CN111624508A - Battery short circuit detection method and device - Google Patents
Battery short circuit detection method and device Download PDFInfo
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- CN111624508A CN111624508A CN201910146662.2A CN201910146662A CN111624508A CN 111624508 A CN111624508 A CN 111624508A CN 201910146662 A CN201910146662 A CN 201910146662A CN 111624508 A CN111624508 A CN 111624508A
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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
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method and an apparatus for detecting a short circuit of a battery.
Background
When the battery is in use, if the battery is in a severe condition such as falling, needling and the like, the battery is likely to be in short circuit and other abnormalities, but the related technology has no proper method and means for timely and accurately detecting the battery.
Content of application
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the application provides a method and a device for detecting the short circuit of the battery, which can realize the purpose of quickly and accurately judging the battery short circuit abnormality on the premise of not increasing the cost of a battery management module.
An embodiment of a first aspect of the present application provides 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 the current preset time period, wherein the voltage variation is acquired; and carrying out short circuit detection on the battery according to the voltage variation of the battery.
According to the short circuit detection method of the battery, the voltage variation of the battery is obtained, then the short circuit detection is carried out on the battery according to the voltage variation of the battery, therefore, the short circuit abnormity of the battery can be judged rapidly and accurately on the premise that the cost of a battery management module is not increased, and the safety of the battery is improved.
According to one embodiment of the application, the load current of the battery changes in the direct current internal resistance of the battery to cause the load voltage of the battery to change, wherein the load current of the battery changes in a direction opposite to 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 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 the current variation of the battery and the direct current internal resistance of the battery.
According to an embodiment of the application, the battery is short-circuited, and the voltage variation of the battery is a second voltage variation, wherein the second voltage variation is obtained by superimposing a voltage variation when the battery is not short-circuited on a voltage variation caused by a short circuit.
The embodiment of the second aspect of the present application provides a method for detecting a short circuit of a battery, including 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 variation 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; determining that the voltage variation of the battery exceeds the reference voltage variation range; and judging that the battery is short-circuited.
According to the short circuit detection method of the battery, the current variation of the battery is obtained, the reference voltage variation range is determined according to the current variation of the battery, then the voltage variation of the battery is obtained, and short circuit detection is carried out on the battery according to the voltage variation of the battery and the reference voltage variation range, so that the short circuit abnormality of the battery can be judged quickly and accurately on the premise of not increasing the cost of a battery management module, and the safety of the battery is improved.
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 of the reference voltage variation range includes: acquiring the current variation of the battery; and calculating the variation range of the acquired reference voltage according to the current variation of the battery, the direct current internal resistance of the battery and the tolerance value.
According to an embodiment of the present application, the method for detecting a short circuit of a battery further includes: and calculating the internal short current of the battery according to the voltage variation of the battery and the current variation of the battery.
The third aspect of the present application provides a short circuit detection device for a battery, including: 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.
According to the short circuit detection device of battery that this application embodiment provided, the voltage variation of battery is acquireed to the acquisition module, then, detection module carries out the short circuit detection to the battery according to the voltage variation of battery to, realize under the prerequisite that does not increase battery management module cost, can judge battery short circuit unusually fast accurately, promote the security of battery.
The embodiment of the fourth aspect of the present application provides a short circuit detection device for a battery, including: 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 change range according to the current change of the battery and judging that the battery is short-circuited when the voltage change of the battery is determined to exceed the reference voltage change range.
According to the short-circuit detection device of the battery, the acquisition module acquires the voltage variation of the battery and the current variation of the battery, the detection module determines the reference voltage variation range according to the current variation of the battery and performs short-circuit detection on the battery according to the voltage variation of the battery and the reference voltage variation range, and therefore on the premise that the cost of the battery management module is not increased, the short-circuit abnormality of the battery can be judged quickly and accurately, and the safety of the battery is improved.
A short circuit detection device for a battery provided in an embodiment of a fifth aspect of the present application includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the short circuit detection method for a battery according to the foregoing first aspect of the present invention.
According to the short circuit detection device for the battery, disclosed by the embodiment of the invention, the short circuit abnormity of the battery can be rapidly and accurately judged on the premise of not increasing the cost of the battery management module, and the safety of the battery is improved.
A short circuit detection device for a battery according to an embodiment of a sixth aspect of the present application includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the short circuit detection method for a battery according to the embodiment of the second aspect.
According to the short circuit detection device for the battery, disclosed by the embodiment of the invention, the short circuit abnormity of the battery can be rapidly and accurately judged on the premise of not increasing the cost of the battery management module, and the safety of the battery is improved.
A sixth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the short circuit detection method for a battery according to the foregoing first aspect of the present invention.
A sixth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the short circuit detection method for a battery of the foregoing second aspect of the embodiment.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a method for detecting a short circuit of a battery according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an equivalent circuit model of a battery according to one embodiment of the present application;
FIG. 3 is a schematic diagram of load voltage variations caused by load current according to one embodiment of the present application;
FIG. 4 is a graph illustrating a variation of a load current versus a load voltage according to an embodiment of the present application;
FIG. 5 is a schematic diagram of DC internal resistance versus temperature according to one embodiment of the present application;
fig. 6 is a schematic flow chart illustrating a method for detecting a short circuit of a battery according to another embodiment of the present application;
FIG. 7 is a schematic diagram of a variation curve of a load voltage of a battery under a needle-punching condition according to another embodiment of the present application;
FIG. 8 is a schematic diagram of a load voltage profile of a battery under a sag condition according to another embodiment of the present application;
FIG. 9 is a block schematic diagram of a short circuit detection device of a battery according to one embodiment of the present application;
fig. 10 is a block schematic diagram of a short circuit detection device of a battery according to yet another embodiment of the present application;
fig. 11 is a block diagram illustrating a short circuit detection apparatus of a battery according to still another embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
A short circuit detection method and apparatus of a battery according to an embodiment of the present application will be described below with reference to the accompanying drawings.
According to fig. 1-4, a method for detecting a short circuit of a battery is provided in an embodiment of a first aspect of the present application. As shown in fig. 1, the method for detecting a short circuit of a battery according to an embodiment of the present application includes the steps of:
s101: and acquiring the voltage of the battery, and calculating the voltage variation of the battery in the current preset time period.
Wherein, the load voltage of the battery changes due to the load current of the battery changing from the direct current internal resistance of the battery.
In some embodiments of the present application, an equivalent circuit model of the battery may be as shown in fig. 2, where Uoc is UL + Ro × IL + Up, Uoc is an open circuit voltage, Ro is a direct current internal resistance, Rp is a polarization resistance, Cp is a polarization capacitance, Up is a polarization voltage, IL is a load current, and UL is a load voltage. The load current IL is a current supplied to the load from the battery detected by the current detection unit, and the load current of the battery may be detected by sampling a current detection resistor and a current detection meter, for example. The load voltage UL is a voltage applied to the load by the battery detected by the voltage detection unit, and may be sampled by, for example, series voltage division.
It should be understood that, as shown in fig. 3, when the load current of the battery changes abruptly, for example, IL changes from IL1 to IL2, the load voltage of the battery changes, for example, UL changes from UL1 to UL2, and according to the model Uoc of fig. 2, UL + Ro × IL + Up, it can be seen that instantaneous Uoc and Up do not change abruptly. Further, the model Uoc of fig. 2 satisfies the following relationship:
Uoc＝UL1+Ro×IL1+Up＝UL2+Ro×IL2+Up；
transformation of UL1+ Ro × IL1+ Up ═ UL2+ Ro × IL2+ Up yields:
(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 a corresponding voltage change, and the change relationship is: Δ U is Ro × Δ I, and Δ U is a voltage change amount and Δ I is a current change amount.
It should be understood that in the embodiment of the present application, the current of the battery changes in a direction opposite to the voltage of the battery, wherein the current may include a battery increase and a battery decrease, and the voltage may include a voltage increase and a voltage decrease. That is, the direction of change in the current of the battery opposite to the direction of change in the voltage of the battery may mean that the voltage changes in the direction in which the voltage decreases when the current changes in the direction in which the current increases, and the voltage changes in the direction in which the voltage increases when the current changes in the direction in which the current decreases.
According to the examples of fig. 4-5, the voltage change caused by the current change acting on the direct current internal resistance of the battery is verified, the battery is discharged in a 1A/2A interval 1S switching manner in the normal temperature environment, the voltage and current values are collected, and the voltage and current change curves are shown in fig. 4; at this point, the battery impedance look-up table is 53m Ω as shown in fig. 5. It is true that the theoretical voltage change amount Δ U — Ro × Δ I is calculated as Δ U — Ro × Δ I — 53 × 1 — 53mV, the actually detected voltage change amount is 50mV, and the actually detected voltage change amount is within the tolerance value range of the theoretical voltage change amount (53 ± 5mV) assuming that the tolerance value is ± 5mV, thereby indicating that the corresponding voltage change can be caused by the direct-current internal resistance of the battery to which the current change acts.
It should be noted that, if the temperature of the battery does not suddenly change, the direct-current internal resistance Ro from full charging to emptying of the battery does not suddenly change. Specifically, the direct-current internal resistance Ro of the battery can be experimentally modeled and updated through real-time learning, and can be obtained in advance.
Specifically, in this embodiment, the voltage of the battery may refer to a battery load voltage, and calculating the voltage variation of the battery in the current preset time period may include: acquiring battery load voltage U (te) at the ending moment of the current preset time period, and acquiring battery load voltage U (ts) at the starting moment of the current preset time period; calculating the difference between the battery load voltage U (te) at the ending time and the battery load voltage U (ts) at the starting time to obtain the voltage change of the battery, namely delta U' ═ U (te) -U (ts).
It should be noted that the time length t of the preset time period can be set according to actual situations. Assuming that the current time is t1, the current preset time period is a time period from time (t1-t) to time t1, where time (t1-t) is a starting time of the current preset time period, time t1 is an ending time of the current preset time period, at this time, a voltage change amount of the battery between time t1 and time (t1-t) is calculated, so that a voltage change amount of the battery within the current preset time period can be obtained, where the voltage change amount of the battery between time t1 and time (t1-t) is U (t1) -U (t1-t), U (t1) is a battery load voltage at time t1, and U (t1-t) is a battery load voltage at time (t 1-t).
S102: and carrying out short circuit detection on the battery according to the voltage variation of the battery.
That is, in the embodiment of the present application, whether the battery is short-circuited or not may be determined according to the voltage variation of the battery.
It should be understood that the voltage of the battery is changed due to the fact that the current change of the battery acts on the direct current internal resistance of the battery, and therefore, whether the battery is short-circuited can be judged by analyzing the voltage change quantity of the battery.
Specifically, the battery is not short-circuited, and 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. For example, when the short circuit of the battery does not occur, the voltage variation of the battery varies within a tolerance value range of the product of the current variation of the battery and the direct current internal resistance of the battery, where the tolerance value is ± u (u may take the aforementioned 5mV), that is, the range of the first voltage variation is (Ro × Δ I ± u).
And the voltage variation of the battery is a second voltage variation, wherein the second voltage variation is obtained by superposing the voltage variation when the battery is not short-circuited with the voltage variation caused by the short circuit. For example, when a short circuit occurs in the battery, the voltage variation of the battery is obtained by superimposing the voltage variation when the short circuit does not occur on the voltage variation when the short circuit does not occur, wherein the voltage variation when the short circuit does not occur is within the range of (Ro × Δ I ± u).
That is, when the battery is normal, that is, when no short circuit occurs, the voltage change amount is within the tolerance value range of the theoretical voltage change amount, where the theoretical voltage change amount Δ U is Ro × Δ I. When the battery is in a short circuit from a normal state, instantaneous short current is generated, voltage variation delta U1 generated by the instantaneous short current is superposed on normal voltage variation delta U, and when the short circuit occurs, the superposed actual voltage variation of delta U + delta U1 exceeds the tolerance value range (delta U +/-U) of the voltage variation.
Therefore, the voltage variation delta U' of the battery is detected in real time and is compared with the tolerance range (delta U +/-U) of the theoretical voltage variation. If the real-time voltage variation delta U' is within the range of (delta U +/-U), the battery is normal; if the real-time voltage variation Δ U' is outside the range of (Δ U ± U), the battery is short-circuited.
It is to be understood that "the voltage change amount Δ U 'is in the range of (Δ U ± U)" includes Δ U' being equal to or greater than the smaller of Δ U + U and Δ U-U and being equal to or less than the larger of Δ U + U and Δ U-U; "the voltage change amount Δ U ' is out of the range of (Δ U ± U)" includes that Δ U ' is larger than the larger value of Δ U + U and Δ U-U or that Δ U ' is smaller than the smaller value of Δ U + U and Δ U-U.
It should be noted that the short circuit detection method for the battery provided by the embodiment of the application is applicable to devices with batteries, such as electronic devices (e.g., mobile phones, tablet computers, wearable devices, and the like), vehicles, and the short circuit detection method can be applied to short circuit detection under various working conditions, such as short circuit detection under a shutdown working condition of the mobile phone, short circuit detection under a startup working condition of the mobile phone, short circuit detection under an application program (APP) use working condition, short circuit detection under a screen-off working condition of the mobile phone, and the like, and can accurately and timely detect short circuit abnormality of the battery under each working.
In summary, according to the short circuit detection method for the battery provided by the embodiment of the application, the voltage variation of the battery is acquired, and then the short circuit detection is performed on the battery according to the voltage variation of the battery, so that the short circuit abnormality of the battery can be rapidly and accurately judged on the premise of not increasing the cost of the battery management module, and the safety of the battery is improved.
According to fig. 6-8, a second embodiment of the present application provides a method for detecting a short circuit of a battery.
As shown in fig. 6, the method for detecting a short circuit of a battery according to the embodiment of the present application includes the following steps:
s201: and acquiring the current of the battery, and calculating the current variation of the battery in the current preset time period.
Specifically, in this embodiment, the current of the battery may refer to a battery load current, and calculating the current variation of the battery in the current preset time period may include: acquiring a battery load current I (te) at the ending moment of the current preset time period, and acquiring a battery load current I (ts) at the starting moment of the current preset time period; the difference between the battery load current I (te) at the end time and the battery load current I (ts) at the start time is calculated to obtain the current variation of the battery, i.e., Δ I' ═ I (te) -I (ts).
It should be noted that the time length t of the preset time period can be set according to actual situations. Assuming that the current time is t1, the current preset time period is a time period from a time (t1-t) to a time t1, where the time (t1-t) is a starting time of the current preset time period, the time t1 is an ending time of the current preset time period, at this time, a current variation of the battery between a time t1 and a time (t1-t) is calculated, so that a current variation of the battery within the current preset time period can be obtained, where the current variation of the battery between the time t1 and the time (t1-t) is I (t1) -U (t1-t), I (t1) is a battery load current at the time t1, and I (t1-t) is a battery load current at the time (t 1-t).
The battery load current can be detected through a sampling resistor.
S202: and determining a reference voltage variation range according to the current variation of the battery.
Specifically, determining the reference voltage variation 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 determining and acquiring a reference voltage variation range according to the theoretical voltage variation and the tolerance value.
It should be understood that the theoretical voltage change amount refers to a voltage change amount calculated by a theoretical formula such as Δ U ═ Ro × Δ I mentioned below. The tolerance value refers to a magnitude that allows fluctuation of the theoretical voltage variation, for example, ± u. The reference voltage variation range is a 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 or not.
Specifically, the equivalent circuit model of the battery may be as shown in fig. 2, where Uoc is UL + Ro × IL + Up, Uoc is an open circuit voltage, Ro is a direct current internal resistance, Rp is a polarization resistance, Cp is a polarization capacitance, Up is a polarization voltage, IL is a load current, and UL is a load voltage. The load current IL is a current supplied to the load from the battery detected by the current detection unit, and the load current of the battery may be detected by sampling a current detection resistor and a current detection meter, for example. The load voltage UL is a voltage applied to the load by the battery detected by the voltage detection unit, and may be sampled by, for example, series voltage division.
It should be understood that, as shown in fig. 3, when the load current of the battery changes abruptly, for example, IL changes from IL1 to IL2, the load voltage of the battery changes, for example, UL changes from UL1 to UL2, and according to the model Uoc of fig. 2, UL + Ro × IL + Up, it can be seen that instantaneous Uoc and Up do not change abruptly. Further, the model Uoc of fig. 2 satisfies the following relationship:
Uoc＝UL1+Ro×IL1+Up＝UL2+Ro×IL2+Up；
transformation of UL1+ Ro × IL1+ Up ═ UL2+ Ro × IL2+ Up yields:
(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 a corresponding voltage change, and the change relationship is: Δ U is Ro × Δ I, and Δ U is a voltage change amount and Δ I is a current change amount.
Thus, the theoretical voltage variation amount Δ U is Ro × Δ I, the tolerance value is ± U (U may take 5mV), and the reference voltage variation range is a tolerance value range (Ro × Δ I ± U) in which the product of the current variation amount of the battery and the direct current internal resistance of the battery is obtained.
In the embodiment of the present application, the current of the battery changes in the opposite direction to the voltage of the battery. That is, when the current increases, the voltage decreases, and when the current decreases, the voltage increases.
It should be noted that, if the temperature of the battery does not suddenly change, the direct-current internal resistance Ro from full charging to emptying of the battery does not suddenly change. Specifically, the direct-current internal resistance Ro of the battery can be experimentally modeled and updated through real-time learning, and can be obtained in advance.
S203: and acquiring the voltage of the battery, and calculating the voltage variation of the battery in the current preset time period.
Specifically, in this embodiment, the voltage of the battery may refer to a battery load voltage, and calculating the voltage variation of the battery in the current preset time period may include: acquiring battery load voltage U (te) at the ending moment of the current preset time period, and acquiring battery load voltage U (ts) at the starting moment of the current preset time period; calculating the difference between the battery load voltage U (te) at the ending time and the battery load voltage U (ts) at the starting time to obtain the voltage change of the battery, namely delta U' ═ U (te) -U (ts).
It should be noted that the time length t of the preset time period can be set according to actual situations. Assuming that the current time is t1, the current preset time period is a time period from time (t1-t) to time t1, where time (t1-t) is a starting time of the current preset time period, time t1 is an ending time of the current preset time period, at this time, a voltage change amount of the battery between time t1 and time (t1-t) is calculated, so that a voltage change amount of the battery within the current preset time period can be obtained, where the voltage change amount of the battery between time t1 and time (t1-t) is U (t1) -U (t1-t), U (t1) is a battery load voltage at time t1, and U (t1-t) is a battery load voltage at time (t 1-t).
The battery load voltage can be detected through a voltage dividing resistor.
S204: it is determined that the voltage variation of the battery exceeds the reference voltage variation range.
S205: and judging that the battery is short-circuited.
That is, in the embodiment of the present application, whether the battery is short-circuited or not may be determined according to the voltage variation amount of the battery and the reference voltage variation range.
It should be understood that when the load current changes, for example, from IL1 to IL2, the amount of current change Δ I' may be detected in real time, according to the change relationship: when the voltage change Δ U caused by the load current change is detected in real time, for example, when the load voltage UL1 changes to UL2, the tolerance value, which is the system integrated error, is assumed to be U, and the voltage change Δ U' actually detected in a normal case should be within the (Δ U ± U) interval. Therefore, whether the battery is short-circuited or not can be judged by comparing the actual voltage variation of the battery with the reference voltage variation range.
Specifically, according to an embodiment of the present application, the method for detecting a short circuit of a battery further includes: and determining that the voltage variation of the battery cell does not exceed the reference voltage variation range, and judging that the battery cell is not short-circuited.
It should be understood that the voltage of the battery is changed due to the fact that the current change of the battery acts on the direct current internal resistance of the battery, and therefore, whether the battery is short-circuited can be judged by analyzing the voltage change quantity of the battery. Specifically, when the short circuit of the battery does not occur, the voltage variation of the battery varies within a tolerance range of a product of the current variation of the battery and the direct current internal resistance of the battery, where the tolerance range is ± u (u may take the aforementioned 5mV), and the tolerance range of a product of the current variation of the battery and the direct current internal resistance of the battery is (Ro × Δ I ± u). When the short circuit of the battery occurs, the voltage variation of the battery includes the voltage variation when the short circuit of the battery does not occur and the voltage variation caused by the short circuit, wherein the voltage variation when the short circuit of the battery does not occur is in the range of (Ro multiplied by delta I +/-u).
That is, when the battery is normal, that is, when no short circuit occurs, the voltage change amount is within the tolerance value range of the theoretical voltage change amount, where the theoretical voltage change amount Δ U is Ro × Δ I. While, as shown in fig. 7 and 8, the battery is momentarily short-circuited by the needle stick and the dropping of the battery, the load voltage of the battery is momentarily dropped. Wherein, the battery short circuit, battery diaphragm rupture lead to the battery positive negative pole short circuit in the twinkling of an eye to produce the electric current, cause battery voltage to drop in the twinkling of an eye. Therefore, when the battery is short-circuited from normal, the voltage variation Δ U1 due to instantaneous short current is superimposed on the normal voltage variation Δ U, and when the short circuit occurs, the actual voltage variation superimposed by Δ U + Δ U1 is out of the tolerance range of the voltage variation (Δ U ± U).
Based on this, in the embodiment of the application, the voltage variation Δ U' of the battery is detected in real time and compared with the tolerance range (Δ U ± U) of the theoretical voltage variation. If the real-time voltage variation delta U' is within the range of (delta U +/-U), the battery is normal; if the real-time voltage variation Δ U' is outside the range of (Δ U ± U), the battery is short-circuited.
It is to be understood that "the voltage change amount Δ U 'is in the range of (Δ U ± U)" includes Δ U' being equal to or greater than the smaller of Δ U + U and Δ U-U and being equal to or less than the larger of Δ U + U and Δ U-U; "the voltage change amount Δ U ' is out of the range of (Δ U ± U)" includes that Δ U ' is larger than the larger value of Δ U + U and Δ U-U or that Δ U ' is smaller than the smaller value of Δ U + U and Δ U-U.
Therefore, 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.
Further, according to an embodiment of the present application, the method for detecting a short circuit of a battery further includes: and calculating the internal short 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
wherein Is the internal short instantaneous current of the battery, Δ U' Is the detected voltage variation, Δ I Is the detected current variation, and Ro Is the dc impedance value.
Further, in some embodiments of the present application, after the internal short transient current Is of the battery Is calculated, the internal short transient current Is of the battery may be displayed, for example, a specific value of the internal short transient current Is displayed, so that a user can visually know the short circuit condition of the battery.
In other embodiments of the present application, after the internal short transient current Is of the battery Is calculated, a corresponding internal short protection strategy may be further determined according to the internal short transient current Is of the battery, different control strategies are adopted in different internal short transient current intervals, and then short-circuit protection Is performed according to the corresponding internal short protection strategy, for example, when the internal short transient current Is smaller than a preset current value, short-circuit protection Is not performed, and when the internal short transient current Is greater than or equal to the preset current value, short-circuit protection Is performed, for example, an output loop of the battery Is disconnected, so that the battery stops supplying power to a load. Therefore, when the short circuit condition is not serious, the battery can continue to discharge, the normal operation of the equipment is maintained, and the user experience is improved.
It should be noted that the short circuit detection method for the battery provided by the embodiment of the application is applicable to devices with batteries, such as electronic devices (e.g., mobile phones, tablet computers, wearable devices, and the like), vehicles, and the short circuit detection method can be applied to short circuit detection under various working conditions, such as short circuit detection under a shutdown working condition of the mobile phone, short circuit detection under a startup working condition of the mobile phone, short circuit detection under an application program (APP) use working condition, short circuit detection under a screen-off working condition of the mobile phone, and the like, and can accurately and timely detect short circuit abnormality of the battery under each working.
In summary, according to the short circuit detection method for the battery provided by the embodiment of the application, the current variation of the battery is obtained, the reference voltage variation range is determined according to the current variation of the battery, then the voltage variation of the battery is obtained, and the short circuit detection is performed on the battery according to the voltage variation of the battery and the reference voltage variation range, so that the short circuit abnormality of the battery can be rapidly and accurately judged on the premise of not increasing the cost of the battery management module, and the safety of the battery is improved.
In order to implement the embodiment of the first aspect, the present application further provides a short circuit detection device for a battery.
Fig. 9 is a block diagram illustrating a short circuit detection apparatus for a battery according to an embodiment of the present application. As shown in fig. 9, the short circuit detection device of the battery includes an acquisition module 101 and a detection module 102.
The obtaining module 101 is configured to obtain a voltage of the battery, and calculate a voltage variation of the battery in a current preset time period; the detection module 102 is configured to perform short circuit detection on the battery according to a voltage variation of the battery.
According to an embodiment of the present application, a change in the load current of the battery, which is caused by a change in the dc internal resistance of the battery, causes a change in the load voltage of the battery, and the change in the load current of the battery is opposite to the change in 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 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.
According to one embodiment of the application, the battery is short-circuited, and the voltage variation of the battery is a second voltage variation, wherein the second voltage variation is obtained by superimposing the voltage variation when the battery is not short-circuited on the voltage variation caused by the short-circuit.
It should be noted that the foregoing explanation of the embodiment of the short circuit detection method for a battery is also applicable to the short circuit detection device for a battery of this embodiment, and details are not repeated here.
To sum up, according to the short circuit detection device of battery that this application embodiment provided, the voltage variation that the module acquireed the battery, then, detection module carries out the short circuit detection to the battery according to the voltage variation of battery to, realize under the prerequisite that does not increase battery management module cost, can accurately judge the battery short circuit unusually fast, promote the security of battery.
In order to implement the foregoing first aspect embodiment, the present application further provides another short circuit detection apparatus for a battery, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where when the processor executes the computer program, the short circuit detection apparatus for a battery implements the foregoing first aspect embodiment.
In order to implement the foregoing first aspect embodiment, the present application also proposes a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the short circuit detection method of the battery of the foregoing first aspect embodiment.
In order to implement the foregoing second aspect embodiment, the present application also proposes another short circuit detection device for a battery.
Fig. 10 is a block diagram schematically illustrating a short detection apparatus for a battery according to still another embodiment of the present application. As shown in fig. 10, the short circuit detection apparatus of the battery includes an acquisition module 201 and a detection module 202.
The obtaining module 201 is configured to obtain a voltage of a battery, calculate a voltage variation of the battery in a current preset time period, obtain a current of the battery, and calculate a current variation of the battery in the current preset time period; the detection module 202 is configured to determine a reference voltage variation range according to a current variation of the battery, and determine that the battery is short-circuited when it is determined that the voltage variation of the battery 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 detecting module 202 is further configured to calculate a theoretical voltage variation according to the current variation of the battery and the dc internal resistance of the battery, and determine to obtain a reference voltage variation range according to the theoretical voltage variation and the tolerance.
According to an embodiment of the present application, as shown in fig. 11, the short circuit detection apparatus further includes a calculating module 203, and the calculating module 203 is configured to calculate the internal short 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 apparatus further includes a protection module, and the protection module performs short circuit protection when it is determined that the internal short current of the battery is greater than or equal to a preset current value.
It should be noted that the foregoing explanation of the embodiment of the short circuit detection method for a battery is also applicable to the short circuit detection device for a battery of this embodiment, and details are not repeated here.
In summary, according to the short-circuit detection device for a battery provided by the embodiment of the invention, the obtaining module obtains the voltage variation of the battery and obtains the current variation of the battery, the detecting module determines the reference voltage variation range according to the current variation of the battery, and performs short-circuit detection on the battery according to the voltage variation of the battery and the reference voltage variation range, so that the short-circuit abnormality of the battery can be quickly and accurately determined on the premise of not increasing the cost of the battery management module, and the safety of the battery is improved.
In order to implement the foregoing second aspect embodiment, the present application further provides another short circuit detection apparatus for a battery, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where when the processor executes the computer program, the short circuit detection apparatus for a battery as in the second aspect embodiment is implemented.
In order to implement the foregoing second aspect embodiment, the present application also proposes a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the short circuit detection method of the battery of the foregoing second aspect embodiment.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
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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| CN201910146662.2A CN111624508A (en) | 2019-02-27 | 2019-02-27 | Battery short circuit detection method and device |
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| CN201910146662.2A CN111624508A (en) | 2019-02-27 | 2019-02-27 | Battery short circuit detection method and device |
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