Battery screening methods, apparatus, electronic devices and storage media

Abstract

This invention provides a battery screening method, apparatus, electronic device, and non-transitory computer-readable storage medium. The battery screening method includes: obtaining a first internal resistance value for each battery in a battery pack; performing a first sorting process on the battery pack based on the first internal resistance value; performing a pre-charge process on each battery in the battery pack, obtaining a pre-charge duration and a voltage value, a second internal resistance value, and a capacity value of the battery after the pre-charge process; and performing a second sorting process on the battery pack based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge duration. This battery screening method, by performing a first and second sorting process on multiple batteries in a battery pack, classifies multiple batteries, allowing batteries that meet usage requirements to be grouped and used, and eliminating batteries that do not meet usage requirements. This improves both the consistency of batteries within the battery pack and the utilization rate of the batteries.

Description

Technical Field

[0001] This invention relates to the field of battery sorting technology, and in particular to a battery sorting method, apparatus, electronic device, and non-transitory computer-readable storage medium. Background Technology

[0002] As electric vehicles demand increasingly longer driving ranges, high-energy-density lithium-ion batteries are being widely adopted. Electric vehicles typically have multiple battery packs, and within each pack, battery modules are usually connected in different series and parallel configurations to meet varying voltage and power output requirements.

[0003] Due to the influence of various factors such as raw materials, equipment, and environment during the manufacturing process of lithium-ion batteries, performance differences are inevitable. There may be differences in parameters such as capacity, voltage, and internal resistance between multiple power battery packs and multiple battery modules within a single power battery pack. When these differences are too large, the uneven distribution of operating voltage and current among the power battery packs or battery modules can lead to safety issues.

[0004] Before assembly, batteries need to be sorted to ensure the consistency of battery parameters among multiple batteries in the battery pack. Current technologies often screen batteries based on parameters such as internal resistance and capacity. However, this screening method is not very precise, resulting in a large proportion of defective batteries, while good batteries are not accurately classified. Summary of the Invention

[0005] This invention provides a battery screening method, apparatus, electronic device, and non-transitory computer-readable storage medium to solve the problem of poor screening accuracy in existing battery screening methods.

[0006] In a first aspect, the present invention provides a battery screening method, comprising:

[0007] Obtain the first internal resistance value of each cell in the battery pack;

[0008] Based on the first internal resistance value, the battery pack is sorted for the first time.

[0009] Each battery in the battery pack is pre-charged to obtain the pre-charge duration and the voltage, second internal resistance, and capacity of the battery after the pre-charge process.

[0010] The battery pack is sorted a second time based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge duration.

[0011] According to a battery screening method provided by the present invention, the first sorting process of the battery pack based on the first internal resistance value includes:

[0012] If the first internal resistance value of a battery in a battery pack is less than or equal to a preset internal resistance value, the battery is determined to be a first-type battery.

[0013] If the first internal resistance value of a battery in the battery pack is greater than a preset internal resistance value, the battery is determined to be a second type of battery.

[0014] According to a battery screening method provided by the present invention, the second sorting process of the battery pack based on the voltage value includes:

[0015] The voltage threshold range is determined based on the cutoff voltage of the pre-charge process;

[0016] If the voltage value of the battery in the first type of battery is within the voltage threshold range, the battery is determined to be a first good battery;

[0017] If the voltage value of a battery in the first type is not within the voltage threshold range, the battery is determined to be a second good battery.

[0018] According to a battery screening method provided by the present invention, the second sorting process of the battery pack based on the second internal resistance value includes:

[0019] If the second internal resistance value of the battery in the second type of battery is less than or equal to the preset internal resistance value, the battery is determined to be either a first good battery or a second good battery.

[0020] According to a battery screening method provided by the present invention, the second sorting process of the battery pack based on the second internal resistance value further includes:

[0021] Based on the absolute difference between the second internal resistance value and the first internal resistance value of the first good battery, the first internal resistance difference threshold range and the second internal resistance difference threshold range are determined.

[0022] If the absolute difference in internal resistance of the batteries in the second type of battery is within the range of the first internal resistance difference threshold, the battery is determined to be a first good battery.

[0023] If the absolute difference in internal resistance of the batteries in the second type of battery is within the range of the second internal resistance difference threshold, the battery is determined to be a second good battery.

[0024] According to a battery screening method provided by the present invention, the second sorting process of the battery pack based on the capacity value and the precharge duration includes:

[0025] Determine the capacity threshold range and the precharge duration threshold range;

[0026] Multiple first-good batteries are classified into a first-good battery pack. If the capacity value of the batteries in the first-good battery pack is not within the capacity threshold range and the pre-charge time of the batteries is not within the pre-charge time threshold range, the batteries are determined to be second-good batteries.

[0027] According to a battery screening method provided by the present invention, the second sorting process of the battery pack based on the capacity value and the pre-charge duration further includes:

[0028] Multiple second-good batteries are classified into a second-good battery pack. In the second-good battery pack, the capacity value of the batteries is not within the capacity threshold range, and the pre-charge time of the batteries is not within the pre-charge time threshold range. The batteries are then determined to be second-class batteries.

[0029] If the capacity value of the battery in the second type is not within the capacity threshold range and the pre-charge time is not within the pre-charge time threshold range, the battery is determined to be an abnormal battery.

[0030] In a second aspect, the present invention also provides a battery screening device, comprising:

[0031] The first acquisition module is used to acquire the first internal resistance value of each battery in the battery pack;

[0032] The first sorting module performs the first sorting process on the battery pack based on the first internal resistance value;

[0033] The second acquisition module is used to precharge each battery in the battery pack and acquire the precharge duration and the voltage value, second internal resistance value and capacity value of the battery after the precharge process.

[0034] The second sorting module performs a second sorting process on the battery pack based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge duration.

[0035] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the battery screening method when running the program.

[0036] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the battery screening method.

[0037] The battery screening method provided by this invention classifies multiple batteries in a battery pack by performing a first sorting process and a second sorting process. Batteries that meet the usage requirements are classified and combined for use, while batteries that do not meet the usage requirements are eliminated. This method is beneficial to improving the consistency of batteries in the battery pack and also to improving the utilization rate of batteries. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a flowchart illustrating the battery screening method provided by the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] The following is combined Figure 1 This invention describes a battery screening method according to an embodiment of the present invention.

[0044] like Figure 1 As shown, the battery screening method provided in this embodiment of the invention includes:

[0045] Step 110: Obtain the first internal resistance value of each cell in the battery pack;

[0046] Step 120: Based on the first internal resistance value, perform the first sorting process on the battery pack;

[0047] Step 130: Perform pre-charge processing on each battery in the battery pack, and obtain the pre-charge duration and the voltage, second internal resistance and capacity values ​​of the battery after pre-charge processing;

[0048] Step 140: Based on the voltage value, second internal resistance value, capacity value and pre-charge time, perform a second sorting process on the battery pack.

[0049] Specifically, multiple batteries from the same batch are grouped into a battery pack. The number of batteries in the pack is set according to requirements. The batteries in the pack are then screened, with the batteries to be screened being those that have undergone electrolyte filling. The internal resistance value of each battery after electrolyte filling is collected, and this internal resistance value is defined as the first internal resistance value.

[0050] The battery pack is initially screened based on the first internal resistance value of each cell. This screening can be based on the consistency of the first internal resistance values, categorizing each cell into either Category 1 or Category 2. Category 1 cells are normal cells that meet usage requirements. Category 2 cells require further screening, as they contain abnormal cells that do not meet usage requirements.

[0051] After the initial sorting of the battery packs, each battery in the first category is pre-charged, and the same applies to each battery in the second category. For example, a constant current charging of 0.02 cd / m² can be used for 1 hour, charging to the set cutoff voltage. After pre-charging each battery, its voltage, internal resistance, capacity, and the pre-charging time at which the cutoff voltage is reached are collected. The internal resistance value collected after pre-charging is defined as the second internal resistance value.

[0052] The first and second types of batteries undergo a second sorting process based on voltage, second internal resistance, capacity, and pre-charge time. For example, multiple batteries in the first type can be further classified into first-good batteries and second-good batteries based on their voltage.

[0053] For example, batteries in the second category can be screened based on the consistency of their second internal resistance values. Batteries in the second category with a second internal resistance value less than or equal to a preset internal resistance value are classified into the first category. Batteries in the second category with a second internal resistance value less than or equal to the preset internal resistance value are defined as batteries to be screened as good products. Furthermore, these good products can be classified into first-good batteries or second-good batteries based on their voltage values. Multiple first-good batteries are classified into a first-good battery pack, and multiple second-good batteries are classified into a second-good battery pack.

[0054] For example, the first good battery pack, the second good battery pack, and the second type of battery can be further screened based on the absolute difference between the second and first internal resistance values, the capacity value, and the pre-charge time. Batteries that do not meet the criteria in the first good battery pack are classified into the second good battery pack, and batteries that do not meet the criteria in the second good battery pack are classified into the second type of battery. Batteries that meet the criteria in the second type of battery are classified into either the first good battery pack or the second good battery pack. The batteries remaining in the second type of battery after screening are the abnormal batteries.

[0055] By performing a first and second sorting process on multiple batteries within the battery pack, the batteries are classified, and those that meet the usage requirements are grouped and used together, while those that do not meet the usage requirements are eliminated. This not only improves the consistency of the batteries within the battery pack but also enhances the utilization rate of the batteries.

[0056] In this embodiment of the invention, by performing a first sorting process and a second sorting process on multiple batteries in the battery pack, the multiple batteries are classified, and the batteries that meet the usage requirements are classified and combined for use, while the batteries that do not meet the usage requirements are eliminated. This is beneficial to improving the consistency of the batteries in the battery pack and also to improving the utilization rate of the batteries.

[0057] In an optional embodiment, the battery pack undergoes a first sorting process based on a first internal resistance value, including:

[0058] If the first internal resistance value of a battery in the battery pack is less than or equal to a preset internal resistance value, the battery is determined to be a Class I battery.

[0059] If the first internal resistance value of a battery in the battery pack is greater than the preset internal resistance value, the battery is determined to be a type II battery.

[0060] Specifically, the preset internal resistance value is determined based on the model of the battery to be screened, the first internal resistance value of each battery in the battery pack is collected, and the multiple batteries in the battery pack are classified into the first type of battery or the second type of battery based on the comparison result between the first internal resistance value and the preset internal resistance value.

[0061] If the battery's first internal resistance is less than or equal to the preset internal resistance, this battery meets the usage requirements and is classified as a Class I battery. If the battery's first internal resistance is greater than the preset internal resistance, this battery is classified as a Class II battery.

[0062] Furthermore, a second sorting can be performed on multiple batteries in the first category. Based on the battery parameters of the pre-charged batteries, each battery in the first category can be classified as a first-good battery or a second-good battery. The first-good batteries and the second-good batteries can be used in combination. Multiple first-good batteries can be assembled into a battery pack, and multiple second-good batteries can be assembled into a battery pack.

[0063] Furthermore, a second sorting can be performed on multiple batteries in the second category. Based on the battery parameters of the pre-charged batteries, the batteries in the second category that meet the conditions are classified as first-quality batteries or second-quality batteries, while the batteries in the second category that do not meet the conditions are classified as abnormal batteries.

[0064] In this embodiment of the invention, the batteries are classified into first-class batteries and second-class batteries based on the comparison result of the first internal resistance value and the preset internal resistance value, which helps to improve the classification efficiency of good batteries and abnormal batteries.

[0065] In an optional embodiment, a second sorting process is performed on the battery pack based on the voltage value, including:

[0066] The voltage threshold range is determined based on the cutoff voltage of the pre-charge process;

[0067] In the first category of batteries, the voltage value of the battery is within the voltage threshold range, and the battery is judged to be a first-class good battery.

[0068] In the first category of batteries, the voltage value of the battery is not within the voltage threshold range, and the battery is judged to be a second-grade good battery.

[0069] Specifically, based on the comparison between the first internal resistance value and the preset internal resistance value, multiple batteries are classified into a first type of battery and a second type of battery. Then, multiple batteries in the first type of battery and multiple batteries in the second type of battery are pre-charged. After the pre-charge process, the voltage value of each battery is collected.

[0070] The battery undergoes a pre-charge process, and the voltage threshold range is determined by the cutoff voltage of this pre-charge process. For example, values ​​within a certain range above and below the cutoff voltage are defined as the voltage threshold range. For instance, if the cutoff voltage for pre-charge is 3.365V, the voltage threshold range is determined to be 3.320–3.400V.

[0071] Based on the comparison between the voltage value and the voltage threshold range, multiple batteries in the first category are classified. Batteries whose voltage values ​​are within the voltage threshold range are classified as first-grade good batteries; batteries whose voltage values ​​are outside the voltage threshold range are classified as second-grade good batteries.

[0072] The voltage threshold range is determined by the cutoff voltage of the pre-charge treatment. Based on the comparison between the voltage value of the battery in the first category and the voltage threshold range, the battery is classified as a first-grade good battery or a second-grade good battery. The battery classification is further refined. Multiple first-grade good batteries or multiple second-grade good batteries can be used in combination, which helps to further improve the consistency of the batteries in the battery pack and the safety of the battery pack.

[0073] In an optional embodiment, a second sorting process is performed on the battery pack based on the second internal resistance value, including:

[0074] If the second internal resistance value of the battery in the second type is less than or equal to the preset internal resistance value, the battery is determined to be either a first-quality battery or a second-quality battery.

[0075] Specifically, multiple batteries in the second category are pre-charged. After pre-charging, the second internal resistance value of each battery in the second category is collected. If the second internal resistance value of a battery is less than or equal to a preset internal resistance value, this battery is classified into the first category. These batteries in the second category are defined as unselected good batteries, and classifying them into the first category helps improve battery utilization.

[0076] Furthermore, based on the comparison results between the voltage value of the battery to be screened and the voltage threshold range, the batteries to be screened are classified. If the voltage value of the battery to be screened is within the voltage threshold range, it is classified as a first-class good battery; if the voltage value of the battery to be screened is not within the voltage threshold range, it is classified as a second-class good battery.

[0077] In an optional embodiment, the second sorting process of the battery pack based on the second internal resistance value further includes:

[0078] Based on the absolute difference between the second internal resistance value and the first internal resistance value of the first good battery, the threshold range of the first internal resistance difference and the threshold range of the second internal resistance difference are determined.

[0079] In the second category of batteries, if the absolute difference in internal resistance is within the first internal resistance difference threshold range, the battery is determined to be a first-class good battery.

[0080] In the second category of batteries, if the absolute difference in internal resistance is within the second internal resistance difference threshold range, the battery is determined to be a second-grade good battery.

[0081] Specifically, before pre-charging, the first internal resistance value of each battery in the battery pack is collected; after pre-charging, the second internal resistance value of each battery in the battery pack is collected. The first and second internal resistance values ​​of the first good battery are known. The absolute difference between the first and second internal resistance values ​​is defined as the absolute internal resistance difference. Linear fitting can be performed on multiple absolute internal resistance differences of multiple first good batteries to obtain the first internal resistance difference threshold range. The first internal resistance difference threshold range includes the first internal resistance difference threshold and the second internal resistance difference threshold, where the first internal resistance difference threshold is zero and the second internal resistance difference threshold is a number greater than zero.

[0082] Based on the comparison results of the absolute difference in internal resistance of the batteries in the second category with the first internal resistance difference threshold range, the second category of batteries is further screened. If the absolute difference in internal resistance of the batteries in the second category is within the first internal resistance difference threshold range, then the battery is classified as a first-class good battery.

[0083] Further, a second internal resistance difference threshold range is determined. Since this range is close to the first internal resistance difference threshold range, a third internal resistance difference threshold is determined. This third threshold is greater than the second threshold. Values ​​greater than the second threshold and less than or equal to the third threshold are defined as the second internal resistance difference threshold range. Based on the comparison of the absolute internal resistance difference of the batteries in the second category with the second and third thresholds, the remaining batteries in the second category are further screened. If the absolute internal resistance difference of a battery in the second category is greater than the second threshold and less than or equal to the third threshold, that battery is classified as a second-class good battery. It is understandable that if the absolute internal resistance difference of a battery in the second category is greater than the third threshold, that battery is still classified as a second-class battery.

[0084] In an optional embodiment, the battery pack undergoes a second sorting process based on its capacity and precharge duration, including:

[0085] Determine the capacity threshold range and the precharge duration threshold range;

[0086] Multiple first-good batteries are classified into a first-good battery pack. If the capacity value of the batteries in the first-good battery pack is not within the capacity threshold range and the pre-charge time of the batteries is not within the pre-charge time threshold range, the batteries are determined to be second-good batteries.

[0087] Specifically, based on the above screening, the selected first-good batteries are grouped into first-good battery packs. After pre-charging, the capacity value and pre-charging time of each battery are collected, and the capacity value and pre-charging time of each battery in the first-good battery pack are known.

[0088] The capacity threshold range and precharge duration threshold range are determined based on the precharge parameters of the precharge process. The capacity threshold range includes a first capacity threshold and a second capacity threshold, where the first capacity threshold is less than the second capacity threshold. The precharge duration threshold range includes a first precharge duration threshold and a second precharge duration threshold, where the first precharge duration threshold is less than the second precharge duration threshold.

[0089] A first vertical line is drawn based on the capacity value, and a second vertical line is drawn based on the precharge duration. The first and second vertical lines are parallel. The first vertical line is marked with a first capacity threshold and a second capacity threshold, and the second vertical line is marked with a first precharge duration threshold and a second precharge duration threshold. A first horizontal line is drawn based on the first capacity threshold and the first precharge duration threshold, and a second horizontal line is drawn based on the second capacity threshold and the second precharge duration threshold. The first horizontal line, the second horizontal line, the first vertical line, and the second vertical line form a square frame.

[0090] Further classification was performed on the multiple batteries within the first good-quality battery pack. Batteries in the first good-quality battery pack whose capacity values ​​and pre-charge times were both outside the capacity threshold range were reclassified into the second good-quality battery pack. A capacity value outside the capacity threshold range means either a capacity value greater than the second capacity threshold or a capacity value less than the first capacity threshold; a pre-charge time outside the pre-charge time threshold range means either a pre-charge time greater than the second pre-charge time threshold or a pre-charge time less than the first pre-charge time threshold.

[0091] The rectangular diagram makes it easier to classify multiple batteries within the first good battery pack, mark multiple first good batteries, and classify batteries outside the rectangular diagram into the second good battery pack.

[0092] In an optional embodiment, the battery pack undergoes a second sorting process based on its capacity and pre-charge duration, which further includes:

[0093] Multiple second-good batteries are classified into a second-good battery pack. If the capacity value of the batteries in the second-good battery pack is not within the capacity threshold range and the pre-charge time of the batteries is not within the pre-charge time threshold range, the batteries are determined to be second-class batteries.

[0094] In the second category of batteries, if the battery's capacity value is not within the capacity threshold range and the battery's pre-charge time is not within the pre-charge time threshold range, the battery is determined to be an abnormal battery.

[0095] Specifically, based on the above screening, the selected second-good batteries are grouped into second-good battery packs, and the batteries within each second-good battery pack are further classified. Batteries in the second-good battery pack whose capacity values ​​are outside the capacity threshold range and whose pre-charge durations are outside the pre-charge duration threshold range are classified into the second category of batteries. A capacity value outside the capacity threshold range means the capacity value is greater than the second capacity threshold or less than the first capacity threshold; a pre-charge duration outside the pre-charge duration threshold range means the pre-charge duration is greater than the second pre-charge duration threshold or less than the first pre-charge duration threshold.

[0096] The rectangular diagram makes it easier to classify multiple batteries within the second-grade battery pack, mark multiple second-grade batteries, and classify batteries outside the rectangular diagram into the second-grade battery category.

[0097] Based on the above screening, multiple batteries in the second category are further classified. Batteries in the second category whose capacity value is outside the capacity threshold range and whose pre-charge time is outside the pre-charge time threshold range are classified as abnormal batteries. A capacity value outside the capacity threshold range means the capacity value is greater than the second capacity threshold or less than the first capacity threshold; a pre-charge time outside the pre-charge time threshold range means the pre-charge time is greater than the second pre-charge time threshold or less than the first pre-charge time threshold.

[0098] The rectangular diagram makes it easier to classify and mark multiple batteries in the second category, and classify batteries outside the rectangular diagram as abnormal batteries.

[0099] The battery screening method described above achieves accurate classification of first-grade good batteries, second-grade good batteries, and abnormal batteries, while maintaining high screening efficiency.

[0100] The battery screening device provided by the present invention is described below. The battery screening device described below can be referred to in correspondence with the battery screening method described above.

[0101] The battery sorting device includes a first acquisition module, a first sorting module, a second acquisition module, and a second sorting module. The first acquisition module is used to acquire the first internal resistance value of each battery in the battery pack; the first sorting module performs a first sorting process on the battery pack based on the first internal resistance value; the second acquisition module is used to pre-charge each battery in the battery pack, acquire the pre-charge time, and the voltage value, second internal resistance value, and capacity value of the battery after the pre-charge process; the second sorting module performs a second sorting process on the battery pack based on the voltage value, second internal resistance value, capacity value, and pre-charge time.

[0102] Specifically, multiple batteries from the same batch are grouped into one battery pack, and the first internal resistance value of each battery after electrolyte injection is collected. The first acquisition module acquires the first internal resistance value of each battery.

[0103] Based on the comparison between the first internal resistance value and the preset internal resistance value, the first sorting module performs the first sorting process on the multiple batteries in the battery pack. If the first internal resistance value of a battery is less than or equal to the preset internal resistance value, the battery is classified into the first category of batteries; if the first internal resistance value of a battery is greater than the preset internal resistance value, the battery is classified into the second category of batteries.

[0104] Based on the comparison between the first internal resistance value and the preset internal resistance value, the multiple batteries in the battery pack are classified into a first category and a second category. Then, multiple batteries in the first category and multiple batteries in the second category are pre-charged. After pre-charging, the voltage value, second internal resistance value, capacity value, and pre-charging time of each battery are collected. The second acquisition module acquires the battery's voltage value, second internal resistance value, capacity value, and pre-charging time.

[0105] The second sorting module performs a second sorting process on the battery pack based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge time.

[0106] Specifically, based on the comparison between the voltage value and the voltage threshold range, multiple batteries in the first category are classified. If the battery's voltage value is within the voltage threshold range, it is classified as a first-class good battery; if the battery's voltage value is outside the voltage threshold range, it is classified as a second-class good battery.

[0107] Furthermore, multiple batteries in the second category are further screened. Batteries in the second category whose second internal resistance value is less than or equal to a preset internal resistance value are classified into the first category. These batteries in the second category are defined as unseen good batteries and classified into the first category, which helps improve battery utilization.

[0108] Furthermore, based on the comparison results between the voltage value of the battery to be screened and the voltage threshold range, the batteries to be screened are classified. If the voltage value of the battery to be screened is within the voltage threshold range, it is classified as a first-class good battery; if the voltage value of the battery to be screened is not within the voltage threshold range, it is classified as a second-class good battery.

[0109] Further, a first internal resistance difference threshold range is determined. This range includes a first internal resistance difference threshold and a second internal resistance difference threshold. The first internal resistance difference threshold is zero, and the second internal resistance difference threshold is a number greater than zero. Based on the comparison between the absolute difference in internal resistance and the first internal resistance difference threshold range, the second type of batteries are further screened. If the absolute difference in internal resistance of the batteries in the second type of batteries falls within the first internal resistance difference threshold range, then the battery is classified as a first-class good battery.

[0110] Further, a second internal resistance difference threshold range is determined, and a third internal resistance difference threshold is determined. The third internal resistance difference threshold is greater than the second internal resistance difference threshold. Values ​​greater than the second internal resistance difference threshold and less than or equal to the third internal resistance difference threshold are defined as the second internal resistance difference threshold range. Based on the comparison results of the absolute internal resistance difference value with the second and third internal resistance difference thresholds, the remaining batteries in the second category are further screened. If the absolute internal resistance difference value of a battery in the second category is greater than the second internal resistance difference threshold and less than or equal to the third internal resistance difference threshold, then the battery is classified as a second-class good battery. It is understandable that if the absolute internal resistance difference value of a battery in the second category is greater than the third internal resistance difference threshold, then the battery is still classified as a second-class battery.

[0111] Based on the above screening, the selected first-good batteries are grouped into first-good battery packs. The capacity threshold range and pre-charge duration threshold range are determined according to the pre-charge parameters of the pre-charge process. The capacity threshold range includes a first capacity threshold and a second capacity threshold, with the first capacity threshold being less than the second capacity threshold. The pre-charge duration threshold range includes a first pre-charge duration threshold and a second pre-charge duration threshold, with the first pre-charge duration threshold being less than the second pre-charge duration threshold.

[0112] The batteries within the first good-quality battery pack are further categorized. Batteries in the first good-quality battery pack whose capacity values ​​are outside the capacity threshold range and whose pre-charge durations are outside the pre-charge duration threshold range are reclassified into the second good-quality battery pack. A capacity value outside the capacity threshold range means the capacity value is greater than the second capacity threshold or less than the first capacity threshold; a pre-charge duration outside the pre-charge duration threshold range means the pre-charge duration is greater than the second pre-charge duration threshold or less than the first pre-charge duration threshold.

[0113] Based on the above screening, the selected second-good batteries are grouped into second-good battery packs, and the batteries within these packs are further classified. Batteries in second-good battery packs whose capacity values ​​are outside the capacity threshold range and whose pre-charge durations are outside the pre-charge duration threshold range are classified into second-category batteries. A capacity value outside the capacity threshold range means the capacity value is greater than the second capacity threshold or less than the first capacity threshold; a pre-charge duration outside the pre-charge duration threshold range means the pre-charge duration is greater than the second pre-charge duration threshold or less than the first pre-charge duration threshold.

[0114] Based on the above screening, multiple batteries in the second category are further classified. Batteries in the second category whose capacity value is outside the capacity threshold range and whose pre-charge time is outside the pre-charge time threshold range are classified as abnormal batteries. A capacity value outside the capacity threshold range means the capacity value is greater than the second capacity threshold or less than the first capacity threshold; a pre-charge time outside the pre-charge time threshold range means the pre-charge time is greater than the second pre-charge time threshold or less than the first pre-charge time threshold.

[0115] The battery sorting device enables precise classification of first-grade good batteries, second-grade good batteries, and defective batteries, while maintaining high sorting efficiency.

[0116] like Figure 2As shown, this embodiment of the invention also provides an electronic device, which may include: a processor 210, a communication interface 220, a memory 230, and a communication bus 240, wherein the processor 210, the communication interface 220, and the memory 230 communicate with each other through the communication bus 240. The processor 210 can call logical instructions in the memory 230 to execute a battery screening method.

[0117] It should be noted that the electronic device in this embodiment can be a server, a PC, or other devices, as long as its structure includes the following: Figure 2 The processor 210, communication interface 220, memory 230, and communication bus 240 shown are interconnected via the communication bus 240. The processor 210 can call logical instructions stored in the memory 230 to execute the aforementioned method. This embodiment does not limit the specific implementation of the electronic device.

[0118] Furthermore, the logical instructions in the aforementioned memory 230 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0119] The present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein when the program instructions are executed by a computer, the computer is able to execute the battery screening method provided by the above methods, the battery screening method comprising: obtaining a first internal resistance value of each battery in the battery pack; performing a first sorting process on the battery pack based on the first internal resistance value; performing a pre-charge process on each battery in the battery pack, obtaining a pre-charge duration and a voltage value, a second internal resistance value, and a capacity value of the battery after the pre-charge process; and performing a second sorting process on the battery pack based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge duration.

[0120] The present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the battery screening methods described above. The battery screening methods include: obtaining a first internal resistance value for each battery in a battery pack; performing a first sorting process on the battery pack based on the first internal resistance value; performing a pre-charge process on each battery in the battery pack, obtaining a pre-charge duration and a voltage value, a second internal resistance value, and a capacity value of the battery after the pre-charge process; and performing a second sorting process on the battery pack based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge duration.

[0121] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0122] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0123] The foregoing disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described above. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery screening method, characterized in that, include: Obtain the first internal resistance value of each cell in the battery pack; Based on the first internal resistance value, the battery pack is sorted for the first time. The first sorting process for the battery pack based on the first internal resistance value includes: If the first internal resistance value of a battery in the battery pack is less than or equal to a preset internal resistance value, the battery is determined to be a first-class battery; if the first internal resistance value of a battery in the battery pack is greater than the preset internal resistance value, the battery is determined to be a second-class battery. Each battery in the battery pack is pre-charged to obtain the pre-charge duration and the voltage, second internal resistance, and capacity of the battery after the pre-charge process. Based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge duration, the battery pack undergoes a second sorting process. The second sorting process for the battery pack based on the voltage value includes: Based on the cutoff voltage of the pre-charge process, a voltage threshold range is determined; if the voltage value of a battery in the first type of battery is within the voltage threshold range, the battery is determined to be a first good battery; if the voltage value of a battery in the first type of battery is not within the voltage threshold range, the battery is determined to be a second good battery. The second sorting process of the battery pack based on the second internal resistance value includes: If the second internal resistance value of the battery in the second type of battery is less than or equal to the preset internal resistance value, the battery is determined to be a first good battery or a second good battery. The second sorting process for the battery pack based on the capacity value and the pre-charge duration includes: Determine the capacity threshold range and the precharge duration threshold range; classify multiple first-good batteries into a first-good battery pack. If the capacity value of a battery in the first-good battery pack is not within the capacity threshold range and the precharge duration of the battery is not within the precharge duration threshold range, the battery is determined to be a second-good battery.

2. The battery screening method according to claim 1, characterized in that, The second sorting process for the battery pack based on the second internal resistance value also includes: Based on the absolute difference between the second internal resistance value and the first internal resistance value of the first good battery, the first internal resistance difference threshold range and the second internal resistance difference threshold range are determined. If the absolute difference in internal resistance of the batteries in the second type of battery is within the range of the first internal resistance difference threshold, the battery is determined to be a first good battery. If the absolute difference in internal resistance of the batteries in the second type of battery is within the range of the second internal resistance difference threshold, the battery is determined to be a second good battery.

3. The battery screening method according to claim 2, characterized in that, The second sorting process for the battery pack based on the capacity value and the pre-charge duration further includes: Multiple second-good batteries are classified into a second-good battery pack. In the second-good battery pack, the capacity value of the batteries is not within the capacity threshold range, and the pre-charge time of the batteries is not within the pre-charge time threshold range. The batteries are then determined to be second-class batteries. If the capacity value of the battery in the second type is not within the capacity threshold range and the pre-charge time is not within the pre-charge time threshold range, the battery is determined to be an abnormal battery.

4. A battery sorting device, characterized in that, include: The first acquisition module is used to acquire the first internal resistance value of each battery in the battery pack; The first sorting module performs the first sorting process on the battery pack based on the first internal resistance value; The first sorting process for the battery pack based on the first internal resistance value includes: If the first internal resistance value of a battery in the battery pack is less than or equal to a preset internal resistance value, the battery is determined to be a first-class battery; if the first internal resistance value of a battery in the battery pack is greater than the preset internal resistance value, the battery is determined to be a second-class battery. The second acquisition module is used to precharge each battery in the battery pack and acquire the precharge duration and the voltage value, second internal resistance value and capacity value of the battery after the precharge process. The second sorting module performs a second sorting process on the battery pack based on the voltage value, the second internal resistance value, the capacity value, and the pre-charge duration. The second sorting process for the battery pack based on the voltage value includes: Based on the cutoff voltage of the pre-charge process, a voltage threshold range is determined; if the voltage value of a battery in the first type of battery is within the voltage threshold range, the battery is determined to be a first good battery; if the voltage value of a battery in the first type of battery is not within the voltage threshold range, the battery is determined to be a second good battery. The second sorting process of the battery pack based on the second internal resistance value includes: If the second internal resistance value of the battery in the second type of battery is less than or equal to the preset internal resistance value, the battery is determined to be a first good battery or a second good battery. The second sorting process for the battery pack based on the capacity value and the pre-charge duration includes: Determine the capacity threshold range and the precharge duration threshold range; classify multiple first-good batteries into a first-good battery pack. If the capacity value of a battery in the first-good battery pack is not within the capacity threshold range and the precharge duration of the battery is not within the precharge duration threshold range, the battery is determined to be a second-good battery.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor runs the program, it implements the battery screening method as described in any one of claims 1 to 3.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program is executed by the processor to implement the battery screening method as described in any one of claims 1 to 3.

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