CN218633407U - Device for balancing voltage among energy storage lithium battery clusters - Google Patents
Device for balancing voltage among energy storage lithium battery clusters Download PDFInfo
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- CN218633407U CN218633407U CN202223080024.1U CN202223080024U CN218633407U CN 218633407 U CN218633407 U CN 218633407U CN 202223080024 U CN202223080024 U CN 202223080024U CN 218633407 U CN218633407 U CN 218633407U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a device for carry out the equilibrium to voltage between energy storage lithium battery cluster, including lithium battery cluster, battery Management System (BMS), battery Management Unit (BMU) and two-way DC-AC converter of isolated form, lithium battery cluster includes the lithium battery unit of a plurality of series connections, and every lithium battery unit contains 1 lithium ion battery monomer at least; the Battery Management Unit (BMU) is electrically connected with the lithium battery cluster and is responsible for collecting and managing the voltage data of the single battery cell in the battery cluster; the Battery Management System (BMS) is connected between the Battery Management Unit (BMU) and the isolated bidirectional DC-AC converter and is responsible for acquiring voltage data of the Battery Management Unit (BMU) and sending an instruction to a relay of the isolated bidirectional DC-AC according to the voltage information; the isolated bidirectional DC-AC converter is responsible for active energy balance among lithium battery clusters with voltage difference. This novel voltage that has realized between the energy storage lithium cell cluster carries out the equilibrium, extension energy storage group battery life.
Description
Technical Field
The utility model relates to a power battery technical field specifically is a device that is used for carrying out the equilibrium to voltage between energy storage lithium cell cluster.
Background
The lithium battery cluster generally comprises 3 to 16 lithium battery monomers, the voltage balance and protection of the lithium battery monomers are borne by a BMU protection board, the higher the voltage of the current energy storage system is (more than 800 volts is achieved), a plurality of lithium battery clusters are required to be connected in series for use, the plurality of lithium battery cluster monomers in the system need to be strictly screened, and otherwise, the unbalanced voltage among the lithium battery clusters in the initial stage can bring great potential safety hazards to the long-term operation of the system. In order to actively enable the voltage between the lithium battery clusters to be in a balanced state all the time, and enable the lithium battery monomers of different batches to be mixed without fine selection, thereby avoiding a large amount of work and ensuring the reliable operation of a system, a device for balancing the voltage between the lithium battery clusters must be provided.
SUMMERY OF THE UTILITY MODEL
The problem that exists to current technical scheme. An object of the utility model is to provide a device for being directed at energy storage lithium cell carries out the equilibrium between the cluster voltage.
In order to achieve the above object, the utility model provides a following technical scheme:
the device for balancing the voltage among the energy storage lithium battery clusters comprises the lithium battery clusters, a Battery Management System (BMS), a Battery Management Unit (BMU) and an isolated bidirectional DC-AC converter, and is characterized in that the lithium battery clusters are energy storage units and comprise a plurality of lithium battery units which are connected in series, and each lithium battery unit comprises at least 1 lithium ion battery monomer;
the Battery Management Unit (BMU) is electrically connected with the lithium battery cluster and is responsible for collecting and managing the voltage data of the single battery cell in the battery cluster;
the Battery Management System (BMS) is connected between the Battery Management Unit (BMU) and the isolated bidirectional DC-AC converter and is responsible for acquiring voltage data of the Battery Management Unit (BMU) and sending an instruction to a relay of the isolated bidirectional DC-AC according to the voltage information;
the isolated bidirectional DC-AC converter is responsible for active energy balance among the lithium battery clusters with voltage difference.
Further, the isolated bidirectional DC-AC converter comprises a relay 1, an inverter, a relay 2, a transformer and a balanced AC bus; a normally open contact of the relay 1 is connected with the negative electrode of the lithium battery cluster, and a public end is connected with the negative electrode of the inverter input; the normally open contact of the relay 2 is connected with one pin of the secondary side of the transformer, and the normally closed contact is connected with the adjacent pin of the secondary side.
Furthermore, the Battery Management Unit (BMU) includes a plurality of sub-voltage monitoring circuits, the number of the sub-voltage monitoring circuits is the same as the number of the lithium battery cells, and the sub-voltage monitoring circuits are connected to the lithium battery cells in a one-to-one mapping manner, and are configured to monitor voltage information of each lithium battery cell in real time.
Compared with the prior art, the beneficial effects of the utility model are that: this novel can initiatively make the voltage between the lithium cell cluster be in balanced state all the time to can make the lithium cell monomer of different batches use thoughtlessly, need not carefully choose, not only avoid a large amount of works, bigger assurance the reliable operation of system moreover.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
FIG. 1 is a schematic connection diagram of a voltage balancing device between lithium battery clusters according to the present invention;
figure 2 is the utility model discloses a plurality of lithium cell cluster series system connection diagrams.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1-2, the present embodiment provides an apparatus for equalizing voltages among energy storage lithium battery clusters, which includes a lithium battery cluster, a Battery Management System (BMS), a Battery Management Unit (BMU), and an isolated bidirectional DC-AC converter, where the lithium battery cluster is an energy storage unit, and includes a plurality of lithium battery cells connected in series, and each lithium battery cell includes at least 1 lithium ion battery cell;
the Battery Management Unit (BMU) is electrically connected with the lithium battery cluster and is responsible for collecting and managing the voltage data of the single battery cell in the battery cluster;
the Battery Management System (BMS) is connected between the Battery Management Unit (BMU) and the isolated bidirectional DC-AC converter and is responsible for acquiring voltage data of the Battery Management Unit (BMU) and sending an instruction to a relay of the isolated bidirectional DC-AC according to the voltage information;
the isolated bidirectional DC-AC converter is responsible for active energy balance among lithium battery clusters with voltage difference.
Referring to fig. 1, the isolated bidirectional DC-AC converter includes a relay 1, an inverter, a relay 2, a transformer, and a balanced AC bus; a normally open contact of the relay 1 is connected with the negative electrode of the lithium battery cluster, and a public end is connected with the negative electrode of the inverter input; the normally open contact of the relay 2 is connected with one pin of the secondary side of the transformer, and the normally closed contact is connected with the adjacent pin of the secondary side.
The Battery Management Unit (BMU) comprises a plurality of sub-voltage monitoring circuits, the number of the sub-voltage monitoring circuits is the same as that of the lithium battery cells, and the sub-voltage monitoring circuits are connected with the lithium battery cells in a one-to-one mapping mode and used for monitoring the voltage information of each lithium battery cell in real time.
The specific equalization process is as follows: after a Battery Management System (BMS) detects the voltages of all lithium battery clusters, the lithium battery cluster x with the highest voltage and the lithium battery cluster y with the lowest voltage are selected, then a relay 2 of a bidirectional DC-AC converter corresponding to the lithium battery cluster y with the lowest voltage is closed, the number of turns of the secondary side of the transformer is reduced, so that the pressure difference between the two lithium battery clusters is increased to improve the balance power, then a relay 1 of the bidirectional DC-AC converter corresponding to the lithium battery cluster x and a relay 1 of the bidirectional DC-AC converter corresponding to the lithium battery cluster y are closed, and the bidirectional DC-AC converter starts the balance work. And when the Battery Management System (BMS) detects that the voltage difference between the lithium battery cluster x and the lithium battery cluster y is less than 50mV, all the closed relays are disconnected, and the balancing is stopped. And then, the Battery Management System (BMS) reorders the voltages of all the lithium battery clusters, the lithium battery cluster i with the highest voltage and the lithium battery cluster j with the lowest voltage are selected again, the Battery Management System (BMS) repeats the balancing instruction, and the balancing is finished until the voltage difference between all the lithium battery clusters is less than 50 mV.
This novel realization initiative makes the voltage between the lithium cell cluster be in balanced state all the time to can make the lithium cell monomer of different batches use together, need not carefully choose, not only avoid a large amount of work, bigger assurance the reliable operation of system moreover.
The foregoing is merely illustrative of the structure of the invention and various modifications, additions or substitutions in similar manner to the specific embodiments described herein may be made by those skilled in the art without departing from the structure or scope of the invention as defined in the accompanying claims.
Claims (3)
1. The device for balancing the voltage among the energy storage lithium battery clusters comprises the lithium battery clusters, a Battery Management System (BMS), a Battery Management Unit (BMU) and an isolated bidirectional DC-AC converter, and is characterized in that the lithium battery clusters are energy storage units and comprise a plurality of lithium battery units connected in series, and each lithium battery unit comprises at least 1 lithium ion battery monomer;
the Battery Management Unit (BMU) is electrically connected with the lithium battery cluster and is responsible for collecting and managing the voltage data of the single battery cell in the battery cluster;
the Battery Management System (BMS) is connected between the Battery Management Unit (BMU) and the isolated bidirectional DC-AC converter and is responsible for acquiring voltage data of the Battery Management Unit (BMU) and sending an instruction to a relay of the isolated bidirectional DC-AC according to the voltage information;
the isolated bidirectional DC-AC converter is responsible for active energy balance among lithium battery clusters with voltage difference.
2. The apparatus according to claim 1, wherein the isolated bidirectional DC-AC converter comprises a relay 1, an inverter, a relay 2, a transformer, and a balancing AC bus; a normally open contact of the relay 1 is connected with the negative electrode of the lithium battery cluster, and a public end is connected with the negative electrode of the inverter input; the normally open contact of the relay 2 is connected with one leg of the secondary side of the transformer, and the normally closed contact is connected with the adjacent leg of the secondary side.
3. The apparatus according to claim 1, wherein the Battery Management Unit (BMU) comprises a plurality of sub-voltage monitoring circuits, the number of the sub-voltage monitoring circuits is the same as that of the lithium battery cells, and the sub-voltage monitoring circuits are connected with the lithium battery cells in a one-to-one mapping manner for monitoring the voltage information of each lithium battery cell in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223080024.1U CN218633407U (en) | 2022-11-21 | 2022-11-21 | Device for balancing voltage among energy storage lithium battery clusters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223080024.1U CN218633407U (en) | 2022-11-21 | 2022-11-21 | Device for balancing voltage among energy storage lithium battery clusters |
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| Publication Number | Publication Date |
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| CN218633407U true CN218633407U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223080024.1U Active CN218633407U (en) | 2022-11-21 | 2022-11-21 | Device for balancing voltage among energy storage lithium battery clusters |
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| CN (1) | CN218633407U (en) |
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- 2022-11-21 CN CN202223080024.1U patent/CN218633407U/en active Active
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