CN219811999U - BMS system combining lithium battery and super capacitor - Google Patents
BMS system combining lithium battery and super capacitor Download PDFInfo
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- CN219811999U CN219811999U CN202321039257.9U CN202321039257U CN219811999U CN 219811999 U CN219811999 U CN 219811999U CN 202321039257 U CN202321039257 U CN 202321039257U CN 219811999 U CN219811999 U CN 219811999U
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- super capacitor
- lithium battery
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- 239000003990 capacitor Substances 0.000 title claims abstract description 133
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 81
- 238000004891 communication Methods 0.000 claims abstract description 27
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model relates to a BMS system combining a lithium battery and a super capacitor bank, which comprises a lithium battery bank, a super capacitor automatic balancing system, a battery BMS management system, a DC/DC bidirectional converter, a coupler and a microcontroller, wherein the battery BMS management system and the lithium battery bank are connected with the battery BMS management system; the microcontroller is respectively connected with the battery BMS system, the super capacitor automatic balancing system and the coupler; the super capacitor automatic balancing system comprises a super capacitor management system, a communication module, an equalizing circuit, a state acquisition module and the like, and realizes continuous and stable high-power output by utilizing the performance complementation between the lithium battery pack and the super capacitor pack; can meet the normal use requirements of different devices.
Description
Technical Field
The utility model relates to a BMS system, in particular to a BMS system formed by combining a lithium battery and a super capacitor group.
Background
With the development of super-capacitor technology, people pay more and more attention to super-capacitors. Super-capacitors are a high energy density and efficient energy storage device compared to batteries. In most cases, the efficiency of the supercapacitor will be 95% higher than that of a battery operating under full load conditions. The service life of the lithium battery is highly dependent on the charge-discharge period, and the charge-discharge times are limited to 300-500 times. The super capacitor can be charged and discharged for almost infinite times, and the service life of the super capacitor is about 2-3 times of that of the battery. Meanwhile, the charging time of the super capacitor is very short and can be almost negligible compared with that of a lithium battery. Lithium batteries can be shortened in life and even damaged when overdischarged. Lithium batteries have a risk of explosion during overcharge and high-current discharge. In contrast, supercapacitors are safer at high power outputs. Super-capacitors are costly. For the super capacitor and the battery with the same capacity, the cost of the super capacitor is about 10 times of that of the battery. In the discharging process of the super capacitor, the output voltage can be gradually reduced along with the increase of the discharging time.
Disclosure of Invention
The utility model aims to provide a BMS system combining a lithium battery and a super capacitor, which can meet the requirement of instantaneous high-power output and can ensure the stability of output voltage.
The utility model provides a BMS system combining a lithium battery and a super capacitor, which comprises a lithium battery pack, a super capacitor automatic balancing system, a battery BMS management system, a DC/DC bidirectional converter, a coupler and a microcontroller, wherein:
the battery BMS management system, the lithium battery packs, the super capacitor automatic balancing system and the super capacitor packs are the same in number, each lithium battery pack is connected with the corresponding battery BMS management system, each super capacitor pack is connected with the corresponding super capacitor automatic balancing system, the number of the DC/DC bidirectional converters is two, one DC/DC bidirectional converter is connected after all the lithium battery packs are connected in parallel, one end of the other DC/DC bidirectional converter is connected after all the super capacitor packs are connected in parallel, and the other ends of the two DC/DC bidirectional converters are respectively connected with the coupler; the microcontroller is respectively connected with the battery BMS system, the super capacitor automatic balancing system and the coupler;
the super capacitor automatic balancing system comprises a super capacitor management system, a computing unit, a communication module, an equalizing circuit and a first state acquisition module, wherein the output end of the first state acquisition module is connected with the input end of the communication module, the output end of the communication module is connected with the input end of the communication unit, the output end of the communication unit is connected with the input end of the computing unit, and the output end of the computing unit is connected with the input end of the equalizing circuit;
when high-power output is needed, the super capacitor bank can instantly provide high-power energy to meet the demand, and the lithium battery bank can provide proper energy for the super capacitor bank through the coupler to maintain the stable power of the continuous output of the super capacitor bank.
In the utility model, the lithium battery pack is formed by connecting a plurality of lithium batteries in series, and the battery BMS management system is connected with the lithium battery pack and is used for intelligently maintaining each battery unit of the lithium battery pack to prevent the lithium battery pack from being overcharged and overdischarged.
In the utility model, the super capacitor automatic balancing system also comprises an external power supply balancing circuit and an internal power supply balancing circuit, wherein the external power supply balancing circuit is respectively connected with an external power supply, a super capacitor bank and a microcontroller, and the external power supply balancing circuit is powered by the external power supply; the internal power balance circuit is respectively connected with the lithium battery pack, the super capacitor pack and the microcontroller, and is powered by the lithium battery pack.
In the utility model, the super capacitor group is formed by connecting a plurality of super capacitors in series.
In the utility model, an equalizing circuit is arranged between two adjacent super capacitors, and an equalizing circuit is arranged between two adjacent super capacitor groups; the equalizing circuit can realize voltage conversion among different super capacitor groups.
In the utility model, the battery BMS system is formed by connecting a second state acquisition module and a control module, wherein the second state acquisition module is connected with each lithium battery pack.
In the utility model, when the lithium battery pack supplies power to the super capacitor pack through the coupler, the super capacitor automatic balancing system charges and discharges the super capacitor pack and a single super capacitor through the power supply of the lithium battery pack; when the super capacitor bank is not powered by an external power supply, the super capacitor automatic balancing system can perform charge-discharge balancing among the super capacitor banks or perform charge-discharge balancing on a single super capacitor through the super capacitor bank.
In the utility model, the coupler controls the input power of the lithium battery pack to the super capacitor pack and controls the output states of the lithium battery pack and the super capacitor pack.
The battery BMS system and the super capacitor balance system are controlled by the microcontroller to realize secondary distribution, namely, the super capacitor group and the lithium battery group are subjected to secondary power distribution according to the required output power; the first distribution is pre-distribution according to the required output power, and the second distribution is secondary distribution according to the power provided by the super capacitor group and the lithium battery group.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model can realize continuous and stable high-power output by utilizing the performance complementation between the lithium battery pack and the super capacitor pack;
2. according to the utility model, the normal use requirements of different devices can be met only by configuring the corresponding output lines, the lithium battery packs and the super capacitor packs with different capacities;
3. the power adjustment strategy can configure the lithium battery pack with less capacity to realize higher power output;
4. the automatic balancing system for the super capacitor can intelligently balance charge and discharge of different super capacitors in different super capacitor groups and different super capacitors in the same super capacitor group, and does not consume redundant electric quantity.
Drawings
FIG. 1 is a schematic diagram of the coupling of a supercapacitor pack and a lithium battery of the present utility model;
FIG. 2 is a system architecture diagram of the supercapacitor automatic balancing system of the present utility model;
fig. 3 is a schematic structural view of the battery BMS system of the present utility model;
reference numerals in the drawings: 1 is a microcontroller, 2 is a battery BMS system, 3 is a lithium battery pack, 4 is a super capacitor automatic balancing system, 5 is a super capacitor pack, 6 is a super capacitor management system, 7 is a calculation unit, 8 is a communication unit, 9 is a communication module, 10 is an equalization circuit, 11 is a first state acquisition module, 12 is a coupler, 13 is a DC/DC bidirectional converter, 14 is a second state acquisition module, and 15 is a control module.
Description of the embodiments
The foregoing description of the embodiments is provided to facilitate the understanding and use of the utility model by those skilled in the art. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.
Example 1
As shown in fig. 1, the present utility model relates to a BMS system in which a lithium battery and a super capacitor are combined, comprising a lithium battery 3, a super capacitor 5, a super capacitor automatic balancing system 4, a battery BMS management system 2, a coupler 12 connecting the super capacitor and the lithium battery, and a microcontroller 1. Microcontroller 1 adopts CRIT32S406ZK, battery BMS system 2 adopts CR-BMS-BV01, lithium cell group 3 adopts CR-MVC-512100SB, super capacitor automatic balancing system 4 adopts CR-BA-CV01, super capacitor group 5 adopts CR-MVC-512100SC, super capacitor management system adopts CR-BMS-CV01, coupler 12 adopts CR-RFCP750, DC/DC bidirectional converter 13 adopts CRITDC750020. The lithium battery packs 3 are connected with the corresponding battery BMS management system 2 through wires, the super capacitor packs 5 are connected with the corresponding super capacitor automatic balancing system 4 through wires, the lithium battery packs 3 are connected with one end of the corresponding DC/DC bidirectional converter 13 through wires after being connected in parallel, all the super capacitor packs are connected with one end of the other DC/DC bidirectional converter 13 through wires after being connected in parallel, and the other ends of the two DC/DC bidirectional converters are respectively connected with the coupler 12 through wires; the microcontroller 1 is connected with the battery BMS system 2, the super capacitor automatic balancing system 4 and the coupler 12 respectively.
As shown in FIG. 2, the supercapacitor automatic balancing system comprises a supercapacitor management system 4, a calculation unit 7, a communication unit 8, a communication module 9, an equalization circuit 10 and a first state acquisition module 11, wherein the calculation unit 7 adopts CR-CU01, the communication unit 8 adopts CR-COM01S, the communication module 9 adopts CR-COM01SE, the equalization circuit 10 adopts CR-BA-BV01, and the first state acquisition module 11 adopts CR-BMU01S. The output end of the first state acquisition module 11 is connected with the input end of the communication module 9 through a wire, the output end of the communication module 9 is connected with the input end of the communication unit 8 through a wire, the output end of the communication unit 8 is connected with the input end of the calculation unit 7 through a wire, and the output end of the calculation unit 7 is connected with the input end of the equalization circuit 10 through a wire. The calculation unit 7 adopts CR-CU01, the communication unit 8 adopts CR-COM01S, the communication module 9 adopts CR-COM01SE, the equalization circuit 10 adopts CR-BA-BV01, and the first state acquisition module 11 adopts CR-BMU01S.
In the utility model, two couplers 12 respectively connected with the super capacitor group 5 and the lithium battery group 3 have two working states: (1) When external output power is not needed, the lithium battery pack 3 charges the super capacitor pack 5 with the voltage lower than the upper limit range of the voltage threshold through the coupler 12; (2) When external output is needed, the coupler 12 can switch the state of the power supply circuit according to the required power, so that independent power supply of the lithium battery pack 3, independent power supply of the super capacitor pack 5 and combined power supply of the lithium battery pack 3 and the super capacitor pack 5 are realized.
In the utility model, each super capacitor group 5 is connected with a corresponding super capacitor automatic balancing system 4. Further, the system also comprises a super capacitor management system 6, a first state acquisition module 11, an equalization circuit 10 and a communication module 9. The first status collection module 11 is configured to collect information such as temperature and voltage of each supercapacitor and supercapacitor group 5, and status of external power supply, analyze and sort the information, and send the information to the supercapacitor management system 6 through the communication module 9. The equalization circuit 10 includes equalization circuits between individual supercapacitors, and equalization circuits between different groups of supercapacitors. The equalizing circuit can realize voltage conversion among different super capacitor groups. The super capacitor management system comprises a communication unit 8 and a calculation unit 7. The communication unit 8 is responsible for receiving information from the first status collection module 11. The calculating unit 7 is responsible for acquiring information sent by the module 11 according to the first state and judging whether the super capacitor needs to be balanced or not. The DC/DC bidirectional converter 13 works as follows: when the lithium battery pack 3 supplies power, the super capacitor pack 5 below the lower limit range of the voltage threshold can be charged by an external power supply, and meanwhile, each super capacitor can be balanced inside the super capacitor pack 5. And stopping charging when the voltage of the super capacitor group 5 reaches the upper limit range of the voltage threshold. When no lithium battery pack 3 is supplied, the super capacitor pack 5 below the lower voltage threshold range is charged by the other super capacitor packs 5 in the normal voltage threshold range until the voltage of the charged super capacitor pack reaches the normal voltage threshold range.
As shown in fig. 3, the battery BMS system 2 includes a second state collection module 14 and a control module 15, and the second state collection module 14 is used for collecting information of the electric quantity, temperature, etc. of each lithium battery and the lithium battery pack 3, and information of external power supply. If the lithium battery pack 3 needs to charge the external output power or the super capacitor, but a certain lithium battery pack 3 does not have enough electric quantity, the battery BMS system 2 can switch to other lithium battery packs to supply power through the control module 15, so that overdischarge of the lithium battery packs is prevented. If the charge of a certain lithium battery pack is maintained at a sufficient charge for a certain period of time, the battery BMS system 2 disconnects the external power supply from the lithium battery pack, preventing the overcharge of the lithium battery pack.
The microcontroller 1 is respectively connected with the battery BMS system 2 and the super capacitor automatic balancing system 4 through a data bus. The microcontroller 1 can read information such as the electric quantity, the temperature and the like of the lithium battery pack 3 from the battery BMS system 2, and information such as the temperature, the voltage and the like of the super capacitor pack 5 from the super capacitor automatic balancing system 4. The microcontroller 1 can communicate with external devices wirelessly to obtain power required by the external devices, and can set the power output of the BMS system by people. Based on the battery BMS system 2, the supercapacitor automatic balancing system 4, and the information required to be output, the microcontroller 1 performs power distribution on the supercapacitor pack and the lithium battery pack twice according to the required output power. The first allocation is pre-allocation based on the required output power. The second distribution is performed according to the power provided by the super capacitor group and the lithium battery group, so that the output efficient configuration is realized.
Claims (9)
1. The utility model provides a BMS system of lithium cell and super capacitor combination, includes lithium cell group, super capacitor automatic balance system, battery BMS management system, DC/DC bidirectional transducer, coupler and microcontroller, its characterized in that:
the battery BMS management system, the lithium battery packs, the super capacitor automatic balancing system and the super capacitor packs are the same in number, each lithium battery pack is connected with the corresponding battery BMS management system, each super capacitor pack is connected with the corresponding super capacitor automatic balancing system, the number of the DC/DC bidirectional converters is two, one DC/DC bidirectional converter is connected after all the lithium battery packs are connected in parallel, one end of the other DC/DC bidirectional converter is connected after all the super capacitor packs are connected in parallel, and the other ends of the two DC/DC bidirectional converters are respectively connected with the coupler; the microcontroller is respectively connected with the battery BMS system, the super capacitor automatic balancing system and the coupler;
the super capacitor automatic balancing system comprises a super capacitor management system, a computing unit, a communication module, an equalizing circuit and a first state acquisition module, wherein the output end of the first state acquisition module is connected with the input end of the communication module, the output end of the communication module is connected with the input end of the communication unit, the output end of the communication unit is connected with the input end of the computing unit, and the output end of the computing unit is connected with the input end of the equalizing circuit;
when high-power output is needed, the super capacitor bank can instantly provide high-power energy to meet the demand, and the lithium battery bank can provide proper energy for the super capacitor bank through the coupler to maintain the stable power of the continuous output of the super capacitor bank.
2. The BMS system of claim 1 wherein the BMS system comprises: the lithium battery pack is formed by connecting a plurality of lithium batteries in series, and the battery BMS management system is connected with the lithium battery pack and is used for intelligently maintaining each battery unit of the lithium battery pack and preventing the lithium battery pack from being overcharged and overdischarged.
3. The BMS system of claim 1 wherein the BMS system comprises: the super capacitor automatic balancing system further comprises an external power supply balancing circuit and an internal power supply balancing circuit, wherein the external power supply balancing circuit is respectively connected with an external power supply, the super capacitor bank and the microcontroller, and the external power supply balancing circuit is powered by the external power supply; the internal power balance circuit is respectively connected with the lithium battery pack, the super capacitor pack and the microcontroller, and is powered by the lithium battery pack.
4. The BMS system of claim 1 wherein the BMS system comprises: the super capacitor group is formed by connecting a plurality of super capacitors in series.
5. The BMS system of claim 1 wherein the BMS system comprises: an equalizing circuit is arranged between two adjacent super capacitors, and an equalizing circuit is arranged between two adjacent super capacitor groups; the equalizing circuit can realize voltage conversion among different super capacitor groups.
6. The BMS system of claim 1 wherein the BMS system comprises: the battery BMS system is formed by connecting a second state acquisition module and a control module, and the second state acquisition module is connected with each lithium battery pack.
7. The BMS system of claim 1 wherein the BMS system comprises: when the lithium battery pack supplies power to the super capacitor pack through the coupler, the super capacitor automatic balancing system charges and discharges the super capacitor pack and a single super capacitor through the power supply of the lithium battery pack; when the super capacitor bank is not powered by an external power supply, the super capacitor automatic balancing system can perform charge-discharge balancing among the super capacitor banks or perform charge-discharge balancing on a single super capacitor through the super capacitor bank.
8. The BMS system of claim 1 wherein the BMS system comprises: the coupler controls the input power of the lithium battery pack to the super capacitor pack and controls the output states of the lithium battery pack and the super capacitor pack.
9. The BMS system of claim 1 wherein the BMS system comprises: the microcontroller controls the battery BMS system and the super capacitor balance system to realize secondary distribution, namely, the super capacitor group and the lithium battery group are subjected to secondary power distribution according to the required output power; the first distribution is pre-distribution according to the required output power, and the second distribution is secondary distribution according to the power provided by the super capacitor group and the lithium battery group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321039257.9U CN219811999U (en) | 2023-05-05 | 2023-05-05 | BMS system combining lithium battery and super capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321039257.9U CN219811999U (en) | 2023-05-05 | 2023-05-05 | BMS system combining lithium battery and super capacitor |
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| Publication Number | Publication Date |
|---|---|
| CN219811999U true CN219811999U (en) | 2023-10-10 |
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| CN202321039257.9U Active CN219811999U (en) | 2023-05-05 | 2023-05-05 | BMS system combining lithium battery and super capacitor |
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- 2023-05-05 CN CN202321039257.9U patent/CN219811999U/en active Active
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