CN110764014A

CN110764014A - Method and device for detecting short circuit in battery, terminal and readable storage medium

Info

Publication number: CN110764014A
Application number: CN201810834338.5A
Authority: CN
Inventors: 刘雪峰; 吴飞; 王可飞; 金娟; 谢洪; 陈光辉
Original assignee: Ningde Amperex Technology Ltd; Dongguan Nvt Technology Co Ltd
Current assignee: Ningde Amperex Technology Ltd; Dongguan Nvt Technology Co Ltd
Priority date: 2018-07-26
Filing date: 2018-07-26
Publication date: 2020-02-07

Abstract

The method, the device, the terminal and the readable storage medium for detecting the internal short circuit of the battery are used for detecting the internal short circuit of the battery. The method comprises the following steps: detecting a battery parameter of the battery over a first period of time; according to the battery parameters, calculating the loss capacity and the actual use capacity of the battery in the first time period; calculating a battery capacity difference between the lost capacity and the actual used capacity; and determining a judgment result indicating whether the battery has an internal short circuit or not according to the battery capacity difference value and a preset capacity difference value.

Description

Method and device for detecting short circuit in battery, terminal and readable storage medium

Technical Field

The present invention relates to the field of battery technologies, and in particular, to a method and an apparatus for detecting a short circuit in a battery, a terminal, and a readable storage medium.

Background

The lithium ion battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, is widely used on portable electronic equipment such as mobile phones, digital cameras, portable computers and the like, has wide application prospect in the aspects of large and medium-sized electric equipment such as electric vehicles such as electric bicycles, electric vehicles and the like, energy storage facilities and the like, and becomes a key for solving global problems such as energy crisis, environmental pollution and the like.

Currently, during the use of battery products, the risk of internal short circuit of the battery may be caused due to long-term recycling or abuse by users. If the battery is not managed or monitored, the battery is continuously used under the condition that the internal short circuit problem exists, the unsafe problem can be further upgraded, further accidents such as fire, explosion and the like are generated, property loss of a user is caused, and even personal safety of the user is endangered, but no effective means is provided for detecting the internal short circuit of the battery at present.

Disclosure of Invention

The method, the device, the terminal and the readable storage medium for detecting the internal short circuit of the battery are used for detecting the internal short circuit of the battery.

In a first aspect, an embodiment of the present invention provides a method for detecting a short circuit in a battery, including:

detecting a battery parameter of the battery over a first period of time;

according to the battery parameters, calculating the loss capacity and the actual use capacity of the battery in the first time period;

calculating a battery capacity difference between the lost capacity and the actual used capacity;

and determining a judgment result indicating whether the battery has an internal short circuit or not according to the battery capacity difference value and a preset capacity difference value.

Optionally, the step of determining a determination result indicating whether the battery has an internal short circuit according to the battery capacity difference and a preset capacity difference includes:

and if the battery capacity difference is larger than or equal to a preset capacity difference, determining that the battery has an internal short circuit.

Optionally, before calculating the loss capacity and the actual usage capacity of the battery in the first time period according to the battery parameter, the method further includes:

acquiring historical battery parameters of the battery in a second time period before the first time period;

calculating the total battery capacity of the battery according to the historical battery parameters;

then, the step of calculating the loss capacity of the battery in the first time period according to the battery parameter includes:

according to the battery parameters, determining a first electric quantity state parameter corresponding to the battery at the starting time of the first time period and a second electric quantity state parameter corresponding to the ending time of the first time period;

and calculating the loss capacity of the battery in the first time period according to the first electric quantity state parameter, the second electric quantity state parameter and the total capacity of the battery.

Optionally, the step of calculating the loss capacity according to the first state of charge parameter, the second state of charge parameter, and the total capacity of the battery includes:

calculating a difference between the first state of charge parameter and the second state of charge parameter;

determining a product of the difference and the total battery capacity as a lost capacity of the battery over the first time period.

Optionally, the step of calculating the actual usage capacity of the battery according to the battery parameter includes:

determining a duration parameter and a current parameter corresponding to the first time period;

and determining the actual use capacity of the battery in the first time period according to the current parameter and the duration parameter.

Optionally, after determining that the battery has an internal short circuit, the method further includes:

determining a short-circuit current corresponding to an internal short circuit of the battery according to the battery capacity difference value and the duration parameter corresponding to the first time period;

and if the short-circuit current is determined to be larger than or equal to the current threshold, switching the battery to a non-working state.

Optionally, the method further includes:

obtaining a plurality of historical short-circuit currents;

setting the current threshold according to the plurality of historical short circuit currents.

In a second aspect, an embodiment of the present invention provides a detection apparatus, including:

the detection unit is used for detecting the battery parameters of the battery in a first time period; and

the processing unit is electrically connected with the detection unit and used for calculating the loss capacity and the actual use capacity of the battery in the first time period according to the battery parameters and calculating the battery capacity difference value between the loss capacity and the actual use capacity; and determining a judgment result indicating whether the battery has an internal short circuit or not according to the battery capacity difference value and a preset capacity difference value.

Optionally, the detecting unit is configured to detect a battery parameter of the battery within a first time period; and

Optionally, the processing unit is further configured to:

Optionally, the detection apparatus further includes:

a first obtaining unit, configured to obtain a historical battery parameter of the battery in a second time period before the first time period before calculating a loss capacity and an actual usage capacity of the battery in the first time period according to the battery parameter;

then, the processing unit is further configured to:

Optionally, the processing unit is further configured to:

Optionally, the detection device further includes:

the determining unit is used for determining the short-circuit current corresponding to the internal short circuit of the battery according to the battery capacity difference value and the duration parameter corresponding to the first time period;

the processing unit is further to: and when the short-circuit current is greater than or equal to the current threshold, switching the battery to a non-working state.

Optionally, the detecting device further includes:

a second acquisition unit for acquiring a plurality of historical short-circuit currents; and

and the updating unit is used for setting the current threshold according to the plurality of historical short-circuit currents.

In a third aspect, an embodiment of the present invention provides a terminal, including:

a battery;

the detection device is connected with the battery and is used for detecting the battery parameters of the battery in a first time period; according to the battery parameters, calculating the loss capacity and the actual use capacity of the battery in the first time period; calculating a battery capacity difference between the lost capacity and the actual used capacity; determining a judgment result indicating whether the battery has an internal short circuit or not according to the battery capacity difference value and a preset capacity difference value; and

and the processor is connected with the detection device and used for outputting a corresponding control instruction according to the judgment result output by the detection device.

In a fourth aspect, an embodiment of the present invention provides a terminal, where the terminal includes a processor, and the processor is configured to implement the method according to the first aspect when executing a computer program stored in a memory.

In a fifth aspect, the present invention provides a readable storage medium, which stores computer instructions, and when the instructions are executed on a terminal, the instructions cause the terminal to execute the method according to the first aspect.

In the embodiment of the invention, the loss capacity and the actual use capacity of the battery in the first time period are determined by detecting the battery parameters in the first time period in the use process of the battery, then the battery capacity difference value between the loss capacity and the actual use capacity is calculated, and the judgment result indicating whether the battery has the internal short circuit or not is determined according to the battery capacity difference value and the preset capacity difference value, so that the battery abnormity can be detected before the battery is abnormal according to the judgment result, and the accident caused by the battery abnormity is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.

FIG. 1 is a flow chart of a method for detecting a short circuit in a battery according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a relationship between an SOC-OCV curve and a voltage of a battery according to an embodiment of the present invention;

FIG. 3 is a flow chart illustrating the detection of short circuit in the battery by the detection device according to the embodiment of the present invention;

FIG. 4A is a first schematic structural diagram of a detecting device according to an embodiment of the present invention;

FIG. 4B is a schematic structural diagram of a second exemplary embodiment of a detecting device according to the present invention;

FIG. 4C is a schematic circuit diagram of a detecting device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a terminal in an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a terminal according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

First, some terms in the embodiments of the present invention are explained so as to be easily understood by those skilled in the art.

1) And the state of charge parameter is used for representing the parameter of the state of charge of the battery. Herein, the State of Charge parameter may refer to a parameter for describing a remaining Charge of the battery, such as a battery saturation or a State of Charge (SOC), etc.; and, the state-of-charge parameter may also refer to a parameter for describing the amount of charge that the battery has discharged, such as Depth of discharge (DOD), etc., and DOD is 1-SOC.

The battery saturation is a description of the cell capacity state, and the calculation method of the battery saturation comprises the following steps: SOC is the remaining capacity/full charge capacity. Thus, SOC may be used herein subsequently to characterize battery saturation or state of charge.

SOC has a lower limit, usually 0, and an upper limit, usually 100%. Here, 0 corresponds to a state where the Open Circuit Voltage (OCV) of the battery is at the discharge cutoff lower limit Voltage, and 100% corresponds to a state where the OCV of the battery is at the charge cutoff upper limit Voltage. And the SOC value changed from 0-100% is the full charge capacity of the battery. Of course, in some cases or special applications, for example, when the state of the battery is required to be recorded during overcharge or overdischarge, the lower limit value range of the SOC may be lower than 0, and the upper limit value range may be higher than 100%.

In practical application, the SOC can be divided into N-1 parts according to a preset rule from a lower limit value range to an upper limit value range, so that N SOC demarcation points can be obtained. The preset rule may be an average equal division, or may be a division according to other rules. N is a natural number of 1-1000, preferably, N can be 10-20. Then, for the monitored battery, before leaving the factory, the open-circuit voltage OCV values of the battery corresponding to N different saturation SOCs can be tested, i.e. N sets of data corresponding to SOC-OCV one to one can be obtained, and then the data is burned into the fixed parameter storage unit, i.e. the battery saturation and open-circuit voltage variation curves.

2) The detection device may be a stand-alone device or may be a functional module built in the terminal, such as a functional module for a detection system in the terminal. The terminal may be a server, a mobile terminal or other device having a battery detection system.

In practical applications, the detection device itself may have a certain data processing capability if it is a stand-alone device. For example, the detection device includes a microprocessor, such as a Micro Controller Unit (MCU), and the MCU can analyze and process the detected data and communicate with the detection system in the terminal. Alternatively, if the detection device is a function module built in the terminal, after detecting the data related to the battery, the detection device may send the detected data to other function modules in the terminal for processing, for example, the detection device transmits the data to a CPU in the terminal for processing. In any case, the detection device adopts the same data processing process when judging whether the battery has the internal short circuit. In this document, a process of performing data processing by the detection device is mainly described as an example.

In the embodiment of the invention, the detection device can have the capabilities of data processing, data storage and the like. Some fixed parameters or basic data can be burned in the detection device in advance. For example, the detection device may pre-store a variation curve of the battery saturation SOC and the open-circuit voltage OCV, and the variation curve is mainly used for recording a one-to-one correspondence relationship between the battery saturation and the open-circuit voltage, which is also called an SOC-OCV curve; or a pre-stored relevant change table or curve of the SOC and the internal resistance R can be expressed as an internal resistance table. In addition, parameters such as temperature impedance change coefficient, battery aging coefficient and the like can be prestored in the detection device, and the data can be stored in a storage unit of the detection device.

3) And/or, the association relationship used to describe the association object indicates that there may be three relationships, for example, a and/or B, which may indicate: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

The technical solution provided by the embodiments of the present invention is described in detail below with reference to the drawings of the specification.

Example one

Fig. 1 is a flowchart of a method for detecting a short circuit in a battery according to an embodiment of the present invention, where the method can be applied to the above-mentioned detection device, and the detection device can be built in a terminal. The procedure of the detection method can be described as follows:

s11: a battery parameter of the battery over a first time period is detected.

The battery in the embodiment of the present invention may be a secondary battery, such as a lithium ion battery, or may also be other chargeable and dischargeable batteries, and the battery may be built in a terminal, such as a battery of a notebook or a mobile phone.

The first time period may be a preset time period, for example, the current time period or other time periods, and the designer may set the time period according to actual requirements. The detection device can acquire the battery parameters of the battery in a working state in real time in a first time period, wherein the battery parameters comprise internal resistance, voltage, current, state of charge and the like.

It should be noted that the operating state of the battery in the first time period may include one or more of charging, discharging or standing. For example, the battery may be in a state of being charged and discharged at the same time, i.e., a charge-discharge state; alternatively, the battery may be in a charged, discharged, or rest state only. In the static state, the battery power is still slightly consumed.

Specifically, when detecting the battery parameters, the detection device may be connected to the battery through a corresponding detection circuit to detect and obtain the battery parameters of the battery in real time. In practical applications, the detecting device may detect relevant parameters of the battery cell when detecting the battery parameter, such as internal resistance (hereinafter also referred to as impedance), voltage, current, and state of charge of the battery cell. The first time period may be any time period during real-time detection, and may include a plurality of moments, and each moment corresponds to a battery parameter during real-time detection, and stores the corresponding battery parameter.

The process of acquiring and recording battery parameters (mainly current, voltage and impedance) by the detection device will be described in detail below.

Current and voltage acquisition and recording

In the embodiment of the invention, when the detection device collects the current and the voltage in the battery parameters, the current and the voltage can be collected by the current and voltage collector, namely the current (I) and the voltage (U) output by the battery core in real time are mainly collected.

Specifically, the current and voltage collector in the detection device can collect the output current (I) and the output voltage (U) of the electric core at regular time, and the current and voltage collector and the output voltage (U) can work synchronously or asynchronously, preferably synchronously. The acquisition period of the acquisition device can be any time from 1ms to 10s, and the preferred acquisition period is 250 ms.

Further, after the detection device collects the current and voltage parameters, the current and voltage parameters can be stored, for example, in a memory, or in a cloud.

If the detection device stores the data collected by the current and voltage collectors into the memory, and the memory has N storage units, N groups of collected data can be stored. That is, the memory may record N sets of current and voltage data up to the current acquisition cycle before N-1 acquisition cycles. N is determined according to acquisition requirements and cost and can be 1-10⁷s is a value, but preferably 1 to 10000s divided by the data acquisition period. For example, if the current and voltage collection period is 250ms and 300s of historical data needs to be collected, then N is 1200. Of course, in practical applications, in order to save storage space and cost, only the current parameter or only the voltage parameter may be stored, but preferably both are stored.

In practical applications, in order to save cost and save longer data information, the memory may be divided into a plurality of parts, for example, the first part records the historical data acquired each time from 0 to T1, the second part records the historical data acquired at intervals from T1 to T2 in the past at intervals of fixed acquisition points, the third part records the historical data acquired at intervals from T2 to T3 in the past at intervals of longer fixed acquisition points, and so on.

The detection device can store the detected battery parameters by adopting a rolling updating mode. If the storage mode of the storage unit in the detection device adopts a rolling updating mode, when new collected data exist, the stored data of the Xth storage unit are automatically transmitted to the (X + 1) th storage unit, X is more than or equal to 1 and is less than N, then when new collected data enter the first storage unit, the collected data of the previous Nth storage unit are eliminated and changed into the data of the previous (N-1) th storage unit, and thus the stored data can be updated according to real-time detection.

Second, testing and recording of internal resistance (impedance)

The method mainly comprises the steps of testing and recording the impedance of a battery core, and temporarily storing the impedance in a storage unit. When the impedance detection is performed, the detection device can calculate the cell impedance (R) according to the current value (I) and the voltage value (U) recorded in the current and voltage acquisition and storage unit. The specific process is as follows:

1) monitoring a first saturation in the first saturation calculation unit, noted SOC₁Value (SOC)₁Will be described later in detail), and further, table lookup is performed on the SOC-OCV curve data stored in the storage unit in advance, when the SOC is reached₁The value is equal to any SOC value in the data table, such as SOC₁＝SOC_iWhen the impedance is calculated, starting impedance calculation;

2) starting the impedance calculation, the calculation method may include, but is not limited to, the following two methods:

impedance calculation method 1:

a1) reading the two sets of stored synchronized current and voltage data, respectively (I1, U1) and (I2, U2), wherein the currents I1, I2 can be instantaneous values of a certain collection point, preferably instantaneous values recommended as a current test point; it may also be an average of a plurality of collection points, preferably recommended as an average of the current from the current test point to a past time (e.g., within a first time period). Accordingly, the voltages U1, U2 should also be corresponding instantaneous or average values;

b1) calculating real-time impedance R, wherein the calculation method comprises the following steps: r ═ (U1-U2)/(I1-I2).

Impedance calculation method 2:

a2) reading a first saturation SOC₁And looking up the SOC-OCV curve data stored in the storage unit to find the SOC interval (SOC) corresponding to the saturation_x，SOC_x+1) And a corresponding open circuit voltage interval (OCV)_x，OCV_x+1)；

b2) Calculating the open-circuit voltage according to a linear difference algorithm, wherein the specific calculation method comprises the following steps: OCV (OCV)_x+(OCV_x+1-OCV_x)*(SOC₁-SOC_x)/(SOC_x+1-SOC_x)；

c2) Calculating the current electrical core impedance, wherein the calculation formula is as follows: r ═ U-OCV)/I, where U is the current voltage instantaneous value, or the average value of the voltage from the current test point to a past time; and I is the instantaneous value of the current test point or the historical average value.

3) After starting the impedance calculation, the above impedance calculation is performed N times, and the calculation result is recorded. Wherein N may be a natural number greater than 1, preferably, N is 50;

4) calculating the average value of the impedances of the N points to obtain the SOC of the battery cell saturation_iImpedance value R of time cell_i。

After the detection device detects and obtains the impedance value of the battery core, the impedance value of the battery core can be stored. For example, the impedances of the N points are stored by a memory, and the cell saturation is updated to be the node SOC_iCell impedance value (R) of time_i)。R_iThe following rules may be employed for the update of (c): when calculated R_iAnd R stored in the storage unit_iThe difference is less than a predetermined value R_sThen, the R of the calculation is reserved_iValue as R_iThe latest value of (c); when calculated R_iAnd R stored in the storage unit_iThe difference being greater than a predetermined value R_sThen, the value of the memory cell is continuously reserved as R_iThe latest value of (c).

It should be noted that, in practical applications, the internal resistance of the battery is correlated with the temperature of the battery, that is, a change in the temperature of the battery causes a change in the internal resistance. Therefore, when the internal resistance is detected, the temperature of the battery cell in the battery can be detected, and the magnitude of the internal resistance is determined according to the corresponding relation between the temperature of the battery cell and the internal resistance. Alternatively, the cell temperature of the battery may be determined based on the detected internal resistance of the battery.

S12: and calculating the loss capacity and the actual use capacity of the battery in the first time period according to the battery parameters.

The loss capacity may be a capacity consumed by the battery during a period of time, and the actual usage capacity may represent a capacity input or output by the terminals of the battery during the period of time (i.e., an amount of power actually used).

After the detection device detects the battery parameters, corresponding calculation can be performed according to the battery parameters, so that the loss capacity and the actual use capacity of the battery in the first time period in the use process are determined.

Specific algorithms for the loss capacity and the actually used capacity are described below:

in a first aspect: the detection device determines the actual usage capacity of the battery in the first time period according to the current in the battery parameter.

In calculating the actual usage capacity, the detection device calculates the actual usage capacity (i.e., the actual usage electric quantity) input or output by the terminal of the battery during the time period, including the processes of charging, discharging or standing, according to the current (I) in the battery parameter and the time length parameter corresponding to the time period (i.e., the time interval T between T1 and T2). Where Q1 is used to represent the actual capacity used, then:

Q1＝∫Idt

where I represents the current at each instant in time t, and ^ represents the integral calculation, i.e., the current I is integrated over time t.

Therefore, the detection device can calculate and know the capacity change caused by the input or output current, namely the actual used capacity by performing time integration on the output current in the first time period.

In a second aspect: the detection device determines the loss capacity of the battery in the first time period according to the internal resistance and the voltage in the battery parameters detected in real time.

In one embodiment of the present invention, when calculating the loss capacity, a first electrical quantity state parameter corresponding to the starting time of the battery in the first time period and a second electrical quantity state parameter corresponding to the ending time of the first time period may be determined according to the battery parameter; and then, according to the first electric quantity state parameter, the second electric quantity state parameter and the total capacity of the battery, the loss capacity of the battery in the first time period can be calculated.

In the following, the calculation process of the loss capacity is described by taking the state of charge parameter as the DOD parameter as an example:

in step 21, the detection device determines a first voltage of the battery at a starting time of a first time period and a first depth of discharge parameter (hereinafter abbreviated as DOD1) corresponding to the first voltage, and determines a second voltage of the battery at an ending time of the time period and a second depth of discharge parameter (hereinafter abbreviated as DOD2) corresponding to the second voltage, where DOD is used to indicate a percentage of a consumed capacity of the battery to a rated capacity of the battery during a battery using process, where the rated capacity refers to a total capacity of the battery.

When determining the DOD corresponding to a certain voltage, the DOD may be determined according to an SOC-OCV curve corresponding to a cell temperature at a corresponding detection time, the SOC-OCV curve depends on a battery chemistry system, and the SOC-OCV curves corresponding to different battery chemistry systems are different.

Generally, the SOC-OCV curve of a battery is fixed during a static process, i.e., a process of charging/discharging the battery with a very small current, typically 0.01C or less (e.g., for consumer LCO batteries). Thus, during the quiescent state, the battery is in an extremely fine steady state charge-discharge environment. Under the charging and discharging environment, the SOC-OCV curve corresponding to the battery cell can be obtained through measurement. Of course, the internal resistance of the battery may change slightly due to the service life relationship, so during the measurement process, the adjustment and correction can be performed through the impedance tracking of the fuel gauge, so as to improve the accuracy of the SOC-OCV curve.

In addition, during the use process of the battery, the internal resistance characteristic of the battery cell is influenced by the change of the temperature, so that the change of the SOC-OCV curve corresponding to the battery cell is influenced, and the SOC-OCV curve of the battery in the use process is different from the SOC-OCV curve under the static condition. Meanwhile, the current (such as charging and/or discharging) of the battery in the using process is larger than the test current in the static process, the voltage (marked as V01) in the SOC-OCV curve corresponding to the charging and/or discharging process has a higher change speed than the voltage (marked as V02) in the static process, namely the V01 in the charging process is higher than V02, the V01 in the discharging process is lower than V02, and the specific change speed is different with different specific charging and discharging current values.

Therefore, in the embodiment of the present invention, the detection device may pre-test the SOC-OCV curves corresponding to the battery cells of the battery at different temperatures (or internal resistances), and record the corresponding relationship between the battery cell temperature (or internal resistance) and the SOC-OCV curves, for example, record the corresponding relationship in a list, and after subsequently detecting the battery cell temperature (or internal resistance), determine the corresponding SOC-OCV curves by looking up the table.

Then, after obtaining the battery parameters at the starting time (noted T1) of the first time period in step 21, the detection device may determine the internal resistance (corresponding cell temperature noted T1) and the first voltage (V1) of the T1 battery. The SOC-OCV curve corresponding to the battery cell at T1 can be determined through table lookup, and the DOD1 corresponding to V1 is calculated according to the SOC-OCV curve. Similarly, after obtaining the internal resistance (the corresponding cell temperature is recorded as T2) and the second voltage (V2) at the end time (recorded as T2) of the first time period, the detection device may determine DOD2 corresponding to V2 according to the same calculation method. Fig. 2 is a diagram illustrating a correspondence relationship between an SOC-OCV curve and a voltage of a battery.

And step 22, calculating the loss capacity of the battery by combining the total battery capacity of the battery according to the obtained DOD1 and DOD2, wherein the total battery capacity can refer to the capacity of the battery when no internal short circuit exists. Where Q2 is used to represent the lost capacity of the battery over the time period, then:

Q2＝(DOD1-DOD2)*Capacity

in the formula, Capacity represents the total battery Capacity corresponding to the first time period, DOD1 represents the depth of discharge parameter corresponding to the voltage at the start time of the test, and DOD2 represents the depth of discharge parameter corresponding to the voltage at the end time of the test.

During the use process of the battery, the actual total capacity of the battery is changed relative to the total capacity of the battery when the battery leaves a factory. Therefore, when calculating the total current capacity of the battery, the calculation can be implemented by relying on the battery parameters detected in a second time period before the first time period, and the calculation process of the total battery capacity is as follows:

step 31: acquiring historical battery parameters of a battery in a second time period before the first time period;

step 32: according to the historical battery parameters, determining the historical use capacity of the battery in the second time period, and a third electric quantity state parameter corresponding to the starting time and a fourth electric quantity state parameter corresponding to the ending time of the battery in the second time period;

step 33: and calculating the total battery capacity of the battery according to the historical use capacity, the third electric quantity state parameter and the fourth electric quantity state parameter.

The implementation process of the specific algorithm for the third state of charge parameter, the fourth state of charge parameter and the total battery capacity may be described as follows:

1. reading current data in the current collector according to the voltage value and the current integration unit, integrating the current data with time, and calculating a coulomb integration capacity value Q, namely the historical use capacity of the battery in a second time period;

2. calculating the maximum or total capacity Q of the battery_maxI.e. maximum capacity Q for the battery_maxInitialization, the initialization process mainly includes:

(1) calculation of the third State of Charge parameter (Low saturation initialization)

① detecting device monitoring low voltage timer T_lowAnd monitoring the stored current value I and voltage value U when T_lowInitializing the minimum time interval T_iniThe voltage value U is lower than the initialization judgment voltage U_minAnd the current value I is less than the standby critical value I_restAnd reading the current voltage value U. Wherein the current value I may be a single value of the current acquisition point, or an average value of the current acquisition point and a plurality of acquisition points before the current acquisition point, T_ini、U_min、I_restIs a value, T, pre-stored (burned) in a fixed memory location_iniThe value can be set according to requirements, for example, the value is set to be any value of 0-365 days (day), preferably 10-10 days, and 24 hours is recommended. U shape_minThe value can be set to any value of 0V-1000V according to the battery system and application requirements, and preferably, 2.8V-3.7V is recommended to be selected in the single-string design of the lithium battery. I is_restThe value can be set to any value of 0-1000A according to application requirements and use working conditions, and preferably 50mA is recommended to be selected in the smart phone;

② the detection device reads the current voltage value, and compares the battery Saturation (SOC) and the on-state stored in the storage unitLooking up the table for the data corresponding to the road voltage (OCV) to determine the OCV interval corresponding to the voltage value U, for example (OCV)_x，OCV_x+1) And a corresponding SOC interval, e.g., (SOC)_x，SOC_x+1) And simultaneously, the internal resistance value (R) corresponding to the SOC interval can be found by looking up the internal resistance table_x，R_x+1)；

③, the detection device calculates the cell internal resistance R when the OCV is U according to a linear difference algorithm, and the calculation formula is that R is R_x+(R_x+1–R_x)*(U–OCV_x)/(OCV_x+1–OCV_x)；

④, calculating an open circuit voltage value OCV at the corrected collection point according to the OCV (U + I R);

⑤ looking up table for corresponding data of battery saturation SOC and open-circuit voltage OCV in fixed storage unit according to open-circuit voltage value OCV, and finding out OCV interval (OCV) corresponding to open-circuit voltage value OCV_x，OCV_x+1) And a corresponding SOC interval (SOC)_x，SOC_x+1)；

⑥ calculating the cell saturation SOC when the voltage is U according to the linear difference algorithm_lowI.e. a third state of charge parameter. The specific calculation method is SOC_low＝SOC_x+(SOC_x+1–SOC_x)*(U–OCV_x)/(OCV_x+1–OCV_x)；

⑦ recording the saturation value as SOC_lowCoulomb integrated capacity value Q_lowAnd will timer T_lowAnd clearing and restarting the timer.

(2) Calculation of the fourth State of Charge parameter (high saturation initialization)

① detecting device monitoring low voltage timer T_highAnd monitoring the current value I and the voltage value U in the memory cell 1 when the time T is_highInitializing the minimum time interval T_iniAnd the voltage value U is lower than the initialization judgment voltage U_maxAnd the current value I is less than the standby critical value I_restAnd reading the current voltage value U. The current value I may be a single value of the current acquisition point, or may be an average value of the current acquisition point and a plurality of acquisition points before the current acquisition point.Wherein, T_ini、U_max、I_restIs a value, T, burned in a fixed memory cell_iniAnd I_restThe same as in step a3) at the time of the saturation initialization described earlier. U shape_maxThe value can be set to any value of 0V-1000V according to the battery system and application requirements, and preferably, 4.9V-5V is recommended to be selected in the single-string design of the lithium battery;

② looking up the corresponding data of battery saturation SOC and open-circuit voltage OCV in the fixed storage unit according to the read current voltage value, and finding out the OCV interval (OCV) corresponding to the voltage value U_x，OCV_x+1) And a corresponding SOC interval (SOC)_x，SOC_x+1) And simultaneously looking up the internal resistance table to find the internal resistance value (R) corresponding to the SOC interval_x，R_x+1)；

③, calculating the internal resistance of the battery cell when the OCV is U according to a linear difference algorithm, and concretely calculating the method that R is R_x+(R_x+1–R_x)*(U–OCV_x)/(OCV_x+1–OCV_x)；

⑥ calculating the cell saturation SOC when the voltage is U according to the linear difference algorithm_highI.e. a fourth state of charge parameter. The specific calculation method is SOC_high＝SOC_x+(SOC_x+1–SOC_x)*(U–OCV_x)/(OCV_x+1–OCV_x)；

⑦ recording the saturation value as SOC_highCoulomb integrated capacity value Q_highAnd will timer T_highResetting and restarting the timer;

(3) calculating the maximum or total capacity Q of the battery_maxThe calculation method comprises the following steps: q_max＝(Q_high–Q_low)/(SOC_high–SOC_low)；

3. Reading the coulomb integral capacity Q, and calculating the capacity value delta Q which changes from the last saturation initialization to the current acquisition point as Q-Q_low；

4. Calculating the current first saturation (namely the first electric quantity state parameter), wherein the calculation method comprises the following steps: SOC₁＝SOC_low+ΔQ/Q_max。

In practical applications, the detection means may be adapted to calculate a parameter of the process, such as SOC_low、T_low、Q_low、SOC_high、T_high、Q_highAnd SOC₁And so on.

Furthermore, when calculating the total battery capacity in step 33, the difference (percentage) between the fourth state of charge parameter and the third state of charge parameter may be calculated first, and then the actually used capacity is divided by the percentage difference, so as to obtain the total battery capacity Q_max(specifically, as described in step (3) when the total battery capacity is calculated as described above), the total battery capacity may be used as the total battery capacity corresponding to the next time period (i.e., the first time period) after the second time period, so as to calculate the consumed capacity of the battery in the first time period.

In order to improve the accuracy of calculating the loss capacity, in another embodiment of the present invention, a second saturation (a second state of charge parameter) of the battery may be calculated according to a first saturation of the battery, and a real capacity of the battery, i.e., the loss capacity, may be determined according to the first saturation, the second saturation and the total capacity of the battery. The implementation process can be described as follows:

(1) calculation of the second State of Charge parameter (second saturation)

① read the SOC of the first SOC parameter (first saturation)₁Reading the SOC/R impedance table (i.e. internal resistance table) stored in the impedance storage unit to determine SOC₁In the SOC interval (SOC)_x，SOC_x+1) And a corresponding impedance interval (R)_x，R_x+1)；

② calculating the real-time resistance according to the linear difference algorithmanti-R. The specific calculation method is that R ═ R_x+(R_x+1–R_x)*(SOC₁–SOC_x)/(SOC_x+1–SOC_x)；

③, reading a current value I and a corresponding voltage value U of the current-voltage storage unit, and calculating an open-circuit voltage OCV, wherein the current I is an instantaneous value of a current test point, or an average value of the current from the current test point to a past period of time, or a combined value of the instantaneous value and the average value, and correspondingly, the voltage U should be a corresponding instantaneous value, or an average value, or a combined value;

④ looking up table for corresponding data of battery saturation SOC and open-circuit voltage OCV in fixed storage unit according to open-circuit voltage value OCV, and finding out OCV interval (OCV) corresponding to open-circuit voltage value OCV_x，OCV_x+1) And a corresponding SOC interval (SOC)_x，SOC_x+1)；

⑤ calculating the cell saturation SOC according to the linear difference algorithm, wherein the specific calculation method is SOC (state of charge) ═ SOC_x+(SOC_x+1–SOC_x)*(U–OCV_x)/(OCV_x+1–OCV_x)；

⑥ substituting the calculated SOC value into step ①, repeating steps ① - ④ N times, N is natural number ≥ 1, and N is preferably 3, and calculating to determine final SOC, and recording as second saturation SOC₂；

⑦ according to the first SOC parameter₁And a second SOC parameter₂And maximum capacity Q of battery_maxThe loss capacity Q2 of the battery is calculated.

The detecting device is determining the second saturation SOC₂And then storing the calculated temporary storage data.

The maximum capacity Q of the battery obtained by the above calculation_maxThe loss capacity Q2 of battery is calculated to first saturation and second saturation, can more laminate the actual service condition of battery, and then can improve the judgement accuracy to short circuit in the battery, and the precision is higher.

S13: the battery capacity difference between the lost capacity and the actually used capacity is calculated.

After calculating the loss capacity (Q2) and the actual usage capacity (Q1) of the battery in the first time period, the detection device may further calculate a capacity difference of the battery in the first time period, which is referred to as a battery capacity difference value, and is denoted as Δ Q, then:

ΔQ＝Q2-Q1

generally speaking, if an internal short circuit occurs inside the battery, the state of charge parameters (such as DOD or SOC) of the battery will be different, and the capacity that can be actually used, i.e. the actually used capacity (Q1) and the actually consumed capacity (Q2) will be different, so that whether the battery is internally short-circuited can be determined according to the capacity difference.

S14: the detection device determines a judgment result indicating whether the battery has the internal short circuit or not according to the battery capacity difference value and the preset capacity difference value.

In the embodiment of the present invention, the preset capacity difference may be set in advance according to the battery cell characteristics, or may also be set by a designer according to a use requirement. The detection device compares the battery capacity difference with a preset capacity difference, and if the battery capacity difference does not exceed the preset capacity difference, the judgment result is that the battery has no internal short circuit; otherwise, if the battery capacity difference is larger than or equal to the preset capacity difference, determining that the judgment result indicates that the battery has an internal short circuit.

In another embodiment of the present invention, the capacity may be converted into the amount of current to monitor and determine whether the internal short circuit occurs in the battery at S14. The current threshold corresponding to the preset capacity difference may be within an allowable range when the internal short circuit does not occur, for example, the current threshold corresponding to the preset capacity difference may be 10 mA. When the corresponding current value converted by the battery capacity difference is less than 10mA, the battery has no internal short circuit, and if the current value exceeds 10mA, the internal short circuit is determined to exist.

Therefore, the internal short circuit of the battery can be quickly and accurately detected, and the efficiency is high.

In another embodiment of the present invention, the detecting device may further calculate a short-circuit current of the short circuit in the battery if the determination result indicates that the internal short circuit exists in the battery. The short-circuit current can be determined by calculating the ratio of the battery capacity difference (delta Q) to the time length parameter (t) corresponding to the time period, and if the short-circuit current is marked as I_{Short circuit}Then, there are:

I_{short circuit}＝ΔQ/t

In practical application, the detection device can calculate and monitor the short-circuit current in real time. The specific process is as follows:

(1) the detection device can screen and record relevant data through a data recording and storing unit thereof so as to calculate the short-circuit current, and the recorded data comprises but is not limited to a coulometer Q value and a second saturation SOC₂Value, value of timer Ts.

In practical applications, if the storage unit in the detection device is divided into N storage areas, N groups of data can be stored, where N is an integer ≧ 1, for example, N ═ 10. The detection means may monitor the relevant parameters and when the conditions are met, data recording may be initiated. The relevant parameters and the corresponding conditions that are satisfied are illustrated as follows:

① monitoring current value I, and starting data recording when I > 0, wherein I can be current collection value or average value in current voltage storage unit;

② monitoring current value I, and starting data recording when I is less than 0, wherein I can be current collection value or average value in current voltage storage unit;

③ monitoring current value I, and starting data recording when I is greater than or equal to a first preset value or less than or equal to a second preset value, wherein I can be current collection value or average value in current and voltage storage unit;

④ monitoring voltage value U, and starting data recording when U is greater than or equal to preset value 1 or less than or equal to preset value 2, wherein U can be current voltage collection value or average value in current voltage storage unit;

⑤ monitoring SOC₁When the SOC is₁When the value is more than or equal to or less than the corresponding preset value;

⑥ monitoring SOC₂When the SOC is₂When the value is more than or equal to or less than the corresponding preset value;

⑦ monitoring temperature value when the temperature value is greater than or equal to or less than corresponding preset value;

⑧ monitoring timer T_sWhen T is_sWhen the value is more than or equal to a certain preset value;

of course, the condition for starting data recording may include, but is not limited to, one of the above examples, a combination of multiple data, or other conditions, and may be set by a person skilled in the art according to an actual situation, and the embodiment of the present invention is not limited to this specifically.

(2) And starting data recording if the current relevant parameters meet the data recording conditions. The process of data recording can be described as follows:

① the data of 1 st storage area is transferred to the 2 nd storage area, the data of 2 nd storage area is transferred to the 3 rd storage area, the data of … … x th storage area is transferred to the x +1 th storage area, the data of … … N-1 st storage area is transferred to the N th storage area, and the data of the N th storage area is discarded.

② reading Coulomb meter Q value and SOC₂The value of timer Ts is read and recorded in the 1 st storage area.

③ the timer Ts is cleared and the timing is restarted.

(3) The short-circuit current can be calculated by a short-circuit current calculating unit, and the calculation process is as follows:

① reading the value of Q of coulometer, Q_maxValue, SOC₂Value and timer T_sA value of (d);

② reading the value Q of the Nth storage interval_N、SOC_2-N；

③ read the time values of all storage intervals,comprising T_s-1、T_s-2、……T_s-N；

④ calculating the short-circuit current (I)_{Short circuit}) At this time, the corresponding calculation formula is:

I_{short circuit}＝((SOC₂-SOC_2-N)*Q_max-(Q-Q_N))/(T_s+T_s-1+T_s-2+……+T_s-N) Wherein (Q-Q)_N) Is the actual capacity of the battery, (SOC)₂-SOC_2-N)*Q_maxIs the depleted capacity of the battery.

Further, the detection device may perform risk judgment according to the magnitude of the short-circuit current to determine a corresponding measure, or the detection device may also transmit the magnitude of the short-circuit current to a corresponding functional module in the terminal for processing.

Specifically, the detection device may detect the short-circuit current value (I) when the risk determination is performed_{Short circuit}) In contrast to a set threshold value (e.g. Is), if I_{Short circuit}If the current Is less than or equal to Is, returning a value of 0, and judging the safety of the battery cell; if I_{Short circuit}Is or more, the value I Is returned_{Short circuit}And judging that the battery core is risky. Wherein, Is can be as required degree of early warning, can set to different values, simultaneously, also can set up a plurality of Is values as required, carries out risk judgement to the risk degree.

In the embodiment of the present invention, if it is determined that the short-circuit current is greater than or equal to the first current threshold, the detection device switches the battery to the non-operating state and/or outputs warning information, for example, the battery is turned off by a corresponding control switch, and/or a warning information such as a buzzer or an alarm is turned on, as shown in fig. 3, which is a flowchart of a method for detecting a short circuit in the battery by the detection device. It should be noted that, in the flow shown in fig. 3, the process of calculating the actually used capacity Q1 and the process of calculating the consumed capacity Q2 may be performed simultaneously or non-simultaneously, and the specific calculation order may be determined according to actual needs. In the embodiment of the invention, the sequence of calculating Q1 and Q2 does not influence the judgment result of whether the battery is internally short-circuited.

The current threshold may be set according to a plurality of historical short-circuit currents, where the plurality of historical short-circuit currents are short-circuit currents corresponding to the recorded internal short-circuit of the battery before the current time.

Specifically, the detection device may analyze a normal distribution of the recorded plurality of historical short-circuit currents, determine a mean (u) and a standard deviation (σ) corresponding to the normal distribution, and determine the first threshold current from the mean and the standard deviation.

For example, the detection device records data of short-circuit currents of 32 internal short circuits, and determines a mean value u and a standard deviation (σ) corresponding to the 32 short-circuit currents through analysis of a normal distribution, so that u +3 ×, σ or u +1 ×, σ may be set as the first current threshold, for example, the set first current threshold may be 200 mA. It is considered that if the short-circuit current of the battery exceeds the first current threshold, the battery is very vulnerable to fire or explosion during use. Accordingly, the second current threshold may be determined according to the first current threshold and the actual requirement, and may be, for example, 50mA, 30mA or other values smaller than the first current threshold, which is not limited in this embodiment of the present invention.

Then, after the detection device determines that the battery has an internal short circuit and calculates the short-circuit current, if the short-circuit current is determined to exceed the first current threshold (e.g., 200mA), the detection device may directly turn off the battery, prohibit the battery from being used continuously, and simultaneously output a corresponding alarm prompt, such as a buzzer or an alarm, so as to avoid accidents such as fire and explosion of the battery.

Optionally, in another embodiment of the present invention, if it is determined that the short-circuit current is smaller than the first current threshold and greater than or equal to the second current threshold, and the second current threshold is smaller than the first current threshold, a warning message may be output, please refer to fig. 3.

For example, if it is determined that the short-circuit current is less than the first current threshold (e.g., 200mA) but greater than or equal to the second current threshold (e.g., 30mA), indicating that the short-circuit condition in the battery is not serious, but there is a certain risk of continuing to use the battery, at this time, a corresponding prompt message, such as an indicator light and/or a voice prompt, may be output.

Further, in the case that it is determined that the short circuit condition in the battery is not serious, a plurality of levels may be provided, and each level may have a corresponding processing measure, and then the detection device may determine the corresponding processing measure according to the level at which the magnitude of the short circuit current is located.

For example, the detection device may divide (200mA, 30mA) into three levels, including level I (200mA, 130 mA), level II (130mA, 80 mA), and level III (80mA, 30mA), each level corresponding to a respective indication mode, wherein level I corresponds to an audible indication (e.g., buzzer, voice warning, etc.) and an indicator light indication (e.g., flashing), level II corresponds to an audible indication, and level III corresponds to an indicator light or text indication.

Then, when the short-circuit current is 170mA, the detection device may output a corresponding prompting sound and an indicator light prompt, for example, output a voice prompt "battery is abnormal, please use caution", and simultaneously turn on a red indicator light or even control the indicator light to flash. When the short-circuit current is 100mA, an alarm prompt sound and the like can be output.

Therefore, by judging the magnitude of the short-circuit current, corresponding prompt can be carried out according to the serious condition of the internal short circuit, the method is helpful for improving the alertness of a user, effectively reducing safety accidents caused by using the internal short-circuited battery and improving the safety of the battery.

Further, after the detection device determines the short-circuit current, the detection device may further perform normal distribution analysis by combining the currently determined short-circuit current and a plurality of historical short-circuit currents to dynamically update the first current threshold, so as to be used for the next short-circuit current judgment. For example, u +3 σ obtained from the current normal analysis is set as a new first current threshold for the next comparison with the short-circuit current.

Therefore, in the embodiment of the present invention, the detection device may dynamically update the current threshold through analysis of the currently calculated and historically recorded short-circuit current, which is helpful to improve the accuracy of the internal short-circuit severity determined according to the magnitude of the short-circuit current.

Example two

Based on the same inventive concept, fig. 4A is a detection apparatus provided in an embodiment of the present invention, which can be used to perform the method for detecting a short circuit in a battery shown in fig. 1. The detection device may comprise a detection unit 10 and a processing unit 20, wherein the processing unit 20 may be an MCU.

Optionally, the detection device may further include a switch unit 30, which is also shown in fig. 4A.

Specifically, the detecting unit 10 may be configured to detect battery parameters of the battery in the first time period, including internal resistance, voltage, state of charge, current, and the like of the battery.

The processing unit 20 may be connected to the detecting unit 10, and the processing unit 20 is configured to calculate a loss capacity and an actual usage capacity of the battery in the first time period according to the battery parameter, and calculate a battery capacity difference between the loss capacity and the actual usage capacity; and determining a judgment result indicating whether the battery has an internal short circuit or not according to the battery capacity difference value and a preset capacity difference value.

Optionally, the processing unit 20 is further specifically configured to: and if the battery capacity difference is larger than or equal to a preset capacity difference, determining that the battery has an internal short circuit.

Optionally, the detection apparatus further includes:

then, the processing unit 20 is further specifically configured to:

calculating the total battery capacity of the battery according to the historical battery parameters; according to the battery parameters, determining a first electric quantity state parameter corresponding to the battery at the starting time of the first time period and a second electric quantity state parameter corresponding to the ending time of the first time period;

Optionally, the processing unit 20 is further specifically configured to:

Optionally, the processing unit is further specifically configured to:

Optionally, if it is determined that the battery has an internal short circuit, the detection apparatus further includes:

Optionally, the detection apparatus further includes:

In practical applications, the detecting unit 10 may correspond to a detecting component in the detecting device, etc., the processing unit 20 may correspond to an MCU in the detecting device, and the switch unit may correspond to a control switch, wherein the detecting component may be integrated in the MCU, and a schematic diagram of a hardware corresponding to each unit may be as shown in fig. 4B.

In another embodiment of the present invention, if it is functional, the detecting device may include a current-voltage detecting unit, an impedance detecting unit, a first saturation calculating unit, a second saturation calculating unit, a short-circuit current calculating unit, and a risk judging unit; here, the current voltage detection unit, the impedance detection unit may correspond to the detection unit 10, the short-circuit current calculation unit and the risk judgment unit may correspond to the processing unit 20, and the first saturation calculation unit and the second saturation calculation unit may be functional units in the detection unit 10 or the processing unit 20.

Optionally, the detection device may further include a storage unit, and the storage unit may be used to store some fixed parameters or basic data burned in advance. For example, the detection device may have parameters such as an SOC-OCV curve, a temperature resistance change coefficient, and a battery aging coefficient stored therein. Furthermore, the storage unit may be further adapted to store the detected battery parameters.

Specifically, the current and voltage detection unit may be used to collect and record current and voltage, and the impedance detection unit may be used to test and record internal resistance (impedance), for a specific test and record process, please refer to corresponding contents in the first embodiment.

The first saturation calculation unit may be configured to determine a total battery capacity and a first state of charge parameter (first saturation) from an actual used capacity of the battery, the third state of charge parameter, and the fourth state of charge parameter; the second saturation calculation unit may be configured to calculate a second saturation (a second state of charge parameter) of the battery according to the first saturation of the battery, and determine a real capacity, i.e., a loss capacity, of the battery according to the first saturation, the second saturation and a total capacity of the battery.

The short-circuit current calculation unit can be used for calculating according to the acquired battery data and determining the short-circuit current in real time; the risk judgment unit may be configured to perform risk judgment on the terminal device. Please refer to the first embodiment for the process of determining the short-circuit current and the process of risk evaluation, which are not described herein again.

Fig. 4C is a schematic circuit structure diagram of the detection apparatus according to the embodiment of the present invention. The detection means may be a separate detection device or may be a component applied in the terminal. The detection device mainly comprises a processor (such as an MCU), a data collector, a sensor and a memory; in the figure, B1-B10 represent a plurality of batteries detected by the detection device, and Q1 and Q2 are both triodes and can be used for being in a conducting state or a blocking state according to the control of the MCU and functioning as a switch circuit.

In practical application, the data collector can collect relevant battery parameters of the battery, and the sensor can be a temperature sensor and is used for collecting the temperature of the environment where the battery is located so as to detect the change of the temperature of the battery core; the processor can process the data collected by the data collector and/or the sensor; the memory can store the acquired data and the data processing result, and can even pre-store corresponding inherent parameters. Specifically, please refer to the foregoing description of the functional units of the detection apparatus for the corresponding functions of each component of the detection apparatus, and for the sake of brevity of the description, the detailed description is omitted here.

EXAMPLE III

Based on the same inventive concept, fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention, which may include a battery 21, a detection device 22, and a processor 23.

Among them, the battery 21 may be a secondary battery, such as a lithium ion battery. The battery 21 may provide power for functional components in the terminal.

The detection device 22 may be connected to the battery 21 for detecting a battery parameter of the battery 21 during a first time period. For the process of determining whether the internal short circuit is detected by the detection device 22 according to the detection data, please refer to the description of the related contents in the first embodiment, which is not described herein again.

The processor 23 is connected with the detection device 22 and is used for calculating the loss capacity and the actual use capacity of the battery 21 in the first time period according to the battery parameters; calculating a battery capacity difference between the lost capacity and the actual used capacity; and determining a judgment result indicating whether the battery has an internal short circuit or not according to the battery capacity difference value and a preset capacity difference value, and outputting a corresponding control instruction according to a detection result.

In practical applications, if the processor 23 determines that the battery capacity difference is greater than or equal to the preset capacity difference, it is determined that the internal short circuit occurs in the battery 21, and otherwise, it is determined that the internal short circuit does not exist in the battery 21. If the detection result indicates that there is an internal short circuit in the battery 21, the processor 23 may output a corresponding control instruction, such as a control instruction for turning off a battery switch, or an instruction for activating an alarm, etc., to prompt the user to continue using the battery 21.

Example four

In an embodiment of the present invention, a terminal is further provided, which is configured as shown in fig. 6, and the terminal includes a processor 31 and a memory 32, where the processor 31 is configured to implement the steps of the method for detecting a short circuit in a battery provided in the first embodiment of the present invention when executing a computer program stored in the memory 32.

Optionally, the processor 31 may specifically be a central processing unit, an Application Specific Integrated Circuit (ASIC), one or more Integrated circuits for controlling program execution, a hardware Circuit developed by using a Field Programmable Gate Array (FPGA), or a baseband processor.

Optionally, the processor 31 may include at least one processing core.

Optionally, the terminal further includes a Memory 32, and the Memory 32 may include a Read Only Memory (ROM), a Random Access Memory (RAM), and a disk Memory. The memory 32 is used for storing data required by the processor 31 in operation. The number of the memory 32 is one or more.

EXAMPLE five

The embodiment of the present invention further provides a readable storage medium, where the readable storage medium stores computer instructions, and when the computer instructions are executed on a terminal (e.g., a computer), the steps of the method for detecting a short circuit in a battery according to the first embodiment of the present invention may be implemented.

In the embodiments of the present invention, it should be understood that the disclosed method, apparatus, terminal and readable storage medium for detecting short circuit in battery may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical or other form.

The functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be an independent physical module.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the technical solutions of the embodiments of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device, such as a personal computer, a server, or a network device, or a Processor (Processor), to execute all or part of the steps of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a Universal Serial Bus flash drive (USB), a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk.

The above embodiments are only used to describe the technical solutions of the present invention in detail, but the above embodiments are only used to help understanding the method of the embodiments of the present invention, and should not be construed as limiting the embodiments of the present invention. Variations or substitutions that may be readily apparent to one skilled in the art are intended to be included within the scope of the embodiments of the present invention.

Claims

1. A method of detecting a short circuit in a battery, comprising:

detecting a battery parameter of the battery over a first period of time;

2. The method of claim 1, wherein the step of determining a determination result indicating whether the battery has an internal short circuit according to the battery capacity difference and a preset capacity difference comprises:

3. The method of claim 1 or 2, further comprising, prior to calculating a consumed capacity and an actual used capacity of the battery over the first time period based on the battery parameters:

4. The method of claim 3, wherein said step of calculating said lost capacity based on said first state of charge parameter, said second state of charge parameter, and said total battery capacity comprises:

5. The method of claim 1 or 2, wherein said step of calculating said actual capacity of said battery based on said battery parameters comprises:

6. The method of claim 2, further comprising:

7. The method of claim 6, further comprising:

obtaining a plurality of historical short-circuit currents;

8. A detection device, comprising:

9. The detection apparatus of claim 8, wherein the processing unit is further to:

10. The detection apparatus according to claim 8 or 9, wherein the detection apparatus further comprises:

then, the processing unit is further configured to:

11. The detection apparatus of claim 10, wherein the processing unit is further configured to:

12. The detection apparatus according to claim 8 or 9, wherein the processing unit is further configured to:

13. The detection device of claim 9, further comprising:

14. The detection device of claim 13, further comprising:

15. A terminal, comprising:

a battery;

the detection device is connected with the battery and is used for detecting the battery parameters of the battery in a first time period; and

the processor is connected with the detection device and used for calculating the loss capacity and the actual use capacity of the battery in the first time period according to the battery parameters; calculating a battery capacity difference between the lost capacity and the actual used capacity; and determining a judgment result indicating whether the battery has an internal short circuit according to the battery capacity difference and a preset capacity difference, and outputting a corresponding control instruction according to the judgment result.

16. A terminal, characterized in that it comprises a processor for implementing the method according to any one of claims 1-7 when executing a computer program stored in a memory.

17. A readable storage medium, characterized in that it stores computer instructions which, when run on a terminal, cause the terminal to perform the method according to any one of claims 1-7.