CN111142030B

CN111142030B - Method, device and equipment for detecting internal short-circuit current and readable storage medium

Info

Publication number: CN111142030B
Application number: CN201911394483.7A
Authority: CN
Inventors: 谢红斌; 张俊
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2022-02-25
Anticipated expiration: 2039-12-30
Also published as: WO2021136384A1; CN111142030A

Abstract

The disclosure provides a method, a device, equipment and a readable storage medium for detecting an internal short circuit current. The method is applied to the equipment to be charged and comprises the following steps: sequentially determining respective average electric quantity change values of the battery at a plurality of time intervals from a first moment in the charging and discharging process of the battery; determining a theoretical average electric quantity change value of the battery in a time period from the first moment based on the average electric quantity change value of each time interval; calculating the actual average electric quantity change value of the battery in a time period; determining the average internal short-circuit current of the battery in a time period according to the theoretical electric quantity change value and the actual average electric quantity change value; wherein the time period comprises a plurality of time intervals. By the method, the accuracy of the detection result of the short circuit in the battery is improved, and the probability of misjudgment is reduced, so that the safety problem caused by the internal short circuit of the battery in the electronic equipment can be effectively avoided.

Description

Method, device and equipment for detecting internal short-circuit current and readable storage medium

Technical Field

The present disclosure relates to the field of electronic devices, and in particular, to a method, an apparatus, a device, and a readable storage medium for detecting an internal short circuit current.

Background

In electronic devices (e.g., smart devices such as smart phones and tablet computers), lithium ion batteries are generally used. With the continuous development of batteries and battery management technologies, the charging speed of lithium ion batteries is faster and faster, the capacity is larger and larger, and the user experience of electronic products is improved to a great extent. However, the service life of the battery also largely determines the service life of the electronic device, and the use safety of the battery is also receiving more and more attention from consumers.

Generally, a protection board is added to a lithium ion battery to control the processes of overcharge, overdischarge, overvoltage, overcurrent, temperature rise and the like of the lithium ion battery, which influence the use safety of the battery, so that the use safety of the mobile terminal is ensured. But the protection board cannot detect a short circuit, a leakage current, and the like inside the battery at present. Although these problems are slow in progress, safety problems such as thermal runaway, overcharge, or overdischarge may also occur to some extent.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

An object of the present disclosure is to provide a method, apparatus, device and readable storage medium for detecting an internal short circuit current, which overcome, at least to some extent, the problem of inaccurate detection of an internal short circuit of a battery due to the limitations of the related art.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

According to an aspect of the present disclosure, there is provided a method of detecting an open circuit voltage of a battery, including: in the charging and discharging process of a battery, obtaining a first open-circuit voltage of the battery at a first moment; sequentially determining a plurality of open-circuit voltages of the battery at the first moment according to the first open-circuit voltage and the relationship between the preset open-circuit voltage and the internal resistance of the battery; when the absolute value of the difference between the two adjacent determined open-circuit voltages is smaller than or equal to a first voltage threshold, determining the determined open-circuit voltage at the latter time as the final open-circuit voltage of the battery at the first time.

According to another aspect of the present disclosure, there is provided a method of detecting an internal short circuit current, including: sequentially determining respective average electric quantity change values of the battery at a plurality of time intervals from a first moment in the charging and discharging process of the battery; determining a theoretical average electric quantity change value of the battery in a time period from the first moment based on the average electric quantity change value of each time interval; calculating the actual average electric quantity change value of the battery in the time period; determining the average internal short-circuit current of the battery in the time period according to the theoretical electric quantity change value and the actual average electric quantity change value; wherein the time period comprises the plurality of time intervals.

According to still another aspect of the present disclosure, there is provided a battery open-circuit voltage determination apparatus including: the open-circuit voltage obtaining module is used for obtaining a first open-circuit voltage of the battery at a first moment in the charging and discharging process of the battery; the open-circuit voltage determining module is used for sequentially determining a plurality of open-circuit voltages of the battery at the first moment according to the first open-circuit voltage and the relationship between the preset open-circuit voltage and the internal resistance of the battery; when the absolute value of the difference between the two adjacent determined open-circuit voltages is smaller than or equal to a first voltage threshold, determining the determined open-circuit voltage at the latter time as the final open-circuit voltage of the battery at the first time.

According to still another aspect of the present disclosure, there is provided an internal short circuit current detection apparatus including: an average electric quantity determining module, configured to sequentially determine, during charging and discharging of a battery, respective average electric quantity change values of the battery at a plurality of time intervals from the first time: the theoretical electric quantity determining module is used for determining a theoretical average electric quantity change value of the battery in a time period from the first moment based on the average electric quantity change value of each time interval; the actual electric quantity determining module is used for calculating an actual average electric quantity change value of the battery in the time period; the internal short-circuit current determining module is used for determining the average internal short-circuit current of the battery in the time period according to the theoretical electric quantity change value and the actual average electric quantity change value; wherein the time period comprises the plurality of time intervals.

According to still another aspect of the present disclosure, there is provided an electronic device including: a memory, a processor and executable instructions stored in the memory and executable in the processor, the processor implementing any of the methods described above when executing the executable instructions.

According to yet another aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon computer-executable instructions that, when executed by a processor, implement any of the methods described above.

In the method for detecting an internal short-circuit current provided by the embodiment of the disclosure, in order to detect an internal short-circuit current within a preset time period, the time period is divided into a plurality of time intervals, average electric quantity changes of the time intervals are respectively calculated, a theoretical average electric quantity change value of the time period is obtained after the average electric quantity changes of the time intervals are averaged, and then the average internal short-circuit current within the time period is jointly detected through the calculated actual electric quantity change value of the time period. By the method, the accuracy of the detection result of the short circuit in the battery is improved, and the probability of misjudgment is reduced, so that the safety problem caused by the internal short circuit of the battery in the electronic equipment can be effectively avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 schematically shows a flowchart of a method for detecting an open-circuit voltage of a battery in an embodiment of the present disclosure.

Fig. 2 schematically shows a flowchart of another method for detecting an open-circuit voltage of a battery in the embodiment of the present disclosure.

Fig. 3 is a flowchart illustrating a method for detecting an open-circuit voltage of a battery according to another embodiment of the present disclosure.

Fig. 4 exemplarily shows a flowchart of a method for detecting an internal short-circuit current in an embodiment of the present disclosure.

Fig. 5 exemplarily shows a flowchart of another internal short-circuit current detection method in the embodiment of the present disclosure.

Fig. 6 is a flow chart schematically illustrating a method for detecting an internal short-circuit current according to another embodiment of the present disclosure.

Fig. 7 exemplarily shows a block diagram of a determination apparatus of a battery open-circuit voltage in an embodiment of the present disclosure.

Fig. 8 is a block diagram schematically illustrating an internal short-circuit current detection device according to an embodiment of the present disclosure.

Fig. 9 exemplarily illustrates a block diagram of an electronic device in an embodiment of the present disclosure.

Fig. 10 schematically illustrates a schematic diagram of a computer-readable storage medium in an embodiment of the present disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

A terminal Voltage of the battery in an Open state is referred to as an Open Circuit Voltage (OCV). The open circuit voltage of a battery is equal to the difference between the positive electrode potential and the negative electrode potential of the battery when the battery is open circuited (i.e., when no current is passing through the two electrodes).

In the related art, in a scheme of detecting a micro short circuit or a leakage current of a battery by an open voltage, the open voltage is generally calculated using an instantaneous current value and a voltage value measured during charge and discharge of the battery. Due to the large fluctuation of the instantaneous value, the accuracy of the open-circuit voltage is reduced, and the detection accuracy of the micro short circuit or the leakage current of the battery is further influenced.

The embodiment of the disclosure firstly provides a method for detecting the open-circuit voltage of a battery, which is used for providing a more accurate open-circuit voltage detection value for the battery.

Hereinafter, each step of the method for detecting the open-circuit voltage of the battery according to the exemplary embodiment of the present disclosure will be described in more detail with reference to the drawings and examples.

Fig. 1 schematically shows a flowchart of a method for detecting an open-circuit voltage of a battery in an embodiment of the present disclosure. The method provided by the embodiment of the disclosure can be applied to any equipment to be charged.

The device to be charged may be, for example, a terminal or a communication terminal including, but not limited to, a device arranged to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network and/or via, for example, a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a digital video broadcasting-handheld (DVB-H) network, a satellite network, an amplitude modulation-frequency modulation (AM-FM) broadcast transmitter, and/or a wireless interface of another communication terminal. Communication terminals arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", and/or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communication System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data communication capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. In addition, the terminal may further include, but is not limited to, a rechargeable electronic device having a charging function, such as an electronic book reader, a smart wearable device, a mobile power source (e.g., a charger, a travel charger), an electronic cigarette, a wireless mouse, a wireless keyboard, a wireless headset, a bluetooth speaker, and the like.

Referring to fig. 1, a charge control method 10 includes:

in step S102, a first open-circuit voltage of the battery at a first time is obtained during charging and discharging of the battery.

The first time may be, for example, a time when the battery is in a charging or discharging stable state, and the stable state may be that the battery is in a static-like state, such as at least one of the following states: the charging current or the discharging current of the battery is smaller than a first current threshold (the first current threshold may be 0.01C, for example, where C is a charging rate), the voltage fluctuation of the battery is smaller than a first voltage fluctuation threshold (the first voltage fluctuation threshold may be 20 μ V/sec, for example), the average current of the battery is smaller than a second current threshold within a first time threshold (the first time threshold may be 100 sec, for example, and the second current threshold may be 0.01C, for example), and the average voltage fluctuation of the battery is smaller than a second voltage fluctuation threshold within a second time threshold (the second time threshold may be 100 sec, for example, and the second voltage fluctuation threshold may be 20 μ V/sec, for example). It should be noted that the above specific thresholds are only examples, and do not limit the disclosure.

The open-circuit voltage may be calculated, for example, from the voltage and current at the present time, such as OCV-I R, where U is the instantaneous voltage at the present time, I is the instantaneous current, and R is the internal resistance of the battery.

In step S104, a plurality of open circuit voltages of the battery at the first time are sequentially determined according to the first open circuit voltage and a relationship between a preset open circuit voltage and the internal resistance of the battery.

In the process of sequentially determining a plurality of open-circuit voltages of the battery at a first moment, when the absolute value of the difference between the open-circuit voltages determined at two adjacent times is less than or equal to a first voltage threshold, determining the open-circuit voltage determined at the latter time as the final open-circuit voltage of the battery at the first moment.

For example, first, based on the first open-circuit voltage OCV11, by querying a relationship between a preset open-circuit voltage and an internal resistance of the battery, a first internal resistance value R11 of the battery at a first time may be queried; determining a second open-circuit voltage OCV12 of the battery at the first moment according to the voltage U1 and the current I1 of the battery at the first moment and a first internal resistance value R11, such as OCV 12-U1-I1-R11; based on the second open-circuit voltage OCV12, querying a relationship between a preset open-circuit voltage and the internal resistance of the battery, so as to query a second internal resistance value R12 of the battery at the first moment; and determining a third open circuit voltage OCV13 of the battery at the first moment according to the voltage U1, the current I1 and the second internal resistance value R12 of the battery at the first moment, such as OCV 13-U1-I1-R12.

The relationship between the preset open circuit voltage and the internal resistance of the battery may be stored in the device to be charged in advance, for example, in a memory of the device to be charged. The relationship may be constructed by, for example, empirical values obtained by laboratory tests or the like, and the disclosure is not limited thereto.

Next, the magnitudes of the third open circuit voltage OCV13 and the second open circuit voltage OCV12 are compared.

When the absolute value of the difference between the third open-circuit voltage OCV13 and the second open-circuit voltage OCV12 is less than or equal to the first voltage threshold, it is determined that the third open-circuit voltage OCV13 is the final open-circuit voltage of the battery at the first timing.

When the absolute value of the difference between the third open-circuit voltage OCV13 and the second open-circuit voltage OCV12 is greater than the first voltage threshold, the relationship between the preset open-circuit voltage and the internal resistance of the battery is queried based on the third open-circuit voltage OCV13, so as to query a third internal resistance value R13 of the battery at the first moment; and determining the fourth circuit voltage OCV14 of the battery at the first moment according to the voltage U1 and the current I1 and the third internal resistance value R13 of the battery at the first moment, such as OCV 14-U1-I1-R13.

By analogy, the magnitude of the fourth open-circuit voltage OCV14 and the magnitude of the third open-circuit voltage OCV13 are continuously compared, and whether the fourth open-circuit voltage OCV14 is used as the final open-circuit voltage is determined.

The first voltage threshold may be configured as a threshold in units of voltage as described above, and may be further configured as a percentage. It will be understood by those skilled in the art that when the first voltage threshold is configured as a percentage (e.g. 5%), the absolute value of the difference between the two adjacent open circuit voltages calculated above needs to be divided by the current open circuit voltage or the previous open circuit voltage, etc. so as to be compared with the first voltage threshold.

According to the detection method for the battery open-circuit voltage, provided by the embodiment of the disclosure, due to the adoption of a multi-iteration algorithm, compared with the open-circuit voltage directly calculated based on instantaneous voltage and current, the result is more accurate. The internal short-circuit current of the battery is detected based on the open-circuit voltage of the battery detected by the method, and the detection accuracy of the internal short-circuit current is effectively improved.

Furthermore, based on the method, the open circuit voltages of the battery at different times can be respectively detected, the corresponding accurate Depth of Discharge (DOD) can be further inquired, then, the electric quantity change value Δ Q of the battery can be calculated according to the integration, and further, the remaining maximum capacity value of the battery at the stage can be calculated to update the calculation of the fuel gauge, for example, Qmax ═ Δ Q/(D0D1-D0D2), wherein DOD1 and DOD2 correspond to the Depth of Discharge at different times.

Fig. 2 schematically shows a flowchart of another method for detecting an open-circuit voltage of a battery in the embodiment of the present disclosure. Unlike the method shown in fig. 1, the method shown in fig. 2 further provides an embodiment of obtaining the first open-circuit voltage of the battery at the first time during the charging and discharging processes of the battery, that is, specifically provides an embodiment of step S102.

Referring to fig. 2, step S102 includes:

in step S1022, the initial depth of discharge of the battery at the initial timing is acquired.

For example, at the initial moment of charging and discharging the batteries, the initial depth of discharge DOD0 of the batteries is respectively obtained.

In step S1024, a first power variation value of the battery from the initial time to the first time is determined.

For example, the first electrical quantity change value Δ Q from the initial time to the first time may be calculated by integrating the current.

As described above, the first timing is, for example, a timing at which the battery is in a stable state of charge or discharge.

In step S1026, a first depth of discharge of the battery at a first time is determined based on the initial depth of discharge, the first amount of change, and the maximum rated capacity of the battery.

For example, the first depth of discharge D0D1 at the first time is D0D0- Δ Q/Qmax. Where Qmax is the maximum rated capacity of the battery.

In step S1028, a first open-circuit voltage is obtained based on the first depth of discharge and a preset relationship between the depth of discharge and the open-circuit voltage.

The relationship between the preset depth of discharge and the open circuit voltage may be stored in the device to be charged in advance, for example, in a memory of the device to be charged. The relationship may be constructed by, for example, empirical values obtained by laboratory tests or the like, and the disclosure is not limited thereto.

After the first depth of discharge DOD1 is calculated through step S1026, the first open-circuit voltage OCV11 may be obtained by inquiring the relationship.

Referring to fig. 3, the method 20 for detecting the open-circuit voltage of the battery includes:

in step S202, an initial depth of discharge of the battery at an initial timing is acquired.

In step S204, a first charge variation value of the battery from the initial time to the first time is determined.

In step S206, a first depth of discharge of the battery at a first time is determined based on the initial depth of discharge, the first amount of change, and the maximum rated capacity of the battery.

In step S208, a first open-circuit voltage is obtained based on the first depth of discharge and a relationship between a preset depth of discharge and the open-circuit voltage.

As mentioned above, the relationship between the preset depth of discharge and the open circuit voltage, as may be stored in advance in the device to be charged, for example in a memory of the device to be charged.

After the first depth of discharge DOD1 is calculated through step S206, the first open-circuit voltage OCV11 may be obtained by inquiring the relationship.

In step S210, based on the first open-circuit voltage OCV11, a relationship between a preset open-circuit voltage and an internal resistance of the battery is queried, and a first internal resistance value R11 of the battery at a first time is queried.

In step S212, a second open-circuit voltage OCV12 of the battery at the first time is determined according to the voltage U1 and the current I1 of the battery at the first time and the first internal resistance value R11.

Such as OCV 12-U1-I1-R11.

In step S214, based on the second open-circuit voltage OCV12, the relationship between the preset open-circuit voltage and the internal resistance of the battery is queried, and a second internal resistance value R12 of the battery at the first time is queried.

In step S216, the third open circuit voltage OCV13 of the battery at the first time is determined according to the voltage U1 and the current I1 of the battery at the first time and the second internal resistance value R12.

Such as OCV 13-U1-I1-R12.

In step S218, it is determined whether the absolute value of the difference between the third open circuit voltage OCV13 and the second open circuit voltage OCV12 is less than the first voltage threshold.

If so, the process proceeds to step S220.

Otherwise, returning to step S214, based on the third open-circuit voltage OCV13, the third internal resistance value R13 is queried; then, step S216 is executed to calculate a fourth circuit voltage OCV14 according to the third internal resistance value R13; the process proceeds to step S218, and the fourth open circuit voltage OCV14 and the third open circuit voltage OCV13 are compared again. And repeating the steps until the absolute value of the difference between the two adjacent calculated open-circuit voltages is smaller than the first voltage threshold.

It should be noted that, although steps S214 to S210 in the figure are exemplified by calculating the second open circuit voltage OCV12 and the third open circuit voltage OCV13, querying the second internal resistance value R12 and determining the third open circuit voltage OCV13, as described above, those skilled in the art can understand that the loop process is an iterative process, and the previous iteration result is used as the calculation basis for the next iteration.

Likewise, the first voltage threshold may be configured as a threshold in units of voltage as described above, and may be further configured as a percentage. It will be understood by those skilled in the art that when the first voltage threshold is configured as a percentage (e.g. 5%), the absolute value of the difference between the two adjacent open circuit voltages calculated above needs to be divided by the current open circuit voltage or the previous open circuit voltage, etc. so as to be compared with the first voltage threshold.

In step S220, the third open circuit voltage OCV13 is used as the open circuit voltage of the battery at the first timing.

Fig. 4 exemplarily shows a flowchart of a method for detecting an internal short-circuit current in an embodiment of the present disclosure. The method can be applied to the device to be charged.

Referring to fig. 4, the method 30 for detecting an internal short circuit current includes:

in step S302, respective average charge amount variation values of the battery at a plurality of time intervals from the first time are sequentially determined.

As mentioned above, the first time may be, for example, a time when the battery is in a stable state of charge or discharge, and the stable state may be that the battery is in a quasi-static state, such as at least one of the following states: the charging current or the discharging current of the battery is smaller than a first current threshold (the first current threshold may be 0.01C, for example, where C is a charging rate), the voltage fluctuation of the battery is smaller than a first voltage fluctuation threshold (the first voltage fluctuation threshold may be 20 μ V/sec, for example), the average current of the battery is smaller than a second current threshold within a first time threshold (the first time threshold may be 100 sec, for example, and the second current threshold may be 0.01C, for example), and the average voltage fluctuation of the battery is smaller than a second voltage fluctuation threshold within a second time threshold (the second time threshold may be 100 sec, for example, and the second voltage fluctuation threshold may be 20 μ V/sec, for example). It should be noted that the above specific thresholds are only examples, and do not limit the disclosure.

In order to detect a theoretical average electric quantity variation value of a preset time period from a first moment, the time period is divided into a preset number of time intervals, and the average electric quantity variation of each time interval is respectively determined.

For example, an average charge variation value in each time interval may be calculated based on the depth of discharge and the maximum rated capacity in each time interval.

In step S304, a theoretical average charge amount change value of the battery for a period from the first time is determined based on the average charge amount change value for each time interval.

Wherein the time period comprises a plurality of time intervals as described above.

In step S306, an actual average charge variation value of the battery over a period of time is calculated.

The current of the battery over the period of time may be integrated to calculate an actual average charge change value.

E.g., Δ Q real ═ idt.

In step S308, an average internal short-circuit current of the battery in the time period is determined according to the theoretical charge variation value and the actual average charge variation value.

The average internal short-circuit current of the period of time can be calculated, for example, by the following equation:

i ═ Δ Q (Δ Q plain- Δ Q real)/t

Wherein, I is the average internal short-circuit current in the time period, Δ Q is the theoretical average electric quantity variation value of the time period, Δ Q is the actual average electric quantity variation value of the time period, and t is the duration of the time period.

In some embodiments, further comprising: in step S310, it is determined that the internal short circuit occurs in the battery when the internal short circuit current is greater than the internal short circuit current threshold.

The internal short circuit current threshold may be determined according to the actual usage of the battery, including the cell capacity, and may be set to 20mA, for example.

Upon detecting that the average internal short circuit current is above the internal short circuit threshold, indicating that an internal short circuit has occurred with the battery, a response may be made, such as ceasing use of the battery.

It should be noted that, when the method is applied, when the battery in the device to be charged includes a plurality of battery cells, the device to be charged may further perform the above operations on a per battery cell basis, and when an internal short circuit is detected in one or more of the battery cells, a response is made to stop the use of the one or more battery cells, for example.

Fig. 5 exemplarily shows a flowchart of another internal short-circuit current detection method in the embodiment of the present disclosure. Unlike the method shown in fig. 4, fig. 5 further provides an embodiment of sequentially determining respective average charge amount variation values of the battery at a plurality of time intervals from the first time, that is, specifically provides an embodiment of step S302.

As shown in fig. 5, step S302 includes:

step S3022: and sequentially determining a plurality of open-circuit voltages of the battery at each time interval based on the relationship between the preset open-circuit voltage and the internal resistance of the battery.

In the process of determining a plurality of open-circuit voltages in each time interval, when the absolute value of the difference between two adjacent determined open-circuit voltages is less than or equal to the first voltage threshold, the determined open-circuit voltage at the next time is the final open-circuit voltage of the battery in the time interval.

In some embodiments, taking the determination of the plurality of open-circuit voltages of the first time interval as an example, the step S3042 may further include: firstly, based on the first open-circuit voltage OCV11, querying a relationship between a preset open-circuit voltage and an internal resistance of the battery, a first internal resistance value R11 of the battery at the time interval can be queried; determining a second open-circuit voltage OCV12 of the battery in the time interval according to the voltage U1 and the current I1 of the battery at the first moment and the first internal resistance value R11, such as OCV 12-U1-I1-R11; based on the second open-circuit voltage OCV12, querying a relationship between a preset open-circuit voltage and the internal resistance of the battery, so as to query a second internal resistance value R12 of the battery at the first moment; and determining a third open-circuit voltage OCV13 of the battery in the time interval according to the voltage U1 and the current I1 of the battery in the time interval and the second internal resistance value R12, such as OCV 13-U1-I1-R12.

The relationship between the preset open circuit voltage and the internal resistance of the battery may be stored in the device to be charged in advance, for example, in a memory of the device to be charged.

When the absolute value of the difference between the third open circuit voltage OCV13 and the second open circuit voltage OCV12 is less than or equal to the first voltage threshold value, the third open circuit voltage OCV13 is determined to be the final open circuit voltage T _ OCV1 of the battery at the time interval.

When the absolute value of the difference between the third open-circuit voltage OCV13 and the second open-circuit voltage OCV12 is greater than the first voltage threshold, the relationship between the preset open-circuit voltage and the internal resistance of the battery is queried based on the third open-circuit voltage OCV13, so as to query a third internal resistance value R13 of the battery at the time interval; and determining the fourth circuit voltage OCV14 of the battery in the time interval according to the voltage U1 and the current I1 of the battery in the time interval and the third internal resistance value R13, such as OCV 14-U1-I1-R13.

By analogy, the magnitude of the fourth open circuit voltage OCV14 and the magnitude of the third open circuit voltage OCV13 are continuously compared, and it is determined whether the fourth open circuit voltage OCV14 is used as the final open circuit voltage T _ OCV 1.

In some embodiments, the first open-circuit voltage OCV11 may be obtained, for example, by:

s1: the initial depth of discharge of the battery at the initial time is obtained.

S2: a first electric quantity change value of the battery from the initial moment to the first moment is determined.

S3: a first depth of discharge of the battery at a first time is determined based on the initial depth of discharge, the first amount of change, and a maximum rated capacity of the battery.

S4: and obtaining a first open-circuit voltage based on the first discharge depth and the relation between the preset discharge depth and the open-circuit voltage.

After the first depth of discharge DOD1 is calculated through S4, the first open-circuit voltage OCV11 may be obtained by inquiring the relationship.

It should be noted that, in the first time interval, the obtained first open-circuit voltage OCV11 is used as the open-circuit voltage for querying the first resistance value R11. In the calculation of the subsequent time interval, the open circuit voltage may be determined based on the depth of discharge of the time interval preceding the time interval. Taking the second time interval as an example, the final open circuit voltage T _ OCV1 determined by the first time interval can be used to look up the corresponding T _ DOD 1. Then, a new depth of discharge DOD2 is calculated based on the actual change in charge in the first time interval (which can be determined by integrating the current in the time interval) and T _ DOD1, and then the corresponding OCV21 is queried according to the relationship between the depth of discharge and the open circuit voltage as the open circuit voltage for querying the first resistance value R21 in the second time interval, and so on.

In this step, in order to calculate the final open circuit voltage of the time interval, the embodiment of the present disclosure uses an iterative algorithm to calculate a plurality of open circuit voltages respectively, and only when the absolute value of the difference between two adjacent determined open circuit voltages is less than or equal to the first voltage threshold, the iterative process is stopped, and the determined open circuit voltage at the next time is determined to be the final open circuit voltage of the battery at the time interval. The open-circuit voltage determined by the iterative algorithm is more accurate than the open-circuit voltage determined by adopting the instantaneous voltage and current.

Step S3024: and respectively determining the average electric quantity change value of each time interval based on the determined final open-circuit voltage of each time interval and the relationship between the preset depth of discharge and the open-circuit voltage.

As mentioned above, the relationship between the preset depth of discharge and the open circuit voltage, as may be stored in advance in the device to be charged, for example in a memory of the device to be charged. Based on the relationship, the discharge depth of the final open-circuit voltage corresponding to each time interval can be inquired, and the average electric quantity change value of the time interval is determined according to the discharge depth.

In some embodiments, step S3024 may include the following steps, as appropriate:

s1: and respectively obtaining the discharge depth of each time interval based on the final open-circuit voltage of each time interval and the relation between the discharge depth and the open-circuit voltage.

S2: and respectively determining the average electric quantity change value of each time interval according to the discharge depth of each time interval and the maximum rated capacity of the battery.

For example, the average charge variation value for each time interval may be determined according to the following formula:

△Q_n＝Qmax/(T_D0D_n-T_D0D_n-1)

where Δ Qn is the average charge variation value of the nth time interval, Qmax is the maximum rated capacity of the battery, and T _ D0D_nDepth of discharge, T _ D0D, for the nth time interval_n-1Is the depth of discharge for the (n-1) th time interval. For the first time interval, T _ D0D_n-1Such as DOD1 may be used.

Further, in order to determine the average change of the power in each time interval, an iterative algorithm is further adopted to calculate the average open-circuit voltage of the time interval, and the average open-circuit voltage is more accurate than the open-circuit voltage calculated by using the instantaneous voltage and current.

Referring to fig. 6, the method 40 of detecting the internal short circuit current includes:

in step S402, an initial depth of discharge of the battery at an initial time is acquired.

In step S404, a first charge variation value of the battery from the initial time to the first time is determined.

For example, the first electrical quantity change Δ Q1 from the initial time to the first time may be calculated by integrating the current.

In step S406, a first depth of discharge of the battery at a first time is determined based on the initial depth of discharge, the first amount of change in charge, and the maximum rated capacity of the battery.

For example, the first depth of discharge D0D1 at the first time is D0D0- Δ Q1/Qmax. Where Qmax is the maximum rated capacity of the battery.

In step S408, a first open-circuit voltage is obtained based on the first depth of discharge and a relationship between a preset depth of discharge and the open-circuit voltage.

After the first depth of discharge DOD1 is calculated through step S406, the open-circuit voltage OCV11 for the first time interval may be obtained by inquiring the relationship.

In step S410, a final open-circuit voltage T _ OCV1 for a first time interval is determined by an iterative algorithm based on the first open-circuit voltage OCV11, and a corresponding T _ DOD1 is queried.

The specific iterative algorithm is as described above, and is not described herein again.

The above steps S402 to S410 are used to determine the final open circuit voltage T _ OCV1 and the corresponding T _ DOD1 in the first time interval.

In step S412, a second charge variation value of the battery at the first time interval is determined.

For example, the second electrical quantity change Δ Q2 in the first time interval can be calculated by integrating the current.

In step S414, a second depth of discharge of the battery at a second time interval is determined based on T _ DOD1, the second charge variation value, and the maximum rated capacity of the battery.

For example, the second depth of discharge D0D2 ═ T _ D0D1- Δ Q2/Qmax at the second time interval. Where Qmax is the maximum rated capacity of the battery.

In step S416, a second open-circuit voltage OCV21 for a second time interval is obtained based on the second depth of discharge and a preset relationship between the depth of discharge and the open-circuit voltage.

After the first depth of discharge DOD1 is calculated through step S414, the first open-circuit voltage OCV21 for the second time interval may be obtained by inquiring the relationship.

In step S418, a final open circuit voltage T _ OCV2 for a second time interval is determined by an iterative algorithm based on the first open circuit voltage OCV21, and a corresponding T _ DOD2 is queried.

The above steps S412 to S418 are used to determine the final open circuit voltage T _ OCV2 and the corresponding T _ DOD2 for the second time interval.

In a similar manner as in steps S412-S418, the final open-circuit voltages T _ OCV 3-T _ OCVn and the corresponding depths of discharge T _ DOD 3-T _ DODn for other time intervals can be determined.

It should be noted that the number of time intervals may be determined according to the requirement of the actual application, and the disclosure is not limited thereto.

In step S420, the discharge depth of each time interval is obtained based on the final open circuit voltage and the relationship between the discharge depth and the open circuit voltage of each time interval, respectively.

In step S422, an average power change value for each time interval is determined according to the discharge depth of each time interval and the maximum rated capacity of the battery.

△Q_n＝Qmax/(T_D0D_n-T_D0D_n-1)

wherein, Delta Q_nIs the average charge variation value of the nth time interval, Qmax is the maximum rated capacity of the battery, T _ D0D_nDepth of discharge, T _ D0D, for the nth time interval_n-1Is the depth of discharge for the (n-1) th time interval. For the first time interval, T _ D0D_n-1Such as DOD1 may be used.

In step S424, a theoretical average charge amount change value of the battery for a period of time from the first time is determined based on the average charge amount change value for each time interval.

In step S426, an actual average charge variation value of the battery over the period of time is calculated.

E.g. DELTA Q_{Fruit of Chinese wolfberry}＝∫idt。

In step S428, an average internal short-circuit current of the battery over the period of time is determined based on the theoretical charge variation value and the actual average charge variation value.

I＝(△Q_{flat plate}-△Q_{Fruit of Chinese wolfberry})/t

Wherein I is the average internal short circuit current in the time period, and Delta Q_{Flat plate}The theoretical average charge variation value, Δ Q, for the time period_{Fruit of Chinese wolfberry}The actual average electric quantity variation value of the time period is t, and t is the duration of the time period.

Those skilled in the art will appreciate that all or part of the steps implementing the above embodiments are implemented as computer programs executed by a CPU. When executed by the CPU, performs the functions defined by the above-described methods provided by the present disclosure.

Furthermore, it should be noted that the above-mentioned figures are only schematic illustrations of the processes involved in the methods according to exemplary embodiments of the present disclosure, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.

The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods. For details not disclosed in the embodiments of the apparatus of the present disclosure, refer to the embodiments of the method of the present disclosure.

Referring to fig. 7, the determination device 50 of the battery open-circuit voltage includes: an open circuit voltage obtaining module 502 and an open circuit voltage determining module 504.

The open-circuit voltage obtaining module 502 is configured to obtain a first open-circuit voltage of the battery at a first time according to a charging and discharging process of the battery.

The open-circuit voltage determining module 504 is configured to sequentially determine a plurality of open-circuit voltages of the battery at a first time according to the first open-circuit voltage and a relationship between a preset open-circuit voltage and an internal resistance of the battery; when the absolute value of the difference between the two adjacent determined open-circuit voltages is smaller than or equal to the first voltage threshold, the determined open-circuit voltage at the latter time is the final open-circuit voltage of the battery at the first time.

In some embodiments, the open circuit voltage determination module 504 includes: the device comprises a first internal resistance value query unit, a first voltage determination unit, a second internal resistance value query unit and a second voltage determination unit. The first internal resistance value query unit is used for querying a first internal resistance value of the battery at a first moment based on the first open-circuit voltage and the relation between the open-circuit voltage and the internal resistance of the battery. The first voltage determining unit is used for determining a second open-circuit voltage of the battery at a first moment according to the voltage and the current of the battery at the first moment and the first internal resistance value. The second internal resistance value query unit is used for querying a second internal resistance value of the battery at the first moment based on the second open-circuit voltage and the relation between the open-circuit voltage and the internal resistance of the battery. The second voltage determining unit is used for determining the third open-circuit voltage of the battery at the first moment according to the voltage and the current of the battery at the first moment and the second internal resistance value.

In some embodiments, the open circuit voltage determination module 504 further comprises: and the first voltage comparison unit is used for determining the third open-circuit voltage as the final open-circuit voltage of the battery at the first moment when the absolute value of the difference between the third open-circuit voltage and the second open-circuit voltage is less than or equal to the first voltage threshold.

In some embodiments, the first voltage comparison unit is further configured to, when the absolute value of the difference between the third open-circuit voltage and the second open-circuit voltage is greater than the first voltage threshold, query a third internal resistance value of the battery at the first time based on the third open-circuit voltage and a relationship between the open-circuit voltage and the internal resistance of the battery; and determining the fourth circuit voltage of the battery at the first moment according to the voltage and the current of the battery at the first moment and the third internal resistance value.

In some embodiments, the open circuit voltage obtaining module 502 includes: the device comprises a discharge depth acquisition unit, an electric quantity change value determination unit, a discharge depth determination unit and an open-circuit voltage acquisition unit. The discharging depth acquiring unit is used for acquiring the initial discharging depth of the battery at the initial moment. The electric quantity change value determination unit is used for determining a first electric quantity change value of the battery from the initial moment to the first moment. The depth of discharge determination unit is used for determining a first depth of discharge of the battery at a first moment based on the initial depth of discharge, the first electric quantity change value and the maximum rated capacity of the battery. The open-circuit voltage obtaining unit is used for obtaining a first open-circuit voltage based on the first discharge depth and the relation between the preset discharge depth and the open-circuit voltage.

In some embodiments, the first time is a time when the battery is in a charging or discharging steady state, the steady state comprising at least one of: the charging current or the discharging current of the battery is smaller than a first current threshold value, the voltage fluctuation of the battery is smaller than a first voltage fluctuation threshold value, the average current of the battery is smaller than a second current threshold value within a first time threshold value, and the average voltage fluctuation of the battery is smaller than a second voltage fluctuation threshold value within a second time threshold value.

According to the detection device for the battery open-circuit voltage, which is provided by the embodiment of the disclosure, due to the adoption of a multi-iteration algorithm, compared with the open-circuit voltage directly calculated based on instantaneous voltage and current, the result is more accurate. The internal short-circuit current of the battery is detected based on the open-circuit voltage of the battery detected by the method, and the detection accuracy of the internal short-circuit current is effectively improved.

Referring to fig. 8, the internal short-circuit current detection device 60 includes: an average charge determination module 602, a theoretical charge determination module 604, an actual charge determination module 606, and an internal short circuit current determination module 608.

The average power determining module 602 is configured to sequentially determine respective average power variation values of the battery at a plurality of time intervals from a first time point during charging and discharging of the battery.

The theoretical power determining module 604 is configured to determine a theoretical average power variation value of the battery in a time period from the first time based on the average power variation value of each time interval.

The actual charge determination module 606 is configured to calculate an actual average charge variation value of the battery over the time period.

The internal short-circuit current determination module 608 is configured to determine an average internal short-circuit current of the battery over a time period according to the theoretical charge variation value and the actual average charge variation value.

Wherein the time period comprises a plurality of time intervals.

In some embodiments, the average power determination module 602 includes: an open circuit voltage determining unit and an electric quantity change value determining unit. The open-circuit voltage determining unit is used for sequentially determining a plurality of open-circuit voltages of the battery at each time interval based on the relation between the preset open-circuit voltage and the internal resistance of the battery; in the process of determining a plurality of open-circuit voltages in each time interval, when the absolute value of the difference between two adjacent determined open-circuit voltages is less than or equal to the first voltage threshold, determining the determined open-circuit voltage at the next time as the final open-circuit voltage of the battery in the time interval. The electric quantity change value determining unit is used for respectively determining the average electric quantity change value of each time interval based on the determined final open-circuit voltage of each time interval and the relationship between the preset discharge depth and the open-circuit voltage.

In some embodiments, the power variation value determination unit includes: a discharge depth determining subunit and an average variation value determining subunit. And the discharge depth determining subunit is used for respectively obtaining the discharge depths of the time intervals based on the final open-circuit voltage of the time intervals and the relationship between the discharge depths and the open-circuit voltage. The average change value determining subunit is configured to determine the average electricity change value of each time interval according to the discharge depth of each time interval and the maximum rated capacity of the battery, for example, the average electricity change value of each time interval may be determined according to the following formula:

△Q_n＝Qmax/(T_D0D_n-T_D0D_n-1)

where Δ Qn is the average charge variation value of the nth time interval, Qmax is the maximum rated capacity of the battery, and T _ D0D_nDepth of discharge, T _ D0D, for the nth time interval_n-1Is the depth of discharge for the (n-1) th time interval.

In some embodiments, the open circuit voltage determining unit includes: the voltage-based power supply comprises a first internal resistance value inquiry subunit, a first voltage determination subunit, a second internal resistance value inquiry subunit and a second voltage determination subunit. The first internal resistance value inquiry subunit is used for inquiring the first internal resistance value of the battery at a time interval based on the preset open-circuit voltage and the relation between the open-circuit voltage and the internal resistance of the battery. The first voltage determining subunit is used for determining a second open-circuit voltage of the battery at the time interval according to the voltage and the current of the battery at the time interval and the first internal resistance value. The second internal resistance value inquiry subunit is used for inquiring a second internal resistance value of the battery at a time interval based on the second open-circuit voltage and the relation between the open-circuit voltage and the internal resistance of the battery. The second voltage determining subunit is used for determining a third open-circuit voltage of the battery at the time interval according to the voltage and the current of the battery at the time interval and the second internal resistance value.

In some embodiments, the open circuit voltage determining unit further includes: and the voltage comparison subunit is used for determining that the third open-circuit voltage is the final open-circuit voltage of the battery in the time interval when the absolute value of the difference between the third open-circuit voltage and the second open-circuit voltage is less than or equal to the first voltage threshold.

In some embodiments, the voltage comparison subunit is further configured to, when the absolute value of the difference between the third open-circuit voltage and the second open-circuit voltage is greater than the first voltage threshold, query a third internal resistance value of the battery at a time interval based on the third open-circuit voltage and a relationship between the open-circuit voltage and the internal resistance of the battery; and determining the fourth circuit voltage of the battery at the time interval according to the voltage and the current of the battery at the time interval and the third internal resistance value.

In some embodiments, the predetermined open circuit voltage comprises: a first open circuit voltage of the battery at a first time; the apparatus 60 further comprises: a first open circuit voltage determination module comprising: the device comprises an initial depth acquisition unit, an electric quantity change value determination unit, a discharge depth determination unit and an open-circuit voltage determination unit. The initial depth acquiring unit is used for acquiring the initial discharge depth of the battery at the initial moment. The electric quantity change value determination unit is used for determining a first electric quantity change value of the battery from the initial moment to the first moment. The depth of discharge determination unit is used for determining a first depth of discharge of the battery at a first moment based on the initial depth of discharge, the first electric quantity change value and the maximum rated capacity of the battery. The open-circuit voltage determining unit is used for obtaining a first open-circuit voltage based on the first discharge depth and the relation between the preset discharge depth and the open-circuit voltage.

In some embodiments, the predetermined open circuit voltage further comprises: the apparatus 60 further comprises, based on the open circuit voltage determined by the depth of discharge of the time interval preceding the time interval: other open circuit voltage determination modules, comprising: the device comprises a discharge depth obtaining unit, an electric quantity change determining unit, a discharge depth determining unit and an open-circuit voltage determining unit. The discharging depth acquiring unit is used for acquiring the discharging depth of the previous time interval. The electric quantity change value determining unit is used for determining the electric quantity change value of the battery in the previous time interval. The depth of discharge determining unit is used for determining a first depth of discharge of the battery in the time interval based on the depth of discharge of the previous time interval, the electric quantity change value in the previous time interval and the maximum rated capacity of the battery. The open-circuit voltage determining unit is used for obtaining a preset open-circuit voltage based on the first depth of discharge of the time interval and the relation between the preset depth of discharge and the open-circuit voltage.

In some embodiments, the theoretical charge determining module 604 is configured to average the charge variation values at each time interval based on a preset averaging algorithm to obtain a theoretical average charge value.

In some embodiments, the actual charge determination module 606 is configured to integrate the current of the battery over a period of time to calculate an actual average charge variation value.

In some embodiments, the apparatus 60 further comprises: and the internal short circuit judgment module is used for integrating the current of the battery in the time period so as to calculate the actual average electric quantity change value.

In the detection device for the internal short-circuit current provided by the embodiment of the disclosure, in order to detect the internal short-circuit current in a preset time period, the time period is divided into a plurality of time intervals, average electric quantity changes of the time intervals are respectively calculated, a theoretical average electric quantity change value of the time period is obtained after the average electric quantity changes of the time intervals are averaged, and then the average internal short-circuit current in the time period is jointly detected through the calculated actual electric quantity change value of the time period. By the method, the accuracy of the detection result of the short circuit in the battery is improved, and the probability of misjudgment is reduced, so that the safety problem caused by the internal short circuit of the battery in the electronic equipment can be effectively avoided.

It is noted that the block diagrams shown in the above figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

As will be appreciated by one skilled in the art, aspects of the present disclosure may be embodied as a system, method or program product. Accordingly, various aspects of the present disclosure may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.

An electronic device 800 according to this embodiment of the disclosure is described below with reference to fig. 9. The electronic device 800 shown in fig. 9 is only an example and should not bring any limitations to the functionality and scope of use of the embodiments of the present disclosure.

As shown in fig. 9, the electronic device 800 is in the form of a general purpose computing device. The components of the electronic device 800 may include, but are not limited to: the at least one processing unit 810, the at least one memory unit 820, and a bus 830 that couples the various system components including the memory unit 820 and the processing unit 810.

Wherein the storage unit stores program code that is executable by the processing unit 810 to cause the processing unit 810 to perform steps according to various exemplary embodiments of the present disclosure as described in the "exemplary methods" section above in this specification. For example, the processing unit 810 may perform a method of detecting an open-circuit voltage of a battery as shown in fig. 1 to 3, or perform a method of detecting an internal short-circuit current as shown in fig. 4 to 6.

The storage unit 820 may include readable media in the form of volatile memory units such as a random access memory unit (RAM)8201 and/or a cache memory unit 8202, and may further include a read only memory unit (ROM) 8203.

The storage unit 820 may also include a program/utility 8204 having a set (at least one) of program modules 8205, such program modules 8205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.

Bus 830 may be any of several types of bus structures including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

The electronic device 800 may also communicate with one or more external devices 700 (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 600, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 800 to communicate with one or more other computing devices. Such communication may occur via an input/output (I/O) interface 650. Also, the electronic device 800 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 860. As shown, the network adapter 860 communicates with the other modules of the electronic device 800 via the bus 830. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.

Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

In an exemplary embodiment of the present disclosure, there is also provided a computer-readable storage medium having stored thereon a program product capable of implementing the above-described method of the present specification. In some possible embodiments, various aspects of the disclosure may also be implemented in the form of a program product comprising program code for causing a terminal device to perform the steps according to various exemplary embodiments of the disclosure described in the "exemplary methods" section above of this specification, when the program product is run on the terminal device.

Referring to fig. 10, a program product 900 for implementing the above method according to an embodiment of the present disclosure is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present disclosure is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

A computer readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Program code for carrying out operations for the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).

It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.

Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.

Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A method for detecting an internal short circuit current, comprising:

sequentially determining respective average electric quantity change values of the battery at a plurality of time intervals from a first moment in the charging and discharging process of the battery;

determining a theoretical average electric quantity change value of the battery in a time period from the first moment based on the average electric quantity change value of each time interval;

calculating the actual average electric quantity change value of the battery in the time period; and

determining the average internal short-circuit current of the battery in the time period according to the theoretical electric quantity change value and the actual average electric quantity change value;

wherein the time period comprises the plurality of time intervals.

2. The method of claim 1, wherein sequentially determining respective average charge change values for the battery over a plurality of time intervals from the first time comprises:

sequentially determining a plurality of open-circuit voltages of the battery at each time interval based on a relation between a preset open-circuit voltage and the internal resistance of the battery; in the process of determining a plurality of open-circuit voltages of each time interval, when the absolute value of the difference between two adjacent determined open-circuit voltages is less than or equal to a first voltage threshold, determining the determined open-circuit voltage at the next time as the final open-circuit voltage of the battery at the time interval; and

and respectively determining the average electric quantity change value of each time interval based on the determined final open-circuit voltage of each time interval and the relationship between the preset depth of discharge and the open-circuit voltage.

3. The method of claim 2, wherein the determining the average charge variation value for each time interval based on the determined final open-circuit voltage for each time interval and the relationship between the preset depth of discharge and the open-circuit voltage comprises:

respectively obtaining the discharge depth of each time interval based on the final open-circuit voltage of each time interval and the relation between the discharge depth and the open-circuit voltage; and

and respectively determining the average electric quantity change value of the time intervals according to the discharge depth of each time interval and the maximum rated capacity of the battery.

4. The method of claim 3, wherein determining the average charge variation value for each time interval according to the depth of discharge of the time interval and the maximum rated capacity of the battery respectively comprises: respectively determining the average electric quantity change value of each time interval according to the following formula:

△Q_n＝Qmax/(T_D0D_n-T_D0D_n-1)

wherein, Delta Q_nIs the average charge variation value of the nth time interval, Qmax is the maximum rated capacity of the battery, T _ D0D_nDepth of discharge, T _ D0D, for the nth time interval_n-1Is the depth of discharge for the (n-1) th time interval.

5. The method of claim 2, wherein sequentially determining a plurality of open circuit voltages of the battery at each time interval based on a relationship between a preset open circuit voltage and an internal resistance of the battery comprises: for each time interval, the following operations are sequentially executed:

querying a first internal resistance value of the battery at the time interval based on a predetermined open circuit voltage and a relationship between the open circuit voltage and an internal resistance of the battery;

determining a second open-circuit voltage of the battery at the time interval according to the voltage and the current of the battery at the time interval and the first internal resistance value;

querying a second internal resistance value of the battery at the time interval based on the second open-circuit voltage and a relationship between the open-circuit voltage and the internal resistance of the battery; and

and determining the third open-circuit voltage of the battery in the time interval according to the voltage and the current of the battery in the time interval and the second internal resistance value.

6. The method of claim 5, wherein determining the last determined open circuit voltage as the final open circuit voltage of the battery in the time interval when the absolute value of the difference between the two adjacent determined open circuit voltages is less than or equal to the first voltage threshold comprises:

determining that the third open-circuit voltage is a final open-circuit voltage of the battery at the time interval when an absolute value of a difference between the third open-circuit voltage and the second open-circuit voltage is less than or equal to the first voltage threshold.

7. The method of claim 6, wherein sequentially determining a plurality of open circuit voltages of the battery at each time interval further comprises:

when the absolute value of the difference between the third open-circuit voltage and the second open-circuit voltage is larger than the first voltage threshold, inquiring a third internal resistance value of the battery at the time interval based on the third open-circuit voltage and the relation between the open-circuit voltage and the internal resistance of the battery; and determining the fourth circuit voltage of the battery at the time interval according to the voltage and the current of the battery at the time interval and the third internal resistance value.

8. The method of claim 5, wherein the predetermined open circuit voltage comprises: a first open circuit voltage of the battery at the first time; the method further comprises the following steps:

acquiring the initial discharge depth of the battery at the initial moment;

determining a first electric quantity change value of the battery from the initial moment to a first moment;

determining a first depth of discharge of the battery at the first time based on the initial depth of discharge, the first amount of change, and a maximum rated capacity of the battery; and

and obtaining the first open-circuit voltage based on the first discharge depth and the relation between the preset discharge depth and the open-circuit voltage.

9. The method of claim 8, wherein the predetermined open circuit voltage further comprises: the method further comprises determining an open circuit voltage based on a depth of discharge of a time interval preceding the time interval, the method further comprising:

acquiring the discharge depth of the previous time interval;

determining a charge change value of the battery in the previous time interval;

determining a first depth of discharge of the battery in the time interval based on the depth of discharge of the previous time interval, the amount of change of the electricity in the previous time interval, and the maximum rated capacity of the battery;

and obtaining the preset open-circuit voltage based on the first depth of discharge of the time interval and the relation between the preset depth of discharge and the open-circuit voltage.

10. The method of claim 1, wherein the first time is a time when the battery is in a charging or discharging steady state, the steady state comprising at least one of: the charging current or the discharging current of the battery is smaller than a first current threshold, the voltage fluctuation of the battery is smaller than a first voltage fluctuation threshold, the average current of the battery is smaller than a second current threshold within a first time threshold, and the average voltage fluctuation of the battery is smaller than a second voltage fluctuation threshold within a second time threshold.

11. The method of claim 1, wherein calculating an actual average charge change value for the battery over the period of time comprises:

and integrating the current of the battery in the time period to calculate the actual average electric quantity change value.

12. The method according to any one of claims 1-11, further comprising:

and when the internal short-circuit current is larger than an internal short-circuit current threshold value, determining that the battery has an internal short-circuit.

13. An internal short circuit current detection device, comprising:

the average electric quantity determining module is used for sequentially determining respective average electric quantity change values of the battery at a plurality of time intervals from a first moment in the charging and discharging process of the battery:

the theoretical electric quantity determining module is used for determining a theoretical average electric quantity change value of the battery in a time period from the first moment based on the average electric quantity change value of each time interval;

the actual electric quantity determining module is used for calculating an actual average electric quantity change value of the battery in the time period; and

the internal short-circuit current determining module is used for determining the average internal short-circuit current of the battery in the time period according to the theoretical electric quantity change value and the actual average electric quantity change value;

wherein the time period comprises the plurality of time intervals.

14. An electronic device, comprising: memory, processor and executable instructions stored in the memory and executable in the processor, characterized in that the processor implements the method according to any of claims 1-12 when executing the executable instructions.

15. A computer-readable storage medium having stored thereon computer-executable instructions, which when executed by a processor, implement the method of any one of claims 1-12.