WO2018196121A1 - Method and device for use in determining internal short circuit of battery - Google Patents

Abstract

An embodiment of the present invention relates to the field of electronics and provides a method and device for use in determining an internal short circuit of a battery, which may accurately and promptly determine an internal short circuit of a battery under various circumstances. The solution provided by the embodiment of the present invention comprises: measuring the open circuit voltage OCV1 and the battery temperature of a battery at time t1, obtaining a remaining capacity QOCV1 of the battery which corresponds to OCV1 at the measured battery temperature in a preset correspondence relationship, and recording an integral QCC1 of a current which flows through the battery from a time at which a system to which the battery belongs is powered on to time t1; measuring the open circuit voltage OCV2 and the battery temperature of the battery at time t2, obtaining a remaining capacity QOCV2 of the battery which corresponds to OCV2 at the measured battery temperature in the preset correspondence relationship, and recording an integral QCC2 of a current which flows through the battery from a time at which the system to which the battery belongs is powered on to time t2; calculating an internal short circuit current IISC of the battery, and if the calculated IISC is greater than or equal to a preset threshold, then determining that the battery has internally short-circuited. The present invention is used for determining whether an internal short circuit has occurred in a battery.

Description

Method and device for determining short circuit in battery

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. in.

Technical field

The present application relates to the field of electronics, and in particular, to a method and apparatus for determining a short circuit in a battery.

Background technique

With the continuous development of electronic technology, battery-powered devices are becoming more and more popular. Due to the battery in the production process, battery aging, improper use, lithium, copper, external force and other reasons, it may lead to short circuit inside the battery, which may cause thermal runaway, resulting in battery burning events. Therefore, timely detection of short circuits within the battery will effectively improve the reliability of the battery-powered device and the user experience.

The essence of the short circuit in the battery is the short-circuit resistance in which the discharge is formed inside the battery. As shown in Fig. 1, the battery model before and after the internal short circuit occurs, (a) shows a normal battery model, and (b) shows an equivalent battery model in which an internal short circuit has occurred. According to Thevenin's law of equality, from the outside of the battery model in (b) of Figure 1, the short-circuit resistance 1 of the battery is parallel with the internal resistance R of the battery. Since the internal resistance of the battery is very small, it is usually in the order of ten milliohms, even in parallel. A short-circuit resistor is also difficult to measure the short-circuit resistance, so the short-circuit resistance cannot be directly measured to determine if the battery is internally short-circuited.

Based on this, the industry proposes a method for determining the short circuit in the battery, and pre-stores the reference power required to charge the battery voltage from the first battery voltage to the second battery voltage. During the charging process, the battery voltage is cumulatively measured. The accumulated electric quantity required until the first battery voltage is charged to the second voltage is determined to be a short circuit inside the battery when the accumulated electric quantity is greater than the reference electric quantity.

However, the above-mentioned short circuit solution of the battery can only be implemented in the charging scenario, and the application scenario is limited, and the short circuit inside the battery cannot be found in time. Moreover, when the battery-powered device has other loads, the load will affect the charging current, which in turn affects the voltage and power detected during the charging process. If the load causes the battery to increase during charging, it will cause a short circuit in the battery. Therefore, the above-mentioned scheme for determining the short circuit in the battery cannot accurately determine the short circuit in the battery in each scene in time.

Summary of the invention

The embodiment of the present application provides a method and a device for determining a short circuit in a battery, so as to accurately determine a short circuit in the battery in each scene in time.

To achieve the above objective, the embodiment of the present application adopts the following technical solutions:

A first aspect, the method provides a short circuit in the battery is determined, the method specifically comprises: first measuring the battery open circuit voltage OCV t ₁ is _a time, obtaining _a predetermined correspondence between the OCV corresponding to the remaining battery charge Q _OCV1, power from the battery and records relevant to the system time t ₁ to flowing through the battery current integration Q _CC1; wherein the predetermined relationship comprises the corresponding relationship between the open-circuit voltage of the battery corresponding to the remaining power; then, the battery open circuit voltage OCV measured at time t _{2 2} , obtain the remaining battery power Q _OCV2 of the battery corresponding to OCV _{2 in the} preset correspondence relationship, and record the current integral Q _CC2 flowing through the battery from the time when the battery belongs to the system to t ₂ ; according to Q _OCV1 , Q _CC1 , Q _OCV2 , Q _{the CC2,} the battery ₁ is calculated between a time t ₂ to time t, the short-circuit power in the battery per unit time difference generated, the short circuit current of the battery I _ISC; if the computed I _ISC equal to or greater than a preset threshold, determine that Short circuit inside the battery.

The method for determining the short circuit in the battery provided by the present application utilizes the corresponding relationship between the open circuit voltage of the battery and the battery capacity, obtains the corresponding battery power change by measuring the two open circuit voltages, and the current integral change flowing through the battery during the two open circuit voltage test, Further, the current value generated by the short circuit in the battery per unit time is obtained, and when the current value is greater than or equal to the preset threshold, it is determined that the battery is internally short-circuited. The implementation of the scheme has no limitation on the scene in which the battery is located, and due to the accurate correspondence between the open circuit voltage and the battery capacity, it is possible to accurately determine the short circuit inside the battery in various scenarios, and facilitate battery management.

It should be noted that the time t _{1 and the} time t _{2 are the} times at which the battery open circuit voltage can be measured, and the time t ₂ is later than the time t ₁ on the time axis.

In combination with the first aspect, in a possible implementation manner, according to Q _OCV1 , Q _CC1 , Q _OCV2 , Q _CC2 , the amount of power generated by the short circuit in the battery per unit time between time t _{1 and} time t _{2 is} calculated. Poor, as the internal short-circuit current I _{ISC of the} battery, can be realized as: calculation

In combination with the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the preset correspondence may include a correspondence between an open circuit voltage of the battery and a remaining power at different battery temperatures. At this time, the method for determining the short circuit in the battery provided by the embodiment of the present application may further include: acquiring the temperature T _{1 of the} battery at time t ₁ before acquiring the remaining power quantity Q _OCV1 of the battery corresponding to the OCV ₁ in the preset correspondence relationship; Correspondingly, obtaining the remaining battery power Q _OCV1 of the battery corresponding to the OCV _{1 in the} preset correspondence relationship includes: acquiring the remaining battery power Q _OCV1 of the battery corresponding to the OCV ₁ at the temperature T ₁ in the preset correspondence relationship. For the same reason, the method for determining the short circuit in the battery provided by the embodiment of the present application may further include: acquiring the temperature T _{2 of the} battery at time t ₂ before acquiring the remaining power Q _OCV2 of the battery corresponding to the OCV ₂ in the preset correspondence relationship. Correspondingly, obtaining the remaining battery power Q _OCV2 of the battery corresponding to the OCV _{2 in the} preset correspondence relationship includes: obtaining the remaining battery power Q _OCV2 of the battery corresponding to the OCV ₂ at the temperature T ₂ in the preset correspondence relationship. The correspondence between the open circuit voltage, the battery temperature and the battery capacity is applied to determine the short circuit in the battery, and the accuracy of the solution is improved.

With the first aspect or any of the above possible implementation, in one possible implementation, t is time and the _second time interval time t ₁ t ₂ -t _1, is greater than or equal to a first predetermined time interval. It ensures that the power difference caused by the short-circuit current in the battery is accumulated to improve the calculation accuracy.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, if the remaining power included in the preset correspondence relationship is the remaining battery power percentage SOC, the remaining battery power of the OCV _{1 is} Q _OCV1 = SOC _OCV1 *FCC, OCV ₂ corresponds to the remaining battery capacity Q _OCV2 =SOC _OCV2 *FCC; where FCC can be the theoretical rated full charge of the battery; or, FCC is the current rated full charge of the battery. Wherein, when the FCC is the current rated full charge of the battery, the initial value of the FCC is the theoretical rated full charge of the battery of the battery, and as the battery ages, the rated full capacity of the battery is gradually reduced, and the capacity can be self-learned. The method is to get the current rated full charge of the battery in real time as the FCC.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, the time t ₁ or the time t _{2 is a} time when the battery is in an equilibrium state; the balanced state includes a current flowing through the battery per unit time The duration less than or equal to the preset current threshold is greater than or equal to the second preset time interval. The battery is in equilibrium with the battery open circuit, and the open circuit voltage can be measured at this time, which ensures the implementability of the solution of the present application.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, before obtaining the remaining power quantity Q _OCV1 of the battery corresponding to the OCV ₁ in the preset correspondence relationship, the present application provides determining the internal short circuit of the battery. The method may further include: after the battery is fully charged and stabilized at different test temperatures, the open circuit voltage corresponding to the different remaining power of the battery is tested to form a preset correspondence relationship. Among them, the different remaining power of the battery can be achieved by stepping discharge. The preset correspondence is obtained in advance to ensure the real-time performance of the solution of the present application.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, measuring the open circuit voltage OCV _{1 of the} battery at time t ₁ may specifically include: after the battery is stabilized, measuring the battery at time t ₁ Open circuit voltage OCV ₁ . Measuring the open circuit voltage OCV of the battery at the time t _{2 2,} specifically comprising: After stabilizing the battery, the battery open circuit voltage OCV measured at time t _{2 2.} After the battery is stabilized, the parameters tend to be stable, which ensures the effectiveness and accuracy of the implementation.

In combination with the first aspect or any of the foregoing possible implementation manners, in one possible implementation manner, the definitions of battery stability are different in different scenarios. Several types of battery stability are defined as follows: If the battery is in a charged state, the battery stability may include: the battery voltage is greater than or equal to the linear threshold, waiting for the battery to stop charging, keeping the charger powered to the system, and isolating the battery, waiting The third preset time interval. If the battery is in a non-charging state, the battery stabilization may specifically include: setting a fourth preset time interval. If the battery-powered system is in the standby state, the battery stability may include: after the system is woken up, the time difference between the current time and the system entering the standby state is greater than or equal to the fifth preset time interval.

With reference to the first aspect or any of the foregoing possible implementation manners, in a possible implementation manner, if the preset correspondence relationship includes the corresponding relationship between the open circuit voltage of the battery and the remaining power at different battery temperatures, the battery is calculated. Before the internal short circuit current I _ISC , the method for determining the short circuit in the battery provided by the present application may further include: determining whether the temperature difference of the battery is less than or equal to the temperature threshold at time t _{2 and} time t ₁ . Calculate the battery internal short-circuit current I _ISC, specifically comprises: when the temperature difference between the time t ₂ and time t ₁ is less than or equal to the battery temperature threshold, the battery is calculated in the short-circuit current I _ISC. If the temperature difference between the battery at time t _{2 and} time t ₁ is greater than the temperature threshold, the time t ₂ is taken as the time t ₁ , and the parameter assignment for calculating the internal short-circuit current I _ISC of the battery is recorded. After the battery is stabilized, the next time is The time at which the open circuit voltage is measured is taken as the time t ₂ , and the solution of the embodiment of the present application is re-executed. The battery temperature variation during the execution of the solution of the present application is guaranteed to be within a certain range to improve the accuracy of the results of the present application.

In a second aspect, an apparatus for determining a short circuit within a battery is provided, the apparatus comprising a voltage measuring unit, a calculation and processing unit, and a current integration measuring unit. The voltage measuring unit is configured to measure an open circuit voltage of the battery at different times; the calculating and processing unit is configured to obtain a remaining power of the battery corresponding to each open circuit voltage measured by the voltage measuring unit in the preset correspondence relationship; wherein, the preset corresponding The relationship includes the correspondence between the open circuit voltage of the battery and the remaining power; the current integral measuring unit is used for measuring the current integral flowing through the battery at each time from the start of the system to which the battery belongs to the voltage measuring unit to measure the open circuit voltage; the calculation and processing unit also uses According to Q _OCV1 , Q _CC1 , Q _OCV2 , Q _CC2 , calculate the difference in the amount of electricity generated by the short circuit in the battery between time t _{1 and} time t ₂ , as the internal short circuit current I _{ISC of the} battery; Q _OCV1 and Q _OCV2 are the remaining battery power of the open circuit voltages OCV ₁ and OCV ₂ of the battery measured by the voltage measuring unit at time t _{1 and} time t ₂ ; Q _CC1 and Q _CC2 are current integral measurements. a recording unit measures power from the battery of the system belongs to time t _1, t ₂ time flowing through the battery current integration; with calculation and processing unit further _Therefore , if the I _{ISC is} greater than or equal to the preset threshold, it is determined that the battery is short-circuited.

With reference to the second aspect, in a possible implementation manner, the calculation and processing unit calculates, according to Q _OCV1 , Q _CC1 , Q _OCV2 , and Q _CC2 , the battery is short-circuited within a unit time between time t _{1 and} time t ₂ . The generated electric quantity difference, as the internal short-circuit current I _{ISC of the} battery, can be realized as: calculation

In combination with the second aspect, in a possible implementation, the current integration measurement unit may include a current measurement module and an integration module. The current measuring module is used to measure the current flowing through the battery; the integrating module is used to integrate the current measured by the current measuring module.

It should be noted that the specific implementation of the apparatus for determining the short circuit in the battery provided by the second aspect is the same as the specific implementation of the method for determining the short circuit in the battery provided by the first aspect, and details are not described herein again.

In a third aspect, a device for determining a short circuit in a battery is provided. The device for determining a short circuit in the battery can implement the functions in the above method example, and the function can be implemented by hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

With reference to the third aspect, in a possible implementation manner, the apparatus for determining a short circuit in a battery includes a processor and a collector configured to support the device for determining a short circuit in the battery to perform the corresponding method in the foregoing method The function. The collector is configured to support the parameter of the battery collection device that determines the short circuit in the battery. The means for determining a short circuit within the battery can also include a memory for coupling with the processor that retains the program instructions and data necessary to determine the short circuit within the battery.

In a fourth aspect, an embodiment of the present application provides a computer storage medium for storing computer software instructions for use in determining the short circuit in a battery, which includes a program designed to perform the above aspects.

The solution provided by the foregoing second to fourth aspects is used to implement the method for determining the short circuit in the battery provided by the above first aspect, and thus the same beneficial effects can be achieved as the first aspect, and details are not described herein.

DRAWINGS

1 is a schematic diagram of a battery model provided by the prior art;

FIG. 1a is a schematic structural diagram of a battery working scene architecture provided by the prior art; FIG.

2 is a schematic structural diagram of an apparatus for determining a short circuit in a battery according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a battery working scenario architecture according to an embodiment of the present disclosure;

4 is a schematic flow chart of a method for determining a short circuit in a battery according to an embodiment of the present application;

4a is a schematic flow chart of another method for determining a short circuit in a battery according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an internal architecture of a charging chip for sub-path management according to an embodiment of the present application; FIG.

6 is a schematic flow chart of another method for determining a short circuit in a battery according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a device and a battery connection structure for determining a short circuit in a battery according to an embodiment of the present application;

FIG. 9 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present application;

FIG. 11 is a schematic diagram of another connection structure of a device for determining a short circuit in a battery according to an embodiment of the present application;

FIG. 12 is a schematic structural diagram of another apparatus for determining a short circuit in a battery according to an embodiment of the present application.

detailed description

At present, the application of the battery is getting higher and higher, but the phenomenon of short circuit inside the battery cannot be avoided. The internal short circuit of the battery will cause irreparable damage to the system powered by the battery. Therefore, it is particularly important to determine the short circuit inside the battery in time. As described in the background art, the current method for determining the short circuit in the battery is to compare the accumulated electric quantity of the charging with the theoretical reference electric quantity during the charging process of the battery, which is easy to cause misjudgment and the judgment is inaccurate.

Since the nature of the short circuit inside the battery is that the discharge resistance is formed inside the battery, the power of the battery does not match the remaining power, and the remaining power of the battery can accurately correspond to the open circuit voltage of the battery. Based on this, the basic principle of the application is: the remaining power of the battery The open circuit voltage of the battery can be accurately matched. By measuring the open circuit voltage of the battery, the amount of change of the remaining power during the operation of the battery is obtained, and the difference between the change amount and the accumulated power of the flow battery during the operation of the battery is calculated and divided by the time, that is, The current formed by the internal short circuit can be obtained. If the current exists and is greater than the threshold, it can be determined that the battery is internally short-circuited. If the current is less than the preset threshold, it is determined that the battery does not have an internal short circuit. The entire determination process utilizes the acquisition parameters of the battery and is not limited by the battery scene, thereby accurately determining the short circuit in the battery under various scenarios.

It should be noted that the battery described in the present application can be a power supply battery in any system that is powered by a battery in the electronic field. The system described herein may include, but is not limited to, a terminal, power steam Car and so on. The terminal is the mobile communication device used by the user. The terminal can be a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), an e-book, a mobile TV, a wearable device, a personal computer ( Personal Computer, PC) and more. The embodiment of the present application does not specifically limit the type of the terminal.

The method for determining a short circuit in a battery provided by the present application is applied to the battery working scene architecture as shown in FIG. 1a. As shown in FIG. 1a, the architecture includes a battery 101, a charging module 102, an external charger 103, and a system 104 powered by the battery 101. Among them, the battery 101 includes a battery cell 1011.

It should be noted that FIG. 1a merely illustrates the architecture of the battery working scenario by way of example, and is not limiting. The embodiment of the present application does not specifically limit the performance of the battery 101, such as the type and capacity. The type of the system 104 for powering the battery 101 is not specifically limited in the embodiment of the present application. In practical applications, some battery operating architectures also include protection circuits, as shown in Figure 1a.

The embodiments of the present application are specifically described below in conjunction with the accompanying drawings.

In one aspect, an embodiment of the present application provides an apparatus for determining a short circuit within a battery. 2 shows an apparatus 20 for determining a short circuit within a battery associated with various embodiments of the present application. The device 20 for determining a short circuit within the battery can be coupled to the battery 101 in the battery operating scene architecture shown in FIG. 1a for determining if the battery 101 is internally shorted. Figure 3 illustrates that the device 20 for determining a short circuit within the battery is used in the battery operating scenario architecture illustrated in Figure 1a, in connection with the battery 101.

As shown in FIG. 2, the apparatus 20 for determining a short circuit within the battery may include a processor 201, a memory 202, and a collector 203. The specific components of the device 20 for determining the short circuit in the battery will be specifically described below with reference to FIG. 2:

The memory 202 may be a volatile memory such as a random-access memory (RAM) or a non-volatile memory such as a read-only memory. , ROM), flash memory, hard disk drive (HDD) or solid-state drive (SSD); or a combination of the above types of memory for storing a program that implements the method of the present application Code, data, and configuration files.

The processor 201 is a control center of the device 20 for determining a short circuit in the battery, and may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or configured to be implemented. One or more integrated circuits of the embodiments of the present application, for example, one or more digital singular processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs). The processor 201 can perform various functions of the device 20 for determining a short circuit within the battery by running or executing a software program and/or module stored in the memory 202, and recalling data stored in the memory 202.

The collector 203 is used to collect parameters of the battery connected to the device 20 that determines the short circuit within the battery, and is provided to the device 20 that determines the short circuit within the battery to support the device 20 that determines the short circuit within the battery to perform various functions. Exemplarily, the collector 203 can collect the open circuit voltage of the battery, the current integral flowing through the battery, The temperature of the battery.

It should be noted that, when the collector 203 collects different parameters, the specific implementation manner is different, and the embodiment of the present application does not specifically limit this.

Exemplarily, when the collector 203 is used to collect the temperature of the battery, the collector 203 can be implemented by a temperature sensor, and the temperature sensor can pass a positive temperature coefficient (PTC) thermistor and a negative temperature coefficient (Negative Temperature Coefficient). , NTC) Thermistors, thermocouples and other temperature measuring device devices and their auxiliary circuits are implemented. When the collector 203 is used to collect the open circuit voltage of the battery, the measurement can be realized by using an analog to digital converter (ADC). When the collector 203 is used to collect the current integral flowing through the battery, the sampling resistor can be connected in series to any pole of the battery, and the voltage across the battery can be calculated by the voltage measured by the ADC to calculate the current flowing through the battery, and then the current is passed through the integrating circuit. Cumulative current integration is obtained. Among them, the integration circuit can be implemented by a coulomb counter.

It should be noted that the foregoing specific implementation of the collector 203 is merely an example and is not specifically limited to the implementation manner of the collector 203. In a practical application, the specific implementation of the configuration 203 can be configured according to the actual requirements, and the acquisition processor 201 determines the parameters of the battery required when the battery is short-circuited.

The processor 201 performs the following functions by running or executing a software program and/or module stored in the memory 202, and calling data stored in the memory 202:

The open circuit voltage OCV _{1 of the} battery at time t _{1 is} measured by the collector 203, and the remaining power Q _OCV1 of the battery corresponding to the OCV _{1 in the} preset correspondence is _obtained , and the collector 203 collects and records the flow from the system to the time t _{1 of the} battery. by the battery current integration Q _CC1; wherein the preset corresponding relation comprises a battery open circuit voltage and the remaining power; measured by collecting cell ₂ 203, acquires open circuit voltage OCV t ₂ time preset correspondence between the OCV ₂ The remaining battery power Q _{OCV2 of the} corresponding battery is recorded by the collector 203 from the current integration Q _CC2 flowing through the battery from the system to which the battery belongs to the time t ₂ ; according to Q _OCV1 , Q _CC1 , Q _OCV2 , Q _CC2 , the battery is calculated at t ₁ The time difference between the time and the time t ₂ , the short circuit caused by the short circuit in the battery per unit time, as the internal short circuit current I _{ISC of the} battery; if the I _{ISC is} greater than or equal to the preset threshold, the short circuit in the battery is determined.

On the other hand, an embodiment of the present application provides a method for determining a short circuit in a battery, which is applied to a device for determining a short circuit in a battery, for determining whether an internal short circuit occurs in a battery connected to a device for determining a short circuit in the battery. As shown in FIG. 4, the method may include:

S401, determining the short-circuiting means for measuring the battery cell open circuit voltage of the OCV at the time t _{1 1,} obtaining _a preset correspondence relationship between the OCV corresponding to the remaining battery charge Q _OCV1, records relevant to the system power from the battery through the battery to time t ₁ The current is integrated into Q _CC1 .

The preset correspondence may include a correspondence between an open circuit voltage of the battery and a remaining power. After obtaining the open circuit voltage of the battery at a certain time, by querying the preset correspondence, the remaining battery power corresponding to the open circuit voltage can be obtained.

Optionally, in the preset correspondence, the remaining power of the battery included may be the absolute value Q of the remaining power, or may be the remaining SOC of the power, which is not specifically limited in this embodiment of the present application.

Specifically, when the preset battery is included in the preset correspondence, the remaining power of the battery is the absolute value of the remaining battery Q. When the remaining power corresponding to the open circuit voltage is obtained, the preset correspondence relationship is obtained. When the remaining power of the battery included in the preset correspondence is the remaining battery percentage SOC, the remaining power corresponding to the open circuit voltage is first read to obtain the remaining percentage SOC of the power, and then multiplied by the FCC to obtain the remaining battery power. Wherein, the FCC is the theoretical rated full charge of the battery; or, the FCC is the current rated full charge of the battery.

Further, when the FCC is the theoretical rated full charge of the battery, the FCC is a fixed value that does not change, determined by the initial performance of the battery, and the rated nominal parameter of the battery. When the FCC is the current rated full charge of the battery, the FCC changes according to the performance of the battery. The initial value is the theoretical rated full charge of the battery. As the battery ages, the rated full capacity will gradually decrease. The method obtains the full capacity of the battery under different aging procedures and records, and the current rated full power of the battery is the full capacity of the newly recorded battery.

It should be noted that the content of the method for capacity self-learning is not specifically limited in the embodiment of the present application, and may be selected according to actual needs. Any method that can be used to learn the latest full power of the battery can be used as the capacity described herein. study method.

Based on this, when the remaining power of the battery included in the preset correspondence is the remaining battery percentage SOC, in S401, the remaining power of the battery corresponding to OCV _{1 is} Q _OCV1 = SOC _OCV1 *FCC, and SOC _OCV1 is a preset correspondence. Medium, the percentage of battery remaining capacity corresponding to OCV ₁ .

Optionally, the content in the preset correspondence relationship may be configured according to actual requirements, and the preset correspondence relationship may include only the correspondence between the open circuit voltage of the battery and the remaining power, as shown in Table 1 below. Alternatively, the preset correspondence may include a correspondence between the open circuit voltage of the battery and the remaining power at different battery temperatures, as shown in Table 2 below. For the preset correspondence, the content shown in Table 1 or the content shown in Table 2 may be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.

Exemplarily, when the temperature in the battery application scenario is stable, in order to simplify the content of the preset correspondence, the preset correspondence may only include the correspondence between the open circuit voltage of the battery and the remaining power. When the application scenario of the battery is complicated, the temperature is variable, and the open circuit voltage of the battery has a different correspondence with the remaining power at different temperatures, the preset correspondence may include the open circuit voltage and the remaining power of the battery under different battery temperatures. Correspondence. Of course, the example here is only an example to describe the content of the preset correspondence, and is not limited thereto.

Table 1

Open circuit voltage (volts)	remaining battery
4.35	100%
4.15	90%
3.95	80%
......	......

Table 2

It should be noted that Tables 1 and 2 only illustrate the content of the preset correspondence by way of example, and are not limited to the content and form of the preset correspondence. In practical applications, preset correspondences such as graphs or fitting formulas may be stored using content other than the table. Moreover, in practical applications, the content in the preset correspondence can be generated according to actual measurements. The remaining power included in the preset correspondences shown in Table 1 and Table 2 is the percentage of the remaining power. The example is not limited. As mentioned above, the remaining power included in the preset correspondence may also be the absolute value of the remaining battery power. .

Further, when the preset correspondence includes the corresponding relationship between the open circuit voltage of the battery and the remaining power at different battery temperatures, as shown in FIG. 4a, the remaining power of the battery corresponding to the OCV ₁ in the preset correspondence is obtained in S401. The method for determining the short circuit in the battery provided by the embodiment of the present application before the Q _OCV1 may further include S401a.

S401a, the battery short-circuit determination means acquires the temperature of the battery at the time t ₁ T _1.

It should be noted that the S401a and the S401 may be executed at the same time, or may be performed in succession. The embodiment of the present application does not specifically limit this. The figure only illustrates the execution order of S401a and S401, but it is not specific to this. limited.

Correspondingly, the remaining power quantity Q _OCV1 of the battery corresponding to the OCV ₁ in the preset correspondence relationship is obtained in S401, including: acquiring the remaining power quantity Q _OCV1 of the battery corresponding to the OCV ₁ at the temperature T ₁ in the preset correspondence relationship.

It should be noted that the content included in the preset correspondence relationship is usually obtained by interpolation. Therefore, the measured open circuit voltage value may not be included in the preset correspondence relationship. In this case, the preset correspondence relationship may be obtained. The measured open circuit voltage value is close to the remaining power corresponding to the two open circuit voltage values, and then the remaining power corresponding to the measured open circuit voltage is obtained in equal proportion.

Similarly, the preset correspondence relationship may not include the corresponding relationship between the open circuit voltage of the battery and the remaining power at the measured battery temperature. At this time, the measured battery temperature may be obtained in the preset correspondence relationship before and after the temperature is close to two temperatures. The remaining power of the open circuit voltage value is equal to the measured value. The remaining power corresponding to the open circuit voltage at the battery temperature.

Further, the time t _{1 of} measuring the open circuit voltage is the time when the battery is in the equilibrium state. When the battery is in the equilibrium state, the battery is equivalent to the open circuit state, and at this time, the open circuit voltage can be directly measured. Defining the balance state of the battery includes a duration in which the current flowing through the battery per unit time is less than or equal to a preset current threshold, greater than or equal to a second predetermined time interval.

It should be noted that the preset current threshold and the duration of the second preset time interval may be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.

Illustratively, S401 can be implemented by the collector 203 in the apparatus for determining a short circuit within the battery illustrated in FIG. In S401, measuring the open circuit voltage of the battery can be measured by an ADC. The current integral flowing through the battery is measured, and the current flowing through the battery can be calculated by connecting the voltage across the battery through the resistance of the ADC, and the current is integrated after being accumulated.

S402, determining the short-circuiting means for measuring the battery cell open circuit voltage of the OCV time t _{2 2,} obtaining a preset correspondence relationship between the OCV ₂ corresponding to the remaining battery charge Q _OCV2, records relevant to the system to boot from the battery through the battery time t ₂ The current is integrated into Q _CC2 .

It should be noted that the execution process of S402 is the same as the execution process of S401, but the execution time is different. The specific implementation process has been described in detail in S401, and will not be described again here.

Similar to S401, when the preset correspondence includes the corresponding relationship between the open circuit voltage of the battery and the remaining power at different battery temperatures, as shown in FIG. 4a, the battery corresponding to the OCV ₂ in the preset correspondence is acquired in S402. the method of the remaining amount Q _OCV2, determining the short circuit of the battery according to this embodiment may further include application S401a.

S402a, the battery short-circuit determination means acquires the temperature of the battery at the time t ₂ T _2.

It should be noted that the S402a and the S402 may be executed at the same time, or may be performed sequentially. This embodiment of the present application does not specifically limit this. The figure only illustrates the execution order of S402a and S402, but it is not specific to this. limited.

Correspondingly, the remaining power quantity Q _OCV2 of the battery corresponding to the OCV ₂ in the preset correspondence relationship is obtained in S402, including: acquiring the remaining power quantity Q _OCV2 of the battery corresponding to the OCV ₂ at the temperature T ₂ in the preset correspondence relationship.

Further, the time t _{2 of} measuring the open circuit voltage is the time when the battery is in the equilibrium state. When the battery is in the equilibrium state, the battery is equivalent to the open circuit state, and at this time, the open circuit voltage can be directly measured.

It should be noted that the time t _{1 and the} time t ₂ may be the time when the battery open circuit voltage can be measured twice in succession, or the time when the battery open circuit voltage can be measured in two consecutive times, which is not specifically described in this embodiment of the present application. limited. As long as the time t _{2 is after the} time t ₁ .

Optionally, the time interval t ₂ -t _{1 of} performing S402 and executing S401 is greater than or equal to the first preset time interval, so that the power accumulation is obvious, and the accuracy of the calculation is ensured.

It should be noted that the first preset time interval may be configured according to actual requirements, which is not specifically limited in this embodiment of the present application. Optionally, the first preset time interval may be half an hour or one hour.

S403, determining the short circuit within the battery apparatus according to _{Q OCV1, Q CC1, Q OCV2} , Q CC2, the battery is calculated at time t ₁ between ₂ to time t, the power within the battery short unit time difference generated as the battery Short circuit current I _ISC .

Specifically, it can be calculated in S403.

Where Q _OCV1 -Q _OCV2 represents the amount of change in the remaining capacity of the battery between time t _{1 and} time t ₂ , and in the discharge scenario, the amount of change in the remaining capacity of the battery between time t _{1 and} time t ₂ is a decrease amount, Q _OCV1 -Q _OCV2 is a positive value. In the charging scenario, the amount of change in battery residual capacity between time t _{1 and} time t ₂ is an increase, Q _OCV1 -Q _OCV2 is a negative value; Q _CC2 -Q _CC1 indicates time t ₁ to time t ₂ between the total amount of electricity of the battery outward, a scene in the discharge time t ₁ to time t ₂ between the total amount of electricity in the battery to increase the amount of outward, Q _CC2 -Q _CC1 is a positive value In the charging scenario, the total amount of power supplied by the battery between t ₁ and t ₂ is the amount of reduction, Q _CC2 -Q _CC1 is a negative value; the difference between Q _OCV1 -Q _OCV2 and Q _CC2 -Q _CC1 The amount of discharge of the internal short-circuit resistance in the presence of an internal short circuit.

Optionally, when the battery is in a discharge scenario, Q _OCV1 -Q _{OCV2 is} greater than or equal to Q _CC2 -Q _CC1 , and when the battery is in a charging scenario, Q _OCV1 -Q _{OCV2 is} less than or equal to Q _CC2 -Q _CC1 . Theoretically, when the battery does not have an internal short circuit, the difference between the two is less than the preset threshold. When the battery is internally short-circuited, the difference between the two is greater than or equal to the preset threshold. The difference between the two is divided by the time difference from the time t _{1 to the} time t ₂ , and the current caused by the internal short circuit is obtained.

The following describes the process of calculating the internal short-circuit current I _ISC of the battery by taking the discharge scene and the charging scene as an example.

Exemplary, Table 1 illustrates an example of the preset correspondence relation, the discharge scenario, suppose time t ₁ cell OCV1 = 4.15V, corresponding to a percentage of battery capacity SOC _OCV1 = 90%, power measuring system to T ₁ The current integral flowing through the battery is Q _CC1 =700 mAh (milli ampere/hours, mAH). After 1 hour, after charging and standing, the OCV2=3.95V of the battery at time t ₂ , the corresponding battery capacity percentage is SOC _OCV2 = 80%, the measured system current is connected to the current integral of the battery at time t ₂ Q _CC2 = 780mAH, assuming the battery's FCC = 1000mAH, the internal short-circuit current I _ISC = ((90% - 80%) can be calculated *1000-(780-700)) / 1 = 20 mA (milli ampere, mA).

Exemplary, Table 1 illustrates an example of the preset correspondence relation, the charging scenario, suppose time t ₁ cell OCV1 = 3.95V, corresponding to a percentage of battery capacity SOC _OCV1 = 80%, power measuring system to T ₁ The current integral flowing through the battery is Q _CC1 =800mAH. After 1 hour, after charging and standing, the OCV2=4.15V of the battery at time t ₂ , the corresponding battery capacity percentage is SOC _OCV2 =90%, and the measured system is turned on. The current integral Q _CC2 = 650mAH flowing through the battery at time t ₂ , assuming the FCC of the battery is 1000mAH, the internal short-circuit current I _ISC = ((80%-90%)*1000-(650-800))/1 can be calculated. =50mA.

S404. If I _{ISC is} greater than or equal to a preset threshold, the device for determining a short circuit in the battery determines a short circuit in the battery.

The preset threshold can be configured according to actual requirements, which is not specifically limited in this application. Exemplarily, if the battery-powered system is a mobile phone, the preset threshold can be configured to be small, for example, a few milliamps; if the battery-powered system is a vehicle, the preset threshold can be configured to be large, for example, several tens of milliamps; The value is determined according to actual needs.

Specifically, although the difference between SOC _OCV1 -SOC _OCV2 and Q _CC2 -Q _CC1 is 0 when the battery does not have an internal short circuit under absolute ideal conditions, in order to avoid other interference, the preset threshold is determined to increase the present The accuracy of the program to avoid misjudgment.

Optionally, if it is determined in S404 that I _{ISC is} less than a preset threshold, it is determined that the battery does not have an internal short circuit at this time. In this case, after S404, the battery may be a steady state at a next time t _1, S401 to S404 process re-executed, it is determined whether the battery short-circuited. Alternatively, after S404, time t ₂ may be used as time t _1, the time t ₂ the parameter acquired in S402 as a time t ₁ acquired in S401, S404 and then the next cell after the time t ₂ as the steady state, re-run The process of S402 to S404 determines whether the battery has an internal short circuit.

The method for determining the short circuit in the battery provided by the present application utilizes the corresponding relationship between the open circuit voltage of the battery and the battery capacity, obtains the corresponding battery power change by measuring the two open circuit voltages, and the current integral change flowing through the battery during the two open circuit voltage test, Further, the current value generated by the short circuit in the battery per unit time is obtained, and when the current value is greater than or equal to the preset threshold, it is determined that the battery is internally short-circuited. The implementation of the scheme has no limitation on the scene in which the battery is located, and due to the accurate correspondence between the open circuit voltage and the battery capacity, it is possible to accurately determine the short circuit inside the battery in various scenarios, and facilitate battery management.

It should be noted that the method for determining a short circuit in a battery provided by the embodiment of the present application is used to evaluate whether an internal short circuit occurs in a battery in a battery charging state, a battery full state, a battery discharging state, a battery discharging standby state, and the like. The method for determining the short circuit in the battery provided by the embodiment of the present application is not affected by the state of the battery.

Optionally, in order to improve the implementation stability of the solution in this application, the open circuit voltage OCV _{1 of the} battery at time t ₁ is measured in S401, and specifically, after the battery is stabilized, the open circuit voltage OCV _{1 of the} battery at time t _{1 is} measured. . The open circuit voltage OCV _{2 of the} battery at time t ₂ is measured in S402, and specifically, after the battery is stabilized, the open circuit voltage OCV _{2 of the} battery at time t _{2 is} measured.

For the definition of the battery stability, it can be configured according to actual requirements, which is not specifically limited in this embodiment of the present application. The following example describes a definition of battery stability that is concentrated, but is not specifically limited to the definition of battery stability.

Exemplarily, if the battery is in a charging state, the battery stability is defined as: the battery voltage is greater than or equal to the linear threshold, the battery is stopped, the charger is powered to the system, and the battery is isolated, waiting for a third preset time interval.

Illustratively, Figure 5 illustrates the internal architecture of a conventional sub-path managed charging chip that charges the battery while powering the system. When the battery is fully charged, you can control the switch in the figure below to turn off the battery, or to disconnect the battery during the charging process.

Exemplarily, if the battery is in a non-charging state, the battery stability is defined as: resting for a fourth preset time interval. The non-charging state may include a full-stand state, that is, a charging completion state.

Exemplarily, if the battery-powered system is in the standby state, that is, the discharge standby state, the battery stability is defined as: the time difference between the current time and the system entering the standby state after the system is woken up is greater than or equal to the fifth preset time interval.

It should be noted that the linear threshold, the third preset time interval, the fourth preset time interval, and the fifth preset time interval may be configured according to actual requirements, and the embodiment of the present application does not specifically limited.

Further, as shown in FIG. 6 , on the basis of the method for determining the short circuit in the battery illustrated in FIG. 5 or FIG. 4 , the method for determining the short circuit in the battery provided by the embodiment of the present application may further include S405. It should be noted that, in FIG. 6 of the embodiment of the present application, only the basis of FIG. 5 is used, but the specific method for determining the short circuit in the battery provided by the embodiment of the present application is not specifically limited. The steps further included in FIG. 6 compared to FIG. 5 may also be included on the basis of the method for determining the short circuit in the battery illustrated in FIG. 4, and will not be further described herein.

S405. Construct a preset correspondence.

Optionally, the preset correspondence is established in S405, which may be performed in a laboratory measurement, or may be performed in a battery operation process by machine learning, which is not specifically limited in this embodiment of the present application.

Exemplarily, a process for constructing a preset correspondence relationship is provided, including: after the battery is fully charged and stabilized at different test temperatures, the open circuit voltage corresponding to different remaining powers of the battery is tested to form a preset correspondence relationship. The description here is a construction process in which the preset correspondence includes the correspondence between the open circuit voltage of the battery and the remaining power at different temperatures. When the preset correspondence only includes the correspondence between the open circuit voltage of the battery and the remaining power, after the battery is fully charged, the open circuit voltage corresponding to the different remaining power of the battery is tested at a predetermined temperature to form a preset correspondence. The predetermined temperature may be determined according to actual requirements, which is not specifically limited in this embodiment of the present application.

Exemplarily, the following describes, by way of example, a process of obtaining a correspondence between the open circuit voltage of the battery and the remaining power at a certain temperature: at this temperature, the battery is fully charged, and at this temperature, after the standstill, the remaining power is 100 at this time. %, measure the open circuit voltage at this time; then discharge 5%, test the battery open circuit voltage when the remaining charge is 95%; repeat this until the battery charge is zero. In this way, the corresponding relationship between the open circuit voltage of the battery and the remaining power at this temperature is obtained.

Further, if the preset correspondence includes the corresponding relationship between the open circuit voltage of the battery and the remaining power at different battery temperatures, and based on the method for determining the short circuit in the battery illustrated in FIG. 5, the determining battery provided by the embodiment of the present application The method of the inner short circuit may further include S406 before S403.

S406. The device for determining a short circuit in the battery determines whether the temperature difference between the battery at time t _{2 and} time t ₁ is less than or equal to a temperature threshold.

The temperature threshold is used to control the temperature range of the battery during the two sampling processes when implementing the embodiment of the present application. The value of the temperature threshold can be configured according to actual requirements, which is not specifically limited in this embodiment of the present application.

Specifically, if it is determined in S406 that the temperature difference of the battery is less than or equal to the temperature threshold at time t _{2 and} time t ₁ , then the internal short-circuit current I _{ISC of the} battery is calculated in S403.

Optionally, if the time t _{2 and the} time t _{1 are} determined in S406, the temperature difference of the battery is greater than the temperature threshold. After S406, the battery may be a steady state at a next time t _1, S401 to S404 process re-executed, it is determined whether the battery short-circuited. Alternatively, after S406, time t ₂ may be used as time t _1, the time t ₂ S402 is acquired at time t ₁ as a parameter acquired in S401, S406 and then the next cell after the time t ₂ as the steady state, re-run The process of S402 to S404 determines whether the battery has an internal short circuit.

The above is mainly from the perspective of the working process of the device for determining the short circuit in the battery. The solution was introduced. It will be appreciated that the means for determining a short circuit within the battery, in order to carry out the above-described functions, comprise corresponding hardware structures and/or software modules for performing the respective functions. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

The embodiment of the present application may perform the division of the function module on the device for determining the short circuit in the battery according to the above method example. For example, each function module may be divided according to each function, or two or more functions may be integrated into one processing module. . The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.

In the case where the respective functional modules are divided by corresponding functions, FIG. 7 shows a possible structural diagram of the apparatus for determining the short circuit in the battery involved in the above embodiment. The means 70 for determining a short circuit within the battery may include a voltage measuring unit 701, a calculation and processing unit 702, and a current integral measuring unit 703. Wherein, the voltage measuring unit 701, the calculating and processing unit 702, and the current integral measuring unit 703 acquiring unit 601 for supporting the determining of the short circuit in the battery performs the processes S401, S402 in FIG. 4 or FIG. 4a or FIG. 6; calculating and processing Unit 70 is operative to support apparatus 70 for determining a short circuit within the battery to perform processes S403 and S404 of FIG. 4 or FIG. 4a or FIG. All the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

Illustratively, Figure 8 illustrates an architecture for determining the connection of device 70 to a battery within a battery. The operation of the apparatus 70 for determining a short circuit within the battery is described in conjunction with FIG. As shown in FIG. 8, one end of the voltage measuring unit 701 is connected to the battery for measuring the open circuit voltage of the battery, and the other end is connected to the calculation and processing unit 702 to transmit the measured open circuit voltage of the battery to the calculation and processing unit 702. One end of the current integration measuring unit 703 is connected to one pole of the battery (which may be any pole of the battery, the anode in FIG. 8 is not limited) for measuring the current integration flowing through the battery, and the other end is connected to the calculation and processing unit. 702 is coupled to transmit the measured current integral through the battery to computing and processing unit 702. The calculation and processing unit 702 performs the method of determining the internal short circuit of the battery described in the method embodiment of the present application according to the parameters transmitted by the voltage measuring unit 701 and the current integral measuring unit 703. The specific process has been described in detail in the foregoing method embodiments, and details are not described herein.

It should be noted that, in practical applications, the voltage measuring unit 701 can measure the open circuit voltage of the battery by connecting the two poles of the battery. In the embodiment of the present application or the accompanying drawings, for the convenience of connection, the voltage measuring unit 701 can be connected to any pole of the battery, and the other battery of the default battery is grounded. In the drawing, the negative electrode of the battery is omitted as a grounding drawing. However, it is not a limitation on the connection relationship between the voltage measuring unit 701 and the battery.

Optionally, as shown in FIG. 9 , the current integration measurement unit 703 in the device 70 for determining the short circuit in the battery may specifically include a current measurement module 7031 and an integration module 7032. Among them, the current measurement module 7031 is used to measure the current flowing through the battery; the integration module 7032 is used to accumulate the current measured by the current measuring module as a current integral. The current measurement module 7031 and the integration module 7032 support the current integration measurement unit 703 to perform its function.

Further, as shown in FIG. 10, the device 70 for determining the short circuit in the battery may further include a temperature measuring unit 704 for measuring the temperature of the battery at each time when the voltage measuring unit 701 measures the open circuit voltage of the battery. Illustratively, the temperature measuring unit 704 can support the device 70 for determining a short circuit within the battery to perform step S401a or S402a in FIG. 4a or 6.

Exemplarily, the voltage measuring unit 701 can implement measurement by using an ADC; the current integration measuring unit 703 can be implemented by a resistor, an ADC, and an integrating circuit, wherein the resistor is connected in series to the positive or negative pole of the battery, and the other end of the resistor is connected to the load through the ADC. The voltage across the resistor is measured to calculate the current flowing through the battery, and the integrated current is used to obtain the amount of electricity. Computing and processing unit 702 can be a processor or controller. For example, it can be a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The temperature measuring unit 704 can be implemented by a temperature sensor, which can include a temperature sensitive resistor or a thermocouple, and an auxiliary circuit of a temperature sensitive resistor or a thermocouple.

It should be noted that the integration circuit described in the embodiment of the present application may be a coulomb meter or an accumulator.

Illustratively, when the voltage measuring unit 701 is an ADC, the current integral measuring unit 703 is a resistor, an ADC, and a coulomb counter, the temperature measuring unit 704 is a temperature sensor, and the computing and processing unit 702 is a CPU, a method of determining a short circuit in the battery is illustrated. The architecture of the device 70 connected to the battery is shown in FIG.

In the case of employing an integrated unit, FIG. 12 shows a possible structural diagram of the apparatus for determining a short circuit in the battery involved in the above embodiment. The device 120 for determining a short circuit in the battery may include a processing module 1201 and an acquisition module 1202. The processing module 1201 is for controlling the operation of the device 120 that determines the short circuit in the battery. For example, the processing module 1201 is configured to support the determination of all of the processes in FIG. 4 or FIG. 4a or FIG. In the process 120 of the processing module 1201 for supporting the determination of a short circuit within the battery to perform all of the processes of FIG. 4 or FIG. 4a or FIG. 6, the processing module 1201 controls the acquisition module 1202 to collect parameters of the battery. The device 120 for determining a short circuit within the battery may further include a storage module 1203 for storing program codes and data of the device 120 for determining a short circuit within the battery.

The processing module 1201 may be the processor 201 in the physical structure of the device 20 for determining the short circuit in the battery shown in FIG. 2, and may be a processor or a controller. For example, it can be a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. Processor 1201 may also be a combination of computing functions, such as one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The acquisition module 1202 can be the collector 203 in the physical structure of the device 20 that determines the short circuit within the battery shown in FIG. The acquisition module 1203 can be at least one of a temperature sensor, an ADC, and an integration circuit. The storage module 1203 may be the memory 202 in the physical structure of the device 20 that determines the short circuit within the battery shown in FIG. 2.

When the processing module 1201 is a processor, the collection module 1202 is a collector, and the storage module 1203 is In the case of the memory, the device 120 for determining the short circuit in the battery according to FIG. 12 of the embodiment of the present application may be the device 20 for determining the short circuit in the battery shown in FIG. 2.

As described above, the apparatus for determining the short circuit in the battery provided by the embodiment of the present application may be used to implement the method implemented in the foregoing embodiments of the present application. For the convenience of description, only the parts related to the embodiment of the present application are shown, and the specific technical details are not provided. For disclosure, please refer to various embodiments of the present application.

The steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions. The software instructions may be composed of corresponding software modules, which may be stored in RAM, flash memory, ROM, Erasable Programmable ROM (EPROM), and electrically erasable programmable read only memory (Electrically EPROM). EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

Those skilled in the art will appreciate that in one or more examples described above, the functions described herein can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer. A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit. It is also possible that each unit is physically included separately, or two or more units may be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit described above is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

Finally, it should be noted that the above embodiments are only used to explain the technical solutions of the present application, and are not limited thereto; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still The technical solutions described in the foregoing embodiments are modified, or the equivalents of the technical features are replaced by the equivalents. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (23)

1. A method for determining a short circuit in a battery, comprising:

   Measure the open circuit voltage OCV _{1 of the} battery at time t ₁ , and obtain the remaining power Q _OCV1 of the battery corresponding to the OCV ₁ in the preset correspondence, and record the _flow from the system to which the battery belongs to the time t ₁ a current integral Q _{CC1 of} the battery; wherein the preset correspondence relationship includes a correspondence relationship between an open circuit voltage of the battery and a remaining power amount;

   Measuring an open circuit voltage OCV _{2 of} the battery at time t ₂ , acquiring a remaining power quantity Q _OCV2 of the battery corresponding to the OCV ₂ in the preset correspondence relationship, and recording a booting from the system to which the battery belongs to the t ₂ current flowing through the battery, Q _CC2 ;

   _Calculating , according to the Q _OCV1 , the Q _CC1 , the Q _OCV2 , the Q _CC2 , the battery short circuit generated in the unit time between the time t _{1 and the} time t ₂ The amount of electricity is poor as the internal short circuit current I _{ISC of} the battery;

   If the I _{ISC is} greater than or equal to a preset threshold, it is determined that the battery is short-circuited.
2. The method according to claim 1, wherein said calculating said battery at said time t ₁ to said t according to said Q _OCV1 , said Q _CC1 , said Q _OCV2 , said Q _CC2 Between time ₂ , the difference in the amount of electricity generated by the short circuit in the battery per unit time, as the internal short-circuit current I _{ISC of} the battery, includes:

   Calculate the

   
3. The method according to claim 1 or 2, wherein the preset correspondence includes a correspondence between an open circuit voltage of the battery and a remaining power at different battery temperatures;

   Before acquiring the relationship of the OCV of the battery ₁ corresponds to a predetermined remaining capacity Q _OCV1 correspondence, said method further comprising: obtaining the battery temperature T ₁ at the time t ₁ is;

   Obtaining the remaining battery power Q _OCV1 of the battery corresponding to the OCV ₁ in the preset correspondence relationship, including: acquiring the battery corresponding to the OCV ₁ at the temperature T ₁ in the preset correspondence relationship Remaining power Q _OCV1 ;

   Prior to the obtaining the preset corresponding relationship in the OCV ₂ corresponding to the battery remaining capacity Q _OCV2, the method further comprising: obtaining the battery temperature T ₂ in said time t _2;

   Obtaining the remaining power quantity Q _OCV2 of the battery corresponding to the OCV ₂ in the preset correspondence relationship, including: acquiring, in the preset correspondence relationship, the OCV ₂ corresponding to the temperature T ₂ The remaining battery capacity Q _OCV2 .
4. The method of any of claims 1-3, wherein the t ₂ -t _{1 is} greater than or equal to the first predetermined time interval.
5. The method according to any one of claims 1-4, wherein if the remaining power included in the preset correspondence is the remaining battery percentage SOC, the remaining power of the battery corresponding to the OCV _{1 is} Q _OCV1 = SOC _OCV1 *FCC, the remaining power of the battery corresponding to the OCV ₂ Q _OCV2 = SOC _OCV2 * FCC; wherein the FCC is the theoretical rated full charge of the battery; or, the FCC is The current rated full charge of the battery.
6. The method according to any one of claims 1 to 5, wherein the time t ₁ or the time t _{2 is a} time when the battery is in an equilibrium state; the equilibrium state includes flowing through the battery The current per unit time is less than or equal to the duration of the preset current threshold, and is greater than or equal to the second preset time interval.
7. The method according to any one of claims 1-6, wherein before the obtaining the remaining power Q _OCV1 of the battery corresponding to the OCV ₁ in the preset correspondence, the method further comprises:

   After the battery is fully charged and stabilized at different test temperatures, the open circuit voltage corresponding to the different remaining power of the battery is tested to form a preset correspondence.
8. Method according to any of claims 1-7, characterized in that

   Said measuring cell ₁ at time t ₁ the OCV is the open circuit voltage, comprising: the battery to be stable, the measurement of the battery ₁ at the time of the open circuit voltage of the OCV t _1;

   The measurement at time t ₂ of the battery open circuit voltage OCV _2, comprising: the battery to be stable, the battery open circuit voltage OCV measured at the time t _{2 2.}
9. The method of claim 8 wherein:

   If the battery is in a state of charge, the battery is stable, including: the voltage of the battery is greater than or equal to a linear threshold, and after waiting for the battery to stop charging, keeping the charger powered to the system, and isolating the battery, waiting for the third Preset time interval;

   If the battery is in a non-charging state, the battery is stable, including: standing for a fourth preset time interval;

   If the battery-powered system is in a standby state, the battery is stable, including: after the system is woken up, a time difference between a current time and the system entering the standby state is greater than or equal to a fifth preset time interval.
10. The method according to any one of claims 3-9, wherein if the preset correspondence includes the correspondence between the open circuit voltage of the battery and the remaining power at different battery temperatures, in the calculating Before the internal short circuit current I _{ISC of} the battery, the method further includes:

    Determining whether the temperature difference of the battery is less than or equal to a temperature threshold at the time t _{2 and the} time t ₁ ;

    The calculating the internal short circuit current I _{ISC of} the battery includes:

    If the temperature difference of the battery is less than or equal to the temperature threshold at the time t _{2 and the} time t ₁ , the internal short circuit current I _{ISC of} the battery is calculated.
11. A device for determining a short circuit in a battery, characterized in that the device comprises:

    a voltage measuring unit for measuring an open circuit voltage of the battery at different times;

    a calculation and processing unit, configured to acquire a remaining amount of the battery corresponding to each open circuit voltage measured by the voltage measuring unit in the preset correspondence relationship, wherein the preset correspondence relationship includes an open circuit voltage and a remaining of the battery Correspondence of electricity;

    a current integration measuring unit, configured to measure a current integral flowing through the battery at each time when the system to which the battery belongs is turned on to the voltage measuring unit to measure an open circuit voltage;

    The calculation and processing unit is further configured to calculate, according to Q _OCV1 , Q _CC1 , Q _OCV2 , Q _CC2 , the short circuit of the battery in the unit time between the time t _{1 and the} time t ₂ The generated electric quantity difference is used as the internal short-circuit current I _{ISC of} the battery; wherein the Q _OCV1 and the Q _OCV2 are the open circuit voltage of the battery measured by the voltage measuring unit at time t _{1 and} time t _{2 .} The remaining power of the battery corresponding to the OCV ₁ and the OCV ₂ in the preset correspondence relationship; the Q _CC1 and the Q _CC2 are measured by the current integration measuring unit from the system to which the battery belongs Current integral flowing through the battery at time t _{1 and} time t ₂ ;

    The calculation and processing unit is further configured to determine a short circuit in the battery if the I _{ISC is} greater than or equal to a preset threshold.
12. The apparatus according to claim 11, wherein said calculation and processing unit is specifically configured to:

    Calculate the

    
13. The device according to claim 11 or 12, wherein the preset correspondence relationship comprises a correspondence between an open circuit voltage of the battery and a remaining power at different battery temperatures;

    The device further includes a temperature measuring unit configured to measure a temperature of the battery at each time when the voltage measuring unit measures the open circuit voltage of the battery;

    The Q _OCV1 is at a temperature T _1, the voltage of the battery in the measuring unit measures the time t ₁ the open circuit voltage of the OCV of the battery ₁ in the preset correspondence relationship corresponding to the remaining capacity, the The temperature T ₁ is the temperature of the battery measured by the temperature measuring unit at the time t ₁ ;

    The Q _OCV2 is the remaining power of the battery corresponding to the open circuit voltage OCV ₂ of the battery measured by the voltage measuring unit at the time t ₂ at the temperature T ₂ . The temperature T ₂ is the temperature of the battery measured by the temperature measuring unit at the time t ₂ .
14. Apparatus according to any one of claims 11-13, wherein said t ₂ -t _{1 is} greater than or equal to a first predetermined time interval.
15. The device according to any one of claims 11 to 14, wherein if the remaining power included in the preset correspondence is the remaining battery percentage SOC, the remaining battery power Q _OCV1 corresponding to the OCV ₁ = SOC _OCV1 *FCC, the remaining power of the battery corresponding to the OCV ₂ Q _OCV2 = SOC _OCV2 * FCC; wherein the FCC is the theoretical rated full charge of the battery; or, the FCC is The current rated full charge of the battery.
16. The device according to any one of claims 11-15, wherein the time t ₁ or the time t _{2 is a} time when the battery is in an equilibrium state; the equilibrium state includes flowing through the battery The current per unit time is less than or equal to the duration of the preset current threshold, and is greater than or equal to the second preset time interval.
17. The device according to any one of claims 11-16, characterized in that the device further comprises a modeling unit for:

    After the battery is fully charged and stabilized at different test temperatures, the open circuit voltage corresponding to the different remaining power of the battery is tested to form a preset correspondence.
18. The device according to any one of claims 11-17, wherein the voltage measuring unit is specifically configured to:

    After the battery is stabilized, the open circuit voltage of the battery at different times is measured.
19. The device of claim 18 wherein:

    If the battery is in a state of charge, the battery is stable, including: the voltage of the battery is greater than or equal to a linear threshold, and after waiting for the battery to stop charging, keeping the charger powered to the system, and isolating the battery, waiting for the third Preset time interval;

    If the battery is in a non-charging state, the battery is stable, including: standing for a fourth preset time interval;

    If the battery-powered system is in a standby state, the battery is stable, including: after the system is woken up, a time difference between a current time and the system entering the standby state is greater than or equal to a fifth preset time interval.
20. The device according to any one of claims 13 to 19, wherein if the preset correspondence relationship includes a correspondence between an open circuit voltage of the battery and a remaining power at different battery temperatures,

    The device further includes a determining unit, configured to determine whether the temperature difference of the battery of the temperature measuring unit is less than or equal to a temperature threshold at the time t ₂ and the time t ₁ ;

    The calculating and processing unit is specifically configured to: if the determining unit determines the time t ₂ and the time t ₁ , the temperature difference of the battery is less than or equal to the temperature threshold, calculate an internal short circuit of the battery Current I _ISC .
21. The device according to any one of claims 11 to 19, wherein the current integration measuring unit comprises a current measuring module and an integrating module;

    The current measuring module is configured to measure a current flowing through the battery;

    The integration module is configured to integrate the current measured by the current measurement module.
22. The device for determining a short circuit in a battery, wherein the device comprises a processor and a memory collector; the memory is configured to store a computer execution instruction and a preset correspondence; the collector is configured to collect the determined battery The parameter of the battery connected to the shorted device; when the device for determining the short circuit in the battery is running, the processor calls the computer execution instruction stored in the memory, the parameter of the battery collected by the collector, and executes the claim 1 The method of any of 10, determining whether the battery has an internal short circuit.
23. A computer readable storage medium, comprising: instructions, when executed on a computer, causing the computer to perform the method of any of claims 1-10.

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