CN216351122U - Voltage detection circuit of lithium battery pack and lithium battery pack - Google Patents
Voltage detection circuit of lithium battery pack and lithium battery pack Download PDFInfo
- Publication number
- CN216351122U CN216351122U CN202122181847.2U CN202122181847U CN216351122U CN 216351122 U CN216351122 U CN 216351122U CN 202122181847 U CN202122181847 U CN 202122181847U CN 216351122 U CN216351122 U CN 216351122U
- Authority
- CN
- China
- Prior art keywords
- lithium battery
- module
- voltage
- battery pack
- detection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a voltage detection circuit of a lithium battery pack. The lithium battery pack comprises a plurality of lithium batteries connected in series; the voltage detection circuit comprises a plurality of voltage sampling modules; the system comprises a voltage sampling module, a microcontroller and a data processing module, wherein the voltage sampling module is correspondingly connected to two ends of a lithium battery and used for detecting voltage data of the two ends of the lithium battery and outputting the voltage data to the microcontroller; the microcontroller is configured to process the received voltage data. This application corresponds the voltage data who acquires each lithium cell group both ends in the lithium cell group through the voltage detection circuit who adopts including a plurality of voltage sampling modules, can reduce the deviation that connecting wire resistance brought between the adjacent two strings of lithium cells in traditional charge-discharge application, realizes the accurate measurement of lithium cell voltage. And finally, outputting the voltage data to a microcontroller for processing so as to protect or regulate the lithium battery pack subsequently. In addition, a lithium battery pack is also provided.
Description
Technical Field
The utility model relates to the technical field of lithium battery detection, in particular to a voltage detection circuit of a lithium battery pack and the lithium battery pack.
Background
A conventional AFE (Analog Front End) refers specifically to a Battery sampling chip in a BMS (Battery Management System) for collecting a cell voltage, a temperature, and the like. In the conventional AFE chip sampling line, only one sampling line can be led out from two adjacent strings of batteries, so that in practical charging and discharging applications, the resistance on the connecting line between the two adjacent strings can be calculated into the battery voltage together, so that the sampling value at the front end deviates from the true value, and the larger the current is, the larger the deviation is.
Therefore, how to solve the problem that the deviation between the front-end voltage sampling value and the real value is large is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need to provide a voltage detection circuit for a lithium battery pack, the lithium battery pack includes a plurality of lithium batteries connected in series; the detection circuit comprises a plurality of voltage sampling modules;
the system comprises a voltage sampling module, a microcontroller and a data processing module, wherein the voltage sampling module is correspondingly connected to two ends of a lithium battery and used for detecting voltage data of the two ends of the lithium battery and outputting the voltage data to the microcontroller;
the microcontroller is configured to process the received voltage data.
Above-mentioned lithium cell group voltage detection circuit corresponds the voltage data who acquires each lithium cell both ends in the lithium cell group through the voltage detection circuit who adopts including a plurality of voltage sampling modules, can reduce the deviation that the connecting wire resistance brought between two adjacent strings of lithium cells in traditional charge-discharge application, realizes the accurate measurement of lithium cell voltage. And finally, outputting the voltage data to a microcontroller for processing so as to protect or regulate the lithium battery pack subsequently.
In one embodiment, the method further comprises the following steps:
and the power supply module is connected with each voltage sampling module and used for providing electric energy for each voltage sampling module.
In one embodiment, the power supply module is further electrically connected to the lithium battery pack, and the step of supplying power to each voltage sampling module is to supply power of the lithium battery pack to each voltage sampling module.
In one embodiment, the method further comprises the following steps:
and the protection module is connected between the voltage sampling module and the microcontroller.
In one embodiment, the system further comprises a plurality of switch modules;
the switching module is correspondingly connected between the lithium battery and the voltage sampling module, and is configured to turn on or turn off a circuit where the voltage sampling module is located.
In one embodiment, the voltage sampling module comprises a filtering module and an operational amplifier module;
the filtering module is connected with the switch module, and the operational amplifier module is connected with the filtering module.
In one embodiment, the switch module includes two switch units, and the two switch units are respectively marked as a first switch unit and a second switch unit; the lithium battery comprises a first end and a second end;
the input end of the first switch unit is connected with the first end, and the input end of the second switch unit is connected with the second end;
the output end of the first switch unit is connected with the operational amplifier module; and the output end of the second switch unit is connected with the operation module.
In one embodiment, the operational amplifier module comprises an operational amplifier UD;
the same-direction input end of the operational amplifier UD is connected with the output end of the first switch unit;
the inverting input end of the operational amplifier UD is connected with the output end of the second switch unit;
the output end of the operational amplifier UD is connected with the microcontroller.
Based on the same inventive concept, the application also provides a lithium battery pack, which comprises a plurality of lithium batteries connected in series and a lithium battery pack voltage detection circuit as described in any one of the above;
the lithium battery pack voltage detection circuit is configured to detect voltage data across each of the lithium batteries.
In one embodiment, the system further comprises a lithium battery pack management system;
the lithium battery pack management system comprises a microcontroller;
and the microcontroller is connected with the lithium battery pack voltage detection circuit and is used for processing voltage data of two ends of each lithium battery detected by the lithium battery pack voltage detection circuit.
Above-mentioned lithium cell group, through adopting aforementioned voltage detection circuit who describes, and this detection circuitry corresponds the voltage data who acquires each lithium cell both ends in the lithium cell group through the voltage detection circuit who adopts including a plurality of voltage sampling modules, can reduce the deviation that the connecting wire resistance brought between two adjacent strings of lithium cells in traditional charge-discharge application, realizes the accurate measurement of lithium cell voltage. And finally, outputting the voltage data to a microcontroller for processing so as to protect or regulate the lithium battery pack subsequently.
Drawings
FIG. 1 is a block diagram of a lithium battery pack voltage detection circuit according to an embodiment;
FIG. 2 is a block diagram of a lithium battery voltage detection circuit according to another embodiment;
fig. 3 is a schematic circuit diagram of a first switch unit, a second switch unit, a filter module and an operational amplifier module in an embodiment;
fig. 4 is a circuit schematic diagram of a power supply module in an embodiment.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
A conventional AFE (Analog Front End) refers specifically to a Battery sampling chip in a BMS (Battery Management System) for collecting Battery voltage, temperature, and the like. In the conventional AFE chip sampling line, only one sampling line can be led out from two adjacent strings of batteries, so that in practical charging and discharging applications, the resistance on the connecting line between the two adjacent strings of batteries can be calculated into the battery voltage together, so that the front-end sampling value is deviated from the true value, and the larger the current is, the larger the deviation is.
In view of the above, the present application is intended to provide a new solution to the above-mentioned technical problem, and the specific structure thereof will be described in detail in the following embodiments.
Referring to fig. 1, a schematic diagram of a lithium battery pack battery voltage detection circuit according to the present disclosure is shown. In the figure, the lithium battery pack can comprise a plurality of lithium batteries B1, B2, B3, B4, B5 and … which are connected in series; the detection circuit may include a number of voltage sampling modules 1002, 1004, 1006, 1008, 1010, …;
wherein, a voltage sampling module is correspondingly connected with two ends of a lithium battery; as shown in the figure, the voltage sampling module 1002 is connected to two ends of the lithium battery B1, the voltage sampling module 1004 is connected to two ends of the lithium battery B2, the voltage sampling module 1006 is connected to two ends of the lithium battery B3, the voltage sampling module 1008 is connected to two ends of the lithium battery B4, and the voltage sampling module 1010 is connected to two ends of the lithium battery B5. Each voltage sampling module 1002, 1004, 1006, 1008, 1010, … is mainly used for detecting voltage data (not shown) at two ends of a corresponding lithium battery and outputting the voltage data to a microcontroller 20;
the microcontroller 20 is configured to process the received voltage data.
Specifically, the microcontroller 20 may perform charge and discharge protection and the like according to the corresponding voltage data acquired by each voltage sampling module 1002, 1004, 1006, 1008, 1010, ….
Above-mentioned lithium cell group voltage detection circuit corresponds the voltage data who obtains each lithium cell both ends in the lithium cell group through adopting the voltage detection circuit who includes a plurality of voltage sampling modules 1002, 1004, 1006, 1008, 1010, …, can reduce the deviation that the connecting wire resistance brought between two adjacent strings of lithium cells in traditional charge-discharge application, realizes the accurate measurement of lithium cell voltage. And finally, outputting the voltage data to a microcontroller for processing so as to protect or regulate the lithium battery pack subsequently.
Referring to fig. 2 and 3, fig. 2 is a schematic block diagram of a lithium battery pack voltage detection circuit according to another embodiment of the present disclosure, and fig. 3 is a schematic circuit diagram of a first switch unit, a second switch unit, a filter module and an operational amplifier module according to the present disclosure. The lithium battery pack voltage detection circuit of the present application may further include a plurality of switch modules (not shown);
and one switch module is correspondingly connected between the lithium battery and the voltage sampling module. The switch module is configured to turn on or off a circuit where the voltage sampling module is located. Further, the switch module may include at least one MOS transistor.
Further, with continuing reference to fig. 2 and 3, the voltage sampling module may include a filtering module and an operational amplifier module; taking the voltage sampling module 1002 as an example, the voltage sampling module 1002 may include a filtering module 1002a and an operational amplifier module 1002 b.
The filtering module 1002a is connected with the switch module, and the operational amplifier module 1002b is connected with the filtering module 1002 a. The filtering module 1002a is configured to filter the voltage data, and the operational amplifier module 1002b is configured to perform operational amplification on the filtered voltage data.
In one embodiment, with continued reference to fig. 2 and 3, the switch module includes two switch units, which are respectively identified as a first switch unit and a second switch unit; the lithium battery comprises a first end and a second end;
the input end of the first switch unit is connected with the first end, and the input end of the second switch unit is connected with the second end;
the output end of the first switch unit is connected with the operational amplifier module; and the output end of the second switch unit is connected with the operation module.
Specifically, taking the switch module and the lithium battery B1 connected to the voltage sampling module 1002 as an example, the switch module includes a first switch unit 512 and a second switch unit 514, an input end of the first switch unit 512 is connected to a first end of the lithium battery B1, and an input end of the second switch unit 514 is connected to a second end of the lithium battery B1. The output end of the first switch unit 512 is connected to the operational amplifier module 1002b (a filter module 1002a is also arranged in the middle); the output terminal of the second switching unit 514 is connected to the operation module 1002 b. The specific circuit principle of the first switch unit 512 and the second switch unit 514 can be understood with reference to fig. 3, and the detailed description thereof is omitted here.
In one embodiment, the operational amplifier module comprises an operational amplifier UD;
the same-direction input end of the operational amplifier UD is connected with the output end of the first switch unit;
the inverting input end of the operational amplifier UD is connected with the output end of the second switch unit;
the output end of the operational amplifier UD is connected with the microcontroller.
Specifically, referring to fig. 3 for assistance, similarly taking the switch module and the lithium battery B1 connected to the voltage sampling module 1002 as an example, the operational amplifier module in the voltage sampling module 1002 mainly includes an operational amplifier UD3 and other electronic devices, such as a resistor and a capacitor, and connection relationships among the devices can be understood with reference to fig. 3, which is not described herein again.
The same-direction input terminal 1 of the operational amplifier UD1 is connected to the output terminal of the first switching unit 1002 a; an inverting input terminal 3 of the operational amplifier UD1 is connected to the output terminal of the second switching unit 1002 b; output 4 of operational amplifier UD1 is connected to microcontroller 20.
In one embodiment. The lithium battery pack voltage detection circuit may further include a power supply module 30, where the power supply module 30 is connected to each of the voltage sampling modules 1002, 1004, 1006, 1008, 1010, …, and is configured to provide power for each of the voltage sampling modules 1002, 1004, 1006, 1008, 1010, …. The circuit diagram of the power supply module 30 can be understood with reference to fig. 4, and the detailed description thereof is omitted here.
Further, as shown in fig. 2, the power supply module 30 of the present application is also electrically connected to the lithium battery pack, and the step of supplying the power to each of the voltage sampling modules 1002, 1004, 1006, 1008, 1010, … is to supply the power of the lithium battery pack to each of the voltage sampling modules 1002, 1004, 1006, 1008, 1010, ….
The traditional AFE chip working voltage requires more than 8V, so that the system cannot work normally when the low-serial-number battery is at low voltage, and the lithium battery pack is used for supplying power to each voltage sampling module in the scheme, particularly the operational amplifier in the voltage sampling module is directly supplied with power by the battery, so that the working voltage of the system can be reduced to 5V or even lower.
In one embodiment, with continued reference to fig. 2, the lithium battery pack voltage detection circuit of the present application may further include a protection module connected between the voltage sampling module and the microcontroller. As shown in fig. 2, since the number of the voltage sampling modules is plural, and accordingly, the number of the protection modules is the same as the number of the voltage sampling modules, the number of the protection modules is plural, that is, the protection modules 410, 420, 430, 440, … in fig. 2. The protection module may include a zener diode (not shown) and a filter capacitor (not shown).
Compared with the traditional BMS voltage sampling circuit, the utility model leads out two voltage sampling lines on each string of batteries, effectively reduces the problem of inaccurate voltage sampling caused by the impedance on the connecting wires of the two strings of batteries, and in addition, a switch module is added on each battery sampling line, thereby reducing the power consumption of a single string of batteries in a sampling mode.
Based on the same inventive concept, the present application further provides a lithium battery pack (not shown), which includes a plurality of lithium batteries connected in series and a lithium battery pack voltage detection circuit according to any one of the foregoing embodiments;
the lithium battery pack voltage detection circuit is configured to detect voltage data across each of the lithium batteries.
In one embodiment, the system further comprises a lithium battery pack management system;
the lithium battery pack management system comprises a microcontroller;
and the microcontroller is connected with the lithium battery pack voltage detection circuit and is used for processing voltage data of two ends of each lithium battery detected by the lithium battery pack voltage detection circuit.
Above-mentioned lithium cell group, through adopting aforementioned voltage detection circuit who describes, and this detection circuitry corresponds the voltage data who acquires each lithium cell group both ends in the lithium cell group through the voltage detection circuit who adopts including a plurality of voltage sampling modules, can reduce the deviation that the connecting wire resistance brought between the adjacent two strings of lithium cells in traditional charge-discharge application, realize the accurate measurement of lithium cell voltage. And finally, outputting the voltage data to a microcontroller for processing so as to protect or regulate the lithium battery pack subsequently. In addition, a switch module is added to each battery sampling line, so that the power consumption of a single battery string in a sampling mode is reduced.
In order to facilitate understanding of the working principle of the present application, the working principle of the present application will be described with reference to fig. 3 and 4.
As shown in fig. 3 and 4, during one sampling period, the microcontroller 20 gives a high level to the power supply module 30, the first switching unit 512 and the second switching unit 514 through the VCC _ ON pin and the CS pin; the N-MOS tube M2 in the power supply module 30 correspondingly receives the high level and then the DS pole is conducted, and correspondingly the G pole level of the P-MOS tube M1 is pulled down to 0V, so that the DS pole of the P-MOS tube M1 is conducted, and power is supplied to the operational amplifier UD1 through the filter capacitor CD 8; after the CS pin provides a high level, the corresponding transistor Q1 is turned on with the CE electrode of the transistor Q5, so that the DS electrodes of the MOS transistor MD1 and the MOS transistor MD5 are turned on, and a battery voltage signal passes through the filter capacitor CD6 and then enters the reverse input terminal 3 and the same-direction input terminal 1 of the operational amplifier UD1, and is output through a differential short circuit, and is transmitted to the microcontroller 20 after passing through the zener diode and the filter capacitor in the protection module, so that the microcontroller 20 can accurately collect the transmitted analog signal, and finally, the collected analog signal is processed by the microcontroller 20.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A voltage detection circuit of a lithium battery pack comprises a plurality of lithium batteries connected in series; the detection circuit is characterized by comprising a plurality of voltage sampling modules;
the system comprises a voltage sampling module, a microcontroller and a data processing module, wherein the voltage sampling module is correspondingly connected to two ends of a lithium battery and used for detecting voltage data of the two ends of the lithium battery and outputting the voltage data to the microcontroller;
the microcontroller is configured to process the received voltage data.
2. The lithium battery pack voltage detection circuit of claim 1, further comprising:
and the power supply module is connected with each voltage sampling module and used for providing electric energy for each voltage sampling module.
3. The lithium battery pack voltage detection circuit of claim 2, wherein the power supply module is further electrically connected to the lithium battery pack, and the power supply module is configured to provide power to each of the voltage sampling modules by providing power from the lithium battery pack to each of the voltage sampling modules.
4. The lithium battery pack voltage detection circuit of claim 1, further comprising:
and the protection module is connected between the voltage sampling module and the microcontroller.
5. The lithium battery pack voltage detection circuit according to claim 1, further comprising a plurality of switch modules;
the switching module is correspondingly connected between the lithium battery and the voltage sampling module, and is configured to turn on or turn off a circuit where the voltage sampling module is located.
6. The lithium battery pack voltage detection circuit according to claim 5, wherein the voltage sampling module comprises a filtering module and an operational amplifier module;
the filtering module is connected with the switch module, and the operational amplifier module is connected with the filtering module.
7. The lithium battery pack voltage detection circuit according to claim 6, wherein the switch module comprises two switch units, and the two switch units are respectively marked as a first switch unit and a second switch unit; the lithium battery comprises a first end and a second end;
the input end of the first switch unit is connected with the first end, and the input end of the second switch unit is connected with the second end;
the output end of the first switch unit is connected with the operational amplifier module; and the output end of the second switch unit is connected with the operational amplifier module.
8. The lithium battery pack voltage detection circuit according to claim 7, wherein the operational amplifier module comprises an operational amplifier UD;
the same-direction input end of the operational amplifier UD is connected with the output end of the first switch unit;
the inverting input end of the operational amplifier UD is connected with the output end of the second switch unit;
the output end of the operational amplifier UD is connected with the microcontroller.
9. A lithium battery comprising a plurality of lithium batteries connected in series and a lithium battery voltage detection circuit according to any one of claims 1 to 8;
the lithium battery pack voltage detection circuit is configured to detect voltage data across each of the lithium batteries.
10. A lithium battery according to claim 9, further comprising a lithium battery management system;
the lithium battery pack management system comprises a microcontroller;
and the microcontroller is connected with the lithium battery pack voltage detection circuit and is used for processing voltage data of two ends of each lithium battery detected by the lithium battery pack voltage detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122181847.2U CN216351122U (en) | 2021-09-09 | 2021-09-09 | Voltage detection circuit of lithium battery pack and lithium battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122181847.2U CN216351122U (en) | 2021-09-09 | 2021-09-09 | Voltage detection circuit of lithium battery pack and lithium battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216351122U true CN216351122U (en) | 2022-04-19 |
Family
ID=81171044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122181847.2U Active CN216351122U (en) | 2021-09-09 | 2021-09-09 | Voltage detection circuit of lithium battery pack and lithium battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216351122U (en) |
-
2021
- 2021-09-09 CN CN202122181847.2U patent/CN216351122U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1977263B1 (en) | Device for monitoring cell voltage | |
| CN108808780B (en) | Lithium battery pack battery management system for solar panel | |
| CN201508409U (en) | Intelligent battery data logging device | |
| CN102735915B (en) | Battery voltage detector and battery voltage detection method | |
| CN104734228A (en) | Solar panel measuring circuit of solar charge controller of common positive pole structure | |
| CN110571487A (en) | battery and automobile diagnosis panel | |
| CN216351122U (en) | Voltage detection circuit of lithium battery pack and lithium battery pack | |
| CN210109275U (en) | Battery pack fault detection and feedback circuit | |
| WO2023109314A1 (en) | Recognition circuit, battery management system, battery pack, and electronic device | |
| CN206960628U (en) | A kind of integrated data acquisition unit for battery management system | |
| CN115241950A (en) | Lithium battery management circuit based on MCU | |
| CN101795009B (en) | Battery charging device and method thereof | |
| CN210744088U (en) | Battery and automobile diagnosis panel | |
| CN203800651U (en) | Electric automobile lithium iron phosphate battery pack energy balance control system | |
| CN110365076B (en) | Charging circuit capable of intelligently detecting maximum output charging current of charger | |
| CN208421112U (en) | A kind of battery pack gathering line wire breakage detector | |
| CN218216729U (en) | Lithium battery management circuit | |
| CN217770050U (en) | Multi-key control circuit | |
| CN218995622U (en) | Battery internal resistance parameter measuring circuit and battery internal resistance measuring device | |
| CN212098519U (en) | Power management system of lithium ion battery | |
| CN219417591U (en) | Single battery voltage detection circuit and battery detection chip | |
| CN216696594U (en) | Battery discharge abnormity counting device | |
| CN214069631U (en) | Multi-lithium battery disconnection protection system | |
| CN217882927U (en) | Charger and reverse connection prevention protection circuit thereof | |
| CN214674467U (en) | Lithium battery charging and discharging management circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |