CN218867962U - Parallel charging and discharging circuit of lithium battery - Google Patents
Parallel charging and discharging circuit of lithium battery Download PDFInfo
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- CN218867962U CN218867962U CN202223592724.9U CN202223592724U CN218867962U CN 218867962 U CN218867962 U CN 218867962U CN 202223592724 U CN202223592724 U CN 202223592724U CN 218867962 U CN218867962 U CN 218867962U
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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 parallel charging and discharging circuit of lithium batteries, which comprises a first charging and discharging branch with a total anode and a second charging and discharging branch with a total cathode, a plurality of lithium batteries and a plurality of battery protection plates in one-to-one correspondence with the lithium batteries; a plurality of lithium cells connect in parallel between first charge-discharge branch road and second charge-discharge branch road, are equipped with first connection branch road between each lithium cell and the first charge-discharge branch road, are equipped with the second between each lithium cell and the second charge-discharge branch road and connect the branch road, and each battery protection shield is equipped with the switch module that is used for breaking off first connection branch road, and switch module locates on the first connection branch road. The parallelly connected charge-discharge circuit of lithium cell through parallelly connected a plurality of lithium cells between first charge-discharge branch road and second charge-discharge branch road, is equipped with first connection branch road simultaneously between each lithium cell and first charge-discharge branch road to be equipped with the break-make that switch module is used for controlling first connection branch road, thereby be favorable to in time cutting off the fine protection electricity core of positive circuit.
Description
Technical Field
The utility model relates to a lithium cell technical field, in particular to parallelly connected charging and discharging circuit of lithium cell.
Background
With the continuous improvement of the development level of economic technology in China, more and more motor homes are being used by common people in China. At present, due to the shortage of the campsites of the motor homes in China, an essential energy storage device in the motor homes is a battery for supplying power to the whole motor home. The mainstream product in the market is a lead-acid storage battery, but the lead-acid storage battery has many defects, such as small energy density, large volume, heavy weight, short service life, serious environmental pollution during manufacturing and the like.
At present, the existing lithium batteries are made into one lithium battery, most of the lithium batteries cannot be used in parallel and are not flexible enough, even if the lithium batteries can be used in parallel, an address of one lithium battery pack and a program of one battery pack cannot be used in parallel of the same program of any battery pack, and the parallel system needs to be additionally provided with an extra control panel to communicate and control each subsystem, so that the system is inconvenient.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to a parallel charging/discharging circuit for lithium batteries, so as to have a better standard versatility.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a parallel charging and discharging circuit of lithium batteries comprises a first charging and discharging branch with a total positive pole, a second charging and discharging branch with a total negative pole, a plurality of lithium batteries and a plurality of battery protection plates in one-to-one correspondence with the lithium batteries;
the plurality of lithium batteries are connected in parallel between the first charge-discharge branch and the second charge-discharge branch, a first connection branch is arranged between each lithium battery and the first charge-discharge branch, a second connection branch is arranged between each lithium battery and the second charge-discharge branch, each battery protection board is provided with a switch assembly for disconnecting the first connection branch, and the switch assembly is arranged on the first connection branch.
Further, the switch component comprises a charging MOS tube and a discharging MOS tube which are connected in series, wherein a drain electrode D of the charging MOS tube is connected with a drain electrode D of the discharging MOS tube, a source electrode S of the charging MOS tube is positioned at one side close to the lithium battery, and a source electrode S of the discharging MOS tube is positioned at one side close to the first charging and discharging branch circuit;
and a one-way conduction element is arranged between the source S and the drain D of the charging MOS tube and the discharging MOS tube.
Further, the one-way conduction element comprises a diode for conducting the source S to the drain D.
Furthermore, a shunt is arranged on the second connecting branch, and the detection end of the shunt is connected with the battery protection board.
Furthermore, the battery protection board also comprises a signal output branch connected with the battery protection board;
and each battery protection board is provided with a communication terminal leading-out branch, and each communication terminal leading-out branch is connected to the signal output branch in parallel.
Furthermore, the battery core in each lithium battery is connected with the corresponding battery protection board.
Furthermore, a third connecting branch for heating the lithium battery is connected between the first connecting branch and the second connecting branch.
Furthermore, a heating film and a heating switch element are arranged on the third connecting branch;
the connection point of the third connection branch and the second connection branch is located at one end, close to the total negative electrode, of the second charge-discharge branch;
and the connection point of the third connection branch and the first connection branch is positioned at one end of the switch assembly close to the first charging and discharging branch.
Furthermore, the heating switch element comprises a heating MOS transistor, a source electrode S of the heating MOS transistor is connected to the first connecting branch, and a drain electrode D of the heating MOS transistor is connected to the third connecting branch.
Compared with the prior art, the utility model discloses following advantage has:
lithium cell charging and discharging circuit that connects in parallel, through parallelly connected between first charge and discharge branch road and second charge and discharge branch road with a plurality of lithium cells, be equipped with first connection branch road simultaneously between each lithium cell and first charge and discharge branch road to be equipped with the break-make that switch module is used for controlling first connection branch road, thereby be favorable to in time cutting off the fine protection electricity core of positive circuit.
In addition, the open tube component comprises a charging MOS tube and a discharging MOS tube which are connected in series, so that a bidirectional path is favorably realized, and the charging and discharging process is better realized. And the one-way conduction element is set as a diode, so that the structure is simple and the arrangement is convenient. In addition, a heating film and a heating switch element are further arranged in the circuit, so that the battery pack can adapt to a wider temperature environment, and the applicability of the lithium battery is improved. The heating switch element is set as a heating MOS tube, so that the structure is simple and the arrangement is convenient.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
fig. 1 is a circuit diagram of parallel charging and discharging of lithium batteries according to an embodiment of the present invention;
description of reference numerals:
1. a total positive electrode; 2. a total negative electrode; 3. a first charge-discharge branch; 4. a second charge-discharge branch; 5. a lithium battery; 6. a battery protection plate; 7. a first connecting branch; 8. a second connecting branch; 9. a charging MOS tube; 10. discharging the MOS tube; 11. a flow divider; 12. a signal output branch; 13. a communication terminal leading-out branch; 14. a third connecting branch; 15. heating the film; 16. and heating the MOS tube.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same order, but are to be construed as referring to the same order.
In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection may be fixed, detachable, or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The present embodiment relates to a parallel charging and discharging circuit of lithium batteries, which comprises, as shown in fig. 1, a first charging and discharging branch 3 having a total positive electrode 1 and a second charging and discharging branch 4 having a total negative electrode 2, and a plurality of lithium batteries 5 and a plurality of battery protection plates 6 corresponding to the plurality of lithium batteries 5 one to one.
Wherein, a plurality of lithium cell 5 connect in parallel between first charge and discharge branch road 3 and second charge and discharge branch road 4, are equipped with first connecting branch road 7 between each lithium cell 5 and the first charge and discharge branch road 3, are equipped with second connecting branch road 8 between each lithium cell 5 and the second charge and discharge branch road 4, and the electric core in each lithium cell 5 links to each other with corresponding battery protection shield 6. Each battery protection board 6 is provided with a switch component for disconnecting the first connecting branch 7, and the switch component is arranged on the first connecting branch 7.
The parallelly connected charge and discharge circuit of lithium cell of this embodiment is through parallelly connected a plurality of lithium cells 5 between first charge and discharge branch road 3 and second charge and discharge branch road 4, is equipped with first connection branch road 7 simultaneously between each lithium cell 5 and first charge and discharge branch road 3 to be equipped with the break-make that switch module is used for controlling first connection branch road 7, thereby be favorable to in time cutting off the fine protection electricity core of positive circuit.
Based on the above design concept, an exemplary structure of the parallel charging and discharging circuit for lithium batteries of the present embodiment is shown in fig. 1, where a first charging and discharging branch 3 connects a total positive electrode 1 of an external power supply and a positive electrode of a lithium battery 5, a second charging and discharging branch 4 connects a total negative electrode 2 of the external power supply and a negative electrode of the lithium battery 5, and a plurality of lithium batteries 5 in the middle are arranged in parallel. And referring to fig. 1, a first connecting branch 7 is provided between each lithium battery 5 and the first charging and discharging branch 3, each lithium battery 5 is communicated with the first charging and discharging branch 3 through each first connecting branch 7, and a switch assembly is provided on the protection board of the lithium battery 5 for controlling the on/off of the first connecting branch 7.
As a preferred embodiment, the switch module includes a charging MOS transistor 9 and a discharging MOS transistor 10 connected in series, a drain D of the charging MOS transistor 9 is connected to a drain D of the discharging MOS transistor 10, a source S of the charging MOS transistor 9 is located at a side close to the lithium battery 5, and a source S of the discharging MOS transistor 10 is located at a side close to the first charging/discharging branch 3. And preferably, a one-way conduction element is arranged between the source S and the drain D of the charging MOS tube 9 and the discharging MOS tube 10. The on-off of the circuit is controlled through the one-way conduction element.
Specifically, the source S of the discharging MOS transistor 10 is communicated with the first connecting branch 7, the drain D of the charging MOS transistor 9 is connected with the drain D of the discharging MOS transistor 10, the source S of the charging MOS transistor 9 is communicated with the anode of the lithium battery 5, and the gates G of the charging MOS transistor 9, the discharging MOS transistor 10 and the heating MOS transistor 16 are connected with the driving circuit on the battery protection board 6. The driving circuit is in the prior art and is used for driving the charging MOS tube 9, the discharging MOS tube 10 and the heating MOS tube 16 to be opened and closed.
When the circuit is in a charging state, current flows out through the total anode 1, flows to the source S of the discharging MOS tube 10 on the protection plate through the first charging and discharging circuit, at the moment, a diode between the source S and the drain D of the discharging MOS tube 10 is in a forward conduction state, then the current flows to the drain D of the charging MOS tube 9, as the diode in the charging MOS tube 9 is in a reverse blocking state, at the moment, the current forms a passage between the source S and the drain D through the communication between the G pole of the charging MOS tube 9 and the driving circuit, finally flows to the anode of the lithium battery 5, and flows out through the cathode of the lithium battery 5 and returns to the total cathode 2.
When the circuit is in a discharging state, current flows out through the anode of the lithium battery 5 and flows to the source S of the charging MOS tube 9 on the protection plate, at the moment, a diode between the source S and the drain D of the charging MOS tube 9 is in a forward conduction state, then the current flows to the drain D of the discharging MOS tube 10, as the diode in the discharging MOS tube 10 is in a reverse blocking state, at the moment, the current forms a passage between the source S and the drain D through the communication between the G pole of the discharging MOS tube 10 and the driving circuit, finally flows to the total anode 1, and after power supply to external equipment is completed, the current flows to the cathode of the lithium battery 5 through the total cathode 2.
In a preferred embodiment, a shunt 11 is provided on the second connecting branch 8 between the overall negative pole 2 and the negative pole of the lithium battery 5, and two detection terminals of the shunt 11 are connected to the protection plate of the lithium battery 5 for detecting the current in the protection plate 6.
In addition, the parallel charging and discharging circuit of the lithium battery 5 in the present embodiment further includes a signal output branch 12 connected to the battery protection board 6. Communication terminal leading-out branches 13 are arranged on the battery protection boards 6, the communication terminal leading-out branches 13 are connected on the signal output branch 12 in parallel, the communication terminals respectively provide different state information of the lithium battery 5, the information is transmitted to a leading-out branch communication control system through the communication terminal leading-out branches 13, and finally the information is displayed on a display screen.
In the present embodiment, as a preferable embodiment, a third connecting branch 14 for heating the lithium battery 5 is connected between the first connecting branch 7 and the second connecting branch 8. Here, referring to fig. 1, a connection point of the third connection branch 14 and the second connection branch 8 is located at one end of the second charge and discharge branch 4 near the total negative electrode 2. The connection point of the third connection branch 14 and the first connection branch 7 is located at one end of the switch assembly close to the first charge and discharge branch 3.
And preferably, the third connecting branch 14 is provided with a heating film 15 and a heating switch element, and the circuit is communicated through the heating switch element under the condition of low external environment, so that the heating film 15 heats the battery pack, thereby ensuring the smooth charging process of the lithium battery 5.
Specifically, as a preferred embodiment, referring to fig. 1, the heating switching element includes a heating MOS transistor 16, a source S of the heating MOS transistor 16 is connected to the first connecting branch 7, and a drain D of the heating MOS transistor 16 is connected to the third connecting branch 14.
When the aforementioned circuit performs a charging process, a current flowing from the main anode 1 flows to the heating film 15 through the heating MOS tube 16 and then flows into the negative electrode of the lithium battery 5, wherein the heating film 15 itself generates heat to heat the lithium battery 5 to resist a low temperature environment.
It should be noted that, in this embodiment, the multiple lithium batteries 5 automatically address each battery pack according to the turn-on time, and perform automatic allocation of the master and the slave, where the master is turned on first, and the slave is turned on later, and the slave is sequentially ordered. In this embodiment, at most 16 battery packs are supported and arranged simultaneously.
The host actively collects information of each slave, MOS (metal oxide semiconductor) tube control is carried out on the slave, and meanwhile, the host sends power system data to the display screen through each communication terminal. When the main machine is in fault, the main machine is switched into a system, the first slave machine is automatically upgraded into the main machine to control other slave machines, and warning information is sent to prompt personnel to maintain. When the slave machine has a fault, the slave machine is switched out of the system, the addresses of other slave machines are unchanged, and warning information is sent to prompt personnel to maintain.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A lithium battery parallel charging and discharging circuit is characterized in that:
the charging and discharging device comprises a first charging and discharging branch with a total positive pole, a second charging and discharging branch with a total negative pole, a plurality of lithium batteries and a plurality of battery protection plates in one-to-one correspondence with the lithium batteries;
the plurality of lithium batteries are connected in parallel between the first charge-discharge branch and the second charge-discharge branch, a first connection branch is arranged between each lithium battery and the first charge-discharge branch, a second connection branch is arranged between each lithium battery and the second charge-discharge branch, each battery protection board is provided with a switch assembly for disconnecting the first connection branch, and the switch assembly is arranged on the first connection branch.
2. The parallel charging and discharging circuit of lithium batteries according to claim 1, wherein:
the switch component comprises a charging MOS tube and a discharging MOS tube which are connected in series, wherein a drain electrode D of the charging MOS tube is connected with a drain electrode D of the discharging MOS tube, a source electrode S of the charging MOS tube is positioned on one side close to the lithium battery, and a source electrode S of the discharging MOS tube is positioned on one side close to the first charging and discharging branch circuit;
and a one-way conduction element is arranged between the source S and the drain D of the charging MOS tube and the discharging MOS tube.
3. The parallel charging and discharging circuit of lithium batteries according to claim 2, wherein:
the unidirectional conducting element comprises a diode conducting the source S to the drain D.
4. The parallel charging and discharging circuit of lithium batteries according to claim 1, wherein:
and a shunt is arranged on the second connecting branch, and the detection end of the shunt is connected with the battery protection board.
5. The parallel charging and discharging circuit of lithium batteries according to claim 1, wherein:
the battery protection board is connected with the battery protection board;
and each battery protection board is provided with a communication terminal leading-out branch, and each communication terminal leading-out branch is connected to the signal output branch in parallel.
6. The parallel charging and discharging circuit of lithium batteries according to claim 1, wherein:
and the battery core in each lithium battery is connected with the corresponding battery protection board.
7. The parallel charging and discharging circuit of lithium batteries according to any one of claims 1 to 6, characterized in that:
and a third connecting branch for heating the lithium battery is connected between the first connecting branch and the second connecting branch.
8. The parallel charging and discharging circuit of lithium batteries according to claim 7, wherein:
a heating film and a heating switch element are arranged on the third connecting branch;
the connection point of the third connection branch and the second connection branch is located at one end, close to the total negative electrode, of the second charge-discharge branch;
and the connection point of the third connection branch and the first connection branch is positioned at one end of the switch assembly close to the first charge-discharge branch.
9. The parallel charging and discharging circuit of lithium batteries according to claim 8, wherein:
the heating switch element comprises a heating MOS tube, a source electrode S of the heating MOS tube is connected with the first connecting branch, and a drain electrode D of the heating MOS tube is connected with the third connecting branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223592724.9U CN218867962U (en) | 2022-12-30 | 2022-12-30 | Parallel charging and discharging circuit of lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223592724.9U CN218867962U (en) | 2022-12-30 | 2022-12-30 | Parallel charging and discharging circuit of lithium battery |
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| Publication Number | Publication Date |
|---|---|
| CN218867962U true CN218867962U (en) | 2023-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223592724.9U Active CN218867962U (en) | 2022-12-30 | 2022-12-30 | Parallel charging and discharging circuit of lithium battery |
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| CN (1) | CN218867962U (en) |
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- 2022-12-30 CN CN202223592724.9U patent/CN218867962U/en active Active
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