CN217954678U - Battery internal resistance detection system and battery internal resistance detector - Google Patents
Battery internal resistance detection system and battery internal resistance detector Download PDFInfo
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- CN217954678U CN217954678U CN202221186300.XU CN202221186300U CN217954678U CN 217954678 U CN217954678 U CN 217954678U CN 202221186300 U CN202221186300 U CN 202221186300U CN 217954678 U CN217954678 U CN 217954678U
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Abstract
The utility model discloses an internal resistance of battery detecting system and internal resistance of battery detector, through insert internal resistance of battery computational element and add the intermediate variable in the return circuit that awaits measuring, super capacitor promptly, when the battery in the return circuit that awaits measuring through internal resistance of battery computational element is in direct current operating condition, draw super capacitor's in the return circuit that awaits measuring charging voltage and discharge voltage, make internal resistance of battery computational element pass through super capacitor's charging voltage and discharge voltage calculation and obtain the internal resistance of battery, because charging voltage and discharge voltage at this moment draw under the return circuit that awaits measuring is in operating condition, the internal resistance of battery in the return circuit that awaits measuring under the real-time supervision operating condition has been realized, and the charging voltage and the discharge voltage that draw super capacitor detect the polarization internal resistance that exists when can avoiding detecting the voltage at battery both ends to the influence of the internal resistance of battery that records, the accuracy of internal resistance of battery has been promoted promptly, still provide convenience for the real-time supervision of internal resistance of battery.
Description
Technical Field
The utility model relates to a battery internal resistance measures technical field, in particular to battery internal resistance detecting system and battery internal resistance detector.
Background
The battery internal resistance is generally divided into alternating current internal resistance and direct current internal resistance, when the battery internal resistance is obtained by measuring the direct current internal resistance, the polarization internal resistance generated by electrode capacity polarization causes deviation of the measured direct current internal resistance, so the accurate battery internal resistance cannot be measured, therefore, on the basis of the problem, the battery internal resistance is obtained by measuring the alternating current internal resistance, the influence of the polarization internal resistance can be avoided due to the alternating current internal resistance, but the battery works in a direct current state, so the battery internal resistance obtained by measuring the alternating current internal resistance can avoid the influence of the polarization internal resistance, but the obtained battery internal resistance still has deviation, and the battery internal resistance under the working state of the battery is not beneficial to monitoring the battery internal resistance in real time.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a battery internal resistance detecting system and battery internal resistance detector, aim at solving current battery internal resistance measurement scheme because of polarization internal resistance and battery operating condition's restriction, lead to measuring the technical problem that there is the deviation in the gained battery internal resistance.
In order to achieve the above object, the present invention provides a battery internal resistance detection system, which includes a loop to be detected and a battery internal resistance calculation unit;
the loop to be tested is connected with the battery internal resistance calculating unit;
and the battery internal resistance calculating unit is used for calculating the battery internal resistance of the loop to be detected according to the charge-discharge voltage detected in the loop to be detected.
Optionally, the loop to be tested comprises a battery power supply, a battery internal resistance, a first switching element and a super capacitor;
the positive electrode of the battery power supply is connected with one end of the battery internal resistance, the other end of the battery internal resistance is connected to one end of the first switch element, the other end of the first switch element is connected with one end of the super capacitor, and the other end of the super capacitor is connected to the negative electrode of the battery power supply.
Optionally, when the loop to be tested is in a charging state, the first switching element is in a closed state, and the battery power supply charges the super capacitor through the internal resistance of the battery.
Optionally, the loop to be tested further includes a second switching element and a precision resistor;
one end of the super capacitor is connected with one end of the second switch element, the other end of the second switch element is connected with the precision resistor, and the other end of the precision resistor is connected with the other end of the super capacitor.
Optionally, when the loop to be tested is in a discharging state, the second switching element is in a closed state, and the super capacitor discharges through the precision resistor.
Optionally, the battery internal resistance calculation unit includes a voltage detection module;
and the voltage detection module is connected to two ends of the super capacitor and used for detecting the charging voltage and the discharging voltage of the super capacitor.
Optionally, the battery internal resistance calculation unit further comprises a processor;
the processor is connected with the voltage detection module.
Optionally, the battery internal resistance calculation unit further includes a clock module;
the clock module is connected with the processor and used for providing charging and discharging time of charging and discharging voltage for the processor.
Optionally, the super capacitor is grounded.
The embodiment also provides a battery internal resistance detector, which comprises the battery internal resistance detection system, wherein the battery internal resistance detection system comprises a loop to be detected and a battery internal resistance calculation unit;
the loop to be tested is connected with the battery internal resistance calculating unit;
and the battery internal resistance calculating unit is used for calculating the battery internal resistance of the loop to be detected according to the charge-discharge voltage detected in the loop to be detected.
The utility model discloses technical scheme is through inserting battery internal resistance computational element in the return circuit that awaits measuring, through battery internal resistance computational element when the return circuit that awaits measuring is in operating condition, charge voltage and discharge voltage in the return circuit that awaits measuring draw, make battery internal resistance computational element obtain the battery internal resistance through charge voltage and discharge voltage calculation, because charge voltage and discharge voltage this moment draw under the return circuit that awaits measuring is in operating condition, the battery internal resistance of return circuit that awaits measuring under the real-time supervision operating condition has been realized, and draw charge voltage and discharge voltage and detect the polarization internal resistance that exists when can avoiding detecting the voltage at battery both ends to the influence of the battery internal resistance that records, the accuracy of battery internal resistance has been promoted promptly, still provide convenience for the real-time supervision of battery internal resistance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic connection diagram of the main components of the battery internal resistance detection system of the present invention;
FIG. 2 is a schematic diagram of the connection of components inside the loop to be tested according to the present invention;
fig. 3 is the utility model discloses the curve sketch of the charging current and the discharging current that record when voltage detection module carries out the simulation experiment to the return circuit that awaits measuring.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name(s) | |
| 10 | Loop to be tested | SW1- | Switching element | |
| 20 | Battery internal resistance calculating unit | C | Super capacitor | |
| E | Battery power supply | R2 | Precision resistor | |
| R1 | Internal resistance of battery |
The realization, the functional characteristics and the feasible points of the utility model are further explained by referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front, and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a battery internal resistance detecting system.
In an embodiment of the present invention, as shown in fig. 1, the battery internal resistance detection system includes a loop to be detected 10 and a battery internal resistance calculation unit 20;
the loop 10 to be tested is connected with the battery internal resistance calculation unit 20;
the circuit to be tested 10 is divided into a charging circuit to be tested 10 and a discharging circuit to be tested 10 according to the state of the built-in switching element.
The battery internal resistance calculation unit 20 is configured to detect a charging voltage of the charging to-be-detected circuit 10 and a discharging voltage of the discharging to-be-detected circuit 10, and calculate a battery internal resistance R1 of the to-be-detected circuit 10 according to the detected charging voltage and discharging voltage, because the battery internal resistance R1 is calculated when the to-be-detected circuit 10 is in a charging and discharging state at this time, the accuracy of the battery internal resistance is higher, but the battery internal resistance is different from the existing battery internal resistance measured through the direct current internal resistance, in the existing method for measuring the battery internal resistance based on the direct current internal resistance, an instant load current is generated by a battery pack, then an instant change of the voltage on a battery post is measured, the battery internal resistance R1 is obtained according to the calculation, when the battery pack generates the instant load current, the polarization internal resistance is also generated accordingly, and the accuracy of the calculated battery internal resistance is lower due to the generated polarization internal resistance.
And the utility model discloses in order to avoid polarizing the influence of internal resistance to the direct current internal resistance that records (being battery internal resistance R1), change into and measure the charge-discharge voltage of the super capacitor C that inserts in the return circuit 10 that awaits measuring under different charge-discharge state to through calculating different time quantum, the difference under the same capacitor voltage obtains battery internal resistance R1, has promoted the accuracy of surveying the battery internal resistance promptly, still provides convenience for the real-time supervision of battery internal resistance.
Specifically, as shown in fig. 2, the circuit to be tested 10 includes a battery power supply E, a battery internal resistance R1, a first switch element SW1, and a super capacitor C;
the positive electrode of the battery power supply E is connected with one end of the battery internal resistance R1, the other end of the battery internal resistance R1 is connected to one end of the first switch element SW1, the other end of the first switch element SW1 is connected with one end of the super capacitor C, and the other end of the super capacitor C is connected to the negative electrode of the battery power supply E.
As can be seen from fig. 2, in an embodiment, when the circuit to be measured 10 is in a charging state, the first switching element SW1 is in a closed state at this time, and the second switching element SW2 is in an off state, so that the battery power source E, the battery internal resistance R1 and the super capacitor C form a charging loop, and the battery power source E charges the super capacitor C through the battery internal resistance R1, so that a relationship between a voltage at two ends of the super capacitor C and a charging time at this time is a formula (1):
in formula (1), U C Representing the voltage across the supercapacitor C, E being the voltage of the battery supply E, t Charging device For the charging time, rC represents the internal resistance of the supercapacitor C in the charging state, exp represents an exponential function with e as the base, so
rC for e is-t Charging device To the power, according to the formula (1), the battery internal resistance calculation unit 20 can obtain the charging voltage of the super capacitor C at different charging time points according to the change of the charging time.
Further, the circuit to be tested 10 further includes a second switch element SW2 and a precision resistor R2;
one end of the super capacitor C is connected with one end of the second switch element SW2, the other end of the second switch element SW2 is connected with the precision resistor R2, and the other end of the precision resistor R2 is connected with the other end of the super capacitor C.
As can be seen from fig. 2, in an embodiment, when the circuit to be measured 10 is in a discharging state, the second switching element SW2 is in a closed state at this time, and the first switching element SW1 is in a cut-off state, so that the super capacitor C and the precision resistor R2 form a discharging circuit, the super capacitor C discharges through the precision resistor R2, and a relationship between a voltage at two ends of the super capacitor C and a discharging time at this time is obtained as a formula (2):
in the formula (2), t Put Represents the discharge time, RC represents the internal resistance of the supercapacitor C in the discharge state, and therefore
An RC score of-t for e Put To the power, the battery internal resistance calculation unit 20 may calculate the change of the battery internal resistance according to the discharge time by the formula (2)And obtaining the discharge voltage of the super capacitor C at different discharge time points.
Specifically, as shown in fig. 3, the battery internal resistance calculation unit 20 includes a voltage detection module;
and the voltage detection module is connected to two ends of the super capacitor C and used for detecting the charging voltage and the discharging voltage of the super capacitor C.
Further, the battery internal resistance calculation unit 20 further includes a processor;
and the processor is connected with the voltage detection module and is used for receiving the charging voltage and the discharging voltage uploaded by the voltage detection module.
Further, the battery internal resistance calculation unit 20 further includes a clock module;
the clock module is connected with the processor and used for providing charging and discharging time of charging and discharging voltage for the processor.
In this embodiment, a curve of the charging voltage and the discharging voltage of the super capacitor C shown in fig. 3 can be obtained by performing a simulation test on the circuit to be tested 10 through the voltage detection module, where a curve represents the current value of the super capacitor C in the charging state, and b curve represents the current value of the super capacitor C in the discharging state, as can be known from the graph, when the circuit to be tested 10 enters the charging state, the voltage inside the super capacitor C can be rapidly increased until infinitely approaching 4V, when the circuit to be tested 10 enters the discharging state, the voltage inside the super capacitor C can be gradually decreased until infinitely approaching 0V, and the specific charging and discharging voltage and the charging and discharging time are based on the actual measurement result.
After the voltage detection module measures the charging voltage and the discharging voltage in each charging time and each discharging time, the charging voltage and the discharging voltage are transmitted to the processor, so that the processor calculates the internal resistance R1 of the battery in the loop 10 to be measured based on the charging voltage and the discharging voltage.
Taking the graph shown in fig. 3 as an example, it can be seen from the graph that when the charging time is t1 and the discharging time is t2, the charging voltage and the discharging voltage are both at the same time
Where, i.e., the charging voltage = the discharging voltage =2V, U will be at this time C Substituting into formula (1) and formula (2) can result in formula (3):
since the voltage E of the battery power source E, the charging time t1, the discharging time t2 and the resistance value of the precision resistor R2 are known numbers, the formula (4) obtained by converting the formula (3) is
Wherein, t1= Ln2 × R × C, t2= Ln2 × R × C, the known resistance value of the precision resistor R2, the charging time t1, and the discharging time t2 are directly substituted into the formula (4), so as to obtain the resistance value of the battery internal resistance R1, thereby realizing the measurement of the battery internal resistance when the battery is in the direct current working state, avoiding the influence of the polarization internal resistance on the measured battery internal resistance, and greatly improving the accuracy of the battery internal resistance and the convenience of the measurement process.
It should be noted that the super capacitor C is an intermediate variable, and the larger the capacitance value of the super capacitor C is, the smaller the test error of the charging time t1 and the discharging time t2 is, so that the accuracy of the measured internal resistance of the battery can be improved by increasing the capacitance value of the super capacitor C and lengthening the charging and discharging time.
Further, the super capacitor C is grounded and plays a role in filtering.
The utility model also provides a battery internal resistance detector, the battery internal resistance detection system comprises a loop to be detected 10 and a battery internal resistance calculation unit 20;
the loop to be tested 10 is connected with the battery internal resistance calculation unit 20;
the battery internal resistance calculating unit 20 is configured to calculate the battery internal resistance of the to-be-measured loop 10 according to the charge-discharge voltage detected in the to-be-measured loop 10.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. The system for detecting the internal resistance of the battery is characterized by comprising a loop to be detected and a battery internal resistance calculating unit;
the loop to be tested is connected with the battery internal resistance calculating unit;
and the battery internal resistance calculating unit is used for calculating the battery internal resistance of the loop to be detected according to the charge-discharge voltage detected in the loop to be detected.
2. The battery internal resistance detection system according to claim 1, wherein the circuit to be tested includes a battery power supply, a battery internal resistance, a first switching element and a super capacitor;
the positive electrode of the battery power supply is connected with one end of the battery internal resistance, the other end of the battery internal resistance is connected to one end of the first switch element, the other end of the first switch element is connected with one end of the super capacitor, and the other end of the super capacitor is connected to the negative electrode of the battery power supply.
3. The system for detecting the internal resistance of the battery according to claim 2, wherein when the loop to be detected is in a charging state, the first switching element is in a closed state, and the battery power supply charges the super capacitor through the internal resistance of the battery.
4. The system for detecting the internal resistance of the battery according to claim 2, wherein the circuit to be tested further comprises a second switching element and a precision resistor;
one end of the super capacitor is connected with one end of the second switch element, the other end of the second switch element is connected with the precision resistor, and the other end of the precision resistor is connected with the other end of the super capacitor.
5. The system for detecting the internal resistance of the battery according to claim 4, wherein when the circuit to be detected is in a discharging state, the second switching element is in a closed state, and the super capacitor is discharged through the precision resistor.
6. The battery internal resistance detection system according to claim 2, wherein the battery internal resistance calculation unit includes a voltage detection module;
and the voltage detection module is connected to two ends of the super capacitor and used for detecting the charging voltage and the discharging voltage of the super capacitor.
7. The battery internal resistance detection system according to claim 6, wherein the battery internal resistance calculation unit further includes a processor;
the processor is connected with the voltage detection module.
8. The battery internal resistance detection system according to claim 7, wherein the battery internal resistance calculation unit further includes a clock module;
the clock module is connected with the processor and used for providing charging and discharging time of charging and discharging voltage for the processor.
9. The battery internal resistance detection system according to claim 2, wherein the super capacitor is grounded.
10. A battery internal resistance detector, characterized in that it comprises the battery internal resistance detection system according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221186300.XU CN217954678U (en) | 2022-05-17 | 2022-05-17 | Battery internal resistance detection system and battery internal resistance detector |
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| CN202221186300.XU CN217954678U (en) | 2022-05-17 | 2022-05-17 | Battery internal resistance detection system and battery internal resistance detector |
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