CN116413625A - Method, device and system for early warning of short circuit in battery, power utilization device and storage medium - Google Patents

Method, device and system for early warning of short circuit in battery, power utilization device and storage medium Download PDF

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Publication number
CN116413625A
CN116413625A CN202210006662.4A CN202210006662A CN116413625A CN 116413625 A CN116413625 A CN 116413625A CN 202210006662 A CN202210006662 A CN 202210006662A CN 116413625 A CN116413625 A CN 116413625A
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China
Prior art keywords
battery
current
short circuit
internal short
voltage
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CN202210006662.4A
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谢岚
林真
林时良
黄珊
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to CN202210006662.4A priority Critical patent/CN116413625A/en
Publication of CN116413625A publication Critical patent/CN116413625A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Tests Of Electric Status Of Batteries (AREA)

Abstract

The embodiment of the application provides a battery internal short circuit early warning method, device, system, power utilization device and storage medium. The detection method comprises the following steps: comprising the following steps: acquiring a first voltage of a battery charged to a first preset charge state; controlling the battery to charge at a constant first voltage; acquiring a first current of a battery after being charged for a preset time at a constant first voltage; and judging whether the battery is internally short-circuited according to the first current. According to the embodiment of the application, the first current charged under the first voltage of the battery is equivalent to the leakage current, and whether the battery is internally short-circuited or not is judged according to the first current, so that the accuracy and the high efficiency of judging the internal short-circuit of the battery are greatly improved.

Description

Method, device and system for early warning of short circuit in battery, power utilization device and storage medium
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method, an apparatus, a system, an electric device, and a storage medium for early warning of an internal short circuit of a battery.
Background
The lithium ion battery is widely applied to the fields of new energy automobiles, energy storage and the like due to the advantages of high energy density, cyclic charging and the like. However, internal short circuits due to external factors and changes in the internal structure of the battery often occur during the processing and use of the lithium ion battery. When the battery is in internal short circuit, serious safety accidents such as explosion and the like are caused easily due to thermal runaway of the battery.
Therefore, a method for accurately identifying the internal short circuit of the battery is needed to avoid the safety problem caused by the internal short circuit.
Disclosure of Invention
The application provides a battery internal short circuit early warning method, a device, a system, an electricity utilization device and a storage medium, which can accurately identify the battery internal short circuit and further prevent the occurrence of safety accidents.
In a first aspect, the present application provides a method for early warning of an internal short circuit of a battery, including: acquiring a first voltage of a battery charged to a first preset charge state; controlling the battery to charge at a constant first voltage; acquiring a first current of a battery after being charged for a preset time at a constant first voltage; and judging whether the battery is internally short-circuited according to the first current.
In this embodiment, when the battery takes place the internal short circuit, can produce leakage current in the battery, this application is through the first electric current equivalent of charging of battery under first voltage for leakage current to judge whether the battery takes place the internal short circuit according to first electric current, improved the accuracy and the high efficiency of the internal short circuit judgement of battery by a wide margin.
In one possible implementation, determining whether an internal short circuit occurs in the battery according to the first current includes: when the first current is larger than the threshold current, judging that the battery is in internal short circuit; or when the first current is smaller than or equal to the threshold current, judging that the internal short circuit of the battery does not occur.
In this embodiment, the leakage current generated by the internal short circuit of the battery is greater than the leakage current generated by the normal chemical reaction inside the battery, so that whether the internal short circuit of the battery occurs can be identified by obtaining the leakage current of the battery and comparing the leakage current with the leakage current of the normal battery, i.e., the threshold current. When the first current of the battery under the first voltage is equivalent to the leakage current, whether the internal short circuit of the battery occurs can be rapidly and accurately judged by comparing the first current with the threshold current, so that the safety problem caused by the internal short circuit is avoided.
In one possible implementation manner, the method for early warning of the short circuit in the battery further comprises: and determining the threshold current according to the relationship between the charging time and the charging current of the battery charged at a constant first voltage after the battery is charged to the first charge preset state for the first time.
In this embodiment, the internal short circuit of the battery is usually generated after multiple times of charging due to lithium precipitation, so that the leakage current generated when the battery is charged to the first voltage for the first time can be used as the leakage current without the internal short circuit, so as to simplify the internal short circuit detection method and improve the detection efficiency.
In one possible implementation manner, whether the battery is in an internal short circuit is judged according to the relation between the first current and the second current, wherein the second current is a current after the battery is charged to a first charge preset state for a preset time at a constant first voltage.
In this embodiment, after the internal short circuit occurs in the battery, the leakage current of the battery increases with the increase of the internal short circuit time, so that the internal short circuit of the battery is judged by utilizing the relationship of the leakage currents of the battery in the two charging processes before and after, and the charging process of the battery is utilized, thereby having higher practicability.
In one possible implementation, determining whether the battery is shorted according to the relationship between the first current and the second current includes: when the difference value of the first current and the second current is larger than a preset threshold value, judging that the battery is in internal short circuit; or when the difference value of the first current and the second current is smaller than or equal to a preset threshold value, judging that the battery is not internally short-circuited.
In this embodiment, the battery is internally shorted, and the leakage current of the battery increases with the increase of the charging times, so that whether the battery is shorted can be directly determined by comparing the difference value between the second current and the first current of the two charges before and after, and the determination logic is simple.
In one possible implementation, the preset threshold is less than or equal to 1mA.
In the embodiment, the battery with the internal short circuit can not be detected due to the fact that the preset threshold is too large, and the battery with the internal short circuit can be accurately identified when the preset threshold is smaller than or equal to 1mA, so that the safety performance of the battery in the use process is improved.
In one possible implementation manner, the method for early warning of the short circuit in the battery further comprises: and stopping charging the battery and giving an alarm when the internal short circuit of the battery is determined.
In the embodiment, the user can be reminded to respond in advance by stopping charging the battery in time and giving an alarm, so that the probability of safety accidents is reduced.
In a second aspect, there is provided an intra-battery short-circuit warning device, including: the acquisition module is used for acquiring a first voltage of the battery charged to a first preset charge state; a control module for controlling the battery to charge at a constant first voltage; the acquisition module is also used for acquiring a first current of the battery after the battery is charged for a preset time at a constant first voltage; and the determining module is used for judging whether the battery is internally short-circuited according to the first current.
In one possible implementation manner, the determining module is configured to determine that an internal short circuit occurs in the battery when the first current is greater than the threshold current; or when the first current is smaller than or equal to the threshold current, judging that the internal short circuit of the battery does not occur.
In one possible implementation, the determining module is further configured to determine the threshold current according to a relationship between a charging time and a charging current of charging at a constant first voltage after the battery is charged to the first preset state of charge for the first time.
In a third aspect, a battery management system is provided, including the in-battery short-circuit warning device in the second aspect or any possible implementation manner of the second aspect.
In a fourth aspect, there is provided an electrical device comprising the battery management system of the third aspect.
In a fifth aspect, there is provided a computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when invoked by a processor, cause the processor to perform the method of the first aspect or any possible implementation of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a battery system according to one embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a method for early warning of an internal short circuit in a battery according to an embodiment of the present disclosure;
FIG. 3 is a method of determining an internal short circuit based on a first current in accordance with an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of yet another method for determining an internal short circuit based on a first current in accordance with an embodiment of the disclosure;
FIG. 5 is a schematic diagram of a battery according to an embodiment of the present disclosure after being charged for a predetermined time at a first voltage;
FIG. 6 is a schematic diagram of another method of early warning of an internal battery short circuit according to the disclosure;
fig. 7 is a schematic diagram of an intra-battery short-circuit warning device according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the present application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.
Unless defined otherwise, 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Along with the wide application of lithium ion batteries in the fields of new energy automobiles, energy storage and the like, in order to improve the charging efficiency, more and more people use quick charging to charge the lithium ion batteries. Although the quick charge can significantly shorten the charging time, a certain acceleration effect is caused on the capacity and power decay of the battery, thereby further causing a large amount of lithium precipitation of the battery. When lithium dendrite after lithium separation pierces the diaphragm, short circuit in the battery can be caused, and serious safety accidents are caused. In order to identify a battery with internal short circuit, the applicant judges whether the battery has internal short circuit or not by collecting a voltage signal of the battery in a charging section. However, the applicant found that the method of using the battery voltage to determine whether an internal short circuit has occurred in the battery has a missing detection condition, namely: there are still some cells in which an internal short circuit occurs that cannot be detected.
The applicant finds that, because the battery comprises a plurality of battery cells, different battery cells may have differences due to errors such as processing, and the like, so that the voltage of the battery itself fluctuates within a certain range, misjudgment exists when judging whether the battery has an internal short circuit or not through the voltage of the battery, and in addition, the voltage change caused by the short circuit of the ohmic level of the battery is difficult to be covered by the voltage identification precision of the detection system, and the battery with the internal short circuit cannot be identified.
In view of the problems found by the inventors, the present application provides a method capable of accurately identifying an internal short circuit of a battery, which is capable of determining whether the internal short circuit of the battery occurs or not by obtaining a leakage current of the battery and then determining whether the internal short circuit of the battery occurs according to the leakage current of the battery.
The battery disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The electric equipment can be used for accurately identifying whether the battery is internally short-circuited or not, and the safety risk in the use process of the battery is reduced.
The embodiment of the application provides electric equipment using a battery as a power supply, wherein the battery comprises at least one battery cell. The powered device may be, but is not limited to, a cell phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft, and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.
For convenience of explanation, the following embodiments take an electric device according to an embodiment of the present application as an example of a vehicle.
The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like. The vehicle is provided inside with a battery system 101, the battery system 101 including a battery and battery management system (Battery Management System, BMS) 120, and the battery 110 including a plurality of battery packs connected in parallel. The battery 120 may be disposed at the bottom or the head or the tail of the vehicle. Any one of the battery packs 110 includes at least one battery cell for charging or discharging, and may be repeatedly charged in a recyclable manner. The battery 110 may be used for power supply of the vehicle, for example, as an operating power source of the vehicle.
In some embodiments of the present application, the battery may be used not only as an operating power source for a vehicle, but also as a driving power source for a vehicle, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle.
BMS sets up for intelligent management and maintenance battery, and its aim at prevents that the battery from appearing overcharging and overdischarging, prolongs the life of battery, monitors the state of battery.
Fig. 1 shows a schematic configuration diagram of a battery system 101 to which an embodiment of the present application is applied. Referring to fig. 1, the battery system is used to connect with a charging device 100 at the time of charging and to control a charging current and a charging voltage at which the charging device 100 charges a battery 110. Alternatively, charging device 100 includes, but is not limited to, a charging peg.
The BMS120 and the battery 110 may be connected by a harness including a data collection harness for monitoring the state of the battery. For example, the BMS120 can read the variation of the parameters of the voltage, current, temperature, etc. of the battery during the charge or discharge of the battery. In addition, the BMS120 further includes an internal short-circuit early-warning device 600, and the internal short-circuit early-warning device 600 can determine whether an internal short-circuit occurs in the battery according to the collected data.
It should be noted that the battery 110 may also include more or fewer elements, or have different element configurations, which are not limited in this embodiment. Referring to fig. 2, fig. 2 is a schematic diagram of a battery internal short-circuit early warning method according to an embodiment of the present application.
The method comprises the following steps:
step S201, obtaining a first voltage when the battery is charged to a first preset State of Charge (State of Charge);
step S301, controlling the battery to charge at a constant first voltage;
step S401, obtaining a first current of a battery after being charged for a preset time at a constant first voltage;
step S501: and judging whether the battery is internally short-circuited according to the first current.
When the battery is charged, the user electrically connects the battery 110 with the charging stake. The BMS120 transmits a charging request instruction to the charging stake according to a first preset SOC set by a user. And after receiving a charging request instruction from the BMS, the charging pile charges the battery through a charging strategy preset in the BMS system. When the battery 110 is charged to the first preset SOC, the voltage of the battery 110 reaches the first voltage. When the voltage of the battery 110 reaches the first voltage, if an internal short circuit occurs in the battery 110, a large leakage current is generated due to the internal short circuit, and the battery voltage is greatly reduced. At this time, in order to maintain the voltage of the battery at the first voltage, it is necessary to continue charging the battery at the constant first voltage. In the charging process, the current after the battery 110 is charged for a preset time with a constant first voltage is the first current, and the first current is the leakage current of the battery 110. It is possible to judge whether or not an internal short circuit occurs in the battery based on the leakage current of the battery 110.
When the battery is charged at a constant first voltage, the charging current may be unstable at the initial stage of charging, and it is generally necessary to keep the charging current stable after a certain period of time. Therefore, in consideration of the accuracy of the determination result, it is necessary to select the current after the charging preset time as the first current when the first current is acquired. It will be appreciated that the predetermined time may be determined experimentally or may be selected empirically. However, when determining the preset time, on one hand, whether the current has reached a stable value needs to be considered, and on the other hand, the detection time is too long to avoid the influence on the detection efficiency caused by too long preset time.
Although the voltage of the battery 110 in which the internal short circuit occurs is reduced from that of the normal battery 110, erroneous judgment is caused if the battery 110 is judged whether the internal short circuit occurs by detecting the battery voltage. Because the voltage identification precision of the detection system is difficult to cover the voltage change caused by the short-circuit resistance of the ohmic level of the battery, the battery 110 with internal short circuit cannot be effectively identified. When the first current is the leakage current for internal short circuit to determine whether the internal short circuit occurs in the battery 110, the accuracy of the internal short circuit determination of the battery is greatly improved, the battery 110 with internal short circuit is timely identified, and the safety risk caused by the short circuit is reduced.
Optionally, referring to fig. 3, determining whether an internal short circuit occurs in the battery 110 according to the first current according to some embodiments of the present application includes:
step S502: when the first current is greater than the threshold current,
step S503: judging that the internal short circuit of the battery 110 occurs; or alternatively, the process may be performed,
step S504: when the first current is less than or equal to the threshold current, it is determined that no internal short circuit occurs in the battery 110.
The inside of the normal battery 110 generates a small leakage current due to the chemical reaction, which is smaller than the current at which the internal short circuit of the battery 110 occurs. Therefore, it is possible to determine whether the internal short circuit of the battery 110 occurs according to whether the leakage current generated by the internal short circuit of the battery 110 is greater than the leakage current generated by the chemical reaction normally occurring inside the battery 110. For example, the leakage current of the battery 110, which is generated by the chemical reaction without the internal short circuit, may be measured in advance, and stored in the BMS120 as the threshold current in advance. During the charging, the BMS120 compares the first current with the threshold current after taking the first current. When the first current is greater than the threshold current, judging that the battery 110 is in internal short circuit; alternatively, when the first current is less than or equal to the threshold current, it is determined that the internal short circuit of the battery 110 does not occur. The method for judging whether the battery 110 is internally short-circuited is simplified by judging the internal short-circuited through the threshold current, so that the efficiency of judging the internal short-circuited is improved, and the safety of the battery 110 in the use process is further improved.
In some embodiments, the intra-battery short warning method further comprises: the threshold current is determined according to the relationship between the charging time and the charging current of charging at a constant first voltage after the battery 110 is charged to the first preset state of charge for the first time.
Internal shorting of the battery 110 is typically caused by battery lithium evolution after multiple charge and discharge cycles. Therefore, it can be considered that the battery 110 is not internally shorted at the time of the first charge and discharge. That is, in addition to previously measuring the leakage current of the normal battery 110 and setting it in the BMS120, the threshold current may be determined by acquiring the relationship between the charging current after the battery 110 is charged to the first preset state of charge for the first time and the charging time at the constant first voltage. In determining the threshold current, since the charging current charged at the constant first voltage may fluctuate for a short time, if the current at a certain time in the fluctuating state is used as the leakage current of the normal battery, the judgment result may be inaccurate. Therefore, in order to ensure the accuracy of the threshold current, it is necessary to determine the threshold current with the charging current in a steady state as the threshold current, that is, by a relationship between the charging current and the charging time. For example, the current of the BMS120 after the battery is charged at a constant first voltage for 5 minutes may be set as the threshold current according to the actual setting. It is understood that the charging time may be set according to the model or kind of the battery.
When the leakage current generated when the battery 110 is charged to the first voltage for the first time is used as the leakage current without internal short circuit, the method for obtaining the leakage current can be simplified, and the detection efficiency is improved on the premise of ensuring the detection result.
In some embodiments, determining whether an internal short circuit has occurred in the battery 110 based on the first current includes: judging whether the battery 110 is in an internal short circuit or not according to the relation between the first current and the second current, wherein the second current is a current after the battery 110 is charged to a first preset state of charge for a preset time at a constant first voltage.
When the battery 110 is internally shorted, the lithium is increasingly separated from the battery 110 as the charging frequency of the battery 110 increases, thereby increasing the leakage current of the battery 110. And the leakage current of the normal battery 110 is always the leakage current after the chemical reaction inside the battery 110 along with the increase of the charging times of the normal battery 110. Therefore, it is possible to determine whether the internal short circuit of the battery 110 occurs by comparing the current after charging at a constant first voltage for a preset time, i.e., the leakage current, in the two charging processes.
It is understood that the first current and the second current may be currents obtained during two adjacent charging processes, or currents obtained during two non-adjacent charging processes.
The relationship between the charging current of the battery in the two charging processes is utilized to judge the internal short circuit of the battery, so that the charging process of the battery can be utilized without additional operation; on the other hand, the internal short circuit test time can be flexibly selected, so that the detection process is flexible and can be realized.
Referring to fig. 4, according to some embodiments of the present application, determining whether a short circuit occurs in the battery 110 according to a relationship between the first current and the second current includes:
step S512: when the difference between the first current and the second current is greater than the preset threshold,
step S513: judging that the battery has internal short circuit; or alternatively, the process may be performed,
step S514: when the difference between the first current and the second current is less than or equal to the preset threshold, it is determined that the internal short circuit of the battery 110 does not occur.
When the battery 110 is not internally shorted, the leakage current of the battery 110 should be only the current generated by the chemical reaction inside the battery 110, i.e. the leakage current should be substantially unchanged during different charging processes, but if the battery 110 is internally shorted, the leakage current of the battery 110 after the last charging will be greater than the leakage current after the previous charging. The first current and the second current are respectively leakage currents in the two charging processes, so that whether the battery has internal short circuit or not can be judged by judging the difference value of the first current and the second current. When the first current and the second current are substantially unchanged, i.e., the difference between the first current and the second current is less than a preset threshold, no internal short circuit occurs in the battery 110; when the difference between the first current and the second current exceeds the preset threshold, it may be determined that an internal short circuit of the battery 110 occurs.
Fig. 5 is a schematic diagram of the current after the battery is charged for a preset time at the first voltage, wherein the current when the battery 110 is charged for the preset time at the first voltage for the first time is the first current; the current when the battery 110 is charged at the first voltage for the second time for the preset time is the second current. Referring to fig. 5 (a), the battery is charged for a preset time T when the first current and the second current are substantially the same in magnitude, and an internal short circuit does not occur. With continued reference to fig. 5 (b), in this case, the second current is greater than the first current at the time of charging for the preset time T, an internal short circuit of the battery occurs.
In some embodiments, the preset threshold is less than or equal to 1mA.
The setting of the preset threshold directly affects the accuracy of the short circuit detection within the battery 110. The battery 110 with the internal short circuit can not be detected due to the fact that the preset threshold is too large, and the battery with the internal short circuit can be accurately identified when the preset threshold is smaller than or equal to 1mA, so that the safety performance of the battery 110 in the use process is improved.
Referring to fig. 6, the method for early warning of short circuit in a battery further includes:
s601: it is determined that an internal short circuit of the battery 110 occurs,
s701: the charging of the battery 110 is stopped and an alarm is issued.
After the internal short circuit occurs in the battery 110, a large amount of heat is released, which causes the battery 110 to overheat, and serious safety accidents such as explosion and the like are caused. Therefore, after the internal short circuit is determined, the battery 110 should be stopped being charged in time and an alarm is sent out, so that a user is prompted to react according to the alarm, and the probability of safety accidents is reduced.
Referring to fig. 7, fig. 7 is a schematic diagram of an intra-battery short-circuit warning device according to an embodiment of the present application. The battery internal short-circuit early-warning device can execute the battery internal short-circuit early-warning method of each embodiment. Accordingly, the foregoing embodiments may be referred to for a part of the following embodiments that is not described in detail. The battery internal short circuit early warning device comprises: an acquisition module 601; a control module 602 and a determination module 603.
The acquiring module 601 is configured to acquire a first voltage when the battery is charged to a first preset state of charge. The control module 602 is configured to control the battery to charge at a constant first voltage; the acquisition module 601 is further configured to acquire a first current after the battery is charged for a preset time at a constant first voltage. A determining module 603 is configured to determine whether an internal short circuit occurs in the battery according to the first current.
On judging whether the battery 110 has the problem of internal short circuit, in order to avoid the problem that the identification accuracy of the detection system to the voltage is low, the application determines whether the battery 110 has the internal short circuit by detecting the leakage current of the battery, but the leakage current of the battery 110 is difficult to directly detect, so the embodiment of the application simplifies the problem of difficulty in acquiring the internal short circuit leakage current of the battery into the simple problem of acquiring the first current of the battery 110 after the battery 110 is charged for a preset time under a constant first voltage by arranging the control module and the acquisition module, and determines whether the battery 110 has the internal short circuit according to the acquired first current. In this way, on the one hand, the accuracy of detecting the internal short circuit is improved, and on the other hand, the internal short circuit judging process of the battery 110 is simplified, and the detection efficiency is improved.
In some embodiments, the determining module 603 is configured to determine that the internal short circuit occurs in the battery 110 when the first current is greater than the threshold current; or, when the first current is less than or equal to the threshold current, it is determined that the internal short circuit of the battery 110 does not occur.
The determining module 603 compares the first current with a threshold current to determine whether an internal short circuit of the battery 110 occurs according to the first current. The threshold current may be a leakage current of the normal battery 110. Therefore, accurate judgment can be realized without setting an additional mechanism, and judgment logic is simple.
In some embodiments, the determining module 603 is further configured to determine the threshold current according to a relationship between a charging time and a charging current of charging the battery 110 at a constant first voltage after the battery is charged to the first preset state of charge for the first time.
The threshold current is obtained in various ways, and when the charging current of the battery 110 in the first constant voltage charging process is used as the threshold current by the determining module 603, all data of the internal short circuit judgment can be obtained in the battery use process, so that the method is simple, quick and high in efficiency.
In some embodiments, the determining module 603 is further configured to determine whether an internal short circuit occurs in the battery 110 according to a relationship between a first current and a second current, where the second current is a current after the battery 110 is charged to a first state of charge for a preset time at a constant first voltage.
In addition to determining whether or not an internal short circuit has occurred in the battery based on the threshold current, the battery 110 may be determined by comparing the current after a preset time of constant voltage charging twice before and after. The method integrates the judgment of the internal short circuit of the battery 110 and the charging process of the battery 110, improves the internal short circuit detection frequency, further discovers the internal short circuit of the battery 110 in time, and ensures the safety of the battery 110 in the use process.
In some embodiments, the determining module 603 is further configured to determine that an internal short circuit occurs in the battery 110 when the difference between the first current and the second current is greater than a preset threshold; or, when the difference between the first current and the second current is less than or equal to the preset threshold, it is determined that the internal short circuit of the battery 110 does not occur.
Embodiments of the present application also provide a computer-readable storage medium. The computer readable storage medium may be a non-volatile computer readable storage medium. The computer readable storage medium stores a computer program.
Wherein the computer program, when executed by the processor, implements one or more of the method steps in the intra-battery short warning method in the above embodiments. The complete computer program product is embodied on one or more computer readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing a computer program as disclosed in embodiments of the present application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (13)

1. An intra-battery short-circuit warning method is characterized by comprising the following steps:
acquiring a first voltage of a battery charged to a first preset charge state;
controlling the battery to charge at a constant first voltage;
acquiring a first current of the battery after the battery is charged for a preset time at a constant first voltage;
judging whether the battery is in internal short circuit or not according to the first current.
2. The method of claim 1, wherein determining whether an internal short circuit has occurred in the battery according to the first current comprises:
when the first current is larger than a threshold current, judging that the battery is in internal short circuit; or alternatively, the process may be performed,
and when the first current is smaller than or equal to a threshold current, judging that the battery is not internally short-circuited.
3. The intra-battery short warning method according to claim 2, characterized in that the method further comprises:
and determining a threshold current according to the relationship between the charging time and the charging current of the battery charged at the constant first voltage after the battery is charged to the first charge preset state for the first time.
4. The method of claim 1, wherein determining whether an internal short circuit has occurred in the battery according to the first current comprises:
judging whether the battery is in an internal short circuit or not according to the relation between the first current and the second current, wherein the second current is the current after the battery is charged to the first charge preset state for the last time and the preset time is charged by the constant first voltage.
5. The method of claim 4, wherein determining whether a short circuit has occurred in the battery according to the relationship between the first current and the second current comprises:
when the difference value between the first current and the second current is larger than a preset threshold value, judging that the battery is in internal short circuit; or alternatively, the process may be performed,
and when the difference value between the first current and the second current is smaller than or equal to a preset threshold value, judging that the internal short circuit of the battery does not occur.
6. The method of claim 5, wherein the predetermined threshold is less than or equal to 1mA.
7. The method for early warning of an internal short circuit in a battery according to any one of claims 1 to 6, further comprising: and stopping charging the battery and sending out an alarm when the internal short circuit of the battery is determined.
8. An intra-battery short-circuit warning device, comprising:
the acquisition module is used for acquiring a first voltage of the battery charged to a first preset charge state;
a control module for controlling the battery to charge at a constant first voltage;
the acquisition module is also used for acquiring a first current of the battery after the battery is charged for a preset time at the constant first voltage;
and the determining module is used for judging whether the battery is internally short-circuited according to the first current.
9. The device for early warning of an internal short circuit in a battery according to claim 8, characterized in that,
the determining module is configured to determine, based on the received data,
when the first current is larger than a threshold current, judging that the battery is in internal short circuit;
or alternatively, the process may be performed,
and when the first current is smaller than or equal to the threshold current, judging that the battery is not internally short-circuited.
10. The intra-battery short warning device according to claim 9, wherein the determining module is further configured to determine the threshold current according to a relationship between a charging time and a charging current for charging the battery at a constant first voltage after the battery is charged to the first preset state of charge for the first time.
11. A battery management system comprising the intra-battery short-circuit warning device according to any one of claims 8 to 10.
12. An electrical device comprising the battery management system of claim 12.
13. A computer-readable storage medium, wherein the computer storage medium stores computer program instructions; the computer program instructions, when invoked by a processor, cause the processor to perform the intra-battery short warning method of any one of claims 1-7.
CN202210006662.4A 2022-01-05 2022-01-05 Method, device and system for early warning of short circuit in battery, power utilization device and storage medium Pending CN116413625A (en)

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CN202210006662.4A CN116413625A (en) 2022-01-05 2022-01-05 Method, device and system for early warning of short circuit in battery, power utilization device and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210006662.4A CN116413625A (en) 2022-01-05 2022-01-05 Method, device and system for early warning of short circuit in battery, power utilization device and storage medium

Publications (1)

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CN116413625A true CN116413625A (en) 2023-07-11

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