CN217879562U - Battery insulation sampling circuit and device - Google Patents
Battery insulation sampling circuit and device Download PDFInfo
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- CN217879562U CN217879562U CN202220595837.5U CN202220595837U CN217879562U CN 217879562 U CN217879562 U CN 217879562U CN 202220595837 U CN202220595837 U CN 202220595837U CN 217879562 U CN217879562 U CN 217879562U
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Abstract
The utility model provides an insulating sampling circuit of battery, device and system, include: the circuit comprises a first resistance branch circuit, a second resistance branch circuit, a third resistance branch circuit and a sampling module; one end of the first resistance branch circuit is connected with the anode of the battery to be tested, one end of the second resistance branch circuit and one end of the third resistance branch circuit are connected with the cathode of the battery to be tested, and the other end of the first resistance branch circuit is connected with the other end of the second resistance branch circuit and the other end of the third resistance branch circuit and connected with the frame potential; the sampling module is connected with the second resistance branch in parallel. The utility model discloses only use a high tension switchgear, it is with low costs to use two high tension switchgear in comparison with national standard insulation detection circuit to only gather the voltage of a point, reduced the complexity of sampling, reduced sampling resource usage simultaneously.
Description
Technical Field
The utility model relates to a battery test technical field specifically, relates to an insulating sampling circuit of battery and device.
Background
In order to improve the working capacity of a motor in the field of new energy, the voltage of a power supply battery pack is very high in series, usually hundreds of volts; in the face of such high voltage, if leakage accidents occur, very large personnel and property safety problems can be caused, so that the electric vehicle is required to constantly detect the insulating performance of the battery pack in the international standard, and a corresponding detection circuit is issued to help the vehicle enterprises to meet the international standard.
An insulation detection circuit is introduced in the national standard GB/T18384-2020, an insulation detection bridge is used for respectively switching an upper switch and a lower switch, the voltage division value of a voltage division resistor on the insulation bridge is detected through an ADC, and the insulation resistance value can be calculated through a corresponding derivation formula. Although the current of the switch in the circuit is small, the voltage withstanding value is high, and the cost is high because the requirement of vehicle regulations needs to be met.
In chinese patent publication No. CN207946504U, an insulation resistance testing device for an electric vehicle power battery pack is disclosed, which is provided with a first testing line, a second testing line, a third testing line, a first fuse, a second fuse, a first testing contact, a second testing contact, a third testing contact, a first testing resistor, a second testing resistor, a first switch and a second switch. However, the testing device provided by the document still needs to control a plurality of switches during measurement, and the final insulation resistance value of the battery pack is measured according to the readings of a plurality of multimeters.
In chinese patent publication No. CN213658937U, a battery system insulation detection circuit is disclosed, which comprises a voltage division circuit and a switch circuit, wherein the voltage division circuit comprises a plurality of resistors connected in series, and two ends of the voltage division circuit are respectively connected to a high potential end and a low potential end of the battery system; the switch circuit is connected with the voltage division circuit in parallel, and comprises a first switch, a second switch, a first resistor, a second resistor, a third resistor and a fourth resistor; the first switch and the second resistor form a parallel circuit; the first end of the parallel circuit is connected with the high-potential end of the battery system through the first resistor; the second end of the parallel circuit is connected with the low-potential end of the battery system through a series circuit formed by a third resistor and a fourth resistor, and one end of the fourth resistor is connected with the low-potential end of the battery system; the second end of the parallel circuit is connected with the insulated reference end of the insulated circuit through the second switch. The measuring circuit in this document requires a large number of components and there is still room for optimization.
There is a need for a battery insulation resistance measuring device with a simpler circuit structure and more convenient measurement.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing an insulating sampling circuit of battery and device.
According to the utility model provides a pair of battery insulation sampling circuit, include: the circuit comprises a first resistance branch circuit, a second resistance branch circuit, a third resistance branch circuit and a sampling module;
one end of the first resistance branch is connected with the anode of the battery to be tested, one end of the second resistance branch and one end of the third resistance branch are connected with the cathode of the battery to be tested, and the other end of the first resistance branch is connected with the other end of the second resistance branch and the other end of the third resistance branch and connected with the frame potential;
the sampling module is connected with the second resistance branch in parallel.
Preferably, one end of the third resistance branch is connected with the anode of the battery to be tested.
Preferably, the first resistor branch is composed of one resistor R1, or is composed of a plurality of resistors R1 connected in series.
Preferably, the second resistance branch comprises a resistor R2 and a resistor R3, the first resistance branch is connected to one end of the resistor R2, the other end of the resistor R2 is connected with the resistor R3, the other end of the resistor R3 is connected with the negative electrode of the tested battery, and the sampling module is connected with the resistor R3 in parallel.
Preferably, the third branch comprises a resistor R4 and a switch S1, one end of the resistor R4 is connected to the frame potential, the other end of the resistor R4 is connected to one end of the switch S1, and the other end of the switch S1 is connected to the battery to be tested.
Preferably, the sampling module is an ADC sampling module.
Preferably, the switch S1 is any one of a photo relay switch, a relay switch or an opto-coupler switch.
Preferably, the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are megaohm resistors.
According to the utility model provides an insulating sampling device of battery, including foretell insulating sampling circuit of battery.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model provides a circuit structure is simple, only uses a high voltage switch, compares and uses two high voltage switch with low costs in national standard insulation detection circuit.
2. The utility model provides a scheme only gathers the voltage of a point, compares in the national standard insulation detection circuit, has reduced the complexity of sampling, has reduced the sampling resource use simultaneously.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a structural diagram of a battery insulation sampling circuit in embodiment 1 of the present invention;
fig. 2 is a structure diagram of the battery insulation sampling circuit in embodiment 2 of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
The utility model provides an insulating sampling circuit of battery, include: the circuit comprises a first resistance branch circuit, a second resistance branch circuit, a third resistance branch circuit and a sampling module;
one end of the first resistance branch circuit is connected with the anode of the battery to be tested, one end of the second resistance branch circuit and one end of the third resistance branch circuit are connected with the cathode of the battery to be tested, and the other end of the first resistance branch circuit is connected with the other end of the second resistance branch circuit and the other end of the third resistance branch circuit and connected with the frame potential; the sampling module is connected with the second resistance branch in parallel.
Wherein:
the first resistor branch is a resistor R1, and may also be formed by connecting a plurality of resistors R1 in series, and a suitable number of resistors R1 are selected according to the voltage of the battery to be tested, so as to improve the application range of the circuit, and a single resistor R1 is used for description in this embodiment.
The second resistance branch consists of a resistor R2 and a resistor R3, the sampling module is connected in parallel with the second resistance branch, and may be that the sampling module is connected in parallel with R3 in the second resistance branch or connected in parallel with R2 in the second resistance branch.
The third branch resistance consists of a resistor R4 and a switch S1, and the sampling module may be a voltage sampling module for detecting the voltage of the resistor R3 in the second resistance branch.
In one possible embodiment, for example, referring to fig. 1, one end of the resistor R1 is connected to the positive electrode of the battery U to be tested, one end of the resistor R2 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the negative electrode of the battery U to be tested, and the other end of the resistor R2 is connected to the other end of the resistor R1 and connected to the frame potential GND; one end of the resistor R4 is connected with one end of the switch S1, the other end of the resistor R4 is connected with the frame potential GND, and the other end of the switch S1 is connected with the negative electrode of the battery U to be tested; the ADC sampling module is connected with a resistor R3 in parallel.
The test principle of the circuit is as follows: firstly, the switch S1 is turned off, and the voltage of the ADC sampling module acquisition resistor R3 is recorded as U Detect off Then, the switch S1 is closed, and the voltage of the resistance R3 collected by the ADC sampling module is recorded as U Side test ，U General (1) And Rp is the total voltage of the battery, rp is the insulation resistance of the positive electrode of the tested battery U, and Rn is the insulation resistance of the negative electrode of the tested battery U. According to the circuit structure:
the insulation resistances Rp and Rn can be found by simultaneous equations (1) and (2):
in this embodiment, through setting up first resistance branch road for the voltage that the collection unit gathered is in suitable within range, and has improved the electric current of resistance R3 department through first resistance branch road, thereby is convenient for measure.
In another possible embodiment, in the test circuit, one end of the resistor R4 in the third branch resistor may be connected to the positive electrode of the battery U to be tested, the other end of the resistor R4 is connected to the switch S1, and the other end of the switch S1 is connected to GND, see fig. 2. The specific test procedure is the same as that in embodiment 1, and the following equation is obtained according to the circuit structure:
simultaneous equations (3) and (4) can be used to determine the insulation resistances Rp and Rn:
in the above two embodiments, the switch S1 may be any one of an optical relay switch, a relay switch, or an optical coupler switch, or may be another type of high-voltage switch. The resistor R1, the resistor R2, the resistor R3, and the resistor R4 are megaohm resistors, such as 1M Ω,3M Ω, or 5M Ω, and the above specific resistance values are only for illustration, and the embodiment of the application is not limited thereto, and the megaohm resistors can improve the test accuracy.
The utility model also introduces a battery insulation sampling device, contain foretell battery insulation sampling circuit in the device, the device can be fixed measuring device, can also be portable measuring device.
The foregoing descriptions have been directed to embodiments of the present invention. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the essential spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A battery insulation sampling circuit, comprising: the circuit comprises a first resistance branch circuit, a second resistance branch circuit, a third resistance branch circuit and a sampling module;
one end of the first resistance branch is connected with the anode of the battery to be tested, one end of the second resistance branch and one end of the third resistance branch are connected with the cathode of the battery to be tested, and the other end of the first resistance branch is connected with the other end of the second resistance branch and the other end of the third resistance branch and connected with the frame potential;
the sampling module is connected with the second resistance branch in parallel.
2. The battery insulation sampling circuit of claim 1, wherein: one end of the third resistance branch is connected with the anode of the battery to be tested.
3. The battery insulation sampling circuit of claim 1, wherein: the first resistor branch is composed of a resistor R1 or a plurality of resistors R1 connected in series.
4. The battery insulation sampling circuit of claim 1, wherein: the second resistance branch circuit comprises a resistor R2 and a resistor R3, one end of the resistor R2 is connected with the first resistance branch circuit, the other end of the resistor R2 is connected with the resistor R3, the other end of the resistor R3 is connected with the negative electrode of the tested battery, and the sampling module is connected with the resistor R3 in parallel.
5. The battery insulation sampling circuit of claim 1, wherein: the third resistance branch comprises a resistor R4 and a switch S1, one end of the resistor R4 is connected with the frame potential, the other end of the resistor R4 is connected with one end of the switch S1, and the other end of the switch S1 is connected with a tested battery.
6. The battery isolation sampling circuit of claim 1 or 2, wherein: the sampling module is an ADC sampling module.
7. The battery insulation sampling circuit of claim 5, wherein: the switch S1 is any one of an optical relay switch, a relay switch or an optical coupling switch.
8. The battery insulation sampling circuit according to any one of claims 3 to 5, wherein: the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are megaohm resistors.
9. The utility model provides an insulating sampling device of battery which characterized in that: comprising a battery isolation sampling circuit according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220595837.5U CN217879562U (en) | 2022-03-18 | 2022-03-18 | Battery insulation sampling circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220595837.5U CN217879562U (en) | 2022-03-18 | 2022-03-18 | Battery insulation sampling circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217879562U true CN217879562U (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220595837.5U Active CN217879562U (en) | 2022-03-18 | 2022-03-18 | Battery insulation sampling circuit and device |
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| Country | Link |
|---|---|
| CN (1) | CN217879562U (en) |
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2022
- 2022-03-18 CN CN202220595837.5U patent/CN217879562U/en active Active
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