Battery pack circuit breaking unit life test method, device and battery pack

Abstract

The application relates to the battery technical field and discloses a battery pack circuit breaker unit life test method, a device and a battery pack. The battery pack circuit breaker unit belongs to the battery pack. The test method comprises the following steps: informing the battery pack and a load simulation circuit; the load simulation circuit performs charging and discharging once, wherein when the load simulation circuit performs charging, current flows from the battery pack to the load simulation circuit and is accumulated in the load simulation circuit; when the load simulation circuit performs discharging, electric energy is consumed in the load simulation circuit; the informing action is cyclically performed; and the life of the battery pack circuit breaker unit is determined according to the cycle number. The application measures the life of the battery pack circuit breaker unit, has high test efficiency, high reliability and accurate test results.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular, relates to a battery pack circuit breaking unit life test method, device and battery pack. BACKGROUND

[0002] The core of electric vehicle technology is the "three-electricity" system, namely the electric drive system, the battery system and the electric control system, which constitutes the key technology of electric vehicles. The electric drive system is generally composed of an electric motor, a transmission mechanism and a converter. It is generally regarded as the load of the electric vehicle. The battery system, also known as the battery pack, is the core of the "three-electricity", which is used to power the electric drive system and is the most complex system with the highest cost in the "three-electricity". The electric control system is the general control console of the electric vehicle, which is called the brain of new energy vehicles.

[0003] The battery pack circuit breaking unit (BDU) in the battery system is a key connecting component between the battery system and the electric drive system, which is responsible for the on-off of the current between the battery system and the electric drive system. Its life directly affects the number of times the electric vehicle can start or stop. Therefore, it is particularly important to design and develop a method and device for testing the life of the battery pack circuit breaking unit. SUMMARY

[0004] The present application provides a method for testing the life of the battery pack circuit breaking unit, which can measure the life of all components in the battery pack circuit breaking unit.

[0005] In one aspect, the present application provides a method for testing the life of the battery pack circuit breaking unit, which belongs to the battery pack. The method comprises: notifying the battery pack and the load simulation circuit, and the load simulation circuit performs charging and discharging, wherein when the load simulation circuit performs charging, the current flows from the battery pack to the load simulation circuit and accumulates in the load simulation circuit; when the load simulation circuit performs discharging, the electric energy is consumed in the load simulation circuit; the notification action is cyclically executed; and the life of the battery pack circuit breaking unit is determined according to the number of cycles.

[0006] Because the battery pack circuit breaking unit generally includes multiple components such as resistors and relays, the present test method can test the life of all components in the battery pack circuit breaking unit at one time. The test efficiency is higher, and it is more consistent with the actual working condition of the electric vehicle.

[0007] In some implementations, notifying the battery pack and the load simulation circuit, and the load simulation circuit performing the one-time charging includes: sending a high-voltage-up signal to the battery pack to make the battery pack circuit breaker unit perform a high-voltage-up action; and sending a charging signal to the load simulation circuit to make the load simulation circuit absorb the battery pack electric energy. When the battery pack circuit breaker unit and the load simulation circuit perform the charging, the high-voltage-up signal is sent to the battery pack at the same time as the charging signal is sent to the load simulation circuit. In this way, the process of the battery pack charging the load can be restored, and the use scenario of the electric vehicle starting in reality can be better met.

[0008] In some implementations, notifying the battery pack and the load simulation circuit, and the load simulation circuit performing the one-time discharging includes: sending a high-voltage-down signal to the battery pack to make the battery pack circuit breaker unit perform a high-voltage-down action; and sending a discharging signal to the load simulation circuit to make the load simulation circuit release the absorbed electric energy.

[0009] When the battery pack circuit breaker unit and the load simulation circuit perform the discharging, the high-voltage-down signal is sent to the battery pack at the same time as the discharging signal is sent to the load simulation circuit. In this way, the process of the load discharging can be restored, and the scenario of the electric vehicle shutting down during driving can be better met.

[0010] In some implementations, notifying the battery pack and the load simulation circuit, and the load simulation circuit performing the one-time discharging includes: waiting for a first time period after the notification of the one-time charging action is performed; or when the voltage of the load simulation circuit reaches a voltage threshold, notifying the battery pack and the load simulation circuit, and the load simulation circuit performing the one-time discharging.

[0011] The battery pack high-voltage-down needs the high-voltage-up action to end. Therefore, by waiting for the first time period or the voltage of the load simulation circuit reaching the voltage threshold, it is indicated that the battery pack high-voltage-up action is completed, the battery pack circuit breaker unit high-voltage-down and high-voltage-up are closely connected, and the test time is shortened.

[0012] In some implementations, the notification action is cyclically performed, including: after the notification of the one-time discharging action is performed, waiting for a second time period, and then performing the cyclic action. The battery pack performs the next cycle by waiting for the second time period, during which the battery pack completes the high-voltage-down action. This method realizes the close connection of the two cycles, and shortens the test time.

[0013] In some implementations, the cycle is stopped when the number of times of cyclically performing the notification action reaches a life threshold. Because the number of times of cyclically performing the notification action reaches the life threshold, the battery pack circuit breaker unit life test is stopped in time, the test time is saved, and the test efficiency is improved.

[0014] In some implementations, the cycle is stopped when the battery pack fails. This makes the test result more reliable and avoids continuing the invalid test.

[0015] In some implementations, the notification from the battery pack is received, and the battery pack is determined to be malfunctioning based on the notification. This way, the specific situation of the malfunction can be known by parsing the notification, and corresponding actions can be facilitated based on different situations of the malfunction.

[0016] In some implementations, when the battery pack is malfunctioning, the load simulation circuit is notified to be disconnected. Because the electrochemical reaction in the battery pack can be dangerous, the load simulation circuit is protected by being notified to be disconnected in time, so as to avoid being impacted by the malfunction of the battery pack. In addition, the safety of the tester is also protected by being notified to be disconnected in time, so as to avoid personal injury to the tester.

[0017] In some implementations, the high-voltage-up action includes: turning on the battery pack circuit breaking unit, so that the current of the battery pack can flow to the load simulation circuit through the battery pack circuit breaking unit and be accumulated in the load simulation circuit. Because the high-voltage-up turns on the battery pack and the load simulation circuit, the load simulation circuit can absorb the power of the battery pack to simulate the real use scenario of the battery pack.

[0018] In some implementations, the high-voltage-down action includes: disconnecting the battery pack circuit breaking unit, so that the current of the battery pack cannot flow to the load simulation circuit. Because the high-voltage-down disconnects the battery pack and the load simulation circuit, the load simulation circuit can release the absorbed power through the simulation load, so as to normally absorb the power of the battery pack when turned on in the next cycle.

[0019] In some implementations, the notification adopts a message of a controller area network bus protocol or a local interconnect network bus protocol.

[0020] In a second aspect, the present application provides a test device for the method of determining the service life of the battery pack circuit breaking unit, which belongs to the battery pack. The test device includes: a notification unit for notifying the battery pack and the load simulation circuit, and the load simulation circuit performs charging and discharging once; a central processing unit for controlling the notification unit to perform the notification action cyclically; and a counter for counting the number of cycles; wherein the central processing unit is further configured to determine the service life of the battery pack circuit breaking unit based on the number of cycles.

[0021] According to some embodiments, the test device further includes a receiving unit and the like for implementing the various embodiments of the first aspect.

[0022] In a third aspect, the present application provides a test method for the method of determining the service life of the battery pack circuit breaking unit, which belongs to the battery pack. The method includes:

[0023] The receiving load simulation circuit executes a charging and discharging notification, wherein, when the load simulation circuit is charged, the current flows to the load simulation circuit through the battery pack circuit breaker unit; when the load simulation circuit is discharged, the electric energy is consumed in the load simulation circuit. According to the charging and discharging notification, the battery pack circuit breaker unit is controlled to be turned on and turned off respectively, so that when the load simulation circuit performs charging, the current flows from the battery pack to the load simulation circuit and accumulates in the load simulation circuit; when the load simulation circuit performs discharging, the electric energy is consumed in the load simulation circuit; the charging and discharging is executed once; and according to the notification of cyclically executing charging and discharging, the battery pack circuit breaker unit is cyclically controlled to be turned on and turned off to execute the charging and discharging action. The test method corresponds to the method of the first aspect, and when the execution subject is the battery pack, the load simulation circuit receives the notification of executing charging and discharging once from the test device. And according to this, the corresponding action of turning on and turning off the battery pack circuit breaker unit is executed.

[0024] In a fourth aspect, the application provides a battery pack, comprising a battery management system, configured to receive a notification of executing charging and discharging once; execute charging and discharging once, wherein, when charging, the battery pack circuit breaker unit is turned on, so that the current of the battery pack flows to the load simulation circuit through the battery pack circuit breaker unit and accumulates in the load simulation circuit; when discharging, the battery pack circuit breaker unit is turned off, so that the current of the battery pack cannot flow to the load simulation circuit; and cyclically execute the charging and discharging action according to the notification of cyclically executing charging and discharging.

[0025] The application provides a method for testing the service life of the battery pack circuit breaker unit, which controls the battery pack circuit breaker unit to cyclically execute charging and discharging, so as to realize the testing of the service life of the whole battery pack circuit breaker unit. The application can test the service life of multiple high-voltage components in the battery pack circuit breaker unit at one time, has higher testing efficiency, and is more in line with the actual situation of the electric vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments of the application. Obviously, the drawings described below are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the drawings.

[0027] Figure 1 A schematic diagram of the battery pack circuit breaker unit test system of the embodiments of the application is shown;

[0028] Figure 2A A flowchart of the battery pack circuit breaker unit test method of the embodiments of the application is shown;

[0029] Figure 2B A signaling diagram of the battery pack circuit breaker unit test method of the embodiments of the application is shown;

[0030] Figure 3A A flow chart of the charging and discharging method of the embodiment of the present application is shown;

[0031] Figure 3B A signaling diagram of the charging and discharging method of the embodiment of the present application is shown;

[0032] Figure 4A A flow chart of the fault processing method of the embodiment of the present application is shown;

[0033] Figure 4B A signaling diagram of the fault processing method of the embodiment of the present application is shown;

[0034] Figure 5 A flow chart of the battery pack circuit breaking unit test method of another embodiment of the present application is shown;

[0035] Figure 6 A schematic diagram of a test device of the embodiment of the present application is shown;

[0036] Figure 7A A schematic diagram of the battery pack circuit breaking unit in the on state of the embodiment of the present application is shown;

[0037] Figure 7B A schematic diagram of the battery pack circuit breaking unit in the off state of the embodiment of the present application is shown;

[0038] Figure 8A A schematic diagram of the load simulation circuit in the charging state of the embodiment of the present application is shown;

[0039] Figure 8B A schematic diagram of the load simulation circuit in the discharging state of the embodiment of the present application is shown;

[0040] Figure 8C A schematic diagram of the load simulation circuit in the off state of the embodiment of the present application is shown;

[0041] Figure 8D A schematic diagram of the load simulation circuit in the off state of another embodiment of the present application is shown. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in further detail below in conjunction with the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0043] In the description of the present application, it should be noted that, unless otherwise specified, the meaning of "a plurality of" is two or more; in addition, the terms "first", "second", "third", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0044] As Figure 1 shown, the present application discloses an innovative test device 300 for controlling the life test of the entire battery pack circuit breaker unit 110. The test device 300 is responsible for controlling the battery pack 100 and the load simulation circuit 200 to make the load simulation circuit 200 perform charging and discharging. The battery pack circuit breaker unit 110 is electrically connected with the load simulation circuit 200. Specifically, one side of the battery pack circuit breaker unit 110 is electrically connected with the total positive and total negative in the battery pack 100, and the other side is electrically connected with the positive and negative of the load simulation circuit 200.

[0045] The battery pack 100 generally includes a plurality of battery cells 120, a battery pack circuit breaker unit 110, and a battery management system 130. The battery pack circuit breaker unit 110 is electrically connected with the total positive and total negative of the plurality of battery cells 120. The battery cell 120 includes a positive plate, a negative plate, and a separator film and electrolyte. The type of battery cell 120 can include lithium ion battery, lithium-sulfur battery, sodium lithium ion battery, sodium ion battery, or magnesium ion battery, etc., and the present application embodiment is not limited thereto. The battery management system 130 is the "brain" of the battery pack 100, which communicates with the battery cell 120, mainly collects and monitors the voltage, current, temperature, etc. of the battery system, realizes the functions of battery state monitoring and analysis, battery safety protection, electric energy control management and information management, etc. The battery management system 130 is generally physically located independently in the battery pack 100. The battery management system 130 also communicates with the battery pack circuit breaker unit 110 to control the closing or opening of the latter to turn on or off the current between the battery system and the electric drive system.

[0046] The load simulation circuit 200 is used to simulate the load of the electric vehicle in the life test, i.e. the electric drive system to realize the test process close to the actual use of the electric vehicle. For simplicity of consideration, the load simulation circuit 200 of the present application is mainly used to simulate the motor. The load simulation circuit 200 can have two connection ports for connecting the positive and negative of the battery pack circuit breaker unit 110. The details of the load simulation circuit 200 will be described below.

[0047] The battery pack circuit breaker unit 110 can be considered as a connection point of the battery pack and the load. The battery pack circuit breaker unit 110, also known as a high-voltage distribution box or a battery cut-off unit, is responsible for the on-off of the current between the battery system and the electric drive system. The battery pack circuit breaker unit 110 generally includes a plurality of components, such as resistors, relays, etc. Physically, the battery pack circuit breaker unit 110 is generally integrated in the battery pack 100. In order to evaluate whether the battery pack circuit breaker unit 110 meets the requirements of the number of uses or the life of the battery pack, the life of the internal battery pack circuit breaker unit 110 of the battery pack 100 will be tested before it is shipped. The usual way is to use the load simulation circuit 200 to simulate the electric drive system.

[0048] The conventional test method only involves the battery pack and the load simulation circuit, and during the test, the load simulation circuit is manually controlled to be turned on or turned off to achieve the purpose of life test. Moreover, only a single component in the battery pack circuit unit 110, such as a resistor, can be tested for its life. That is, the conventional test method cannot test the life of all components in the battery pack circuit unit. The conventional test method has low test efficiency and does not conform to the actual working conditions of the vehicle.

[0049] Compared with the conventional test method, the test method of the present application realizes test automation. In addition, the test method of the present application has higher efficiency, stronger reliability, and more accurate test results, because the test method of the present application can test the life of the entire battery pack circuit unit 110 at one time, i.e., the life of all high-voltage components in the battery pack circuit unit 110.

[0050] As shown in Figure 2A or Figure 2B The present application provides a method for testing the life of a battery pack circuit unit. The battery pack circuit unit 110 belongs to a battery pack 100. The method includes the following actions:

[0051] S100: Inform the battery pack 100 and the load simulation circuit 200 to perform a charge and discharge, wherein when the load simulation circuit 200 performs charging, the current flows from the battery pack 100 to the load simulation circuit 200 and accumulates in the load simulation circuit 200; when the load simulation circuit 200 performs discharging, the electrical energy is consumed in the load simulation circuit 200.

[0052] The battery pack circuit unit 110 includes two interfaces on one side, which are respectively connected to the positive and negative terminals of a plurality of battery cells 120. The battery pack circuit unit 110 includes two interfaces on the other side, which are used as the total interfaces of the battery pack 100 and are respectively connected to the positive and negative terminals of the load simulation circuit 200.

[0053] Informing the battery pack 100 to perform a charge and discharge specifically includes informing the battery management system 130 in the battery pack 100. Then, the battery management system 130 controls the on and off of the battery pack circuit unit 110. The notification can be a message signal or a combination of a message signal and a level signal. The level signal refers to a signal represented by a level value, and the level value is divided into a high level "1" and a low level value "0", which correspond to a high level signal and a low level signal, respectively. In some embodiments, the sender of the notification can be a test device 300, which is specifically described below.

[0054] Charging refers to the battery pack 100 battery pack circuit breaker unit 110 conduction. Load simulation circuit switching to the charging state. Battery pack 100 battery cell 120 current, can be through the battery pack circuit breaker unit 110 to the load simulation circuit 200, in the load simulation circuit 200 accumulation, also can be said to be the load simulation circuit 200 to absorb the electric energy.

[0055] Discharge refers to the battery pack 100 battery pack circuit breaker unit 110 open. Load simulation circuit switching to the discharge state. Battery pack 100 battery cell 120 electric energy, can not be through the battery pack circuit breaker unit 110 to the load simulation circuit 200. Load simulation circuit 200 in the charging process of the electric energy can be consumed in the discharge process.

[0056] Accumulation in the load simulation circuit 200 refers to the current flowing out of the battery pack 100 into the load simulation circuit 200, through the components in the circuit, the electric energy brought by the current into other forms of energy storage.

[0057] Consumption refers to the load simulation circuit 200, in the above discharge process through the components in the circuit, the electric energy into other energy, such as heat or mechanical energy. Through the heat transfer to the outside air dissipation of heat, or in the form of work to release mechanical energy, the load simulation circuit 200 to the electric energy consumption.

[0058] In some embodiments, the step S100 of the notification of the battery pack circuit breaker unit 110 and the load simulation circuit 200 to perform a discharge includes: after the notification of the step S100 of performing a charging action, waiting for a first time period, or when the voltage of the load simulation circuit 200 reaches the voltage threshold, issuing a notification of performing a discharge.

[0059] The first time period can be set according to the time required for the load simulation circuit 200 to complete the charging. The time required for the load simulation circuit 200 to complete the charging is different according to the capacity of the battery pack 100, chemical materials and temperature and other factors. The first time period should be greater than or equal to the time required for the load simulation circuit 200 to complete the charging. Exemplarily, the first time period can be 1s, 2s, 3s, 4s or 5s, etc. The first time period is often regarded by those skilled in the art as the time required for the battery pack 100 to receive the high voltage signal until the completion of the high voltage action.

[0060] The voltage threshold can be set according to the rated voltage of the battery pack 100. For example, the voltage threshold can be set as 50%, 60%, or 80% of the rated voltage, etc. The voltage threshold can be one of 8V, 9V, 10V, 11V, 12V, and preferably 10V. The rated voltage refers to the voltage difference between the total positive electrode and the total negative electrode of the battery pack. As the load simulation circuit 200 performs charging, the voltage of the load simulation circuit 200 gradually rises. When it rises to a certain extent, it indicates that the charging is complete.

[0061] S200: cyclically performing the notification action S100.

[0062] In this embodiment, cyclically performing refers to performing S100 multiple times, i.e., multiple times of notifying the battery pack 100 and the load simulation circuit 200 to perform charging and discharging once. When the charging and discharging once is completed, the next charging and discharging is continued according to a certain procedure.

[0063] Cyclically performing S100 includes, after the notification of performing discharging action once in step S100 is issued, waiting for a second time period, and then cyclically performing S100.

[0064] The second time period can be set according to the time required for the load simulation circuit 200 to complete discharging. The time required for the load simulation circuit 200 to complete discharging varies according to factors such as the capacity, chemical material, and temperature of the battery pack 100 simulated by the load simulation circuit 200. The second time period should be greater than or equal to the time required for the load simulation circuit 200 to complete discharging. For example, the second time period can include 3s, 4s, 5s. In another aspect, the second time period can also be considered as the time from when the battery pack 100 receives the next high voltage signal to when the next high voltage action is completed.

[0065] In some embodiments, cyclically performing S100 further includes: when the number of cycles in step S200 reaches a life threshold, stopping step S200. The life threshold can be the number of times the electric vehicle is started or stopped, or the service life of the electric vehicle. The latter is generally calculated according to the former, for example, according to user requirements, the battery pack circuit breaker unit 110 is required to be used 5000 times, when the number of cycles of the notification reaches 5000 times, the service life requirement of the battery pack circuit breaker unit 110 has been met. At this time, it is not necessary to continue to test the maximum number of cycles of the battery pack circuit breaker unit 110 of the battery pack 100, and the test can be stopped. When the service life of the battery pack circuit breaker unit is measured by the service life of the electric vehicle, those skilled in the art can convert the number of cycles into years. For example, battery pack circuit breaker unit life = number of cycles / estimated value of number of times the electric vehicle is started or stopped per day / 365 days, wherein the unit of battery pack circuit breaker unit life is years, and the estimated value of number of times the electric vehicle is started or stopped per day can be 8, 9, 10, and preferably 10.

[0066] Optionally, or alternatively, the cycle execution S100 further comprises stopping step S200 when the battery pack circuit breaker unit 110 fails. Optionally, the load simulation circuit 200 can be disconnected to ensure the safety of the test personnel. The failure can include the damage of the components of the battery pack circuit breaker unit 110, causing short circuit or open circuit of the battery pack circuit breaker unit 110. These failures can cause the battery pack circuit breaker unit 110 to fail to continue the high-voltage up or high-voltage down operation. When the battery management system 130 detects that the battery pack circuit breaker unit 110 fails, the test device 300 is notified. In some embodiments, the failure can be classified into multiple levels. For example, according to the severity of the failure, the failure levels are classified into level 1, level 2 and level 3 from low to high. The conduction and disconnection hysteresis of the battery pack circuit breaker unit 110 can be classified as level 1. The test can still continue under the hysteresis condition, but the test time is longer. The test does not need to be stopped when the failure is level 1. Level 2 and level 3 can include short circuit and open circuit of the battery pack circuit breaker unit 110, respectively. The short circuit of the battery pack circuit breaker unit 110 causes the electrical energy of the load simulation capacitor 220 to be unable to be released. The open circuit of the battery pack circuit breaker unit 110 causes the electrical energy of the battery pack 100 to be unable to be transmitted to the load simulation circuit 200. The latter two failures will cause the test to be unable to continue.

[0067] Stopping means that the test device 300 no longer sends step S100 to the battery pack 100 and the load simulation circuit 200. The battery pack 100 and the load simulation circuit 200 no longer perform charging and discharging. The conditions for stopping the cycle include two cases, the number of cycle execution notifications reaches the life threshold, or the battery pack 100 has the aforementioned failure.

[0068] S300: Determine the life of the battery pack circuit breaker unit 110 according to the cycle number.

[0069] The cycle number refers to the number of times of notifying the battery pack circuit breaker unit 110 and the load simulation circuit 200 to perform charging and discharging once. The cycle number can be counted by the test device 300 and stored in the memory 390.

[0070] When the life refers to the number of times of starting or stopping the electric vehicle, the above-mentioned cycle number is the life value thereof. In other words, determining the life of the battery pack circuit breaker unit 110 means determining how many times of charging and discharging the battery pack circuit breaker unit 110 can perform. When the life refers to the service life, the life can be obtained by converting the cycle number into the service life according to the above-mentioned formula.

[0071] The cycle execution of the battery pack circuit breaker unit 110 and the load simulation circuit 200 charging and discharging can obtain the life of all high-voltage components in the battery pack circuit breaker unit according to the cycle number, which is more efficient and more consistent with the actual working condition of the electric vehicle.

[0072] As Figure 3Aor Figure 3B As shown, in some embodiments, step S100, which notifies the battery pack 100 and the load simulation circuit 200 to perform a charging operation, may include the following actions:

[0073] S110: Send a high-voltage signal to the battery pack 100 so that the battery pack circuit breaker unit 110 performs the high-voltage action.

[0074] The high-voltage action refers to the battery pack circuit breaker unit 110 switching to the conducting state. This enables the battery pack 100 to output high-voltage electricity from the individual battery cells 120 to the load simulation circuit 200. Specifically, the components within the battery pack circuit breaker unit 110, such as relays, can open or close in a certain sequence. The specific opening and closing sequence is described in detail below.

[0075] The high-voltage signal can be a message signal. The sender of the high-voltage signal can be the test device 300, and the receiver can be the battery management system 130 of the battery pack 100. After receiving the high-voltage signal, the battery management system 130 controls the battery pack circuit breaker unit 110 to perform the high-voltage action.

[0076] S120: Send a charging signal to the load simulation circuit 200 so that the load simulation circuit 200 absorbs electrical energy from the battery pack 100.

[0077] The charging signal can be either a level signal or a message signal. The transmitting entity for the charging signal can be the test device 300. When the charging signal is a level signal, the receiving entity can be the corresponding relay 210 of the load simulation circuit 200. The corresponding relay 210 closes or opens according to the level signal. When the charging signal is a message signal, the receiving entity can be the processor of the load simulation circuit 200. The processor parses the message signal and controls the corresponding relay 210 to close or open.

[0078] The execution order of S110 and S120 is not limited; they can be executed in parallel or serially.

[0079] like Figure 3A or Figure 3B As shown, in step S100, notifying the battery pack 100 and the load simulation circuit 200 to perform a discharge may include the following actions S130 and S140, specifically:

[0080] S130: Send a low-voltage signal to the battery pack 100, causing the battery pack circuit breaker unit 110 to perform a low-voltage action.

[0081] The high-voltage signal can be a message signal. In this embodiment, the transmitter of the high-voltage signal can be the test device 300, and the receiver can be the battery pack 100, such as the battery management system 130 of the battery pack 100. After receiving the high-voltage signal, the battery management system 130 controls the battery pack circuit breaker unit 110 to perform the high-voltage action.

[0082] The high-voltage action refers to the battery pack circuit breaker unit 110 switching to the open state. This disconnects the electrical connection between the battery pack 100 and the load simulation circuit 200. Specifically, components within the battery pack circuit breaker unit 110, such as relays, disconnect in a specific sequence. The specific disconnection sequence is detailed below.

[0083] S140: Send a discharge signal to the load simulation circuit 200 to cause the load simulation circuit 200 to release the absorbed electrical energy.

[0084] The discharge signal can be either a message signal or a level signal. The transmitter of the discharge signal can be the test device 300. When the discharge signal is a message signal, the receiver is the processor of the load simulation circuit 200. After parsing the message signal, the processor controls the corresponding relay 210 to close or open. When the charging signal is a level signal, the receiver is the corresponding relay 210 of the load simulation circuit 200. The corresponding relay 210 closes or opens after receiving the level signal.

[0085] The execution order of the above actions S130 and 140 is not limited; they can be performed in parallel or sequentially.

[0086] like Figure 4A or Figure 4B As shown, in some embodiments, when the battery pack circuit breaker unit 110 fails, in order to identify the fault level and notify the load simulation circuit 200 to disconnect, the battery pack circuit breaker unit 110 life test method may further include the following actions:

[0087] S410: Receives a fault notification from battery pack 100. The receiving entity is test device 300. The receiving object is the battery management system 130 of battery pack 100. The fault notification can be a message signal.

[0088] S420: Battery pack 100 has been determined to have malfunctioned. Determining a malfunction in battery pack 100 means that the testing device 300 analyzes the fault notification and determines the fault level. As shown above, according to the severity of the fault, from low to high, the fault levels can be divided into three levels: Level 1, Level 2, and Level 3.

[0089] S430: When the fault level is high, for example, level 2 and level 3, notify the load simulation circuit 200 to disconnect. The execution subject of the notification is the test device 300. The notification can adopt a message signal or a level signal. The notification of the load simulation circuit 200 to disconnect includes notifying it to disconnect different components, for example, opening different relays, according to different fault levels. The specific content is described in detail below. In this way, the test can be ended or suspended.

[0090] The present application also proposes another test method for testing the service life of the battery pack disconnect unit 110 of the battery pack 100. The execution subject of the battery pack disconnect unit 110 service life test method is the load simulation circuit 200, which corresponds to the steps in FIGS. 2, 3 and 4 whose execution subject is the test device 300. As shown in the figure, the test method includes: Figure 5

[0091] S500: Receive the notification of the load simulation circuit 200 to perform charging and discharging once.

[0092] The S500 step corresponds to S100, and the battery pack 100 receives the notification of the load simulation circuit 200 to perform charging and discharging. Specifically, the receiving subject can be the battery management system 130.

[0093] S510: According to the notification of charging and discharging, respectively control the battery pack disconnect unit 110 to turn on and off, so that when the load simulation circuit 200 performs charging, the current flows from the battery pack 100 to the load simulation circuit 200 and accumulates in the load simulation circuit 200; when the load simulation circuit 200 performs discharging, the electrical energy is consumed in the load simulation circuit 200.

[0094] In some embodiments of the present application, respectively controlling the battery pack disconnect unit 110 to turn on and off means that according to the notification of charging, controlling the battery pack disconnect unit 110 to switch to the on state according to the high-voltage action, so that the current flows from the battery pack 100 to the load simulation circuit 200 and accumulates in the load simulation circuit 200. And according to the notification of discharging, controlling the battery pack disconnect unit 110 to switch to the off state according to the low-voltage action, so that the current cannot flow from the battery pack 100 to the load simulation circuit 200.

[0095] S520: According to the notification of cyclically performing charging and discharging, cyclically control the battery pack disconnect unit 110 to turn on and off.

[0096] ​After the second time period of the discharging action of the battery pack 100 is performed, the test device 300 sends a charging and discharging notification again, the battery pack 100 receives the charging and discharging notification again, and performs the charging and discharging action, the time corresponding to the charging action is consistent with the time of the high-voltage-up action in the foregoing embodiment, and the time corresponding to the discharging action is consistent with the time of the high-voltage-down action in the foregoing embodiment.

[0097] As shown in FIG. 1, the present application provides a test device 300 for testing the service life of the battery pack circuit breaker unit 110 of the battery pack 100. As shown in FIG. 2, the test device 300 communicates with the battery pack 100 and the load simulation circuit 200. The test device 300 comprises a notification unit 310 for notifying the battery pack 100 to perform a charging and discharging action once, a central processing unit 380 for controlling the notification unit 310 to perform the notification action cyclically, and a counter 320 for counting the number of cycles. The central processing unit 380 is further configured to determine the service life of the battery pack circuit breaker unit according to the number of cycles. Figure 6 Figure 1 As shown in FIG. 1, the present application provides a test device 300 for testing the service life of the battery pack circuit breaker unit 110 of the battery pack 100. As shown in FIG. 2, the test device 300 communicates with the battery pack 100 and the load simulation circuit 200. The test device 300 comprises a notification unit 310 for notifying the battery pack 100 to perform a charging and discharging action once, a central processing unit 380 for controlling the notification unit 310 to perform the notification action cyclically, and a counter 320 for counting the number of cycles. The central processing unit 380 is further configured to determine the service life of the battery pack circuit breaker unit according to the number of cycles.

[0098] Specifically, the notification unit 310 is configured to notify the battery pack 100 of a high-voltage-up signal and notify the load simulation circuit 200 of a charging signal. The notification unit 310 is further configured to notify the battery pack 100 of a high-voltage-down signal and notify the load simulation circuit 200 of a discharging signal. In some embodiments, the notification unit 310 is further configured to send a fault notification to the load simulation circuit 200.

[0099] In some embodiments, the central processing unit 380 is further configured to obtain the number of cycles from the counter 320. When the service life is represented by the number of cycles, the central processing unit 380 directly uses the number of cycles. When the service life is represented by the service life in years, as described above, the central processing unit 380 calculates the service life in years according to the number of cycles. The test device 300 further comprises a display unit 340 for displaying the service life in a visual manner so that the tester can know the service life value.

[0100] In some embodiments, the test device 300 further comprises a receiving unit 330 for receiving a fault notification from the battery pack 100. Correspondingly, the central processing unit 380 is further configured to determine the fault level of the battery pack 100 and instruct the notification unit 310 to send a fault notification to the load simulation circuit 200 as appropriate.

[0101] ​In some embodiments, the testing device 300 further comprises an alarm unit 350 for controlling the alarm unit 350 to alarm when a testing failure is found in the central processor 380. The testing failure can be that the battery pack circuit breaker unit 110 has the above-mentioned failure, a component of the load simulation circuit 200 has a failure, the connection between the battery pack 100 and the load simulation circuit 200 is disconnected, or the battery management system 130 loses response when a battery cell 120 has a failure. At this time, the alarm unit 350 can issue an alarm. The alarm forms include but are not limited to indicator light blinking and sound alarm. The on-site tester can know other failure types through the alarm. At this time, the testing steps S100-S300 will be suspended. Wait for the on-site tester to repair the failure, and after the repair is completed, the test continues.

[0102] The test device 300 also includes a memory 390. The memory 390 can include mass storage for data or instructions. By way of example, and not limitation, memory 390 can include a hard disk drive (HDD), floppy disk drive, flash memory, compact disk, digital versatile disk, optical disk, tape, or universal serial bus (USB) drive or combination of two or more of these. In some examples, the memory 390 can include removable or non-removable media, or the memory is a nonvolatile solid-state memory. In some embodiments, the memory 390 can be internal or external to the battery pack 100. In some examples, the memory 390 can be a read only memory (ROM). In one example, the ROM can be a mask programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), electrically alterable ROM (EAROM), or flash memory or combination of two or more of these. The memory 390 can include a read only memory (ROM), random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, the memory 390 includes one or more tangible computer readable storage media encoded with software comprising computer executable instructions and when the software is executed, it is operable to perform operations described with reference to the methods according to an aspect of the present disclosure. The memory 390 stores a control program for the battery pack circuit breaker unit 110 life test method described above, which is executed by the notification unit 310, the central processor 380, the counting unit 320, the alarm unit 350, the receiving unit 330, and the display unit 340, respectively. The control program includes message information and level information, as well as counting information for the number of notification cycles. It also includes fault information, which includes fault notifications to be sent when fault information is received from the battery management system 130. The central processor 380 implements the methods / steps in the embodiments shown in FIGS. 2-4 by reading and executing computer program instructions stored in the memory 390 to achieve the corresponding technical effects achieved by the methods / steps in the examples shown in FIGS. 2-4, and the specific implementation methods / steps of the embodiments are as described above. Figure 5 The central processor 380 implements the methods / steps in the embodiments shown in FIGS. 2-4 by reading and executing computer program instructions stored in the memory 390 to achieve the corresponding technical effects achieved by the methods / steps in the examples shown in FIGS. 2-4, and the specific implementation methods / steps of the embodiments are as described above. Figure 5 The central processor 380 implements the methods / steps in the embodiments shown in FIGS. 2-4 by reading and executing computer program instructions stored in the memory 390 to achieve the corresponding technical effects achieved by the methods / steps in the examples shown in FIGS. 2-4, and the specific implementation methods / steps of the embodiments are as described above.

[0103] Based on the same inventive concept, the present application proposes an innovative battery pack including a battery management system 130. The battery management system 130 is configured to communicate with the test device 300.

[0104] The battery management system 130 is configured to collect, process, store and transmit the voltage, current and other information of the battery cells 120 and the battery pack circuit breaker unit 110 during the use of the battery pack 100 to the testing device 300. The voltage information can include the voltage across the battery pack circuit breaker unit 110 and / or the voltage across the internal components of the battery pack circuit breaker unit 110, such as the voltage across the main negative relay 114 or the voltage across the pre-charge relay 112.

[0105] The battery management system 130 includes a communication module configured to receive the charging and discharging notifications from the testing device in the above embodiments. The battery management system 130 also includes a controller configured to control the battery pack circuit breaker unit 110 to perform the corresponding charging or discharging action based on the charging and discharging notifications. When performing the charging action, the controller of the battery management system 130 controls the corresponding relay of the battery pack circuit breaker unit 110 to close to achieve the conduction of the battery pack circuit breaker unit 110. When performing the discharging action, the controller of the battery management system 130 controls the corresponding relay of the battery pack circuit breaker unit 110 to open to achieve the conduction of the battery pack circuit breaker unit 110.

[0106] The communication module of the battery management system 130 is also configured to receive the cycling notification from the testing device 300. Accordingly, the controller of the battery management system 130 controls the battery pack circuit breaker unit 110 to perform the charging and discharging cyclically.

[0107] The communication module of the battery management system 130 is also configured to send the above fault notification to the testing device 300 when a fault occurs in the battery pack circuit breaker unit 110. Accordingly, the controller of the battery management system 130 is also configured to identify the fault level at a certain frequency. The controller of the battery management system 130 can identify the fault level based on the voltage across the components, the time of performing the closing or opening, and other information. For example, when a short circuit occurs in a component of the battery pack circuit breaker unit 110, the voltage across the component will be the same and equal to the total voltage. When an open circuit occurs, the voltage at one end will be 0. When a delay occurs, the voltage change time of the relay with the delay will be significantly different from the time of receiving the notification by the battery management system 130. When the controller of the battery management system 130 identifies different fault levels, the communication module is also configured to send the fault notification carrying the specific fault level information to the testing device 300.

[0108] As known to those skilled in the art, the battery management system 130 is generally a printed circuit board (PCB). The above communication module and controller are integrated circuits or components soldered on the PCB.

[0109] Without limitation, the test method of the embodiments of the present application can be applied to any structure of battery pack circuit breaking unit. For the purpose of explaining the on and off process and principle of the battery pack circuit breaking unit, the components and their connection relationship in the battery pack circuit breaking unit can be referred to Figure 7A and 7B .

[0110] The battery pack circuit breaking unit 110 can include a main positive relay 111 and a main negative relay 114. The main positive relay 111 is connected with the total positive pole of the plurality of battery cells 120. The main negative relay 114 is connected with the total negative pole of the plurality of battery cells 120. The main positive relay 111 and the main negative relay 114 are respectively used to open / close the electrical connection with the total positive pole and the total negative pole. A relay is an electrically operated switch. When the voltage or current input reaches a threshold value, the relay will open or close. The main positive relay 111 and the main negative relay 114 can be any type of relay available, such as electromagnetic relay, time relay, thermal relay, etc. The main positive relay 111 and the main negative relay 114 should be high-voltage components, which can withstand the high voltage of the total positive pole and the total negative pole. According to the design requirements of the battery pack, sometimes the voltage of the total positive pole and the total negative pole can be as high as 1000V.

[0111] Optionally, the battery pack circuit breaking unit 110 further includes a pre-charge circuit. The pre-charge circuit plays a role of limiting the charging current of the capacitor at the moment of power-on, so as to protect the components in the load analog circuit 200, such as the capacitor, from being damaged by the large current at the moment. The pre-charge circuit is connected in parallel with the main positive relay 111. The pre-charge circuit can include a pre-charge relay 112 and a pre-charge resistor 113. The two are connected in series and are also high-voltage components.

[0112] The high-voltage operation generally includes first opening the main positive relay 111, closing the pre-charge circuit and the main negative relay 114. Then, closing the main positive and main negative relays 114 and opening the pre-charge circuit. For example, the high-voltage operation includes first closing the pre-charge relay 112 and the main negative relay 114, opening the main positive relay 111 (not shown in the figure), and then closing the main positive relay 111 and the main negative relay 114, opening the pre-charge relay 112 (as shown in the figure). Figure 7AThe battery pack breaker unit 110 is in the on state when the load simulation circuit 200 is charging. Specifically, the main positive relay 111 and the main negative relay 114 are closed, and the pre-charge relay 112 is open. At this time, the current loop is formed between the battery cells 120, the battery pack breaker unit 110, and the load simulation circuit 200. Specifically, the current flows from the total positive pole of the battery cells 120, through the main positive relay 111 of the battery pack breaker unit 110, to the load simulation circuit 200, and then flows through the main negative relay 114 back to the total negative pole of the battery cells 120.

[0113] As shown in FIG. 2, when the load simulation circuit 200 is charging, the battery pack breaker unit 110 is in the on state. Specifically, the main positive relay 111 and the main negative relay 114 are closed, and the pre-charge relay 112 is open. At this time, the current loop is formed between the battery cells 120, the battery pack breaker unit 110, and the load simulation circuit 200. Specifically, the current flows from the total positive pole of the battery cells 120, through the main positive relay 111 of the battery pack breaker unit 110, to the load simulation circuit 200, and then flows through the main negative relay 114 back to the total negative pole of the battery cells 120. Figure 7A As shown in FIG. 2, when the load simulation circuit 200 is charging, the battery pack breaker unit 110 is in the on state. Specifically, the main positive relay 111 and the main negative relay 114 are closed, and the pre-charge relay 112 is open. At this time, the current loop is formed between the battery cells 120, the battery pack breaker unit 110, and the load simulation circuit 200. Specifically, the current flows from the total positive pole of the battery cells 120, through the main positive relay 111 of the battery pack breaker unit 110, to the load simulation circuit 200, and then flows through the main negative relay 114 back to the total negative pole of the battery cells 120.

[0114] Figure 7B As shown in FIG. 2, when the load simulation circuit 200 is charging, the battery pack breaker unit 110 is in the on state. Specifically, the main positive relay 111 and the main negative relay 114 are closed, and the pre-charge relay 112 is open. At this time, the current loop is formed between the battery cells 120, the battery pack breaker unit 110, and the load simulation circuit 200. Specifically, the current flows from the total positive pole of the battery cells 120, through the main positive relay 111 of the battery pack breaker unit 110, to the load simulation circuit 200, and then flows through the main negative relay 114 back to the total negative pole of the battery cells 120.

[0115] In some embodiments, the voltage of the load simulation circuit 200 described above can be represented by the difference between the voltages across the main positive relay 111. Accordingly, the battery management system 130 can obtain the voltage difference across the main positive relay 111 at a certain period. Then, the battery management system 130 sends the voltage difference to the testing device 300 at a certain period. The period can include 100 ms, 150 ms, 200 ms, and preferably 100 ms.

[0116] In some embodiments, the short circuit of the battery pack breaker unit 110 can include the main positive relay 111, the main negative relay 114, and the pre-charge relay 112 being stuck.

[0117] ​In some embodiments, the battery pack circuit breaking unit 110 can further include a voltage meter for measuring the voltage across different components of the battery pack circuit breaking unit 110. Accordingly, the battery management system 130 can obtain the voltage value of the voltage meter, and further identify the failure of the components in the battery pack circuit breaking unit 110.

[0118] For the purpose of explaining the charging and discharging process of the load simulation circuit 200 only, Figure 8A or Figure 8B An example of the load simulation circuit 200 is provided. Those skilled in the art can understand that the test method of the embodiments of the present application can be applied to any load simulation circuit.

[0119] As Figure 8A shown, the load simulation circuit 200 includes a processor 240, a load simulation capacitor 220, a first relay 210, a bleeder resistor 230, and a second relay 250. The first relay 210 is connected in series with the bleeder resistor 230 and the load simulation capacitor 220. The first relay 210 is used to turn on or turn off the electrical connection between the bleeder resistor 230 and the load simulation capacitor 220. The second relay 250 is connected in series with the other three components, and is used as the total switch of the load simulation circuit 200, for turning on or turning off the electrical connection between the load simulation circuit 200 and the battery pack 100.

[0120] The load simulation circuit 200 includes a processor 240 for receiving the charging and discharging notifications, such as messages, and controlling the turning on and turning off of the corresponding relays. The load simulation circuit 200 is switched between the charging state and the discharging state.

[0121] In some embodiments, in the charging and discharging actions, the first relay 210 can be a long-life and more durable relay because it needs to be repeatedly turned off and turned on. When the load simulation circuit 200 receives the failure notification, the relay that needs to be turned off is the second relay 250. The second relay 250 can be a sensitive relay because it needs to be turned off immediately when a failure occurs. The first relay 210 and the second relay 250 can be normally open relays or normally closed relays. In some embodiments, when the failure notification is a low-level signal, the second relay 250 receiving the level signal can be a normally open relay. When the failure notification is a high-level signal, the second relay 250 is a normally closed relay, and the level signal is a low-level signal. The first relay 210 and the second relay 250 include but are not limited to electromagnetic relays, inductive relays, electric relays, and electronic relays, as long as they can achieve the technical solutions of the present application. In another aspect, the first relay 210 and the second relay 250 can be high-power relays.

[0122] Preferably, the load simulation capacitor 220 can be a safety capacitor. Failure of the safety capacitor will not cause capacitor breakdown and will not endanger the personal safety of personnel at the testing site. More preferably, the safety capacitor can be an X-type power supply electromagnetic interference suppression capacitor. X-type power supply electromagnetic interference suppression capacitors are large in size, allow for large instantaneous charging and discharging currents, and have relatively low internal resistance, resulting in good charging stability. They can simulate the drive motor, on-board charger, and electric compressor used in actual electric vehicles.

[0123] Charging the load simulation circuit 200 can be considered as charging the load simulation capacitor 220 within the load simulation circuit 200. Capacitor charging refers to the process where, after connecting the capacitor to the power supply, current flows from the power supply to the capacitor and accumulates in it. The charging process is complete when no more current flows between the power supply and the capacitor. Specifically, in this application, after connecting the load simulation capacitor 220 to the battery pack 100, current flows from the battery pack 100 to the load simulation capacitor 220, accumulating electrical charge in the load simulation capacitor 220. For example... Figure 8A As shown, upon receiving a charging notification, the processor 240 controls the first relay 210 to close and the second relay 250 to open. At this time, the load simulation circuit 200 performs charging. The battery cells 120, the battery pack circuit breaker 110, and the load simulation circuit 200 form a current loop. Current flows from the total positive terminal of the battery cells 120, through the battery pack circuit breaker 110, to the load simulation circuit 200, and then back to the total negative terminal of the battery cells 120. The load simulation capacitor 220 in the load simulation circuit 200 absorbs electrical energy from the battery cells 120 for charging.

[0124] The discharge of the load simulation circuit 200 can be considered as the discharge of the load simulation capacitor 220 within the load simulation circuit 200. Capacitor discharge refers to the process by which a capacitor converts its stored electrical energy into other forms of energy in a circuit through the work done by current. The capacitor discharges through a resistor. The resistor converts electrical energy into other forms of energy. The discharge process is complete when the voltage between the two conductive parallel plates of the capacitor drops to a certain value. Specifically, in this application, after disconnecting the load simulation capacitor 220 from the battery pack 100, the load simulation capacitor 220 discharges through the bleeder resistor 230. Figure 8BAs shown, when receiving the discharge notification, the processor 240 controls the first relay 210 and the second relay 250 to be closed. At this time, the load simulation circuit 200 performs discharge. The load simulation capacitor 220, the first relay 210 and the discharge resistor 230 form a current loop. The current flows from the load simulation capacitor 220 to the discharge resistor 230. The electric energy in the load simulation capacitor 220 is discharged through the discharge resistor 230. At this time, the electric energy of the battery cell 120 in the battery pack 100 cannot flow to the load simulation circuit 200 through the battery pack circuit breaking unit 110.

[0125] Preferably, the discharge resistor 230 can include an aluminum shell braking resistor. When the discharge resistor 230 is connected with the load simulation capacitor 220, the discharge resistor 230 can discharge the residual charge in the load simulation capacitor 220 within a certain time, such as 5s. The voltage in the capacitor is quickly reduced to the target voltage, ensuring that the charging current of the load simulation capacitor 220 is close to the vehicle working condition.

[0126] The battery management system 130 notifies the load simulation circuit 200 of the fault through the test device 300. For different fault levels, the load simulation circuit 200 can be notified to take different processing actions. As described above, when the fault notification is a message signal, the processor 240 is further configured to receive and analyze the above fault notification, and control the second relay 250 to be opened, thereby protecting the load simulation circuit 200. When the notification is a level signal, the receiving subject of the fault notification is the corresponding relay. The level signal makes the corresponding relay 250 open or close. For example, the short circuit fault of the battery pack circuit breaking unit 110 is defined as level 3, the open circuit fault is defined as level 2, and the hysteresis of the battery pack circuit breaking unit 110 is defined as level 1. When the test device 300 determines that a level 3 fault occurs, the first fault notification is sent to the load simulation circuit 200. The load simulation circuit 200 is notified to close the first relay 210 and open the second relay 250, as shown. In this way, the connection with the load simulation circuit 200 can be disconnected, and the electric energy in the simulation load 220 can be released. In this way, the safety of the tester can be ensured, and the tester can facilitate subsequent inspection or diagnosis of the load simulation circuit 200. Figure 8C As shown, the first relay 210 is closed. When the test device 300 determines that a level 1 fault occurs, no fault notification can be sent to the load simulation circuit 110. Figure 8D

[0127] ​In some embodiments, a failure of a component of the load simulation circuit 200 can also cause the test to fail. For example, a certain relay in the load simulation circuit 200 can be stuck, or the load simulation capacitor 220 can be damaged and unable to charge and discharge. In this case, the processor 240 can send an alarm signal and disconnect the load simulation circuit 200 from the battery pack 100, and the test steps S100-S300 can be suspended, and the count unit records the number of cycles. The on-site tester can repair the failure, and after the repair is completed, the test can continue.

[0128] The foregoing embodiments use an electric vehicle as an example for illustration, and for those skilled in the art, the high-voltage circuit test method and device can also be applied to energy storage systems. When applied to energy storage systems, the load simulated by the load simulation circuit 200 can be a power grid, an industrial backup power supply, a data center and base station, and a household electrical load, etc.

[0129] In some embodiments, the test device 300, the battery management system 130, and the processor 240 can further include a communication interface for enabling communication between the modules, devices, units, and / or equipment in the embodiments of the present application. The communication interface can use any known communication protocol suitable for the embodiments of the present application, and is preferably a Controller Area Network (CAN) bus protocol or a Local Interconnect Network (LIN) bus protocol. The message in the embodiments of the present application can be a message under the corresponding communication protocol. When the message protocol is the CAN bus protocol, the message protocol can be a data frame or a remote frame message in the CAN protocol. The message header can include CAN00 or CAN01, and the message content can include an arbitration segment, a control segment, a data segment, a CRC segment, an ACK segment, and an end-of-frame segment, wherein the data segment can be omitted. When the message protocol is the LIN bus protocol, the message header can include LIN00 or LIN01, and the message content can include a synchronization interval segment, a synchronization segment, a protected ID segment, a data segment, and a checksum segment.

Claims

1. A method of testing the lifetime of a battery pack circuit breaking unit (110), characterized by, The battery pack circuit breaking unit (110) belongs to a battery pack (100), comprising: informing (S100) the battery pack (100) and a load simulation circuit (200), the load simulation circuit (200) performing a charging and discharging, wherein, when the load simulation circuit (200) performs the charging, the current flows from the battery pack (100) to the load simulation circuit (200) and accumulates in the load simulation circuit (200); when the load simulation circuit (200) performs the discharging, the electric energy is consumed in the load simulation circuit (200); cycling (S200) the informing (S100) action; determining (S300) the life of the battery pack circuit breaking unit (110) according to the number of cycles.

2. The method of claim 1, wherein, The informing (S100) the battery pack (100) and the load simulation circuit (200) includes: sending (S110) an upper high voltage signal to the battery pack (100) to make the battery pack circuit breaking unit (110) perform an upper high voltage action; and sending (S120) a charging signal to the load simulation circuit (200) to make the load simulation circuit (200) absorb the electric energy of the battery pack (100).

3. The method according to claim 1 or 2, characterized in that, The informing (S100) the battery pack (100) and the load simulation circuit (200) includes: sending (S130) a lower high voltage signal to the battery pack to make the battery pack circuit breaking unit (110) perform a lower high voltage action; sending (S140) a discharging signal to the load simulation circuit (200) to make the load simulation circuit (200) release the absorbed electric energy.

4. The method of claim 3, wherein, The informing (S100) the battery pack (100) and the load simulation circuit (200) includes: after the informing (S100) performs the charging action once, waiting for a first time period; or when the voltage of the load simulation circuit (200) reaches a voltage threshold, informing (S100) the battery pack (100) and the load simulation circuit (200), the load simulation circuit (200) performing the discharging.

5. The method according to any one of claims 1 to 4, characterized in that, The cycling (S200) the informing (S100) action includes: after the informing (S100) performs the discharging action once, waiting for a second time period, and then performing the cycling (S200) action.

6. The method according to any one of claims 1 to 5, characterized in that, When the number of times of cycling (S200) the informing (S100) action reaches a life threshold, stop the cycling (S200).

7. The method according to any one of claims 1 to 6, characterized in that, When the battery pack (100) fails, stop the cycling (S200).

8. The method of claim 7, wherein, Further comprising: receiving (S410) a failure notification from the battery pack (100), and determining (S420) that the battery pack (100) fails according to the failure notification.

9. The method according to any one of claims 7-8, characterized in that, Further comprising: When the battery pack (100) fails, inform (S430) the load simulation circuit (200) to disconnect.

10. The method of claim 9, wherein, The upper high-voltage action includes: turning on the battery pack circuit breaker unit (110), so that the current of the battery pack (100) can flow through the battery pack circuit breaker unit (110) to the load simulation circuit (200) and accumulate in the load simulation circuit (200).

11. The method of claim 9, wherein, The lower high-voltage action includes: turning off the battery pack circuit breaker unit (110), so that the current of the battery pack (100) cannot flow to the load simulation circuit (200).

12. The method according to any one of claims 1 to 11, characterized in that, The notification adopts a message of a controller area network bus protocol or a local interconnect network bus protocol.

13. A test device (300) characterized by A test device for testing the service life of a battery pack circuit breaker unit (110) belonging to a battery pack (100), the test device comprising: A notification unit (310) for notifying (S100) the battery pack (100) and a load simulation circuit (200) to perform a charge and discharge once; A central processing unit (380) for controlling the notification unit (310) to perform the notification (S100) action in a cycle (S200); A counter (320) for counting the number of cycles; The central processing unit (380) is further configured to determine (S300) the service life of the battery pack circuit breaker unit according to the number of cycles.

14. A test method characterized by, A method for testing the service life of a battery pack circuit breaker unit (110) belonging to a battery pack (100), the method comprising: Receiving (S500) a notification of a load simulation circuit (200) performing a charge and discharge once, wherein, According to the charge and discharge notification, respectively control (S510) the battery pack circuit breaker unit (110) to turn on and turn off, so that when the load simulation circuit (200) performs the charge, the current flows from the battery pack (100) to the load simulation circuit (200) and accumulates in the load simulation circuit (200); when the load simulation circuit (200) performs the discharge, the electrical energy is consumed in the load simulation circuit (200); According to the cycle, the battery pack circuit breaker unit (110) is controlled to turn on and turn off in a cycle (S520).

15. A battery pack, characterized by The battery management system (130) is configured to: Receive a notification of performing a charge and discharge once; Perform (S510) the charge and discharge once, wherein, during the charge, turn on the battery pack circuit breaker unit (110), so that the current of the battery pack (100) flows through the battery pack circuit breaker unit (110) to the load simulation circuit (200) and accumulates in the load simulation circuit (200); during the discharge, turn off the battery pack circuit breaker unit (110), so that the current of the battery pack (100) cannot flow to the load simulation circuit (200); and According to the cycle, the battery pack circuit breaker unit (110) is controlled to turn on and turn off in a cycle (S520).

Images