Battery pack detection system, control method, and readable storage medium

Abstract

This invention discloses a battery pack detection system, control method, and readable storage medium. Power can be drawn directly from the battery pack output via a BUCK power supply, directly powering the high-voltage detection system without needing to draw power from the control box, thus simplifying the power supply mechanism. Simultaneously, the operating status detection unit continuously monitors the battery pack's operating current and voltage, allowing for proactive control of the fuse control module to trip the fuse in case of current or voltage anomalies, ensuring vehicle safety. Furthermore, this invention utilizes a core controller to independently detect various signals collected by the operating status detection unit and control the fuse control module, eliminating the need for a main control box for auxiliary detection. The main control box only needs to interact with the battery pack detection system to acquire detection signals, effectively reducing the number of external wiring harnesses and simplifying wiring connections.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicles, and in particular to a battery pack detection system, control method, and readable storage medium. Background Technology

[0002] With the development of science and technology and the economy, new energy vehicle technology has made significant progress, and new energy vehicles are gradually entering more and more homes. The battery pack is an essential component of new energy vehicles, and its quality significantly affects the driving experience. Furthermore, the battery pack requires effective management by the battery energy management unit to ensure its normal and safe operation.

[0003] Currently, various detection functions in the battery energy management unit (BEM) require control of the high-voltage board via the BEM's main control box. However, current high-voltage boards require a separate isolated power supply from the main control box, making the overall power supply structure complex. Furthermore, existing high-voltage boards lack the ability to actively implement safety protection, making it difficult to effectively guarantee vehicle safety. In addition, because the main control box needs to control the high-voltage board to perform detection functions, it requires a large number of external wiring harnesses, increasing the difficulty of assembly and debugging, as well as troubleshooting later. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a battery pack detection system that solves the problems of requiring a separate power supply from the main control box and the inability to actively perform safety actions, and effectively simplifies the wiring connections.

[0005] The present invention also provides a control method for a battery pack detection system and a computer-readable storage medium for performing the control method for the battery pack detection system described above.

[0006] A battery pack testing system according to a first aspect of the present invention includes:

[0007] A BUCK power supply, wherein the input terminal of the BUCK power supply is connected to the output terminal of the battery pack;

[0008] The operating status detection unit is used to detect the operating current and operating voltage of the battery pack;

[0009] The fuse control module has a fuse control terminal, a fuse input terminal, and a fuse output terminal. The fuse input terminal is connected to the output terminal of the BUCK power supply, the fuse output terminal is used to connect to the ground wire, and the fuse control module is used to adjust the working state of the fuse.

[0010] The core controller is connected to the operating status detection unit and the fuse control terminal, respectively.

[0011] The communication module is connected to the core controller.

[0012] The battery pack testing system according to embodiments of the present invention has at least the following beneficial effects:

[0013] The BUCK power supply allows direct power to be drawn from the battery pack's output, directly powering the high-voltage detection system without needing to draw power from the control box, thus simplifying the power supply mechanism. Simultaneously, the operating status detection unit continuously monitors the battery pack's operating current and voltage. This allows for proactive control of the fuse control module to activate the fuse and trip in case of current or voltage anomalies, ensuring vehicle safety. Furthermore, the core controller in this embodiment of the battery pack detection system independently detects various signals collected by the operating status detection unit and controls the fuse control module. This eliminates the need for a main control box for detection; the main control box only needs to interact with the battery pack detection system to acquire detection signals, effectively reducing the number of external wiring harnesses and simplifying wiring connections.

[0014] According to some embodiments of the present invention, the fuse control module includes:

[0015] A switching circuit has a switch input terminal, a switch output terminal, and a first controlled terminal. The first controlled terminal is connected to the core controller, and the switch input terminal is connected to the output terminal of the BUCK power supply.

[0016] The high-side drive module has a high-side input terminal, a high-side output terminal, and a second controlled terminal. The second controlled terminal is connected to the core controller. The high-side input terminal is connected to the switch output terminal. The high-side output terminal is connected to one end of the coil of the fuse. A first resistor is connected between the high-side input terminal and the high-side output terminal.

[0017] The second resistor is connected between the high-side input terminal and the output terminal of the BUCK power supply.

[0018] The low-side drive module has a low-side input terminal, a low-side output terminal, and a third controlled terminal. The third controlled terminal is connected to the core controller. The low-side input terminal is connected to the other end of the fuse coil. The low-side output terminal is connected to the ground wire. A third resistor is connected between the low-side input terminal and the low-side output terminal. The low-side input terminal is used to output a voltage sampling value to the core controller.

[0019] According to some embodiments of the present invention, the switching circuit includes:

[0020] The MOS transistor has its source connected to the output terminal of the BUCK power supply, its drain connected to the high-side input terminal, and a fourth resistor connected between its gate and source.

[0021] A transistor is connected to a fifth resistor between its collector and the gate of the MOSFET. The collector is connected to ground. A capacitor is connected between the collector and the output terminal of the BUCK power supply. The base is connected to the core controller.

[0022] According to some embodiments of the present invention, the operating status detection unit includes:

[0023] A current detection module, connected to the core controller, is used to detect the operating current of the battery pack;

[0024] The total voltage insulation detection module is connected to the core controller and is used to detect the operating voltage and operating insulation of the battery pack.

[0025] According to some embodiments of the present invention, the operating status detection unit further includes a temperature detection module connected to the core controller.

[0026] According to some embodiments of the present invention, the grounding terminal of the temperature detection module is connected at the same potential as the negative terminal of the battery pack.

[0027] A control method for a battery pack testing system according to a second aspect of the present invention, applied to the aforementioned battery pack testing system, the control method comprising:

[0028] Acquire operating status data, which includes at least the operating current and operating voltage of the battery pack collected by the operating status detection unit;

[0029] If the operating status data indicates a fault in the battery pack, the fuse control module is controlled to drive the fuse to blow, thereby stopping the battery pack from outputting power.

[0030] The control method of the battery pack detection system according to embodiments of the present invention has at least the following beneficial effects:

[0031] By real-time monitoring of the battery pack's operating current and voltage, the system can proactively control the fuse control module to trip the fuse when a battery pack malfunctions, disconnecting the battery pack's output and ensuring the safety of the vehicle and its occupants. Furthermore, the control method of the battery pack detection system in this embodiment is based on the aforementioned battery pack detection system, thus achieving the beneficial effects of such a system.

[0032] According to some embodiments of the present invention, the control method further includes:

[0033] If the operating status data indicates that the battery pack is in normal condition, the fuse control module is controlled to perform a self-test to obtain fault detection information of the fuse control module.

[0034] According to some embodiments of the present invention, the fuse control module includes a switching circuit, a high-side drive module, a second resistor, and a low-side drive module; the switching circuit has a switch input terminal, a switch output terminal, and a first controlled terminal, the first controlled terminal being connected to the core controller, and the switch input terminal being connected to the output terminal of the BUCK power supply; the high-side drive module has a high-side input terminal, a high-side output terminal, and a second controlled terminal, the second controlled terminal being connected to the core controller, the high-side input terminal being connected to the switch output terminal, the high-side output terminal being connected to one end of the fuse coil, and a first resistor being connected between the high-side input terminal and the high-side output terminal; the second resistor is connected between the high-side input terminal and the output terminal of the BUCK power supply; the low-side drive module has a low-side input terminal, a low-side output terminal, and a third controlled terminal, the third controlled terminal being connected to the core controller, the low-side input terminal being connected to the other end of the fuse coil, the low-side output terminal being connected to ground, and a third resistor being connected between the low-side input terminal and the low-side output terminal;

[0035] The self-test of the fuse control module includes:

[0036] The switching circuit, high-side drive module, and low-side drive module are disconnected, and the first voltage sample value output from the low-side input terminal is obtained.

[0037] The switch circuit is closed, the high-side drive module and the low-side drive module are disconnected, and the second voltage sample value output from the low-side input terminal is obtained.

[0038] The high-side driving module is closed, and the switching circuit and the low-side driving module are disconnected to obtain the third voltage sample value output from the low-side input terminal.

[0039] Control the low-side driving module to close, control the switching circuit and the high-side driving module to disconnect, and obtain the fourth voltage sample value output from the low-side input terminal;

[0040] The fault detection information is determined based on the first voltage sample value, the second voltage sample value, the third voltage sample value, and the fourth voltage sample value.

[0041] According to a third aspect embodiment of the present invention, a computer-readable storage medium stores computer-executable instructions for performing a control method for a battery pack detection system as described in the second aspect embodiment. Since the computer-readable storage medium employs all the technical solutions of the control method for the battery pack detection system of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0042] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0043] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0044] Figure 1 This is a system diagram of a battery pack detection system according to an embodiment of the present invention;

[0045] Figure 2 This is a flowchart of a control method for a battery pack detection system according to an embodiment of the present invention;

[0046] Figure 3 This is a self-test flowchart of a fuse control module according to an embodiment of the present invention.

[0047] Figure label:

[0048] BUCK power supply 100

[0049] Fuse control module 200, switching circuit 210, high-side drive module 220, low-side drive module 230

[0050] Core controller 300

[0051] Communication module 400

[0052] Current detection module 510, total voltage insulation detection module 520, temperature detection module 530,

[0053] Battery pack 610, fuse 620. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0055] In the description of this invention, the use of terms such as "first," "second," etc., is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0056] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0058] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0059] See Figure 1 As shown, Figure 1 This is a system diagram of a battery pack testing system according to an embodiment of the present invention. The battery pack testing system includes a BUCK power supply 100, an operating status detection unit, a fuse control module 200, a core controller 300, and a communication module 400.

[0060] BUCK power supply 100, the input terminal of BUCK power supply 100 is connected to the output terminal of battery pack 610;

[0061] The operating status detection unit is used to detect the operating current and operating voltage of the battery pack 610;

[0062] The fuse control module 200 has a fuse control terminal, a fuse input terminal, and a fuse output terminal. The fuse input terminal is connected to the output terminal of the BUCK power supply 100, and the fuse output terminal is used to connect to the ground wire. The fuse control module 200 is used to adjust the working state of the fuse 620.

[0063] The core controller 300 is connected to the operation status detection unit and the fuse control terminal, respectively.

[0064] The communication module 400 is connected to the core controller 300.

[0065] like Figure 1As shown, the positive and negative input terminals of the BUCK power supply 100 are directly connected to the positive and negative terminals of the battery pack 610, allowing direct power draw from the battery pack 610. Furthermore, due to the inherent power characteristics of the BUCK power supply 100, the higher output voltage of the battery pack 610 can be reduced to the lower operating voltage required by the control and detection components of the entire battery pack detection system. The operating status detection unit consists of multiple sensors or monitoring circuits, effectively detecting the operating current and voltage, and transmitting the results to the core controller 300. After acquiring this data, the core controller 300 transmits it to the main controller in the main control box via the communication module 400, simplifying the connection of the main control box. Simultaneously, after receiving the operating current and voltage data of the battery pack 610, if the current or voltage is abnormal, the core controller 300 can directly control the fuse control module 200 to drive the coil of the fuse 620, causing the fuse 620 to blow and disconnecting the output of the battery pack 610.

[0066] The battery pack detection system of this embodiment can directly draw power from the output terminal of the battery pack 610 via the BUCK power supply 100, thereby directly powering the high-voltage detection system and eliminating the need to draw power from the control box, simplifying the power supply mechanism. Simultaneously, the operating status detection unit can continuously monitor the operating current and voltage of the battery pack 610, thus actively controlling the fuse control module 200 to drive the fuse 620 to blow when abnormal current or voltage occurs, ensuring vehicle safety. Furthermore, the core controller 300 used in the battery pack detection system of this embodiment independently detects various signals collected by the operating status detection unit and controls the fuse control module 200, eliminating the need for the main control box for detection. The main control box only needs to interact with the battery pack detection system to obtain detection signals, effectively reducing the number of external wiring harnesses and simplifying wiring connections. At the same time, because the core controller 300 is used for detection, the computational resources occupied by the battery management unit are also reduced.

[0067] In some embodiments, the fuse control module 200 includes a switching circuit 210, a high-side driving module 220, a low-side driving module 230, and a first resistor R2.

[0068] The switching circuit 210 has a switch input terminal, a switch output terminal and a first controlled terminal. The first controlled terminal is connected to the core controller 300, and the switch input terminal is connected to the output terminal of the BUCK power supply 100.

[0069] The high-side drive module 220 has a high-side input terminal, a high-side output terminal, and a second controlled terminal. The second controlled terminal is connected to the core controller 300, the high-side input terminal is connected to the switch output terminal, the high-side output terminal is connected to one end of the coil of the fuse 620, and a first resistor R3 is connected between the high-side input terminal and the high-side output terminal.

[0070] The first resistor R2 is connected between the high-side input terminal and the output terminal of the BUCK power supply 100;

[0071] The low-side drive module 230 has a low-side input terminal, a low-side output terminal, and a third controlled terminal. The third controlled terminal is connected to the core controller 300. The low-side input terminal is connected to the other end of the coil of the fuse 620. The low-side output terminal is connected to the ground wire. A third resistor R4 is connected between the low-side input terminal and the low-side output terminal. The low-side input terminal is used to output the voltage sampling value to the core controller 300.

[0072] refer to Figure 1 When the coil of fuse 620 needs to be driven, the switching circuit 210, the high-side drive module 220 and the low-side drive module 230 are usually turned on at the same time. This allows the coil current through fuse 620 to exceed the threshold value, causing the coil to start the fuse operation, which causes the fuse 620 main circuit to blow and disconnects the output of battery pack 610.

[0073] When fuse 620 is not required to blow, a self-test can be performed to continuously monitor the functional status of the switching circuit 210, high-side drive module 220, and low-side drive module 230 in the fuse control module 200. This prevents a malfunction in the fuse control module 200 from being discovered only when fuse blowing is needed, which could lead to the inability to disconnect the battery pack 610 output and cause a safety accident. It should be noted that fuse 620 will only blow when the current through its coil exceeds a threshold value. Therefore, as long as the current through fuse 620 is controlled to not exceed the threshold value, it can be ensured that the fuse will not be triggered. This principle allows the fuse control module 200 to perform a self-test. By setting the first resistor R3, the first resistor R2 and the third resistor R4, after the switch circuit 210, the high-side drive module 220 and the low-side drive module 230 are turned on respectively, the low-side input terminal of the low-side drive module 230 outputs different voltage values, thereby enabling the detection of the switch circuit 210, the high-side drive module 220 and the low-side drive module 230 respectively.

[0074] In some embodiments, the switching circuit 210 includes a MOSFET Q1 and a transistor Q2.

[0075] MOSFET Q1 has its source connected to the output of BUCK power supply 100, its drain connected to the high-side input, and a fourth resistor R5 connected between its gate and source.

[0076] Transistor Q2 has a fifth resistor R6 connected between its collector and the gate of MOSFET Q1. Its collector is connected to ground, and capacitor C1 is connected between its collector and the output of BUCK power supply 100. Its base is connected to the core controller 300.

[0077] like Figure 1 As shown, the switching of transistor Q2 is controlled by the core controller 300. The core controller 300 controls the switching of MOSFET Q1 by controlling the switching of transistor Q2. Then, the switching of MOSFET Q1, high-side drive module 220 and low-side drive module 230 can be used to complete the fuse control of fuse 620 and the self-test of fuse control module 200.

[0078] In some embodiments, the operating status detection unit includes: a current detection module 510 and a total voltage insulation detection module 520. The current detection module 510 is connected to the core controller 300 and is used to detect the operating current of the battery pack 610.

[0079] The total voltage insulation detection module 520 is connected to the core controller 300 and is used to detect the working voltage and working insulation of the battery pack 610.

[0080] The current detection module 510 and the total voltage insulation detection module 520 can detect the working current, working voltage and working insulation of the battery pack 610, thereby actively triggering protection actions when the current is too high, the voltage is too high or the insulation is too low, reducing the disasters caused by faults.

[0081] like Figure 1 As shown, the current detection module 510 includes a sixth resistor R7 and an operational amplifier unit U1. The sixth resistor R7 is connected in series in the power supply circuit of the battery pack 610, thereby converting the working current signal of the battery pack 610 into a voltage signal. The voltage signal is processed by the operational amplifier unit U1 and then input to the core controller 300 to complete the current detection.

[0082] like Figure 1 As shown, the total voltage insulation detection module 520 mainly uses multiple monitoring points set up throughout the main circuit. By detecting and analyzing these monitoring points, the operating voltage and insulation can be directly and effectively determined. It should be noted that the total voltage insulation detection module 520 can also use specialized voltage sensors and insulation detection devices to perform voltage and insulation detection.

[0083] In some embodiments, the operating status detection unit further includes a temperature detection module 530 connected to the core controller 300. The temperature detection unit can detect the temperature of components such as the battery pack 610, connectors, and contactors throughout the battery system, thereby enabling timely cooling measures to prevent accidents in case of abnormal temperatures.

[0084] In some embodiments, the ground terminal of the temperature detection module 530 is connected at the same potential as the negative terminal of the battery pack 610. This method of connecting the negative terminals at the same potential reduces the voltage withstand requirements of temperature sensors when detecting high-voltage components such as copper busbars and relays, effectively lowering the cost associated with sensor selection.

[0085] In some embodiments, the communication module 400 adopts a daisy-chain communication module, which can be connected to any node in the daisy chain of the entire battery management unit system to achieve communication. At the same time, it can automatically enter a sleep state when there is no daisy signal to reduce power consumption.

[0086] In some embodiments, the core controller 300 may be a chip with an ADC interface, which can directly receive signals collected by the operating status detection unit, or it may be replaced by a combination of a chip without an ADC interface and an ADC module.

[0087] In some embodiments, the high-side drive module 220 and the bottom-side drive module are drive circuits built based on MOSFETs, thereby enabling on / off control and driving. In some embodiments, the high-side drive module 220 and the bottom-side drive module may also be replaced by MOSFETs and transistors.

[0088] See Figure 2 As shown, Figure 2 This is a flowchart of a control method for a battery pack testing system according to an embodiment of the present invention. Applied to the aforementioned battery pack testing system, the control method includes, but is not limited to, steps S100 to S200.

[0089] Step S100: Obtain operating status data, which includes at least the operating current and operating voltage of the battery pack 610 collected by the operating status detection unit;

[0090] In step S200, if the operating status data indicates a fault in the battery pack 610, the control fuse control module 200 drives the fuse 620 to blow, so that the battery pack 610 stops outputting power.

[0091] The operating status data is collected by the operating status detection unit and can directly and effectively reflect the operating status of the battery pack 610. After receiving the operating status data, the core controller 300 can use the operating status data to directly and effectively determine whether the battery pack 610 has a fault. Once a fault occurs, it can control the fuse control module 200 to drive the fuse 620 to complete the fuse breaking, disconnect the battery pack 610 from the outside output, and prevent the actual occurrence of the fault.

[0092] The battery pack detection system of this invention monitors the operating status data of the battery pack 610, such as its operating current and operating voltage, in real time. Therefore, when a fault occurs in the battery pack 610, the system actively controls the fuse control module 200 to drive the fuse 620 to blow, disconnecting the output of the battery pack 610 and thus ensuring the safety of the vehicle and personnel. Furthermore, the control method of the battery pack detection system of this invention is based on the aforementioned battery pack detection system, thereby possessing the beneficial effects brought by the battery pack detection system.

[0093] In some embodiments, the control method further includes, but is not limited to, the following steps:

[0094] If the operating status data indicates that the battery pack 610 is in normal condition, the control fuse control module 200 will perform a self-test to obtain fault detection information of the fuse control module 200.

[0095] When the battery pack 610 is in a normal state, it is not necessary to drive the fuse 620 to blow. However, in order to ensure that the fuse 620 is always available, the fuse control module 200 will continuously perform self-checks and obtain corresponding fault detection information. Based on the fault detection information, it can be determined whether the fuse control module 200 has malfunctioned. When a fault is confirmed, the fault signal can be sent to the battery management unit through the communication module 400. The battery management unit will then notify the vehicle user to avoid driving a malfunctioning vehicle on the road.

[0096] In some embodiments, reference Figure 1The fuse control module 200 includes a switch circuit 210, a high-side drive module 220, a first resistor R2, and a low-side drive module 230. The switch circuit 210 has a switch input terminal, a switch output terminal, and a first controlled terminal. The first controlled terminal is connected to the core controller 300, and the switch input terminal is connected to the output terminal of the BUCK power supply 100. The high-side drive module 220 has a high-side input terminal, a high-side output terminal, and a second controlled terminal. The second controlled terminal is connected to the core controller 300, and the high-side input terminal is connected to the switch output terminal. The output terminal is connected to one end of the coil of fuse 620. A first resistor R3 is connected between the high-side input terminal and the high-side output terminal. The first resistor R2 is connected between the high-side input terminal and the output terminal of BUCK power supply 100. The low-side drive module 230 has a low-side input terminal, a low-side output terminal and a third controlled terminal. The third controlled terminal is connected to the core controller 300. The low-side input terminal is connected to the other end of the coil of fuse 620. The low-side output terminal is connected to the ground wire. A third resistor R4 is connected between the low-side input terminal and the low-side output terminal.

[0097] refer to Figure 3 The control module 200 performs a self-test, including but not limited to steps S310 to S350.

[0098] In step S310, the control switch circuit 210, the high-side drive module 220, and the low-side drive module 230 are disconnected, and the first voltage sample value output from the low-side input terminal is obtained.

[0099] In step S320, control the switch circuit 210 to close, control the high-side drive module 220 and the low-side drive module 230 to open, and obtain the second voltage sample value output from the low-side input terminal;

[0100] In step S330, the high-side drive module 220 is closed, and the switch circuit 210 and the low-side drive module 230 are disconnected to obtain the third voltage sample value output from the low-side input terminal.

[0101] In step S340, control the low-side drive module 230 to close, control the switch circuit 210 and the high-side drive module 220 to open, and obtain the fourth voltage sample value output from the low-side input terminal.

[0102] Step S350: Determine fault detection information based on the first voltage sample value, the second voltage sample value, the third voltage sample value, and the fourth voltage sample value.

[0103] The function of the fuse control module 200 is mainly based on the switching circuit 210, the high-side drive module 220, and the low-side drive module 230. Therefore, it is only necessary to determine whether the switching circuit 210, the high-side drive module 220, the low-side drive module 230, and the coil of the fuse 620 are in normal condition to determine whether the fuse control module 200 can work normally. Here is a brief description of how the fuse control module 200 performs self-testing. The resistance of the fuse 620 coil is different when it is in normal condition and when it is in abnormal condition. Furthermore, after the switching circuit 210, the high-side drive module 220, and the low-side drive module 230 are connected respectively, the connection of the first resistor R3, the first resistor R2, the third resistor R4, and the coil are also different. This will cause the voltage output at the low-side input terminal of the low-side drive module 230 to change. Using this principle, it is possible to effectively determine whether the switching circuit 210, the high-side drive module 220, the low-side drive module 230, and the coil of the fuse 620 have malfunctioned.

[0104] When a self-test is required, step S310 is executed first, closing the control switch circuit 210, the high-side drive module 220, and the low-side drive module 230. At this time, the first resistor R3, the first resistor R2, the third resistor R4, and the coil are all connected in series. Since the first resistors R3, R2, and R4 are constant, any abnormality in the coil will cause a change in its resistance, resulting in a change in the voltage across the third resistor R4. Conversely, if the coil is functioning normally, the voltage across the third resistor R4 will remain constant, thus determining whether a coil abnormality has occurred. After step S310 is completed, the first voltage sampling value is obtained.

[0105] After the coil detection is completed, step S320 is executed. At this point, only the first resistor R2, the third resistor R4, and the coil are connected in series. If the switching circuit 210 fails to turn off, the series structure consisting of the first resistor R2, the third resistor R4, and the coil cannot be obtained. Therefore, the voltage across the third resistor R4 will inevitably be different in the two cases of successful and failed shutdown, thus determining whether there is a fault in the switching circuit 210. After step S320 is completed, the second voltage sampling value is obtained.

[0106] Similarly, during step S330, only the first resistor R3, the third resistor R4, and the coil are connected in series. If the turn-off fails, the series structure formed by the first resistor R3, the third resistor R4, and the coil cannot be obtained. Therefore, the voltage across the third resistor R4 will inevitably be different in the two cases of successful and failed turn-off, thus determining whether the high-side drive module 220 is faulty. After step S330 is completed, the third voltage sampling value will be obtained.

[0107] Similarly, during step S340, the third resistor R4 is directly short-circuited. At this time, the voltage detected by the core controller 300 is zero. If the shutdown fails, the third resistor R4 will not be short-circuited. Therefore, the voltage across the third resistor R4 will be different in the two cases of successful and failed shutdown, thus determining whether the low-side drive module 230 is faulty. After step S340 is completed, the fourth voltage sampling value will be obtained.

[0108] Finally, by using the first voltage sample value, the second voltage sample value, the third voltage sample value, and the fourth voltage sample value, it can be determined whether the battery pack 610 has malfunctioned, and corresponding fault detection information is generated. The core controller 300 can then complete subsequent control based on the fault detection information.

[0109] It should be noted that if the fuse 620 coil malfunctions during the operation of the switching circuit 210, the high-side drive module 220, and the low-side drive module 230, the corresponding voltage sampling value will also change. Therefore, in principle, coil detection can be completed using any of the steps from S310 to S340.

[0110] It should also be noted that if the fault detection information indicates a fault, the fuse 620 can be blown by controlling the switch circuit 210, the high-side drive module 220, and the low-side drive module 230 to all close.

[0111] In some embodiments, reference Figure 1 The switching circuit 210 includes a MOSFET Q1 and a transistor Q2;

[0112] MOSFET Q1 has its source connected to the output of BUCK power supply 100, its drain connected to the high-side input, and a fourth resistor R5 connected between its gate and source.

[0113] Transistor Q2 has a fifth resistor R6 connected between its collector and the gate of MOSFET Q1. Its collector is connected to ground, and capacitor C1 is connected between its collector and the output of BUCK power supply 100. Its base is connected to the core controller 300.

[0114] By controlling the on / off state of transistor Q2, the on / off state of MOSFET Q1 can be controlled. At this time, the source of MOSFET Q1 is used as the switch input terminal of switch circuit 210, and the source is used as the switch output terminal. The base of transistor Q2 is used as the first controlled terminal. Thus, it can work with high-side drive module 220 and low-side drive module 230 to drive fuse 620 and complete the detection work of fuse control module 200 itself.

[0115] Furthermore, one embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, causing the processor to perform the control method of the battery pack detection system in the above embodiment.

[0116] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include computer storage media or non-transitory media and communication media or transient media. As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc DVD or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0117] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A battery pack testing system, characterized in that, include: A BUCK power supply, wherein the input terminal of the BUCK power supply is connected to the output terminal of the battery pack; The operating status detection unit is used to detect the operating current and operating voltage of the battery pack; The fuse control module has a fuse control terminal, a fuse input terminal, and a fuse output terminal. The fuse input terminal is connected to the output terminal of the BUCK power supply, the fuse output terminal is used to connect to the ground wire, and the fuse control module is used to adjust the working state of the fuse. The core controller is connected to the operating status detection unit and the fuse control terminal, respectively. The communication module is connected to the core controller; The fuse control module includes: A switching circuit has a switch input terminal, a switch output terminal, and a first controlled terminal. The first controlled terminal is connected to the core controller, and the switch input terminal is connected to the output terminal of the BUCK power supply. The high-side drive module has a high-side input terminal, a high-side output terminal, and a second controlled terminal. The second controlled terminal is connected to the core controller. The high-side input terminal is connected to the switch output terminal. The high-side output terminal is connected to one end of the coil of the fuse. A first resistor is connected between the high-side input terminal and the high-side output terminal. The second resistor is connected between the high-side input terminal and the output terminal of the BUCK power supply. The low-side drive module has a low-side input terminal, a low-side output terminal, and a third controlled terminal. The third controlled terminal is connected to the core controller. The low-side input terminal is connected to the other end of the fuse coil. The low-side output terminal is connected to the ground wire. A third resistor is connected between the low-side input terminal and the low-side output terminal. The low-side input terminal is used to output a voltage sampling value to the core controller. The switching circuit includes: The MOS transistor has its source connected to the output terminal of the BUCK power supply, its drain connected to the high-side input terminal, and a fourth resistor connected between its gate and source. A transistor is connected to a fifth resistor between its collector and the gate of the MOS transistor. The collector is connected to ground. A capacitor is connected between the collector and the output terminal of the BUCK power supply. The base is connected to the core controller. The operation status detection unit includes: A current detection module, connected to the core controller, is used to detect the operating current of the battery pack; The total voltage insulation detection module is connected to the core controller and is used to detect the operating voltage and operating insulation of the battery pack.

2. The battery pack testing system according to claim 1, characterized in that, The operating status detection unit also includes a temperature detection module connected to the core controller.

3. The battery pack testing system according to claim 2, characterized in that, The grounding terminal of the temperature detection module is connected at the same potential as the negative terminal of the battery pack.

4. A control method for a battery pack detection system, applied to the battery pack detection system according to any one of claims 1 to 3, characterized in that, The control method includes: Acquire operating status data, which includes at least the operating current and operating voltage of the battery pack collected by the operating status detection unit; If the operating status data indicates a fault in the battery pack, the fuse control module is controlled to drive the fuse to blow, thereby stopping the battery pack from outputting power.

5. The control method for the battery pack detection system according to claim 4, characterized in that, The control method further includes: If the operating status data indicates that the battery pack is in normal condition, the fuse control module is controlled to perform a self-test to obtain fault detection information of the fuse control module.

6. The control method for the battery pack detection system according to claim 5, characterized in that, The fuse control module includes a switching circuit, a high-side drive module, a second resistor, and a low-side drive module; the switching circuit has a switch input terminal, a switch output terminal, and a first controlled terminal, the first controlled terminal being connected to the core controller, and the switch input terminal being connected to the output terminal of the BUCK power supply; The high-side drive module has a high-side input terminal, a high-side output terminal, and a second controlled terminal. The second controlled terminal is connected to the core controller. The high-side input terminal is connected to the switch output terminal. The high-side output terminal is connected to one end of the fuse coil. A first resistor is connected between the high-side input terminal and the high-side output terminal. The second resistor is connected between the high-side input terminal and the output terminal of the BUCK power supply. The low-side drive module has a low-side input terminal, a low-side output terminal, and a third controlled terminal. The third controlled terminal is connected to the core controller. The low-side input terminal is connected to the other end of the fuse coil. The low-side output terminal is connected to ground. A third resistor is connected between the low-side input terminal and the low-side output terminal. The self-test of the fuse control module includes: The switching circuit, high-side drive module, and low-side drive module are disconnected, and the first voltage sample value output from the low-side input terminal is obtained. The switch circuit is closed, the high-side drive module and the low-side drive module are disconnected, and the second voltage sample value output from the low-side input terminal is obtained. The high-side driving module is closed, and the switching circuit and the low-side driving module are disconnected to obtain the third voltage sample value output from the low-side input terminal. Control the low-side driving module to close, control the switching circuit and the high-side driving module to disconnect, and obtain the fourth voltage sample value output from the low-side input terminal; The fault detection information is determined based on the first voltage sample value, the second voltage sample value, the third voltage sample value, and the fourth voltage sample value.

7. A computer-readable storage medium storing computer-executable instructions, characterized in that, The computer-executable instructions are used to execute the control method of the battery pack detection system as described in any one of claims 4 to 6.

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