CN219512375U - Partial pressure acquisition circuit and battery pack detection equipment - Google Patents
Partial pressure acquisition circuit and battery pack detection equipment Download PDFInfo
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- CN219512375U CN219512375U CN202320208703.8U CN202320208703U CN219512375U CN 219512375 U CN219512375 U CN 219512375U CN 202320208703 U CN202320208703 U CN 202320208703U CN 219512375 U CN219512375 U CN 219512375U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a voltage division acquisition circuit and battery pack detection equipment. The partial pressure acquisition circuit comprises an input port, a first partial pressure module, a second partial pressure module, a third partial pressure module and at least two first detection ends; the input port is used for inputting a signal to be detected; the first voltage dividing module and the second voltage dividing module are connected in series between the input port and the grounding end, and the third voltage dividing module is connected in series between the first voltage dividing module and the second voltage dividing module; the third voltage dividing module is connected with the first voltage dividing module and the second voltage dividing module respectively and is connected with the first detection end; the first detection ends are used for detecting the voltage value of a third voltage division module positioned between two adjacent first detection ends; the voltage value of the third voltage division module is used for combining the impedance relation between the third voltage division module and the first and second voltage division modules to determine the voltage value of the signal to be detected. The voltage value of the signal to be detected is determined by detecting the voltage value of the voltage division module, so that multiple measurement is avoided, and measurement errors are reduced.
Description
Technical Field
The utility model relates to the technical field of battery pack detection, in particular to a voltage division acquisition circuit and battery pack detection equipment.
Background
In the development stage of the battery pack, in order to ensure the quality of the battery pack, the total voltage of the battery pack needs to be measured.
At present, a method of measuring the total voltage of the battery pack generally selects a resistor voltage division method, namely the total voltage of the battery pack is divided into a plurality of small voltages, and the total voltage is obtained by respectively measuring the values of the small voltages and adding the values, but a plurality of random errors occur in the measuring process. To reduce the measurement error, a high-precision metal film resistor is used as the voltage dividing resistor, and a feedback detection device is added, but the accuracy of the voltage measurement is improved, but the cost is increased.
The existing voltage measurement method of the battery pack has the problems of larger error or higher cost, and becomes a technical problem to be solved in the industry.
Disclosure of Invention
The utility model provides a voltage division acquisition circuit and battery pack detection equipment, which are used for solving the problems of random error and higher cost generated by a voltage measurement method of a battery pack in the prior art.
According to an aspect of the present utility model, there is provided a voltage dividing acquisition circuit including:
the device comprises an input port, a first voltage division module, a second voltage division module, a third voltage division module and at least two first detection ends;
the input port is used for inputting a signal to be detected;
the first voltage dividing module and the second voltage dividing module are connected in series between the input port and the ground terminal, and the third voltage dividing module is connected in series between the first voltage dividing module and the second voltage dividing module; the third voltage division module is connected with the first voltage division module and the second voltage division module respectively and is connected with the first detection end;
the first detection ends are used for detecting the voltage value of the third voltage division module between two adjacent first detection ends; the voltage value of the third voltage division module is used for determining the voltage value of the signal to be detected by combining the impedance relation of the third voltage division module, the first voltage division module and the second voltage division module.
Optionally, the third voltage dividing module includes a first parallel branch, a second parallel branch and a reference end; the first parallel branch and the second parallel branch are connected in series between the first detection ends; the reference end is positioned at the connection point of the first parallel branch and the second parallel branch and is used for marking the voltage value of the signal to be detected.
Optionally, the first parallel branch comprises at least two first resistors, and the first resistors are connected in parallel; the second parallel branch comprises at least two second resistors, which are connected in parallel.
Optionally, the first voltage dividing module includes a first end, a second end and at least one third resistor, the first end is connected to the input port, the second end is connected to the first detection end, and the third resistor is connected in series between the first end and the second end.
Optionally, the voltage division acquisition circuit further includes: when the first voltage dividing module comprises at least two third resistors, a second detection end is arranged between two adjacent third resistors, and the second detection end is used for detecting the voltage value of the third resistor positioned between the second detection end and the first detection end in combination with the first detection end; or the second detection end is used for detecting the voltage value of the third resistor between two adjacent second detection ends.
Optionally, the second voltage dividing module includes a first end, a second end and at least one fourth resistor, the first end is connected to the first detection end, the second end is connected to the ground end, and the fourth resistor is connected in series between the first end and the second end.
Optionally, the voltage division acquisition circuit further includes: when the second voltage dividing module comprises at least two fourth resistors, a third detection end is arranged between two adjacent fourth resistors, and the third detection end is used for detecting the voltage value of the fourth resistor positioned between the third detection end and the first detection end in combination with the first detection end; or the third detection end is used for detecting the voltage value of the fourth resistor between two adjacent third detection ends.
Optionally, the voltage division acquisition circuit further includes: a first circuit protection module and a second circuit protection module; the first circuit protection module is connected between the first detection end and the grounding end and is used for filtering out high-frequency voltage components; the second circuit protection module is connected between the first detection end and the grounding end and is used for filtering out high-frequency voltage components.
Optionally, the first circuit protection module includes a fifth resistor and a first capacitor, a first end of the fifth resistor is connected to the first detection end, a second end of the fifth resistor is connected to the first end of the first capacitor, and a second end of the first capacitor is grounded; the second circuit protection module comprises a sixth resistor and a second capacitor, wherein a first end of the sixth resistor is connected with the first detection end, a second end of the sixth resistor module is connected with a first end of the second capacitor, and a second end of the second capacitor is grounded.
According to another aspect of the present utility model, there is provided a battery pack detection apparatus including a detection device and the voltage division acquisition circuit.
The technical scheme of the embodiment of the utility model provides a voltage division acquisition circuit which comprises an input port, a first voltage division module, a second voltage division module, a third voltage division module and at least two first detection ends; the input port is used for inputting a signal to be detected; the first voltage dividing module and the second voltage dividing module are connected in series between the input port and the grounding end, and the third voltage dividing module is connected in series between the first voltage dividing module and the second voltage dividing module; the third voltage dividing module is connected with the first voltage dividing module and the second voltage dividing module respectively and is connected with the first detection end; the first detection ends are used for detecting the voltage value of the third voltage division module between two adjacent first detection ends; the voltage value of the third voltage division module is used for determining the voltage value of the signal to be detected in an impedance relation with the third voltage division module, the first voltage division module and the second voltage division module. The voltage value of the signal to be detected is determined by detecting the voltage values of the voltage dividing modules and the impedance relation among the voltage dividing modules, so that multiple measurement is avoided, random errors generated during multiple measurement are reduced, the measurement accuracy is improved, meanwhile, the voltage dividing modules in the voltage dividing acquisition circuit adopt pure resistor circuits, the circuit structure is simple, and the problem that the measurement method in the prior art is high in cost is solved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a voltage division acquisition circuit according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a third voltage dividing module according to an embodiment of the present utility model;
FIG. 3 is a circuit diagram of a third voltage dividing module according to an embodiment of the present utility model;
FIG. 4 is a circuit diagram of a first voltage dividing module according to an embodiment of the present utility model;
FIG. 5 is a circuit diagram of a second voltage dividing module according to an embodiment of the present utility model;
fig. 6 is a schematic structural diagram of a circuit protection module according to an embodiment of the present utility model;
FIG. 7 is a circuit diagram of a circuit protection module provided by an embodiment of the present utility model;
FIG. 8 is a circuit diagram of a voltage division acquisition circuit according to an embodiment of the present utility model;
fig. 9 is a schematic structural diagram of a battery pack detection apparatus according to an embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a voltage division collecting circuit according to an embodiment of the present utility model, and as shown in fig. 1, a voltage division collecting circuit 100 includes an input port a1, a first voltage division module 110, a second voltage division module 120, a third voltage division module 130, and at least two first detection ends TP1; the input port a1 is used for inputting a signal to be detected; the first voltage dividing module 110 and the second voltage dividing module 120 are connected in series between the input port a1 and the ground terminal, and the third voltage dividing module 130 is connected in series between the first voltage dividing module 110 and the second voltage dividing module 120; the third voltage dividing module 130 is connected to the first detecting end TP1 with the first voltage dividing module 110 and the second voltage dividing module 120 respectively; the first detection end TP1 is configured to detect a voltage value of the third voltage division module 130 located between two adjacent first detection ends TP1; the voltage value of the third voltage division module 130 is used to determine the voltage value of the signal to be detected by combining the impedance relationship between the third voltage division module 130 and the first and second voltage division modules 110 and 120.
In this embodiment, the voltage division collecting circuit is a circuit that collects voltage and performs voltage division processing on the collected voltage, and the voltage division collecting circuit is connected with a device to be detected through an input port a1, for example, the device to be detected is a battery pack or the like. The first voltage dividing module 110, the second voltage dividing module 120 and the third voltage dividing module 130 each include a voltage dividing resistor, and the first voltage dividing module 110, the second voltage dividing module 120 and the third voltage dividing module 130 are connected in series and divide the voltage output by the device to be detected. The first detecting end TP1 may be connected to a detecting device, where the detecting device detects the voltage value of the third voltage dividing module 130 between two adjacent first detecting ends TP1 by connecting two adjacent first detecting ends TP1, for example, the detecting device may be a multimeter or the like. The voltage value of the third voltage division module 130 is used for determining the voltage value of the signal to be detected with the impedance relation between the third voltage division module 130 and the first voltage division module 110 and the second voltage division module 120, wherein the impedance relation between the third voltage division module 130 and the first voltage division module 110 and the second voltage division module 120 can be determined according to the preset impedance values of the first voltage division module 110, the second voltage division module 120 and the third voltage division module 130 respectively. The first voltage dividing module 110 and the second voltage dividing module 120 adopt high impedance resistors and obtain a higher voltage value of the signal to be detected, the third voltage dividing module 130 adopts low impedance resistors and obtain a lower voltage value of the signal to be detected, the first detection end TP1 is arranged at two ends of the third voltage dividing module 130 and is used for detecting the voltages at two ends of the third voltage dividing module 130, and when the voltages at two ends of the third voltage dividing module 130 are lower, the detection process has higher safety.
When the voltage division and collection circuit is used for detecting work, the voltage to be detected is sequentially transmitted to the first voltage division module 110, the third voltage division module 130 and the second voltage division module 120 through the input port a1 of the voltage division and collection circuit, and a voltage signal passing through the second voltage division module 120 is grounded. The adjacent two first detecting terminals TP1 detect the voltage value of the third voltage dividing module 130 through the connection detecting device, and since the impedance values of the first voltage dividing module 110, the second voltage dividing module 120 and the third voltage dividing module 130 can be preset, that is, the impedance ratio of the impedance of the third voltage dividing module 130 to the sum of the impedances of the first voltage dividing module 110, the second voltage dividing module 120 and the third voltage dividing module 130 can be determined, and the voltage value of the signal to be detected is determined according to the detected voltage value of the third voltage dividing module 130 and the preset impedance ratio. The voltage value of the third voltage division module 130 is obtained through one-time detection, so that the summation calculation process after multiple measurements is avoided, and the random error caused by the multiple measurements and the accumulated error of summation after the multiple measurements are reduced.
The voltage division acquisition circuit provided by the technical scheme of the embodiment comprises an input port, a first voltage division module, a second voltage division module, a third voltage division module and at least two first detection ends; the input port is used for inputting a signal to be detected; the first voltage dividing module and the second voltage dividing module are connected in series between the input port and the grounding end, and the third voltage dividing module is connected in series between the first voltage dividing module and the second voltage dividing module; the third voltage dividing module is connected with the first voltage dividing module and the second voltage dividing module respectively and is connected with the first detection end; the first detection ends are used for detecting the voltage value of the third voltage division module between two adjacent first detection ends; the voltage value of the third voltage division module is used for determining the voltage value of the signal to be detected in an impedance relation with the third voltage division module, the first voltage division module and the second voltage division module. The voltage value of the signal to be detected is determined by detecting the voltage values of the voltage dividing modules and the impedance relation among the voltage dividing modules, so that multiple measurement is avoided, random errors generated during multiple measurement are reduced, the measurement accuracy is improved, meanwhile, the voltage dividing modules in the voltage dividing acquisition circuit adopt pure resistor circuits, the circuit structure is simple, and the problem that the measurement method in the prior art is high in cost is solved.
Fig. 2 is a schematic structural diagram of a third voltage dividing module according to an embodiment of the present utility model, as shown in fig. 2, the third voltage dividing module 130 includes a first parallel branch 210, a second parallel branch 220, and a reference terminal VREF; the first parallel branch 210 and the second parallel branch 220 are connected in series between the first detection ends TP1; the reference terminal VREF is located at the connection point of the first parallel branch 210 and the second parallel branch 220, and is used for marking the voltage value of the signal to be detected.
In this embodiment, the first parallel branch 210 and the second parallel branch 220 include parallel resistors, where the parallel resistors in the first parallel branch 210 are the same as the parallel resistors in the second parallel branch 220, and referring to the above embodiment, when the resistors in the first voltage dividing module 110 and the second voltage dividing module 120 are the same, the reference terminal VREF at the connection point of the first parallel branch 210 and the second parallel branch 220 is a half reference terminal of the voltage value to be detected, and is used to mark the half voltage value of the signal to be detected.
In this embodiment, the resistances of the first parallel branch 210 and the second parallel branch 220 in the third voltage dividing module 130 are connected in parallel, so that the current of each parallel branch in the third voltage dividing module 130 is smaller, and the detection process is safer. The first parallel branch 210 and the second parallel branch 220 are symmetrical about the reference end VREF, and the detection accuracy of the signal to be detected is improved by measuring the voltage values of the first detection ends TP1 on two sides adjacent to the reference end VREF according to the same voltage values of the first detection ends TP1 on two sides adjacent to the reference end VREF and verifying the two detection results.
Fig. 3 is a circuit diagram of a third voltage dividing module according to an embodiment of the present utility model, as shown in fig. 3, a first parallel branch 210 includes at least two first resistors R1, where the first resistors R1 are connected in parallel; the second parallel branch 220 comprises at least two second resistors R2, the second resistors R2 being connected in parallel. The connection point between the second end of the first resistor R1 and the first end of the second resistor R2 is a reference end VREF, and the first end of the first resistor R1 and the second end of the second resistor R2 are respectively a first detection end TP1. The first resistor R1 and the second resistor R2 adopt small impedance resistors, so that the voltage values at two ends of the third voltage dividing module 130 are smaller, and meanwhile, the resistors of the first parallel branch 210 and the second parallel branch 220 adopt a parallel connection mode to further reduce the current of each parallel branch in the third voltage dividing module 130, so that the detection process is safer.
Fig. 4 is a circuit diagram of a first voltage dividing module according to an embodiment of the present utility model, as shown in fig. 4, the first voltage dividing module 110 includes a first end a2, a second end a3, and at least one third resistor R3, where the first end a2 is connected to the input port a1, the second end a3 is connected to the first detection end TP1, and the third resistor R3 is connected in series between the first end a2 and the second end a 3. The third resistor R3 may be a large-impedance resistor, so that the first voltage dividing module 110 divides a larger voltage. When the first voltage dividing module 110 divides a larger voltage, the voltage value of the first detection terminal TP1 connected to the first voltage dividing module 110 is smaller, thereby improving the safety of the detection process.
Referring to fig. 4, the voltage division collecting circuit further includes at least one second detecting end TP2, when the first voltage division module 110 includes at least two third resistors R3, the second detecting end TP2 is disposed between two adjacent third resistors R3, and the second detecting end TP2 is used for detecting, in combination with the first detecting end TP1, a voltage value of the third resistor R3 located between the second detecting end TP2 and the first detecting end TP1; alternatively, the second detecting terminal TP2 is configured to detect a voltage value of the third resistor R3 between two adjacent second detecting terminals TP 2.
In this embodiment, the voltage value to be detected can be determined by the detected voltage value at two ends of the third resistor R3 and the impedance ratio of the third resistor R3 to the sum of the impedances of the first voltage dividing module 110, the second voltage dividing module 120, and the third voltage dividing module 130. The first voltage dividing module 110 may be provided with a plurality of third resistors R3, and since the second detecting terminals TP2 are disposed between two adjacent third resistors R3, the number of the second detecting terminals TP2 is increased as the number of the third resistors R3 increases. By arranging the second detection end TP2, multiple times of detection can be performed, and the result of each detection is compared, so that the accuracy of the detection result is improved.
Fig. 5 is a circuit diagram of a second voltage dividing module according to an embodiment of the present utility model, as shown in fig. 5, the second voltage dividing module 120 includes a first end a4, a second end a5, and at least one fourth resistor R4, where the first end a4 is connected to the first detection end TP1, the second end a5 is connected to the ground, and the fourth resistor R4 is connected in series between the first end a4 and the second end a 5. The fourth resistor R4 may be a resistor with a large impedance, so that the second voltage dividing module 120 divides a larger voltage. When the second voltage dividing module 120 divides a larger voltage, the voltage value of the first detection terminal TP1 connected to the second voltage dividing module 120 is smaller, thereby improving the safety of the detection process.
Referring to fig. 5, the voltage division collecting circuit further includes at least one third detecting end TP3, and when the second voltage division module 120 includes at least two fourth resistors R4, the third detecting end TP3 is disposed between two adjacent fourth resistors R4, and the third detecting end TP3 is configured to detect, in combination with the first detecting end TP1, a voltage value of the fourth resistor R4 located between the third detecting end TP3 and the first detecting end TP1; alternatively, the third detecting terminal TP3 is configured to detect a voltage value of the fourth resistor R4 between two adjacent third detecting terminals TP 3.
In this embodiment, the voltage value to be detected can be determined by the detected voltage values of the two ends of the fourth resistor R4 and the impedance ratio of the fourth resistor R4 to the sum of the impedances of the first voltage dividing module 110, the second voltage dividing module 120, and the third voltage dividing module 130. The second voltage dividing module 120 may include a plurality of fourth resistors R4, and since the third detecting terminals TP3 are disposed between two adjacent fourth resistors R4, the number of the third detecting terminals TP3 increases as the number of the fourth resistors R4 increases. By arranging the third detection end TP3, multiple times of detection can be performed, and the result of each detection is compared, so that the accuracy of the detection result is improved.
On the basis of the embodiment, the voltage division acquisition circuit further comprises a first circuit protection module and a second circuit protection module, and the circuit protection module is used for filtering out high-frequency voltage components in the voltage division acquisition circuit. Fig. 6 is a schematic structural diagram of a circuit protection module according to an embodiment of the present utility model, as shown in fig. 6, a first circuit protection module 610 is connected between a first detection terminal TP1 and a ground terminal, and a second circuit protection module 620 is connected between the first detection terminal TP1 and the ground terminal. The first circuit protection module 610 and the second circuit protection module 620 each include a protection resistor and a filter capacitor, where the protection resistor is used to prevent the circuit from being damaged due to excessive current, and the RC low-pass filter formed by the protection resistor and the filter capacitor can filter out high-frequency components of the voltage, and place the high-frequency components to affect the accuracy of the detection result.
Fig. 7 is a circuit diagram of a circuit protection module according to an embodiment of the present utility model, as shown in fig. 7, a first circuit protection module 610 includes a fifth resistor R5 and a first capacitor C1, a first end of the fifth resistor R5 is connected to the first detection end TP1, a second end of the fifth resistor R5 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded; the second circuit protection module 620 includes a sixth resistor R6 and a second capacitor C2, a first end of the sixth resistor R6 is connected to the first detection end TP1, a second end of the sixth resistor R6 is connected to the first end of the second capacitor C2, and a second end of the second capacitor C2 is grounded. The fifth resistor R5 and the first capacitor C1 form a first RC low-pass filter, the sixth resistor R6 and the second capacitor C2 form a second RC low-pass filter, and the fifth resistor R5 and the sixth resistor R6 serve as protection resistors to prevent circuit damage when the current is overlarge, so that the voltage division acquisition circuit is safe and protected.
Fig. 8 is a circuit diagram of a voltage division and collection circuit according to an embodiment of the present utility model, as shown in fig. 8, the first voltage division module 110 includes four third resistors R3, and the second voltage division module 120 includes four fourth resistors R4; the first parallel branch 210 in the third voltage dividing module 130 includes two first resistors R1, and the second parallel branch 220 includes two second resistors R2. The voltage division acquisition circuit comprises two first detection ends TP1, three second detection ends TP2 and three third detection ends TP3, and a reference end VREF is arranged between the first resistor R1 and the second resistor R2 and is used as a halving reference end of a voltage value to be measured. The two first detection ends TP1 are respectively arranged at one end of the two first resistors R1 and one end of the two second resistors R2, the three second detection ends TP2 are respectively arranged between the four third resistors R3, and the three third detection ends TP3 are respectively arranged between the four fourth resistors R4. The connection point of the fifth resistor module R5 and the first capacitor C1 is provided with a fourth detection end TP4, and the connection point of the sixth resistor R6 and the second capacitor C2 is provided with a fifth detection end TP5, and since the fifth resistor module R5 and the sixth resistor R6 do not have the voltage dividing function in the voltage dividing acquisition circuit, the voltage value of the fourth detection end TP4 is the same as that of the first detection end TP1, and the voltage value of the fifth detection end TP5 is the same as that of the first detection end TP1.
In this embodiment, the third resistor R3 and the fourth resistor R4 have the same resistance values, the first resistor R1 and the second resistor R2 have the same resistance values, and the voltage division acquisition circuit adopts a symmetrical design with the reference terminal VREF as a center point. The voltage signal to be detected flows into the voltage division acquisition circuit from the input port a1, passes through the first voltage division module 110, the third voltage division module 130 and the second voltage division module 120, and is input to the ground terminal. The voltage at two ends of the resistor is detected by the detection ends arranged at two ends of the resistor, and the voltage value of the signal to be detected is determined according to the impedance ratio of the measured resistor to the sum of the impedances of the first voltage dividing module 110, the second voltage dividing module 120 and the third voltage dividing module 130. If a plurality of resistors are arranged between the detection points, the plurality of resistors are regarded as one resistor, and the impedance ratio of each resistor in the plurality of resistors and the total impedance of the voltage division acquisition circuit is added to obtain the impedance ratio of the plurality of resistors and the total impedance of the voltage division acquisition circuit, so that the voltage value of the signal to be detected can be obtained. For example, the voltage division ratio of the first resistor R1 and the second resistor R2 in the third voltage division module 130 (i.e., the impedance ratio of the resistor in the third voltage division module 130 to the total impedance of the voltage division acquisition circuit) is set to 0.08%, and the voltage division ratio of the third resistor R3 and the fourth resistor R4 (i.e., the impedance ratio of the resistor in the first voltage division module 110 and the second voltage division module 120 to the total impedance of the voltage division acquisition circuit) is set to 12.48%, respectively.
In this embodiment, the voltage division acquisition circuit adopts symmetrical design, and the circuit breaking investigation condition is unchangeable, and total voltage does not change when resistance short circuit, can predict the position of the resistance of short circuit through checking the resistance on one side for fault resistance control is in a small range, easily the debugging has reduced work load. Meanwhile, the voltage division acquisition circuit is simple in structure, only the resistor on one side of the two symmetrical sides is required to be designed, the voltage division acquisition circuit is uniform in structural distribution, and the stress is balanced when the voltage division acquisition circuit is subjected to collision, so that the circuit structure is effectively prevented from being damaged due to uneven stress.
Fig. 9 is a schematic structural diagram of a battery pack detection apparatus according to an embodiment of the present utility model, and as shown in fig. 9, a battery pack detection apparatus 900 includes a detection device 910 and a voltage division acquisition circuit 100.
In this embodiment, the battery pack detection device is a device for detecting a voltage of a battery pack, and since the high voltage output by the battery pack is easy to damage the detection device, the voltage division acquisition circuit divides the voltage output by the battery pack, and the detection device determines a voltage value to be detected by detecting the divided voltage. According to the utility model, the partial pressure acquisition circuit is applied to the battery pack detection equipment, so that multiple measurements are avoided, random errors generated during the multiple measurements are reduced, the measurement accuracy is improved, and meanwhile, the detection device is protected.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present utility model may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present utility model are achieved, and the present utility model is not limited herein.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (10)
1. A voltage dividing acquisition circuit, comprising:
the device comprises an input port, a first voltage division module, a second voltage division module, a third voltage division module and at least two first detection ends;
the input port is used for inputting a signal to be detected;
the first voltage dividing module and the second voltage dividing module are connected in series between the input port and the ground terminal, and the third voltage dividing module is connected in series between the first voltage dividing module and the second voltage dividing module; the third voltage division module is connected with the first voltage division module and the second voltage division module respectively and is connected with the first detection end;
the first detection ends are used for detecting the voltage value of the third voltage division module between two adjacent first detection ends; the voltage value of the third voltage division module is used for determining the voltage value of the signal to be detected by combining the impedance relation of the third voltage division module, the first voltage division module and the second voltage division module.
2. The voltage division acquisition circuit of claim 1 wherein the third voltage division module comprises a first parallel branch, a second parallel branch, and a reference terminal; the first parallel branch and the second parallel branch are connected in series between the first detection ends; the reference end is positioned at the connection point of the first parallel branch and the second parallel branch and is used for marking the voltage value of the signal to be detected.
3. The voltage divider acquisition circuit according to claim 2, wherein the first parallel branch comprises at least two first resistors, the first resistors being connected in parallel; the second parallel branch comprises at least two second resistors, which are connected in parallel.
4. The voltage divider acquisition circuit of claim 1 wherein the first voltage divider module comprises a first end, a second end, and at least one third resistor, the first end connected to the input port, the second end connected to the first detection end, the third resistor connected in series between the first end and the second end.
5. The partial pressure acquisition circuit of claim 4, further comprising: when the first voltage dividing module comprises at least two third resistors, a second detection end is arranged between two adjacent third resistors, and the second detection end is used for detecting the voltage value of the third resistor positioned between the second detection end and the first detection end in combination with the first detection end; or the second detection end is used for detecting the voltage value of the third resistor between two adjacent second detection ends.
6. The voltage divider acquisition circuit of claim 1 wherein the second voltage divider module comprises a first end, a second end, and at least one fourth resistor, the first end connected to the first detection end, the second end connected to the ground end, the fourth resistor connected in series between the first end and the second end.
7. The partial pressure acquisition circuit of claim 6, further comprising: when the second voltage dividing module comprises at least two fourth resistors, a third detection end is arranged between two adjacent fourth resistors, and the third detection end is used for detecting the voltage value of the fourth resistor positioned between the third detection end and the first detection end in combination with the first detection end; or the third detection end is used for detecting the voltage value of the fourth resistor between two adjacent third detection ends.
8. The voltage division acquisition circuit of claim 1, further comprising: a first circuit protection module and a second circuit protection module; the first circuit protection module is connected between the first detection end and the grounding end and is used for filtering out high-frequency voltage components; the second circuit protection module is connected between the first detection end and the grounding end and is used for filtering out high-frequency voltage components.
9. The voltage division and collection circuit according to claim 8, wherein the first circuit protection module comprises a fifth resistor and a first capacitor, a first end of the fifth resistor is connected to the first detection end, a second end of the fifth resistor is connected to the first end of the first capacitor, and a second end of the first capacitor is grounded; the second circuit protection module comprises a sixth resistor and a second capacitor, wherein a first end of the sixth resistor is connected with the first detection end, a second end of the sixth resistor module is connected with a first end of the second capacitor, and a second end of the second capacitor is grounded.
10. A battery pack detection apparatus comprising a detection device and the partial pressure acquisition circuit of any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320208703.8U CN219512375U (en) | 2023-01-16 | 2023-01-16 | Partial pressure acquisition circuit and battery pack detection equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320208703.8U CN219512375U (en) | 2023-01-16 | 2023-01-16 | Partial pressure acquisition circuit and battery pack detection equipment |
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| CN219512375U true CN219512375U (en) | 2023-08-11 |
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| CN202320208703.8U Active CN219512375U (en) | 2023-01-16 | 2023-01-16 | Partial pressure acquisition circuit and battery pack detection equipment |
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| CN (1) | CN219512375U (en) |
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