A battery management system testing method and apparatus

Abstract

The application discloses a kind of battery management system test method and device.The battery management system test method includes: data processing equipment obtains the target current variation relationship of battery under preset working condition;Wherein, preset working condition at least includes the charging time and discharging time of battery;Temperature chamber controls the temperature inside temperature chamber according to target temperature variation relationship;Wherein, battery and the battery management system to be measured connected with battery are arranged in temperature chamber;Charging and discharging machine controls battery to carry out charging and discharging according to target current variation relationship, so that the battery management system to be measured connected with battery enters working state;During the process that battery carries out charging and discharging, temperature acquisition equipment obtains the temperature information of preset point in battery management system to be measured.The technical scheme of the embodiment of the application improves the comprehensiveness and accuracy of battery management system temperature test.

Description

A battery management system testing method and apparatus Technical Field

[0001] This invention relates to the field of testing technology, and in particular to a battery management system testing method and apparatus. Background Technology

[0002] In automotive battery management systems (BMS), temperature is an extremely influential factor. Harsh ambient temperatures, coupled with the BMS's operational mode, can easily lead to significant temperature rises in certain components of the battery management controller, consequently increasing the battery temperature within the vehicle. Therefore, it is necessary to test the battery management system and obtain temperature rise data under harsh operating conditions.

[0003] Currently, temperature testing of battery management systems mainly focuses on the overall temperature of the battery management system or the temperature of the environment in which the battery management system is located. Moreover, it mainly focuses on the temperature test under the condition of continuous charging or discharging of the battery. It cannot accurately obtain the temperature data of the battery management system during the actual operation of the vehicle. Therefore, it is not possible to comprehensively and accurately test the temperature of the battery management system. Summary of the Invention

[0004] This invention provides a battery management system testing method and apparatus to achieve comprehensive and accurate temperature testing of the battery management system.

[0005] According to one aspect of the present invention, a battery management system testing method is provided, the battery management system testing method comprising:

[0006] Obtain the target current change relationship of the battery under preset operating conditions; wherein, the preset operating conditions include at least the charging time and discharging time of the battery;

[0007] The temperature inside the chamber is controlled according to the target temperature change relationship; wherein, the chamber is equipped with the battery and a battery management system connected to the battery;

[0008] The battery is charged and discharged according to the target current change relationship, so that the battery management system connected to the battery enters the working state;

[0009] During the charging and discharging process of the battery, the temperature information of preset points in the battery management system under test is acquired.

[0010] Optionally, before controlling the ambient temperature of the chamber according to the target temperature change relationship, the method further includes:

[0011] The target temperature change relationship of the environment in which the battery management system under test is located is obtained during vehicle operation.

[0012] Optionally, obtaining the target current change relationship of the battery under preset operating conditions includes:

[0013] Obtain the initial current change relationship of the battery under the preset operating conditions;

[0014] The initial current variation relationship is derating to obtain the target current variation relationship.

[0015] Optionally, during the charging and discharging process of the battery, the following steps are also included:

[0016] The threshold judgment conditions in the battery management system under test are masked so that the battery will still charge and discharge when the battery temperature exceeds the temperature threshold or the battery current exceeds the current threshold.

[0017] Optionally, obtaining the temperature information of preset points in the battery management system under test includes:

[0018] The temperature information of preset points on the printed circuit board of the battery management system under test is obtained.

[0019] Optionally, obtaining the temperature information of preset points on the printed circuit board of the battery management system under test includes:

[0020] Temperature information is acquired from the surfaces of the shunt, transistor, power chip, port connected to the battery, external power supply interface, voltage acquisition chip, and processor on the printed circuit board.

[0021] According to another aspect of the present invention, a battery management system testing apparatus is provided, comprising: a data processing device, a temperature chamber, a charge / discharge machine, and a temperature acquisition device; the temperature chamber contains a battery and a battery management system under test connected to the battery; the temperature chamber is used to control the internal temperature of the temperature chamber according to a target temperature change relationship.

[0022] The data processing device is connected to the charge / discharge machine, and the data processing device is used to obtain the target current change relationship of the battery under preset operating conditions; wherein, the preset operating conditions include at least the charging time and discharging time of the battery;

[0023] The charge / discharge machine is connected to the battery, and the charge / discharge machine is used to control the battery to charge and discharge according to the target current change relationship, so that the battery management system under test connected to the battery can enter the working state.

[0024] The temperature acquisition device is connected to multiple preset points in the battery management system under test. The temperature acquisition device is used to acquire the temperature information of the preset points in the battery management system under test during the charging and discharging process of the battery.

[0025] Optionally, the battery management system testing device further includes: a host computer;

[0026] The host computer is connected to the battery management system under test. The host computer is used to shield the threshold judgment conditions in the battery management system under test so that the battery will still charge and discharge when the battery temperature exceeds the temperature threshold or the battery current exceeds the current threshold.

[0027] Optionally, the battery management system testing apparatus further includes: a power supply device;

[0028] The power supply device is connected to the power supply terminal of the battery management system under test, and the power supply device is used to supply power to the battery management system under test.

[0029] Optionally, the temperature acquisition device includes multiple thermocouples, each thermocouple being set in a one-to-one correspondence with a preset point, and the thermocouples being attached to the preset point.

[0030] The technical solution of this invention obtains the target current change relationship of the battery under preset operating conditions. These preset operating conditions include, for example, the battery charging and discharging within a short period, i.e., the battery charging and discharging under harsh conditions while the vehicle is running. This allows for the acquisition of the target current change relationship during charging and discharging under harsh conditions, thereby obtaining the temperature information of the battery management system under test (BMS) when the battery is operating under harsh conditions. This makes the acquired temperature information more consistent with the actual temperature of the BMS during practical application, thus improving the accuracy of the BMS test. By inputting the target temperature change relationship into a temperature chamber, the chamber controls its internal temperature according to the target temperature change relationship, ensuring that the ambient temperature of the BMS under test matches the actual ambient temperature of the BMS during vehicle operation in harsh environments, further improving the accuracy of the BMS test. The charge / discharge machine of the BMS test device controls the battery to charge and discharge according to the target current change relationship, recreating the actual operating state of the BMS under test. Furthermore, the temperature acquisition device acquires the temperature information at preset points within the BMS under test for testing. Obtaining the temperature information at preset points within the BMS facilitates a more complete analysis of the temperature changes of the BMS under harsh conditions. The technical solution of this invention solves the problem of not being able to fully obtain the temperature data of the battery management system during the actual operation of a car, and improves the comprehensiveness and accuracy of the temperature test of the battery management system.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 is a flowchart of a battery management system testing method provided in an embodiment of the present invention;

[0034] Figure 2 is a flowchart of another battery management system testing method provided in an embodiment of the present invention;

[0035] Figure 3 is a partial curve diagram of the relationship between the initial current change and the target current change provided in an embodiment of the present invention;

[0036] Figure 4 is a graph showing the target temperature change relationship provided in an embodiment of the present invention;

[0037] Figure 5 is a flowchart of another battery management system testing method provided by an embodiment of the present invention;

[0038] Figure 6 is a schematic diagram of a battery management system provided in an embodiment of the present invention;

[0039] Figure 7 is a schematic diagram of a battery management system testing device provided in an embodiment of the present invention;

[0040] Figure 8 is a structural schematic diagram of another battery management system testing device provided in an embodiment of the present invention. Detailed Implementation

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the term "comprising" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0043] To address the problem mentioned in the background art that temperature testing under continuous charging or discharging conditions of a battery cannot accurately obtain temperature data of the battery management system during actual vehicle operation, this invention provides a battery management system testing method. Figure 1 is a flowchart of a battery management system testing method provided by this invention, which is executed by a battery management system testing device. As shown in Figure 1, the method includes:

[0044] S110. Obtain the target current change relationship of the battery under preset operating conditions; wherein, the preset operating conditions include at least the charging time and discharging time of the battery.

[0045] Specifically, the preset operating conditions include at least the battery's charging and discharging times. For example, a preset operating condition might be a short period of charging and discharging of the battery. This means the battery doesn't continuously discharge to its minimum capacity and then continuously charge to its maximum capacity, but rather repeatedly alternates between charging and discharging within a short time. In other words, the preset operating conditions represent the battery's charging and discharging under harsh conditions while the vehicle is running. The target current change relationship is, for example, the relationship between current and time. By obtaining the target current change of the battery under the preset operating conditions, the target current change relationship during charging and discharging under harsh conditions while the vehicle is running can be obtained. This allows for the acquisition of temperature information for the battery management system under test when the battery is operating under harsh conditions, making the obtained temperature information more consistent with the actual temperature of the battery management system in real-world applications, thereby improving the accuracy of battery management system testing.

[0046] S120. Control the temperature inside the chamber according to the target temperature change relationship; wherein, the chamber is equipped with a battery and a battery management system connected to the battery.

[0047] Specifically, the battery and the battery management system (BMS) connected to it are placed in a temperature chamber, which can be configured to set the ambient temperatures for both the battery and the BMS. The target temperature variation relationship is the relationship between the ambient temperature of the BMS and time during actual vehicle operation, specifically the relationship when the vehicle is operating in harsh environments, such as when the vehicle is operating at the highest global temperatures. This also incorporates temperature changes caused by the vehicle's own water cooling during operation. Therefore, by inputting the target temperature variation relationship into the temperature chamber, the chamber controls its internal temperature accordingly, ensuring that the ambient temperature of the BMS matches the actual ambient temperature of the BMS during vehicle operation in harsh environments. This further improves the accuracy of the BMS testing.

[0048] S130. Control the battery to charge and discharge according to the target current change relationship so that the battery management system connected to the battery can enter the working state.

[0049] Specifically, the target current change relationship is input into the charge / discharge machine of the battery management system test device. The charge / discharge machine controls the battery to charge and discharge according to the target current change relationship, so that the battery's working state is consistent with the battery's working state when the vehicle is actually running. Furthermore, the battery management system under test connected to the battery is consistent with the working state of the battery management system when the vehicle is actually running, thereby restoring the working state of the battery management system under test when it is actually running, which helps to improve the accuracy of the test of the battery management system under test.

[0050] S140. During the charging and discharging process of the battery, acquire the temperature information of preset points in the battery management system under test.

[0051] Specifically, a preset potential is pre-set on the battery management system under test (BMS). This preset potential could be a point on the BMS with significant temperature variations or multiple points with high temperature requirements. During the charging and discharging process, the temperature information at the preset points is acquired to test the BMS. Acquiring the temperature information at the preset points in the BMS facilitates a more comprehensive analysis of the BMS's performance under harsh and unpredictable temperature conditions.

[0052] The technical solution of this embodiment obtains the target current change relationship of the battery under preset operating conditions. These preset operating conditions include, for example, the battery charging and discharging within a short period, i.e., the battery charging and discharging under harsh conditions while the vehicle is running. This allows for the acquisition of the target current change relationship during charging and discharging under harsh conditions, thereby obtaining the temperature information of the battery management system under test (BMS) when the battery is operating under harsh conditions. This makes the acquired temperature information more consistent with the actual temperature of the BMS in practical applications, thus improving the accuracy of the BMS test. By inputting the target temperature change relationship into a temperature chamber, the chamber controls its internal temperature according to this relationship, ensuring that the ambient temperature of the BMS matches the actual ambient temperature of the BMS during vehicle operation in harsh environments, further improving the accuracy of the BMS test. The charging and discharging machine of the BMS test device controls the battery charging and discharging according to the target current change relationship, recreating the actual operating state of the BMS. Furthermore, the temperature acquisition device acquires the temperature information at preset points within the BMS for testing. Obtaining the temperature information at these preset points facilitates a more complete analysis of the temperature changes of the BMS under harsh conditions. The technical solution of this embodiment solves the problem of not being able to fully obtain the temperature data of the battery management system during the actual operation of the vehicle, and improves the comprehensiveness and accuracy of the temperature test of the battery management system.

[0053] Based on the above technical solution, optionally, during the charging and discharging process of the battery, the following additional steps are also included:

[0054] The threshold judgment conditions in the battery management system under test are masked so that the battery will continue to charge and discharge even when the battery temperature exceeds the temperature threshold or the battery current exceeds the current threshold.

[0055] Specifically, during normal operation, the battery management system (BMS) monitors the battery temperature and current. When the battery temperature exceeds a temperature threshold or the battery current exceeds a current threshold, it controls the battery to stop charging and discharging. By masking the threshold judgment conditions in the BMS under test, the BMS can normally detect the battery temperature and current, but without making threshold judgments for these parameters. Even when the battery temperature exceeds the temperature threshold or the battery current exceeds the current threshold, the battery continues to charge and discharge. This allows the system to obtain the preset temperature information of the BMS throughout the battery's operating process, thus achieving complete testing of the BMS.

[0056] Based on the above technical solutions, and combined with the methods for obtaining the target temperature change relationship and the target current change relationship, the battery management system testing method is refined. Figure 2 is a flowchart of another battery management system testing method provided by an embodiment of the present invention. Optionally, referring to Figure 2, the battery management system testing method includes:

[0057] S210. Obtain the initial current change relationship of the battery under preset operating conditions.

[0058] Specifically, vehicle manufacturers typically provide an initial current variation relationship under harsh operating conditions. This initial current variation relationship is, for example, the relationship between the battery current and time. After obtaining the initial current variation relationship of the battery under preset operating conditions, it can be processed to obtain the target current variation relationship.

[0059] S220. Reduce the initial current change relationship to obtain the target current change relationship.

[0060] Specifically, because the initial current change relationship differs from the current change during actual vehicle operation, the derating degree of the initial current change is determined based on the battery temperature and battery voltage information of the vehicle under preset operating conditions. The initial current change relationship is then drated according to the derating degree to obtain the target current change relationship that conforms to the actual operating conditions of the vehicle, which helps to improve the accuracy of temperature testing of the battery management system under test.

[0061] For example, Figure 3 is a partial curve diagram of the initial current change relationship and the target current change relationship provided by an embodiment of the present invention. As shown in Figure 3, the horizontal axis is time and the vertical axis is the current value. The lighter-colored curve ① is the initial current change relationship, and the darker-colored curve ② is the target current change relationship after derating. The battery is controlled to charge and discharge according to the target current change relationship, so that the working state of the battery and the battery management system under test is consistent with the actual working state during operation, thereby improving the accuracy of temperature testing of the battery management system under test.

[0062] S230. Obtain the target temperature change relationship of the environment where the battery management system under test is located during vehicle operation.

[0063] For example, Figure 4 is a graph of the target temperature change relationship provided by an embodiment of the present invention. As shown in Figure 4, the horizontal axis represents time, and the vertical axis represents temperature value. The initial temperature T1 is the highest temperature of the environment in which the vehicle is located during actual use (e.g., the highest global temperature), that is, the initial temperature when the battery management system under test starts working under harsh conditions. When the vehicle and the battery management system under test run to time t1, the temperature begins to rise. When running to time t2, the temperature rises to T2. When running to time t3, the vehicle's water cooling system starts to work and begins to cool down. When running to time t4, the temperature drops to t3 and remains unchanged. Here, temperature t1 is, for example, 47°C. Therefore, by controlling the ambient temperature of the battery management system under test through the target temperature change relationship, the temperature information of the battery management system under test actually working under harsh conditions can be obtained.

[0064] S240. Control the temperature inside the chamber according to the target temperature change relationship; wherein, the chamber is equipped with a battery and a battery management system connected to the battery.

[0065] S250: Control the battery to charge and discharge according to the target current change relationship so that the battery management system connected to the battery can enter the working state.

[0066] S260. During the charging and discharging process of the battery, acquire the temperature information of preset points in the battery management system under test.

[0067] Based on the above technical solutions, the battery management system includes multiple devices. In order to accurately test the temperature data of the battery management system, it is necessary to determine the devices for temperature acquisition, that is, to determine the preset test points. For example, devices with large temperature variations or high temperature requirements are selected as preset points. The specific preset points are described below, but this is not intended to limit the invention.

[0068] Figure 5 is a flowchart of another battery management system testing method provided by an embodiment of the present invention. Optionally, referring to Figure 5, the battery management system testing method includes:

[0069] S310. Obtain the target current change relationship of the battery under preset operating conditions; wherein, the preset operating conditions include at least the charging time and discharging time of the battery.

[0070] S320: Control the temperature inside the chamber according to the target temperature change relationship; wherein, the chamber is equipped with a battery and a battery management system connected to the battery.

[0071] S330: Control the battery to charge and discharge according to the target current change relationship so that the battery management system connected to the battery can enter the working state.

[0072] S340. During the charging and discharging process of the battery, acquire the temperature information of preset points on the printed circuit board of the battery management system under test.

[0073] Specifically, the battery management system under test (BDT) includes a printed circuit board (PCB). The components of the BDT are mounted on the PCB. When the ambient temperature of the BDT increases, the temperature of the components on the PCB also rises. Therefore, preset points are set on the PCB, such as locations of components that generate significant heat during operation or have high temperature requirements. By acquiring the temperature information of these preset points on the PCB, the BDT can be comprehensively tested, obtaining complete temperature information, which facilitates the analysis of temperature changes under harsh operating conditions.

[0074] Optionally, temperature information at preset points on the printed circuit board of the battery management system under test is obtained, including:

[0075] Acquire temperature information from the surfaces of the shunt, transistor, power chip, battery-connected ports, external power supply interfaces, voltage acquisition chips, and processor on the printed circuit board.

[0076] Specifically, shunts need to operate at high currents, which causes their surface temperature to rise due to self-heating. This surface temperature increases further, especially in high ambient temperatures and poor heat dissipation conditions. According to IEEE standards, the recommended operating current of a shunt under normal operating conditions should not exceed two-thirds of its rated current. However, in practical applications, a wider current range often needs to be measured; generally, the shunt is required to operate normally at 10%-100% of its rated current, and sometimes even experience short-term overloads. Regardless of the operating conditions, controlling the shunt's surface temperature is crucial. It operates best between 30-70°C, and its surface temperature should not exceed 145°C, otherwise, irreversible changes in the resistance of the resistive alloy will occur. Therefore, temperature testing of the battery management system under test requires collecting the surface temperature information of the shunt.

[0077] Transistors are components on the printed circuit board (PCB) of a battery management system (BMS) that generate a significant amount of heat. If the transistor's temperature exceeds its limit, it will overheat and burn out. Therefore, temperature testing of the BMS under test requires collecting the temperature information of the transistor's surface. Typically, about 30% of the heat in a transistor is located on the surface furthest from the PCB, and about 70% is located on the surface closest to the PCB. Therefore, when collecting the transistor's surface temperature, it is necessary to collect the temperature information of the surface furthest from the PCB, as well as the temperature information of the contact surface between the transistor and the PCB. Specifically, collecting the temperature information of the transistor's contact points on the PCB is used to obtain the temperature information of the contact surface between the transistor and the PCB.

[0078] The battery management system (BMS) includes a power chip, which converts the voltage output from the battery to power the BMS or other devices. The power chip can also convert the voltage input from external power sources to power the BMS. Peripheral components of the power chip typically include electrolytic capacitors. Electrolytic capacitors are extremely susceptible to temperature fluctuations, which can reduce their lifespan and affect the surface temperature of the power chip. Overheating and damage to these peripheral components can prevent the power chip from supplying power properly; therefore, it is necessary to collect the surface temperature information of the power chip.

[0079] The current at the port where the battery management system connects to the battery is relatively large, and the current at the external power supply interface where the battery management system connects to external devices is also relatively large, which will generate a lot of heat. Therefore, it is necessary to collect the temperature information at the port where the battery is connected.

[0080] The voltage acquisition chip is used to acquire the battery voltage. The voltage acquisition chip and the processor generate a lot of heat when they are running, so it is necessary to acquire the temperature information of the surface of the voltage acquisition chip and the surface of the processor.

[0081] For example, Figure 6 is a schematic diagram of a battery management system provided in an embodiment of the present invention. Optionally, referring to Figure 6, the printed circuit board of the battery management system is provided with multiple components, and preset points for collecting temperature information are selected on the printed circuit board. Preset point 1 is the surface of the shunt, preset point 2 is the surface of the transistor away from the printed circuit board, preset point 3 is the position on the printed circuit board where it contacts the transistor, preset point 4 is the external power supply interface, preset point 5 is the negative port in the port connected to the battery, preset point 6 is the positive port in the port connected to the battery, preset point 7 is the surface of the power chip that converts the voltage output by the battery, preset point 8 is the surface of the voltage acquisition chip, preset point 9 is the surface of the processor, and preset point 10 is the power chip that converts the voltage input by the external power supply device.

[0082] It should be noted that Figure 6 illustrates the preset points on the printed circuit board, but does not limit them. In other embodiments, other component surfaces that generate more heat or have higher temperature requirements can also be selected as preset points, such as the surface of a resistor with a large resistance value, the surface of a power amplifier chip, and the surface of a capacitor with a large capacitance value.

[0083] The technical solution of this invention also provides a battery management system testing device. Figure 7 is a structural schematic diagram of a battery management system testing device provided in this invention. Referring to Figure 7, the battery management system testing device includes: a data processing device 401, a temperature chamber 402, a charge / discharge machine 403, and a temperature acquisition device 404; a battery 501 and a battery management system 502 connected to the battery 501 are disposed in the temperature chamber 402; the temperature chamber 402 is used to control the internal temperature of the temperature chamber 402 according to the target temperature change relationship; the data processing device 401 is connected to the charge / discharge machine 403, and the data processing device 401 is used for... The system acquires the target current change relationship of battery 501 under preset operating conditions; wherein the preset operating conditions include at least the charging time and discharging time of battery 501; a charge / discharge machine 403 is connected to battery 501 and is used to control battery 501 to charge and discharge according to the target current change relationship, so that the battery management system 502 connected to battery 501 enters the working state; a temperature acquisition device 404 is connected to multiple preset points of the battery management system 502 and is used to acquire the temperature information of the preset points in the battery management system 502 during the charging and discharging process of battery 501.

[0084] Specifically, the data processing device 401 can acquire and process data. The data processing device 401 is, for example, a computer or host computer. The data processing device 401 acquires the target current change relationship of the battery 501 under preset operating conditions. These preset operating conditions include, for example, the battery 501 charging and discharging within a short period, i.e., the battery 501 charging and discharging under harsh conditions while the vehicle is running. This allows the acquisition of the target current change relationship of the battery 501 during charging and discharging under harsh conditions, thereby acquiring the temperature information of the battery management system 502 under test when the battery 501 is operating under harsh conditions. This makes the acquired temperature information more consistent with the actual temperature of the battery management system 502 during practical application, thus improving the accuracy of the battery management system test. The target temperature change relationship represents the ambient temperature change relationship of the battery management system (BMS) when the vehicle is operating in harsh environments. By inputting the target temperature change relationship into the temperature chamber, the temperature chamber 402 controls its internal temperature according to the target temperature change relationship, ensuring that the ambient temperature of the BMS under test (502) matches the actual ambient temperature of the BMS when the vehicle is operating in harsh environments. This further improves the accuracy of the BMS test. The charge / discharge machine 403 controls the battery 501 to charge and discharge according to the target current change relationship, replicating the actual operating state of the BMS 502. The temperature acquisition device 404 acquires the temperature information at preset points in the BMS 502 for testing. Acquiring the temperature information at preset points in the BMS 502 facilitates a more complete analysis of the temperature changes of the BMS under harsh environments.

[0085] Based on the above technical solutions, Figure 8 is a structural schematic diagram of another battery management system testing device provided by an embodiment of the present invention. Optionally, referring to Figure 8, the battery management system testing device further includes: a host computer 405; the host computer 405 is connected to the battery management system 502 under test, and the host computer 405 is used to shield the threshold judgment conditions in the battery management system 502 under test, so that when the temperature of the battery 501 exceeds the temperature threshold and the current of the battery 501 exceeds the current threshold, the battery 501 will still charge and discharge.

[0086] Specifically, during normal operation, the battery management system monitors the battery temperature and current. When the battery temperature exceeds a temperature threshold or the battery current exceeds a current threshold, it controls the battery to stop charging and discharging. The host computer 405 disables the threshold judgment conditions in the battery management system under test 502, allowing the battery management system under test 502 to normally detect the temperature and current of battery 501, but without performing threshold judgments on the current and temperature of battery 501. When the battery temperature exceeds the temperature threshold or the battery current exceeds the current threshold, battery 501 continues to charge and discharge, thereby obtaining the preset temperature information of the battery management system under test 502 during the entire working process of the battery, and achieving the integrity of the test of the battery management system under test 502.

[0087] Optionally, referring to Figure 8, the battery management system test apparatus further includes: a power supply device 406; the power supply device 406 is connected to the power supply terminal of the battery management system under test 502, and the power supply device 406 is used to supply power to the battery management system under test 502.

[0088] Specifically, the power supply device 406 provides, for example, a 12V DC voltage to power the battery management system under test 502, enabling the battery management system under test 502 to work normally. When the battery management system under test 502 is working, the temperature of the preset points of the battery management system under test 502 is collected to realize the test of the battery management system under test 502.

[0089] Optionally, the temperature acquisition device 404 includes multiple thermocouples, each thermocouple is set to correspond one-to-one with a preset point, and the thermocouples are attached to the preset points.

[0090] Specifically, thermocouples are set up one-to-one with preset points. The thermocouples can directly measure the temperature of the corresponding preset points and convert the temperature information into voltage information, thereby obtaining the temperature information of the battery management system 502 under test at the preset points, which facilitates a more complete analysis of the temperature changes of the battery management system under harsh conditions.

[0091] Based on the above technical solution, the battery management system testing device may optionally include a storage device 407; the storage device 407 is connected to the temperature acquisition device 404 and is used to store temperature information.

[0092] Specifically, the storage device 407 can store the temperature information collected by the temperature acquisition device 404, facilitating subsequent analysis of the temperature information of the battery management system 502 under test. Furthermore, the storage device 407 can also display the temperature information of the battery management system 502 under test, enabling real-time monitoring of its temperature.

[0093] Optionally, storage device 407 includes a recorder.

[0094] Specifically, a recorder is an instrument that converts the process of one or more variables changing over time or another variable into a recognizable and readable signal, and can save the recorded signal changes for analysis and processing. Furthermore, the recorder can display the temperature information acquired by the temperature acquisition device 404.

[0095] Optionally, continuing to refer to Figure 4, the battery management system test apparatus also includes a communication device 408; the storage device 407 is connected to the terminal through the communication device 408.

[0096] Specifically, the terminal is a host computer or a computer, and the storage device 407 is connected to the terminal through the communication device 408, so that the storage device 407 sends the temperature information of the battery management system under test 502 stored in it to the terminal, so that the terminal can display and analyze the temperature information of the battery management system under test 502.

[0097] Optionally, referring to Figure 4, the system also includes an operating parameter information acquisition device 409; the operating parameter information acquisition device 408 is connected to the processor of the battery management system under test 502, and the operating parameter information acquisition device 409 is used to acquire the operating parameter information of the processor of the battery management system under test 502; wherein, the operating parameter information includes at least operating current information and operating voltage information.

[0098] Specifically, the operating parameter information acquisition device 409 includes, for example, a voltage acquisition device or a current acquisition device, which can acquire the operating current information and operating voltage information of the processor of the battery management system under test 502, so as to facilitate the monitoring of the operating status of the processor of the battery management system under test 502, thereby monitoring the operating status of the battery management system under test 502 and timely knowing whether the operating status of the battery management system under test 502 is normal.

[0099] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0100] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A battery management system testing method, characterized in that, include: The method involves: acquiring the target current change relationship of the battery under preset operating conditions; wherein the preset operating conditions include at least the charging and discharging time of the battery; controlling the temperature inside the temperature chamber according to the target temperature change relationship; wherein the temperature chamber contains the battery and a battery management system (BMS) connected to the battery; wherein, before controlling the ambient temperature of the temperature chamber according to the target temperature change relationship, the method further includes: acquiring the target temperature change relationship of the environment where the BMS is located during vehicle operation; wherein the target temperature change relationship is the ambient temperature change relationship of the BMS when the vehicle is operating in a harsh environment; controlling the battery to charge and discharge according to the target current change relationship, so that the BMS connected to the battery enters a working state; acquiring temperature information of preset points in the BMS during the charging and discharging process of the battery; and further including: shielding the threshold judgment conditions in the BMS so that the battery continues to charge and discharge even when the battery temperature exceeds a temperature threshold or the battery current exceeds a current threshold.

2. The method according to claim 1, characterized in that, The step of obtaining the target current change relationship of the battery under preset operating conditions includes: obtaining the initial current change relationship of the battery under the preset operating conditions; and derating the initial current change relationship to obtain the target current change relationship.

3. The method according to any one of claims 1-2, characterized in that, The step of obtaining temperature information at preset points in the battery management system under test includes: obtaining temperature information at preset points on the printed circuit board of the battery management system under test.

4. The method according to claim 3, characterized in that, The step of acquiring temperature information at preset points on the printed circuit board of the battery management system under test includes: acquiring temperature information of the shunt surface, transistor surface, power chip surface, port connected to the battery, external power supply interface, voltage acquisition chip surface and processor surface on the printed circuit board.

5. A battery management system testing device, characterized in that, include: Data processing equipment, incubators, charge / discharge machines, and temperature acquisition equipment; The chamber is equipped with a battery and a battery management system connected to the battery. The temperature chamber is used to control the internal temperature of the temperature chamber according to a target temperature change relationship; the data processing device is connected to the charge / discharge machine, and the data processing device is used to acquire the target current change relationship of the battery under preset operating conditions; wherein, the preset operating conditions include at least the charging time and discharging time of the battery; the charge / discharge machine is connected to the battery, and the charge / discharge machine is used to control the battery to charge and discharge according to the target current change relationship, so that the battery management system under test connected to the battery enters the working state; the temperature acquisition device is connected to multiple preset points of the battery management system under test, and the temperature acquisition device is used to acquire the temperature information of the preset points of the battery management system under test during the charging and discharging process of the battery; wherein, before controlling the ambient temperature of the temperature chamber according to the target temperature change relationship, the method further includes: acquiring the target temperature change relationship of the environment where the battery management system under test is located during vehicle operation; wherein, the target temperature change relationship is the ambient temperature change relationship of the battery management system when the vehicle is running in a harsh environment; during the charging and discharging process of the battery, the method further includes: shielding the threshold judgment conditions in the battery management system under test, so that the battery continues to charge and discharge even when the battery temperature exceeds the temperature threshold and the battery current exceeds the current threshold.

6. The battery management system testing apparatus according to claim 5, characterized in that, Also includes: Host computer; The host computer is connected to the battery management system under test. The host computer is used to shield the threshold judgment conditions in the battery management system under test so that the battery will still charge and discharge when the battery temperature exceeds the temperature threshold or the battery current exceeds the current threshold.

7. The battery management system testing apparatus according to claim 5, characterized in that, Also includes: A power supply device; the power supply device is connected to the power supply terminal of the battery management system under test, and the power supply device is used to supply power to the battery management system under test.

8. The battery management system testing apparatus according to claim 5, characterized in that, The temperature acquisition device includes multiple thermocouples, each of which is set up in a one-to-one correspondence with a preset point, and the thermocouples are attached to the preset point.

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