CN217544712U - Battery pack parallel control circuit - Google Patents
Battery pack parallel control circuit Download PDFInfo
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- CN217544712U CN217544712U CN202221560749.8U CN202221560749U CN217544712U CN 217544712 U CN217544712 U CN 217544712U CN 202221560749 U CN202221560749 U CN 202221560749U CN 217544712 U CN217544712 U CN 217544712U
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- normally open
- contactor
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- open contact
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Abstract
A parallel control circuit for battery packs relates to the field of battery pack control. The device comprises two diodes which are packaged in a mutual cathode mode, a controller, KM1 and KM2; the diode which is packaged by the two geminate transistors in a common cathode mode is provided with a first positive contact, a second positive contact and a first negative contact; the first normally open contact of KM1 is electrically connected with the first positive contact, the second normally open contact of KM1 is electrically connected with the first negative contact, and the first normally open contact of KM1 and the second normally open contact of KM1 are a pair of corresponding normally open contacts on KM 1; the first normally open contact of KM2 is electrically connected with the second normally open contact of KM 1; a second normally open contact of KM2 is electrically connected with a second positive contact; the first normally open contact of KM2 and the second normally open contact of KM2 are a pair of corresponding normally open contacts on KM2; the positive electrode of the first output of the controller is electrically connected with the first normally open contact of KM1, the positive electrode of the second output of the controller is electrically connected with the second normally open contact of KM1, and the positive electrode of the third output of the controller is electrically connected with the second normally open contact of KM 2.
Description
Technical Field
The utility model relates to a battery package field especially relates to a battery package parallel control circuit.
Background
The battery pack is a basic unit of energy storage. The performance and the service life of the battery pack are the most key technical indexes of the energy storage system. The battery pack with basically consistent performance plays a crucial role in maintaining the performance of the battery pack, especially when the voltage difference of the battery pack is in series-parallel connection within the range of 1% of rated voltage. When the battery packs with larger voltage deviation are connected in parallel, an electric loop is formed at the moment of parallel connection, the high-voltage battery pack discharges, the low-voltage battery pack charges, and meanwhile, because the internal resistance of the battery is very low, generally dozens of m omega, and the loop current is very large, the battery core generates heat, the original part of the loop is damaged, an electric accident is easily formed, and the service life of the battery pack is shortened.
SUMMERY OF THE UTILITY MODEL
In order to realize the series-parallel connection of battery well, reduce the electric accident of series-parallel connection in-process, keep performance, the life of battery package, the utility model discloses a following technical scheme:
a parallel control circuit of a battery pack comprises two diodes which are packaged in a common cathode mode by geminate transistors, a controller, a first contactor KM1 and a second contactor KM2;
the diode which is packaged by the two geminate transistors in a common cathode mode is provided with a first positive contact, a second positive contact and a first negative contact;
a first normally open contact of the first contactor KM1 is electrically connected with a first positive contact, a second normally open contact of the first contactor KM1 is electrically connected with a first negative contact, and the first normally open contact of the first contactor KM1 and the second normally open contact of the first contactor KM1 are a pair of corresponding normally open contacts on the first contactor KM 1;
a first normally open contact of the second contactor KM2 is electrically connected with a second normally open contact of the first contactor KM 1; a second normally open contact of the second contactor KM2 is electrically connected with a second positive contact; a first normally open contact of the second contactor KM2 and a second normally open contact of the second contactor KM2 are a pair of corresponding normally open contacts on the second contactor KM2;
the first output positive electrode of the controller is electrically connected with the first normally open contact of the first contactor KM1,
the second output positive electrode of the controller is electrically connected with the second normally open contact of the first contactor KM1,
and the third output positive electrode of the controller is electrically connected with the second normally open contact of the second contactor KM 2.
Specifically, the controller is a BMS battery control module.
Specifically, a plurality of battery packs are connected in parallel or in series, and the total output positive electrodes of the battery packs connected in parallel or in series are electrically connected with the first normally open contact of the first contactor KM 1; and the total output negative electrode of the battery packs connected in parallel or in series is electrically connected with the output negative electrode of the controller.
In summary, the device has the following advantages: the parallel connection of the battery packs is realized, the electrical accidents in the series-parallel connection process are reduced, the performance and the service life of the battery packs are maintained, the parallel connection control power electronic circuit is integrated in the battery packs, the intelligent control of the parallel connection of the battery packs is realized through the discharge diode, the contactor, the voltage acquisition circuit and the controller, the electrical accidents are prevented from happening in the parallel connection of the battery packs, the parallel current is controlled within a certain range, and the performance of the battery packs is maintained.
Drawings
Fig. 1 is a schematic diagram of a parallel control circuit of a battery pack;
reference numerals: 1 diode; 101 a first positive contact; 102 a second positive contact; 103 a first negative contact;
2BMS battery control modules; 201 a first output positive pole; 202 a second output positive pole; 203 a third output positive electrode;
3 a plurality of battery packs connected in series or in parallel;
401 a first normally open contact of the second contactor KM2; 402 second normally open contacts of the second contactor KM2; 501 a first normally open contact of a first contactor KM 1; 502 second normally open contact of the first contactor KM 1.
Detailed Description
The present invention will be further described with reference to fig. 1.
A parallel control circuit of a battery pack comprises two diodes which are packaged in a common cathode mode by geminate transistors, a controller, a first contactor KM1 and a second contactor KM2; wherein the controller is a BMS battery control module.
A first positive contact, a second positive contact and a first negative contact are arranged on the diode which is packaged by the two geminate transistors in a common cathode mode;
a first normally open contact of the first contactor KM1 is electrically connected with a first positive contact, a second normally open contact of the first contactor KM1 is electrically connected with a first negative contact, and the first normally open contact of the first contactor KM1 and the second normally open contact of the first contactor KM1 are a pair of corresponding normally open contacts on the first contactor KM 1;
a first normally open contact of the second contactor KM2 is electrically connected with a second normally open contact of the first contactor KM 1; a second normally open contact of the second contactor KM2 is electrically connected with a second positive contact; the first normally open contact of the second contactor KM2 and the second normally open contact of the second contactor KM2 are a pair of corresponding normally open contacts on the second contactor KM2;
the first output positive electrode of the controller is electrically connected with the first normally open contact of the first contactor KM1,
the second output positive electrode of the controller is electrically connected with the second normally open contact of the first contactor KM1,
and the third output positive electrode of the controller is electrically connected with the second normally open contact of the second contactor KM 2.
In order to control the voltage of the plurality of battery packs, the plurality of battery packs are connected in parallel or in series, and the total output positive electrode of the battery packs connected in parallel or in series is connected with the first normally open contact of the first contactor KM1 through a direct current bus; and the total output negative electrode of the battery packs connected in parallel or in series is connected with the output negative electrode of the controller through a direct current bus.
The working principle of the parallel control circuit of the battery pack is as follows:
as can be seen from fig. 1:
(1) the voltage at the location is: the DC bus voltage of the battery pack;
(2) the voltage at the location is: the voltage of the battery pack or bus through the diode;
(3) the voltage at the location is: a battery pack voltage;
the controller detects the voltages at the (1) and (3) positions,
when the position voltage (1) is higher than the position voltage (3), the bus voltage of the battery pack to be connected in parallel is larger than the voltage of the battery pack, the controller charges the battery pack through the direct-current bus until the deviation between the position voltage (1) and the position voltage (3) is detected to be within 1%, a charging loop is cut off, the first contactor KM1 is closed, and grid connection is completed.
When the (3) position voltage is greater than the (1) position voltage, the bus voltage indicating that the battery packs are to be connected in parallel is smaller than the voltage of the battery packs. And the battery pack is controlled by the BMS controller to discharge for the bus until the deviation between the voltage of the battery pack and the voltage of the bus is within 1 percent, a discharging loop is cut off, and the second contactor KM2 is closed to complete grid connection.
In summary, the device has the following advantages: the parallel connection of the battery packs is realized, the electrical accidents in the series-parallel connection process are reduced, the performance and the service life of the battery packs are maintained, the parallel connection control power electronic circuit is integrated in the battery packs, the intelligent control of the parallel connection of the battery packs is realized through the discharge diode, the contactor, the voltage acquisition circuit and the controller, the electrical accidents are prevented from happening in the parallel connection of the battery packs, the parallel current is controlled within a certain range, and the performance of the battery packs is maintained.
It should be understood that the above detailed description of the present invention is only for illustrative purposes and is not limited to the technical solutions described in the embodiments of the present invention. It will be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted to achieve the same technical effects; as long as the use requirement is satisfied, the utility model is within the protection scope.
Claims (3)
1. A parallel control circuit of a battery pack is characterized by comprising two diodes which are packaged in a manner of being connected with a pair of tubes in a cathode mode, a controller, a first contactor KM1 and a second contactor KM2;
a first anode contact, a second anode contact and a first cathode contact are arranged on the diode which is packaged by the two geminate transistors in a common cathode mode;
a first normally open contact of the first contactor KM1 is electrically connected with the first positive contact, a second normally open contact of the first contactor KM1 is electrically connected with the first negative contact, and the first normally open contact of the first contactor KM1 and the second normally open contact of the first contactor KM1 are a pair of corresponding normally open contacts on the first contactor KM 1;
a first normally open contact of the second contactor KM2 is electrically connected with a second normally open contact of the first contactor KM 1; a second normally open contact of the second contactor KM2 is electrically connected with the second positive contact; a first normally open contact of the second contactor KM2 and a second normally open contact of the second contactor KM2 are a pair of corresponding normally open contacts on the second contactor KM2;
a first output positive electrode of the controller is electrically connected with a first normally open contact of the first contactor KM1,
the second output positive electrode of the controller is electrically connected with the second normally open contact of the first contactor KM1,
and the third output positive electrode of the controller is electrically connected with the second normally open contact of the second contactor KM 2.
2. The parallel battery pack control circuit according to claim 1, wherein the controller is a BMS battery control module.
3. The battery pack parallel control circuit according to claim 1, wherein a plurality of battery packs are connected in parallel or in series, and the total output positive electrode of the battery packs connected in parallel or in series is electrically connected with the first normally open contact of the first contactor KM 1; and the total output negative electrode of the battery packs connected in parallel or in series is electrically connected with the output negative electrode of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221560749.8U CN217544712U (en) | 2022-06-21 | 2022-06-21 | Battery pack parallel control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221560749.8U CN217544712U (en) | 2022-06-21 | 2022-06-21 | Battery pack parallel control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217544712U true CN217544712U (en) | 2022-10-04 |
Family
ID=83420020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221560749.8U Active CN217544712U (en) | 2022-06-21 | 2022-06-21 | Battery pack parallel control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217544712U (en) |
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2022
- 2022-06-21 CN CN202221560749.8U patent/CN217544712U/en active Active
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