Control method and system for new energy battery

Abstract

The invention provides a control method and system for a new energy battery. The method comprises the steps of obtaining real-time operation parameter data of a target battery, then determining a micro-short-circuit event according to a combined threshold value of a single voltage change value, an internal resistance change value and a local temperature change value in the real-time operation parameter data, and responding to the micro-short-circuit event, according to a chemical system, health parameters and a current environment working condition of the target battery, determining a micro-short-circuit state of the target battery. And determining a target current density and a target temperature window of the self-healing operation, so as to execute the self-healing operation in which the pulse current and the stable current are combined in stages in the target current density and the target temperature window, thereby effectively removing dendrites in the battery and recovering electrochemical balance. And the risk that micro short circuit is developed into hard short circuit or thermal runaway is reduced.

Description

Technical Field

[0001] This application relates to data processing technology, and more particularly to a control method and system for new energy batteries. Background Technology

[0002] In recent years, with the rapid development of new energy vehicles and energy storage equipment, the safety, lifespan and performance stability of power batteries, as the main energy supply devices, have become the focus of industry attention.

[0003] Under complex operating conditions such as long-term high-rate charge-discharge, frequent deep cycling, and low temperatures, dendrites may grow on the surface of the negative electrode inside the battery. When dendrites extend towards the separator and may penetrate it, a conductive path will be formed between the positive and negative electrodes, leading to an internal short circuit. In the initial stage of the short circuit, dendrites may cause transient abnormal current or heat generation; this state is usually called a micro-short circuit.

[0004] If a micro short circuit is not effectively handled, it may develop into a hard short circuit, affecting the battery's safety performance. Summary of the Invention

[0005] This application provides a control method and system for new energy batteries, which can effectively remove dendrites in the battery and restore electrochemical balance, thereby reducing the risk of micro short circuits developing into hard short circuits or thermal runaway.

[0006] In a first aspect, this application provides a control method for new energy batteries, comprising: Acquire real-time operating parameter data of the target battery, including changes in single-cell voltage, internal resistance, and local temperature. Micro-short circuit events are determined based on a combined threshold value of the individual cell voltage change, the internal resistance change, and the local temperature change. In response to the micro-short circuit event, the target current density and target temperature window for self-healing operation are determined based on the chemical system, health parameters, and current environmental conditions of the target battery. The self-healing operation, consisting of a phased combination of pulsed current and steady current, is performed within the target current density and target temperature window.

[0007] Optionally, the combined threshold includes at least one combination of the following: the single-unit voltage change value being greater than the voltage change threshold, the internal resistance change value being less than the internal resistance change threshold, and the local temperature change value being greater than the temperature change threshold.

[0008] Optionally, determining the target current density and target temperature window for self-healing operation based on the target battery's chemical system, health parameters, and current environmental conditions includes: The initial values ​​of the optimal current density and optimal temperature for dendrite dissolution are determined based on the chemical system of the target battery. The initial values ​​of the optimal current density and the optimal temperature are corrected based on the health parameters of the target battery to form corrected current density and corrected temperature. The corrected current density and the corrected temperature are adjusted according to the current environmental conditions to form the target current density and the target temperature window.

[0009] Optionally, the chemical system includes a ternary lithium battery system, a lithium iron phosphate battery system, and a solid-state battery system, and the initial values ​​of the optimal current density and the initial values ​​of the optimal temperature for different chemical systems are stored in a preset self-healing condition database.

[0010] Optionally, a self-healing operation combining pulsed current and steady current is performed within the target current density and target temperature window, including: Within the target current density range, a pulse phase is entered, and high-rate current and low-rate current are applied alternately. The high-rate current is used to trigger the mechanical fracture of dendrites, and the low-rate current is used to control the mild electrochemical reaction on the dendrite surface. Within the target temperature window, the system enters a stable phase. Within the target temperature window, a constant rate current is applied and maintained for a preset time. The constant rate current is used to completely dissolve and reduce the dendrite residue.

[0011] Optionally, the high-rate current is an instantaneous charge-discharge current with a rate value greater than 3C and not exceeding 5C of the rated capacity of the target battery, used to induce local dissolution or fracture of the dendrite surface in a short time, wherein C is the current unit corresponding to the rated capacity of the target battery. The low-rate current is a moderate charge-discharge current with a rate value greater than 0.5C and not exceeding 1.5C of the rated capacity of the target battery, used to reduce internal pressure changes and suppress side reactions during dendrite dissolution. The constant rate current is a steady-state charge-discharge current with a rate value greater than 1C of the rated capacity of the target battery and not exceeding 2C of the rated capacity, used to maintain the electrochemical conditions required for complete dendrite dissolution within the target temperature window.

[0012] Optionally, the alternating application of high-rate current and low-rate current includes: First, maintain the high-rate current application time for no more than 500 milliseconds, then immediately apply the low-rate current for a duration between 1 and 3 seconds, alternating between 3 and 8 cycles; wherein the specific number of cycles is automatically adjusted according to the chemical system of the target battery.

[0013] Secondly, this application provides a control system for new energy batteries, comprising: The acquisition module is used to acquire real-time operating parameter data of the target battery, including single cell voltage change value, internal resistance change value, and local temperature change value. The processing module is used to determine a micro-short circuit event based on a combined threshold of the single-cell voltage change value, the internal resistance change value, and the local temperature change value; The processing module is also used to respond to the micro short circuit event by determining the target current density and target temperature window for self-healing operation based on the chemical system, health parameters and current environmental conditions of the target battery. An execution module is configured to perform the self-healing operation, which combines a phased pulse current with a stable current, within the target current density and the target temperature window.

[0014] Thirdly, this application provides an electronic device, comprising: Processor; and, Memory for storing the executable instructions of the processor; The processor is configured to perform any of the possible methods described in the first aspect by executing the executable instructions.

[0015] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement any of the possible methods described in the first aspect.

[0016] The control method and system for new energy batteries provided in this application acquire real-time operating parameter data of the target battery, and then determine micro-short circuit events based on a combination threshold of single-cell voltage change, internal resistance change, and local temperature change values ​​in the real-time operating parameter data. In response to the micro-short circuit event, the target current density and target temperature window for self-healing operation are determined based on the target battery's chemical system, health parameters, and current environmental conditions. Within the target current density and target temperature window, a phased combination of pulsed current and stable current is executed for self-healing operation, thereby effectively removing dendrites in the battery and restoring electrochemical balance, thus reducing the risk of micro-short circuits developing into hard short circuits or thermal runaway. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] Figure 1This is a schematic flowchart illustrating a control method for a new energy battery according to an example embodiment of this application; Figure 2 This is a schematic diagram of the structure of a control system for a new energy battery according to an example embodiment of this application; Figure 3 This is a schematic diagram of the structure of an electronic device according to an example embodiment of this application.

[0019] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] Figure 1 This is a schematic flowchart illustrating a control method for a new energy battery according to an example embodiment of this application. Figure 1 As shown, the control method for new energy batteries provided in this embodiment includes: S101. Obtain real-time operating parameter data of the target battery.

[0022] In this step, real-time operating parameter data of the target battery is acquired. This real-time operating parameter data includes changes in individual cell voltage, internal resistance, and local temperature. It is worth noting that the target battery can be a power battery pack for a new energy vehicle, or it can be a single cell within that power battery pack.

[0023] Specifically, acquiring real-time operating parameter data of the target battery can be achieved through monitoring modules and sensor systems installed within the battery pack. Specifically, the individual cell voltage change is measured in real-time by a voltage acquisition module with an accuracy of at least ±1 mV, at a measurement frequency of at least 50 times per second. The internal resistance change can be obtained by applying a known pulse current at a preset instant, measuring the voltage response, and then calculating the result. Local temperature changes can be acquired by temperature sensors located at multiple positions inside and on the surface of the cell, and processed using a weighted average algorithm to obtain a representative local temperature change. Then, the acquired data undergoes preliminary filtering and noise reduction by the local processing unit before being input to the battery management system as a basis for subsequent judgments.

[0024] S102. Determine the micro-short circuit event based on the combined threshold of the individual unit voltage change value, internal resistance change value, and local temperature change value.

[0025] Optionally, the combined threshold in this step can be at least one of the following combinations: the single-unit voltage change value is greater than the voltage change threshold, the internal resistance change value is less than the internal resistance change threshold, and the local temperature change value is greater than the temperature change threshold.

[0026] The combined threshold values ​​are set within the self-healing condition database and can be adaptively adjusted using historical operating data. For example, a micro-short circuit is determined to be possible when the voltage change exceeds the voltage change threshold (e.g., 20 mV), the internal resistance change is below the internal resistance change threshold (e.g., 0.1 mΩ), and the local temperature change exceeds the temperature change threshold (e.g., 3°C), or when any of the above three conditions meet any set combination. This determination can be automatically completed by a multi-condition logic algorithm, and the event signal is output to the self-healing operation control module in real time.

[0027] It is worth noting that, because the combined threshold includes at least one combination of three parameters—voltage, internal resistance, and temperature—and each parameter threshold originates from different physical processes—voltage reflects potential changes, internal resistance reflects interface impedance changes, and temperature reflects thermal coupling effects—it can simultaneously capture micro-short-circuit symptoms caused by different mechanisms, reducing single-parameter misjudgments. Furthermore, this multi-parameter combined judgment logic enables the system to maintain high judgment accuracy under complex operating conditions, thereby avoiding invalid self-healing operations and resource waste, while ensuring timely triggering of the self-healing process in necessary scenarios.

[0028] S103. In response to a micro-short circuit event, determine the target current density and target temperature window for self-healing operation based on the target battery's chemical system, health parameters, and current environmental conditions.

[0029] Based on the target battery design parameters, the system can determine whether it uses ternary lithium, lithium iron phosphate, or solid-state batteries, and call upon preset optimal parameters for dendrite dissolution, such as those stored in a self-healing condition database. This database stores the optimal current density and initial temperature values ​​for different chemical systems, enabling the system to quickly complete parameter matching, reducing real-time computational load, and ensuring that the parameters used are experimentally verified, safe, and effective.

[0030] Then, based on the remaining capacity percentage, cycle count, and internal resistance offset of the target battery, the initial values ​​of the optimal current density and optimal temperature are corrected, for example, by reducing the current density of the aged battery.

[0031] Next, environmental condition correction is performed, which involves calling environmental sensor data (ambient temperature, humidity, vibration conditions) to further correct the above values. For example, in low-temperature environments, the upper limit of the temperature window is appropriately increased to ensure the stability of the dendrite dissolution rate. The final target current density and target temperature window will be used as control parameters for the self-healing execution stage.

[0032] It is worth noting that by determining the optimal initial current density and temperature values ​​for dendrite dissolution based on the chemical system, the application conditions of pulsed current and constant current can be aligned with the lithium deposition and dendrite structure characteristics of different materials, thereby improving the dissolution efficiency per unit time. Furthermore, by correcting health parameters and environmental conditions, the theoretically optimal conditions are aligned with the current actual tolerance conditions of the battery, reducing side reactions or material performance degradation caused by excessive conditions, thus achieving a highly efficient self-healing control strategy.

[0033] S104. Perform a phased self-healing operation combining pulsed current and steady current within the target current density and target temperature window.

[0034] During the pulse phase, high-rate and low-rate currents can be applied alternately within the target current density. The high-rate current acts instantaneously on the dendrite surface, generating localized stress and micro-thermal effects, promoting dendrite fracture or surface dissolution. The low-rate current is used to maintain a slow electrochemical reaction, reducing side reactions and drastic changes in internal pressure.

[0035] Regarding the duration of alternating high-rate and low-rate currents within the target current density, the high-rate current application time can be maintained at no more than 500 milliseconds, followed immediately by a low-rate current for a duration between 1 and 3 seconds. The number of alternating cycles should be no less than 3 and no more than 8. Maintaining the high-rate current application time at no more than 500 milliseconds ensures that the impact effect is concentrated on the dendrite structure, preventing overheating of the entire electrode area. A duration exceeding 500 ms would trigger a significant temperature rise and large-area electrochemical reactions. Applying the low-rate current for a duration between 1 and 3 seconds allows for the slow dissolution of dendrite residues on the fractured surface and stabilizes the interfacial reaction. Too short a time results in insufficient dissolution, while too long a time delays overall cycle efficiency. Furthermore, the number of alternating cycles (no less than 3 and no more than 8) directly affects the thoroughness of dendrite removal. Fewer than 3 cycles result in insufficient dissolution or fracture, while more than 8 cycles increase energy consumption and may accelerate material aging.

[0036] Furthermore, the number of cycles in the pulse phase is automatically adjusted according to the chemical system; for example, 3-5 cycles for lithium iron phosphate, 4-6 cycles for ternary lithium, and 5-8 cycles for solid-state batteries. It is worth noting that setting the number of cycles for different chemical systems ensures that the number of pulse and easing cycles matches the reaction kinetics of the material, reducing the risk of incomplete or excessive reactions. It is also worth noting that because ternary materials have a relatively high reaction rate and good dendrite dissolution efficiency, the required number of cycles is in the middle range. Lithium iron phosphate, on the other hand, has a slightly lower ion diffusion rate and a weaker dendrite growth tendency, thus requiring fewer self-healing cycles. Solid-state systems have high interfacial impedance and slow ion migration, making dendrite removal difficult and requiring more high- and low-rate cycles to enhance the fracture and dissolution process.

[0037] Optionally, the aforementioned high-rate current is an instantaneous charge-discharge current with a rate value greater than 3C and not exceeding 5C of the target battery's rated capacity, used to induce localized dissolution or fracture of the dendrite surface within a short period of time, where C is the current unit corresponding to the target battery's rated capacity. The aforementioned low-rate current is a moderate charge-discharge current with a rate value greater than 0.5C and not exceeding 1.5C of the target battery's rated capacity, used to reduce internal pressure changes and suppress side reactions during dendrite dissolution.

[0038] It is worth noting that current density directly affects concentration polarization and reaction rate at the electrode interface. Excessively high current density can cause the metal deposition rate to exceed the uniform deposition rate, thus exacerbating the risk of dendrite formation. Furthermore, high-rate pulses can create high stress concentration at the dendrite-electrode junction, promoting fracture. Too low a current density results in insufficient stress, while too high a current density may cause the active layer of the electrode to peel off. Optionally, the high-rate current can be set to 3C–5C of the rated capacity, thereby creating a significant electric field gradient in the dendrite region, instantaneously enhancing the ion migration rate and generating local overpotential, causing mechanical fracture or peeling of the lithium dendrite structure. This quickly removes larger dendrites, preventing them from piercing the separator, but it needs to be controlled within the upper limit to avoid electrode material disintegration and excessive heating that could trigger side reactions. The electrode structure strength and heat of reaction differ between different chemical systems. For example, the active layer of ternary lithium is more brittle, allowing for shorter durations of high-rate pulses; lithium iron phosphate has a more robust structure and can tolerate slightly higher pulse rates.

[0039] In other words, if the high-rate current is below 3C, the current density is insufficient to generate an effective electric field impact, and the dendrite fracture initiation energy cannot be reached. However, if the high-rate current exceeds 5C, it will lead to significant electrolyte side reactions, local heat accumulation, and the risk of electrode structure damage.

[0040] Setting the low-rate current to 0.5C–1.5C is to maintain the dissolution of lithium ions from the dendrite base into the electrolyte under a gentle electric field, reducing sudden heat flux density and side reaction rates. This effectively alleviates dendrite residue, reduces the probability of new lithium plating, and ensures safety. Specifically, after dendrite breakage, the low-rate current is used to slowly drive the local dissolution process, slowing down concentration polarization and rapid changes in battery internal pressure, reducing the side reaction rate, and facilitating the reformation of a stable electrochemical interface on the electrode surface. If the low-rate current is below 0.5C, the dendrite surface dissolution rate is insufficient, which may lead to the continued growth of broken residue. If the low-rate current exceeds 1.5C, the excessively high current at this stage will re-trigger violent side reactions, disrupting the gentle dissolution process.

[0041] In the steady-state phase, a constant current rate is applied within the target temperature window and maintained for a preset time. Under relatively stable temperature conditions, the constant current rate promotes the complete dissolution of fractured or partially dissolved dendrite residues and facilitates electrochemical reduction. Furthermore, the control precision in this phase depends on the temperature closed-loop control command and current feedback to ensure that the entire process remains within the target temperature window and current density range.

[0042] It is worth noting that the aforementioned constant rate current refers to a steady-state charge-discharge current with a rate greater than 1C and not exceeding 2C of the target battery's rated capacity. This current is used to maintain the electrochemical conditions required for complete dendrite dissolution within the target temperature window. Specifically, continuously applying a constant current within the target temperature window allows the dendrite residue to completely dissolve and be reduced to a uniform deposition, restoring the normal conductive path and maintaining a stable electrochemical reaction environment, which facilitates uniform ion migration and interface repair. If the constant rate current is below 1C, sufficient current density cannot be guaranteed to maintain the chemical reaction kinetics; if the constant rate current exceeds 2C, thermal runaway or side reactions are easily triggered, affecting the self-healing quality.

[0043] The application time of the aforementioned constant rate current should be no less than 3 minutes and no more than 10 minutes to ensure that the dissolved dendrite residue is completely electrochemically reduced within the target temperature window. The lower limit of the constant rate current application time ensures that the reaction proceeds completely, while the upper limit prevents thermal imbalance caused by prolonged high load on the battery. This time control strategy meets the requirement of achieving complete dendrite dissolution without affecting the overall vehicle function, ensuring the repeatability and safety of the self-healing effect.

[0044] The purpose of setting the constant current rate to 1C–2C of the rated capacity and maintaining it for a long duration is to allow the metal ions that have entered the electrolyte to reform a uniform deposition on the electrode surface during the stable diffusion process, preventing the formation of secondary dendrites, thereby completing the chemical balance repair and prolonging the self-healing effect.

[0045] It is worth noting that a high-rate pulsed current is used to trigger dendrite mechanical fracture, a low-rate current is used to control and moderate the electrochemical reaction, and a constant-rate current is used to promote residual dissolution. This staged current mode directly acts on the dendrite state at different stages, achieving targeted intervention. The complementary switching of conditions and mechanisms between stages makes the self-healing process both rapid and stable, reducing interference with the vehicle's power output and avoiding severe thermal fluctuations or pressure shocks inside the battery.

[0046] Optionally, the aforementioned self-healing operation itself introduces alternating high and low current rates and constant current rate phases, leading to short-term fluctuations in battery-side available power, internal resistance, and thermal state. If the vehicle control unit fails to detect these changes, a power shortfall may occur even without derating the drive torque request, triggering a bus voltage drop or inverter current limiting. Furthermore, exceeding the battery's allowable charging current during regenerative braking or energy recovery will cause the battery management system to forcibly limit current, resulting in decreased braking consistency. In addition, if the vehicle control unit fails to pre-plan the torque trajectory, frequent torque corrections will occur, affecting ride smoothness.

[0047] To this end, while performing a phased self-healing operation combining pulsed current and stable current within the target current density and target temperature window, control commands corresponding to the self-healing operation can be transmitted between the battery management system and the vehicle control unit. The control commands include predicted current trajectory and power availability curve, so that the vehicle control unit can adjust the drive current strategy in advance to avoid transient impacts.

[0048] The aforementioned predicted current trajectory refers to the expected time sequence or piecewise function that the self-healing operation will apply to the battery port current within a predetermined prediction time window. This is used to inform the vehicle control unit in advance of the current amplitude, direction, and duration at each stage, enabling the vehicle to perform feedforward coordination. It reflects "what current will occur" during the self-healing process, including the alternation of high / low rates during the pulse phase and the constant rate current during the stable phase. This allows the vehicle control unit to obtain information on the current's rising / falling edge slope and duration before the phase begins, thereby arranging torque limiting, energy recovery limits, and accessory power peak shifting to reduce bus surge.

[0049] The available power curve refers to the time series boundary (or segmented upper / lower envelope) of the maximum allowable discharge power and maximum charging power at the battery end within the prediction time window. This boundary already accounts for the impact of self-healing operations on thermal, pressure, and resistance conditions. It allows the vehicle control unit to obtain information on the current rising / falling edge slope and duration before the phase begins, thereby arranging torque limiting, energy recovery limits, and accessory power peak shifting to reduce bus surge. It reflects the "power still available for the vehicle" during the self-healing process, providing the vehicle control unit with dynamic power and recovery limits for drive and braking distribution, energy recovery, and accessory scheduling.

[0050] By transmitting control commands corresponding to the self-healing operation between the battery management system (BMS) and the vehicle control unit (VCU), feedforward coordinated control between the BMS and VCU can be achieved during the self-healing operation, which combines phased pulse current and stable current. By providing the VCU with predictions of the available power boundary and current trajectory during the self-healing period, the vehicle's power and energy management strategies converge in advance, avoiding impacts on the drive system and accessory systems caused by transient current / power changes, thus improving the vehicle's controllability and safety during the self-healing process. In other words, after the VCU receives the control commands corresponding to the self-healing operation in advance, the drive and braking torque trajectories transition smoothly, reducing torque spikes and ride vibrations caused by sudden current limiting in the BMS.

[0051] In this embodiment, real-time operating parameter data of the target battery is acquired. Then, a micro-short circuit event is determined based on a combination threshold of single-cell voltage change, internal resistance change, and local temperature change values ​​in the real-time operating parameter data. In response to the micro-short circuit event, the target current density and target temperature window for self-healing operation are determined based on the target battery's chemical system, health parameters, and current environmental conditions. Within the target current density and target temperature window, a phased combination of pulsed current and stable current is executed for self-healing operation, thereby effectively removing dendrites in the battery and restoring electrochemical balance, thus reducing the risk of micro-short circuits developing into hard short circuits or thermal runaway.

[0052] Furthermore, based on the above embodiments, if the battery is in the process of fast charging, the battery management system can easily detect signs of suspected single-cell micro-short circuits (such as millisecond-level voltage drops, decreases in equivalent internal resistance, and slight increases in local temperature). Specifically, the fast charging current itself is large, the electrode interface overpotential is high, concentration polarization is significant, and the thermodynamic driving force for dendrite nucleation and growth is stronger. If a self-healing pulse is directly superimposed, it may further aggravate local lithium plating or induce dendrite propagation. Moreover, the temperature rise and bus fluctuation caused by fast charging are already at a high level, and the self-healing pulse will introduce additional current disturbances and heat flux peaks, increasing the risk of thermal mismatch and bus ripple. In addition, the constant current / constant voltage loop on the charging pile side and the battery management system control on the vehicle side work simultaneously. If feedforward coordination is not established, forced intervention in self-healing may conflict with the pile-end control, easily leading to charging interruption or protection triggering.

[0053] To address this, after S103 and before S104, if it is determined that the target battery is in the constant current or constant voltage charging phase with the external charging device, the self-healing operation is not immediately initiated. Instead, a request is made to limit the charging current to form a stable observation window. Within this stable observation window, a continuous sequence of individual cell voltage changes, internal resistance changes, and local temperature changes is recorded using high-frequency sampling. This sequence is used for secondary confirmation of micro-short circuit events. The secondary confirmation includes determining the existence of a persistent micro-short circuit under fast charging conditions when the number of times the individual cell voltage changes, internal resistance changes, and local temperature changes continuously meet a combined threshold within a preset time period is not less than a preset number. This ensures that when suspected micro-short circuit symptoms appear under fast charging conditions, a stable observation window is established first, and high-frequency parameter acquisition and secondary confirmation are performed, avoiding misjudgment and over-intervention caused by directly triggering self-healing under high stress conditions.

[0054] If the original high-intensity self-healing pulse is directly superimposed under fast charging, it can easily cause local overheating, dendrite intensification, or conflict with the charging pile control, leading to charging interruption, protection triggering, or poor performance. Therefore, to address the aforementioned determination of a persistent micro-short circuit under fast charging conditions, a charging derating command can be sent to the external charging device to create a self-healing window within a preset duration. Within this window, a phased self-healing operation is performed, which includes lowering the upper limit of the high-rate current to no more than 3C, lowering the upper limit of the high-rate current application time to no more than 300 milliseconds, and setting the duration of the low-rate current to 2 to 4 seconds. This establishes a coordinated "self-healing window" after confirming the existence of a persistent micro-short circuit, and uses a degraded phased self-healing formula to implement controlled repair in the fast charging environment, reducing the risk of thermal and electrical disturbances.

[0055] Furthermore, since the constant current / constant voltage control at the charging pile end and the vehicle-side self-healing pulse may interfere with each other, if the pulse arrangement at the charging pile end is unknown to the vehicle side, current overshoot, increased bus ripple, or triggering of overcurrent protection can easily occur. Therefore, before performing the phased self-healing operation of degradation within the self-healing window, the predicted current trajectory and available power curve within the self-healing window can be transmitted between the battery management system and the external charging device. This allows the external charging device to perform current limiting and slope constraints within the self-healing window, thereby avoiding mutual interference between the charging loop and the self-healing operation, achieving vehicle-charging pile feedforward coordination, and avoiding control antagonism and overshoot.

[0056] Figure 2 This is a schematic diagram of a control system for a new energy battery, illustrated in an example embodiment of this application. Figure 2 As shown, the control system 200 for new energy batteries provided in this embodiment includes: The acquisition module 210 is used to acquire real-time operating parameter data of the target battery, including single cell voltage change value, internal resistance change value, and local temperature change value. Processing module 220 is used to determine a micro short circuit event based on a combined threshold of the single-cell voltage change value, the internal resistance change value, and the local temperature change value; The processing module 220 is also configured to, in response to the micro short circuit event, determine the target current density and target temperature window for self-healing operation based on the chemical system, health parameters and current environmental conditions of the target battery. The execution module 230 is configured to perform the self-healing operation, which is a combination of pulsed current and stable current, in stages within the target current density and the target temperature window.

[0057] Optionally, the combined threshold includes at least one combination of the following: the single-unit voltage change value being greater than the voltage change threshold, the internal resistance change value being less than the internal resistance change threshold, and the local temperature change value being greater than the temperature change threshold.

[0058] Optionally, the processing module 220 is specifically used for: The initial values ​​of the optimal current density and optimal temperature for dendrite dissolution are determined based on the chemical system of the target battery. The initial values ​​of the optimal current density and the optimal temperature are corrected based on the health parameters of the target battery to form corrected current density and corrected temperature. The corrected current density and the corrected temperature are adjusted according to the current environmental conditions to form the target current density and the target temperature window.

[0059] Optionally, the chemical system includes a ternary lithium battery system, a lithium iron phosphate battery system, and a solid-state battery system, and the initial values ​​of the optimal current density and the initial values ​​of the optimal temperature for different chemical systems are stored in a preset self-healing condition database.

[0060] Optionally, the execution module 230 is specifically used for: Within the target current density range, a pulse phase is entered, and high-rate current and low-rate current are applied alternately. The high-rate current is used to trigger the mechanical fracture of dendrites, and the low-rate current is used to control the mild electrochemical reaction on the dendrite surface. Within the target temperature window, the system enters a stable phase. Within the target temperature window, a constant rate current is applied and maintained for a preset time. The constant rate current is used to completely dissolve and reduce the dendrite residue.

[0061] Optionally, the high-rate current is an instantaneous charge-discharge current with a rate value greater than 3C and not exceeding 5C of the rated capacity of the target battery, used to induce local dissolution or fracture of the dendrite surface in a short time, wherein C is the current unit corresponding to the rated capacity of the target battery. The low-rate current is a moderate charge-discharge current with a rate value greater than 0.5C and not exceeding 1.5C of the rated capacity of the target battery, used to reduce internal pressure changes and suppress side reactions during dendrite dissolution. The constant rate current is a steady-state charge-discharge current with a rate value greater than 1C of the rated capacity of the target battery and not exceeding 2C of the rated capacity, used to maintain the electrochemical conditions required for complete dendrite dissolution within the target temperature window.

[0062] Optionally, the execution module 230 is specifically used for: First, maintain the high-rate current application time for no more than 500 milliseconds, then immediately apply the low-rate current for a duration between 1 and 3 seconds, alternating between 3 and 8 cycles; wherein the specific number of cycles is automatically adjusted according to the chemical system of the target battery.

[0063] Optionally, if the chemical system of the target battery is a ternary lithium battery system, the number of alternating cycles is set to 4 to 6 cycles; If the chemical system of the target battery is a lithium iron phosphate battery system, the number of alternating cycles is set to 3 to 5 cycles; If the chemical system of the target battery is a solid-state battery system, the number of alternating cycles is set to 5 to 8 cycles.

[0064] Optionally, the execution module 230 is specifically used for: The constant current rate is maintained for a period of not less than 3 minutes and not more than 10 minutes to ensure that the dissolved dendrite residue is completely electrochemically reduced within the target temperature window.

[0065] Figure 3 This is a schematic diagram of the structure of an electronic device according to an example embodiment of this application. For example... Figure 3 As shown, the electronic device 300 provided in this embodiment includes: a processor 301 and a memory 302; wherein: Memory 302 is used to store computer programs, and the memory may also be flash memory.

[0066] Processor 301 is used to execute the execution instructions stored in the memory to implement the various steps in the above method. For details, please refer to the relevant descriptions in the preceding method embodiments.

[0067] Alternatively, the memory 302 can be either standalone or integrated with the processor 301.

[0068] When the memory 302 is a device independent of the processor 301, the electronic device 300 may further include: Bus 303 is used to connect the memory 302 and the processor 301.

[0069] This embodiment also provides a readable storage medium storing a computer program, which, when executed by at least one processor of an electronic device, enables the electronic device to perform the methods provided in the various embodiments described above.

[0070] This embodiment also provides a program product including a computer program stored in a readable storage medium. At least one processor of an electronic device can read the computer program from the readable storage medium, and the at least one processor executes the computer program to cause the electronic device to perform the methods provided in the various embodiments described above.

[0071] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0072] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A control method for a new energy battery, characterized in that, include: Acquire real-time operating parameter data of the target battery, including changes in single-cell voltage, internal resistance, and local temperature. Micro-short circuit events are determined based on a combined threshold value of the individual cell voltage change, the internal resistance change, and the local temperature change. In response to the micro-short circuit event, the target current density and target temperature window for self-healing operation are determined based on the chemical system, health parameters, and current environmental conditions of the target battery. The self-healing operation, consisting of a phased combination of pulsed current and steady current, is performed within the target current density and target temperature window. 2.The control method for a new energy battery according to claim 1, characterized in that, The combined threshold includes at least one combination of the following: the single-unit voltage change value is greater than the voltage change threshold, the internal resistance change value is less than the internal resistance change threshold, and the local temperature change value is greater than the temperature change threshold. 3.The control method for a new energy battery according to claim 1, characterized in that, The step of determining the target current density and target temperature window for self-healing operation based on the target battery's chemical system, health parameters, and current environmental conditions includes: The initial values ​​of the optimal current density and optimal temperature for dendrite dissolution are determined based on the chemical system of the target battery. The initial values ​​of the optimal current density and the optimal temperature are corrected based on the health parameters of the target battery to form corrected current density and corrected temperature. The corrected current density and the corrected temperature are adjusted according to the current environmental conditions to form the target current density and the target temperature window.

4. The control method for a new energy battery according to claim 3, characterized in that, The chemical system includes ternary lithium battery system, lithium iron phosphate battery system and solid-state battery system, and the initial values ​​of the optimal current density and the initial values ​​of the optimal temperature for different chemical systems are stored in a preset self-healing condition database.

5. The control method for new energy batteries according to claim 1, characterized in that, Performing a phased self-healing operation combining pulsed current and steady current within the target current density and target temperature window includes: Within the target current density range, a pulse phase is entered, and high-rate current and low-rate current are applied alternately. The high-rate current is used to trigger the mechanical fracture of dendrites, and the low-rate current is used to control the mild electrochemical reaction on the dendrite surface. Within the target temperature window, the system enters a stable phase. Within the target temperature window, a constant rate current is applied and maintained for a preset time. The constant rate current is used to completely dissolve and reduce the dendrite residue.

6. The control method for new energy batteries according to claim 5, characterized in that, The high-rate current is an instantaneous charge-discharge current with a rate value greater than 3C of the rated capacity of the target battery and not exceeding 5C of the rated capacity, used to induce local dissolution or fracture of the dendrite surface in a short time, wherein C is the current unit corresponding to the rated capacity of the target battery. The low-rate current is a moderate charge-discharge current with a rate value greater than 0.5C and not exceeding 1.5C of the rated capacity of the target battery, used to reduce internal pressure changes and suppress side reactions during dendrite dissolution. The constant rate current is a steady-state charge-discharge current with a rate value greater than 1C of the rated capacity of the target battery and not exceeding 2C of the rated capacity, used to maintain the electrochemical conditions required for complete dendrite dissolution within the target temperature window.

7. The control method for new energy batteries according to claim 6, characterized in that, The alternating application of high-rate current and low-rate current includes: First, maintain the high-rate current application time for no more than 500 milliseconds, then immediately apply the low-rate current for a duration between 1 and 3 seconds, alternating between 3 and 8 cycles; wherein the specific number of cycles is automatically adjusted according to the chemical system of the target battery.

8. The control method for new energy batteries according to claim 7, characterized in that, The automatic adjustment of the specific number of rounds based on the chemical system of the target battery includes: If the chemical system of the target battery is a ternary lithium battery system, the number of alternating cycles is set to 4 to 6. If the chemical system of the target battery is a lithium iron phosphate battery system, the number of alternating cycles is set to 3 to 5 cycles; If the chemical system of the target battery is a solid-state battery system, the number of alternating cycles is set to 5 to 8 cycles.

9. The control method for new energy batteries according to claim 7, characterized in that, Applying a constant current rate within the target temperature window for a preset time includes: The constant current rate is maintained for a period of not less than 3 minutes and not more than 10 minutes to ensure that the dissolved dendrite residue is completely electrochemically reduced within the target temperature window.

10. A control system for new energy batteries, characterized in that, include: The acquisition module is used to acquire real-time operating parameter data of the target battery, including single cell voltage change value, internal resistance change value, and local temperature change value. The processing module is used to determine a micro-short circuit event based on a combined threshold of the single-cell voltage change value, the internal resistance change value, and the local temperature change value; The processing module is also used to respond to the micro short circuit event by determining the target current density and target temperature window for self-healing operation based on the chemical system, health parameters and current environmental conditions of the target battery. An execution module is configured to perform the self-healing operation, which combines a phased pulse current with a stable current, within the target current density and the target temperature window.

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