Control method and device of vehicle battery pack circuit, medium and electronic equipment

Abstract

The invention discloses a control method and device for a vehicle battery pack circuit, a medium and electronic equipment, and the method comprises the steps: obtaining the periodic current of the battery pack circuit of a target vehicle in a current detection period, the periodic current comprises battery pack current corresponding to each time point of the battery pack circuit in the current detection period; determining a target short-circuit state of the battery pack circuit and target duration of the target short-circuit state based on the periodic current; a target control strategy is generated based on the target short circuit state and the target duration, and the target control strategy is used for adjusting the circuit state of the battery pack circuit through a target element; and controlling the target element to execute the target control strategy. According to the technical scheme provided by the invention, the safety of the vehicle battery pack circuit can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of vehicle battery packs, and in particular relates to a control method, device, medium and electronic equipment for a vehicle battery pack circuit. Background Art

[0002] With the rapid adoption of new energy vehicles (especially pure electric vehicles), lithium-ion batteries, as the mainstream power source, are facing increasingly prominent safety issues. Due to collision accidents, insulation failure, design flaws, and other factors, external short circuits in battery packs can occur. This occurs when a conductor directly connects the positive and negative electrodes outside the battery, creating a low-impedance path that leads to a sharp increase in current. When this short circuit occurs, it can trigger thermal runaway, an uncontrollable and rapid rise in battery temperature, ultimately leading to a chain reaction of fire and explosion.

[0003] Based on this, the reduction in vehicle safety caused by external short circuit of the battery pack is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The embodiments of the present application provide a control method, device, medium, and electronic device for a vehicle battery pack circuit, thereby improving the safety of the vehicle battery pack circuit at least to a certain extent.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, a method for controlling a vehicle battery pack circuit is provided, the method comprising:

[0007] Obtaining a periodic current of a battery pack circuit of a target vehicle during a current detection cycle, wherein the periodic current includes the battery pack current of the battery pack circuit corresponding to each time point during the current detection cycle;

[0008] determining a target short circuit state of the battery pack circuit and a target duration of the target short circuit state based on the cycle current;

[0009] generating a target control strategy based on the target short-circuit state and the target duration, wherein the target control strategy is used to adjust the circuit state of the battery pack circuit through a target component;

[0010] The target element is controlled to execute the target control strategy.

[0011] In some embodiments of the present application, based on the aforementioned solution, determining the target short-circuit state of the battery pack circuit and the target duration of the target short-circuit state based on the cycle current includes:

[0012] Detecting the current operating state of the target vehicle, wherein the current operating state includes a driving state, a fast charging state, a slow charging state, and a stationary state;

[0013] determining a first current threshold and a second current threshold based on the current operating state, wherein the first current threshold is less than the second current threshold;

[0014] Extracting the target current at the current moment from the periodic current;

[0015] determining the target short circuit state of the battery pack circuit based on the first current threshold, the second current threshold, and the target current;

[0016] A length of time that the target vehicle is in the target short-circuit state is monitored based on the periodic current as the target duration.

[0017] In some embodiments of the present application, based on the aforementioned solution, the target short circuit state includes a light short circuit state or a moderate to severe short circuit state, and determining the target short circuit state of the battery pack circuit based on the first current threshold, the second current threshold, and the target current includes:

[0018] If the target current is greater than or equal to the second current threshold, determining that the target short-circuit state is the medium-to-severe short-circuit state;

[0019] If the target current is less than the second current threshold and greater than or equal to the first current threshold, the target short-circuit state is determined to be the light short-circuit state.

[0020] In some embodiments of the present application, based on the aforementioned solution, generating a target control strategy based on the target short-circuit state and the target duration includes:

[0021] determining the target element based on the target short circuit state and the target duration;

[0022] A control strategy corresponding to the target element is obtained as the target control strategy.

[0023] In some embodiments of the present application, based on the aforementioned solution, the battery pack of the target vehicle is sequentially connected to a main relay and a fuse, and determining the target element based on the target short-circuit state and the target duration includes:

[0024] If the target short-circuit state is the light short-circuit state, determining the vehicle controller as the target component;

[0025] If the target short circuit state is the medium to severe short circuit state, comparing the target duration with a time threshold, wherein the time threshold is determined based on a circuit element that allows the target vehicle to be controlled to enter a non-short circuit state;

[0026] If the target duration is less than the time threshold, determining the main relay as the target element;

[0027] If the target duration is greater than or equal to the time threshold, the fuse is determined as the target component.

[0028] In some embodiments of the present application, based on the above solution, obtaining the control strategy corresponding to the target element as the target control strategy includes:

[0029] If the target component is the vehicle controller, obtaining a power limiting strategy corresponding to the vehicle controller as the target control strategy, wherein the power limiting strategy is used to reduce the power of the target vehicle according to a target step size through a power limiting instruction and issue an early warning through an instrument;

[0030] If the target element is the main relay, obtaining a disconnection strategy corresponding to the main relay as the target control strategy, wherein the disconnection strategy is used to disconnect the main relay through a disconnection instruction;

[0031] If the target component is the fuse, a first detonation strategy corresponding to the fuse is obtained as the target control strategy, wherein the first detonation strategy is used to detonate the fuse and start the cooling system through a first detonation instruction.

[0032] In some embodiments of the present application, based on the above solution, the main relay is determined as the target element. After controlling the target element to execute the target control strategy, the method further includes:

[0033] Detecting whether the main relay has been cut off;

[0034] If the main relay is not disconnected, generating a second detonation strategy, wherein the second detonation strategy is used to detonate the fuse and start the cooling system through a second detonation instruction;

[0035] The fuse is controlled to execute the second detonation strategy.

[0036] According to a second aspect of an embodiment of the present application, a control device for a vehicle battery pack circuit is provided, the device comprising:

[0037] an acquisition module, configured to acquire a periodic current of a battery pack circuit of a target vehicle during a current detection cycle, wherein the periodic current includes the battery pack current of the battery pack circuit corresponding to each time point during the current detection cycle;

[0038] a determination module, configured to determine a target short-circuit state of the battery pack circuit and a target duration of the target short-circuit state based on the periodic current;

[0039] a generating module, configured to generate a target control strategy based on the target short-circuit state and the target duration, wherein the target control strategy is used to adjust the circuit state of the battery pack circuit through a target component;

[0040] A control module is used to control the target element to execute the target control strategy.

[0041] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by the method described in any one of the first aspects above.

[0042] According to a fourth aspect of an embodiment of the present application, an electronic device is provided, comprising one or more processors and one or more memories, wherein at least one computer program instruction is stored in the one or more memories, and the at least one computer program instruction is loaded and executed by the one or more processors to implement the method described in any embodiment of the first aspect above.

[0043] In this application, the cycle current of the battery pack circuit of a target vehicle during the current detection cycle is obtained, where the cycle current includes the battery pack current corresponding to each time point of the battery pack circuit during the current detection cycle; a target short-circuit state of the battery pack circuit and a target duration of the target short-circuit state are determined based on the cycle current; a target control strategy is generated based on the target short-circuit state and the target duration, where the target control strategy is used to adjust the circuit state of the battery pack circuit through a target element; and the target element is controlled to execute the target control strategy. In other words, the target control strategy is generated based on the target short-circuit state and the target duration to adjust the circuit state of the battery pack circuit, ensuring that the battery pack circuit is shut down and exits the short-circuit state when a short circuit begins, avoiding a chain reaction and thereby improving the safety of the vehicle's battery pack circuit.

[0044] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, explaining the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0046] Figure 1 A flow chart showing a method for controlling a vehicle battery pack circuit in an embodiment of the present application is shown;

[0047] Figure 2 A schematic diagram of a vehicle battery pack circuit in an embodiment of the present application is shown;

[0048] Figure 3 A demonstration diagram showing adjustment of a target short-circuit state of a battery pack circuit in an embodiment of the present application is shown;

[0049] Figure 4 A block diagram of a control device for a vehicle battery pack circuit in an embodiment of the present application is shown;

[0050] Figure 5 A schematic structural diagram of an electronic device in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0052] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0053] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0054] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0055] It should be noted that the term "plurality" used in this document refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0056] It should also be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that shown or described.

[0057] Figure 1 A flow chart showing a method for controlling a vehicle battery pack circuit in an embodiment of the present application is shown. The method for controlling a vehicle battery pack circuit can be executed by a device having a computing and processing function. Figure 1 As shown, the control method of the vehicle battery pack circuit includes:

[0058] Step 101: Obtaining a cycle current of a battery pack circuit of a target vehicle during a current detection cycle, wherein the cycle current includes the battery pack current of the battery pack circuit corresponding to each time point during the current detection cycle;

[0059] Step 102: determining a target short-circuit state of the battery pack circuit and a target duration of the target short-circuit state based on the cycle current;

[0060] Step 103: generating a target control strategy based on the target short-circuit state and the target duration, wherein the target control strategy is used to adjust the circuit state of the battery pack circuit through a target component;

[0061] Step 104: Control the target element to execute the target control strategy.

[0062] Through the above steps, the cycle current of the battery pack circuit of the target vehicle during the current detection cycle is obtained, where the cycle current includes the battery pack current corresponding to each time point in the current detection cycle. Based on the cycle current, the target short-circuit state of the battery pack circuit and the target duration of the target short-circuit state are determined. A target control strategy is generated based on the target short-circuit state and the target duration, where the target control strategy is used to adjust the circuit state of the battery pack circuit through a target component. The target component is controlled to execute the target control strategy. In other words, the target control strategy is generated based on the target short-circuit state and the target duration to adjust the circuit state of the battery pack circuit, ensuring that the battery pack circuit is shut down and exits the short-circuit state when a short circuit begins, avoiding a chain reaction and thereby improving the safety of the vehicle's battery pack circuit.

[0063] In the embodiment provided in step 101, the battery pack circuit of the above-mentioned target vehicle is a core component of the high-voltage electrical system of new energy vehicles (pure electric / hybrid), which may include but is not limited to: battery module array, main circuit protection elements, control unit, peripheral interface, etc.

[0064] In this application, the battery module array may include, but is not limited to, a plurality of lithium-ion cells connected in series or parallel. The main circuit protection components may include, but are not limited to, main relays, fuses, and current sensors. The control unit may include, but is not limited to, a BMS (battery management system) and a voltage / temperature detection module. The peripheral interfaces may include, but are not limited to, a CAN bus and a high-voltage interlock circuit.

[0065] Optionally, in this embodiment, the periodic current is a sequence of current values ​​continuously acquired within a set time window (pre-set detection period T0), reflecting the dynamic load characteristics of the circuit. The periodic current can be obtained by, but is not limited to, obtaining the battery pack current corresponding to each time point in the current detection period using a dual redundant current sensor arrangement.

[0066] Optionally, in this embodiment, it is possible but not limited to monitoring the battery pack current of the target vehicle starting from the power-on of the battery pack circuit, specifically including: collecting current through two current sensors inside the battery pack respectively, sending it to the BMS through the CAN network with a period of 10ms, and the BMS performing calibration based on the received current value. When there is a difference between the two received values, the value returned by the first current sensor is I (when a fault is detected in the first current sensor, the value sent by the second current sensor is I).

[0067] In the embodiment provided in step 102 , the target short-circuit state refers to a fault level classified according to the degree of current abnormality, which is used to match a corresponding protection strategy.

[0068] Optionally, in this embodiment, the target duration is the cumulative time that the battery pack circuit is in an abnormal current state, which is used to determine the severity of the fault and upgrade the protection level.

[0069] In one embodiment of the present application, the target short-circuit state of the battery pack circuit and the target duration of being in the target short-circuit state can be determined based on the cycle current in the following manner, but is not limited to: detecting the current operating state of the target vehicle, wherein the current operating state includes a driving state, a fast charging state, a slow charging state and a stationary state; determining a first current threshold and a second current threshold based on the current operating state, wherein the first current threshold is less than the second current threshold; extracting the target current at the current moment from the cycle current; determining the target short-circuit state of the battery pack circuit based on the first current threshold, the second current threshold and the target current; and monitoring the length of time the target vehicle is in the target short-circuit state based on the cycle current as the target duration.

[0070] Optionally, in this embodiment, the current operating state includes: driving state, fast charging state, slow charging state and static state. The current operating state can be detected by, but is not limited to, the following methods: obtaining the gear signal (P gear / D gear / R gear, etc.), the charging connection signal (fast charging gun / slow charging gun insertion state), the BMS (battery management system) state, the vehicle controller (VCU) instruction, etc.; if the gear signal is P gear and no charging gun is connected (fast charging gun / slow charging gun is not inserted), it is determined that its current operating state is static state; if the gear signal is D gear / R gear (driving gear) and no charging gun is connected, it is determined that its current operating state is driving state; if the fast charging gun is inserted (CC2 signal detection) and the charging pile handshake is successful (CP signal confirmation), it is determined that its current operating state is fast charging state; if the slow charging gun is inserted (CC signal detection) and the on-board charger (OBC) is activated, it is determined that its current operating state is slow charging state.

[0071] Optionally, in this embodiment, the first current threshold and the second current threshold can be determined for different current operating states in the following manner, but not limited to: if the current operating state is a static state, since the theoretical current should be close to 0 when static, the first current threshold is at least 5A (normal static current <2A, slightly abnormal range), and the second current threshold is 20A (directly judged as a serious fault); if the current operating state is a driving state, it is necessary to cover the maximum operating current of the motor (such as a peak value of 400A), the first current threshold is 300A (80% of the nominal value), and the second current threshold is 400A (hardware allowable limit); if the current operating state is a fast charging state, compatible with the output capacity of the charging pile (such as the national standard 250A), the first current threshold is 200A (80% of the nominal value), and the second current threshold is 250A (the upper limit of the pile end protocol); if the current operating state is a slow charging state, based on the conversion capability of the on-board charger (OBC), the first current threshold is 16A (80% of the nominal value), and the second current threshold is 20A (AC slow charging port safety limit).

[0072] Furthermore, temperature compensation can be used, for example: low temperature (<-10°C): the threshold is lowered by 10% (to account for reduced electrolyte activity); high temperature (>45°C): the threshold is raised by 5% (to compensate for increased internal resistance). Alternatively, battery SOC correction can be used: low battery (SOC <20%): the threshold is lowered by 15% (to avoid over-discharge risk). Alternatively, hardware aging compensation can be used: linear attenuation based on the number of battery cycles (the threshold is lowered by 2% every 1000 cycles).

[0073] In one embodiment of the present application, the target short circuit state includes a light short circuit state or a medium to severe short circuit state, and the target short circuit state of the battery pack circuit can be determined based on the first current threshold, the second current threshold and the target current in the following manner, but is not limited to: if the target current is greater than or equal to the second current threshold, the target short circuit state is determined to be the medium to severe short circuit state; if the target current is less than the second current threshold and greater than or equal to the first current threshold, the target short circuit state is determined to be the light short circuit state.

[0074] Optionally, in this embodiment, the light short circuit state is used to indicate a slight abnormality in the battery pack circuit, and the current value is ≥80% I th (first current threshold) but th (second current threshold) to make a judgment, for example: if I th =500A, then the light short circuit range is 400A ≤ I < 500A. A light short circuit in the battery pack circuit indicates that the current has not reached a severe short circuit level, but there is a tendency to exceed the normal range. This may be caused by a sudden load change, increased contact resistance, or an early short circuit failure. Therefore, the corresponding protective measures are triggered: output power is limited (for example, to 50%), and an instrument panel alarm alerts the user.​

[0075] Optionally, in this embodiment, the medium / severe short circuit state is used to indicate that there is a moderate / severe abnormality in the battery pack circuit, and the current value ≥I th A judgment is made (completely exceeding the second current threshold), for example: I ≥ 500A. If the battery pack circuit is in a medium to severe short circuit state, it is considered that the low impedance path causes a sharp increase in current, which may cause thermal runaway. It is necessary to further determine whether it is in a moderate short circuit or a severe short circuit based on the target duration. For example: if the current exceeds the threshold but the duration is short (such as T ≤ 4s), it is considered to be a moderate short circuit; if the current exceeds the threshold and the duration is long (such as T > 4s) or is accompanied by a sudden temperature rise, it is considered to be a severe short circuit. For a moderate short circuit, the main relay needs to be disconnected; for a severe short circuit, the fuse is triggered and the cooling system is activated.

[0076] In the example provided in step 103, the target control strategy dynamically selects and executes appropriate protective measures based on the detected target short circuit state (mild short circuit / moderate to severe short circuit) and target duration to eliminate the risk of an external battery short circuit. This strategy uses a hierarchical response mechanism to ensure safety while minimizing interference with normal vehicle operation.

[0077] In one embodiment of the present application, a target control strategy can be generated based on the target short-circuit state and the target duration in the following manner, but is not limited to: determining the target element based on the target short-circuit state and the target duration; and obtaining a control strategy corresponding to the target element as the target control strategy.

[0078] In one embodiment of the present application, the battery pack of the target vehicle can be connected to the main relay and the fuse in sequence in the following manner, but is not limited to: if the target short circuit state is the light short circuit state, the vehicle controller is determined as the target element; if the target short circuit state is the medium to heavy short circuit state, the target duration is compared with a time threshold, wherein the time threshold is determined based on a circuit element that allows the target vehicle to be controlled to enter a non-short circuit state; if the target duration is less than the time threshold, the main relay is determined as the target element; if the target duration is greater than or equal to the time threshold, the fuse is determined as the target element.

[0079] Optionally, in this embodiment, a minor short-circuit condition triggers level 1 protection. The trigger conditions include: current ≥ the first current threshold (I1) and duration T1 > 2s. For example, if the current is > 5A for 2s at rest, a power reduction command is sent to the VCU (vehicle control unit) via the CAN bus, implementing non-intrusive protection, allowing the vehicle to continue driving at low speeds.

[0080] Based on the target duration, the medium - short - circuit state is divided into medium - short - circuit or severe - short - circuit. The triggering conditions for medium - short - circuit include: current ≥ second current threshold (I2) and 2s < T ≤ 4s. For example, during driving, the current suddenly increases to 450A and lasts for 3s. Hardware - level protection is adopted to cut off the relay control circuit through MOS transistors.

[0081] The triggering conditions for severe - short - circuit include: current ≥ I2 and T > 4s or sudden temperature rise (ΔT / Δt > 10℃ / s). For example, during fast charging, the short - circuit current is 600A and lasts for 5s. Hardware - level ultimate protection is adopted to physically fuse the high - voltage circuit (response time < 50ms), and multi - system linkage is carried out. The cooling system prevents the spread of thermal runaway.

[0082] Optionally, in this embodiment, taking the example of an external short - circuit occurring during vehicle charging, the following is illustrated: t = 0 - 1s: The current rises to 180A (slow - charging state I1 = 16A), and T1 is accumulated; t = 1.5s: T1 > 2s, triggering primary protection (limiting the charging power); t = 2s: The current continues to rise to 25A (exceeding I2 = 20A), and T starts to be accumulated; t = 4.1s: T > 4s, triggering tertiary protection (fusing + cooling).

[0083] It should be noted that during primary protection, if the current continues to rise, it will automatically skip secondary protection and directly trigger tertiary protection.

[0084] Optionally, in this embodiment, Figure 2 shows a schematic diagram of the vehicle battery pack circuit in the embodiments of the present application, as Figure 2 shown, the positive output terminal of the battery pack is connected to the current sensor, and the total output current is monitored in real - time through the current sensor to provide the original data input for the BMS protection strategy.

[0085] A main relay is connected downstream of the current sensor. The main relay is used to control the on - off of the high - voltage circuit under normal working conditions and carry the continuous working current;

[0086] A pyrotechnic fuse (PDD) is connected between the relay and the load. The pyrotechnic fuse is used to physically fuse the circuit when the relay fails.

[0087] In one embodiment of the present application, the control strategy corresponding to the target element can be obtained as the target control strategy in the following manner, but is not limited to: if the target element is the vehicle controller, the power limitation strategy corresponding to the vehicle controller is obtained as the target control strategy, wherein the power limitation strategy is used to reduce the power of the target vehicle according to the target step size through a power limitation instruction, and to issue an early warning through an instrument; if the target element is the main relay, the disconnection strategy corresponding to the main relay is obtained as the target control strategy, wherein the disconnection strategy is used to disconnect the main relay through a disconnection instruction; if the target element is the fuse, the first detonation strategy corresponding to the fuse is obtained as the target control strategy, wherein the first detonation strategy is used to detonate the fuse through a first detonation instruction and start the cooling system.

[0088] In the embodiment provided in step 104 , corresponding instructions may be sent to the target component to control it to execute the target control strategy, but is not limited to this.

[0089] In one embodiment of the present application, the main relay is determined as the target element. After controlling the target element to execute the target control strategy, the circuit state of the battery pack circuit can be further adjusted in the following manners, but is not limited to: detecting whether the main relay has been cut off; if the main relay has not been cut off, generating a second ignition strategy, wherein the second ignition strategy is used to ignite the fuse and start the cooling system through a second ignition instruction; and controlling the fuse to execute the second ignition strategy.

[0090] In order to make those skilled in the art better understand the above-mentioned vehicle battery pack circuit control method, the following will be combined with Figure 3 To explain, Figure 3 A demonstration diagram of adjusting the target short-circuit state of the battery pack circuit in an embodiment of the present application is shown, as shown in FIG. Figure 3 As shown in the figure, the solution adopts a three-level protection architecture of "monitoring-judgment-execution", with the battery management system (BMS) as the control core, and implements hierarchical protection through key components connected in series in the high-voltage main circuit. The workflow is as follows:

[0091] Signal acquisition layer: Dual redundant current sensors monitor the total output current of the battery pack in real time.

[0092] Status judgment layer: BMS performs fault diagnosis based on the vehicle status (driving / charging / stationary), ambient temperature, and current characteristics, including:

[0093] Level 1 protection (slight overcurrent): Trigger condition: Current continuously exceeds the light short-circuit threshold (I1 = 80% operating threshold) for >2 seconds; Implementation measures: Limit output power to 50%, display a yellow warning on the instrument panel, and record the fault code (automatically recoverable);

[0094] Level 2 protection (moderate short circuit): Triggering condition: Current exceeds the severe short circuit threshold (I2) for 2 to 4 seconds. Implementation measures: Immediately disconnect the main relay and start voltage difference detection (to confirm the actual status of the relay). If the relay does not disconnect, upgrade to level 3 protection.

[0095] Level 3 protection (serious fault): Triggering conditions: The current exceeds the threshold for more than 4 seconds, or the temperature rise rate is greater than 10℃ / s. Implementation measures: Detonate the PDD to forcibly disconnect the high voltage, start the liquid cooling system at maximum power, and send an emergency signal to the cloud monitoring platform.

[0096] Protection execution layer: triggers relay disconnection or PDD fusing in sequence according to the fault level.

[0097] If the vehicle is powered off during execution, the process ends.

[0098] In this technical solution, the fuse switches from passive melting (relying solely on overcurrent heating) to active electronic triggering (directly controlled by the BMS), forming a "soft and hard" protection chain with the relay to improve the success rate of fault handling. A three-level response strategy is implemented: first-level protection reduces power, second-level protection disconnects the relay, and third-level protection explodes the PDD. First-level protection can automatically recover, and second-level protection supports remote reset to reduce unnecessary maintenance.

[0099] By optimizing the collaborative working mechanism of the fuse (PDD) and the main relay through the method proposed in this application, the external short-circuit protection performance of new energy vehicle batteries is comprehensively improved. Compared with existing technologies, this solution shortens the short-circuit response time and improves the protection accuracy. Through a three-level dynamic protection strategy (power limitation-relay disconnection-PDD fusing) and intelligent status diagnosis, the system can trigger the PDD within a short time (5ms) when the relay fails, while improving the modular design and making maintenance more efficient.

[0100] The following describes an embodiment of the device of the present application, which can be used to implement the control method of the vehicle battery pack circuit in the above-mentioned embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the control method of the vehicle battery pack circuit in the above-mentioned embodiment of the present application.

[0101] See also Figure 4 , shows a block diagram of a control device for a vehicle battery pack circuit in an embodiment of the present application.

[0102] like Figure 4As shown, the control device (400) of the vehicle battery pack circuit according to an embodiment of the present application includes: an acquisition module 401, a determination module 402, a generation module 403, and a control module 404.

[0103] The acquisition module is configured to acquire a periodic current of a battery pack circuit of a target vehicle during a current detection cycle, wherein the periodic current includes the battery pack current corresponding to each time point of the battery pack circuit during the current detection cycle;

[0104] a determination module, configured to determine a target short-circuit state of the battery pack circuit and a target duration of the target short-circuit state based on the periodic current;

[0105] a generating module, configured to generate a target control strategy based on the target short-circuit state and the target duration, wherein the target control strategy is used to adjust the circuit state of the battery pack circuit through a target component;

[0106] A control module is used to control the target element to execute the target control strategy.

[0107] In some embodiments of the present application, based on the aforementioned solution, the determining module includes:

[0108] a detection unit, configured to detect a current operating state of the target vehicle, wherein the current operating state includes a driving state, a fast charging state, a slow charging state, and a stationary state;

[0109] a first determining unit, configured to determine a first current threshold and a second current threshold based on the current operating state, wherein the first current threshold is smaller than the second current threshold;

[0110] an extraction unit, configured to extract a target current at a current moment from the periodic current;

[0111] a second determining unit, configured to determine the target short-circuit state of the battery pack circuit based on the first current threshold, the second current threshold, and the target current;

[0112] A monitoring unit is configured to monitor, based on the periodic current, a time length during which the target vehicle is in the target short-circuit state as the target duration.

[0113] In some embodiments of the present application, based on the aforementioned scheme, the target short circuit state includes a light short circuit state or a medium to severe short circuit state, and the second determination unit is also used to: if the target current is greater than or equal to the second current threshold, determine that the target short circuit state is the medium to severe short circuit state; if the target current is less than the second current threshold and greater than or equal to the first current threshold, determine that the target short circuit state is the light short circuit state.

[0114] In some embodiments of the present application, based on the aforementioned solution, the generating module includes:

[0115] a third determining unit, configured to determine the target component based on the target short-circuit state and the target duration;

[0116] An acquiring unit is configured to acquire a control strategy corresponding to the target element as the target control strategy.

[0117] In some embodiments of the present application, based on the aforementioned scheme, the battery pack of the target vehicle is connected to the main relay and the fuse in sequence, and the third determination unit is also used to: if the target short-circuit state is the light short-circuit state, determine the vehicle controller as the target element; if the target short-circuit state is the medium to heavy short-circuit state, compare the target duration with a time threshold, wherein the time threshold is determined based on the circuit element that allows the target vehicle to be controlled to enter a non-short-circuit state; if the target duration is less than the time threshold, determine the main relay as the target element; if the target duration is greater than or equal to the time threshold, determine the fuse as the target element.

[0118] In some embodiments of the present application, based on the above-mentioned scheme, the third determination unit is also used to: if the target element is the vehicle controller, obtain the power limitation strategy corresponding to the vehicle controller as the target control strategy, wherein the power limitation strategy is used to reduce the power of the target vehicle according to the target step size through a power limitation instruction, and issue an early warning through an instrument; if the target element is the main relay, obtain the disconnection strategy corresponding to the main relay as the target control strategy, wherein the disconnection strategy is used to disconnect the main relay through a disconnection instruction; if the target element is the fuse, obtain the first detonation strategy corresponding to the fuse as the target control strategy, wherein the first detonation strategy is used to detonate the fuse through a first detonation instruction and start the cooling system.

[0119] In some embodiments of the present application, based on the aforementioned scheme, the main relay is determined as the target element. After controlling the target element to execute the target control strategy, the third determination unit is further used to: detect whether the main relay has been cut off; if the main relay has not been cut off, generate a second detonation strategy, wherein the second detonation strategy is used to detonate the fuse and start the cooling system through a second detonation instruction; and control the fuse to execute the second detonation strategy.

[0120] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, which stores at least one computer program instruction. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by the method described above.

[0121] Based on the same inventive concept, the present application also provides an electronic device, referring to Figure 5 , shows a structural diagram of an electronic device in an embodiment of the present application, wherein the electronic device includes one or more memories 504, one or more processors 502, and at least one computer program (computer program instruction) stored in the memory 504 and executable on the processor 502, and when the processor 502 executes the computer program, the method described above is implemented.

[0122] Among them, Figure 5 In the embodiment of the present invention, a bus architecture (represented by bus 500) is shown. Bus 500 may include any number of interconnected buses and bridges, and bus 500 links various circuits including one or more processors represented by processor 502 and memory represented by memory 504. Bus 500 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 505 provides an interface between bus 500 and receiver 501 and transmitter 503. Receiver 501 and transmitter 503 may be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 502 is responsible for managing bus 500 and general processing, while memory 504 may be used to store data used by processor 502 when performing operations.

[0123] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Furthermore, the functional units may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0124] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0125] The units described as separate components may or may not be physically separate, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0126] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store computer program instructions.

[0127] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of the claims of the present application.

Claims

1. A method for controlling a vehicle battery pack circuit, characterized in that: The method comprises: Obtaining a periodic current of a battery pack circuit of a target vehicle during a current detection cycle, wherein the periodic current includes the battery pack current of the battery pack circuit corresponding to each time point during the current detection cycle; determining a target short circuit state of the battery pack circuit and a target duration of the target short circuit state based on the cycle current; generating a target control strategy based on the target short-circuit state and the target duration, wherein the target control strategy is used to adjust the circuit state of the battery pack circuit through a target component; The target element is controlled to execute the target control strategy.

2. The method according to claim 1, characterized in that The determining of a target short-circuit state of the battery pack circuit and a target duration of the target short-circuit state based on the cycle current includes: Detecting the current operating state of the target vehicle, wherein the current operating state includes a driving state, a fast charging state, a slow charging state, and a stationary state; determining a first current threshold and a second current threshold based on the current operating state, wherein the first current threshold is less than the second current threshold; Extracting the target current at the current moment from the periodic current; determining the target short circuit state of the battery pack circuit based on the first current threshold, the second current threshold, and the target current; A length of time that the target vehicle is in the target short-circuit state is monitored based on the periodic current as the target duration.

3. The method according to claim 2, characterized in that The target short circuit state includes a light short circuit state or a moderate to severe short circuit state. Determining the target short circuit state of the battery pack circuit based on the first current threshold, the second current threshold, and the target current includes: If the target current is greater than or equal to the second current threshold, determining that the target short-circuit state is the medium-to-severe short-circuit state; If the target current is less than the second current threshold and greater than or equal to the first current threshold, the target short-circuit state is determined to be the light short-circuit state.

4. The method according to claim 1, wherein Generating a target control strategy based on the target short-circuit state and the target duration includes: determining the target element based on the target short circuit state and the target duration; A control strategy corresponding to the target element is obtained as the target control strategy.

5. The method according to claim 3, characterized in that The battery pack of the target vehicle is connected to a main relay and a fuse in sequence, and determining the target element based on the target short-circuit state and the target duration includes: If the target short-circuit state is the light short-circuit state, determining the vehicle controller as the target component; If the target short circuit state is the medium to severe short circuit state, comparing the target duration with a time threshold, wherein the time threshold is determined based on a circuit element that allows the target vehicle to be controlled to enter a non-short circuit state; If the target duration is less than the time threshold, determining the main relay as the target element; If the target duration is greater than or equal to the time threshold, the fuse is determined as the target component.

6. The method according to claim 5, characterized in that The acquiring the control strategy corresponding to the target element as the target control strategy includes: If the target component is the vehicle controller, obtaining a power limiting strategy corresponding to the vehicle controller as the target control strategy, wherein the power limiting strategy is used to reduce the power of the target vehicle according to a target step size through a power limiting instruction and issue an early warning through an instrument; If the target element is the main relay, obtaining a disconnection strategy corresponding to the main relay as the target control strategy, wherein the disconnection strategy is used to disconnect the main relay through a disconnection instruction; If the target component is the fuse, a first detonation strategy corresponding to the fuse is obtained as the target control strategy, wherein the first detonation strategy is used to detonate the fuse and start the cooling system through a first detonation instruction.

7. The method according to claim 5, characterized in that Determining the main relay as the target element, and after controlling the target element to execute the target control strategy, the method further includes: Detecting whether the main relay has been cut off; If the main relay is not disconnected, generating a second detonation strategy, wherein the second detonation strategy is used to detonate the fuse and start the cooling system through a second detonation instruction; The fuse is controlled to execute the second detonation strategy.

8. A control device for a vehicle battery pack circuit, characterized in that: The device comprises: an acquisition module, configured to acquire a periodic current of a battery pack circuit of a target vehicle during a current detection cycle, wherein the periodic current includes the battery pack current of the battery pack circuit corresponding to each time point during the current detection cycle; a determination module, configured to determine a target short-circuit state of the battery pack circuit and a target duration of the target short-circuit state based on the periodic current; a generating module, configured to generate a target control strategy based on the target short-circuit state and the target duration, wherein the target control strategy is used to adjust the circuit state of the battery pack circuit through a target component; A control module is used to control the target element to execute the target control strategy.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer program instructions, which are loaded and executed by a processor to implement the operations performed by the method according to any one of claims 1 to 7.

10. An electronic device comprising a processor and a memory, characterized in that: The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the processor implements the method according to any one of claims 1 to 7.

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