CN211377659U

CN211377659U - BMS switch topology circuit

Info

Publication number: CN211377659U
Application number: CN202020287259.XU
Authority: CN
Inventors: 黄斌; 郅海兵
Original assignee: Shanghai Enjie Electronic Technology Co ltd
Current assignee: Shanghai Enjie Electronic Technology Co ltd
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2020-08-28
Anticipated expiration: 2030-03-10

Abstract

The utility model relates to a battery management technology field specifically is a BMS switch topology circuit, and the circuit includes B + end, B-end, P + end, P-end and control chip, B + end with P + end is located the both ends of a wire respectively, B-end with P-end is located the both ends of another wire respectively, B + end with it has discharge switch and charge switch to establish ties between the P + end, just control chip is used for control opening and shutting of discharge switch and charge switch, be connected with the group battery that is used for charging and discharging between B + end and the B-end, B + end with still be connected with between the P + end and be used for doing the DC power that the group battery charges. This BMS switch topology circuit utilizes two N type MOS pipes as the discharge switch and the charge switch of circuit, and two N type MOS pipes establish ties between B + end and P +, and the phenomenon of shallow discharge of shallow charging when preventing to appear the battery long-term float, practices thrift the cost, and the preparation is simple and convenient.

Description

BMS switch topology circuit

Technical Field

The utility model relates to a battery management technology field specifically is a BMS switch topology circuit.

Background

BMS (BATTERY MANAGEMENT SYSTEM) is an acronym for BATTERY management system, a link between a BATTERY and a user. Its main object is secondary battery, mainly just in order to improve the utilization ratio of battery, prevents that overcharge and overdischarge from appearing in the battery, can be used to electric automobile, storage battery car, robot, unmanned aerial vehicle etc..

At present, when the existing battery management system is used, a high-current topology adopts a P-type MOS tube to control between a B-end and a P-end in a circuit, the P-type MOS tube is expensive, the manufacturing difficulty is high, and the condition of shallow charging and shallow discharging is easy to occur when a battery is subjected to long-term floating charging. In view of this, we propose a BMS switching topology.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a BMS switching topology circuit to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a BMS switching topology circuit, the circuit includes B + end, B-end, P + end, P-end and control chip, B + end with P + end is located the both ends of a wire respectively, B-end with P-end is located the both ends of another wire respectively, it has discharge switch and charge switch to establish ties between B + end and the P + end, just control chip is used for controlling opening and shutting of discharge switch and charge switch, be connected with the group battery that is used for charging and discharging between B + end and the B-end, B + end with still be connected with between the P + end and be used for the DC power supply that the group battery charges.

Preferably, the circuit further comprises an equalization module for sampling the voltage of the control chip, and positive and negative terminals of the equalization module are respectively connected to the positive pole and the negative pole of the battery pack.

Preferably, discharge switch and charge switch are N type MOS pipe, just discharge switch 'S D utmost point is connected B + end, discharge switch' S the S utmost point with charge switch S utmost point is connected, charge switch D utmost point with P + end is connected, discharge switch 'S the G utmost point with control chip' S DSG wiring end is connected, charge switch 'S the G utmost point with control chip' S CHG wiring end is connected.

Preferably, a current detection resistor is connected between the B-terminal and the P-terminal, and two ends of the current detection resistor are connected with an OC terminal of the control chip.

Preferably, the battery pack is formed by connecting a plurality of storage batteries in series.

Compared with the prior art, the beneficial effects of the utility model are that: this BMS switch topology circuit utilizes two N type MOS pipes as the discharge switch and the charge switch of circuit, and two N type MOS pipes establish ties between B + end and P +, when heavy current (>50A) passes through, preferentially use DC/DC power to supply power to external load, the problem of shallow charging shallow discharging when having solved the battery and float and fill for a long time, other electronic component of circuit use in common negative pole, reduced noise interference and because MOS pipe opens the radiation and the conduction that closes and arouse and disturb, the cost is saved, the preparation is simple and convenient.

Drawings

Fig. 1 is a schematic diagram of the overall circuit of the present invention.

In the figure: 100. a B + terminal; 101. a DC/DC power supply; 102. a balancing module; 200. a B-terminal; 300. a P + terminal; 400. a P-terminal; 500. a control chip; 600. a discharge switch; 700. a charging switch; 800. a battery pack; 801. and (4) a storage battery.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1, the present invention provides a technical solution:

a BMS switch topology circuit comprises a B + terminal 100, a B-terminal 200, a P + terminal 300, a P-terminal 400 and a control chip 500, wherein the B + terminal 100 and the P + terminal 300 are respectively positioned at two ends of a lead, the B-terminal 200 and the P-terminal 400 are respectively positioned at two ends of another lead, a discharging switch 600 and a charging switch 700 are connected in series between the B + terminal 100 and the P + terminal 300, the control chip 500 is used for controlling the opening and closing of the discharging switch 600 and the charging switch 700, a battery pack 800 for charging and discharging is connected between the B + terminal 100 and the B-terminal 200, wherein the P + terminal 300 and the P-terminal 400 are used for connecting an external load, a DC/DC power supply 101 for charging the battery pack 800 is also connected between the B + terminal 100 and the P + terminal 300, the discharging switch 600 and the charging switch 700 are used as circuits by using two N-type MOS tubes, and the two N-type MOS tubes are connected in series between the B + terminal 100 and the P + terminal 300, when large current (>50A) passes through, the DC/DC power supply 101 is preferentially used for supplying power to an external load, so that the problem of shallow charging and shallow discharging when the battery is subjected to long-term floating charging is solved, other electronic elements of the circuit are used in common with the negative electrode, noise interference and radiation and conduction interference caused by the on and off of the MOS transistor are reduced, the cost is saved, and the manufacture is simple and convenient.

It should be noted that the circuit further includes an equalizing module 102 for sampling the voltage of the control chip 500, and the positive and negative terminals of the equalizing module 102 are respectively connected to the positive and negative terminals of the battery pack 800, the equalizing module 102 can make inconsistent voltage parameters consistent during the production and use of the battery pack 800, and the equalizing module 102 is a prior art, which can be implemented by those skilled in the art without needless to say, the present invention also does not relate to the improvement of the equalizing module 102.

Further, the discharging switch 600 and the charging switch 700 are both N-type MOS transistors, the D pole of the discharging switch 600 is connected to the B + terminal 100, the S pole of the discharging switch 600 is connected to the S pole of the charging switch 700, the D pole of the charging switch 700 is connected to the P + terminal 300, the G pole of the discharging switch 600 is connected to the DSG terminal of the control chip 500, and the G pole of the charging switch 700 is connected to the CHG terminal of the control chip 500.

In addition, a current detecting resistor is connected between the B-terminal 200 and the P-terminal 400, and both ends of the current detecting resistor are connected to the OC terminal of the control chip 500.

Specifically, the battery pack 800 is formed by connecting a plurality of storage batteries 801 in series, and is used for increasing the storage capacity of the battery pack 800 and prolonging the power supply time of the storage batteries 801.

It should be noted that the control chip 500 may be of the type SAMC21J18A, and its associated circuitry is provided by the manufacturer; furthermore, the utility model discloses well control chip's circuit and electronic components and module be prior art, and the field technical personnel can realize completely, need not beyond the great lines.

When the BMS switch topology circuit of this embodiment is in use, utilize two N type MOS pipes as discharge switch 600 and the charge switch 700 of circuit, and two N type MOS pipes are in series between B + end 100 and P +, when heavy current (>50A) passes through, preferentially use DC/DC power 101 to supply power to external load, the problem of shallow charging shallow discharging when having solved the battery and float for a long time is filled, other electronic component of circuit use negative pole altogether, noise interference and because the MOS pipe opens radiation and conduction interference that closes and arouse, and the cost is saved, and the preparation is simple and convenient.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A BMS switching topology circuit, the circuit comprising a B + terminal (100), a B-terminal (200), a P + terminal (300), a P-terminal (400) and a control chip (500), characterized in that: the battery pack charging system is characterized in that the B + end (100) and the P + end (300) are respectively located at two ends of one wire, the B-end (200) and the P-end (400) are respectively located at two ends of the other wire, a discharging switch (600) and a charging switch (700) are connected between the B + end (100) and the P + end (300) in series, the control chip (500) is used for controlling the opening and closing of the discharging switch (600) and the charging switch (700), a battery pack (800) used for charging and discharging is connected between the B + end (100) and the B-end (200), and a DC/DC power supply (101) used for charging the battery pack (800) is further connected between the B + end (100) and the P + end (300).

2. The BMS switching topology circuit of claim 1, wherein: the circuit further comprises an equalization module (102) used for sampling the voltage of the control chip (500), and the positive terminal and the negative terminal of the equalization module (102) are respectively connected to the positive pole and the negative pole of the battery pack (800).

3. The BMS switching topology circuit of claim 1, wherein: discharge switch (600) and charge switch (700) are N type MOS pipe, just the D utmost point of discharge switch (600) is connected B + end (100), the S utmost point of discharge switch (600) with charge switch (700) S utmost point is connected, charge switch (700) D utmost point with P + end (300) are connected, the G utmost point of discharge switch (600) with the DSG wiring end of control chip (500) is connected, the G utmost point of charge switch (700) with the CHG wiring end of control chip (500) is connected.

4. The BMS switching topology circuit of claim 1, wherein: a current detection resistor is connected between the B-terminal (200) and the P-terminal (400), and two ends of the current detection resistor are connected with an OC terminal of the control chip (500).

5. The BMS switching topology circuit of claim 1, wherein: and a filter is connected between the P + end (300) and the P-end (400).

6. The BMS switching topology circuit of claim 1, wherein: the battery pack (800) is formed by connecting a plurality of storage batteries (801) in series.