CN214755570U - Lithium battery parallel charging and discharging system - Google Patents
Lithium battery parallel charging and discharging system Download PDFInfo
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- CN214755570U CN214755570U CN202120185866.XU CN202120185866U CN214755570U CN 214755570 U CN214755570 U CN 214755570U CN 202120185866 U CN202120185866 U CN 202120185866U CN 214755570 U CN214755570 U CN 214755570U
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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 lithium battery parallel charging and discharging system, which comprises a BMS module and a lithium battery module; the lithium battery module at least comprises two lithium batteries connected in parallel, and each lithium battery is provided with a battery anode pin, a battery cathode pin, an ID detection pin, an NTC detection pin and an SOC detection pin; the BMS module comprises a master control BMS, a charge-discharge interface and a plurality of slave control BMSs, and the number of the slave control BMSs corresponds to that of the lithium batteries; each pin of the lithium battery is electrically connected with the corresponding slave control BMS; the slave control BMS is provided with a charging pin, a discharging pin, a battery interface, a first communication pin and a plurality of data detection pins, the first communication pin is electrically connected with the master control BMS, and each pin in the battery interface is electrically connected with a battery anode pin, a battery cathode pin, an ID detection pin, an NTC detection pin and an SOC detection pin of the lithium battery in a one-to-one manner. The utility model discloses can realize the charge-discharge control of a plurality of batteries, satisfy the demand of using promptly, practice thrift the cost simultaneously.
Description
Technical Field
The utility model relates to a lithium cell charge-discharge technical field especially relates to a parallelly connected charge-discharge system of lithium cell.
Background
The power demand of the whole vehicle is higher and higher, but the requirement for convenient charging of the whole vehicle is higher and higher at the same time; the large power needs the battery support with large battery capacity, but the large-capacity battery can not meet the requirement of convenient charging of users regardless of the volume and the weight, and the problem of parallel connection or serial connection among a plurality of batteries exists unless the battery is decomposed into two or even 3. The existing scheme of parallel connection between lithium batteries is as follows: 1. the direct reverse diode that adds at two lithium electricity output advantage: the output part between the two batteries is not interfered mutually: the method has no way of realizing the reverse charging 2 and adding a central controller, and realizes the advantages of parallel-series connection control of two batteries: can meet the use requirement and disadvantages: a component is added, increasing cost-not to mention a failure point.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a parallelly connected charge-discharge system of lithium cell can realize the charge-discharge control of a plurality of batteries, has satisfied the demand of using promptly, has practiced thrift the cost simultaneously.
In order to realize the purpose, the technical scheme of the utility model is that:
a lithium battery parallel charging and discharging system comprises a BMS module and a lithium battery module; the lithium battery module at least comprises two lithium batteries connected in parallel, and each lithium battery is provided with a battery anode pin, a battery cathode pin, an ID detection pin, an NTC detection pin and an SOC detection pin; the BMS module comprises a master control BMS, a charge-discharge interface and a plurality of slave control BMSs, and the number of the slave control BMSs corresponds to that of the lithium batteries; each pin of the lithium battery is electrically connected with the corresponding slave control BMS; the slave control BMS is provided with a charging pin, a discharging pin, a battery interface, a first communication pin and a plurality of data detection pins, the first communication pin is electrically connected with the master control BMS, and each pin in the battery interface is electrically connected with a battery anode pin, a battery cathode pin, an ID detection pin, an NTC detection pin and an SOC detection pin of the lithium battery in a one-to-one manner; the main control BMS is connected to a CAN bus network of the whole vehicle through a CAN interface; and the charging and discharging interface is provided with a CAN interface connected with a CAN bus network.
Preferably, the slave BMS comprises a slave control chip, a sampling circuit, a charge and discharge switch circuit and a first 485 communication module; the charging and discharging interface comprises a charging pin and a discharging pin; the charging and discharging switch circuit is provided with an input end, an output end, a common end and a control end, wherein the input end is electrically connected with the charging pin, the output end is electrically connected with the discharging pin, the control end is electrically connected with the slave control chip, and the common end is electrically connected with the battery socket; the first 485 communication module is electrically connected with the slave control chip; one end of the sampling circuit is electrically connected with the battery plug interface, and the other end of the sampling circuit is electrically connected with the slave control chip.
Preferably, an equalizing chip and a first optical isolation circuit are further arranged between the sampling circuit and the slave control chip.
Preferably, the model of the equalization chip is ltc 6802.
Preferably, the charge and discharge switching circuit comprises a discharge switching tube and a charge switching tube; the discharge switch tube and the charge switch tube are both MOS tubes; the charging switch tube is connected in series between the public end and the charging pin, and the discharging switch tube is connected in series between the public end and the discharging pin.
Preferably, the master control BMS includes a master control chip and a plurality of second 485 communication modules; the main control chip is connected to a CAN bus network of the whole vehicle through a CAN interface; and the plurality of second 485 communication modules are electrically connected with the second 485 communication modules of the slave BMSs.
Preferably, a second optical isolation circuit with a model number of 6N137 is configured between the CAN interface on the charge-discharge interface and the CAN bus network.
The utility model discloses technical effect mainly embodies in following aspect: the slave BMS CAN sample the voltage information, the temperature information and the like of the lithium battery by the circuit, transmit the voltage information, the temperature information and the like to the master BMS through 485 communication, and uniformly distribute the voltage information, the temperature information and the like to the CAN bus network after being processed by the master BMS; the master control BMS sends out instructions according to the SOC information of each lithium battery, and the slave control BMS controls the on/off of the corresponding discharge switch tube and the corresponding charge switch tube after receiving the instructions; the charger with the CAN interface acquires the required charging current information from the CAN bus network, so as to output corresponding charging current to the lithium battery.
Drawings
FIG. 1 is an overall block diagram of a lithium battery parallel charging and discharging system in an embodiment;
fig. 2 is a block diagram of the slave BMS in the embodiment;
fig. 3 is a block diagram of the master BMS in the embodiment.
Reference numerals: 100. a CAN bus network; 200. a main control BMS module; 210. a main control chip; 220. a CAN interface; 230. a second 485 communication module; 300. a slave BMS module; 310. a slave control chip; 320. a first 485 communication module; 330. a first optical isolation circuit; 340. equalizing the chip; 350. a sampling circuit; 360. a battery socket; 370. a discharge pin; 380. a charging pin.
Detailed Description
The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings, so that the technical solution of the present invention can be more easily understood and grasped.
Referring to fig. 1, the present embodiment provides a lithium battery parallel charging and discharging system including a BMS module and a lithium battery module.
The lithium battery module at least comprises two lithium batteries connected in parallel, and each lithium battery is provided with a battery anode pin, a battery cathode pin, an ID detection pin, an NTC detection pin and an SOC detection pin.
The BMS module comprises a master control BMS, a charge-discharge interface and a plurality of slave control BMSs, wherein the number of the slave control BMSs corresponds to that of the lithium batteries. The charging and discharging interface is provided with a CAN interface 220 connected to the CAN bus network 100 to facilitate communication between the charger with the CAN interface 220 and the CAN bus network 100. A second optical isolation circuit, whose model is 6N137, is configured between the CAN interface 220 on the charge and discharge interface and the CAN bus network 100.
Referring to fig. 3, the master BMS includes a master chip 210 and a plurality of second 485 communication modules 230; the main control chip 210 is connected to the CAN bus network 100 of the entire vehicle through the CAN interface 220.
Referring to fig. 2, the slave BMS includes a charging pin 380, a discharging pin 370, a battery socket 360, and a first communication pin, a slave chip 310, a sampling circuit 350, a charging and discharging switching circuit, and a first 485 communication module 320; the charge and discharge interface includes a charge pin 380 and a discharge pin 370; the charge and discharge switch circuit has an input terminal, an output terminal, a common terminal and a control terminal, wherein the control terminal is electrically connected with the slave control chip 310, and the common terminal is electrically connected with the battery jack 360. More specifically, the charge-discharge switching circuit comprises a discharge switching tube and a charge switching tube; the discharge switch tube and the charge switch tube are both MOS tubes; one end (input end) of the charging switch tube is electrically connected to the charging pin 380, and the other end is electrically connected to the common end; one end (output end) of the discharge switch tube is electrically connected to the discharge pin 370, and the other end is electrically connected to the common terminal. One end of the first 485 communication module 320 is electrically connected with the slave control chip 310, and the other end is electrically connected with the second 485 communication module 230 of the master control BMS. One end of the sampling circuit 350 is electrically connected to the battery jack 360, and the other end is electrically connected to the slave control chip 310. In addition, an equalizing chip 340 and a first optical isolation circuit 330 are further arranged between the sampling circuit 350 and the slave control chip 310, the model of the equalizing chip 340 is ltc6802, and the model of the first optical isolation circuit 330 is 6N 137. The first communication pin is electrically connected with the main control BMS, and each pin in the battery socket 360 is electrically connected with the battery anode pin, the battery cathode pin, the ID detection pin, the NTC detection pin, and the SOC detection pin of the lithium battery in a one-to-one manner.
Discharging multiple batteries in parallel:
the high lithium cell of voltage discharges earlier, and the voltage difference between two lithium cells is less than 1V, perhaps according to the characteristic of electric core, satisfies under the condition that charging current is less than 0.5C, allows two lithium cells to connect in parallel, opens the discharge switch pipe of two lithium cells promptly simultaneously, supports two batteries and discharges simultaneously, reaches the demand that increases whole car battery discharge capacity.
Charging multiple batteries in parallel:
the charger output is 1 to 2 (even 1 to 3,4 more) design, that is, one charger CAN charge two lithium batteries (or more) simultaneously as the multi-battery parallel discharge, the master control is confirmed by identifying the ID during the charging, the battery with low voltage and low SOC is charged first, when the SOC between the two (or three or more) batteries is consistent, the charging switch tubes of the two (or three or more) batteries are turned on simultaneously, and the master control BMS requests the charger to charge a multiple of the minimum charging current supported by the multiple lithium batteries through a CAN message (for example, two batteries, the battery a supports the charging current of 5A, and the battery B supports the charging current of 8A, the requested current of the BMS is 5A to 2 of the battery a), so as to achieve the purpose of improving the charging efficiency.
Of course, the above is only a typical example of the present invention, and besides, the present invention can also have other various specific embodiments, and all technical solutions adopting equivalent replacement or equivalent transformation are all within the scope of the present invention as claimed.
Claims (7)
1. A lithium battery parallel charging and discharging system comprises a BMS module and a lithium battery module; the lithium battery module is characterized by at least comprising two lithium batteries connected in parallel, wherein each lithium battery is provided with a battery anode pin, a battery cathode pin, an ID detection pin, an NTC detection pin and an SOC detection pin; the BMS module comprises a master control BMS, a charge-discharge interface and a plurality of slave control BMSs, and the number of the slave control BMSs corresponds to that of the lithium batteries; each pin of the lithium battery is electrically connected with the corresponding slave control BMS; the slave control BMS is provided with a charging pin (380), a discharging pin (370), a battery interface (360), a first communication pin and a plurality of data detection pins, wherein the first communication pin is electrically connected with the master control BMS, and each pin in the battery interface (360) is electrically connected with a battery anode pin, a battery cathode pin, an ID detection pin, an NTC detection pin and an SOC detection pin of the lithium battery in a one-to-one manner; the master control BMS is connected to a CAN bus network (100) of the whole vehicle through a CAN interface (220); the charging and discharging interface is provided with a CAN interface (220) connected with a CAN bus network (100).
2. The lithium battery parallel charging and discharging system according to claim 1, wherein the slave BMS comprises a slave control chip (310), a sampling circuit (350), a charging and discharging switch circuit, and a first 485 communication module (320); the charging and discharging interface comprises a charging pin (380) and a discharging pin (370); the charging and discharging switch circuit is provided with an input end, an output end, a common end and a control end, wherein the input end is electrically connected with a charging pin (380), the output end is electrically connected with a discharging pin (370), the control end is electrically connected with a slave control chip (310), and the common end is electrically connected with a battery socket (360); the first 485 communication module (320) is electrically connected with the slave control chip (310); one end of the sampling circuit (350) is electrically connected with the battery socket (360), and the other end of the sampling circuit is electrically connected with the slave control chip (310).
3. The lithium battery parallel charging and discharging system as claimed in claim 2, wherein an equalizing chip (340) and a first optical isolation circuit (330) are further arranged between the sampling circuit (350) and the slave control chip (310).
4. The parallel charging and discharging system for the lithium batteries as claimed in claim 3, wherein the type of the equalizing chip (340) is ltc 6802.
5. The system according to claim 4, wherein the charge and discharge switching circuit comprises a discharge switching tube and a charge switching tube; the discharge switch tube and the charge switch tube are both MOS tubes; the charging switch tube is connected in series between the common terminal and a charging pin (380), and the discharging switch tube is connected in series between the common terminal and a discharging pin (370).
6. The lithium battery parallel charging and discharging system according to claim 5, wherein the master control BMS comprises a master control chip (210) and a plurality of second 485 communication modules (230); the main control chip (210) is connected to a CAN bus network (100) of the whole vehicle through a CAN interface (220); and the plurality of second 485 communication modules (230) are electrically connected with the second 485 communication modules (230) of the slave BMSs.
7. The system according to claim 1, wherein a second optical isolation circuit is arranged between the CAN interface (220) on the charge-discharge interface and the CAN bus network (100), and the type number of the second optical isolation circuit is 6N 137.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120185866.XU CN214755570U (en) | 2021-01-22 | 2021-01-22 | Lithium battery parallel charging and discharging system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120185866.XU CN214755570U (en) | 2021-01-22 | 2021-01-22 | Lithium battery parallel charging and discharging system |
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| CN214755570U true CN214755570U (en) | 2021-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243874A (en) * | 2022-01-24 | 2022-03-25 | 上海安世博能源科技有限公司 | Charging and discharging device and charging and discharging method for electric vehicle |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243874A (en) * | 2022-01-24 | 2022-03-25 | 上海安世博能源科技有限公司 | Charging and discharging device and charging and discharging method for electric vehicle |
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Address after: 318000 No. 2178, Haifeng Road, Binhai Industrial block, Taizhou Economic Development Zone, Zhejiang Province Patentee after: Zhejiang Qima Technology Co.,Ltd. Address before: 318000 No. 2178, Haifeng Road, Binhai Industrial block, Taizhou Economic Development Zone, Zhejiang Province Patentee before: Taizhou Blue Electronic Technology Co.,Ltd. |