CN217305458U - Lithium battery pack detection device - Google Patents
Lithium battery pack detection device Download PDFInfo
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- CN217305458U CN217305458U CN202220332411.0U CN202220332411U CN217305458U CN 217305458 U CN217305458 U CN 217305458U CN 202220332411 U CN202220332411 U CN 202220332411U CN 217305458 U CN217305458 U CN 217305458U
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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 relates to a lithium cell group detection area, especially a lithium cell group detection device, including control circuit and detection module, detection module includes first detection module and a n second detection module. The utility model discloses a control circuit adjustment detects the parameter, can satisfy different types of lithium cell detection protection to and different types of battery cluster uses. And simultaneously the utility model discloses a plurality of detection module and wherein electronic switch can detect every lithium cell among a plurality of lithium cell group simultaneously to monitor whole lithium battery system at any time, realize the screening maintenance to bad battery, and the hardware is with low costs, and it is high to detect the precision, is favorable to mass production.
Description
Technical Field
The utility model relates to a lithium cell group detection area, especially a lithium cell group detection device.
Background
At present, lithium batteries are widely applied in various fields, but most of the existing lithium battery voltage detection devices are special detection devices, and the compatibility is poor, namely, the lithium batteries of all types need the voltage detection devices of corresponding types. The following two commonly used prior art schemes are available:
common mode measuring method
The common mode measurement is to measure the voltage of each point by using the equal proportional attenuation of a precision resistor relative to the same reference point, and then the voltage of each battery is obtained by subtracting the voltages in sequence. The circuit of the method is simpler, but the measurement precision is reduced in equal proportion, and the accumulated error is often caused, so that the method cannot meet the requirement. Therefore, the method is only suitable for occasions with a small number of batteries connected in series or low requirements on measurement accuracy. The electric energy of the battery is consumed, the calibration and debugging of the factory are needed, and the labor cost is wasted in batch production.
Second, optical coupling relay array collection
An optical coupling relay is adopted to form an acquisition array, a decoder is used outside to gate a certain path of measurement, and the measurement is processed by a differential amplification circuit; the method uses a large number of optical coupling relays, the size of the optical coupling relays is large, grouping isolation is needed, hardware cost is high, and mass production is not facilitated.
Therefore, a lithium battery pack detection device which has strong compatibility and can detect single lithium batteries in a plurality of lithium battery packs in batch is needed nowadays.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exist among the prior art, provide a lithium cell group detection device.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
a lithium battery pack detection device comprises a control circuit and detection modules, wherein the detection modules comprise a first detection module and n second detection modules;
the first detection module comprises an electronic switch, a differential amplifier and a sampling assembly which are electrically connected in sequence;
the second detection module comprises an electronic switch, an isolation unit, a differential amplifier and a sampling assembly which are electrically connected in sequence; wherein n is a natural number;
the control circuit is used for adjusting the detection parameters of the detection module and is in communication connection with the detection module; the detection parameters include a maximum charging voltage and a termination discharging voltage. The utility model discloses a control circuit adjustment detects the parameter, can satisfy different types of lithium cell detection protection to and different types of battery cluster uses. And simultaneously the utility model discloses a plurality of detection module and wherein electronic switch can detect every lithium cell among a plurality of lithium cell group simultaneously to monitor whole lithium battery system at any time, realize the screening maintenance to bad battery, and the hardware is with low costs, and it is high to detect the precision, is favorable to mass production.
As the utility model discloses a preferred scheme still includes communication module, communication module is bluetooth module or communication serial ports. The utility model discloses a set up communication module and make the staff can remote control the device detects, and staff's accessible cell-phone (bluetooth) or host computer (communication serial ports) set up the detection parameter and the detection quantity of group battery to make to detect simple and efficient more.
As the preferred embodiment of the present invention, the electronic switch in the first detection module and the second detection module is an ADG507 high-speed analog multiplexer, and the second detection module is connected to the RC filter circuit at the S5A end of the ADG507 high-speed analog multiplexer.
As a preferred embodiment of the present invention, the differential amplifier is an LM321 operational amplifier.
As a preferred embodiment of the present invention, the first input terminal of the LM321 operational amplifier is connected to the first resistor and then connected to the DB + port of the ADG507 high-speed analog multiplexer; the second input end of the LM321 operational amplifier is connected with a second resistor and then connected with a DB-port of the ADG507 high-speed analog multiplexer, and the second input end of the LM321 operational amplifier is connected with a third resistor and then connected with the output end of the LM321 operational amplifier; the output end of the LM321 operational amplifier is connected with a fourth resistor, a capacitor and a voltage stabilizing diode in parallel in sequence and then is grounded;
the output end of the LM321 operational amplifier of the first detection module is connected with the fourth resistor and then connected with the sampling assembly; and the output end of the LM321 operational amplifier of the second detection module is connected with the fourth resistor and then connected with the isolation unit.
As a preferred embodiment of the present invention, the isolation unit includes an AMC1311 isolation amplifier and an LM358 dual operational amplifier.
As the preferable scheme of the utility model, the VDD end of the AMC1311 isolation amplifier is connected with a power supply; the VIN end of the AMC1311 isolation amplifier is connected with the output end of the second detection module; the SHIDN end of the AMC1311 isolation amplifier is grounded; the OUTP end of the AMC1311 isolation amplifier is sequentially connected with a fifth resistor and the first input end of the LM358 dual operational amplifier; the OUTN end of the AMC1311 isolation amplifier is sequentially connected with a sixth resistor and the second input end of the LM358 dual operational amplifier;
the first input end of the LM358 double-operational amplifier is connected with the seventh resistor and then grounded; and the second input end of the LM358 double-operational amplifier is connected with the eighth resistor and then is connected with the output end of the LM358 double-operational amplifier, and is connected with the sampling assembly through the RC circuit.
As the preferred scheme of the utility model, still include alarm module, alarm module with control circuit is connected. The utility model discloses a set up alarm module, carry out initiative when detecting bad battery and report to the police to the staff can receive the warning the very first time when detecting bad battery, thereby screens the maintenance to bad battery.
As the preferred scheme of the utility model, the sampling subassembly is 16 ADC sampling modules.
As the preferred scheme of the utility model, control circuit is the MCU singlechip.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a control circuit adjustment detects the parameter, can satisfy different types of lithium cell detection protection to and different types of battery cluster uses. Simultaneously the utility model discloses a plurality of detection modules and electronic switch wherein can detect every lithium cell among a plurality of lithium cell groups simultaneously to monitor whole lithium battery system at any time, realize the screening maintenance to bad battery, and the hardware is with low costs, and it is high to detect the precision, is favorable to mass production.
2. The utility model discloses a set up communication module and make the staff can remote control the device detects, and staff's accessible cell-phone (bluetooth) or host computer (communication serial ports) set up the detection parameter and the detection quantity of group battery to make to detect simple and convenient more swift.
3. The utility model discloses a set up alarm module, carry out initiative when detecting bad battery and report to the police to the staff can receive the warning the very first time when detecting bad battery, thereby screens the maintenance to bad battery.
Drawings
Fig. 1 is a schematic structural diagram of a lithium battery pack detection device according to embodiment 1 of the present invention;
fig. 2 is an electrical schematic diagram of an electronic switch in the lithium battery pack detection apparatus according to embodiment 2 of the present invention;
fig. 3 is an electrical schematic diagram of a first detection module in the lithium battery pack detection apparatus according to embodiment 2 of the present invention;
fig. 4 is an electrical schematic diagram of a second detection module in the lithium battery pack detection apparatus according to embodiment 2 of the present invention;
fig. 5 is an electrical schematic diagram of a lithium battery pack detection apparatus according to embodiment 2 of the present invention;
fig. 6 is a schematic voltage sampling diagram of a first detection module in a lithium battery pack detection apparatus according to embodiment 2 of the present invention;
fig. 7 is a schematic signal transmission diagram of a lithium battery pack detection apparatus according to embodiment 2 of the present invention;
fig. 8 is a schematic view of a working flow of the lithium battery pack detection device according to embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, a lithium battery pack detection device includes a control circuit and detection modules, where the detection modules include a first detection module and n second detection modules.
The first detection module comprises an electronic switch, a differential amplifier and a sampling assembly which are sequentially and electrically connected.
The second detection module comprises an electronic switch, an isolation unit, a differential amplifier and a sampling assembly which are electrically connected in sequence; wherein n is a natural number.
The control circuit is used for adjusting the detection parameters of the detection module and is in communication connection with the detection module; the detection parameters include a highest charging voltage and a discharge termination voltage.
The sampling component is a 16-bit ADC sampling module.
The control circuit is an MCU singlechip.
The utility model discloses a voltage value that the sampling subassembly will gather is sent into among the control circuit, the battery voltage actual value that will gather with the detection parameter that control circuit set for compares. If the voltage value is in the set range, the battery is normal, and the control circuit does not process the battery; if the voltage value is not in the set range, the control circuit records that the battery is a bad battery, and closes the charge-discharge loop to protect the battery from over-charge and over-discharge, so that the service life of the battery is prolonged. The staff can monitor whole lithium battery system at any time, to the screening maintenance of bad battery.
Example 2
This embodiment is a circuit implementation of embodiment 1.
As shown in fig. 2, the electronic switches in the first detection module and the second detection module are ADG507 high-speed analog multiplexers, and the S5A terminal of the ADG507 high-speed analog multiplexer of the second detection module is connected to an RC filter circuit.
The differential amplifier is an LM321 operational amplifier. As shown in fig. 3 and 4, the first input terminal of the LM321 operational amplifier is connected to the first resistor and then connected to the DB + port of the ADG507 high-speed analog multiplexer; the second input end of the LM321 operational amplifier is connected with a second resistor and then connected with a DB-port of the ADG507 high-speed analog multiplexer, and the second input end of the LM321 operational amplifier is connected with a third resistor and then connected with the output end of the LM321 operational amplifier; the output end of the LM321 operational amplifier is connected with a fourth resistor, a capacitor and a voltage stabilizing diode in parallel in sequence and then is grounded; the output end of the LM321 operational amplifier of the first detection module is connected with the fourth resistor and then connected with the sampling assembly; and the output end of the LM321 operational amplifier of the second detection module is connected with the fourth resistor and then connected with the isolation unit.
The isolation unit includes an AMC1311 isolation amplifier and an LM358 dual operational amplifier. As shown, the VDD terminal of the AMC1311 isolation amplifier is connected to a power supply; the VIN end of the AMC1311 isolation amplifier is connected with the output end of the second detection module; the SHIDN terminal of the AMC1311 isolation amplifier is grounded; the OUTP end of the AMC1311 isolation amplifier is sequentially connected with a fifth resistor and the first input end of the LM358 dual operational amplifier; the OUTN end of the AMC1311 isolation amplifier is sequentially connected with a sixth resistor and the second input end of the LM358 dual operational amplifier; the first input end of the LM358 double-operational amplifier is connected with the seventh resistor and then grounded; and the second input end of the LM358 double operational amplifier is connected with the eighth resistor and then is connected with the output end of the LM358 double operational amplifier, and is connected with the sampling assembly through the RC circuit. When n is 2, the whole circuit of the device of the present invention is shown in fig. 5.
In this embodiment, as shown in fig. 6 and 7, the ADG507 high-speed analog multiplexer provides 8:1 differential channels, 8 differential voltages can be gated in a unit time, the differential voltages are differentially amplified by the LM321 to obtain voltages of single batteries, and the collected voltages of the single batteries are sampled by the 16-bit ADC and sent to the MCU for processing. If a multiplexer ADG507 and a differential amplifier LM321 are needed to be added for detecting more than 8 strings of batteries, because a battery voltage acquisition circuit higher than 8 strings of batteries and a battery voltage acquisition circuit lower than or equal to 8 strings of batteries are not supplied with ground, battery voltage obtained by difference needs to be isolated by an analog signal isolation amplifier AMC1311 and then sent to a 16-bit ADC for sampling; the design can realize the acquisition of the voltage of the n-string batteries, the batteries are mutually isolated and cannot be interfered by common-mode voltage, the sampling precision is high, the number of used devices is small, the cost is low, and the like.
Example 3
The difference between the present embodiment and the above embodiments is that the above apparatus further includes a communication module and an alarm module.
The communication module is a Bluetooth module or a communication serial port; the alarm module is connected with the control circuit. The control circuit sets detection parameters through mobile phone Bluetooth or is connected with a computer serial port, so that detection protection of different types of lithium batteries can be met; meanwhile, the number of the battery detection strings can be set through the mobile phone Bluetooth or the computer serial port, and the use of different types of battery strings can be met.
At this moment, the signal processing flow of the device is as shown in fig. 8, a worker sets parameters and controls the working state through a bluetooth or a serial port, the single-chip microcomputer MCU is controlled to select a signal channel on the electronic switch, after differential gating and differential amplification, the collected voltage value is sent to the single-chip microcomputer MCU for comparison through 16-bit ADC sampling, when the preset detection parameters are exceeded, an alarm is given, a charging and discharging loop is closed and sent to a mobile phone or an upper computer (such as a PC end) of the worker through the bluetooth or the serial port, and therefore detection of a bad battery is achieved.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The lithium battery pack detection device comprises a control circuit and detection modules, and is characterized in that the detection modules comprise a first detection module and n second detection modules;
the first detection module comprises an electronic switch, a differential amplifier and a sampling assembly which are electrically connected in sequence;
the second detection module comprises an electronic switch, an isolation unit, a differential amplifier and a sampling assembly which are electrically connected in sequence; wherein n is a natural number;
the control circuit is used for adjusting the detection parameters of the detection module and is in communication connection with the detection module; the detection parameters include a maximum charging voltage and a termination discharging voltage.
2. The lithium battery pack detection device according to claim 1, further comprising a communication module, wherein the communication module is a bluetooth module or a communication serial port.
3. The lithium battery pack detection device according to claim 1, wherein the electronic switches of the first detection module and the second detection module are ADG507 high speed analog multiplexers, and the S5A terminal of the ADG507 high speed analog multiplexer of the second detection module is connected to an RC filter circuit.
4. A lithium battery pack detection apparatus according to claim 3, wherein the differential amplifier is an LM321 operational amplifier.
5. The lithium battery pack detection device according to claim 4, wherein a first input terminal of the LM321 operational amplifier is connected to a first resistor and then connected to the DB + port of the ADG507 high-speed analog multiplexer; the second input end of the LM321 operational amplifier is connected with a second resistor and then connected with a DB-port of the ADG507 high-speed analog multiplexer, and the second input end of the LM321 operational amplifier is connected with a third resistor and then connected with the output end of the LM321 operational amplifier; the output end of the LM321 operational amplifier is connected with a fourth resistor, a capacitor and a voltage stabilizing diode in parallel in sequence and then is grounded;
the output end of the LM321 operational amplifier of the first detection module is connected with the fourth resistor and then connected with the sampling assembly; and the output end of the LM321 operational amplifier of the second detection module is connected with the fourth resistor and then connected with the isolation unit.
6. The lithium battery pack detection device according to claim 1, wherein the isolation unit comprises an AMC1311 isolation amplifier and an LM358 dual operational amplifier.
7. The lithium battery pack detection device according to claim 6, wherein the VDD terminal of the AMC1311 isolation amplifier is connected to a power supply; the VIN end of the AMC1311 isolation amplifier is connected with the output end of the second detection module; the SHIDN end of the AMC1311 isolation amplifier is grounded; the OUTP end of the AMC1311 isolation amplifier is sequentially connected with a fifth resistor and the first input end of the LM358 dual operational amplifier; the OUTN end of the AMC1311 isolation amplifier is sequentially connected with a sixth resistor and the second input end of the LM358 dual operational amplifier;
the first input end of the LM358 double-operational amplifier is connected with the seventh resistor and then grounded; and the second input end of the LM358 double operational amplifier is connected with the eighth resistor and then is connected with the output end of the LM358 double operational amplifier, and is connected with the sampling assembly through the RC circuit.
8. The lithium battery pack detection device according to claim 7, further comprising an alarm module, wherein the alarm module is connected to the control circuit.
9. The lithium battery pack detection device according to claim 1, wherein the sampling module is a 16-bit ADC sampling module.
10. The lithium battery pack detection device according to claim 1, wherein the control circuit is an MCU (microprogrammed control Unit) singlechip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220332411.0U CN217305458U (en) | 2022-02-14 | 2022-02-14 | Lithium battery pack detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220332411.0U CN217305458U (en) | 2022-02-14 | 2022-02-14 | Lithium battery pack detection device |
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| Publication Number | Publication Date |
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| CN217305458U true CN217305458U (en) | 2022-08-26 |
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| CN202220332411.0U Active CN217305458U (en) | 2022-02-14 | 2022-02-14 | Lithium battery pack detection device |
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