7 .

[0092] If the voltage difference between the front and rear ends of the discharge management module 7 detected by the second voltage detection module 13 exceeds the first preset voltage difference, the second pre-charging module 12 receives the main control signal and responds to the main control signal to charge the discharge management module 7, keeping the voltage difference between the front and rear ends of the discharge management module 7 less than the first preset voltage difference.

[0093] If the preset undervoltage protection voltage of the discharge management module 7 is lower than the second preset voltage, the discharge management module 7 is started first, and then the second voltage detection module 13 is started to detect the voltage difference between the front and rear ends of the discharge management module 7 .

[0094] If the voltage difference between the front and rear ends of the discharge management module 7 detected by the second voltage detection module 13 exceeds the first preset voltage difference, the second pre-charging module 12 receives the main control signal and responds to the main control signal to charge the discharge management module 7, keeping the voltage difference between the front and rear ends of the discharge management module 7 less than the first preset voltage difference, where the first preset voltage difference is 5V, and can also be other voltages.

[0095] Example 3

[0096] Reference Figure 5, this embodiment is different from Embodiment 2 in that the module battery deep over-discharge test system also includes a battery health monitoring device 14 for monitoring and obtaining the health of the lithium battery module 1, a notification module 15 for sending notification information to a terminal held by a person in charge, a processing terminal 16 for data analysis and processing, a record analysis module 17 for recording the health of the lithium battery module 1 detected by the battery health monitoring device 14 before and after the test, and analyzing and obtaining the health difference, a first database 18 storing the distribution probability of the fault category corresponding to the battery health lower than the preset health, a second database 19 storing the probability distribution of specific problems of the module battery deep over-discharge test system fault, and a third database 20 storing the number of times and the success rate of processing of different specific problems of different module battery deep over-discharge test system faults by different persons in charge.

[0097] If the health difference of the battery exceeding the preset percentage is not within the preset difference range or the health of the lithium battery module 1 is lower than the preset health, the processing terminal 16 activates the notification module 15 to send a notification message to the terminal held by the person in charge.

[0098] Among them, the health of the battery can be calculated based on the relationship between SOH and battery internal resistance to obtain SOH, that is, Among them, R eol is the internal resistance of the battery at the end of its life, R now is the internal resistance of the battery when it leaves the factory, R new is the internal resistance of the battery in its current state; therefore, the health of the battery can be analyzed and obtained by monitoring the internal resistance.

[0099] In addition, the processing terminal 16 starts the notification module 15 to send the notification information to the terminal held by the person in charge, including the specific analysis and judgment of the fault. The specific analysis and judgment process is as follows:

[0100] If and only if the health of the lithium battery module 1 is lower than the preset health, the processing terminal 16 analyzes the health difference of the batteries exceeding the preset percentage.

[0101] If the health difference of the batteries exceeding the preset percentage exceeds the first preset difference, the processing terminal 16 analyzes and determines that the fault type is a fault in the module battery deep over-discharge test system, where the first preset difference can be 0.2 health.

[0102] If the health difference of the batteries exceeding the preset percentage is lower than the first preset difference and exceeds the second preset difference, the processing terminal 16 calls the first database 18 to obtain the fault distribution category distribution probability corresponding to the battery health being lower than the preset health, as the fault category distribution probability determined by the analysis, and defines the first preset difference to be greater than the second preset difference, and the second preset difference can be 0.1 health.

[0103] If the health difference of the batteries exceeding the preset percentage is lower than a second preset difference, the processing terminal 16 analyzes and determines that the fault type is a battery fault, wherein the processing terminal 16 may be a central processor or other terminal devices.

[0104] The processing terminal 16 includes the failure type in the notification information sent to the terminal held by the person in charge.

[0105] In addition, it is further considered that the recipient of the notification information sent by the notification module 15 needs to be the person who is most suitable to handle the fault problem. The specific method of confirming the person in charge is as follows:

[0106] If the processing terminal 16 analyzes and identifies a module battery deep over-discharge test system failure as a fault in the fault category, the specific problem probability distribution of the module battery deep over-discharge test system failure is obtained from the second database 19, and the number of times and success rates of processing different specific problems of different module battery deep over-discharge test system failures by different persons in charge are obtained from the third database 20.

[0107] The processing terminal 16 adds the processing success rate of each person in charge for the specific problem and the distribution probability of the corresponding specific problem one by one, and obtains the total as the processing success rate of the person in charge, and selects the person in charge with the highest processing success rate as the object to be notified by the notification module 15.

[0108] For example, assuming there are three specific problems, namely A, B, and C. The distribution probability of A is 30%, the distribution probability of B is 40%, and the distribution probability of C is 30%. The person in charge is A. The probability of A's successful processing of A is 80%, the probability of A's successful processing of B is 90%, and the probability of A's successful processing of C is 70%. Then A's overall processing success rate is 81%.

[0109] In addition, it is further considered that the object of the notification information sent by the notification module 15 is the person who is most suitable to handle the current fault problem. It is also necessary to consider that the subsequent person in charge may not be good at some problems and need to start learning again after arriving at the scene. So how to facilitate the corresponding person in charge to learn how to deal with related problems faster? The specific method is as follows: The processing terminal 16 obtains the number of times and the success rate of the person in charge's handling of different specific problems of the deep over-discharge test system failure of different modules of the battery according to the person in charge determined by the analysis.

[0110] If the number of times the person in charge has handled some problems is lower than the preset number, the processing terminal 16 takes the specific problems with a high success rate in handling by the person in charge and the problems with a processing number lower than the preset number as common query objects, queries and obtains the processing learning videos of the problems with a processing number lower than the preset number from the fourth database 21, and analyzes and determines the unique processing learning videos as the key reminder content based on the intersection learning part of the specific problems with a high success rate in handling by the person in charge and the problems with a processing number lower than the preset number, and uses the intersection learning part as other reminder content, wherein the preset number can be 1 or 2 times, which can be set according to needs.

[0111] The processing terminal 16 sends the key reminder content and other reminder content to the terminal held by the person in charge. The terminal held by the person in charge can be a mobile phone, a computer or other terminal devices.

[0112] The present application also provides a method for testing deep over-discharge of a module battery, including:

[0113] Step S100: outputting a charging control signal or a discharging control signal.

[0114] Step S200 , receiving a charging control signal and controlling the energy feedback bidirectional power supply module 22 to perform a charging test on the lithium battery module 1 in response to the charging control signal.

[0115] Step S300 , receiving a discharge control signal and controlling the energy feedback bidirectional power supply module 22 to perform an over-discharge test on the lithium battery module 1 in response to the discharge control signal.

[0116] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A module battery deep over-discharge test system, characterized in that: include: A lithium battery module (1) for testing charging and over-discharging; A charge and discharge management module (2), used for outputting a charge control signal or a discharge control signal; An energy feedback bidirectional power supply module (22), one end of which is coupled to an external charging device to discharge to the external charging device so as to feed back excess power to the power grid or receive charging from the external charging device, and the other end of which is coupled to a lithium battery module (1) to perform charging and over-discharging tests on the lithium battery module (1); A charge and discharge controlled module (3), two ends of which are respectively coupled to an energy feedback bidirectional power supply module (22) and a charge and discharge management module (2) to receive a charge control signal and control the energy feedback bidirectional power supply module (22) to perform a charge test on the lithium battery module (1) in response to the charge control signal, or receive a discharge control signal and control the energy feedback bidirectional power supply module (22) to perform an over-discharge test on the lithium battery module (1) in response to the discharge control signal; A power supply module (4) is used to supply power to the charge and discharge management module (2) and the charge and discharge controlled module (3); Also includes: A battery health monitoring device (14) for monitoring and obtaining the health of the lithium battery module (1); Notification module (15), used to send notification information to the terminal held by the person in charge; A processing terminal (16) for data analysis and processing; When and only when the health of the lithium battery module (1) is lower than a preset health, the processing terminal (16) activates the notification module (15) to send notification information to the terminal held by the person in charge; Also includes: A recording and analysis module (17) is used to record the health of the lithium battery module (1) detected and obtained by the battery health monitoring device (14) before and after the test, and to analyze and obtain the health difference; If the health difference of the battery that exceeds the preset percentage is not within the preset difference range, the processing terminal (16) starts the notification module (15) to send a notification message to the terminal held by the person in charge; Also includes: A first database (18) stores a distribution probability of a fault category corresponding to a battery health level lower than a preset health level, and defines the fault category as a module battery deep over-discharge test system fault and a battery fault; When and only when the health of the lithium battery module (1) is lower than a preset health, the processing terminal (16) analyzes the health difference of the batteries exceeding a preset percentage; If the health difference of the batteries exceeding the preset percentage exceeds a first preset difference, the processing terminal (16) analyzes and determines that the fault type is a fault in the module battery deep over-discharge test system; If the health difference of the battery exceeding the preset percentage is lower than the first preset difference and exceeds the second preset difference, the processing terminal (16) retrieves the first database (18) to obtain the fault distribution category distribution probability corresponding to the battery health being lower than the preset health, as the current fault category distribution probability determined by the analysis, and defines that the first preset difference is greater than the second preset difference; If the health difference of the batteries exceeding the preset percentage is lower than a second preset difference, the processing terminal (16) analyzes and determines that the fault type is a battery fault; The processing terminal (16) loads the fault category into the notification information sent to the terminal held by the person in charge; Also includes: A second database (19) stores a specific probability distribution of module battery deep over-discharge test system failures; A third database (20) stores the number of times different persons in charge have handled different specific problems of deep over-discharge test system failures of different modules of batteries and the success rate of the handling; If the fault category identified by the processing terminal (16) through analysis includes a module battery deep over-discharge test system fault, the specific problem probability distribution of the module battery deep over-discharge test system fault is obtained from the second database (19), and the number of times and success rates of processing different specific problems of different module battery deep over-discharge test system faults by different persons in charge are obtained from the third database (20); The processing terminal (16) multiplies and adds the processing success rate of each person in charge with the distribution probability of the corresponding specific problem one by one, obtains the sum as the processing success rate of the person in charge, and selects the person in charge with the highest processing success rate as the object to be notified by the notification module (15); If the number of times the responsible person has handled some of the problems is lower than the preset number, the processing terminal (16) uses the specific problems that the responsible person has a high success rate in handling and the problems that have been handled less than the preset number of times as common query objects, queries from the fourth database (21) to obtain the processing learning videos of the problems that have been handled less than the preset number of times, and analyzes and determines the unique processing learning videos as the key reminder content based on the intersection learning part of the specific problems that the responsible person has a high success rate in handling and the problems that have been handled less than the preset number of times, and uses the intersection learning part as other reminder content.

2. A module battery deep over-discharge test system according to claim 1, characterized in that: The charge and discharge management module (2) comprises: A main control module (5), used for outputting a main control signal; A charging management module (6) coupled to the main control module (5) to receive a main control signal and output a charging control signal to the charging and discharging controlled module (3); The discharge management module (7) is coupled to the main control module (5) to receive the main control signal and output the discharge control signal to the charge and discharge controlled module (3).

3. A module battery deep over-discharge test system according to claim 2, characterized in that: The charge and discharge controlled module (3) comprises: A charging controlled module (8) coupled to the charging management module (6) to receive a charging control signal and, in response to the charging control signal, to control the energy feedback bidirectional power supply module (22) to perform a charging test on the lithium battery module (1); The discharge controlled module (9) is coupled to the discharge management module (7) to receive a discharge control signal and, in response to the discharge control signal, controls the energy feedback bidirectional power supply module (22) to perform an over-discharge test on the lithium battery module (1).

4. A module battery deep over-discharge test system according to claim 2 or 3, characterized in that: Also includes: A first pre-charging module (10) is controlled by the main control module (5) and coupled to the charging management module (6) to charge the charging management module (6) and keep the voltage difference between the front and rear ends of the charging management module (6) smaller than a preset voltage; A first voltage detection module (11) is used to detect a voltage difference between the front and rear ends of the charging management module (6); When the main control module (5) outputs a main control signal for controlling the charging management module (6), the charging management module (6) and the discharging management module (7) are disconnected, and the first voltage detection module (11) is started to detect the voltage difference between the front and rear ends of the charging management module (6); If the voltage difference between the front and rear ends of the charging management module (6) detected by the first voltage detection module (11) exceeds a first preset voltage difference, the first pre-charging module (10) receives a main control signal and responds to the main control signal to charge the charging management module (6), thereby maintaining the voltage difference between the front and rear ends of the charging management module (6) less than the preset voltage difference.

5. A module battery deep over-discharge test system according to claim 2 or 3, characterized in that: Also includes: A second pre-charging module (12) is controlled by the main control module (5) and coupled to the discharge management module (7) to charge the discharge management module (7) and keep the voltage difference between the front and rear ends of the discharge management module (7) smaller than a preset voltage; A second voltage detection module (13) is used to detect voltages at the front and rear ends of the discharge management module (7); When the main control module (5) outputs a main control signal for controlling the discharge management module (7), the charge management module (6) and the discharge management module (7) are disconnected, and the second voltage detection module (13) is started to detect the voltage difference between the front and rear ends of the discharge management module (7); If the preset undervoltage protection voltage of the discharge management module (7) is greater than or equal to the second preset voltage, the second voltage detection module (13) is started to detect the voltage difference between the front and rear ends of the discharge management module (7); If the voltage difference between the front and rear ends of the discharge management module (7) detected by the second voltage detection module (13) exceeds a first preset voltage difference, the second pre-charging module (12) receives a main control signal and responds to the main control signal to charge the discharge management module (7), thereby maintaining the voltage difference between the front and rear ends of the discharge management module (7) less than the first preset voltage difference; If the preset undervoltage protection voltage of the discharge management module (7) is lower than the second preset voltage, the discharge management module (7) is first started, and then the second voltage detection module (13) is started to detect the voltage difference between the front and rear ends of the discharge management module (7); If the voltage difference between the front and rear ends of the discharge management module (7) detected by the second voltage detection module (13) exceeds a first preset voltage difference, the second pre-charging module (12) receives a main control signal and charges the discharge management module (7) in response to the main control signal, thereby maintaining the voltage difference between the front and rear ends of the discharge management module (7) less than the first preset voltage difference.

6. A module battery deep over-discharge test method, characterized in that: A system as claimed in any one of claims 1 to 5, comprising: Output charging control signal or discharging control signal; Receiving a charging control signal and controlling the energy feedback bidirectional power supply module (22) in response to the charging control signal to perform a charging test on the lithium battery module (1); A discharge control signal is received and, in response to the discharge control signal, an energy feedback bidirectional power supply module (22) is controlled to perform an over-discharge test on the lithium battery module (1).

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