CN118226284A - Resistance correction method, current detection method, battery and electronic equipment - Google Patents

Abstract

The application discloses a resistance correction method, a current detection method, a battery and electronic equipment, wherein the resistance correction method comprises the following steps: when the battery is charged and discharged with a preset current, the voltage drop of the structural component of the battery is collected, the resistance correction parameter of the structural component is determined according to the voltage drop of the structural component of the battery, and the resistance correction is carried out on the structural component based on the resistance correction parameter. By adopting the resistance correction method, the resistance of the battery structural member can be corrected according to the actual voltage drop of the battery structural member, so that the accuracy of the resistance of the battery structural member is improved.

Description

Resistance correction method, current detection method, battery and electronic equipment

Technical Field

The application relates to the technical field of mobile terminals, in particular to a resistance correction method, a current detection method, a battery and electronic equipment.

Background

Currently, with the development of wireless communication technology, a power supply mode of a mobile terminal (for example, a mobile phone or a personal computer) is changed from a wired power supply to a battery power supply. The battery generally comprises a battery core and a circuit board, and the battery core is electrically connected with the circuit board through a battery core tab to realize charge and discharge of the battery.

In the prior art, the resistance of the battery cell tab may deviate, thereby affecting the use of the battery, for example, causing the current detection accuracy of the battery to deviate. Therefore, correction of the resistance of the battery cell tab is a problem to be solved.

Disclosure of Invention

In view of the foregoing drawbacks or shortcomings in the prior art, it is desirable to provide a resistance correction method, a current detection method, a battery, and an electronic device, which are capable of correcting a resistance value of a battery structural member according to an actual voltage drop of the battery structural member, so as to improve accuracy of the resistance value of the battery structural member.

In a first aspect, the present invention provides a resistance correction method, the method comprising:

when the battery is charged and discharged with a preset current, the voltage drop of the structural component of the battery is collected, the resistance correction parameter of the structural component is determined according to the voltage drop of the structural component of the battery, and the resistance correction is carried out on the structural component based on the resistance correction parameter.

In a second aspect, the present invention provides a current detection method, the method comprising:

when the battery is charged and discharged with a preset current, collecting the pressure drop of a structural member of the battery, determining a resistance correction parameter of the structural member according to the pressure drop of the structural member of the battery, and carrying out resistance correction on the structural member based on the resistance correction parameter;

And acquiring the current pressure drop of the structural member, and determining the current of the battery according to the current pressure drop of the structural member and the resistance value of the structural member after the resistance value correction.

In a third aspect, the present invention provides a battery comprising a cell and a current detection assembly; the current sensing assembly is configured to perform the steps performed by the current sensing assembly in the method of any of the second aspects to sense current of the battery through the structural members of the battery.

In a fourth aspect, the present invention provides an electronic device comprising a processor, a power supply and a battery as claimed in any one of the third aspects.

Compared with the prior art that battery structural members (battery cell lugs) with deviation resistance values are directly utilized to detect battery current, the resistance correction method, the current detection method, the battery and the electronic equipment provided by the embodiment of the application can correct the resistance values of the battery structural members according to the actual voltage drop of the battery structural members, so that the accuracy of the resistance values of the battery structural members is improved, and the error degree of the current detection precision of the battery is reduced.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present application;

FIG. 2 is a schematic flow chart of a resistance correction method according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a current detection method according to an embodiment of the present application;

fig. 4 is a schematic diagram showing an exploded structure of a battery 13 according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a battery cell 132 according to the prior art according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a battery cell tab according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a position of a voltage sampling point according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating another position of a voltage sampling point according to an embodiment of the present application;

FIG. 9 is a schematic diagram illustrating another position of a voltage sampling point according to an embodiment of the present application;

FIG. 10 is a schematic diagram illustrating another position of a voltage sampling point according to an embodiment of the present application;

FIG. 11 is a schematic diagram illustrating another position of a voltage sampling point according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a circuit board 131 of a battery 13 according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a battery 13 after a circuit board 131 is encapsulated according to an embodiment of the present application;

FIG. 14 is an enlarged view of a portion of the tab and the circuit board of FIG. 13 according to an embodiment of the present application;

Fig. 15 is a schematic structural diagram of an electronic device 10 according to an embodiment of the present application.

Detailed Description

The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting thereof. It should be further noted that, for convenience of description, only the portions related to the present application are shown in the drawings.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In the prior art, a mobile terminal (e.g., a mobile phone or a personal computer) includes a chip, a power supply 12, and a battery 13. Fig. 1 is a schematic structural diagram of a battery in the prior art according to an embodiment of the present application, referring to fig. 1, a battery 13 includes a battery core 132, a battery core adhesive tape 19, a circuit board 131, and a current detection resistor 18, where the battery core 132 includes a first tab 1321 and a second tab 1322. In the process of packaging the battery 13, the battery core adhesive tapes 19 are arranged on the two sides and the tail of the battery core 132, the circuit board 131 is arranged on the head of the battery core 132, and the current detection resistor 18 is arranged on the circuit board 131.

When the current of the battery 13 is detected by using the current detecting resistor 18, the power supply 12 of the mobile terminal is connected in series with the circuit board 131 of the battery 13 and the current detecting resistor 18 on the circuit board 131, and the chip of the mobile terminal detects the voltage drop across the current detecting resistor 18 and obtains the current flowing through the current detecting resistor 18 based on ohm's law (i.e. the ratio of the voltage drop across the current detecting resistor 18 to the resistance value of the current detecting resistor 18). The current detection resistor 18 and the circuit board 131 of the battery 13 are in a series state, so that the current flowing through the current detection resistor 18 is also the current flowing through the circuit board 131 of the battery 13, that is, the current flowing through the battery 13.

However, since the current detection resistor 18 is connected in series to the circuit board 131, as shown in the heat calculation formula q=i ² Rt, in the same time, there is an additional heat generation amount of the current detection resistor 18, which leads to a linear increase of the resistivity of the current detection resistor 18 with temperature; secondly, since the resistance value of the current detection resistor 18 is small, when the current value flowing through the current detection resistor is small, the detection voltage at two ends of the current detection resistor 18 is very weak, and the accuracy of the current value flowing through the current detection resistor 18 calculated according to ohm's law is low, that is, the current value of the battery 13 is inaccurate. In addition, the current detection resistor 18 is connected in series to the PCB circuit of the battery 13, so that the size of the PCB is increased, and the cost of current detection is increased.

Based on the above, the embodiment of the application provides a resistance correction method, a current detection method, a battery and electronic equipment, which can correct the resistance of a battery structural member according to the actual voltage drop of the battery structural member, thereby improving the accuracy of the resistance of the battery structural member and detecting the current of the battery with higher precision.

Fig. 2 is a flow chart of a resistance correction method according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

Step 201, collecting voltage drop of a structural member of the battery when the battery is charged and discharged with a preset current;

In one possible implementation manner, the battery may be charged or discharged according to a preset current, and when the battery is charged or discharged, a current flows through a structural member of the battery, the current acts on the resistance of the structural member, and a voltage drop is generated at two ends of the structural member. If the resistance of the structural member deviates, a certain measurement error exists when the current flowing through the battery is calculated based on the voltage drop and the resistance of the structural member, namely the accuracy of the battery current detection is affected.

The structural member of the battery can be a component at any position of the battery, for example, can be a battery core tab of the battery or other connecting pieces between the battery core tab and a battery electric circuit board.

For example, the battery may be charged and discharged according to a preset current by the control circuit. For example, in the charging process of the battery, the battery can be connected to a charging circuit, and a charging controller in the charging circuit is utilized to control a power supply to output proper current according to the requirement of preset current; in the discharging process of the battery, the battery can be connected to a discharging circuit, and the discharging controller in the discharging circuit is used for controlling the output current of the battery according to the requirement of the preset current.

In one possible implementation, the voltage of the structure may be collected by a sampling point. The sampling points may be two sampling points with a certain distance on the structural member, and may specifically be a protruding structure on the surface of the structural member. For example, the voltage values between sampling points on the structural member of the battery can be read by the chip. For example, the voltage value between the sampling points may be the voltage drop between two voltage sampling points of the cell tab.

Step 202, determining a resistance correction parameter of the structural member according to the pressure drop of the structural member of the battery, and performing resistance correction on the structural member based on the resistance correction parameter.

In the embodiment of the application, the resistance correction parameter is used for correcting the resistance of the structural member. The parameter may be the actual resistance of the structure or other information that is used to suggest how to modify the structure. Therefore, the resistance value correction of the structural member in the embodiment of the application can be a correction of a software layer, for example, the actual resistance value of the structural member is calculated and recorded by a chip, and the actual resistance value of the structural member is used for calculating related parameters. Or the technician refers to the prompt information to correct the shape or the size of the structural member, so that the actual resistance of the structural member is close to or equal to the calibrated resistance of the structural member, the chip still records the calibrated resistance of the structural member, and the calculation of the related parameters is carried out by adopting the calibrated resistance of the structural member.

Compared with the prior art that battery current is detected by directly utilizing the battery cell lugs with the deviation resistance, the resistance correction method provided by the embodiment of the application can correct the resistance of the battery structural member according to the actual voltage drop of the battery structural member, thereby improving the accuracy of the resistance of the battery structural member and reducing the error degree of the current detection precision of the battery.

In another embodiment of the present application, a specific way of modifying the resistance of the structure is also provided. For example, the foregoing "determining the resistance correction parameter of the structural member according to the pressure drop of the structural member of the battery, and performing the resistance correction on the structural member based on the resistance correction parameter" includes: determining the actual resistance of the structural member according to the voltage drop and the preset current; and updating the calibrated resistance of the structural member to the actual resistance of the structural member.

In the embodiment of the application, the calibration resistance of the battery structural member is updated to the actual resistance of the battery structural member, so that the accuracy of the resistance of the battery structural member is improved, and the accuracy of the subsequent current detection result is further ensured.

In one possible implementation manner, when the battery is charged and discharged with a preset current, the actual resistance value of the battery structural member can be determined according to the actual voltage drop value and the preset current value of the battery structural member. For example, the ratio of the actual voltage drop value of the battery structure to the preset current value may be determined as the actual resistance value of the battery structure.

For example, the ratio between the voltage drop value between two voltage sampling points of the battery cell tab and the current value flowing through the battery cell tab may be determined as the actual resistance value of the battery cell tab.

In one possible implementation, the nominal resistance of the battery structure may be updated to the actual resistance of the battery structure. The calibration resistance is attribute information of the battery structural member. When the battery structural member is a battery cell tab, the actual resistance value of the battery cell tab can be recorded by the processing chip to update the calibrated resistance value of the battery cell tab.

For example, when the theoretical value of the resistance value of the battery cell tab is 1mΩ, the actual value of the resistance value of the battery cell tab is 0.9mΩ, when there is a 1A current flowing through the battery cell tab, the processing chip can obtain that the voltage drop between two voltage sampling points of the same battery cell tab is 0.9mV, based on ohm's law, the current value i=0.9 mV/1mΩ=0.9A can be calculated, the current value is smaller than the actual current value, and the calculation result is inaccurate.

At this time, calibration can be performed, when the 1A standard current is passed, the voltage drop of the current sensor can be measured to be 0.9mV, and based on ohm's law, r=0.9 mV/1a=0.9 mΩ, the information of the 1A standard current and the voltage drop of the current sensor can be input into the processing chip, and the processing chip confirms that the existing resistance value is 0.9mΩ. The voltage drop can be calculated as 9mV by applying a 10A current, and based on ohm's law, the true current is 9mV/0.9mΩ=10a, when the detected current value is the same as the actual value.

Correcting the original voltage drop by 0.9mV according to the voltage drop corresponding to the resistance difference of 0.1mΩ by 0.1mV, and inputting the corrected voltage value of 1mV into the processing chip. When the processing chip calculates the current value flowing through the two ends of the battery cell tab, the correction voltage value 1mV and the theoretical battery cell tab resistance value 1mΩ can be substituted into the ohm law formula to obtain the current flowing through the battery cell tab as 1A (equal to the current value actually flowing through the battery cell tab), and the calculated current value flowing through the battery cell tab is accurate.

In another embodiment of the application, a specific way of determining the actual resistance of the structure is also provided. Illustratively, the foregoing "determining the actual resistance of the structural member according to the voltage drop and the preset current" includes: determining the basic resistivity of the structural member according to the voltage drop and the preset current; and acquiring the temperature of the structural member, determining the actual resistivity of the structural member according to the temperature and the basic resistivity, and determining the actual resistance of the structural member according to the actual resistivity.

In the embodiment of the application, the actual resistance of the battery structural member is determined by combining the actual temperature of the battery structural member, so that the error of the heat generated by the battery structural member on the resistance of the battery structural member is avoided, and the accuracy of the resistance of the battery structural member is further improved.

In one possible implementation manner, the first resistance of the battery structural member may be determined according to the actual voltage drop of the battery structural member and the preset current, and the basic resistivity of the battery structural member may be determined according to the first resistance. The first resistance may be an actual resistance of the battery structural member that is not updated as referred to above; the base resistivity refers to the resistance value of a substance per unit length, unit area, or unit volume under specific conditions.

The resistivity is a characteristic property of a conductor, and is related to the conductivity of a conductor material. For example, according to ohm's law, the resistance value R is related to the conductor resistivity ρ, the conductor length L, and the conductor cross-sectional area a, which may be expressed specifically as r=ρ×l/a.

For example, the first resistance of the battery structure, the length of the battery structure, and the cross-sectional area of the battery structure may be substituted into r=ρ_l/a described above to obtain the base resistivity. Wherein the base resistivity may be denoted as ρ0.

In one possible implementation, the actual resistivity of the battery structure may be determined based on the real-time temperature of the battery structure and the base resistivity ρ0, and the actual resistance of the battery structure may be determined based on the actual resistivity. Wherein, the actual resistivity refers to the resistivity of a substance under certain conditions.

By way of example, the actual resistivity may be calculated by the following formula:

ρ＝ρ0[1+α(T－T0)]

Wherein ρ is used to represent the actual resistivity, ρ0 is used to represent the base resistivity, α is used to represent the coefficient of resistivity with temperature change, T is used to represent the current actual temperature, and T0 is used to represent the temperature corresponding to the substance at the base resistivity.

For example, taking copper as an example, when the base resistivity ρ0 is 18.51, the actual resistivity ρ of copper can be expressed as: ρ=18.51×1+ (t-20) ×0.0039].

For example, the actual resistance of the battery structure may be determined based on the actual resistivity of the battery structure. For example, the actual resistivity ρ of the battery structure, the length L of the battery structure, and the cross-sectional area a of the battery structure may be substituted into r=ρ_l/a to obtain the actual resistance of the battery structure.

In another embodiment of the application, a specific way of acquiring the temperature of the structure is also provided. Illustratively, the foregoing "collecting the temperature of the structure" includes: and acquiring the temperature of the structural member through a temperature sensor arranged on the structural member.

In one possible implementation, the actual temperature value of the battery structure may be obtained by a temperature sensor.

For example, the temperature sensor may be disposed opposite the battery structure. For example, the temperature sensor may be a thermal resistance sensor (RTD), a thermistor sensor (Thermistor), a thermocouple sensor (Thermocouple), an infrared temperature sensor, a linear temperature sensor (Linear Temperature Sensor), or the like.

In another embodiment of the present application, another specific modification of the structural resistance is also provided. For example, the foregoing "determining the resistance correction parameter of the structural member according to the pressure drop of the structural member of the battery, and performing the resistance correction on the structural member based on the resistance correction parameter" includes: determining the actual resistance of the structural member according to the pressure drop of the structural member, determining the difference between the actual resistance of the structural member and the calibrated resistance of the structural member, and outputting correction indication information according to the difference; the correction indication information is used for providing guidance for correction of the structural member so that the actual resistance value of the structural member reaches the calibrated resistance value; the modification of the structural member includes at least one of a size modification and a shape modification.

In the real-time example of the application, the battery structural member can be restored to the calibrated resistance value by correcting the shape or the size of the battery structural member through the processing chip under the condition that the specific resistance value of the battery structural member is not updated, so that the accuracy of the resistance value of the battery structural member is ensured.

In one possible implementation manner, the correction indication information may be determined according to a difference between the actual resistance value and the calibration resistance value of the battery structural member, so that the actual resistance value of the battery structural member can reach the calibration resistance value according to the correction indication information.

For example, the difference between the actual resistance and the calibration resistance of the battery structural member may be determined first, and then the correction instruction information may be determined according to the difference between the resistances.

It should be noted that the correction indication information of the battery structural member may be determined according to the resistance value difference, because the resistance value of the conductor is positively correlated with the resistance of the conductor, and the resistance of the conductor is correlated with the size or shape of the conductor.

In one possible implementation, the size or shape of the battery structure may be modified according to the modification instruction information.

Illustratively, taking a cell tab as an example, when the size or length of the cell tab changes, the cross-sectional area and length of the conductor also change, resulting in a change in resistance. For example, as the size or shape of the cell tab increases, the cross-sectional area or length of the conductor decreases, resulting in an increase in resistance; conversely, when the size or shape of the cell tab is reduced, the cross-sectional area or length of the conductor is increased, resulting in a decrease in resistance.

Therefore, the actual resistance of the structural member can reach the nominal resistance by changing the size or shape of the structural member of the battery.

In the foregoing embodiments of the application, a way to modify a battery structure prior to calculating a battery current using the battery structure is provided. In another embodiment of the present application, a current detection method is further provided, which can detect a current of a battery based on a battery structural member after the resistance value is corrected, so as to improve accuracy of a current detection result.

Fig. 3 is a schematic flow chart of a current detection method according to an embodiment of the present application. As shown in fig. 3, the method comprises the steps of:

Step 301, collecting the voltage drop of the structural member of the battery when the battery is charged and discharged with a preset current, determining the resistance correction parameter of the structural member according to the voltage drop of the structural member of the battery, and performing resistance correction on the structural member based on the resistance correction parameter.

Step 302, obtaining the current voltage drop of the structural member, and determining the current of the battery according to the current voltage drop of the structural member and the resistance value of the structural member after the resistance value correction.

In one possible implementation, the current of the battery may be determined according to the current voltage drop of the battery structure and the resistance value of the battery structure after the resistance value correction. Wherein the remaining capacity of the battery may be determined according to the present current of the battery.

The resistance value of the battery structural member after the resistance value correction may be an actual resistance value of the battery structural member; the calibration resistance value obtained after the size or the shape of the battery structural member is corrected can also be obtained.

According to the current detection method provided by the embodiment of the application, before the actual detection of the battery current, the resistance correction parameter can be determined according to the actual voltage drop of the battery structural member, and then the resistance correction is performed on the battery structural member based on the resistance correction parameter, for example, the battery structural member is corrected so that the actual resistance of the battery structural member is equal to the calibrated resistance, or the resistance of the battery structural member is corrected to be the actual resistance. Through the resistance correction to the battery structure for the resistance of battery structure is more accurate, carries out the electric current detection to the battery based on the battery structure after the resistance correction further, can effectively improve the detection precision of battery current.

In another embodiment of the application, a specific determination of the battery current is also provided. Illustratively, the foregoing "determining the current of the battery according to the current voltage drop of the structural member and the resistance value after the resistance value correction of the structural member" includes: correcting the resistance value of the structural member comprises correcting the calibrated resistance value of the structural member to be the actual resistance value of the structural member, and determining the current of the battery based on the actual resistance value of the structural member and the current voltage drop of the structural member; or the resistance value of the structural member is modified, including outputting modification indication information, and determining the current of the battery based on the current voltage drop of the modified structural member and the calibrated resistance value of the structural member; the correction indication information is used for providing guidance for correction of the structural member so that the actual resistance value of the structural member reaches the calibrated resistance value; the modification of the structural member includes at least one of a size modification and a shape modification.

In one possible implementation, the result of the ratio of the current voltage drop of the battery structural member to the resistance value of the battery structural member after the resistance value correction may be determined as the current of the battery.

For example, the resistance value of the battery structural member can be corrected by updating the calibrated resistance value of the battery structural member to the actual resistance value of the battery structural member.

Optionally, correction indication information can be determined according to the difference between the actual resistance value and the calibration resistance value of the battery structural member, and the size or shape of the battery structural member can be corrected according to the correction indication information, so that the resistance value correction of the battery structural member is realized.

For example, the current of the battery may be determined as a result of a ratio of the current voltage drop of the battery structure to the resistance of the battery structure after the resistance correction.

In the foregoing embodiments of the present application, a current detection method is provided. In yet another embodiment of the present application, a battery is also provided.

Fig. 4 is an exploded view of a battery 13 according to an embodiment of the present application, and as shown in fig. 4, the battery 13 includes a current detecting component 131 and a battery core 132. The current detecting component 131 is configured to perform the steps performed by the current detecting component 131 in the current detecting method described above, so as to detect the current of the battery 13 through the structural member of the battery 13. Specifically, the battery core 132 includes a first tab 1321 and a second tab 1322.

Fig. 5 is a schematic structural diagram of a battery cell 132 according to an embodiment of the present application, where, as shown in fig. 5, the cell 132 includes two tabs 1321 and 1322 and a sealing step of the cell 132; the two tabs are located at one end of the sealing step of the battery core 132, and extend from the bottom of the sealing step of the battery core 132.

In another embodiment of the present application, the structural member of the battery 13 includes a battery cell tab of the battery 13, specifically, the current detection component 131 may obtain the voltage drop of the battery cell tab through two sampling points on the battery cell tab.

Fig. 6 is a schematic structural diagram of a battery tab according to an embodiment of the present application, as shown in fig. 6, the battery tab may be a first tab 1321 or a second tab 1322 in the battery 13. Wherein, two voltage sampling points 14 are arranged on the battery cell electrode lug.

For example, when the voltage drop between the two voltage sampling points 14 is obtained and the resistance R of the cell tab is known, the current value flowing through the cell tab, that is, the current value flowing through the battery 13, can be obtained according to ohm's law i=u/R.

In another embodiment of the present application, the current detecting component 131 may be integrated on a circuit board of the battery 13, and the battery cell 132 is electrically connected to the circuit board through at least one battery cell tab.

For example, the battery cells 132 may be electrically connected to the circuit board by means of at least one battery tab by soldering or plugging. For example, a soldering tool may be used to solder the battery lugs to pads on the circuit board to make electrical connection of the battery 132 to the circuit board.

In another embodiment of the present application, the distance between two voltage sampling points 14 is L; the width of the battery cell tab is T, and the thickness is W; the distance L, the width T and the thickness W of the battery cell electrode lug are related to the resistance value of the battery cell electrode lug. The distance L is the distance between two sampling points in the parallel direction of the current flow direction, and the width T and the thickness W are the width and the thickness of a section perpendicular to the current flow direction. By way of example, parameters such as distance L, width T, thickness W, etc. will be described with reference to fig. 6 taking the current flow direction as the horizontal direction as an example.

For example, the correlation between the distance L, the width T, and the thickness W of the battery cell tab and the resistance of the battery cell tab may be expressed as the following formula:

R＝(ρ·L)/(T·W)

wherein ρ can be used to represent the resistivity of the cell tabs.

For example, taking the first tab 1321 or the second tab 1322 as an example, when the battery cell tab leaves the factory, knowing the resistance R, the width T and the thickness W of the battery cell tab, the processing chip can obtain the distance L between the two voltage sampling points 14 according to the resistance calculation formula r=ρl/TW.

It should be noted that, since the battery cell tab is essentially a conductor with a certain length, when determining the length L of the battery cell tab, the processing chip may select two points with the length L as the voltage sampling points 14 on the battery cell tab.

And secondly, a material with small resistance change along with temperature can be selected as a material of the battery cell tab, so that the accuracy of battery current detection by adopting the battery cell tab is greatly improved. Illustratively, constantan, manganese copper, nichrome, and the like are possible.

In another embodiment of the present application, fig. 7 is a schematic diagram illustrating a position of a voltage sampling point 14 according to an embodiment of the present application. As shown in fig. 7, two voltage sampling points may be located on the diagonal of the cell tab. When the current direction is the horizontal direction, the voltage drop between the two voltage sampling points 14 is determined according to the actual distance between the sampling points in the current flow direction (i.e., the distance between the two voltage sampling points 14 in the horizontal direction), that is, the distance L affecting the resistance of the cell tab is the distance between the two voltage sampling points 14 in the horizontal direction.

Illustratively, taking the first tab 1321 as an example, two points on a diagonal of the first tab 1321 may be taken as the voltage sampling points 14. For example, the voltage sampling point 14 may be two points on the main/auxiliary diagonal of the first tab 1321.

Or fig. 8 is another schematic diagram of a position of a voltage sampling point 14 according to an embodiment of the present application. As shown in fig. 8, the two voltage sampling points 14 may also be located on the same edge of the same cell tab. When the current direction is the vertical direction, the voltage drop between the two voltage sampling points 14 is determined according to the actual distance between the sampling points in the current flow direction (i.e., the distance between the two voltage sampling points 14 in the vertical direction), that is, the distance L affecting the resistance of the battery cell tab is the distance between the two voltage sampling points 14 in the vertical direction.

Illustratively, taking the first tab 1321 as an example, two points on either side of the first tab 1321 in the vertical direction may be taken as the voltage sampling points 14.

Alternatively, two voltage sampling points 14 may also be selected on one side edge of the second tab 1322.

Or fig. 9 is another schematic diagram of a position of a voltage sampling point 14 according to an embodiment of the present application. As shown in fig. 9, two voltage sampling points 14 may be located in the direction of the center line of the same cell tab.

Illustratively, taking the first tab 1321 as an example, two points in the center line direction of the first tab 1321 may be taken as the voltage sampling points 14.

For example, fig. 10 is a schematic diagram illustrating another position of a voltage sampling point 14 according to an embodiment of the present application. As shown in fig. 10, when the current direction is horizontal, the two voltage sampling points 14 may be located in the horizontal center line direction of the same cell tab.

Optionally, fig. 11 is another schematic diagram of a position of one voltage sampling point 14 according to an embodiment of the present application, as shown in fig. 11, when the current direction is the vertical direction, the two voltage sampling points 14 may be located in the vertical center line direction of the same cell tab.

In another embodiment of the present application, the accuracy of current detection can also be achieved by adjusting the distance between the voltage sampling points. For example, the distance between the two voltage sampling points may be set to a larger pitch.

It should be noted that, when the distance between two sampling points is larger, the resistance value R is correspondingly larger, and the voltage of the current flowing through the two sampling points at the two ends of R is increased, that is, when the current change is very small, the voltage of the sampling points is obviously changed due to the increase of R, so that the situation that the current value of the battery 13 is inaccurate due to the fact that the current detecting resistor 18 with small volume and small resistance is connected in series due to space limitation in the prior art is avoided, and the accuracy of the current value of the battery 13 is greatly improved.

In another embodiment of the present application, the sampling points 14 may be protruding structures on the surface of the cell tab.

The protruding structure may be two protruding points welded on the surface of the battery cell tab when the battery cell tab leaves the factory.

In another embodiment of the present application, the protruding structure may be formed by protruding a side of the battery tab close to the circuit board to a side far from the circuit board.

Fig. 12 is a schematic structural diagram of a circuit board 131 of a battery 13 according to an embodiment of the present application. In the packaging process of the battery 13, the circuit board 131 may be placed on the surface of the sealing step of the battery core 132 in fig. 12, and the first tab 1321 is connected to the first input terminal 1311, and the second tab 1322 is connected to the second input terminal 1312.

Alternatively, the connection may be performed by welding, conductive adhesive bonding, riveting, or sintering copper paste. Preferably, the connection is made by laser welding. Further, the battery cell tab is bent to a side away from the extending direction of the battery cell tab to form a protruding structure, thereby completing the packaging of the circuit board 131.

In another embodiment of the present application, a concave structure is disposed on the circuit board, and when the battery tab is connected with the concave structure, a side of the battery tab bent toward the circuit board is spaced from the circuit board by the convex structure.

Fig. 13 is a schematic structural diagram of a battery 13 after a circuit board 131 is packaged, referring to fig. 13, two concave structures are disposed on the circuit board 131, and when a first tab 1321 and a second tab 1322 are respectively connected with the two concave structures, a physical space is formed between the first tab 1321 and the second tab 1322 on a side bent toward the circuit board 131 by the convex structures. It is understood that the physical spacing may be a gap between the cell tab and the circuit board 131.

Fig. 14 is a partial enlarged view of the battery tab and the circuit board 131 in fig. 13 according to an embodiment of the present application, see fig. 14. The protruding structure of the first tab 1321 or the second tab 1322 bent toward the circuit board 131 is an integrally formed structure with an opening facing outward and recessed toward the circuit board 131.

It should be noted that, with the convex structure in fig. 14, a physical space (i.e., a gap) exists between the bent tab and the circuit board 131, compared with fig. 13, due to the physical space, a portion of the bent battery core tab overlapping the circuit board 131 can be covered with more copper foil, according to a resistance formula r=ρl/TW, since the copper foil on the circuit board 131 increases, the width of the circuit board 131 increases, the resistance of the circuit board 131 decreases, and the upper limit of the current flowing through the circuit board 131 increases (i.e., the overcurrent capacity of the circuit board 131 increases) according to ohm law i=u/R, thereby ensuring the use safety of the battery 13.

In the foregoing embodiments of the present application, a battery is provided. In yet another embodiment of the present application, an electronic device is also provided. Fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 15, the electronic device 10 includes a processor 11, a power source 12 and a battery 13. The processor 11 may be a processing chip for recording the actual resistance value of the battery structure.

Specifically, the power source 12 is in series connection with the battery 13, and the current detection element 131, the first tab 1321, and the second tab 1322 are in series connection.

The processor 11 is configured to obtain a voltage drop of the first tab 1321 or the second tab 1322 when the power supply 12 drives the battery 13, and determine a current value of the battery 13 according to the voltage drop of the first tab 1321 or the second tab 1322; the processor 11 is also used for carrying out resistance correction on the battery cell tab.

When the battery 13 is used to detect the current, the power supply 12 of the electronic device 10 is connected in series with the current detection module 131 of the battery 13, and thus it can be understood that the current flowing through the battery 13 is the current flowing through the battery tab when the power supply 12 of the electronic device 10 is connected in series with the first tab 1321 and the second tab 1322 in the battery 13.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (16)

1. A method of resistance correction, the method comprising:

and when the battery is charged and discharged with a preset current, collecting the voltage drop of the structural member of the battery, determining the resistance correction parameter of the structural member according to the voltage drop of the structural member of the battery, and carrying out resistance correction on the structural member based on the resistance correction parameter.

2. The method of claim 1, wherein determining a resistance correction parameter for the structural member based on the voltage drop of the structural member of the battery, and performing resistance correction for the structural member based on the resistance correction parameter, comprises:

Determining the actual resistance of the structural member according to the voltage drop and the preset current;

And updating the calibration resistance of the structural member to the actual resistance of the structural member.

3. The method of claim 2, wherein said determining an actual resistance of the structure from the voltage drop and the preset current comprises:

Determining a base resistivity of the structural member according to the voltage drop and the preset current;

and acquiring the temperature of the structural member, determining the actual resistivity of the structural member according to the temperature and the basic resistivity, and determining the actual resistance of the structural member according to the actual resistivity.

4. A method according to claim 3, wherein said acquiring the temperature of the structure comprises:

and acquiring the temperature of the structural member through a temperature sensor arranged on the structural member.

5. The method of claim 1, wherein determining a resistance correction parameter for the structural member based on the voltage drop of the structural member of the battery, and performing resistance correction for the structural member based on the resistance correction parameter, comprises:

determining the actual resistance of the structural member according to the pressure drop of the structural member, determining the difference between the actual resistance of the structural member and the calibrated resistance of the structural member, and outputting correction indication information according to the difference; the correction indication information is used for providing guidance for correction of the structural member so that the actual resistance value of the structural member reaches the calibrated resistance value; the modification of the structural member includes at least one of a size modification and a shape modification.

6. A current sensing method for use in a current sensing assembly, the method comprising:

When a battery is charged and discharged with preset current, collecting the voltage drop of a structural member of the battery, determining a resistance correction parameter of the structural member according to the voltage drop of the structural member of the battery, and carrying out resistance correction on the structural member based on the resistance correction parameter;

And acquiring the current voltage drop of the structural member, and determining the current of the battery according to the current voltage drop of the structural member and the resistance value of the structural member after the resistance value correction.

7. The method of claim 6, wherein determining the current of the battery based on the current voltage drop of the structure and the resistance of the structure after the resistance correction comprises:

Correcting the resistance value of the structural member comprises correcting the calibrated resistance value of the structural member to be the actual resistance value of the structural member, and determining the current of the battery based on the actual resistance value of the structural member and the current voltage drop of the structural member; or alternatively

The resistance value correction of the structural member comprises outputting correction indication information, and determining the current of the battery based on the corrected current voltage drop of the structural member and the calibrated resistance value of the structural member; the correction indication information is used for providing guidance for correction of the structural member so that the actual resistance value of the structural member reaches the calibrated resistance value; the modification of the structural member includes at least one of a size modification and a shape modification.

8. The battery is characterized by comprising a current detection component and a battery cell;

the current sensing assembly is configured to perform the steps performed by the current sensing assembly in the method of claim 6 or 7 to sense current of the battery through the structural member of the battery.

9. The battery of claim 8, the structural member of the battery comprising a cell tab of the battery, the current detection assembly capturing a voltage drop across the cell tab through two sampling points on the cell tab.

10. The battery of claim 8, wherein the current detection assembly is integrated on a circuit board of the battery, the cells being electrically connected to the circuit board by at least one cell tab.

11. The battery of claim 9, wherein the distance between the two sampling points is L; the width of the battery cell tab is T, and the thickness of the battery cell tab is W; the distance L, the width T and the thickness W are related to the resistance of the battery cell tab.

12. The battery of any one of claims 9-11, wherein the two sampling points are located on a diagonal of the same cell tab; or alternatively

The two sampling points are positioned on the same edge of the same battery cell tab; or alternatively

The two sampling points are positioned in the direction of the center line of the same battery cell tab.

13. The battery of any of claims 9-11, wherein the sampling points are raised structures on the cell tab surface.

14. The battery of claim 13, wherein the protruding structure is formed by a protrusion of a side of the cell tab adjacent to the circuit board toward a side remote from the circuit board.

15. The battery according to any one of claims 9 to 11, wherein a concave structure is provided on the circuit board, and when the battery cell tab is connected to the concave structure, a face of the battery cell tab bent toward the circuit board is spaced from the circuit board by the convex structure.

16. An electronic device comprising a processor, a power source, and a battery as claimed in any one of claims 8-15.