CN111624508A - Battery short circuit detection method and device - Google Patents

Abstract

The application provides a battery short circuit detection method and a battery short circuit detection device, wherein the method comprises the following steps: acquiring the voltage of the battery, and calculating the voltage variation of the battery in the current preset time period, wherein the voltage variation of the battery is caused by the fact that the current variation of the battery acts on the direct current internal resistance of the battery; the battery is subjected to short circuit detection according to the voltage variation of the battery, so that the battery short circuit abnormity can be judged quickly and accurately on the premise of not increasing the cost of the battery management module, and the safety of the battery is improved.

Description

Battery short circuit detection method and device

technical field

The present application relates to the technical field of batteries, and in particular, to a method and device for short-circuit detection of batteries.

Background technique

During the use of the battery, if it encounters severe conditions such as drop and acupuncture, it is very likely that an abnormality such as a battery short circuit will occur. However, the related technology does not have suitable methods and means to accurately detect such anomalies in the battery in a timely manner.

Application content

The present application aims to solve one of the technical problems in the related art at least to a certain extent.

To this end, the present application proposes a method and device for short-circuit detection of a battery, which can quickly and accurately determine whether a battery short-circuit is abnormal without increasing the cost of a battery management module.

An embodiment of the first aspect of the present application proposes a method for detecting a short circuit of a battery, including the following steps: acquiring the voltage of the battery, and calculating the voltage variation of the battery in a current preset time period, wherein; The short circuit detection of the battery is performed according to the voltage variation of the battery.

According to the short-circuit detection method of the battery proposed in the embodiment of the present application, the voltage variation of the battery is obtained, and then the short-circuit detection of the battery is performed according to the voltage variation of the battery. Accurately determine the abnormality of the battery short circuit and improve the safety of the battery.

According to an embodiment of the present application, the change of the load current of the battery acts on the DC internal resistance of the battery to cause the change of the load voltage of the battery, wherein the change direction of the load current of the battery is opposite to the change direction of the load voltage of the battery .

According to an embodiment of the present application, the battery is not short-circuited, and the voltage variation of the battery is a first voltage variation, wherein the difference between the first voltage variation and the theoretical voltage variation is less than a tolerance The theoretical voltage variation is the product of the current variation of the battery and the DC internal resistance of the battery.

According to an embodiment of the present application, the battery is short-circuited, and the voltage variation of the battery is a second voltage variation, wherein the second voltage variation is the superposition of the voltage variation when the battery is not short-circuited The amount of voltage change caused by a short circuit.

A method for short-circuit detection of a battery proposed by an embodiment of the second aspect of the present application includes the following steps: acquiring the current of the battery, and calculating the current variation of the battery in a current preset time period; The current variation determines the reference voltage variation range; obtains the voltage of the battery, and calculates the battery voltage variation within the current preset time period; determines that the battery voltage variation exceeds the reference voltage variation range ; judge that the battery is short-circuited.

According to the short-circuit detection method of the battery proposed in the embodiment of the present application, the current variation of the battery is obtained, and the reference voltage variation range is determined according to the current variation of the battery, and then the voltage variation of the battery is obtained, and the voltage variation of the battery is obtained according to the voltage variation of the battery. The short-circuit detection of the battery is carried out according to the variation range of the reference voltage and the reference voltage, so that the battery can quickly and accurately determine the abnormality of the short-circuit of the battery without increasing the cost of the battery management module, thereby improving the safety of the battery.

According to an embodiment of the present application, the method for detecting a short circuit of a battery further includes: determining that the voltage variation of the battery exceeds the reference voltage variation range; and judging that the battery is short-circuited.

According to an embodiment of the present application, the obtaining the reference voltage variation range includes: obtaining the current variation of the battery; calculating the obtaining reference according to the current variation of the battery, the DC internal resistance and the tolerance value of the battery Voltage variation range.

According to an embodiment of the present application, the method for detecting a short circuit of a battery further includes: calculating an internal short-circuit current of the battery according to a voltage variation of the battery and a current variation of the battery.

A battery short-circuit detection device proposed by an embodiment of the third aspect of the present application includes: an acquisition module for acquiring the voltage of the battery and calculating the voltage change of the battery in a current preset time period; a detection module , for short-circuit detection of the battery according to the voltage variation of the battery.

According to the battery short-circuit detection device proposed in the embodiment of the present application, the acquisition module acquires the voltage variation of the battery, and then the detection module performs short-circuit detection on the battery according to the voltage variation of the battery, thereby achieving the premise of not increasing the cost of the battery management module It can quickly and accurately judge the abnormal short circuit of the battery and improve the safety of the battery.

A battery short-circuit detection device proposed in an embodiment of the fourth aspect of the present application includes: an acquisition module, configured to acquire the voltage of the battery, calculate the voltage change of the battery in the current preset time period, and acquire the current of the battery, and calculate the current variation of the battery in the current preset time period; the detection module is used to determine the reference voltage variation range according to the current variation of the battery, and determine the battery When the variation of the voltage exceeds the variation range of the reference voltage, it is determined that the battery is short-circuited.

According to the short-circuit detection device of the battery proposed in the embodiment of the present invention, the acquisition module acquires the voltage variation of the battery, and acquires the current variation of the battery, the detection module determines the reference voltage variation range according to the current variation of the battery, and determines the reference voltage variation range according to the battery voltage variation The short-circuit detection of the battery is carried out according to the amount and the variation range of the reference voltage, so that the battery can quickly and accurately judge the abnormality of the battery short-circuit and improve the safety of the battery without increasing the cost of the battery management module.

A battery short-circuit detection device proposed by an embodiment of the fifth aspect of the present application includes a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the program, the above-mentioned program is implemented. A method for detecting a short circuit of a battery according to an embodiment of the first aspect.

According to the short-circuit detection device of the battery proposed by the embodiment of the present invention, it can quickly and accurately determine the abnormality of the battery short-circuit and improve the safety of the battery without increasing the cost of the battery management module.

A short-circuit detection device for a battery proposed by an embodiment of the sixth aspect of the present application includes a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the program, the above-mentioned program is implemented. A method for detecting a short circuit of a battery according to an embodiment of the second aspect.

According to the short-circuit detection device of the battery proposed by the embodiment of the present invention, it can quickly and accurately determine the abnormality of the battery short-circuit and improve the safety of the battery without increasing the cost of the battery management module.

A computer-readable storage medium provided by an embodiment of the sixth aspect of the present application stores a computer program thereon, and when the program is executed by a processor, implements the battery short-circuit detection method of the foregoing first aspect embodiment.

A computer-readable storage medium provided by an embodiment of the sixth aspect of the present application stores a computer program thereon, and when the program is executed by a processor, implements the battery short-circuit detection method of the foregoing second aspect embodiment.

Additional aspects and advantages of the present application will be set forth, in part, in the following description, and in part will be apparent from the following description, or learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a schematic flowchart of a short-circuit detection method for a battery according to an embodiment of the present application;

FIG. 2 is a schematic diagram of the principle of an equivalent circuit model of a battery according to an embodiment of the present application;

FIG. 3 is a schematic diagram of the principle of the load voltage change caused by the load current according to an embodiment of the present application;

4 is a schematic diagram of a change curve of load current and load voltage according to an embodiment of the present application;

5 is a schematic diagram of a relationship curve between DC internal resistance and temperature according to an embodiment of the present application;

6 is a schematic flowchart of a short-circuit detection method for a battery according to another embodiment of the present application;

7 is a schematic diagram of a change curve of a load voltage of a battery under acupuncture according to another embodiment of the present application;

8 is a schematic diagram of a change curve of a load voltage of a battery under a drop condition according to another embodiment of the present application;

9 is a schematic block diagram of a short circuit detection device for a battery according to an embodiment of the present application;

10 is a schematic block diagram of a short circuit detection device for a battery according to another embodiment of the present application;

FIG. 11 is a schematic block diagram of a short circuit detection device for a battery according to still another embodiment of the present application.

Detailed ways

The following describes in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present application, but should not be construed as a limitation to the present application.

The method and device for short-circuit detection of a battery according to the embodiments of the present application will be described below with reference to the accompanying drawings.

According to FIG. 1 to FIG. 4 , an embodiment of the first aspect of the present application proposes a method for detecting a short circuit of a battery. As shown in FIG. 1 , the short-circuit detection method of the battery according to the embodiment of the present application includes the following steps:

S101: Acquire the voltage of the battery, and calculate the voltage variation of the battery in the current preset time period.

Among them, the change of the load current of the battery acts on the DC internal resistance of the battery, causing the load voltage of the battery to change.

In some embodiments of the present application, the equivalent circuit model of the battery may be as shown in FIG. 2 , where Uoc=UL+Ro×IL+Up, Uoc is the open circuit voltage, Ro is the DC internal resistance, and Rp is the polarization resistance , Cp is the polarization capacitance, Up is the polarization voltage, IL is the load current, and UL is the load voltage. It should be noted that the load current IL is the current provided by the battery to the load detected by the current detection unit. For example, the load current of the battery can be sampled and detected through a current-sense resistor and a galvanometer. The load voltage UL is the voltage applied to the load by the battery detected by the voltage detection unit, for example, the load voltage of the battery can be sampled by means of voltage division in series.

It should be understood that, as shown in Figure 3, when the load current of the battery changes suddenly, for example, when IL changes from IL1 to IL2, the load voltage of the battery changes, for example, UL can change from UL1 to UL2, according to the model Uoc=UL in Figure 2 It can be seen from +Ro×IL+Up that Uoc and Up will not mutate instantaneously. Furthermore, for the model Uoc=UL+Ro×IL+Up in FIG. 2 , the following relationship is satisfied:

Uoc=UL1+Ro×IL1+Up=UL2+Ro×IL2+Up;

Transforming UL1+Ro×IL1+Up=UL2+Ro×IL2+Up can get:

(UL1–UL2)=Ro×(IL1–IL2),

It can be seen that the instantaneous current change acting on the DC internal resistance of the battery can cause the corresponding voltage change.

It should be understood that in this embodiment of the present application, the changing direction of the current of the battery is opposite to the changing direction of the voltage of the battery, wherein the changing direction of the current may include an increase in the battery and a decrease in the battery, and the changing direction of the voltage may include an increase in the voltage and a decrease in the voltage decrease. That is to say, the change direction of the current of the battery is opposite to the change direction of the voltage of the battery. It can mean that when the current changes in the direction of increasing current, the voltage changes in the direction of decreasing voltage, and when the current changes in the direction of decreasing current , the voltage changes in the direction of increasing voltage.

According to the example in Figure 4-5, verify the corresponding voltage change caused by the current change acting on the DC internal resistance of the battery, perform 1A/2A switching and discharge on the battery in a normal temperature environment at intervals of 1S, and collect the voltage, current value, and voltage and current changes. The curve is shown in Figure 4; at this moment, as shown in Figure 5, the corresponding impedance of the battery is 53mΩ. The theoretical voltage change calculated by ΔU=Ro×ΔI is ΔU=Ro×ΔI=53×1=53mV, the actual detected voltage change is 50mV, assuming the tolerance value is ±5mv, the actual detected voltage change is within the theoretical The voltage change is within the tolerance value range (53±5mv), which means that the current change acting on the DC internal resistance of the battery can cause the corresponding voltage change to be established.

It should be noted that if the temperature of the battery does not change suddenly, the DC internal resistance Ro from full to emptying will not change suddenly. Specifically, the DC internal resistance Ro of the battery can be experimentally modeled and updated by real-time learning, and can be obtained in advance.

Specifically, in this embodiment, the voltage of the battery may refer to the battery load voltage, and calculating the voltage variation of the battery in the current preset time period may include: acquiring the battery load voltage U(te) at the end time of the current preset time period , obtain the battery load voltage U(ts) at the start time of the current preset time period; calculate the difference between the battery load voltage U(te) at the end time and the battery load voltage U(ts) at the start time to obtain the battery The voltage variation of , namely ΔU'=U(te)-U(ts).

It should be noted that the time length t of the preset time period can be set according to the actual situation. Assuming that the current time is t1, then the current preset time period is the time period from time (t1-t) to time t1, where time (t1-t) is the starting time of the current preset time period, and time t1 is is the end time of the current preset time period. At this time, the voltage change of the battery between time t1 and time (t1-t) is calculated, and the voltage change of the battery in the current preset time period can be obtained. Among them, the battery The voltage change between time t1 and time (t1-t) is U(t1)-U(t1-t), U(t1) is the battery load voltage at time t1, and U(t1-t) is time ( t1-t) battery load voltage.

S102: Perform short-circuit detection on the battery according to the voltage variation of the battery.

That is to say, in the embodiment of the present application, it can be determined whether the battery is short-circuited according to the voltage change of the battery.

It should be understood that the voltage of the battery changes because the current change of the battery acts on the DC internal resistance of the battery. Therefore, it can be determined whether the battery is short-circuited by analyzing the voltage change of the battery.

Specifically, the battery is not short-circuited, the voltage variation of the battery is the first voltage variation, wherein the difference between the first voltage variation and the theoretical voltage variation is less than the tolerance value, and the theoretical voltage variation is the current variation of the battery The product of the amount and the DC internal resistance of the battery. For example, when the battery is not short-circuited, the voltage change of the battery changes within the tolerance value range of the product of the current change of the battery and the DC internal resistance of the battery, where the tolerance value is ±u (u can take the aforementioned 5mV ), that is, the range of the first voltage variation is (Ro×ΔI±u).

When the battery is short-circuited, the voltage variation of the battery is the second voltage variation, wherein the second voltage variation is the voltage variation when the battery is not short-circuited superimposed on the short-circuit-induced voltage variation. For example, when the battery is short-circuited, the voltage change of the battery is the voltage change when the battery is not short-circuited superimposed on the voltage change caused by the short-circuit, where the voltage change when the battery is not short-circuited is (Ro×ΔI±u) within the range.

That is, when the battery is normal, that is, no short circuit occurs, the voltage variation is within the tolerance value range of the theoretical voltage variation, where the theoretical voltage variation ΔU=Ro×ΔI. When the battery goes from normal to short circuit, an instantaneous short current is generated, and the voltage change ΔU1 generated by the instantaneous short current will be superimposed on the basis of the normal voltage change ΔU. The voltage variation will exceed the tolerance range (ΔU±u) of the voltage variation.

Thus, the voltage variation ΔU' of the battery is detected in real time, and compared with the tolerance value range (ΔU±u) of the theoretical voltage variation. If the real-time voltage variation ΔU' is within the range of (ΔU±u), the battery is normal; if the real-time voltage variation ΔU' is outside the range of (ΔU±u), the battery is short-circuited.

It should be understood that "the voltage change amount ΔU' is within the range of (ΔU±u)" includes that ΔU' is greater than or equal to the smaller value of ΔU+u and ΔU-u and less than or equal to the larger value of ΔU+u and ΔU-u ; "The voltage change amount ΔU' is outside the range of (ΔU±u)" includes that ΔU' is larger than the larger value of ΔU+u and ΔU-u or ΔU' is smaller than the smaller value of ΔU+u and ΔU-u.

It should be noted that the battery short-circuit detection method proposed in the embodiments of the present application is applicable to devices with batteries, such as electronic devices (such as mobile phones, tablet computers, wearable devices, etc.), vehicles, etc., and can be applied to various working conditions Short-circuit detection under the condition of mobile phone shutdown, such as short-circuit detection of mobile phone shutdown condition, short-circuit detection of mobile phone startup condition, short-circuit detection of APP (application) use condition, and short-circuit detection of mobile phone screen-off condition, etc., can be accurately and timely detected under various working conditions. Abnormal short circuit of the battery.

In summary, according to the battery short-circuit detection method proposed in the embodiments of the present application, the voltage variation of the battery is obtained, and then the short-circuit detection of the battery is performed according to the voltage variation of the battery, so as to achieve the premise of not increasing the cost of the battery management module , can quickly and accurately determine the abnormal short circuit of the battery, and improve the safety of the battery.

According to FIG. 6 to FIG. 8 , an embodiment of the second aspect of the present application proposes a method for detecting a short circuit of a battery.

As shown in FIG. 6 , the short-circuit detection method of the battery according to the embodiment of the present application includes the following steps:

S201: Obtain the current of the battery, and calculate the current variation of the battery in the current preset time period.

Specifically, in this embodiment, the current of the battery may refer to the battery load current, and calculating the current variation of the battery in the current preset time period may include: acquiring the battery load current I(te) at the end time of the current preset time period , obtain the battery load current I(ts) at the start time of the current preset time period; calculate the difference between the battery load current I(te) at the end time and the battery load current I(ts) at the start time to obtain the battery The current variation of ΔI'=I(te)-I(ts).

It should be noted that the time length t of the preset time period can be set according to the actual situation. Assuming that the current time is t1, then the current preset time period is the time period from time (t1-t) to time t1, where time (t1-t) is the starting time of the current preset time period, and time t1 is is the end time of the current preset time period. At this time, the current change of the battery between time t1 and time (t1-t) is calculated, and the current change of the battery in the current preset time period can be obtained. Among them, the battery The current variation between time t1 and time (t1-t) is I(t1)-U(t1-t), I(t1) is the battery load current at time t1, and I(t1-t) is time ( t1-t) battery load current.

Among them, the battery load current can be detected through the sampling resistor.

S202: Determine the reference voltage variation range according to the current variation of the battery.

Specifically, determining the reference voltage variation range according to the battery current variation includes: calculating the theoretical voltage variation according to the battery current variation and the battery's DC internal resistance; determining and obtaining the reference voltage variation range according to the theoretical voltage variation and tolerance value.

It should be understood that the theoretical voltage variation refers to the voltage variation calculated by the theoretical formula as ΔU=Ro×ΔI mentioned below. The tolerance value refers to the amplitude of the fluctuation of the theoretical voltage variation, such as ±u. The reference voltage variation range is the voltage variation range formed by fluctuating the tolerance value on the basis of the theoretical voltage variation, and the reference voltage variation range is used as a reference for judging whether the battery is short-circuited.

Specifically, the equivalent circuit model of the battery can be shown in Figure 2, where Uoc=UL+Ro×IL+Up, Uoc is the open circuit voltage, Ro is the DC internal resistance, Rp is the polarization resistance, and Cp is the polarization capacitance , Up is the polarization voltage, IL is the load current, and UL is the load voltage. It should be noted that the load current IL is the current provided by the battery to the load detected by the current detection unit. For example, the load current of the battery can be sampled and detected through a current-sense resistor and a galvanometer. The load voltage UL is the voltage applied to the load by the battery detected by the voltage detection unit, for example, the load voltage of the battery can be sampled by means of voltage division in series.

It should be understood that, as shown in Figure 3, when the load current of the battery changes suddenly, for example, when IL changes from IL1 to IL2, the load voltage of the battery changes, for example, UL can change from UL1 to UL2, according to the model Uoc=UL in Figure 2 It can be seen from +Ro×IL+Up that Uoc and Up will not mutate instantaneously. Furthermore, for the model Uoc=UL+Ro×IL+Up in FIG. 2 , the following relationship is satisfied:

Uoc=UL1+Ro×IL1+Up=UL2+Ro×IL2+Up;

Transforming UL1+Ro×IL1+Up=UL2+Ro×IL2+Up can get:

(UL1–UL2)=Ro×(IL1–IL2),

It can be seen that the instantaneous current change acting on the DC internal resistance of the battery can cause the corresponding voltage change.

Therefore, the theoretical voltage variation is ΔU=Ro×ΔI, the tolerance value is ±u (u can be 5mV), and the reference voltage variation range is the tolerance value range of the product of the battery’s current variation and the battery’s DC internal resistance (Ro ×ΔI±u).

In the embodiment of the present application, the change direction of the current of the battery is opposite to the change direction of the voltage of the battery. That is, when the current increases, the voltage decreases, and when the current decreases, the voltage increases.

It should also be noted that, if the temperature of the battery does not change suddenly, the DC internal resistance Ro from full to emptying will not change suddenly. Specifically, the DC internal resistance Ro of the battery can be experimentally modeled and updated by real-time learning, and can be obtained in advance.

S203: Acquire the voltage of the battery, and calculate the voltage variation of the battery in the current preset time period.

Specifically, in this embodiment, the voltage of the battery may refer to the battery load voltage, and calculating the voltage variation of the battery in the current preset time period may include: acquiring the battery load voltage U(te) at the end time of the current preset time period , obtain the battery load voltage U(ts) at the start time of the current preset time period; calculate the difference between the battery load voltage U(te) at the end time and the battery load voltage U(ts) at the start time to obtain the battery The voltage variation of , namely ΔU'=U(te)-U(ts).

It should be noted that the time length t of the preset time period can be set according to the actual situation. Assuming that the current time is t1, then the current preset time period is the time period from time (t1-t) to time t1, where time (t1-t) is the starting time of the current preset time period, and time t1 is is the end time of the current preset time period. At this time, the voltage change of the battery between time t1 and time (t1-t) is calculated, and the voltage change of the battery in the current preset time period can be obtained. Among them, the battery The voltage change between time t1 and time (t1-t) is U(t1)-U(t1-t), U(t1) is the battery load voltage at time t1, and U(t1-t) is time ( t1-t) battery load voltage.

Among them, the battery load voltage can be detected through a voltage divider resistor.

S204: Determine that the voltage variation of the battery exceeds the reference voltage variation range.

S205: It is judged that the battery is short-circuited.

That is to say, in the embodiment of the present application, whether the battery is short-circuited can be determined according to the voltage change amount and the reference voltage change range of the battery.

It should be understood that when the load current changes, for example, from IL1 to IL2, the current change ΔI' can be detected in real time. According to the change relationship: ΔU=Ro×ΔI, the DC internal resistance Ro is known, and the theoretical voltage change ΔU= R×ΔI, at the same time, the voltage change ΔU caused by the change of the load current can be detected in real time, for example, the load voltage UL1 changes to UL2, assuming that the comprehensive error of the system, that is, the tolerance value is u, the actual detected voltage change ΔU under normal conditions ' should be in the (ΔU±u) interval. Thus, by comparing the actual voltage variation of the battery with the reference voltage variation range, it can be determined whether the battery is short-circuited.

Specifically, according to an embodiment of the present application, the method for detecting a short circuit of a battery further includes: determining that the voltage variation of the battery cell does not exceed a reference voltage variation range, and judging that the battery cell is not short-circuited.

It should be understood that the voltage of the battery changes because the current change of the battery acts on the DC internal resistance of the battery. Therefore, it can be determined whether the battery is short-circuited by analyzing the voltage change of the battery. Specifically, when the battery is not short-circuited, the voltage variation of the battery varies within the tolerance value range of the product of the current variation of the battery and the DC internal resistance of the battery, where the tolerance value is ±u (u can be the aforementioned 5mV), the tolerance range of the product of the battery’s current variation and the battery’s DC internal resistance is (Ro×ΔI±u). When the battery is short-circuited, the voltage change of the battery includes the voltage change when the battery is not short-circuited superimposed on the voltage change caused by the short-circuit, where the voltage change when the battery is not short-circuited is within the range of (Ro×ΔI±u) .

That is, when the battery is normal, that is, no short circuit occurs, the voltage variation is within the tolerance value range of the theoretical voltage variation, where the theoretical voltage variation ΔU=Ro×ΔI. However, as shown in Figures 7 and 8, acupuncture and dropping the battery will cause an instant short circuit, and the load voltage of the battery will drop instantly. Among them, the battery is short-circuited, and the rupture of the battery diaphragm causes the positive and negative electrodes of the battery to short-circuit to generate current, causing the battery voltage to drop instantly. Therefore, when the battery goes from normal to short circuit, the voltage change ΔU1 generated by the short current in an instant will be superimposed on the basis of the normal voltage change ΔU. When a short circuit occurs, the actual voltage change after the superposition of ΔU+ΔU1 will exceed The tolerance value range of voltage variation (ΔU±u).

Based on this, in the application embodiment, the voltage variation ΔU' of the battery is detected in real time, and compared with the tolerance value range (ΔU±u) of the theoretical voltage variation. If the real-time voltage variation ΔU' is within the range of (ΔU±u), the battery is normal; if the real-time voltage variation ΔU' is outside the range of (ΔU±u), the battery is short-circuited.

It should be understood that "the voltage change amount ΔU' is within the range of (ΔU±u)" includes that ΔU' is greater than or equal to the smaller value of ΔU+u and ΔU-u and less than or equal to the larger value of ΔU+u and ΔU-u ; "The voltage change amount ΔU' is outside the range of (ΔU±u)" includes that ΔU' is larger than the larger value of ΔU+u and ΔU-u or ΔU' is smaller than the smaller value of ΔU+u and ΔU-u.

Therefore, without increasing the cost of the battery management module, it is possible to quickly and accurately determine whether the battery is short-circuited abnormally, thereby improving the safety of the battery.

Further, according to an embodiment of the present application, the method for detecting a short circuit of a battery further includes: calculating an internal short-circuit current of the battery according to the voltage variation of the battery and the current variation of the battery.

Specifically, the internal short instantaneous current of the battery can be calculated according to the following formula:

Is=ΔU’/Ro-ΔI

Among them, Is is the internal short-term instantaneous current of the battery, ΔU' is the detected voltage variation, ΔI is the detected current variation, and Ro is the DC impedance value.

Further, in some embodiments of the present application, after calculating the internal short instantaneous current Is of the battery, the internal short instantaneous current Is of the battery can be displayed, for example, displaying the specific value of the internal short instantaneous current Is, so as to facilitate Users can intuitively understand the short circuit of the battery.

In other embodiments of the present application, after calculating the internal short instantaneous current Is of the battery, a corresponding internal short protection strategy can also be determined according to the internal short instantaneous current Is of the battery. control strategy, and then perform short-circuit protection according to the corresponding internal short protection strategy. For example, when the internal short instantaneous current Is is less than the preset current value, short-circuit protection is not performed, and when the internal short instantaneous current Is is greater than or equal to the preset current value. , for short-circuit protection, such as disconnecting the output circuit of the battery, so that the battery stops supplying power to the load. Therefore, when the short-circuit condition is not serious, the battery can continue to discharge, maintain the normal operation of the device, and improve the user experience.

It should be noted that the battery short-circuit detection method proposed in the embodiments of the present application is applicable to devices with batteries, such as electronic devices (such as mobile phones, tablet computers, wearable devices, etc.), vehicles, etc., and can be applied to various working conditions Short-circuit detection under the condition of mobile phone shutdown, such as short-circuit detection of mobile phone shutdown condition, short-circuit detection of mobile phone startup condition, short-circuit detection of APP (application) use condition, and short-circuit detection of mobile phone screen-off condition, etc., can be accurately and timely detected under various working conditions. Abnormal short circuit of the battery.

To sum up, according to the short-circuit detection method of the battery proposed in the embodiment of the present application, the current variation of the battery is obtained, and the reference voltage variation range is determined according to the current variation of the battery, and then the voltage variation of the battery is obtained, and according to the battery's current variation, the reference voltage variation range is determined. The voltage variation and the reference voltage variation range are used to detect the short circuit of the battery, so that the battery management module can quickly and accurately determine the abnormality of the battery short circuit and improve the safety of the battery without increasing the cost of the battery management module.

In order to realize the above-mentioned embodiment of the first aspect, the present application also proposes a short-circuit detection device for a battery.

FIG. 9 is a schematic block diagram of a short circuit detection device for a battery according to an embodiment of the present application. As shown in FIG. 9 , the battery short circuit detection device includes an acquisition module 101 and a detection module 102 .

Wherein, the acquisition module 101 is used for acquiring the voltage of the battery and calculating the voltage variation of the battery in the current preset time period; the detection module 102 is used for short circuit detection of the battery according to the voltage variation of the battery.

According to an embodiment of the present application, the change of the load current of the battery acts on the DC internal resistance of the battery to cause the change of the load voltage of the battery, and the change direction of the load current of the battery is opposite to the change direction of the load voltage of the battery.

According to an embodiment of the present application, the battery is not short-circuited, and the voltage variation of the battery is the first voltage variation, wherein the difference between the first voltage variation and the theoretical voltage variation is less than the tolerance value, and the theoretical voltage variation is The product of the battery's current variation and the battery's DC internal resistance.

According to an embodiment of the present application, when the battery is short-circuited, the voltage variation of the battery is the second voltage variation, wherein the second voltage variation is the voltage variation when the battery is not short-circuited superimposed on the short-circuit-induced voltage variation.

It should be noted that the foregoing explanations of the embodiment of the battery short-circuit detection method are also applicable to the battery short-circuit detection device of this embodiment, and are not repeated here.

To sum up, according to the short-circuit detection device of the battery proposed in the embodiment of the present application, the acquisition module acquires the voltage variation of the battery, and then the detection module performs short-circuit detection on the battery according to the voltage variation of the battery, thereby realizing that the battery management module is not added. Under the premise of cost, it can quickly and accurately judge the abnormal short circuit of the battery, and improve the safety of the battery.

In order to realize the foregoing first aspect embodiment, the present application also proposes another short-circuit detection device for a battery, which includes a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the program, it realizes The method for detecting a short circuit of a battery according to the embodiment of the first aspect is described above.

In order to implement the foregoing first aspect embodiment, the present application further provides a computer-readable storage medium storing a computer program thereon, which implements the battery short-circuit detection method of the foregoing first aspect embodiment when the program is executed by a processor.

In order to realize the foregoing second aspect embodiment, the present application also proposes yet another short-circuit detection device for a battery.

FIG. 10 is a schematic block diagram of a short circuit detection device for a battery according to still another embodiment of the present application. As shown in FIG. 10 , the battery short circuit detection device includes an acquisition module 201 and a detection module 202 .

Wherein, the obtaining module 201 is used to obtain the voltage of the battery, and calculate the voltage variation of the battery within the current preset time period, and obtain the current of the battery, and calculate the current change of the battery within the current preset time period; The detection module 202 is configured to determine the reference voltage variation range according to the current variation of the battery, and determine that the battery is short-circuited when it is determined that the battery voltage variation exceeds the reference voltage variation range.

According to an embodiment of the present application, the detection module 202 is configured to determine that the battery is not short-circuited when it is determined that the voltage variation of the battery does not exceed the reference voltage variation range.

According to an embodiment of the present application, the detection module 202 is further configured to calculate the theoretical voltage variation according to the current variation of the battery and the DC internal resistance of the battery, and determine and obtain the reference voltage variation range according to the theoretical voltage variation and tolerance value.

According to an embodiment of the present application, as shown in FIG. 11 , the short-circuit detection device further includes a calculation module 203, which is configured to calculate the internal short-circuit current of the battery according to the voltage variation of the battery and the current variation of the battery.

According to an embodiment of the present application, the short-circuit detection device further includes a protection module, and the protection module performs short-circuit protection when it is determined that the internal short-circuit current of the battery is greater than or equal to a preset current value.

It should be noted that the foregoing explanations of the embodiment of the battery short-circuit detection method are also applicable to the battery short-circuit detection device of this embodiment, and are not repeated here.

To sum up, according to the short-circuit detection device of the battery proposed in the embodiment of the present invention, the acquisition module acquires the voltage variation of the battery, and acquires the current variation of the battery, the detection module determines the reference voltage variation range according to the current variation of the battery, and determines the reference voltage variation range according to the battery current variation. The short-circuit detection of the battery is carried out according to the voltage change amount and the reference voltage change range, so that the battery can quickly and accurately judge the abnormal short-circuit of the battery without increasing the cost of the battery management module, and improve the safety of the battery.

In order to realize the foregoing second aspect embodiment, the present application also proposes yet another short-circuit detection device for a battery, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the program, it realizes A method for detecting a short circuit of a battery according to an embodiment of the second aspect.

In order to implement the foregoing second aspect embodiment, the present application further provides a computer-readable storage medium storing a computer program thereon, which implements the battery short-circuit detection method of the foregoing second aspect embodiment when the program is executed by a processor.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless expressly and specifically defined otherwise.

Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing custom logical functions or steps of the process , and the scope of the preferred embodiments of the present application includes alternative implementations in which the functions may be performed out of the order shown or discussed, including performing the functions substantially concurrently or in the reverse order depending upon the functions involved, which should It is understood by those skilled in the art to which the embodiments of the present application belong.

The logic and/or steps represented in flowcharts or otherwise described herein, for example, may be considered an ordered listing of executable instructions for implementing the logical functions, may be embodied in any computer-readable medium, For use with, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from and execute instructions from an instruction execution system, apparatus, or apparatus) or equipment. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with an instruction execution system, apparatus, or apparatus. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections with one or more wiring (electronic devices), portable computer disk cartridges (magnetic devices), random access memory (RAM), Read Only Memory (ROM), Erasable Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program may be printed, as the paper or other medium may be optically scanned, for example, followed by editing, interpretation, or other suitable medium as necessary process to obtain the program electronically and then store it in computer memory.

It should be understood that various parts of this application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented by any one of the following techniques known in the art, or a combination thereof: discrete with logic gates for implementing logic functions on data signals Logic circuits, application specific integrated circuits with suitable combinational logic gates, Programmable Gate Arrays (PGA), Field Programmable Gate Arrays (FPGA), etc.

Those skilled in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be stored in a computer-readable storage medium. When executed, one or a combination of the steps of the method embodiment is included.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing module, or each unit may exist physically alone, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, and the like. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (15)

1. A short circuit detection method of a battery is characterized by comprising the following steps:

acquiring the voltage of the battery, and calculating the voltage variation of the battery in the current preset time period;

and carrying out short circuit detection on the battery according to the voltage variation of the battery.

2. The method according to claim 1, wherein the load voltage variation of the battery is a product of a load current variation of the battery and a direct current internal resistance of the battery.

3. The method according to claim 1 or 2, wherein when the battery is not short-circuited, the voltage variation of the battery is a first voltage variation, wherein a difference between the first voltage variation and a theoretical voltage variation is smaller than a tolerance value, and the theoretical voltage variation is a product of a current variation of the battery and a direct current internal resistance of the battery.

4. The method according to claim 1 or 2, wherein the battery is short-circuited, and the voltage variation of the battery is a second voltage variation, wherein the second voltage variation is a voltage variation when the battery is not short-circuited plus a voltage variation caused by a short circuit.

5. A short circuit detection method of a battery is characterized by comprising the following steps:

acquiring the current of the battery, and calculating the current variation of the battery in the current preset time period;

determining a reference voltage range according to the current variation of the battery;

acquiring the voltage of the battery, and calculating the voltage variation of the battery in the current preset time period;

and when the voltage variation of the battery exceeds the reference voltage range, judging that the battery is short-circuited.

6. The method of detecting a short circuit in a battery according to claim 5, further comprising:

and when the voltage variation of the battery does not exceed the reference voltage range, judging that the battery is not short-circuited.

7. The method of detecting a short circuit of a battery according to claim 5 or 6, wherein the determining a reference voltage range according to the amount of current variation of the battery includes:

calculating theoretical voltage variation according to the current variation of the battery and the direct current internal resistance of the battery;

and judging the range of the acquired reference voltage according to the theoretical voltage variation and the tolerance value.

8. The method of detecting a short circuit in a battery according to claim 7, further comprising:

and calculating the short-circuit current of the battery according to the voltage variation of the battery and the current variation of the battery.

9. The method of detecting a short circuit in a battery according to claim 8, further comprising:

determining that the short-circuit current of the battery is greater than or equal to a preset current value;

and carrying out short-circuit protection.

10. A short circuit detection device for a battery, comprising:

the acquisition module is used for acquiring the voltage of the battery and calculating the voltage variation of the battery in the current preset time period;

and the detection module is used for carrying out short-circuit detection on the battery according to the voltage variation of the battery.

11. A short circuit detection device for a battery, comprising:

the acquisition module is used for acquiring the voltage of the battery, calculating the voltage variation of the battery in the current preset time period, acquiring the current of the battery, and calculating the current variation of the battery in the current preset time period;

and the detection module is used for determining a reference voltage range according to the current variation of the battery and judging that the battery is short-circuited when the voltage variation of the battery is determined to exceed the reference voltage range.

12. A short circuit detection device for a battery, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the short circuit detection method for a battery according to any one of claims 1 to 4.

13. A short circuit detection device for a battery, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the short circuit detection method for a battery according to any one of claims 5 to 9.

14. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, implements a method of short circuit detection of a battery as claimed in any one of claims 1 to 4.

15. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out a method of short circuit detection of a battery according to any one of claims 5 to 9.

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