CN215451508U - Battery pack capable of keeping running after automatic disconnection of partial fault battery units - Google Patents
Battery pack capable of keeping running after automatic disconnection of partial fault battery units Download PDFInfo
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- CN215451508U CN215451508U CN202121167647.5U CN202121167647U CN215451508U CN 215451508 U CN215451508 U CN 215451508U CN 202121167647 U CN202121167647 U CN 202121167647U CN 215451508 U CN215451508 U CN 215451508U
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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
Abstract
A battery pack that remains operational after automatically disengaging partially failed battery cells, comprising: the battery management system BMS is connected with the series units in series, and each series unit is connected with the battery management system BMS; the negative end of the previous series unit 7 is connected with the positive end of the next series unit, the positive end of the uppermost series unit is the positive electrode of the battery pack, and the negative end of the lowermost series unit is the negative electrode of the battery pack; the bypass switch driving circuit DRV and the battery parameter monitoring circuit SEN of each series unit (7) are respectively connected to the battery management system BMS, when the battery parameter monitoring circuit SEN detects that a battery unit 9 in a certain series unit 7 works abnormally, the bypass switch K of the series unit 7 is switched to be in a closed state, the battery unit with the fault in the series unit is automatically disconnected from the system, the system current path is switched to the bypass switch K of the series unit 7, and the battery pack can keep running continuously.
Description
Technical Field
The utility model belongs to the field of new energy batteries, and particularly relates to a battery pack capable of keeping running after a part of fault battery units are automatically disconnected.
Background
At present, lithium ion batteries are widely applied to the fields of electric automobiles and the like.
The system voltage required in the field of electric vehicles and the like is usually as high as hundreds of volts, and the rated voltage of lithium ion battery cells is generally below 5V, so that a battery pack is formed by connecting a large number of battery cells in series and increasing the voltage. For example, 100 lithium iron phosphate batteries with a rated voltage of 3.2V are connected in series to form a battery pack with a rated voltage of 320V.
If the electric capacity (Ah) of the battery monomer can not meet the design requirement of the battery pack, a plurality of battery monomers need to be connected in parallel to form a parallel block with larger capacity, and the parallel block is connected in series on the basis. For example, 100 18650 single batteries with rated capacitance of 3Ah are connected in parallel to form a parallel block with capacity of 300Ah, and 100 parallel blocks are connected in series to form a battery pack with 320V/300A (96 kWh).
In a circuit structure in which battery cells or parallel blocks are connected in series to form a battery pack, if one or more series battery cells or battery cell parallel block units fail, the general method is to disconnect the electrical connection between the entire battery pack and an external circuit, so that the entire system cannot continue to operate.
There is a need for a battery pack that automatically disconnects a partially failed battery unit and then remains operational, such that when a failure occurs in a portion of the battery units that comprise the battery pack, the system can remain operational and strive for continued operation of the powered device prior to servicing, such as continued travel of the electric vehicle to a service station.
Disclosure of Invention
The utility model aims to provide a battery pack capable of keeping running after a part of faulty battery units are automatically disconnected, which can overcome the defect that the whole system cannot continue running after the existing battery units are faulty, and can still keep running when a part of battery units forming the battery pack are faulty, thereby striving for continuous running time before maintenance of electric equipment and avoiding sudden shutdown of the system or unsafe accidents caused by the sudden shutdown of the system.
The technical scheme for realizing the purpose of the utility model is as follows: a battery pack which keeps running after a part of failed battery units are automatically disconnected comprises a battery management system BMS and a plurality of series units, wherein the series units are connected in series, and each series unit is connected with the battery management system BMS; each series unit comprises a battery unit, a fuse F, a bypass switch K, a bypass switch driving circuit DRV and a battery parameter monitoring circuit SEN; the negative end of the battery unit is connected with the first end of the fuse F; the positive end of the bypass switch K is connected with the positive end of the battery unit, and the connection point of the bypass switch K is used as the positive end of the series connection unit; the negative end of the bypass switch K is connected with the second end of the fuse F, and the connection point of the bypass switch K is used as the negative end of the series unit; the negative end of the previous series unit is connected with the positive end of the next series unit, the positive end of the uppermost series unit is the positive electrode of the battery pack, and the negative end of the lowermost series unit is the negative electrode of the battery pack; the bypass switch driving circuit DRV and the battery parameter monitoring circuit SEN of each series unit are respectively connected to the battery management system BMS.
For better technical effect, the technical features of the present invention may be specifically the following technical features:
1. the battery unit is a single battery cell B.
2. The battery unit is a battery monomer parallel block formed by connecting a plurality of battery monomers B in parallel.
3. The battery unit is a battery monomer series block formed by connecting a plurality of battery monomers B in series.
The battery pack which keeps running after the battery units with partial faults are automatically disconnected has the following advantages:
1. when a battery unit in a certain series unit is in failure, the battery pack can still keep running by automatically disconnecting the failed battery unit from the system. The system can still keep running, and strive for continuous running time before maintenance for the electric equipment, such as the electric automobile continues to run to a maintenance station.
2. Only when the number of the battery units with faults reaches a certain number, the voltage of the battery pack is reduced to be below a certain threshold value, the battery pack can enter a state of stopping working, the operation of the electric equipment is ensured to the maximum extent, and the loss of the system caused by the battery faults is reduced to the minimum.
3. When the number of the series units with faults reaches a certain number and the voltage of the battery pack drops below a certain threshold value, the battery pack enters a state of stopping working. The unsafe events or other losses caused by sudden shutdown of the electric equipment, such as the anchoring of the electric automobile on an unsafe road section, are avoided.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of a battery pack according to the present invention that maintains operation after automatically disengaging partially failed battery cells
Fig. 2 is a schematic view of a first embodiment of the series unit 7 of the battery pack remaining in operation after the automatic disconnection of a partially failed battery cell shown in fig. 1
Fig. 3 is a schematic view of a second embodiment of the series unit 7 of the battery pack remaining in operation after the automatic disconnection of a partially failed battery cell shown in fig. 1
Fig. 4 is a schematic view of a third embodiment of the series unit 7 of the battery pack remaining in operation after the automatic disconnection of the partially failed battery cell shown in fig. 1
The specific implementation mode is as follows:
to better illustrate the present invention, one embodiment of the present invention is described in detail below with reference to FIGS. 1-4.
The first embodiment is as follows:
as shown in fig. 1, which is a schematic diagram of a circuit structure of a battery pack that maintains operation after a partially failed battery unit is automatically disconnected according to the present invention, in fig. 1, a battery pack that maintains operation after a partially failed battery unit is automatically disconnected includes a battery management system BMS and a plurality of series units 7, the series units 7 are connected in series, and each series unit 7 is connected to the battery management system BMS;
each series unit 7 comprises a battery unit 9, a fuse F, a bypass switch K, a bypass switch driving circuit DRV and a battery parameter monitoring circuit SEN; the negative terminal 92 of the battery cell 9 is connected to the first end 1 of the fuse F; the positive terminal 3 of the bypass switch K is connected to the positive terminal 91 of the battery cell 9, the connection point of which serves as the positive terminal 5 of the series unit 7; the negative terminal 4 of the bypass switch K is connected to the second end 2 of the fuse F, and the connection point is the negative terminal 6 of the series unit 7;
the negative end 6 of the previous series unit 7 is connected with the positive end 5 of the next series unit, the positive end 5 of the uppermost series unit is the positive electrode of the battery pack, and the negative end 6 of the lowermost series unit is the negative electrode of the battery pack;
the bypass switch driving circuit DRV and the battery parameter monitoring circuit SEN of each series unit 7 are respectively connected to the battery management system BMS.
In practical applications, the battery units 9 in the series unit 7 may be formed by different numbers of single batteries and different connection manners according to practical situations. The different connection methods of the unit cells in the battery unit will be described below.
Fig. 2 shows a first embodiment of the series unit 7 of the present embodiment, in which the battery unit 9 of the series unit 7 includes only one battery cell B.
As shown in fig. 2, in the present embodiment, each series unit 7 includes a battery cell 9, a fuse F, a bypass switch K, a bypass switch drive circuit DRV, a battery parameter monitoring circuit SEN; the negative terminal 92 of the battery cell 9 is connected to the first end 1 of the fuse F; the positive terminal 3 of the bypass switch K is connected to the positive terminal 91 of the battery cell 9, the connection point of which serves as the positive terminal 5 of the series unit 7; the negative terminal 4 of the bypass switch K is connected to the second end 2 of the fuse F, the connection point of which is the negative terminal 6 of the series unit 7. In the present embodiment, the battery unit 9 includes only one battery cell B.
Fig. 3 shows a second embodiment of the series unit 7 in this embodiment, in which the battery unit 9 of the series unit 7 is a battery cell parallel block formed by connecting a plurality of battery cells B in parallel.
As shown in fig. 3, in the present embodiment, each series unit 7 includes a battery cell 9, a fuse F, a bypass switch K, a bypass switch drive circuit DRV, a battery parameter monitoring circuit SEN; the negative terminal 92 of the battery cell 9 is connected to the first end 1 of the fuse F; the positive terminal 3 of the bypass switch K is connected to the positive terminal 91 of the battery cell 9, the connection point of which serves as the positive terminal 5 of the series unit 7; the negative terminal 4 of the bypass switch K is connected to the second end 2 of the fuse F, the connection point of which is the negative terminal 6 of the series unit 7. In this embodiment, the battery unit 9 is a battery cell parallel block formed by connecting a plurality of battery cells B in parallel.
Fig. 4 shows a third embodiment of the series unit 7 in this embodiment, in which the battery unit 9 of the series unit 7 is a battery cell parallel block formed by connecting a plurality of battery cells B in parallel.
As shown in fig. 4, in the present embodiment, each series unit 7 includes a battery cell 9, a fuse F, a bypass switch K, a bypass switch drive circuit DRV, a battery parameter monitoring circuit SEN; the negative terminal 92 of the battery cell 9 is connected to the first end 1 of the fuse F; the positive terminal 3 of the bypass switch K is connected to the positive terminal 91 of the battery cell 9, the connection point of which serves as the positive terminal 5 of the series unit 7; the negative terminal 4 of the bypass switch K is connected to the second end 2 of the fuse F, the connection point of which is the negative terminal 6 of the series unit 7. In this embodiment, the battery unit 9 is a battery cell series block formed by connecting a plurality of battery cells B in series.
The working principle of the technical solution of the present invention is described below with reference to the embodiments.
The working principle is as follows:
when the battery management system BMS detects that all the battery units 9 are operating normally through the battery parameter monitoring circuit SEN in each series unit 7, the bypass switch K of each series unit 7 is in an off state, and all the battery units 9 are all connected in series through the fuse F and output to a load.
When the battery parameter monitoring circuit SEN detects that a battery unit 9 in a certain series unit 7 works abnormally, the bypass switch K of the series unit 7 is switched to be in a closed state, the fuse F of the series unit 7 is fused, a fault battery unit is automatically disconnected from the system, a system current path is switched to the bypass switch K of the series unit 7, and the battery pack can keep running continuously.
When the number of the series units with faults reaches a certain number and the voltage of the battery pack drops below a certain threshold value, the battery pack enters a state of stopping working.
The technical scheme of the utility model can be applied to lithium ion battery systems or other types of battery systems.
The battery pack which keeps running after the battery units with the faults are automatically disconnected can be applied to various battery application occasions, such as electric vehicles or other electric equipment.
Claims (4)
1. A battery pack that remains operational after automatically disengaging partially failed battery cells, comprising: the battery management system BMS and the series units (7) are included, the series units (7) are connected in series, and each series unit (7) is connected with the battery management system BMS;
each series unit (7) comprises a battery unit (9), a fuse F, a bypass switch K, a bypass switch driving circuit DRV and a battery parameter monitoring circuit SEN; the negative end (92) of the battery cell (9) is connected to the first end (1) of the fuse F; the positive end (3) of the bypass switch K is connected with the positive end (91) of the battery unit (9), and the connection point of the bypass switch K is used as the positive end (5) of the series unit (7); the negative end (4) of the bypass switch K is connected with the second end (2) of the fuse F, and the connection point of the bypass switch K is used as the negative end (6) of the series unit (7);
the negative end (6) of the last series unit (7) is connected with the positive end (5) of the next series unit, the positive end (5) of the top series unit is the positive electrode of the battery pack, and the negative end (6) of the lowest series unit is the negative electrode of the battery pack;
the bypass switch driving circuit DRV and the battery parameter monitoring circuit SEN of each series unit (7) are respectively connected to the battery management system BMS.
2. The battery pack that remains in operation after automatically disengaging a partially failed battery cell as in claim 1, wherein: the battery unit (9) is a single battery cell B.
3. The battery pack that remains in operation after automatically disengaging a partially failed battery cell as in claim 1, wherein: the battery unit (9) is a battery monomer parallel block formed by connecting a plurality of battery monomers B in parallel.
4. The battery pack that remains in operation after automatically disengaging a partially failed battery cell as in claim 1, wherein: the battery unit (9) is a battery monomer series block formed by connecting a plurality of battery monomers B in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121167647.5U CN215451508U (en) | 2021-05-28 | 2021-05-28 | Battery pack capable of keeping running after automatic disconnection of partial fault battery units |
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| CN202121167647.5U CN215451508U (en) | 2021-05-28 | 2021-05-28 | Battery pack capable of keeping running after automatic disconnection of partial fault battery units |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548483A (en) * | 2022-11-30 | 2022-12-30 | 绿能慧充数字技术有限公司 | Energy storage system and control method thereof |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115548483A (en) * | 2022-11-30 | 2022-12-30 | 绿能慧充数字技术有限公司 | Energy storage system and control method thereof |
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