Method and system for rapidly screening defective batteries

Abstract

The invention relates to the technical field of battery detection, in particular to a rapid defective battery screening method and system.The rapid defective battery screening method comprises the steps that firstly, a target battery to be detected is subjected to high-temperature and high-rate charging treatment, and after the high-temperature and high-rate charging treatment is completed, the target battery to be detected is subjected to at least one time of high-temperature and low-current charging treatment; after the high-temperature low-current charging treatment is completed, carrying out high-temperature shelving treatment on the target battery to be detected, and carrying out continuous voltage monitoring on the target battery to be detected in the high-temperature shelving process; and finally, performing defect screening on the target battery to be detected according to the monitored voltage data. Through high-temperature high-rate charging, high-temperature low-current charging and high-temperature shelving treatment, in combination with continuous voltage monitoring, defective batteries can be quickly and accurately screened out, the battery screening time is greatly shortened, the screening efficiency is improved, meanwhile, the screening accuracy is ensured, and the situation that the defective batteries flow into the market is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a method and system for quickly screening defective batteries. Background Art

[0002] The safety of new energy vehicles is the cornerstone of the development of the entire new energy vehicle industry. As the core component of new energy vehicles, the safety of lithium-ion batteries is particularly important.

[0003] The existence of defects inside a single battery is one of the important factors for its thermal runaway. There are four short-circuit modes inside a single battery cell, namely positive electrode material-negative electrode material, positive electrode material-negative electrode copper foil, positive electrode aluminum foil-negative electrode material, and positive electrode aluminum foil-negative electrode copper foil. Among them, the short-circuit mode of positive electrode aluminum foil-negative electrode material (referred to as Al-material short circuit) generates the highest heat at the moment of short circuit, so it is usually the main cause of thermal runaway of battery cell fire. There are currently two commonly used detection methods. One is to adjust the battery's state of charge to around 70% SOC after the constant capacity is completed, and then detect the lithium plating coupled Al-material defects that may exist in the battery. The detection rate is only 15%. Defective batteries are likely to flow out to the client, which greatly increases the risk of safety accidents. The other is to combine multi-day long-term detection at high and low temperatures when the battery's state of charge reaches a high SOC. This detection method has a 100% detection rate for lithium plating coupled Al-material short-circuit defects. However, it is calculated in days, and the detection time is relatively long, affecting production efficiency and cost expenditure.

[0004] It can be seen that the currently commonly used detection methods have the defects of low detection rate of defective batteries, too long time consumption and affecting production efficiency. Summary of the invention

[0005] In view of this, the present invention provides a method and system for rapid screening of defective batteries to solve the problems of low detection rate of defective batteries, long time consumption and impact on production efficiency in the currently commonly used detection methods.

[0006] In a first aspect, the present invention provides a method for rapid screening of defective batteries, the method comprising:

[0007] Obtain the target battery to be tested;

[0008] Performing high-temperature and high-rate charging treatment on the target battery to be tested;

[0009] After the high-temperature and high-rate charging process is completed, the target battery to be tested is subjected to at least one high-temperature and low-current charging process;

[0010] After the high-temperature and low-current charging treatment is completed, the target battery to be tested is subjected to a high-temperature shelf treatment, and the voltage of the target battery to be tested is continuously monitored during the high-temperature shelf process;

[0011] According to the monitored voltage data, defect screening is performed on the target battery to be inspected.

[0012] The above scheme can quickly and accurately screen out defective batteries through high-temperature high-rate charging, high-temperature low-current charging and high-temperature shelving treatment, combined with continuous voltage monitoring, greatly shortening the battery screening time and improving the screening efficiency. At the same time, it ensures the accuracy of screening, helps to reduce the flow of defective batteries into the market and improve the overall quality of battery products.

[0013] In an optional implementation, before performing high-temperature and high-rate charging on the target battery to be inspected, the method further includes:

[0014] Based on the target voltage value, a charge adjustment process is performed on the target battery to be detected, so as to adjust the state of charge of the target battery to be detected to the target voltage value.

[0015] The above scheme adjusts the charge state of the target battery to be tested to the target voltage value through charge adjustment processing, thereby ensuring the consistency and comparability of subsequent charging processing and improving the accuracy of the screening results.

[0016] In an optional implementation, the step of performing charge adjustment processing on the target battery to be detected based on the target voltage value to adjust the state of charge of the target battery to be detected to the target voltage value includes:

[0017] Acquire the current voltage value of the target battery to be tested, and compare the current voltage value with the target voltage value;

[0018] If the current voltage value is higher than the target voltage value, a charge adjustment process is performed on the target battery to be detected, so as to adjust the charge state of the target battery to be detected to the target voltage value.

[0019] The above scheme compares the current voltage value with the target voltage value, and only performs load adjustment when the current voltage value is higher than the target voltage value, thereby avoiding unnecessary energy consumption and battery loss and improving the economy and efficiency of screening.

[0020] In an optional implementation, the step of performing high-temperature and high-rate charging on the target battery to be tested includes:

[0021] In a target high temperature environment, a step-by-step high-temperature high-rate charging process is performed on the target battery to be inspected with a first variable charging current.

[0022] In an optional implementation, the stepwise high-temperature high-rate charging process of the target battery to be tested with a first variable charging current includes:

[0023] Using 80% to 200% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a first-stage high-temperature high-rate charging process to increase the state of charge of the target battery to be tested to 80% of the rated capacity;

[0024] Using 20% ​​to 50% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a second-step high-temperature high-rate charging process to increase the state of charge of the target battery to be tested to 90% of the rated capacity;

[0025] The target battery to be tested is charged at a third level of high temperature and high rate using 10% to 30% of the rated capacity of the target battery to be tested as a charging current, so as to increase the state of charge of the target battery to 100% of the rated capacity.

[0026] The above scheme uses different charging currents at different stages for step-by-step charging, which can better adapt to the charging needs of the battery at different states of charge, avoid excessive impact on the battery during the charging process, and reduce battery damage or detection errors caused by improper charging. By reasonably setting the charging current and stage, it is more conducive to stimulating potential defect reactions inside the battery, making the defects easier to expose during the charging process, thereby improving the effectiveness of defective battery detection and helping to more accurately screen out problematic batteries.

[0027] In an optional implementation, performing at least one high-temperature and low-current power replenishment treatment on the target battery to be detected includes:

[0028] In a target high temperature environment, based on a target number of power replenishments, a first power replenishment current is used to perform high temperature and low current power replenishment processing on the target battery to be detected; a current range of the first power replenishment current is 5% to 15% of the rated capacity of the target battery to be detected, and a range interval of the target number of power replenishments is 1 to 10 times.

[0029] The above scheme uses a small current to replenish power multiple times in a high temperature environment, which can promote the growth of lithium deposition tips, make lithium dendrites more likely to pierce the diaphragm, accelerate the development of defects such as short circuits that may exist inside the battery, and increase the probability of abnormal self-discharge and other characteristics of defective batteries during subsequent storage, thereby improving the accuracy of detection. Small current replenishment is relatively mild, which can have a certain impact on the internal structure of the battery to assist in detection, and will not cause additional damage to the battery due to excessive current or cover up the actual defects of the battery, which helps to detect battery defects more accurately.

[0030] In an optional implementation, the step of subjecting the target battery to be tested to a high temperature standby treatment includes:

[0031] In a target high temperature environment, the target battery to be tested is subjected to a high temperature shelving treatment based on a target time period; the target time period ranges from 6 hours to 12 hours.

[0032] The high-temperature storage treatment of the above scheme provides enough time for the physical and chemical reactions inside the battery, so that lithium back-insertion occurs in the lithium precipitation area, resulting in graphite expansion, which further causes lithium dendrites to pierce the diaphragm, causing short circuits between the aluminum foil and the negative electrode material, and other defects to be more obviously manifested as voltage changes, thereby improving the reliability of defect detection. The determined high-temperature storage time range ensures the consistency and stability of the detection conditions, which is conducive to establishing a unified defect judgment standard.

[0033] In an optional implementation, the defect screening of the target battery to be inspected according to the monitored voltage data includes:

[0034] Calculating the target voltage drop rate of the target battery to be tested during the high-temperature storage process according to the monitored voltage data;

[0035] Obtaining a standard value of a voltage drop rate of a normal battery under the same conditions as the target battery to be tested;

[0036] If the target voltage drop rate is greater than the target multiple of the voltage drop rate standard value, the target battery to be inspected is determined to be a defective battery.

[0037] The above scheme can intuitively and accurately reflect the performance status of the battery by calculating the voltage drop rate and comparing it with the standard value, which helps to quickly screen out defective batteries.

[0038] In an optional implementation, the defect screening of the target battery to be inspected according to the monitored voltage data includes:

[0039] Based on the monitored voltage data, a first curve distribution of voltage variation over time of the target battery to be tested during high temperature storage is obtained;

[0040] Obtaining a second curve distribution of voltage variation over time of a normal battery under the same conditions as the target battery to be tested;

[0041] If the first curve distribution continuously deviates from the second curve distribution after the target time point, it is determined that the target battery to be inspected is a defective battery.

[0042] By comparing the voltage curve distributions of the target battery to be tested with those of normal batteries, the above scheme can more comprehensively evaluate the performance and status of the battery, thereby improving the accuracy and reliability of screening.

[0043] In an optional embodiment, the temperature range of the target high temperature environment is 35°C to 100°C.

[0044] The above scheme sets a reasonable temperature range to simulate the working environment of the battery in actual use, while avoiding the adverse effects of excessively high or low temperatures on battery performance.

[0045] In an optional embodiment, the temperature range of the target high temperature environment is 55°C to 65°C.

[0046] The above scheme is screened within the temperature range of 55°C to 65°C, which can more accurately reflect the performance of the battery at high temperatures and help discover potential performance problems and defects.

[0047] In a second aspect, the present invention provides a rapid screening system for defective batteries, the system being applied to the method as described above, the system comprising: a charge and discharge tester and a temperature control device;

[0048] The temperature control device is used to provide a target high temperature environment for the target battery to be tested, and the charge and discharge tester is used to perform a charging operation of a high-temperature high-rate charging treatment and a charging operation of a high-temperature small-current charging treatment on the target battery to be tested in sequence.

[0049] In a third aspect, the present invention provides a fast screening device for defective batteries, a target battery acquisition module for acquiring a target battery to be detected, for acquiring a target battery to be detected;

[0050] A high-temperature and high-rate charging processing module is used to perform high-temperature and high-rate charging processing on the target battery to be tested;

[0051] A high-temperature, low-current charging processing module is used to perform at least one high-temperature, low-current charging processing on the target battery to be detected after the high-temperature, high-rate charging processing is completed;

[0052] A shelving monitoring module is used to perform a high-temperature shelving process on the target battery to be detected after the high-temperature and low-current charging process is completed, and to continuously monitor the voltage of the target battery to be detected during the high-temperature shelving process;

[0053] The defect screening module is used to screen defects of the target battery to be inspected according to the monitored voltage data.

[0054] In a fourth aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to execute a method for rapid screening of defective batteries according to the first aspect or any corresponding embodiment thereof.

[0055] In a fifth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute a method for rapidly screening defective batteries according to the first aspect or any corresponding embodiment thereof.

[0056] In a sixth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute a method for rapidly screening defective batteries according to the first aspect or any corresponding embodiment thereof.

[0057] The technical solution provided by the present invention may include the following beneficial effects:

[0058] The present invention first performs a high-temperature, high-rate charging treatment on the target battery to be detected. After the high-temperature, high-rate charging treatment is completed, the target battery to be detected is subjected to at least one high-temperature, low-current power replenishment treatment; after the high-temperature, low-current power replenishment treatment is completed, the target battery to be detected is subjected to a high-temperature shelving treatment, and the target battery to be detected is continuously voltage monitored during the high-temperature shelving process; finally, the target battery to be detected is subjected to defect screening based on the monitored voltage data. The present invention can quickly and accurately screen out defective batteries through high-temperature, high-rate charging, high-temperature, low-current power replenishment, and high-temperature shelving treatment, combined with continuous voltage monitoring, greatly shortening the battery screening time, improving the screening efficiency, and ensuring the accuracy of the screening, which helps to reduce the flow of defective batteries into the market and improve the overall quality of battery products. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0060] Figure 1 is a flow chart of a method for rapid screening of defective batteries according to an embodiment of the present invention;

[0061] Figure 2 is a flow chart of another method for quickly screening defective batteries according to an embodiment of the present invention;

[0062] Figure 3 is a schematic diagram of a curve distribution of voltage changes over time according to an embodiment of the present invention;

[0063] Figure 4 is a diagram of a rapid screening process of defective batteries corresponding to Example 1 of an embodiment of the present invention;

[0064] Figure 5 is a structural schematic diagram of a rapid screening system for defective batteries according to an embodiment of the present invention;

[0065] Figure 6 is a flowchart of a rapid screening application of a market-side battery pack according to an embodiment of the present invention;

[0066] Figure 7 is a structural block diagram of a device for quickly screening defective batteries according to an embodiment of the present invention;

[0067] Figure 8 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0069] It should be noted that lithium dendrites are an abnormally grown form of lithium metal inside the battery. When lithium dendrites overlap the aluminum foil (positive electrode aluminum foil) and the negative electrode material, an additional conductive path will be formed inside the battery, which is a key factor leading to abnormal battery self-discharge or thermal runaway. Under normal circumstances, the current conduction inside the battery is carried out according to the designed electrode and electrolyte paths, and this abnormal overlap will cause the battery to self-discharge when it is not used normally or charged, resulting in unwarranted power loss. In severe cases, it will cause thermal runaway and cause safety hazards.

[0070] Charging at a high rate in a high temperature environment will accelerate the movement of lithium ions. The transmission and insertion and extraction process of lithium ions inside the battery is affected by temperature and current. High temperature accelerates the diffusion rate of lithium ions, and high-rate charging increases the driving force for the migration of lithium ions from the positive electrode to the negative electrode. At defect locations, this accelerated movement of lithium ions is more likely to lead to the deposition of lithium and the formation of lithium dendrites, which in turn promotes the intensification of lithium precipitation. For example, during normal charging, lithium ions may be relatively evenly embedded in the negative electrode material, but under high-rate and high-temperature charging, lithium ions at defect locations are more likely to aggregate and deposit as lithium dendrites.

[0071] High temperature and low rate multiple replenishment provide favorable conditions for the growth of lithium deposition tips. Low current replenishment allows lithium ions to migrate inside the battery in a relatively slow but continuous manner. At defective sites, the tips of the already formed lithium dendrites will continue to be replenished with lithium ions under the action of this small current, thereby promoting their further growth. The sharper the lithium dendrites, the easier it is to puncture the diaphragm inside the battery. The function of the diaphragm is to separate the positive and negative electrodes and prevent short circuits. Once punctured, the positive and negative electrodes will be in direct contact, increasing the risk of short circuits, thereby accelerating abnormal reactions inside the battery and promoting the development of defects such as Al-material short circuits.

[0072] During the high-temperature storage period, lithium back-intercalation occurs in the lithium precipitation area. During the previous charging and replenishing process, the lithium formed on the surface of the negative electrode will be partially re-intercalated into the graphite negative electrode under high temperature conditions (lithium back-intercalation). This process causes the graphite to expand, because the embedding of lithium into the graphite lattice will cause changes in the lattice spacing, increasing the volume of graphite. The expanded graphite will squeeze the surrounding structure, making it easier for the existing lithium dendrites to pierce the diaphragm, causing the positive electrode aluminum foil and the negative electrode material to contact, causing a short circuit. During the storage process in the lithium precipitation area, the thickness of the positive electrode sheet remained basically unchanged, while the thickness of the negative electrode sheet increased significantly, which directly proved the process of lithium back-intercalation causing graphite expansion, and further explained the role of high-temperature storage in promoting the internal structure of the battery and the occurrence of short circuits. Ultimately, the multi-dimensional increase in lithium precipitation was achieved, accelerating the short circuit of Al-materials, and providing a theoretical basis for detecting defective batteries, making it possible to screen defective batteries by monitoring parameters such as the voltage change of the battery during this treatment process.

[0073] Based on the above content, the present invention explores the formation and growth of lithium dendrites and their impact on battery performance and safety through strategies such as increasing the amount of lithium precipitation in multiple dimensions and accelerating the short circuit of Al-materials. At the same time, the relevant mechanism hypothesis is verified through experimental observation, which provides an important theoretical basis for the design and optimization of lithium-ion batteries. By simulating the behavior of batteries under extreme conditions, defective batteries that may cause safety problems in normal use can be more effectively detected and screened out.

[0074] According to an embodiment of the present invention, an embodiment of a method for rapid screening of defective batteries is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0075] In this embodiment, a method for rapid screening of defective batteries is provided. Figure 1 is a flow chart of a method for rapid screening of defective batteries according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0076] Step S101, obtaining a target battery to be tested.

[0077] Furthermore, this step is to prepare battery samples for defect detection. In this embodiment, a certain number of batteries are selected from batteries recovered from production lines, warehouses or markets as objects to be detected. These batteries can be newly produced or have been used for a period of time. The purpose is to detect whether they have manufacturing defects or damage caused during use. The type of target battery to be detected in this embodiment can be a ternary battery.

[0078] Step S102, performing high-temperature and high-rate charging processing on the target battery to be inspected.

[0079] Furthermore, this embodiment accelerates the chemical reaction inside the battery, especially the precipitation and insertion process of lithium ions, by high temperature and high rate charging, in order to expose the potential defects of the battery more quickly. The battery is placed in a high temperature environment and charged at a current higher than the normal charging rate. This step is intended to simulate the working state of the battery under extreme conditions to accelerate the appearance of defects.

[0080] Step S103, after the high-temperature and high-rate charging process is completed, the target battery to be tested is subjected to at least one high-temperature and low-current charging process.

[0081] Furthermore, the charging step of this embodiment is to further simulate the working conditions of the battery when it is nearly fully charged, and the impact of low-current charging at high temperature on the internal structure of the battery. After completing the high-rate charging, this embodiment uses a low current to charge the target battery to be tested at least once. This step helps to detect the performance and stability of the battery when it is nearly fully charged.

[0082] Step S104, after the high-temperature and low-current charging treatment is completed, the target battery to be detected is subjected to a high-temperature shelf treatment, and during the high-temperature shelf process, the voltage of the target battery to be detected is continuously monitored.

[0083] Furthermore, the purpose of the standby step is to observe the self-discharge behavior of the battery without external current input, and the stability of the chemical reaction inside the battery at high temperature. In this embodiment, the target battery to be tested is left in a high temperature environment for a certain period of time, and the voltage change of the battery is continuously monitored to reveal whether the battery has problems such as abnormal self-discharge or too fast voltage drop.

[0084] Step S105 , performing defect screening on the target battery to be inspected according to the monitored voltage data.

[0085] Furthermore, this embodiment identifies and screens out defective batteries by analyzing voltage monitoring data. For example, by comparing the voltage drop rate or voltage curve distribution of a normal battery and a battery to be tested, if the voltage drop rate of the battery to be tested exceeds the normal range or the voltage curve continues to deviate from the normal curve after a critical time point, the battery is determined to be a defective battery. This step is the final judgment stage of defect detection, which determines whether the battery meets the quality standards.

[0086] In summary, this embodiment first performs a high-temperature, high-rate charging treatment on the target battery to be detected. After the high-temperature, high-rate charging treatment is completed, the target battery to be detected is subjected to at least one high-temperature, low-current power replenishment treatment; after the high-temperature, low-current power replenishment treatment is completed, the target battery to be detected is subjected to a high-temperature shelving treatment, and during the high-temperature shelving process, the target battery to be detected is continuously voltage monitored; finally, based on the monitored voltage data, the target battery to be detected is subjected to defect screening. The present invention can quickly and accurately screen out defective batteries through high-temperature, high-rate charging, high-temperature, low-current power replenishment, and high-temperature shelving treatment, combined with continuous voltage monitoring, greatly shortening the battery screening time, improving the screening efficiency, and ensuring the accuracy of the screening, which helps to reduce the flow of defective batteries into the market and improve the overall quality of battery products.

[0087] In this embodiment, another method for rapid screening of defective batteries is provided. Figure 2 is a flow chart of another method for rapid screening of defective batteries according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0088] Step S201, obtain the target battery to be tested. Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0089] Step S202 , based on the target voltage value, performing a charge adjustment process on the target battery to be detected, so as to adjust the state of charge of the target battery to be detected to the target voltage value.

[0090] In some optional implementations, step S202 includes:

[0091] Obtaining a current voltage value of the target battery to be tested, and comparing the current voltage value with the target voltage value;

[0092] If the current voltage value is higher than the target voltage value, a charge adjustment process is performed on the target battery to be detected, so as to adjust the state of charge of the target battery to be detected to the target voltage value.

[0093] Furthermore, the present embodiment first obtains the current voltage value of the target battery to be tested, and then compares it with the set target voltage value (for example, for a ternary battery, the target voltage can be 3.6V, and the ternary battery is a battery in which the active material of the positive electrode sheet is a ternary material, and the ternary material is a nickel-cobalt-manganese ternary material or a nickel-cobalt-aluminum ternary material). If the current voltage value is higher than the target voltage value, a charge adjustment process is required. The purpose of the charge adjustment process is to make all batteries to be tested have the same initial state of charge before entering the subsequent detection process to ensure the consistency of the detection conditions. For example, if the current voltage of a battery is 3.8V, which is higher than the target voltage value of 3.6V, it is necessary to adjust its state of charge to 3.6V through appropriate discharge and other methods, so that in subsequent high-temperature and high-rate charging, replenishing power and shelving operations, the performance of different batteries will be more comparable, and can more accurately reflect the actual situation inside the battery, avoiding deviations in the detection results due to different initial states of charge. If the current voltage value is lower than the target voltage value, no charge adjustment process is required.

[0094] Step S203, in a target high temperature environment, the target battery to be tested is subjected to a step-by-step high temperature high rate charging process with a first variable charging current. The temperature range of the target high temperature environment is 35°C to 100°C, preferably 55°C to 65°C.

[0095] In some optional implementations, step S203 includes:

[0096] Using 80% to 200% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a first-step high-temperature high-rate charging process to bring the state of charge of the target battery to be tested to 80% of the rated capacity;

[0097] Using 20% ​​to 50% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a second-step high-temperature high-rate charging process to bring the state of charge of the target battery to be tested to 90% of the rated capacity;

[0098] The target battery to be tested is charged with a third-step high-temperature, high-rate charging process using 10% to 30% of the rated capacity of the target battery to be tested as a charging current, so that the state of charge of the target battery to be tested reaches 100% of the rated capacity.

[0099] Further, the present embodiment is carried out in a high temperature environment of 35°C-100°C, such as preferably 55°C-65°C. As an example, the target high temperature environment can be 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C and 100°C.

[0100] This embodiment adopts variable charging current for step-by-step charging. The first step uses 80%-200% of the rated capacity of the battery as the charging current (i.e., 0.8SOC-1.2SOC. As an example, the charging current of the first step can be 80% of the rated capacity of the battery, 85% of the rated capacity of the battery, 90% of the rated capacity of the battery, 95% of the rated capacity of the battery, 100% of the rated capacity of the battery, 105% of the rated capacity of the battery, 110% of the rated capacity of the battery, 115% of the rated capacity of the battery, 120% of the rated capacity of the battery, 125% of the rated capacity of the battery, 126% of the rated capacity of the battery, 127% of the rated capacity of the battery, 128% of the rated capacity of the battery, 129% of the rated capacity of the battery, 130% of the rated capacity of the battery, 131% of the rated capacity of the battery, 132% of the rated capacity of the battery, 133% of the rated capacity of the battery, 134% of the rated capacity of the battery, 136% of the rated capacity of the battery, 137% of the rated capacity of the battery, 138% of the rated capacity of the battery, 139% of the rated capacity of the battery, 140% of the rated capacity of the battery, 141% of the rated capacity of the battery, 142% of the rated capacity of the battery, 143% of the rated capacity of the battery, 144% of the rated capacity of the battery, 145% of the rated capacity of the battery, 146% of the rated capacity of the battery, 147% of the rated capacity of the battery, 148% of the rated capacity of the battery, 149% of the rated capacity of the battery, 150% of the rated capacity of the battery, 1 The battery state of charge is quickly increased to 80% of the rated capacity by 130% of the rated capacity, 135% of the rated capacity of the battery, 140% of the rated capacity of the battery, 145% of the rated capacity of the battery, 150% of the rated capacity of the battery, 155% of the rated capacity of the battery, 160% of the rated capacity of the battery, 165% of the rated capacity of the battery, 170% of the rated capacity of the battery, 175% of the rated capacity of the battery, 180% of the rated capacity of the battery, 185% of the rated capacity of the battery, 190% of the rated capacity of the battery, 195% of the rated capacity of the battery and 200% of the rated capacity of the battery). This larger charging current can promote the rapid migration of lithium ions from the positive electrode to the negative electrode in a high temperature environment, accelerate the chemical reaction inside the battery, and is more likely to cause lithium precipitation in the position where defects may exist, so that the defects are initially exposed. For example, for a battery with a rated capacity of 50Ah, the first step charging may be performed with a current of 40A-60A.

[0101] The second step uses 20%-50% of the battery's rated capacity as the charging current (i.e. 0.2SOC-0.5SOC, as an example, the charging current of the second step can be 20% of the battery's rated capacity, 25% of the battery's rated capacity, 30% of the battery's rated capacity, 35% of the battery's rated capacity, 40% of the battery's rated capacity, 45% of the battery's rated capacity, and 50% of the battery's rated capacity), and continues to charge until the state of charge reaches 90%. At this time, the current is lower than the first step. The purpose is to more accurately control the embedding of lithium ions on the basis that the battery has already had a certain amount of lithium precipitation, further observe the battery's response under different charging states, and avoid excessive current causing excessive impact on the battery.

[0102] The third step uses 10%-30% of the rated capacity of the battery as the charging current (i.e. 0.1SOC-0.3SOC, as an example, the charging current of the third step can be 10% of the rated capacity of the battery, 15% of the rated capacity of the battery, 20% of the rated capacity of the battery, 25% of the rated capacity of the battery, and 30% of the rated capacity of the battery) until the battery is fully charged (the state of charge reaches 100%). The small current charging at this stage helps the battery to reach a fully charged state, while continuing to promote reactions such as lithium deposition at defective locations in a high temperature environment, providing more sufficient conditions for subsequent power replenishment and shelving detection.

[0103] Step S204, after the high-temperature and high-rate charging process is completed, in a target high-temperature environment, based on a target number of charging times, a high-temperature and low-current charging process is performed on the target battery to be tested with a first charging current; the current range of the first charging current is 5% to 15% of the rated capacity of the battery of the target battery to be tested, and the range interval of the target number of charging times is 1 to 10 times.

[0104] Furthermore, after the high-temperature high-rate charging is completed, the present embodiment immediately performs high-temperature low-current charging. Under the same target high-temperature environment, multiple (1-10 times) charging is performed with a relatively small current (5%-15% of the rated capacity of the battery, i.e., 0.05SOC-0.15SOC. As an example, the first charging current can be 5% of the rated capacity of the battery, 10% of the rated capacity of the battery, and 15% of the rated capacity of the battery). The role of low-current charging is to further promote the growth of the tip of the lithium deposition on the basis that the battery already has a certain amount of lithium deposition. Each charging will slowly replenish lithium ions to the tip of the lithium dendrite, making it gradually sharp, thereby increasing the possibility of lithium dendrites piercing the diaphragm and causing a short circuit. For example, for a battery with a rated capacity of 50Ah, the charging current may be between 2.5A-7.5A. Through multiple charging, the defects inside the battery are further developed under this mild but continuous stimulation, so that the abnormal voltage characteristics are more clearly manifested in subsequent shelving detection.

[0105] Step S205, after the high-temperature and low-current charging treatment is completed, the target battery to be detected is subjected to a high-temperature standby treatment, and during the high-temperature standby process, the voltage of the target battery to be detected is continuously monitored.

[0106] In some optional embodiments, the target battery to be tested is subjected to a high temperature storage treatment based on a target time period in a target high temperature environment; the target time period ranges from 6 hours to 12 hours.

[0107] Furthermore, after the power replenishment is completed, the present embodiment enters a high-temperature shelving stage and is shelved for 6 to 12 hours in a target high temperature environment of 35°C-100°C (preferably 55°C-65°C) (as an example, it can be shelved for 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours and 12 hours). In this process, lithium back-intercalation occurs inside the battery, and the previously formed lithium will be re-embedded in the graphite negative electrode, causing the graphite to expand. The expansion of graphite will squeeze the surrounding structure, making it easier for lithium dendrites to pierce the diaphragm, causing defects such as short circuits between the positive electrode aluminum foil and the negative electrode material. Continuous monitoring of the voltage can capture voltage fluctuations caused by changes in the internal structure of the battery in real time. During the shelving process, the voltage of a normal battery will slowly decrease according to a certain rule, while the voltage drop rate or curve distribution of a defective battery will be different from that of a normal battery due to aggravated abnormal conditions such as internal short circuits. These voltage data will become the key basis for determining whether the battery is defective.

[0108] Step S206: performing defect screening on the target battery to be inspected according to the monitored voltage data.

[0109] In some optional implementations, step S206 includes:

[0110] Calculate the target voltage drop rate of the target battery to be tested during the high-temperature storage process according to the monitored voltage data;

[0111] Obtaining a standard value of the voltage drop rate of a normal battery under the same conditions as the target battery to be tested;

[0112] If the target voltage drop rate is greater than a target multiple of the voltage drop rate standard value (such as 1.5 times or 2 times, etc., which can be determined through a large number of tests), the target battery to be tested is determined to be a defective battery.

[0113] In some optional implementations, step S206 includes:

[0114] Based on the monitored voltage data, a first curve distribution of voltage variation over time of the target battery to be tested during high temperature storage is obtained;

[0115] Obtaining a second curve distribution of voltage variation over time of a normal battery under the same conditions as the target battery to be tested;

[0116] If the first curve distribution continuously deviates from the second curve distribution after reaching the target time point (the target time point can be about 8 hours, or can be set according to actual conditions, such as 6 hours, 7 hours, 8 hours, and 9 hours, etc.), the target battery to be tested is determined to be a defective battery.

[0117] Furthermore, this embodiment provides two determination methods. The first is to calculate the voltage drop rate of the target battery to be tested during high-temperature storage, and then compare it with the standard value of the voltage drop rate of a normal battery (i.e., a battery determined to be free of defects) under the same conditions. The voltage drop of a normal battery is relatively stable when it is stored at high temperature, and there is a rough standard drop rate range. If the voltage drop rate of the target battery is significantly greater than a certain multiple of this standard value (such as 1.5 times or 2 times, etc., which can be determined through a large number of tests), it is very likely that there is a defect. For example, if the voltage of a normal battery drops by 0.01V per hour, if the target battery to be tested drops by 0.03V per hour (greater than 2 times the standard value), it can be preliminarily determined to be a defective battery.

[0118] The second is based on the voltage curve distribution, see Figure 3 The curve distribution diagram of voltage variation over time is shown, high-rate charging under high temperature conditions, continuous high-temperature environment low-current charging after full charge, and finally high-temperature shelving. The self-discharge of defective batteries gradually increases, and the detection rate reaches 100%, and the detection time can be controlled within 8 hours. In this embodiment, the first curve distribution of the voltage variation over time of the target battery to be detected during the high-temperature shelving process is obtained, and the second curve distribution of the voltage variation over time of the normal battery under the same conditions is obtained. The voltage curve of a normal battery has a certain shape and trend (such as a curve of high-temperature high-rate charging treatment showing a rapid upward trend, a curve of multiple high-temperature low-current charging treatment showing a rapid sawtooth shape up and down floating trend, and a curve of high-temperature shelving showing a stable or downward trend, a normal battery is a stable trend, and an abnormal battery is a downward trend). The voltage drops rapidly at the beginning of the shelving, and then gradually stabilizes. If the curve of the target battery begins to deviate from the curve distribution of the normal battery after a certain time point, such as the voltage drop rate continues to accelerate or the voltage value is significantly lower than that of the normal battery, the battery can be determined to be a defective battery. This method comprehensively evaluates the battery status from the perspective of dynamic changes and can more sensitively detect slowly developing defects that may exist inside the battery.

[0119] The following is an explanation of the contents disclosed in the above embodiment through simple examples:

[0120] Example 1: Taking the battery model L221N113 as an example, the rapid screening steps for defective batteries include:

[0121] 1. Preparation of metal shell ternary defective batteries: implant defects in the core making process, and the failure mode is lithium deposition coupled with Al-material short circuit;

[0122] 2. Defective batteries are formed and capacitated in the same manner as normal batteries (i.e. the samples include both defective batteries and normal batteries);

[0123] 3. Adjust the charge of the defective battery and the normal battery to 3.6V;

[0124] 4. Perform high-rate charging treatment on each battery sample in the target high-temperature environment (35℃~100℃). The charging current can be (market end charging current)*2, or it can be a step-by-step high-rate charging method.

[0125] 5. Perform multiple high-temperature and low-current charging treatments on each battery sample in a target high-temperature environment (35°C to 100°C). The charging current can be 0.1SOC (the range can be 0.05SOC to 0.15SOC), and the number of charging times can be 1-10 times.

[0126] 6. Place each battery sample in a target high temperature environment (35°C to 100°C) and continuously monitor voltage changes.

[0127] 7. During the high-temperature storage process, batteries with abnormal self-discharge / outlier voltage are considered as defective batteries.

[0128] See also Figure 4 The example 1 shown is a rapid screening process diagram of a defective battery. Before starting charging, the battery is placed on hold for 15 minutes, and then the first four constant current charging steps are performed, which is the high-temperature and high-rate charging treatment stage. The battery is charged with different high currents and cut-off voltages until it reaches 100% state of charge. In the high-temperature and high-rate charging treatment stage, the charging current decreases as the battery state of charge increases, which can simulate the charging conditions on the market side. After the high-temperature and high-rate charging treatment stage is completed, the next multiple constant current charging steps are performed, which is a multiple high-temperature and low-current charging treatment stage. The battery is charged with multiple small currents to simulate the charging during the shelving process. In the multiple high-temperature and low-current charging treatment stages, the charging and shelving step cycles can be performed for multiple turns (such as 6 turns) to further test the performance of the battery under high temperature conditions. Finally, the battery is placed at a high temperature for a long time of 8 to 12 hours to observe its self-discharge characteristics. The entire high-temperature, high-rate charging process, multiple high-temperature, low-current charging treatments, and high-temperature storage process are carried out in a target high-temperature environment of 65°C to accelerate the internal chemical reactions of the battery and expose potential defects faster.

[0129] Example 2: Taking the target battery pack as an example, the rapid screening steps for defective batteries include:

[0130] 1. Take the battery pack (before shipment / after shipment / customer complaint), and adjust the load until the voltage of a single string in the pack reaches 3.6V;

[0131] 2. The battery pack is charged at a high temperature and high rate in the target high temperature environment (35℃~100℃). The charging current can be (market end charging current)*2, or a step-by-step high rate charging method.

[0132] 3. The battery pack is subjected to multiple high-temperature and low-current charging treatments in a target high-temperature environment (35°C to 100°C). The charging current can be 0.1SOC (the range can be 0.05SOC to 0.15SOC), and the number of charging times can be 1-10 times.

[0133] 4. Place the battery pack in a target high temperature environment (35°C ~ 100°C) and continuously monitor voltage changes.

[0134] 5. During the high-temperature storage process, batteries with abnormal self-discharge / outlier voltage are considered as defective batteries.

[0135] In summary, this embodiment first performs a high-temperature, high-rate charging treatment on the target battery to be detected. After the high-temperature, high-rate charging treatment is completed, the target battery to be detected is subjected to at least one high-temperature, low-current power replenishment treatment; after the high-temperature, low-current power replenishment treatment is completed, the target battery to be detected is subjected to a high-temperature shelving treatment, and during the high-temperature shelving process, the target battery to be detected is continuously voltage monitored; finally, based on the monitored voltage data, the target battery to be detected is subjected to defect screening. The present invention can quickly and accurately screen out defective batteries through high-temperature, high-rate charging, high-temperature, low-current power replenishment, and high-temperature shelving treatment, combined with continuous voltage monitoring, greatly shortening the battery screening time, improving the screening efficiency, and ensuring the accuracy of the screening, which helps to reduce the flow of defective batteries into the market and improve the overall quality of battery products.

[0136] In this embodiment, a rapid screening system for defective batteries is provided. Figure 5 is a schematic diagram of the structure of a rapid screening system for defective batteries according to an embodiment of the present invention, the system is applied to Figure 1 as well as Figure 2 A rapid screening method for defective batteries is shown in FIG. Figure 5 As shown, the system includes: a charge and discharge tester and a temperature control device;

[0137] The temperature control device is used to provide a target high temperature environment for the target battery to be tested, and the charge and discharge tester is used to perform a charging operation of a high-temperature high-rate charging treatment and a charging operation of a high-temperature low-current charging treatment on the target battery to be tested in sequence;

[0138] Furthermore, the temperature control equipment includes a high and low temperature liquid cooling test machine and a high temperature box.

[0139] Furthermore, the system is mainly composed of a charge and discharge tester and a temperature control device, and its purpose is to realize defect screening of the target battery to be tested according to a specific method. The temperature control device is used to provide a target high temperature environment for the target battery to be tested. In the defective battery screening method, the high temperature environment is crucial to accelerate physical and chemical reactions such as lithium precipitation and lithium dendrite growth inside the battery. By creating such an environment, potential defects inside the battery can be more easily exposed. The high and low temperature liquid cooling tester can accurately control the temperature, and the liquid cooling and heating system can be used to adjust the ambient temperature of the battery. It can maintain the temperature around the battery within a set high temperature range (for example, 35°C-100°C, preferably 55°C-65°C) at different test stages. The high temperature box is another device for providing a high temperature environment, which can place the battery in a closed space and heat the space to the required high temperature to ensure that the battery is in a stable high temperature state during the test.

[0140] The charge and discharge tester is used to charge and recharge the target battery to be tested. In the target high temperature environment, the charge and discharge tester charges the battery at a specific high rate current. This high rate charging can accelerate the movement of lithium ions, making it easier to cause lithium precipitation at the location where the battery has defects, thereby initially exposing the defects of the battery. After the high rate charging is completed, the charge and discharge tester recharges the battery multiple times with a smaller current. The small current recharge helps promote the growth of the lithium precipitation tip, making it easier for lithium dendrites to pierce the diaphragm, further developing defects such as short circuits that may exist inside the battery, and providing a more obvious characteristic basis for subsequent voltage monitoring to determine whether the battery has defects.

[0141] The following is an explanation of the contents disclosed in the above embodiment through simple examples:

[0142] Take the market end battery pack as an example, please refer to Figure 6 The rapid screening application flow chart of the market-side battery pack is shown, and the rapid screening steps of defective batteries include:

[0143] 1. The vehicle was sent back to the 4S shop for battery pack inspection.

[0144] 2. After the battery pack is discharged, it is fully charged with high temperature and high current + multiple small current supplements after full charge + shelving:

[0145] (1) First, discharge the battery pack to prepare for the next test;

[0146] (2) Use a liquid heating system or incubator to heat the battery pack to simulate a high temperature environment. This process will continue until the test is completed.

[0147] (3) In a high temperature environment, use a large current to charge the battery pack until it is fully charged (i.e., the high temperature and high rate charging process stage).

[0148] (4) After the battery pack is fully charged, the battery pack is recharged again using a current of 0.1C every 10 minutes. This process is repeated six times (i.e., multiple high-temperature, low-current recharge treatment stages).

[0149] (5) After the battery is fully charged, place the battery pack in a high temperature environment for 8 hours to observe its self-discharge (i.e., the high temperature storage stage).

[0150] 3. During the storage period, monitor the self-discharge of the battery pack. If the voltage drop rate exceeds the pre-set standard (this standard is developed based on the test data), the battery pack is judged to be abnormal and may require further inspection or repair. If the voltage drop rate is within the standard range, the battery pack is judged to be normal.

[0151] In summary, this embodiment first performs a high-temperature, high-rate charging treatment on the target battery to be detected. After the high-temperature, high-rate charging treatment is completed, the target battery to be detected is subjected to at least one high-temperature, low-current power replenishment treatment; after the high-temperature, low-current power replenishment treatment is completed, the target battery to be detected is subjected to a high-temperature shelving treatment, and during the high-temperature shelving process, the target battery to be detected is continuously voltage monitored; finally, based on the monitored voltage data, the target battery to be detected is subjected to defect screening. The present invention can quickly and accurately screen out defective batteries through high-temperature, high-rate charging, high-temperature, low-current power replenishment, and high-temperature shelving treatment, combined with continuous voltage monitoring, greatly shortening the battery screening time, improving the screening efficiency, and ensuring the accuracy of the screening, which helps to reduce the flow of defective batteries into the market and improve the overall quality of battery products.

[0152] In this embodiment, a fast screening device for defective batteries is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0153] This embodiment provides a fast screening device for defective batteries, such as Figure 7 As shown, including:

[0154] A target battery to be detected acquisition module 701 is used to acquire a target battery to be detected;

[0155] A high-temperature and high-rate charging processing module 702 is used to perform high-temperature and high-rate charging processing on the target battery to be tested;

[0156] A high-temperature and low-current charging processing module 703 is used to perform at least one high-temperature and low-current charging processing on the target battery to be detected after the high-temperature and high-rate charging processing is completed;

[0157] The shelf monitoring module 704 is used to perform a high-temperature shelf treatment on the target battery to be detected after the high-temperature and low-current charging treatment is completed, and to continuously monitor the voltage of the target battery to be detected during the high-temperature shelf process;

[0158] The defect screening module 705 is used to screen defects of the target battery to be inspected according to the monitored voltage data.

[0159] In some optional embodiments, the device is also used for:

[0160] Before performing high-temperature high-rate charging processing on the target battery to be tested, a charge adjustment processing is performed on the target battery to be tested based on the target voltage value to adjust the charge state of the target battery to be tested to the target voltage value.

[0161] In some optional embodiments, the device is also used for:

[0162] Obtaining a current voltage value of the target battery to be tested, and comparing the current voltage value with the target voltage value;

[0163] If the current voltage value is higher than the target voltage value, a charge adjustment process is performed on the target battery to be detected, so as to adjust the state of charge of the target battery to be detected to the target voltage value.

[0164] In some optional implementations, the high temperature and high rate charging processing module 702 is further used to:

[0165] Under the target high temperature environment, the target battery to be inspected is subjected to a step-by-step high temperature and high rate charging process using a first variable charging current.

[0166] In some optional implementations, the high temperature and high rate charging processing module 702 is further used to:

[0167] Using 80% to 200% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a first-step high-temperature high-rate charging process to bring the state of charge of the target battery to be tested to 80% of the rated capacity;

[0168] Using 20% ​​to 50% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a second-step high-temperature high-rate charging process to bring the state of charge of the target battery to be tested to 90% of the rated capacity;

[0169] The target battery to be tested is charged with a third-step high-temperature, high-rate charging process using 10% to 30% of the rated capacity of the target battery to be tested as a charging current, so that the state of charge of the target battery to be tested reaches 100% of the rated capacity.

[0170] In some optional implementations, the high temperature and low current power compensation processing module 703 is further used for:

[0171] In a target high temperature environment, based on a target number of power replenishment times, a high temperature and low current power replenishment process is performed on the target battery to be tested with a first power replenishment current; the current range of the first power replenishment current is 5% to 15% of the rated capacity of the target battery to be tested, and the target number of power replenishment times ranges from 1 to 10 times.

[0172] In some optional implementations, the shelving monitoring module 704 is further configured to:

[0173] In a target high temperature environment, the target battery to be tested is placed in a high temperature standby process based on a target time period; the target time period ranges from 6 hours to 12 hours.

[0174] In some optional implementations, the defect screening module 705 is further used to:

[0175] Calculate the target voltage drop rate of the target battery to be tested during the high-temperature storage process according to the monitored voltage data;

[0176] Obtaining a standard value of the voltage drop rate of a normal battery under the same conditions as the target battery to be tested;

[0177] If the target voltage drop rate is greater than the target multiple of the voltage drop rate standard value, the target battery to be inspected is determined to be a defective battery.

[0178] In some optional implementations, the defect screening module 705 is further used to:

[0179] Based on the monitored voltage data, a first curve distribution of voltage variation over time of the target battery to be tested during high temperature storage is obtained;

[0180] Obtaining a second curve distribution of voltage variation over time of a normal battery under the same conditions as the target battery to be tested;

[0181] If the first curve distribution continuously deviates from the second curve distribution after the target time point, the target battery to be inspected is determined to be a defective battery.

[0182] In summary, this embodiment first performs a high-temperature, high-rate charging treatment on the target battery to be detected. After the high-temperature, high-rate charging treatment is completed, the target battery to be detected is subjected to at least one high-temperature, low-current power replenishment treatment; after the high-temperature, low-current power replenishment treatment is completed, the target battery to be detected is subjected to a high-temperature shelving treatment, and during the high-temperature shelving process, the target battery to be detected is continuously voltage monitored; finally, based on the monitored voltage data, the target battery to be detected is subjected to defect screening. The present invention can quickly and accurately screen out defective batteries through high-temperature, high-rate charging, high-temperature, low-current power replenishment, and high-temperature shelving treatment, combined with continuous voltage monitoring, greatly shortening the battery screening time, improving the screening efficiency, and ensuring the accuracy of the screening, which helps to reduce the flow of defective batteries into the market and improve the overall quality of battery products.

[0183] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0184] The embodiment of the present invention also provides a computer device, see Figure 8 , Figure 8 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 8 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 8 A processor 10 is taken as an example.

[0185] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0186] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0187] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0188] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0189] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0190] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0191] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0192] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the defined scope.

Claims

1. A method for rapid screening of defective batteries, characterized in that: The method comprises: Obtain the target battery to be tested; Performing high-temperature and high-rate charging treatment on the target battery to be tested; After the high-temperature and high-rate charging process is completed, the target battery to be tested is subjected to at least one high-temperature and low-current charging process; After the high-temperature and low-current charging treatment is completed, the target battery to be tested is subjected to a high-temperature shelf treatment, and the voltage of the target battery to be tested is continuously monitored during the high-temperature shelf process; According to the monitored voltage data, defect screening is performed on the target battery to be inspected.

2. The method according to claim 1, characterized in that Before performing high-temperature and high-rate charging on the target battery to be tested, the method further includes: Based on the target voltage value, a charge adjustment process is performed on the target battery to be detected, so as to adjust the state of charge of the target battery to be detected to the target voltage value.

3. The method according to claim 2, characterized in that The step of performing charge adjustment processing on the target battery to be detected based on the target voltage value to adjust the state of charge of the target battery to be detected to the target voltage value includes: Acquire the current voltage value of the target battery to be tested, and compare the current voltage value with the target voltage value; If the current voltage value is higher than the target voltage value, a charge adjustment process is performed on the target battery to be detected, so as to adjust the charge state of the target battery to be detected to the target voltage value.

4. The method according to claim 1, characterized in that: The step of performing high-temperature and high-rate charging on the target battery to be tested includes: In a target high temperature environment, a step-by-step high-temperature high-rate charging process is performed on the target battery to be inspected with a first variable charging current.

5. The method according to claim 4, characterized in that The stepwise high-temperature and high-rate charging process of the target battery to be tested with a first variable charging current includes: Using 80% to 200% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a first-stage high-temperature high-rate charging process to increase the state of charge of the target battery to be tested to 80% of the rated capacity; Using 20% ​​to 50% of the rated capacity of the target battery to be tested as the charging current, the target battery to be tested is subjected to a second-step high-temperature high-rate charging process to increase the state of charge of the target battery to be tested to 90% of the rated capacity; The target battery to be tested is charged at a third level of high temperature and high rate using 10% to 30% of the rated capacity of the target battery to be tested as a charging current, so as to increase the state of charge of the target battery to 100% of the rated capacity.

6. The method according to claim 1, characterized in that The step of performing at least one high-temperature and low-current charging treatment on the target battery to be detected includes: In a target high temperature environment, based on a target number of power replenishments, a first power replenishment current is used to perform high temperature and low current power replenishment processing on the target battery to be detected; a current range of the first power replenishment current is 5% to 15% of the rated capacity of the target battery to be detected, and a range interval of the target number of power replenishments is 1 to 10 times.

7. The method according to claim 1, characterized in that The step of subjecting the target battery to be tested to a high temperature standby process comprises: In a target high temperature environment, the target battery to be tested is subjected to a high temperature shelving treatment based on a target time period; the target time period ranges from 6 hours to 12 hours.

8. The method according to claim 1, characterized in that The step of screening the target battery for defects according to the monitored voltage data includes: Calculating the target voltage drop rate of the target battery to be tested during the high-temperature storage process according to the monitored voltage data; Obtaining a standard value of a voltage drop rate of a normal battery under the same conditions as the target battery to be tested; If the target voltage drop rate is greater than the target multiple of the voltage drop rate standard value, the target battery to be inspected is determined to be a defective battery.

9. The method according to claim 1, characterized in that: The step of screening the target battery for defects according to the monitored voltage data includes: Based on the monitored voltage data, a first curve distribution of voltage variation over time of the target battery to be tested during high temperature storage is obtained; Obtaining a second curve distribution of voltage variation over time of a normal battery under the same conditions as the target battery to be tested; If the first curve distribution continuously deviates from the second curve distribution after the target time point, it is determined that the target battery to be inspected is a defective battery.

10. The method according to any one of claims 4 to 7, characterized in that: The target high temperature environment has a temperature range of 35°C to 100°C.

11. The method according to claim 10, characterized in that The target high temperature environment has a temperature range of 55°C to 65°C.

12. A rapid screening system for defective batteries, characterized in that: The system is applied to the method described in any one of claims 1 to 11, and the system comprises: a charge and discharge tester and a temperature control device; The temperature control device is used to provide a target high temperature environment for the target battery to be tested, and the charge and discharge tester is used to perform a charging operation of a high-temperature high-rate charging treatment and a charging operation of a high-temperature small-current charging treatment on the target battery to be tested in sequence.

13. A rapid screening device for defective batteries, characterized in that: A target battery to be detected acquisition module is used to acquire the target battery to be detected; A high-temperature and high-rate charging processing module is used to perform high-temperature and high-rate charging processing on the target battery to be tested; A high-temperature, low-current charging processing module is used to perform at least one high-temperature, low-current charging processing on the target battery to be detected after the high-temperature, high-rate charging processing is completed; A shelving monitoring module is used to perform a high-temperature shelving process on the target battery to be detected after the high-temperature and low-current charging process is completed, and to continuously monitor the voltage of the target battery to be detected during the high-temperature shelving process; The defect screening module is used to screen defects of the target battery to be inspected according to the monitored voltage data.

14. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for rapid screening of defective batteries according to any one of claims 1 to 11 by executing the computer instructions.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute a method for rapidly screening defective batteries according to any one of claims 1 to 9.

16. A computer program product, characterized in that The method comprises computer instructions for causing a computer to execute a method for rapidly screening defective batteries according to any one of claims 1 to 11.

Images