CN112666477B - Method for determining short circuit in battery, electronic device, and storage medium - Google Patents
Method for determining short circuit in battery, electronic device, and storage medium Download PDFInfo
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- CN112666477B CN112666477B CN201910977902.3A CN201910977902A CN112666477B CN 112666477 B CN112666477 B CN 112666477B CN 201910977902 A CN201910977902 A CN 201910977902A CN 112666477 B CN112666477 B CN 112666477B
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Abstract
A method for judging short circuit in a battery comprises the following steps: acquiring a first threshold and a second threshold; at a constant current ICCollecting the voltage V1 of the battery during the charging of the battery; collecting the voltage V2 of the battery at the T moment after collecting the voltage V1 of the battery; determining that the battery has an internal short circuit when a difference between voltage V2 and voltage V1 is between the first threshold and the second threshold. The application also provides an electronic device and a storage medium, which can detect the internal short circuit of the battery.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method for determining a short circuit in a battery, an electronic device, and a storage medium.
Background
At present, the defects of the battery in the production process, the aging of the battery along with the time lapse in the use process, improper use, external force action and other reasons can cause short circuit in the battery, and further can cause the battery to burn or even explode, thereby bringing damage to the life and property of users. Currently, a detection method capable of effectively determining a short circuit in a battery has not been available.
Disclosure of Invention
In view of the above, it is desirable to provide a method for determining an internal short circuit of a battery, an electronic device and a storage medium, which can detect the internal short circuit of the battery.
An embodiment of the present application provides a method for determining a short circuit in a battery, where the method for determining a short circuit in a battery includes:
acquiring a first threshold and a second threshold;
at a constant rateCurrent ICCollecting the voltage V1 of the battery during the charging of the battery;
collecting the voltage V2 of the battery at the T moment after collecting the voltage V1 of the battery;
determining that the battery has an internal short circuit when a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold.
According to some embodiments of the application, at constant current ICBefore collecting the voltage V1 of the battery during charging the battery, the method for determining short circuit in the battery further includes:
determining that the state of charge of the battery is greater than or equal to 90%.
According to some embodiments of the application, the current is at a constant current ICThe charging period of the battery comprises:
at a constant current ICThe battery is charged for a preset time.
According to some embodiments of the present application, before collecting the voltage V2 of the battery after collecting the voltage V1 and at time T, the method for determining the short circuit in the battery further includes:
according to the change value of the state of charge of the battery, the actual capacity of the battery at the current moment and the constant current ICAnd determining the T.
According to some embodiments of the present application, the change value of the state of charge of the battery, the actual capacity of the battery at the current moment and the constant current ICDetermining the T comprises:
according to the formula
Determining the T, wherein T1For said T, Δ SOC is the state of charge change value, Q, of the batterytotalActual capacity of the battery at the present time, and ICIs a constant current.
According to some embodiments of the present application, before collecting the voltage V2 of the battery after collecting the voltage V1 and at time T, the method for determining the short circuit in the battery further includes:
the actual capacity of the battery at the current moment is detected.
According to some embodiments of the present application, before the obtaining the first threshold and the second threshold, the method for determining an internal short circuit of a battery further includes:
and determining the first threshold and the second threshold according to the state of charge change value of the battery and a first relation table.
According to some embodiments of the present application, the first relation table is a relation table between a state of charge change value of the battery and the first threshold and the second threshold.
According to some embodiments of the present application, the state of charge change value of the battery is a pre-stored state of charge change value.
According to some embodiments of the present application, the method for determining an internal short circuit of a battery further includes:
and determining the state of charge change value of the battery according to a second relation table.
According to some embodiments of the present application, the second relationship table is a state of charge variation range table of the battery.
According to some embodiments of the present application, the method for determining an internal short circuit of a battery further includes:
determination of the internal short-circuit current ISIs equal to the constant current IC。
According to some embodiments of the present application, the method for determining an internal short circuit of a battery further includes:
increasing a constant current I when the difference between the voltage V2 and the voltage V1 is less than the first threshold valueCAnd collecting a voltage V1, collecting a voltage V2, and comparing the voltage V2 with the voltage V1 until a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold or the battery switches into constant voltage charging.
According to some embodiments of the present application, the method for determining short circuit in a battery further includes:
when the constant current ICAnd increasing the voltage until the battery is switched into constant voltage charging, and determining that the battery has no internal short circuit.
According to some embodiments of the application, the increasing the constant current ICThe method comprises the following steps:
increasing the constant current ICIs 2IC。
According to some embodiments of the present application, the method for determining an internal short circuit of a battery further includes:
when the difference between the voltage V2 and the voltage V1 is less than the first threshold, the constant current I passes through the difference between the voltage V2 and the voltage V1CAnd a third relation table for determining the internal short-circuit current IS；
Judging the internal short-circuit current ISWhether the current value is greater than a preset value;
when the internal short-circuit current ISAnd if the current is larger than the preset value, determining that the battery has an internal short circuit.
According to some embodiments of the present application, the third relationship table is a correspondence table between a state of charge change of the battery and a voltage difference.
According to some embodiments of the present application, the constant current I is passed through a difference between the voltage V2 and the voltage V1CAnd a third relation table for determining the internal short-circuit current ISThe method comprises the following steps:
determining a voltage difference according to the third relation table;
according to the formula
Determining the internal short-circuit current ISWherein, ISFor the internal short-circuit current, ICFor the constant current, V2-V1 is the difference between the voltage V2 and the voltage V1, and VtargetIs the voltage difference.
According to some embodiments of the present application, the method for determining an internal short circuit of a battery further includes:
when the internal short-circuit current ISAnd if the internal short circuit is smaller than or equal to a preset value, determining that the battery has no internal short circuit.
According to some embodiments of the present application, the method for determining an internal short circuit of a battery further includes:
when the voltage V2 and the voltage V1 are appliedThe difference is greater than the second threshold value, and the constant current I is reducedCAnd collecting a voltage V1, collecting a voltage V2, and comparing the voltage V2 with the voltage V1 until a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold or the constant current ICTo less than or equal to the minimum charging current of the charging device.
According to some embodiments of the present application, the method for determining an internal short circuit of a battery further includes:
when the constant current ICDecreasing to less than or equal to a minimum charging current of a charging device, determining that there is no internal short circuit in the battery.
According to some embodiments of the application, the decreasing constant current ICThe method comprises the following steps:
reducing the constant current ICIs IC/2。
According to some embodiments of the application, at constant current ICBefore collecting the voltage V1 of the battery during charging the battery, the method for determining short circuit in the battery further includes:
controlling the battery to a constant current ICCharging the battery.
An embodiment of the present application provides an electronic device, including:
a battery;
a processor; and
a memory, in which a plurality of program modules are stored, the program modules being loaded by the processor and executing the method for determining an internal short circuit of a battery to detect the internal short circuit of the battery.
An embodiment of the present application provides a storage medium, on which at least one computer instruction is stored, where the instruction is loaded by a processor to execute the method for determining an internal battery short circuit according to any one of the above items.
According to the method for judging the short circuit in the battery, the electronic device and the storage medium, the first threshold value and the second threshold value are obtained; at a constant current ICCollecting a battery during charging of said batteryVoltage V1; collecting the voltage V2 of the battery at the T moment after collecting the voltage V1 of the battery; determining that the battery has an internal short circuit when a difference between voltage V2 and voltage V1 is between the first threshold and the second threshold. Thus, the method for determining an internal short circuit of a battery, the electronic device and the storage medium provided by the embodiment of the application can detect the internal short circuit of the battery.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Fig. 2 is a flowchart of a method for determining a short circuit in a battery according to an embodiment of the present disclosure.
Fig. 3 is a flowchart of detecting whether there is an internal short circuit of the battery when the difference between the voltage V2 and the voltage V1 is smaller than the first threshold according to the first embodiment of the present application.
Fig. 4 is a flowchart of detecting whether there is an internal short circuit of the battery when the difference between the voltage V2 and the voltage V1 is smaller than the first threshold according to the second embodiment of the present application.
Fig. 5 is a flowchart illustrating the process of detecting whether there is an internal short circuit in the battery when the difference between the voltage V2 and the voltage V1 is greater than the second threshold value according to an embodiment of the disclosure.
Fig. 6 is a block diagram of an apparatus for determining short circuit in a battery according to an embodiment of the present application.
Description of the main elements
Internal short determination module 630
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are intended to be within the scope of the present disclosure.
Referring to fig. 1, the device 10 for determining short circuit in battery operates in an electronic device 100. The electronic device 100 includes, but is not limited to, a memory 11, at least one processor 12, a battery 13, and an acquisition device 14, and the above elements may be connected via a bus or directly. The memory 11 stores the device 10 for determining an internal short circuit of the battery.
It should be noted that fig. 1 is only an example of the electronic device 100. In other embodiments, electronic device 100 may include more or fewer elements, or have a different configuration of elements. The electronic device 100 may be an electric motorcycle, an electric bicycle, an electric automobile, a mobile phone, a tablet computer, a digital assistant, a personal computer, or any other suitable rechargeable device.
In one embodiment, the battery 13 is a rechargeable battery for providing power to the electronic device 100. For example, the battery 13 may be a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium ion battery, a lithium polymer battery, a lithium iron phosphate battery, or the like. The battery 13 is logically connected to the processor 12 through a Battery Management System (BMS), so that functions such as charging and discharging are performed through the battery management system. The battery management system CAN be in communication connection with an energy storage inverter (PCS) through CAN or RS 485. The battery 13 includes a cell (not shown).
The collecting device 14 is used for collecting the voltage of the battery. In this embodiment, the collecting device 14 is configured to collect the cell voltage of the battery 13. In this embodiment, the acquisition device 14 is an analog-to-digital converter. It is understood that the voltage acquisition device 14 may also be other voltage acquisition devices. The electronic device 100 may also include other devices such as pressure sensors, light sensors, gyroscopes, hygrometers, infrared sensors, and the like.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for determining a short circuit in a battery according to an embodiment of the present disclosure. The method for determining an internal short circuit of a battery may include the steps of:
in step S21, a first threshold and a second threshold are obtained.
In this embodiment, the obtaining of the first threshold and the second threshold may be obtaining a pre-stored first threshold and a pre-stored second threshold. The electronic device is pre-stored with a first threshold and a second threshold.
In this embodiment, the acquiring the first threshold and the second threshold may be acquiring a calculated first threshold and a calculated second threshold. In this embodiment, before obtaining the first threshold and the second threshold, the method further includes:
and determining the first threshold and the second threshold according to the state of charge change value of the battery and a first relation table.
In this embodiment, the first relation table is a corresponding relation table between the state of charge change value of the battery and the first threshold and the second threshold.
In this embodiment, before obtaining the first threshold and the second threshold, the method further includes: and acquiring a state of charge change value of the battery. The state of charge change value of the battery may be a pre-stored state of charge change value, such as 1%, 2%, 3%, etc. The state of charge change value of the battery may also be a value in a state of charge change range of the battery. In this embodiment, the method further includes: and determining the state of charge change value of the battery according to a second relation table. The second relation table is a state of charge variation range table of the battery. Specifically, determining the state of charge change value of the battery according to the second relation table includes:
randomly selecting a state of charge change value of the battery from the state of charge change range of the battery;
and determining the selected state of charge change value of the battery as the state of charge change value of the battery.
The determining the first threshold and the second threshold according to the state of charge change value of the battery and a first relation table includes:
inquiring the state of charge change value of the battery matched with the state of charge change value of the battery in a corresponding relation table of the state of charge change value of the battery and a first threshold value and a second threshold value;
and determining a first threshold and a second threshold corresponding to the inquired state of charge change value of the battery in a corresponding relation table of the state of charge change value of the battery and the first threshold and the second threshold as the first threshold and the second threshold.
Step S22, at constant current ICDuring charging of the battery, the voltage V1 of the battery is collected.
In the present embodiment, in order not to affect the charging effect of the battery, the constant current I is usedCDuring the charging of the battery, before collecting the voltage V1 of the battery, the method further comprises: determining that the state of charge of the battery is greater than or equal to 90%.
In the present embodiment, the constant current I is usedCDuring the charging of the battery, before collecting the voltage V1 of the battery, the method further comprises: controlling the battery to a constant current ICCharging the battery. Preferably, the constant current ICIs 100 mA. The constant current ICOther values are possible, as may be desired.
In the present embodiment, the constant current I is usedCThe charging period of the battery comprises: at a constant current ICThe battery is charged for a preset time. Preferably, the preset time period is 2 to 8 minutes. The preset time length can also be other values and can be determined according to specific requirements.
And step S23, collecting the voltage V2 of the battery at the T moment after collecting the voltage V1 of the battery.
In this embodiment, before collecting the voltage V2 of the battery at the time T after collecting the voltage V1 of the battery, the method further includes:
according to the change value of the state of charge of the battery, the actual capacity of the battery at the current moment and the constant current ICAnd determining the T.
In this embodiment, when the voltage V2 of the battery is collected after T time T of collecting the voltage V1 of the battery, the method further includes: the actual capacity of the battery at the current moment is detected. The actual battery capacity at the current time may be the actual battery capacity at the current time calculated by other systems in the electronic device, may also be the actual battery capacity at the current time calculated by other devices outside the electronic device, or may also be the actual battery capacity at the current time calculated by the method using any known method. The actual capacity of the battery at the current moment is updated along with the use of the battery. And when the battery is used for the first time, the actual capacity of the battery at the current moment is the preset capacity. The preset capacity is pre-stored in the electronic device.
In this embodiment, the value of the change in the state of charge of the battery, the actual capacity of the battery at the present time, and the constant current ICDetermining the T comprises:
according to the formula
Determining the T, wherein T1For said T, Δ SOC is the state of charge change value, Q, of the batterytotalIs the actual capacity of the battery at the present moment, and ICIs a constant current.
Step S24, determining that the battery has an internal short circuit when the difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold.
In this embodiment, the method further includes: determining whether a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold.
In this embodiment, the determining whether the difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold comprises:
a1, determining the difference between the voltage V2 and the voltage V1;
a2, comparing the difference between the voltage V2 and the voltage V1 with the first threshold value and the difference between the voltage V2 and the voltage V1 with the second threshold value;
a3, when the difference between the voltage V2 and the voltage V1 is greater than the first threshold value and less than the second threshold value, determining that the difference between the voltage V2 and the voltage V1 is between the first threshold value and the second threshold value;
a4, when the difference between the voltage V2 and the voltage V1 is less than the first threshold value and less than the second threshold value, determining that the difference between the voltage V2 and the voltage V1 is less than the first threshold value;
a5, when the difference between the voltage V2 and the voltage V1 is greater than the first threshold and greater than the second threshold, determining that the difference between the voltage V2 and the voltage V1 is greater than the second threshold.
In this embodiment, the method further includes: determination of the internal short-circuit current ISIs equal to the constant current IC. Therefore, the method for judging the internal short circuit of the battery not only can detect the internal short circuit of the battery, but also can determine the internal short circuit current I of the batteryS。
In this embodiment, as shown in fig. 3, in order to detect the internal short circuit of the battery when the difference between the voltage V2 and the voltage V1 is less than the first threshold, the method may further include:
step S31, when the difference between the voltage V2 and the voltage V1 is less than the first threshold, increasing the constant current ICAnd collecting a voltage V1, collecting a voltage V2, and comparing the voltage V2 with the voltage V1 until a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold or the battery switches into constant voltage charging;
step S32, when the constant current I is appliedCAnd increasing the voltage until the battery is switched into constant voltage charging, and determining that the battery has no internal short circuit.
In the present embodiment, the increasing constant current ICThe method comprises the following steps:
increasing the constant current ICIs 2IC。
In this embodiment, when the constant current I is appliedCWhen the current is increased to a preset current, the battery is switched to constant voltage charging. Preferably, the preset current is 300 mA. The preset current may also have other values, which may be determined according to specific situations.
In the present embodiment, the increasing constant current ICAnd collecting a voltage V1, collecting a voltage V2, and comparing the voltage V2 to the voltage V1 until the difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold or the battery switches into constant voltage charging may be, for example:
increasing the constant current ICAt a constant current I of 200mACCollecting a voltage V1 during the charging period of the battery, collecting a voltage V2 at the T moment after collecting the voltage V1, and continuously increasing the constant current I when the difference between the voltage V2 and the voltage V1 is less than the first threshold valueCAt 400mA, the battery switches into constant voltage charging.
In this embodiment, the method further includes: if the battery is determined to have internal short circuit, determining internal short circuit current ISEqual to the constant current I increased upon determination of the presence of a short circuit in the batteryC. For example, if the constant current ICDetecting the existence of internal short circuit of the battery at 200mA, and determining the internal short circuit current ISEqual to 200 mA. Therefore, the method for judging the internal short circuit of the battery can not only detect the internal short circuit of the battery, but also determine the internal short circuit current I of the batteryS。
In this embodiment, as shown in fig. 4, in order to detect the internal short circuit of the battery when the difference between the voltage V2 and the voltage V1 is less than the first threshold, the method may further include:
step S41, when the difference between the voltage V2 and the voltage V1 is smaller than the first threshold, a constant current I is obtained by the difference between the voltage V2 and the voltage V1CAnd a third relation table for determining the internal short-circuit current IS。
Step S42, judging the internal short-circuit current ISWhether the current value is greater than a preset value.
Step S43, when the internal short-circuit current ISAnd if the current is larger than the preset value, determining that the battery has an internal short circuit.
Step S44, when the internal short-circuit current ISAnd if the internal short circuit is smaller than or equal to a preset value, determining that the battery has no internal short circuit.
In this embodiment, the third relation table is a corresponding relation table of the state of charge change and the voltage difference of the battery. The constant current I passing through the difference between the voltage V2 and the voltage V1CAnd a third relation table for determining the internal short-circuit current ISThe method comprises the following steps:
determining a voltage difference according to the third relation table;
according to the formula
Determining the internal short-circuit current ISWherein, ISFor said internal short-circuit current, ICFor the constant current, V2-V1 is the difference between the voltage V2 and the voltage V1, and VtargetIs the voltage difference.
In this embodiment, the determining the voltage difference according to the third relation table includes:
b1, determining the state of charge change of the battery;
b2, inquiring the state of charge change of the battery matched with the determined state of charge change of the battery in the corresponding relation table of the state of charge change of the battery and the voltage difference;
b3, determining the voltage difference corresponding to the inquired charge state change of the battery in the charge state change and voltage difference corresponding relation table as the voltage difference.
In the present embodiment, the state of charge of the battery may be changed, for example, from 7% to 8%, from 96% to 97%, or from 97% to 99%.
In this embodiment, the table of correspondence relationship between the state of charge change of the battery and the voltage difference may be, for example, 15mV for a change in the state of charge of the battery from 7% to 8%, and 12mV for a change in the state of charge of the battery from 96% to 97%.
In this embodiment, the determining the change in the state of charge of the battery includes:
c1, detecting and collecting the first charge state of the battery when the voltage V1 is collected;
c2, detecting and collecting a second charge state of the battery when the voltage V2 is collected;
c3, determining the state of charge change of the battery according to the first state of charge and the second state of charge.
In this embodiment, the first state of charge of the battery when the voltage V1 is collected and the second state of charge of the battery when the voltage V2 is collected may be calculated by other systems in the electronic device, may be calculated by other devices outside the electronic device, or may be calculated by any known method according to the present method, and the first state of charge of the battery when the voltage V1 is collected and the second state of charge of the battery when the voltage V2 is collected.
In this embodiment, determining the change in the state of charge of the battery according to the first state of charge and the second state of charge includes:
determining that the state of charge of the battery changes from the first state of charge to the second state of charge.
In this embodiment, the determination of the internal short-circuit current ISWhether the value is larger than the preset value or not comprises the following steps: comparing the internal short-circuit current ISJudging the internal short-circuit current I according to the magnitude of a preset valueSWhether the current value is greater than a preset value.
In this embodiment, as shown in fig. 5, in order to detect the internal short circuit of the battery when the difference between the voltage V2 and the voltage V1 is greater than the second threshold, the method may further include:
step S51, when the difference between the voltage V2 and the voltage V1 is larger than the second threshold, reducing the constant current ICAnd collecting a voltage V1, collecting a voltage V2, and comparing a voltage V2 to a voltage V1 until a difference between the voltage V2 and the voltage V1 is at the first threshold and the second thresholdBetween the second threshold or the constant current ICReducing to less than or equal to a minimum charging current of the charging device;
step S52, when the constant current I is appliedCDecreasing to less than or equal to a minimum charging current of a charging device, determining that there is no internal short circuit in the battery.
In the present embodiment, the decreasing constant current ICThe method comprises the following steps:
reducing the constant current ICIs IC/2。
In this embodiment, the method further includes: and acquiring the minimum charging current of the charging equipment. The obtaining of the minimum charging current of the charging device may be obtaining the minimum charging current of the charging device from the charging device, and may also be obtaining a calculated minimum charging current of the charging device. The calculated minimum charging current of the charging device may be calculated for other apparatuses of the electronic apparatus, or may be calculated for the apparatuses by any known method.
In the present embodiment, the decreasing constant current ICAnd collecting a voltage V1, collecting a voltage V2, and comparing a voltage V2 with a voltage V1 until a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold or the constant current ICThe minimum charging current reduced to less than or equal to the charging device may be, for example:
reducing the constant current ICAt a constant current I of 50mACCollecting a voltage V1 during the charging period of the battery, collecting a voltage V2 at the T moment after collecting the voltage V1, and continuously reducing the constant current I when the difference between the voltage V2 and the voltage V1 is greater than the second threshold valueCAt a constant current I of 25mACCollecting a voltage V1 during the charging of the battery, collecting a voltage V2 at a time T after collecting a voltage V1, and determining that the battery has an internal short circuit when the difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold.
In this embodiment, the method further includes: determining internal short circuit power if it is determined that the battery has internal short circuitStream ISEqual to the constant current I decreased upon determination of the presence of a short circuit in the batteryC. For example, if the constant current ICDetecting the existence of internal short circuit of the battery at 25mA, and determining the internal short circuit current ISEqual to 25 mA. Therefore, the method for judging the internal short circuit of the battery can not only detect the internal short circuit of the battery, but also determine the internal short circuit current I of the batteryS。
Referring to fig. 6, in an embodiment, in the present embodiment, the device 10 for determining an internal short circuit of a battery may be divided into one or more modules, and the one or more modules are stored in the memory and executed by at least one processor (in this embodiment, a processor), so as to complete the present application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used for describing the execution process of the battery short circuit determination device 10 in the electronic device. For example, the device 10 for determining an internal short circuit in a battery may be divided into an acquisition module 610, an acquisition module 620, and an internal short circuit determination module 630 in fig. 6.
The obtaining module 610 is configured to obtain a first threshold and a second threshold.
The acquisition module 620 is configured to operate at a constant current ICDuring charging of the battery, the voltage V1 of the battery is collected.
The collecting module 620 is further configured to collect the voltage V2 of the battery at a time T after collecting the voltage V1 of the battery.
The internal short determination module 630 is to determine that the battery has an internal short when a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold.
The device for judging the short circuit in the battery of the embodiment can detect the internal short circuit of the battery. For details, reference may be made to the above-mentioned embodiments of the method for determining an intra-cell short circuit, and details are not described herein.
In this embodiment, the memory may be an internal memory of the electronic device, that is, a memory built in the electronic device. In other embodiments, the memory may also be an external memory of the electronic device, i.e., a memory externally connected to the electronic device.
In some embodiments, the memory is used for storing program codes and various data, for example, storing the program codes of the short circuit judgment device 10 in the battery installed in the electronic device, and realizing high-speed and automatic access of programs or data during the operation of the electronic device.
The memory may include random access memory and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other non-volatile solid state storage device.
In one embodiment, the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any other conventional processor or the like.
The modules in the battery internal short circuit determination apparatus 10 may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as independent products. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the methods described above can be realized. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), or the like.
It is understood that the above described module division is a logical function division, and there may be other division ways in actual implementation. In addition, functional modules in the embodiments of the present application may be integrated into the same processing unit, or each module may exist alone physically, or two or more modules are integrated into the same unit. The integrated module can be realized in a hardware form, and can also be realized in a form of hardware and a software functional module.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (23)
1. A method for determining a short circuit in a battery, the method comprising:
acquiring a first threshold and a second threshold;
at a constant current ICCollecting the voltage V1 of the battery during the charging of the battery;
collecting the voltage V2 of the battery at the T moment after collecting the voltage V1 of the battery;
determining that the battery has an internal short circuit when a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold;
the method for judging the short circuit in the battery further comprises the following steps that at the T moment after the voltage V1 of the battery is collected and before the voltage V2 of the battery is collected:
according to the change value of the state of charge of the battery, the actual capacity of the battery at the current moment and the constant current ICAnd determining the T.
2. The method for determining short circuit in battery according to claim 1, wherein the constant current I is appliedCDuring the charging of the battery, before collecting the voltage V1 of the battery, the method for determining the short circuit in the battery further comprises:
determining that the state of charge of the battery is greater than or equal to 90%.
3. The method for determining short circuit in battery according to claim 1, wherein the constant current is ICThe charging period of the battery comprises:
at a constant current ICThe battery is charged for a preset time.
4. The method according to claim 1, wherein the method is based on a change in state of charge of the battery, an actual capacity of the battery at a current time, and the constant current ICDetermining the T comprises:
according to the formula
Determining the T, wherein T1For said T, Δ SOC is the state of charge change value, Q, of the batterytotalIs the actual capacity of the battery at the present moment, and ICIs a constant current.
5. The method for determining an intra-cell short circuit according to claim 1, wherein the method for determining an intra-cell short circuit further comprises, after the time T after the voltage V1 of the battery is collected and before the voltage V2 of the battery is collected:
and detecting the actual capacity of the battery at the current moment.
6. The method of determining an internal short circuit of a battery according to claim 1, wherein before the obtaining the first threshold and the second threshold, the method further comprises:
and determining the first threshold value and the second threshold value according to the state of charge change value of the battery and a first relation table.
7. The method for determining an in-cell short circuit according to claim 6, characterized in that: the first relation table is a corresponding relation table of the state of charge change value of the battery and the first threshold value and the second threshold value.
8. The method according to claim 1, wherein the change in state of charge of the battery is a pre-stored change in state of charge.
9. The method for determining an internal short circuit of a battery according to claim 1, further comprising:
and determining the state of charge change value of the battery according to a second relation table.
10. The method for determining an in-cell short circuit according to claim 9, characterized in that: the second relation table is a state of charge variation range table of the battery.
11. The method of determining an in-cell short circuit according to claim 1, further comprising:
determination of the internal short-circuit current ISIs equal to the constant current IC。
12. The method of determining an in-cell short circuit according to claim 1, further comprising:
increasing a constant current I when the difference between the voltage V2 and the voltage V1 is less than the first threshold valueCCollecting voltage V1, collecting voltage V2, and comparing voltage V2 with the voltageThe voltage V1 is compared until the difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold or the battery switches into constant voltage charging.
13. The method for determining an in-cell short circuit according to claim 12, further comprising:
when the constant current ICAnd increasing the voltage until the battery is switched into constant voltage charging, and determining that the battery has no internal short circuit.
14. The method for determining short circuit in battery according to claim 12, wherein the increasing constant current ICThe method comprises the following steps:
increasing the constant current ICIs 2IC。
15. The method of determining an in-cell short circuit according to claim 1, further comprising:
when the difference between the voltage V2 and the voltage V1 is less than the first threshold, the constant current I passes through the difference between the voltage V2 and the voltage V1CAnd a third relation table for determining the internal short-circuit current IS；
Judging the internal short-circuit current ISWhether the current value is greater than a preset value;
when the internal short-circuit current ISAnd if the current is larger than the preset value, determining that the battery has an internal short circuit.
16. The method for determining an in-cell short circuit according to claim 15, characterized in that: the third relation table is a corresponding relation table of the state of charge change and the voltage difference of the battery.
17. The method of claim 15, wherein the constant current I is determined by a difference between the voltage V2 and the voltage V1CAnd a third relation table for determining the internal short-circuit current ISThe method comprises the following steps:
determining a voltage difference according to the third relation table;
according to the formula
Determining the internal short-circuit current ISWherein, ISFor the internal short-circuit current, ICFor the constant current, V2-V1 is the difference between the voltage V2 and the voltage V1, and VtargetIs the voltage difference.
18. The method for determining an in-cell short circuit according to claim 15, further comprising:
when the internal short-circuit current ISAnd if the voltage is less than or equal to the preset value, determining that the battery has no internal short circuit.
19. The method of determining an in-cell short circuit according to claim 1, further comprising:
when the difference between the voltage V2 and the voltage V1 is greater than the second threshold, reducing the constant current ICAnd collecting a voltage V1, collecting a voltage V2, and comparing the voltage V2 with the voltage V1 until a difference between the voltage V2 and the voltage V1 is between the first threshold and the second threshold or the constant current ICTo less than or equal to the minimum charging current of the charging device.
20. The method for determining an in-cell short circuit according to claim 19, further comprising:
when the constant current ICDecreasing to less than or equal to a minimum charging current of a charging device, determining that there is no internal short circuit in the battery.
21. The method for determining short circuit in battery according to claim 19, wherein the decreasing constant current ICThe method comprises the following steps:
reduceConstant current ICIs IC/2。
22. An electronic device, comprising:
a battery;
a processor; and
a memory, in which a plurality of program modules are stored, the program modules being loaded by the processor and executing the method for determining an in-battery short circuit according to any one of claims 1 to 21 to detect an in-battery short circuit.
23. A storage medium having stored thereon at least one computer instruction, wherein the instruction is loaded by a processor to perform the method of any one of claims 1-21.
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