CN211720294U - Protection circuit for gradient utilization of retired power battery module - Google Patents
Protection circuit for gradient utilization of retired power battery module Download PDFInfo
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- CN211720294U CN211720294U CN202020510232.2U CN202020510232U CN211720294U CN 211720294 U CN211720294 U CN 211720294U CN 202020510232 U CN202020510232 U CN 202020510232U CN 211720294 U CN211720294 U CN 211720294U
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Abstract
The utility model discloses a protection circuit for retired power battery module echelon utilizes, protection circuit includes major control system, sampling circuit and is used for sending into major control system after sampling through sampling circuit sampling respectively according to the switch circuit that major control system signal control battery module charge-discharge turn-offs, voltage signal line, the temperature signal line of retired power battery module, major control system comes control switch circuit according to predetermined reference temperature, charge-discharge voltage. The utility model has the advantages that: the circuit structure is simple and convenient to realize; the power consumption is low, and the method is more suitable for the gradient utilization of the retired lithium battery; the cost is low, the popularization is convenient, and the cost of echelon utilization is saved; the protection of overvoltage, overcurrent, high temperature and the like of the power battery module utilizing in the echelon can be realized, and the protection is safe and reliable.
Description
Technical Field
The utility model relates to a battery management field, in particular to a protection circuit for retired power battery module echelon utilizes.
Background
When the power battery for the new energy electric vehicle is used for a certain time or is circulated for a certain number of times, the capacity or power characteristic of the power battery is obviously declined, the requirement for the vehicle cannot be met, and the power battery needs to be retired from the vehicle. However, the retired power battery still has great residual value, and the capacity and power of the retired power battery can still meet the requirements of other energy storage occasions with low power requirements, so that the retired power battery can be utilized in a gradient manner. In the process of conducting echelon utilization on the retired power battery, the original automobile BMS battery management system is not suitable for echelon utilization of the retired power battery due to the reasons that a CAN address is lost and the reconstruction cost is too high caused by battery pack splitting, and therefore an effective and cost-saving protection measure is needed to be considered for solving the safety problem of echelon utilization of the retired power battery.
The unused power battery is verified during the service period and the alleviation of the use environment during the echelon utilization after the retirement is considered, and the main reason that the retired power battery generates the safety problem during the echelon utilization is focused on the charging and discharging link. When the retired power battery is used in a echelon mode, even though thousands of batteries are not used in an automobile, tens of batteries or hundreds of batteries are generally used, certain difference exists between every two batteries due to the restriction of production technology and production materials, and the difference between the retired batteries is more obvious. In the process of charging and discharging, if protection and restriction are not applied, the conditions of over-high voltage, over-low voltage, over-high current, over-high temperature, imbalance and the like of the battery can be easily caused, so that the service cycle is reduced, the performance is reduced, and explosion and fire can be caused under severe conditions. Therefore, the safety protection problem of the retired power battery in the charging and discharging process is the first threshold for the retired power battery to perform gradient utilization.
For the protection of new power batteries, various companies at home and abroad develop different types of lithium ion battery protection chips, and the development is mature. Compared with the protection of new batteries, the charge and discharge protection of the retired power lithium battery at home and abroad is the same as the gradient utilization of the retired power battery, and the retired power lithium battery is in a starting stage. There is a gap in existing protection in the face of more complex battery inconsistencies and lower power requirements.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a protection circuit for the echelon utilization of a retired power battery module, which is used for realizing the safety protection during the echelon recycling of a power battery.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a protection circuit for retired power battery module echelon utilizes, protection circuit includes major control system, sampling circuit and is used for controlling the switch circuit that battery module charge-discharge was shut off according to the major control system signal, and the major control system is sent into after sampling through the sampling circuit respectively to voltage signal line, the temperature signal line of retired power battery module, major control system controls switch circuit according to predetermined benchmark temperature, charge-discharge voltage.
The switch circuit comprises an MOS tube circuit which is used for switching on and off according to a control signal of the master control system.
The MOS tube circuit comprises a charge control MOS tube and a discharge control MOS tube and is used for respectively controlling charge shutoff and discharge shutoff.
The protection circuit further comprises a current acquisition circuit, and the output end of the current acquisition circuit is sent to the master control system after passing through the sampling circuit.
The master control system comprises a master control chip, a comparison module and a voltage reference circuit, wherein the voltage reference circuit is used for generating a reference circuit, the input end of the comparison module is connected with the sampling module and used for comparing the acquired signal with the reference signal and then outputting the signal to the input end of the master control chip, and the output end of the master control chip is connected to the grid electrode of the MOS tube circuit and used for controlling the on-off of the MOS tube circuit.
The main control chip is connected with the timing chip and used for timing.
The utility model has the advantages that: the circuit structure is simple and convenient to realize; the power consumption is low, and the method is more suitable for the gradient utilization of the retired lithium battery; the cost is low, the popularization is convenient, and the cost of echelon utilization is saved; the power battery module protection device has the advantages that overvoltage, overcurrent, high temperature and the like of the power battery module for echelon utilization can be protected, safety and reliability are realized, and the development of echelon utilization of the power battery can be promoted.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a block diagram of the protective circuit of the present invention;
FIG. 2 is a schematic diagram of the signal connections of the present invention;
fig. 3 is a circuit diagram of an embodiment of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
The application provides a protection circuit for echelon utilization of a retired power battery module, which is used for protecting a power battery for echelon utilization and comprises a master control system, a sampling circuit and a switch circuit, wherein the switch circuit is used for controlling the charging and discharging of the battery module to be turned off according to signals of the master control system; the voltage signal line and the temperature signal line of the retired power battery module are respectively sampled by the sampling circuit and then sent to the master control system (a plurality of AD (analog-to-digital) modules are arranged to realize respective sampling and respectively sent to the master control system), and the sampling circuit comprises an AD sampling chip and is used for sampling analog signals sent by the signal line into digital signals to be sent to the master control system for processing. And the master control system controls the switch circuit according to the comparison of preset reference temperature, charge-discharge voltage and the temperature and voltage data obtained by sampling.
The main control system is used for controlling the switch circuit to be switched off to stop charging or discharging after judging whether the charging and discharging voltage and the temperature are larger than the set threshold value. The main control system comprises a main control chip, a voltage reference circuit and a comparison module, wherein the main control chip is used for realizing control over a switch circuit and control output after voltage comparison and temperature comparison, each battery module generally corresponds to one voltage reference circuit and one comparison module respectively, after voltage, temperature and the like are input into a knife comparison circuit, comparison output can be realized with the reference circuit to the main control chip, then control over the switch circuit is realized according to a comparison result, the comparison circuit can be realized by adopting components such as a comparator, actually, a plurality of chips are integrated with the comparator circuit, the comparison function of the application can be realized in a software or hardware integration mode in the plurality of main control chips, and the main control system comprises a 51-series single chip microcomputer, a Siemens S700-series PLC and the like.
The switch circuit comprises an MOS tube circuit which is used for switching on and off according to a control signal of the master control system. The MOS tube circuit comprises a charge control MOS tube and a discharge control MOS tube and is used for respectively controlling charge shutoff and discharge shutoff.
The protection circuit also comprises a current acquisition circuit, and the output end of the current acquisition circuit is sent to the master control system after passing through the sampling circuit. The master control system comprises a master control chip, a comparison module and a voltage reference circuit, wherein the voltage reference circuit is used for generating a reference circuit, the input end of the comparison module is connected with the sampling module and used for comparing the acquired signal with the reference signal and then outputting the signal to the input end of the master control chip, and the output end of the master control chip is connected to the grid electrode of the MOS tube circuit and used for controlling the on-off of the MOS tube circuit. The main control chip is connected with the timing chip and used for timing, and when the duration time of overvoltage, overcurrent and overtemperature reaches a set time threshold value, a signal is output to the MOS tube to disconnect charging. The following is explained in detail with reference to the drawings:
as shown in figure 1, the design idea of the retired power battery module protection circuit is that the vehicle power battery system is composed of a battery core, a battery module and a battery pack. Only need when the decommissioning is disassembled to carry out the one-level to the battery package and disassemble the module promptly by the battery package, then screen the energy storage part that utilizes as the echelon to the module, have signal wire harness on every module certainly, with signal transmission to protection chip on this pencil, then the chip gives control signal transmission through the comparison and gives the control MOS pipe, thereby through the shutoff of the shutoff control charge-discharge of MOS pipe, with the safety problem that solves the decommissioning power battery and utilize the in-process at the echelon. The protection circuit mainly comprises three large acquisition, comparison and control links, and a block diagram of modules is shown in figure 1.
The application has utilized the signal line of power battery module to 5 battery modules as an example, as shown in fig. 2, 3, for 3 of this application protection circuit and signal harness connection diagram and concrete realization schematic diagram, wherein master control chip U1's model is: BM3451 UNDC-T28A; the wiring relation can be completed by referring to fig. 2, as shown in fig. 3, when the power battery is recycled in a echelon, the protection principle is as follows:
overcharge protection: when the battery is charged and the voltage of the VIN pin is lower than the charging overcurrent protection threshold value, namely no charging overcurrent occurs, as long as any voltage value of Vb1, (Vb2-Vb1), (Vb3-Vb2), (Vb4-Vb3) and (Vb + -Vb4) is higher than the overcharge protection threshold value and lasts for a period of overcharge protection delay, the CO end is pulled to the low level from the high level, the charging control MOS tube is turned off, and charging is stopped.
Over-discharge protection: when the battery is discharged and the voltage of the VIN pin is lower than the discharge overcurrent protection threshold value, namely no discharge overcurrent occurs, as long as any voltage value of Vb1, (Vb2-Vb1), (Vb3-Vb2), (Vb4-Vb3) and (Vb + -Vb4) is lower than the overdischarge protection threshold value and lasts for a period of overdischarge protection time delay, the DO end is changed from high level to low level, the charge-discharge control MOS tube is turned off, and the discharge is stopped.
Discharge overcurrent: during discharge, the VIN pin voltage increases with increasing discharge current. When the voltage of the VIN pin is higher than the overcurrent protection threshold value and lasts for a period of time of discharge overcurrent protection delay, namely, the overcurrent is considered to occur, the DO is changed from a high level to a low level, the discharge control MOS tube is turned off to stop discharging, and meanwhile, the pull-down resistor in the VM end of the overcurrent locking terminal is connected. At this point, the lock can be released by disconnecting the load.
Temperature protection: the temperature signal is directly transmitted to the protection board through a signal wire by a temperature sensor carried by the module, when the charging temperature is higher than the protection temperature, CO is pulled down to a low level by an external resistor, the charging control MOS tube is turned off to stop charging, when the temperature of the battery cell is lower than the charging protection temperature by 5 ℃ (the set charging over-temperature protection hysteresis temperature), CO is changed into a high level, and the charging control MOS is turned on again; when the discharge temperature is higher than the protection temperature, DO becomes low level, the discharge MOS tube is turned off to stop discharging, the charge MOS tube is also turned off to prohibit charging, when the cell temperature is lower than the discharge protection temperature by 15 ℃ (the set discharge over-temperature protection hysteresis temperature), DO becomes high level, CO becomes high level, and the charge and discharge control MOS is turned on again.
The present application differs from the prior art in that: the existing protection technology is mainly directed to a power battery in service on a new energy automobile and a power battery in other scenes with low power performance requirements, the new energy automobile is provided with a matched automobile BMS battery management system, the power battery in other scenes with low power performance requirements is provided with a corresponding protection circuit, and the power battery management system and the power battery protection circuit have the following defects when the power battery module in service from the new energy automobile is utilized in a gradient manner:
(1) high cost
The automobile BMS battery management system intelligently manages and maintains each battery unit through a CAN bus, and the retired power battery pack CAN cause the loss of a CAN address of the battery when being detached, so that the remanufacturing cost is too high, and the battery management system is not suitable for the echelon utilization of the retired power battery module; the protection circuit used by the power battery in other scenes with low power performance requirements is basically formed by building a peripheral circuit around a protection chip, a corresponding acquisition circuit is required to acquire signals and transmit the signals to the chip for comparison and calculation, and the cost is increased due to excessive building of the circuit under the multifunctional requirement; the invention still adopts a method of building a corresponding protection circuit around the protection IC, but a signal wire harness carried by a retired power battery module is used when the circuit is built, and the corresponding voltage and temperature signals of each battery are directly transmitted to a chip, so that the existing resources are fully utilized to reduce the overall cost of the circuit;
(2) high power consumption
The original protection technology has higher power consumption due to the complexity of a protection structure and a circuit, and the invention directly transmits the corresponding voltage and temperature signals of each battery to the chip by utilizing the signal wire harness carried by the retired power battery module, thereby reducing part of power consumption and saving energy resources; (3) low current
The automobile BMS battery management system does not consider being used for the echelon utilization of the retired power battery module because of overhigh reconstruction cost and complex technology; although the cost of a protection circuit used by the power battery in other scenes with low power performance requirements is reduced, the protection circuit is basically applied to a low-current scene and cannot meet the requirement of large current during the gradient utilization of the retired power battery module.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (6)
1. The utility model provides a protection circuit for retired power battery module echelon utilization which characterized in that: the protection circuit comprises a master control system, a sampling circuit and a switch circuit, wherein the switch circuit is used for controlling the charging and discharging of the battery module according to signals of the master control system, a voltage signal line and a temperature signal line of the retired power battery module are respectively sampled by the sampling circuit and then sent into the master control system, and the master control system controls the switch circuit according to preset reference temperature and charging and discharging voltages.
2. The protection circuit for echelon utilization of decommissioned power battery modules according to claim 1, wherein: the switch circuit comprises an MOS tube circuit which is used for switching on and off according to a control signal of the master control system.
3. The protection circuit for echelon utilization of the retired power battery module according to claim 2, wherein: the MOS tube circuit comprises a charge control MOS tube and a discharge control MOS tube and is used for respectively controlling charge shutoff and discharge shutoff.
4. The protection circuit for echelon utilization of decommissioned power battery modules according to claim 1, wherein: the protection circuit further comprises a current acquisition circuit, and the output end of the current acquisition circuit is sent to the master control system after passing through the sampling circuit.
5. The protection circuit for echelon utilization of decommissioned power battery modules according to claim 1, wherein: the master control system comprises a master control chip, a comparison module and a voltage reference circuit, wherein the voltage reference circuit is used for generating a reference circuit, the input end of the comparison module is connected with the sampling module and used for comparing the acquired signal with the reference signal and then outputting the signal to the input end of the master control chip, and the output end of the master control chip is connected to the grid electrode of the MOS tube circuit and used for controlling the on-off of the MOS tube circuit.
6. The protection circuit for echelon utilization of decommissioned power battery modules according to claim 5, wherein: the main control chip is connected with the timing chip and used for timing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020510232.2U CN211720294U (en) | 2020-04-09 | 2020-04-09 | Protection circuit for gradient utilization of retired power battery module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020510232.2U CN211720294U (en) | 2020-04-09 | 2020-04-09 | Protection circuit for gradient utilization of retired power battery module |
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| CN211720294U true CN211720294U (en) | 2020-10-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115622193A (en) * | 2022-11-03 | 2023-01-17 | 广州云通锂电池股份有限公司 | Protection circuit of rechargeable battery |
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- 2020-04-09 CN CN202020510232.2U patent/CN211720294U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115622193A (en) * | 2022-11-03 | 2023-01-17 | 广州云通锂电池股份有限公司 | Protection circuit of rechargeable battery |
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Effective date of registration: 20211123 Address after: 241000 rooms A206 and 207, complex building, 38 Yinhu North Road, Wuhu District, China (Anhui) pilot Free Trade Zone, Wuhu City, Anhui Province Patentee after: WUHU WANJIANG INTELLECTUAL PROPERTY OPERATION CENTER Co.,Ltd. Address before: 241000 Anhui Wuhu economic and Technological Development Zone, Changchun Road, No. 8 generator transformer joint factory Patentee before: ANHUI RUISAIKE RENEWABLE RESOURCE TECHNOLOGY Co.,Ltd. |
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