153 results about "Overcharge" patented technology

The invention provides an interactive control system and method for a power module and an overcharge pile, a storage medium and a computer program product, and the method comprises the steps: obtaining a charging control parameter according to the input time sequence state data of a battery through a charging control parameter prediction model based on deep learning; generating a power instruction according to the charging control parameter and sending the power instruction to the power module; after the power supply module executes the power instruction, an instruction execution result and battery state data are transmitted back to the overcharge pile main control software; and the overcharge pile main control software adjusts the weight of the charging control parameter prediction model according to the received data or regenerates a power instruction based on the latest battery time sequence state data. According to the invention, the charging time can be shortened, the risks of overheating, overcharging and the like can be prevented, different battery states and complex working conditions can be adapted, and the real-time requirement of an overcharging scene on a control instruction and state data can be met.

The invention belongs to the technical field of lithium ion battery safety, and provides a lithium ion battery overcharge damage risk early warning method and system, and the method comprises the steps: obtaining the voltage, current, capacity and other data of a lithium ion battery sample in an abnormal working condition test; based on a physical and chemical reaction mechanism in the battery, establishing an electrochemical-thermal coupling damage model of the lithium ion battery; identifying key parameters by using the electrochemical parameters, solving the change of the key parameters in the battery damage evolution process, constructing a damage degree quantitative evaluation model, and calculating the damage degree of the target battery according to the quantitative relationship between the electrochemical parameters and the battery damage degree; and configuring a decommissioning damage threshold according to the capacity attenuation, the battery health state and the side reaction to the battery performance degradation mechanism, comparing the damage degree of the target battery with the decommissioning damage threshold, determining the damage risk level of the target battery, and performing early warning. The method can achieve the quantitative evaluation of the damage degree of the battery, and provides a scientific basis for decommissioning decision.

The invention provides a power battery anti-overcharge method and system of a fuel cell automobile and a vehicle, and the power battery anti-overcharge method of the fuel cell automobile comprises the steps: judging whether a power battery has an overcharge risk or not based on the working condition of the whole automobile and the real-time state of the power battery; if the overcharge risk exists, controlling the fuel cell system to reduce the output power; if the output power is reduced to the lowest stable operation power and the net output power is still higher than the current allowable maximum charging power of the power battery, the fuel cell system is controlled to enter a self-consumption mode, and the electric energy generated by the fuel cell system is guided to an internal auxiliary machine for auxiliary consumption; and maintaining the net output power not to be greater than the current allowable maximum charging power. The overcharge risk when the charging capacity of the battery is reduced due to low temperature or energy recovery is effectively solved, direct shutdown is replaced by intelligent hierarchical control, the start-stop frequency of the fuel battery is remarkably reduced, the service life of the fuel battery is prolonged, and the economical efficiency of the whole vehicle is improved.

The invention relates to the technical field of artificial intelligence, in particular to an electrochemical energy storage battery overcharge safety early warning method based on a large model, which comprises the following steps: collecting a literature data set, an experiment data set, an expert experience set and phenomenon description information; then, energy storage mechanism entities are extracted through a BERT-NER algorithm, and a mechanism map is constructed in a pairing mode; collecting energy storage bin detector data in real time, calculating a time sequence characteristic change rate, and generating a detection cue word in combination with phenomenon description; and inputting the mechanism graph and the cue word into a large language model for training, and generating a prediction result. According to the method, multi-source data are fused, the overcharge risk is effectively early warned through large model analysis, and safe operation of the electrochemical energy storage battery is ensured.

The invention discloses a method for carrying out overcharge protection by utilizing a voltage change rate, which comprises the steps of S1, monitoring the voltage change rate in real time, S2, carrying out data analysis processing and early warning, S3, processing an abnormal condition, S4, carrying out settlement comparison on a recorded result and the like, so as to obtain an abnormal result of the voltage change rate of a battery. According to the method, by monitoring the voltage change rate of the battery in real time, the abnormal performance of the battery can be found in time, the real-time performance and the accuracy of battery testing are improved, the safety and the reliability of the battery can be guaranteed, early warning can be carried out on the overcharge condition of the battery, and potential safety hazards caused by overcharge and overdischarge of the battery due to personnel errors are prevented; and meanwhile, the service life of the battery is ensured, and the abnormity of the voltage change rate can be found in time, so that the battery failure is effectively prevented, the use safety and reliability of the battery are improved, and the safety of testers is also ensured.

The invention discloses a battery overcharge aging detection method and device, electronic equipment and a medium, relates to the field of power electronics, and considers that the capacity and the ohmic internal resistance of a battery in the charging and discharging process change continuously, the ohmic internal resistance of the battery is iterated in real time by using a particle swarm algorithm in the scheme. The most accurate current ohmic internal resistance in the ohmic internal resistance iterated by the particle swarm algorithm is determined according to the current end voltage and the current end current detected in real time in the unit constant-current charging and discharging period; the change rate of the capacity peak value of the battery and the relative change rate of the internal resistance capacity are obviously different from those in a normal aging condition, so that the change rate of the capacity peak value of the battery and the relative change rate of the internal resistance capacity need to be determined, and the overcharge aging degree of the battery is further determined. According to the scheme, the overcharge aging degree of the battery can be accurately determined without disassembling the battery.

The invention relates to the technical field of battery replacement cabinet charging detection, and provides a charging detection method and system for batteries of a battery replacement cabinet. The method comprises the following steps: setting initial parameters according to layout information of a charging bin of a battery changing cabinet; determining a candidate strategy based on the initial parameters in combination with voltage overcharge protection and current overcurrent protection conditions; based on a candidate strategy, configuring a first regulation and control vector in a gain space in a stepped manner by direct-current voltage, and configuring a second regulation and control vector in a digital space in a stepped manner by a pulse width duty ratio; establishing a charging strategy search space through the two types of regulation and control vectors; and performing Pareto screening in the space to obtain a service life, efficiency and safety performance non-dominated solution set, and determining an optimal strategy, so as to solve the technical problem that safety, charging efficiency and cycle life optimization are difficult to consider in the charging process of the battery of the battery changing cabinet, and achieve the purposes of constructing a charging strategy search space through a multi-dimensional regulation and control vector and performing Pareto screening to obtain a charging strategy. The technical effects of prolonging the charging and discharging service life, improving the charging efficiency and improving the safety performance are achieved.

The invention relates to the technical field of lithium batteries, and provides a lithium battery overcharge protection control method and system, and the method comprises the steps: obtaining a voltage value, a voltage change rate, a temperature value and a temperature change rate of each battery cell in a lithium battery, carrying out the interval consistency correction, constructing a battery cell state data set and a change trend feature set, carrying out the state trend analysis, and obtaining a state data set; obtaining the current risk grade and the composite risk factor value of each battery cell, matching the composite risk factor value with the current risk grade to obtain a charging adjustment instruction set, and adjusting a charging control module of the lithium battery according to the charging adjustment instruction set. Through trend analysis, temperature rise change in a future charging period is accurately simulated, and critical proximity and abnormal probability are evaluated in combination with a temperature rise safety interval, so that early warning is realized, real-time control of charging current limiting and voltage amplitude limiting is realized, and the problem of protection delay or excessive protection in a complex battery environment in the prior art is solved.

The invention relates to the technical field of lithium battery charging equipment, in particular to an overcharge protection lithium battery charger which comprises a shell, a charging protection board circuit and an output power port. The charging protection board circuit is provided with a monitoring protection module, a mechanical protection module and a logic control module. The monitoring protection module accurately identifies an overcharge abnormal state by measuring a lithium battery AC impedance spectrum in real time, and rapidly triggers the electronic protection unit to execute a cut-off action. And if the electronic protection fails, the mechanical protection module acts quickly, and the charging loop is physically disconnected. The logic control module coordinates automatic switching of the two protection modes, and the intelligence and reliability of protection are improved. The lithium battery charger is simple and reasonable in structure, high in monitoring sensitivity and rapid and reliable in protection action, has a perfect redundancy protection structure and a convenient reset mechanism, effectively overcomes the defects in the prior art, and remarkably improves the safety performance and reliability of the lithium battery charger.

The invention discloses an electric container truck overcharge facility collaborative planning method considering traffic network-power grid interaction, and the method comprises the steps: building a charging demand space distribution model according to the energy consumption heterogeneity characteristics of multiple types of transportation tasks of an electric container truck; a node marginal electricity price mechanism is introduced, and a charging station selection equalization model with the purpose of total cost minimization is established; based on a direct current optimal power flow model theory, constructing a power distribution network operation model taking the minimization of the total power generation cost as a target; the method comprises the following steps: constructing an electric container truck overcharge facility collaborative planning model considering traffic-power network interaction, carrying out conversion processing on the model to obtain a plurality of differentiable obstacle sub-problems, and solving the plurality of differentiable obstacle sub-problems by using an interior point method to obtain a traffic network-power network interaction overcharge facility optimization setting scheme. According to the method, the problem of collaborative optimization of charging facility deployment and power grid impact in electric transformation in the field of port collection and distribution is solved, efficient and stable collaborative decision support is provided for port electric container truck charging network planning, and the method has remarkable application value.

The utility model relates to the technical field of batteries, and discloses an over-current fusing structure for avoiding secondary contact and a battery, the over-current fusing structure for avoiding secondary contact comprises a connecting sheet which is electrically connected with a battery cell and a busbar, the connecting sheet is provided with a fusing part which is fused when the current exceeds a set value, and the fusing part is provided with an insulated fixing piece; when the battery is abnormal in the using process, such as over-charging or over-discharging, the current passing through the connecting piece is too large instantly, or when the current passing through the fusing part exceeds a set value in the using process of the battery, the fusing part is fused, so that the electrical connection between the battery core and the outside is cut off, and after the fusing part is fused, the battery can be quickly maintained and replaced, and meanwhile, the service life of the battery is prolonged. And after the fusing part is fused, the fixing piece arranged on the fusing part is used for connecting and fixing the connecting sheet, and the fixing piece is insulated, so that the secondary electrical connection contact of the battery cell is avoided, and greater harm is avoided, and the fused connecting sheet can be quickly disassembled and replaced.

The invention provides a model training method, a battery cell overcharge detection method and related equipment, and relates to the technical field of battery cell detection. The training method comprises the following steps: acquiring performance data of a battery cell sample and a corresponding overcharge test result; feature extraction is carried out on the performance data of the battery cell sample, a first feature set is constructed, and the first feature set is used for representing features determined according to the performance data of the battery cell sample; screening features meeting a preset correlation condition with the overcharge test result from the first feature set, and constructing a second feature set; screening features of which the feature contribution degrees exceed a preset contribution degree threshold value from the second feature set, and constructing a third feature set; and training the to-be-trained overcharge detection model based on the features in the third feature set and the corresponding overcharge test result, and if a training stop condition is satisfied, obtaining a target overcharge detection model so as to perform overcharge prediction by using the target overcharge detection model.

The invention discloses an overcharge system and a control method thereof, and relates to the technical field of charging. The system comprises a multi-winding transformer, at least two charging modules and at least two charging interfaces, one end of each charging module is correspondingly connected with a secondary winding of the multi-winding transformer, and the other end of each charging module is correspondingly connected with at least one charging interface; the charging module comprises a first charging unit, M second charging units, a first switch unit and a second switch unit, one end of the first charging unit and one end of each second charging unit are connected with the corresponding secondary winding, and the other end of the first charging unit is connected with each charging interface corresponding to the charging module through the first switch unit; the other end of each second charging unit is connected with a charging interface corresponding to the charging module through a second switch unit; wherein the first charging unit is a two-stage transformation topology, and the second charging unit is a single-stage transformation topology. Therefore, the charging efficiency of the overcharging system is improved.

The invention is suitable for the field of power distribution network optimization scheduling, and discloses a day-ahead-day collaborative management and control method, system and device considering distribution network overcharge load fluctuation stabilization and a high-quality power supply target, and a medium, and the method comprises the steps: obtaining EV parameters, and employing a Monte Carlo method to simulate multiple types of EV loads; on the basis of the EV load, taking system operation economic optimization as an objective function, constructing a day-ahead optimization model in combination with multi-type constraints, and obtaining output instructions of OLTC, CB, a storage battery, photovoltaic and a super capacitor as day-ahead optimization results through a Gurobi solver; based on the updated EV load and the day-ahead optimization result, taking system economy and node voltage deviation as objective functions, combining the multi-type constraints, constructing an intra-day optimization model, obtaining optimized photovoltaic and super capacitor output instructions through a Gurobi solver, and combining output instructions of OLTC, CB and a storage battery to complete day-ahead-intra-day collaborative management and control. Source load fluctuation is stabilized, the service life of a storage battery is prolonged, and safe and economical operation of a power distribution network is promoted.

The utility model provides an overcharge energy storage container. The system comprises a box body, an energy storage module, an overcharge host and electrical equipment. The energy storage module is arranged in the battery cabin; the energy storage module comprises a plurality of stacked battery packs; and the over-charging host is arranged in the over-charging cabin. And the overcharge host is electrically connected with the energy storage module. And the electrical equipment is arranged in the equipment cabin. The electrical equipment comprises an energy storage converter and a power distribution cabinet, the energy storage converter is electrically connected with the energy storage module, and the power distribution cabinet is electrically connected with the overcharge host. The over-charge energy storage container can realize an over-charge function, greatly shortens the charging implementation, and improves the charging efficiency.

The present application provides a data line charging protection method, system, device, and storage medium. The method extracts charging information and overcharge information of a target data line in a normal charging state from historical charging data, determines the steady-state reference value of the voltage when the target data line switches from an overcharge state to a normal charging state through all safety margins, determines the load limit value of the voltage when the target data line switches from a normal charging state to an overcharge state through the overcharge information and the trickle charging data of the target data line in a trickle charging state, converts the load limit value into an overcharge threshold through a critical compensation value, and safely switches the charging state of the target data line during the charging process based on the steady-state reference value and the overcharge threshold. The above scheme provides overcharge protection for the data line charging process based on charging state switching, can realize dynamic overcurrent switching of the data line charging state, and can improve the anti-interference performance of the automatic step jump when the data line charging reaches equilibrium.

The present application belongs to the technical field of lithium ion battery safety, and provides a lithium ion battery overcharge damage risk early warning method and system, obtains voltage, current and capacity data and the like of a lithium ion battery sample in abnormal working condition test testing; based on the internal physical and chemical reaction mechanism of the battery, a lithium ion battery electrochemical-thermal coupling damage model is established; key parameters are identified using the same, the change of the key parameters in the battery damage evolution process is solved, a damage degree quantitative evaluation model is constructed, the damage degree of the target battery is calculated according to the quantitative relationship between the electrochemical parameters and the battery damage degree; according to the capacity attenuation, the battery health state and the battery performance deterioration mechanism of the side reaction, the retirement damage threshold value is configured, the damage degree of the target battery is compared with the retirement damage threshold value, the damage risk grade of the target battery is determined, and early warning is carried out. The present application can realize quantitative evaluation of the battery damage degree, and provide a scientific basis for retirement decision.

The invention relates to the technical field of new energy vehicle overcharge prevention, and discloses a new energy vehicle charging overcharge prevention mechanism which comprises a vehicle body, a charging gun insertion core and an access insertion core and further comprises an insertion opening formed in the vehicle body. And the connecting seat is connected to the interior of the jack in a sliding manner and is fixedly connected with the access insertion core. The charging current change is sensed in real time through the current sensing coil, the mechanical locking and releasing action is directly driven through the current magnetic effect, when the battery is nearly fully charged and the charging current is reduced to a preset threshold value, the magnetic field intensity is reduced, and the ejector pin is rapidly reset under the elastic effect of the second spring to trigger the trigger part; the automatic separation of the charging gun insertion core and the access insertion core is realized, and the over-charging phenomenon is effectively prevented.

The invention discloses an overcharge lithium ion battery electrolyte and a battery, and relates to the technical field of lithium ion batteries. The electrolyte comprises a lithium salt, a non-aqueous solvent and an additive, wherein the additive comprises a first additive and a second additive; the non-aqueous solvent includes a first solvent. The low-viscosity first solvent is introduced into the electrolyte, so that the viscosity of the electrolyte is reduced, the conductivity and the rate capability are improved, meanwhile, the first additive and the second additive are also added to achieve a synergistic effect, and the defect of high-temperature instability caused by the electrolyte is improved while the conductivity of the electrolyte is improved and the viscosity of the electrolyte is reduced. The electrolyte is used for the lithium ion battery, and the battery has excellent rate capability brought by a low-viscosity solvent and excellent high-temperature performance brought by the synergistic effect of the electrolyte and an additive.

An integrated protection method for a flow battery energy storage system belongs to the technical field of flow battery systems, and comprises the following steps: S1, adopting a layered architecture design for a system architecture; s2, adopting a multi-stage protection mechanism through a safety and fault management scheme designed based on a system architecture design thought; S21, constructing a battery over-charge / over-discharge protection function; s22, constructing a thermal runaway early warning, and triggering a shutdown function; and S23, three-level safety protection is set between the PCS and the BMS. On the basis of BMS and PCS cooperative control, strategy optimization is implemented, the efficiency and safety of the integrated energy storage system can be remarkably improved, a control algorithm such as self-adaptive PID adjustment is improved, the charging and discharging process can be accurately balanced, and the overload or undervoltage risk is prevented. The collaborative design ensures seamless matching of the battery state and the power output, and provides reliable support for an overall energy storage scheme.

This invention relates to the field of artificial intelligence technology, and more particularly to a method for overcharge safety early warning of electrochemical energy storage batteries based on a large model. The method includes collecting literature datasets, experimental datasets, expert experience sets, and phenomenon description information; then, using the BERT-NER algorithm to extract energy storage mechanism entities and constructing a mechanism map; real-time acquisition of energy storage chamber detector data, calculation of time-series feature change rates, and generation of detection prompt words based on phenomenon descriptions; and inputting the mechanism map and prompt words into a large language model for training to generate prediction results. This invention integrates multi-source data and effectively warns of overcharge risks through large model analysis, ensuring the safe operation of electrochemical energy storage batteries.

The invention discloses a battery monomer, a battery device, an energy storage device and a power utilization device. A battery includes a housing, an electrode assembly, and an overcharge protection mechanism. The shell is provided with a first wall, the electrode assembly is arranged in the shell, and the overcharge protection mechanism is arranged on the first wall. Wherein the electrode assembly comprises a gas generating agent, and the gas generating agent comprises at least one of carbonate, oxalate or chlorate. According to the technical scheme provided by the invention, the reliability of the battery device can be effectively improved.

The invention discloses a loop disconnecting device for thermal runaway caused by a battery module overcharge test and an overcharge test method, and belongs to the technical field of battery safety test. The device comprises a base, at least one pair of separable connecting blocks which are arranged at the two ends of the base and stacked up and down, a pressing block unit used for pressing or loosening the connecting blocks, and a control unit used for controlling the state of the pressing block unit. The control unit has a locking state and an unlocking state and is matched with the lock rod on the main pressing rod through a sliding module capable of sliding horizontally, a locking block set arranged in a locking groove of the sliding module and a triggering mechanism driven by an electromagnet, and mechanical locking is achieved. When thermal runaway occurs in the overcharge test of the battery module, the electromagnet can be triggered to act and unlock through a remote electric signal, so that the pressing block unit quickly bounces under the action of the reset spring, and the test loop is instantly disconnected. The device further has a standby mechanical triggering function, and can be forcibly operated to be disconnected when electric control fails.

The invention discloses an energy storage system power distribution method and system of a grid-connected point, a medium and equipment, and belongs to the technical field of automatic voltage control of a power system, and the method comprises the steps: monitoring the per unit value of the voltage of the grid-connected point and the charge state of an energy storage system in real time; according to a preset voltage threshold value and a charge state threshold value, dividing the grid-connected point voltage per unit value and the charge state of the energy storage system to obtain a plurality of operation condition intervals; for different operation condition intervals, dynamically selecting a preset target function and a corresponding constraint condition combination, and based on the selected target function combination and the constraint condition combination, carrying out iterative calculation to obtain a power adjustment amount of the energy storage system; and controlling the energy storage system to execute power distribution according to the power adjustment amount. Therefore, by implementing the method, the problems of low voltage treatment efficiency and easy overcharge / overdischarge of the energy storage system due to the fact that the difference between the per unit value of the grid-connected point voltage and the energy storage charge state is not comprehensively considered in the prior art can be solved.

This invention discloses a method and system for early warning of overcharge in lithium batteries based on dynamic impedance spectroscopy and relaxation time distribution. During charging, an AC disturbance signal is superimposed, and voltage, current response, and state of charge (SOC) are collected. After removing DC drift from the voltage, the dynamic electrochemical impedance spectroscopy (DIS) is calculated. DIS within a specific SOC range is extracted, and model-free decoupling is achieved using relaxation time distribution (DRT) technology to identify low-frequency relaxation peaks related to limited solid-phase diffusion of lithium ions in the negative electrode. The shift characteristics of this peak with SOC are tracked to determine the warning SOC point and its characteristic frequency. The complex impedance of different SOCs at the characteristic frequency is extracted, and the Euclidean distance between the complex impedances of adjacent SOCs is calculated. When the Euclidean distance meets the warning condition, a warning signal is output. This invention decouples DIS using DRT, accurately identifies microscopic precursors of limited diffusion, solves the problems of feature overlap and response lag, and achieves sensitive and rapid early warning.

A battery cell, a battery device, an energy storage device, and an electric device. The battery comprises a casing, an electrode assembly, and an overcharge protection mechanism. The casing comprises a first wall, the electrode assembly is arranged in the casing, and the overcharge protection mechanism is arranged on the first wall. The electrode assembly comprises a gas-generating agent, and the gas-generating agent comprises at least one of carbonate, oxalate or chloride. The battery cell can effectively improve the reliability of the battery device.

The invention discloses a control method and device for adaptively adjusting overcharge current and a vehicle, and the method comprises the steps: obtaining the initial temperature of a battery cell of a battery pack and the initial electric quantity of the battery pack when a vehicle gun insertion charging signal is received; if the initial temperature of the battery cell is in a first temperature interval and the initial electric quantity is smaller than or equal to first preset electric quantity, cooling is carried out, the battery pack is charged according to a preset minimum current value, and when the charging duration is equal to first preset duration, a dynamic charging step is executed: the current temperature and the current residual electric quantity of the battery cell are obtained; controlling the operation state of the thermal management system according to the current temperature, determining a charging request current required by the battery pack according to the current temperature and the current residual electric quantity, and performing charging based on the charging request current to obtain the current residual electric quantity after charging; and repeatedly executing the dynamic charging step until the current residual electric quantity reaches the preset electric quantity. According to the method, the temperature rise problem of the battery pack in the overcharge process is effectively controlled.

A battery pack overcharge diagnosis method, overdischarge diagnosis method, and device relate to the technical field of battery management systems. The method includes: setting at least one overcharge level, each overcharge level corresponding to a first voltage threshold and a first capacity threshold; obtaining the maximum voltage of all cells in the battery pack; when the maximum voltage is greater than or equal to the second voltage threshold, the absolute value of the battery pack current is less than or equal to the first current threshold, and the duration reaches a first preset time, integrating the battery pack current in ampere hours; if the absolute value of the capacity increase obtained by the integration is greater than or equal to the first capacity threshold corresponding to a certain overcharge level, the battery pack is determined to be overcharged at that overcharge level; when the maximum voltage is greater than the first voltage threshold corresponding to any overcharge level, the battery pack is determined to be overcharged at that overcharge level. This application combines voltage and capacity to diagnose whether it is overcharged or overdischarged, which can effectively reduce the probability of misjudgment or missed judgment and improve the accuracy and reliability of diagnosis.

The invention relates to the technical field of lithium battery protection, and discloses a high-safety lithium battery overcharge protection device which comprises a lithium battery charging mechanism, the middle position of the lithium battery charging mechanism is connected with an overcharge protection mechanism, the lithium battery charging mechanism comprises a positioning protection frame, and the middle position of the positioning protection frame is connected with a charging connection base. A limiting groove is formed in one side of the positioning protection frame; according to the invention, current input can be rapidly and thoroughly cut off when overcharge or current abnormity is detected; the driving motor drives the eccentric control frame to rotate through transmission of the positioning shaft and the positioning gear, so that the lifting protection frame, the power connection limiting frame and the protection frame are stably and quickly jacked up and move upwards; the charging plug of the lithium battery unit is quickly separated from the charging connection base, so that the complete power-off treatment of the lithium battery unit is realized; according to the design, the influence of continuously input micro current on the lithium battery unit is effectively avoided, the service life of the lithium battery is remarkably prolonged, and the charging safety of the lithium battery is remarkably improved.

The invention relates to a secondary battery and an electric device. The embodiment of the invention provides a secondary battery. The secondary battery comprises a shell, an electrode assembly, an overcharge protection mechanism and electrolyte, the housing has a first surface. The electrode assembly is arranged in the shell; the overcharge protection mechanism is arranged on the first surface; and the electrolyte comprises a gas generating agent. The gas generating agent can react and generate gas when the response voltage is reached; the secondary battery can trigger the overcharge protection mechanism by the gas when the overcharge voltage reaches the response voltage. According to the technical scheme, the gas generating agent is added into the electrolyte, polymerization reaction can be carried out and gas can be generated when the overcharge voltage reaches the response voltage, and the overcharge protection mechanism is triggered; therefore, the short-circuit part of the secondary battery acts earlier, the short-circuit protection time is advanced, the thermal runaway of the secondary battery caused by a large amount of heat generated by decomposition of the main material of the battery is greatly reduced, and the thermal runaway probability of the secondary battery is reduced more favorably.