Battery case short circuit processing method and system

Abstract

The application provides a battery shell short circuit processing method and system. The battery shell short circuit processing method comprises the following steps: when it is detected that the shell of the battery is short-circuited with the first pole of the battery, the shell is short-circuited with the second pole of the battery; if the first pole is the positive pole, the second pole is the negative pole; if the first pole is the negative pole, the second pole is the positive pole; the short circuit between the battery shell and the second pole is disconnected, and the battery is placed for a preset time length; after the battery is placed for the time length, the potential difference between the shell and the first pole is detected; and according to the potential difference between the shell and the first pole being within a preset range, the type of the short circuit between the shell and the first pole is determined and whether the short circuit is eliminated.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method and system for handling short circuits in the casing of a battery. Background Technology

[0002] In recent years, the application scope of power batteries has become increasingly wide, such as in energy storage power systems for hydropower, thermal power, wind power and solar power plants, as well as in power tools, military equipment, aerospace and other fields.

[0003] During the assembly and testing of power batteries, problems may occur such as electrolyte contamination of the battery casing or abnormal insulation between components that should be insulated, leading to short circuits in the battery casing. Summary of the Invention

[0004] In view of the above problems, this application provides a method and system for handling short circuits in the battery casing, which can at least partially solve the problem of short circuits in the battery casing.

[0005] To achieve the above objectives, a first aspect of this application provides a method for handling short circuits in the casing of a battery, comprising:

[0006] When a short circuit is detected between the battery casing and the first terminal of the battery, the second terminal of the battery is short-circuited; wherein, if the first terminal is positive, the second terminal is negative; if the first terminal is negative, the second terminal is positive.

[0007] Disconnect the short circuit between the battery casing and the second terminal, and let the battery stand for a preset time.

[0008] After the battery has been left to stand for a certain period of time, the potential difference between the casing and the first electrode is measured; and,

[0009] Based on the potential difference between the casing and the first electrode being within a preset range, determine the type of short circuit between the casing and the first electrode and whether the short circuit has been eliminated.

[0010] When a short circuit is detected between the battery casing and the first terminal, shorting the casing to the second terminal allows current to transfer between them, restoring the potential difference between the casing and the first terminal to normal. Allowing the battery to stand still eliminates the possibility of an internal short circuit within the casing. If, during the resting period, an internal short circuit re-emerges, causing the potential difference between the casing and the first terminal to become abnormal again, this is also addressed. After the battery has stood still for a preset time, the potential difference between the casing and the first terminal is measured. If the potential difference is within a preset range, the short circuit between the casing and the first terminal is considered an external short circuit and has been repaired. If the potential difference is outside the preset range, the short circuit is considered an internal short circuit and cannot be repaired. This approach repairs external short circuits by shorting the second terminal to the casing and allowing the battery to stand still, while also eliminating unrepairable internal short circuits, thus reducing safety issues caused by batteries with internal short circuits.

[0011] Based on the above scheme, according to the potential difference between the casing and the first electrode being within a preset range, the type of short circuit between the casing and the first electrode and whether the short circuit has been eliminated are determined, including:

[0012] When the potential difference between the casing and the first electrode is within a preset range, the short circuit type between the casing and the first electrode is determined to be an external short circuit and the external short circuit is eliminated.

[0013] Based on the above scheme, according to the potential difference between the casing and the first electrode being within a preset range, the type of short circuit between the casing and the first electrode and whether the short circuit has been eliminated are determined, including:

[0014] When the potential difference between the casing and the first electrode is outside the preset range, the short circuit type between the casing and the first electrode is determined to be an internal short circuit within the casing and the internal short circuit within the casing has not been eliminated.

[0015] The short circuit types of the above-mentioned internal and external short circuits of the casing can be determined by shorting between the second electrode and the casing, measuring the potential difference between the casing and the first electrode after the battery has been left to stand, and comparing whether the measured potential difference is within a preset range.

[0016] Based on the above scheme, the method also includes:

[0017] Before shorting the casing and the second electrode, clean the electrolyte on the casing.

[0018] By shorting between the casing and the second electrode, the removal of electrolyte can cause the residual electrolyte on the casing to transfer and cause a recurrence of the external short circuit after the external short circuit has been repaired, thus achieving a more thorough repair of the external short circuit.

[0019] Based on the above scheme, before short-circuiting the casing and the second electrode, clean the electrolyte on the casing, including:

[0020] The battery is immersed in an organic solvent containing the electrolyte to dissolve the electrolyte on the surface of the casing; and,

[0021] Batteries removed by organic solvents are soaked in volatile alcohols to remove residual organic solvents from the casing surface.

[0022] Electrolysis with organic solvents can clean away residual electrolyte on the outer surface of the battery casing. At the same time, soaking the battery in volatile alcohols can remove residual organic solvents and electrolytes from the battery casing surface by utilizing the volatility of alcohols, thus more thoroughly removing electrolyte from the outer surface of the battery casing.

[0023] Based on the above scheme, the time for immersing the battery in organic solvent is the first duration;

[0024] And / or,

[0025] The duration for which the alcohol-based substances are immersed in the battery is the second duration.

[0026] To ensure that the electrolyte on the outer surface of the casing is thoroughly removed, the duration of immersion of the battery in organic solvents and alcohols is limited.

[0027] Based on the above scheme, before short-circuiting the casing and the second electrode, clean the electrolyte on the casing, including:

[0028] Before soaking the battery in organic solvents, the battery is soaked in deionized water at a preset temperature to dissolve the electrolyte crystals on the surface of the casing.

[0029] Soaking the battery in hot deionized water can dissolve the electrolyte crystals on the surface of the casing, thus cleaning the outer surface of the casing more thoroughly.

[0030] Based on the above scheme, the battery immersion time in deionized water is the third duration.

[0031] In order to ensure that the electrolyte crystals on the outer surface of the casing are dissolved more thoroughly, the battery needs to be immersed in deionized water for a period of time up to three.

[0032] Based on the above scheme, the preset temperature is between 70 degrees Celsius and 90 degrees Celsius.

[0033] This preset temperature ensures that the crystals dissolve quickly and completely.

[0034] Based on the above scheme, before short-circuiting the casing and the second electrode, clean the electrolyte on the casing, including:

[0035] Ultrasonic waves are emitted into the battery while it is submerged.

[0036] The micro-vibrations caused by ultrasonic waves can clean the battery casing more thoroughly.

[0037] Based on the above scheme, the organic solvent includes at least one of the following:

[0038] Dimethyl carbonate;

[0039] Diethyl carbonate;

[0040] Dipropyl carbonate;

[0041] And / or,

[0042] Alcohols include:

[0043] Anhydrous ethanol and / or anhydrous methanol.

[0044] The aforementioned organic solvents and alcohols are all characterized by being easy to obtain and low in cost.

[0045] Based on the above scheme, the method also includes:

[0046] Before cleaning the electrolyte from the surface of the casing, seal the terminal of the second electrode of the battery.

[0047] By sealing the battery terminals, corrosion of the terminals can be reduced when the battery is immersed, thereby ensuring the lifespan of the repaired battery.

[0048] Based on the above solutions, the following are also included:

[0049] When the potential difference between the casing and the first electrode is detected to be outside the preset range, a short circuit is determined between the casing and the first electrode.

[0050] By detecting the potential difference between the casing and the first electrode, it is easy and quick to determine whether the battery casing is short-circuited.

[0051] Based on the above scheme, the preset duration is 6 to 54 hours.

[0052] The battery is left to stand for a preset time after the short circuit between the second terminal and the casing is broken. This allows the internal short circuit in the casing to discharge again, thereby detecting the internal short circuit as much as possible and preventing batteries with internal short circuits from entering the market.

[0053] A second aspect of this application provides a battery casing short-circuit handling system, comprising:

[0054] A shorting device is used to short-circuit the battery casing to the second terminal of the battery when a short circuit between the battery casing and the first terminal of the battery is detected; wherein, if the first terminal is positive, the second terminal is negative; if the first terminal is negative, the second terminal is positive.

[0055] The detection device is used to detect the potential difference between the casing and the first electrode after the short circuit between the casing and the first electrode is disconnected and the battery has been left to stand for a preset time.

[0056] An information processing device is used to determine the type of short circuit between the housing and the first electrode and whether the short circuit has been eliminated based on the potential difference between the housing and the first electrode within a preset range.

[0057] Based on the above scheme, the information processing device is specifically used to determine that the short circuit type between the housing and the first electrode is an external short circuit and to eliminate the external short circuit when the potential difference between the housing and the first electrode is within a preset range.

[0058] The information processing device is also specifically used to determine, when the potential difference between the housing and the first electrode is outside a preset range, that the short circuit type between the housing and the first electrode is an internal short circuit within the housing and that the internal short circuit within the housing has not been eliminated.

[0059] The information processing device can determine whether the short circuit between the housing and the first electrode has been eliminated and accurately select the short circuit inside the housing by checking whether the potential difference between the housing and the first electrode is outside a preset range.

[0060] Based on the above scheme, the system also includes:

[0061] A cleaning device is used to clean the electrolyte on the housing before short-circuiting the housing and the second electrode.

[0062] Based on the above solution, the cleaning device includes:

[0063] The container is used to sequentially immerse the battery in deionized water, the organic solvent of the electrolyte, and volatile alcohols at a preset temperature.

[0064] An ultrasonic transmitter is used to emit ultrasonic waves into a battery when it is submerged.

[0065] By introducing ultrasound, better cleaning can be achieved.

[0066] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0067] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0068] Figure 1 This is a schematic flowchart illustrating a method for handling short circuits in the casing of a battery, as provided in one embodiment of this application.

[0069] Figure 2 This is a schematic diagram of the structure of a battery provided in one embodiment of this application.

[0070] Figure 3 This is a schematic diagram of a battery and a second electrode shorted together, provided as an embodiment of this application.

[0071] Figure 4 This is a schematic flowchart illustrating a method for handling short circuits in the casing of a battery, as provided in one embodiment of this application.

[0072] Figure 5 This is a schematic diagram of a process for cleaning the electrolyte surface of a housing according to an embodiment of this application.

[0073] Figure 6 This is a schematic flowchart illustrating a method for handling short circuits in the casing of a battery, as provided in one embodiment of this application.

[0074] Figure 7 This is a schematic diagram illustrating the effect of a battery casing short-circuit handling method provided in one embodiment of this application.

[0075] Figure 8 This is a schematic diagram of a battery casing short-circuit handling system provided in one embodiment of this application. Detailed Implementation

[0076] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0078] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0079] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0080] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0081] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0082] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0083] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0084] Currently, short circuits may occur between the casing and the negative or positive terminal, and repairing short circuits between the casing and the positive or negative terminal of the battery is difficult. Moreover, after a period of repair, short circuits between the casing and the positive or negative terminal of the battery will occur again.

[0085] Research has revealed that residual electrolyte or metal particles between the battery casing and the battery terminals can cause an external short circuit between the casing and the corresponding terminal. This external short circuit reduces the potential difference between the casing and the positive terminal, or is equivalent to reducing the potential difference between the negative and positive terminals. Conversely, if part of the internal structure of the battery casing is damaged, an internal short circuit will occur between the casing and the positive or negative terminal.

[0086] Regarding external short circuits in the casing, if the casing is short-circuited to the negative terminal, the casing can be short-circuited to the positive terminal. This short circuit allows discharge from the positive terminal to the casing, increasing the potential difference between the casing and the negative terminal. Conversely, if the casing is short-circuited to the positive terminal, the casing can be short-circuited to the negative terminal. This short circuit allows discharge from the casing to the negative terminal, increasing the potential difference between the positive and negative terminals, thus restoring the potential difference between the casing and both terminals to normal.

[0087] After the potential difference between the casing and the positive and negative electrodes returns to normal, if the short circuit in the casing is an internal short circuit, it cannot be repaired by shorting it after a period of rest. The discharge of the internal short circuit during the resting period will cause the potential difference between the casing and the positive and negative electrodes to become abnormal again. Thus, by measuring the potential difference after resting, batteries that can be repaired by shorting can be selected, and batteries with internal short circuits that cannot be repaired can be selected.

[0088] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. This application provides an electrical device that uses a battery as a power source. This device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0089] The term "short circuit" used in the embodiments of this application can be understood as an electrical connection, such as using a flexible wire or metal wire to connect the second electrode and the housing to form a discharge connection between the second electrode and the housing.

[0090] The term "resting" used in the embodiments of this application can be understood as: being placed at room temperature (or normal temperature).

[0091] The term "organic solvent of electrolyte" used in the embodiments of this disclosure can be understood as: a solvent composed of any organic substance capable of dissolving the electrolyte.

[0092] The term "volatile alcohols" used in the embodiments of this disclosure can be understood as: various alcohol reagents having hydroxyl groups.

[0093] like Figure 1 As shown in the figure, this application embodiment provides a method for handling short circuits in the battery casing, including:

[0094] S110: When a short circuit is detected between the battery casing and the first terminal of the battery, the second terminal of the battery is short-circuited; wherein, if the first terminal is positive, the second terminal is negative; if the first terminal is negative, the second terminal is positive.

[0095] S120: Disconnect the short circuit between the battery casing and the second terminal, and let the battery stand for a preset time;

[0096] S130: After the battery has been left to stand for a certain period of time, the potential difference between the casing and the first electrode is detected; and,

[0097] S140: Based on the potential difference between the casing and the first electrode being within a preset range, determine the type of short circuit between the casing and the first electrode and whether the short circuit has been eliminated.

[0098] The battery can be a lithium battery or a sodium battery, or other power batteries.

[0099] refer to Figure 2 As shown, a battery may include: a casing, a positive terminal, a positive electrode plate, a negative terminal, and a negative electrode plate. The positive and negative terminals, collectively referred to as terminals, are exposed on the outside of the battery through an opening in the casing. The positive terminal is electrically connected to the positive electrode plate; the negative electrode plate is electrically connected to the negative terminal.

[0100] The casing can typically be a metal casing or an alloy casing. For example, the casing could be an aluminum casing. That is, the casing itself is also a conductor.

[0101] If the casing is short-circuited to the positive terminal, there will be external leakage. If the negative terminal is short-circuited to the casing, the battery's discharge capacity will be reduced, and the casing will be corroded and perforated, thus affecting the battery's safety.

[0102] If there is no short circuit between the casing and the battery, the potential of the positive electrode is higher than that of the casing; the potential of the casing is higher than that of the negative electrode, and the potential difference between the positive electrode and the casing needs to be greater than a preset value, and the potential difference between the casing and the negative electrode also needs to be greater than a preset value, in order to indicate that the insulation between the casing and the positive and negative electrodes is good enough.

[0103] Therefore, by using a detection device, the potential difference between the battery casing and the positive and negative terminals is detected. Based on whether the potential difference is within a preset range, it is determined whether a short circuit has occurred between the casing and the positive or negative terminal of the battery.

[0104] If a short circuit is detected between the battery casing and the first electrode, the second electrode of the battery is short-circuited to the casing, thereby removing ions (e.g., lithium ions or sodium ions) from the casing and reducing the risk of short circuits caused by ions accumulated on the casing coming into contact with the positive or negative electrode.

[0105] Short circuits between the battery casing and the positive and negative terminals are classified as internal short circuits and external short circuits.

[0106] Figure 2 The diagram shows a short circuit between the negative electrode and the casing, while the short circuit connects the positive electrode and the casing.

[0107] The main cause of external short circuits is that the surface of the casing is contaminated by electrolyte or metal, which causes a short circuit between the outside of the casing and the positive or negative terminal of the battery. This can be repaired by removing ions from the casing.

[0108] An internal short circuit occurs inside the battery casing and is relatively difficult to repair by removing ions or metals from the surface of the battery casing.

[0109] If the short circuit is an internal short circuit within the casing, the potential difference between the casing and the first electrode can be restored to normal after a period of time by shorting between the second electrode and the casing. However, after a period of rest, the internal short circuit within the casing is not actually eliminated. At this time, the potential difference between the casing and the first electrode will return to the abnormal value again during the time the battery is resting.

[0110] Therefore, in this embodiment, after disconnecting the short circuit between the casing and the second electrode, the battery needs to be left to stand for a preset time so that the inability to repair the internal short circuit of the casing will cause the potential difference between the casing and the first electrode to return to the abnormal value. This abnormal value can be any value within a preset range.

[0111] Thus, after the battery has been left to stand for a period of time, the potential difference between the first terminal and the casing is measured. If the potential difference is normal (e.g., within a preset range), it indicates that the short circuit between the first terminal and the casing has been eliminated, and the type of short circuit between the casing and the first terminal that can be eliminated is an external short circuit. If the measured potential difference is abnormal, it indicates that the short circuit between the first terminal and the casing has not been eliminated, and there is a very high probability that the type of short circuit between the casing and the first terminal is an internal short circuit.

[0112] An external short circuit can be considered a repairable housing anomaly, while an internal short circuit can be considered an unrepairable housing anomaly.

[0113] Typical external short circuits may include:

[0114] Electrolyte contamination of the casing can cause a short circuit between the electrolyte and the positive or negative terminal of the battery.

[0115] The overlap between the pole and the housing;

[0116] The overlap between the probes on the battery surface used for charging and discharging and the casing.

[0117] Typical internal short circuits in the housing may include:

[0118] The overlap between the tab and the housing; the tab is located inside the housing and is part of the electrode plate, serving as a connection structure between the electrode plate and the electrode post;

[0119] The overlap between the current collector and the casing, where the current collector is part of the electrode, and the electrode includes the current collector, with active material disposed on the current collector and portions of the current collector not coated with active material forming tabs. The active material contains lithium ions and sodium ions, and the battery's charging and discharging can be achieved through ion migration.

[0120] The separator is damaged; the separator is located between the positive and negative electrodes, separating them.

[0121] The insulating film (e.g., mylar) is damaged;

[0122] An abnormal resistance is found in the insulator near the opening of the battery casing. This opening allows the terminal to extend out, and the insulator is designed to insulate the terminal from the casing. However, an abnormally low resistance in the insulator can cause a short circuit between the terminal and the casing, and this short circuit occurs inside the casing. This opening is covered by an end cap outside the main body of the casing; that is, the insulator is located inside the end cap.

[0123] In S110, short-circuiting the housing and the first electrode may include connecting the terminal of the first electrode and the housing using a wire. For example, a guide vane is used to contact both the housing and the terminal of the first electrode, thereby achieving a short circuit through the contact between the conductors.

[0124] In some embodiments, if the short circuit type is an internal short circuit within the casing, the battery will be scrapped to ensure battery safety. To reduce unnecessary scrapping, it is necessary to repeat the above casing short circuit handling method once for batteries whose short circuit type is determined to be an internal short circuit within the casing, and to avoid unnecessary scrapping of the battery due to misjudgment of the judgment result of an internal short circuit within the casing.

[0125] Therefore, in this embodiment of the present disclosure, by utilizing the short circuit between the second electrode of the battery and the casing, the battery being left to stand, and the potential difference between the casing and the first electrode, the type of short circuit between the casing and the first electrode can be easily determined, and the type of external short circuit of the casing can be eliminated.

[0126] refer to Figure 3As shown, when repairing the short circuit between the first electrode and the casing, multiple batteries with short circuits between the casing and the first electrode can be repaired in batches.

[0127] For example, S140 may include:

[0128] When the potential difference between the casing and the first electrode is within a preset range, the short circuit type between the casing and the first electrode is determined to be an external short circuit and the external short circuit is eliminated.

[0129] Different active materials in a battery result in different preset ranges. For example, taking lithium batteries as an example, for ternary polymer lithium batteries, the preset range can be a range greater than or equal to a preset value. This preset value can be 2V or any value within a specific range with 2V as the median.

[0130] For lithium iron phosphate batteries, the preset range can be a range greater than or equal to a preset value, which can be a range with 1.5V as the median. For example, the preset value range can be between 1 and 3.5V.

[0131] When the first pole is both positive and negative, the preset values ​​for defining the preset range can be the same or different.

[0132] For example, when the first electrode is both positive and negative, the preset value for the negative electrode can be slightly larger than the preset value for the positive electrode.

[0133] For example, for a ternary polymer lithium battery, if the voltage between the negative electrode and the casing is less than 1.5V, it can be considered that there is a short circuit between the negative electrode and the casing; if the voltage between the positive electrode and the casing is less than 1V, it can be considered that there is a short circuit between the positive electrode and the casing. If the voltage between the negative electrode and the casing is greater than or equal to 1.5V, it can be considered that there is no short circuit between the negative electrode and the casing; if the voltage between the positive electrode and the casing is greater than or equal to 1V, it can be considered that there is no short circuit between the positive electrode and the casing.

[0134] For example, regarding lithium iron phosphate batteries, if the voltage between the negative electrode and the casing is less than 2V, it can be considered a short circuit between the negative electrode and the casing; if the voltage between the positive electrode and the casing is less than 1.5V, it can be considered a short circuit between the positive electrode and the casing. If the voltage between the negative electrode and the casing is greater than or equal to 2V, it can be considered that there is no short circuit between the negative electrode and the casing; if the voltage between the positive electrode and the casing is greater than or equal to 1.5V, it can be considered that there is no short circuit between the positive electrode and the casing. Of course, the above are just examples.

[0135] By shorting, letting it stand, and measuring again, it was found that the potential difference between the casing and the first electrode was within the preset range, indicating that the potential difference between the casing and the first electrode had returned to normal. Therefore, it can be considered that the short circuit between the casing and the first electrode has been repaired, and this type of short circuit is the external type of the casing.

[0136] In another embodiment, S140 may include: when the potential difference between the housing and the first electrode is outside a preset range, determining that the short circuit type between the housing and the first electrode is an internal short circuit within the housing and that the internal short circuit within the housing has not been eliminated.

[0137] At the beginning of the short circuit, the potential difference between the casing and the first electrode returns to the normal value. However, after a period of rest, if the short circuit between the casing and the first electrode is an internal short circuit, the loop formed by the internal short circuit will cause the potential difference between the casing and the first electrode to become abnormal again. Therefore, if the measured potential difference is outside the preset range, it can be considered that the short circuit between the casing and the first electrode has not been eliminated, and the type of short circuit between the casing and the first electrode at this time is an unrepairable internal short circuit.

[0138] In some embodiments, such as Figure 4 As shown, the method also includes:

[0139] S100: Clean the electrolyte on the housing before shorting the housing and the second electrode.

[0140] To reduce the movement of electrolyte remaining on the casing after the external short circuit is eliminated, which could cause a re-short circuit between the casing and the first and second terminals of the battery, thus more thoroughly eliminating the external short circuit.

[0141] In this embodiment of the present disclosure, before shorting between the casing and the first electrode, the electrolyte on the casing is first cleaned. By cleaning the electrolyte on the outer surface of the casing, the time required to eliminate the abnormality of the short circuit can be reduced, and the abnormality caused by the external short circuit of the casing can be eliminated more thoroughly.

[0142] Here, before short-circuiting the casing and the second electrode, cleaning the electrolyte on the casing may include at least:

[0143] Before shorting the casing and the second electrode, clean the electrolyte between the casing and the first electrode post.

[0144] Thus, when cleaning the electrolyte on the casing using various solutions, it is necessary to immerse the first electrode post and the casing near the first electrode post in the corresponding solvent. For example, it is also necessary to immerse the first electrode post and part of the casing in deionized water, organic solutions of electrolyte, and volatile alcohols.

[0145] like Figure 5 As shown, S100 may include:

[0146] S102: The battery is soaked in an organic solvent of the electrolyte to dissolve the electrolyte on the surface of the casing;

[0147] S104: The battery removed by organic solvent is soaked in a volatile alcohol to remove residual organic solvent from the casing surface.

[0148] In one embodiment, the organic solvent in the electrolyte can be used to dissolve the electrolyte on the surface of the battery casing, thus cleaning the electrolyte on the casing surface. The battery can then be removed from the organic solvent.

[0149] The organic solvent includes, but is not limited to, various carbonates.

[0150] In this embodiment of the disclosure, in order to further reduce the short circuit between the positive and negative electrodes of the battery and the battery caused by the electrolyte dissolved by the residual organic solvent on the battery casing after the battery is removed from the organic solvent, highly volatile alcohols are used to dissolve the organic solvent and the high volatility of the alcohols is used to quickly evaporate the organic solvent.

[0151] By increasing the concentration of alcohols, their volatility can be ensured. Therefore, by soaking the battery again in alcohols, the electrolyte and / or metal substances on the surface of the battery casing can be more thoroughly removed.

[0152] In some embodiments, the duration of immersion of the battery in the organic solvent is a first duration;

[0153] And / or,

[0154] The duration for which the alcohol-based substances are immersed in the battery is the second duration.

[0155] The first duration and the second duration can be equal or unequal.

[0156] For example, both the first and second durations can be between 5 and 30 minutes.

[0157] Preferably, the first duration and the second duration can be 5 min, 10 min or 15 min, and the specific duration can be determined according to the volume of the battery and / or the shape of the casing, etc.

[0158] In one embodiment, such as Figure 5 As shown, S100 also includes:

[0159] S101: Before soaking the battery in organic solvent, soak the battery in deionized water at a preset temperature to dissolve the electrolyte crystals on the surface of the casing.

[0160] If the battery casing becomes contaminated with electrolyte, crystals may form in a relatively dry external environment. To better remove these crystals and reduce the risk of recurrence due to incomplete crystal removal after external short-circuit repair, the battery can be soaked in deionized water at a preset temperature. This will dissolve the crystals on the casing.

[0161] Using deionized water, which has low conductivity, improves the safety of the treatment process.

[0162] In one embodiment, the battery is immersed in deionized water for a third duration.

[0163] The third duration may be equal to or different from the first and / or second duration.

[0164] For example, the value range for the third duration can also be between 5 and 30 minutes.

[0165] In one embodiment, the preset temperature is between 70 and 90 degrees Celsius.

[0166] Setting the temperature of deionized water between 70 and 90 degrees Celsius allows the electrolyte crystals to dissolve more fully in the deionized water at extremely high temperatures.

[0167] Preferably, the preset temperature can be between 75 degrees Celsius and 85 degrees Celsius, and more preferably, the preset temperature can be between 80 degrees Celsius and 85 degrees Celsius.

[0168] In some embodiments, S100 further includes:

[0169] S106: Emits ultrasonic waves to the battery while it is submerged.

[0170] When the battery is immersed in deionized water, organic solvents, and alcohols in sequence, ultrasonic waves are emitted into the battery. The ultrasonic waves make the electrolyte crystals, electrolyte or metal particles on the surface of the casing cleaner.

[0171] In one embodiment, the organic solvent includes at least one of the following:

[0172] Dimethyl carbonate;

[0173] Diethyl carbonate;

[0174] Dipropyl carbonate;

[0175] In another embodiment, the alcoholic substance includes:

[0176] Anhydrous ethanol and / or anhydrous methanol.

[0177] Of course, the above are just examples of organic solvents and alcohols, and the specific implementation is not limited to these examples.

[0178] In this embodiment of the disclosure,

[0179] In some embodiments, such as Figure 6 As shown, the battery casing short-circuit handling method also includes:

[0180] S002: Seal the second electrode post of the battery before cleaning the electrolyte from the surface of the casing.

[0181] For example, the second electrode post can be wrapped with waterproof glue or waterproof membrane to prevent oxidation of the second electrode post when the battery is immersed in liquids such as deionized water, thereby ensuring normal use of the battery after the external short circuit is repaired.

[0182] In some embodiments, the method further includes:

[0183] S001: When the potential difference between the casing and the first electrode is detected to be outside the preset range, a short circuit is determined between the casing and the first electrode.

[0184] For example, by using a voltmeter or other means, the potential difference between the casing and the positive or negative terminal of the battery can be measured, and the short circuit between the casing and the first terminal can be determined based on the measured potential difference.

[0185] If the potential difference between the casing and the first electrode is outside the preset range, it indicates that the potential difference between the casing and the first electrode is abnormal, and a short circuit has occurred between the casing and the first electrode. The external short circuit can be eliminated by the casing short circuit handling method provided by any of the aforementioned technical solutions, or the internal short circuit can be determined to scrap the battery to avoid safety problems caused by the battery entering use.

[0186] After detecting a short circuit between the housing and the first electrode, performing S110 to S140 at least once can eliminate the short circuit in the housing.

[0187] In one embodiment, the preset time for resting after the second electrode and the housing are short-circuited is 6 to 54 hours.

[0188] Preferably, the preset duration can be 24 hours, 36 hours, or 48 hours.

[0189] If the preset duration is 24 hours, 36 hours, or 48 hours, even a tiny internal short circuit between the casing and the first electrode can be detected, thus more accurately screening out abnormal batteries with irreparable internal short circuits in the casing.

[0190] Figure 7 This is a comparison diagram showing the effect before and after repairing a short circuit between the negative electrode of the casing and the casing using the casing short-circuit repair method provided in this application embodiment. Figure 7 The horizontal axis represents the date and time, and the vertical axis represents the potential difference between the negative electrode and the casing.

[0191] like Figure 8 As shown, this disclosure provides a battery casing short-circuit handling system, including:

[0192] The shorting component 110 is used to short-circuit the battery casing and the battery's second terminal when a short circuit between the battery casing and the battery's first terminal is detected; wherein, if the first terminal is positive, the second terminal is negative; if the first terminal is negative, the second terminal is positive.

[0193] The detection device 120 is used to detect the potential difference between the casing and the first electrode after the battery has been left to stand for a preset time after the short circuit between the casing and the first electrode is disconnected.

[0194] The information processing device 130 is used to determine the type of short circuit between the housing and the first electrode and whether the short circuit has been eliminated based on the potential difference between the housing and the first electrode within a preset range.

[0195] The jumper 110 includes, but is not limited to, at least one of the following:

[0196] The flexible wire has connecting terminals, with its two ends contacting the housing and the pole of the first pole, respectively, thereby achieving a short circuit between the housing and the first pole;

[0197] The guide plate is in contact with the housing and the first electrode respectively, and the short circuit between the housing and the first electrode is shorted through the contact between the conductors.

[0198] The detection device 120 includes, but is not limited to, electronic instruments such as voltmeters that can measure the potential difference between the first electrode and the casing.

[0199] The information processing device 130 includes, but is not limited to, a desktop computer, a laptop computer, or a microprocessor or embedded controller integrated with the detection device 120.

[0200] In one embodiment, the information processing device 130 may be disposed separately from the detection device 120. In another embodiment, the information processing device 130 may also be electrically connected to the detection device 120, so that the information processing device can determine whether the short circuit between the housing and the first pole has been repaired based on the potential difference detected by the detection device 120, and determine that the short circuit type of the housing is an unrepairable internal short circuit when the short circuit between the housing and the first pole has not been repaired.

[0201] By using the above-mentioned casing short-circuit handling system, it is possible to repair external short circuits in the battery casing as easily as possible, while eliminating batteries with internal short circuits, thereby ensuring the yield of batteries before they leave the factory and ensuring the safety of battery use.

[0202] In some embodiments, the information processing device 130 is specifically configured to determine, when the potential difference between the housing and the first electrode is within a preset range, that the short circuit type between the housing and the first electrode is an external short circuit and that the external short circuit is eliminated.

[0203] In other embodiments, the information processing device 130 is further specifically configured to determine, when the potential difference between the housing and the first electrode is outside a preset range, that the short circuit type between the housing and the first electrode is an internal short circuit within the housing and that the internal short circuit within the housing has not been eliminated.

[0204] In some embodiments, the system further includes:

[0205] A cleaning device is used to clean the electrolyte on the housing before short-circuiting the housing and the second electrode.

[0206] A cleaning device is used to clean the electrolyte on the casing between the short-circuited casing and the second electrode, thereby reducing the risk of re-short-circuiting between the casing and the first electrode after the battery has been repaired by shorting the casing and the second electrode, due to the electrolyte not being completely removed from the casing surface.

[0207] In some embodiments, the cleaning device includes:

[0208] The container is used to sequentially immerse the battery in deionized water, the organic solvent of the electrolyte, and volatile alcohols at a preset temperature.

[0209] An ultrasonic transmitter is used to emit ultrasonic waves into a battery when it is submerged.

[0210] A container is used to hold deionized water, organic solvents for electrolytes, and volatile alcohols, etc., and then the battery that needs to be short-circuited by the casing is immersed in the container containing the above substances.

[0211] An ultrasonic transmitter can emit ultrasonic waves. When a battery is immersed in liquid in a container, it emits ultrasonic waves to the battery. The vibrations caused by the ultrasonic waves clean the surface of the battery casing more effectively.

[0212] Of course, in some embodiments, the system also includes:

[0213] Sealing devices, such as the terminal post of the second electrode, are used to wrap and seal the battery before cleaning.

[0214] The sealing device may include: a robotic arm that wraps waterproof tape around the post of the second electrode, or an adhesive applicator that coats the surface of the post of the second electrode with a waterproof adhesive layer, etc.

[0215] Of course, this is just an example of a sealing device, and the specific implementation is not limited to this example.

[0216] The following example uses lithium-ion batteries to illustrate this:

[0217] The lithium-ion battery industry is developing rapidly, especially power batteries, which are receiving increasing attention. CATL's first-generation sodium-ion battery has garnered widespread attention, marking a significant leap from laboratory research to large-scale commercial application. During the manufacturing and testing of aluminum-cased lithium-ion or sodium-ion batteries, the negative electrode may short-circuit with the casing. Based on the location of the short circuit, it can be categorized as: internal short circuit (or simply internal short circuit) and external short circuit (or simply external short circuit).

[0218] Causes of internal short circuits include, but are not limited to: negative electrode tab connection, current collector connection, diaphragm / Mylar membrane damage, and abnormal resistance of end cap plastic parts.

[0219] Causes of external short circuits include, but are not limited to: electrolyte contamination of the negative electrode post and metal / probe contact of the negative electrode post.

[0220] When the negative electrode and the casing are short-circuited, the galvanic cell composed of the aluminum casing and the negative electrode will form a complete closed circuit. In this galvanic cell, the aluminum casing acts as the positive electrode, and the negative electrode acts as the negative electrode. Lithium ions in the electrolyte will continuously embed into the aluminum casing to form LixAl (lithium-aluminum alloy, i.e., corrosion products). At this time, the electrode potential of the aluminum casing will decrease rapidly, and the potential difference between the aluminum casing and the negative electrode will be greatly reduced.

[0221] The Li x Al compound has a loose structure, and the aluminum shell will be corroded and perforated if the reaction is carried out for a long time.

[0222] The technical problem to be solved by this disclosure is to screen and distinguish between short circuits between the negative electrode and the internal casing and short circuits between the negative electrode and the external casing, and to repair the internal corrosion of the battery casing caused by the short circuit between the negative electrode and the casing.

[0223] This application provides a method for self-repairing corrosion inside a battery casing.

[0224] A potential difference test is performed between the negative electrode and the casing to identify defective products. For example, if the measured potential difference between the negative electrode and the casing is less than V0, the battery is considered defective. The value of V0 can range from 1 to 3.5V.

[0225] For defective products, a wire is used to short-circuit the positive terminal of the battery and the casing for a period of time to allow the Li embedded in the aluminum casing to be extracted in order to achieve the purpose of repair. The repaired battery is then left to stand at room temperature for a period of time, and then the potential difference between the negative terminal and the casing is re-measured.

[0226] If the retested potential difference is greater than or equal to V0, the battery is considered repaired.

[0227] If the potential difference measured during retesting is less than V0, the battery is considered unrepairable, indicating an internal short circuit between the negative electrode and the casing.

[0228] This method can easily and quickly distinguish between internal short circuits between the negative electrode and the casing and external short circuits between the negative electrode and the casing, reducing the risk of battery flow to the customer due to internal short circuits between the negative electrode and the casing, which could cause safety accidents.

[0229] This method can quickly and easily repair internal corrosion of the battery casing caused by external short circuits between the negative electrode and the casing, without the need for additional repair equipment. It reduces false rejections during negative electrode-to-casing voltage testing due to external short circuits (temporary external short circuits caused by electrolyte, metal, etc.), improving battery manufacturing yield and saving costs.

[0230] Before repairing the battery by short-circuiting between the positive terminal and the casing, the negative terminal is cleaned: ultrasonic cleaning is performed using hot water, diethyl carbonate (DEC), and anhydrous ethanol, respectively.

[0231] After repair, the screen is left to stand at room temperature to distinguish between internal short circuits between the negative electrode and the casing and external short circuits between the negative electrode and the casing.

[0232] This method is applicable to both aluminum-cased lithium-ion batteries and sodium-ion batteries; the above is merely an example using lithium batteries.

[0233] This method can quickly and easily repair internal corrosion of the battery casing caused by a short circuit between the negative electrode and the casing, allowing Li or Na ions in the Li x Al compounds that have been generated on the aluminum casing to be released, thereby restoring the potential difference between the negative electrode and the casing to normal.

[0234] For batteries that are short-circuited between the negative electrode and the outer casing due to electrolyte contamination, ultrasonic cleaning with hot water, DEC, and anhydrous ethanol can be performed before repair to effectively remove residual electrolyte and prevent it from absorbing water and re-conducting the negative electrode post and casing during subsequent use.

[0235] This method can easily and quickly distinguish between internal short circuits between the negative electrode and the casing and external short circuits between the negative electrode and the casing, reducing the risk of battery leakage to the customer due to internal short circuits between the negative electrode and the casing, which could cause safety accidents.

[0236] This embodiment provides a self-repair method for internal corrosion of battery casing. First, the positive terminal is sealed with insulating and waterproof tape. Then, the negative terminal is immersed in hot water (30-85℃ deionized water), DEC, and anhydrous ethanol in sequence for ultrasonic cleaning for 5-60 minutes. Then, it is taken out and dried.

[0237] After cleaning, remove the insulating and waterproof tape from the positive terminal, and then connect the positive terminal of the battery to the casing with a conductor (copper wire, aluminum wire, or other metal wire).

[0238] Remove the wires after 0.2-24 hours of repair. After connecting the wires to the positive terminal and the casing, allow the battery with the wires connecting the positive terminal and the casing to stand at room temperature. This room temperature can be ±25 degrees Celsius.

[0239] After repair, the battery should be left to stand at room temperature for 1-48 hours.

[0240] Then measure the negative electrode-casing voltage, and discard batteries with a potential difference less than the specified value V0. The remaining batteries are the repaired batteries.

[0241] The principle of cleaning the electrolyte in lithium batteries can be summarized as follows:

[0242] Hot water accelerates the dissolution and decomposition of electrolyte crystals, for example, dissolving LiPF6 in the electrolyte.

[0243] Organic solvents such as DEC can be used to dissolve residual electrolyte and additives, while volatile alcohols such as ethanol can be used to dissolve and clean residual DEC on the negative electrode post.

[0244] Self-repair mechanism

[0245] After the positive terminal and the casing are connected by a wire, the galvanic cell composed of the positive terminal and the casing forms a closed circuit, that is, the galvanic cell composed of the positive terminal and the casing discharges:

[0246] Positive electrode (LiFePO4): FePO4 + xLi+ + xe- → xLiFePO4 + (1-x)FePO4 Negative electrode (Al): Li xAl ↔ Al + x Li++x e-

[0247] Previously embedded Li was deintercalated from the aluminum shell, causing the electrode potential of the aluminum shell to increase, meaning the potential difference between the positive electrode and the shell decreased. Because...

[0248] The potential difference between the positive and negative electrodes is the sum of the potential difference between the positive electrode and the casing, and the potential difference between the casing and the negative electrode. Therefore, if the potential of the casing increases, the potential difference between the casing and the negative electrode increases. Thus, after a period of repair, the potential difference between the casing and the negative electrode will return to its normal value.

[0249] Furthermore, the positive terminal and the casing can be connected by a wire, such as... Figure 2 As shown, or by using self-designed equipment for batch repair, such as Figure 3 As shown, the device probes will contact the positive terminal and the housing respectively, and the positive terminal and the housing will be connected through the internal circuit.

[0250] The negative electrode of the defective lithium-ion battery was immersed in 80°C hot water, DEC, and anhydrous ethanol for ultrasonic cleaning for 15 minutes each, and then removed and dried.

[0251] Connect the positive terminal of the cleaned battery to the casing using copper wires, then allow it to heal at room temperature for 2 hours before removing the wires.

[0252] After repair, the potential difference between the negative electrode and the casing was measured. After standing at room temperature for 48 hours, the voltage between the negative electrode and the casing was measured again.

[0253] If the voltage measured again is less than the specified value V0, the battery is discarded, and the other batteries are considered repaired batteries.

[0254] Test the potential difference between the negative electrode and the casing to identify defective products (those with a potential difference less than the specified value V1; the specified value for the negative electrode-casing voltage varies for different types of batteries).

[0255] The negative electrode of the sodium-ion battery was immersed in 80°C hot water, DEC, and anhydrous ethanol for ultrasonic cleaning for 15 minutes each, and then removed and air-dried.

[0256] Connect the positive terminal of the cleaned battery to the casing using copper wires, then allow it to heal at room temperature for 2 hours before removing the wires.

[0257] After repair, the potential difference between the negative electrode and the casing is measured. After standing at room temperature for 48 hours, the voltage between the negative electrode and the casing is measured again. If the voltage measured again is less than the specified value V0, the battery is discarded. The other batteries are the batteries that have been repaired.

[0258] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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 or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery case short-circuit processing method characterized by comprising: The method comprises: short-circuiting the shell and the second pole of the battery when a short circuit between the shell and the first pole of the battery is detected; wherein, if the first pole is a positive pole, the second pole is a negative pole; if the first pole is a negative pole, the second pole is a positive pole; disconnecting the short circuit between the shell and the second pole of the battery, and leaving the battery for a preset time period; detecting a potential difference between the shell and the first pole after the battery is left for the preset time period; and determining the type of short circuit between the shell and the first pole and whether the short circuit is eliminated according to whether the potential difference between the shell and the first pole is within a preset range; wherein, when the potential difference between the shell and the first pole is within the preset range, it is determined that the short circuit between the shell and the first pole is an external shell short circuit and the external shell short circuit is eliminated.

2. The method of claim 1, wherein, The determination of the type of short circuit between the shell and the first pole and whether the short circuit is eliminated according to whether the potential difference between the shell and the first pole is within a preset range comprises: when the potential difference between the shell and the first pole is outside the preset range, it is determined that the short circuit between the shell and the first pole is an internal shell short circuit and the internal shell short circuit is not eliminated.

3. The method according to any one of claims 1 to 2, characterized in that, The method further comprises: cleaning the electrolyte on the shell before short-circuiting the shell and the second pole.

4. The method of claim 3, wherein, The cleaning of the electrolyte on the shell before short-circuiting the shell and the second pole comprises: immersing the battery in an organic solvent of the electrolyte to dissolve the electrolyte on the surface of the shell; and immersing the battery taken out by the organic solvent in an alcohol substance with volatile to remove the residual organic solvent on the surface of the shell.

5. The method of claim 4, wherein the time period for immersing the battery in the organic solvent is a first time period; and / or the time period for immersing the battery in the alcohol substance is a second time period. The cleaning of the electrolyte on the shell before short-circuiting the shell and the second pole comprises:

6. The method according to claim 4 or 5, characterized in that, immersing the battery in deionized water at a preset temperature before immersing the battery in the organic solvent to dissolve the crystallization of the electrolyte on the surface of the shell. The time period for immersing the battery in the deionized water is a third time period.

7. The method of claim 6, wherein, The preset temperature is between 70 degrees Celsius and 90 degrees Celsius.

8. The method according to claim 6, wherein, The cleaning of the electrolyte on the shell before short-circuiting the shell and the second pole comprises:

9. The method of claim 4 or 5, wherein, emitting ultrasonic waves to the battery while the battery is immersed. The organic solvent comprises at least one of:

10. The method according to any one of claims 4 to 5, characterized in that, dimethyl carbonate; diethyl carbonate; dipropyl carbonate; and / or The alcohol substance comprises: anhydrous ethanol and / or anhydrous methanol. The method further comprises: sealing the pole column of the second pole before cleaning the electrolyte on the surface of the shell.

11. The method according to any one of claims 4 to 5, characterized in that, The method further comprises: determining the short circuit between the shell and the first pole when the potential difference between the shell and the first pole is outside the preset range.

12. The method according to any one of claims 1 to 2, characterized in that, The preset time period is 6 to 54 hours. The method comprises:

13. The method according to any one of claims 1 to 2, characterized in that, ​ 14. A battery case short-circuit processing system characterized by comprising: ​ a shorting member for shorting a housing of a battery and a second pole of the battery when a short circuit between the housing and a first pole of the battery is detected, wherein the second pole is negative if the first pole is positive, and the second pole is positive if the first pole is negative; a detection device for detecting a potential difference between the housing and the first pole after the battery is left for a preset time period after the short circuit between the housing and the first pole is disconnected; an information processing device for determining a type of the short circuit between the housing and the first pole and whether the short circuit is eliminated according to the potential difference between the housing and the first pole being within a preset range, wherein when the potential difference between the housing and the first pole is within the preset range, it is determined that the type of the short circuit between the housing and the first pole is a housing external short circuit and the housing external short circuit is eliminated.

15. The system of claim 14, wherein, The information processing device is further specifically configured to determine that the type of the short circuit between the housing and the first pole is a housing internal short circuit and the housing internal short circuit is not eliminated when the potential difference between the housing and the first pole is outside the preset range.

16. The system of any one of claims 14 to 15, wherein, The system further comprises: a cleaning device for cleaning electrolyte on the housing before the housing and the second pole are shorted.

17. The system of claim 16, wherein, The cleaning device comprises: a container for sequentially immersing the battery in deionized water, organic solvent of electrolyte and alcohol with volatile alcohol substance at a preset temperature; an ultrasonic transmitter for transmitting ultrasonic waves to the battery when the battery is immersed.

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