CN114598004A - Battery module management circuit for isolated communication control - Google Patents

Battery module management circuit for isolated communication control Download PDF

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Publication number
CN114598004A
CN114598004A CN202210275319.XA CN202210275319A CN114598004A CN 114598004 A CN114598004 A CN 114598004A CN 202210275319 A CN202210275319 A CN 202210275319A CN 114598004 A CN114598004 A CN 114598004A
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CN
China
Prior art keywords
battery
battery module
circuit
control switch
main
Prior art date
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Pending
Application number
CN202210275319.XA
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Chinese (zh)
Inventor
郑恩爱
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Fujian Eurasia Shengdi Industrial Co ltd
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Fujian Eurasia Shengdi Industrial Co ltd
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Application filed by Fujian Eurasia Shengdi Industrial Co ltd filed Critical Fujian Eurasia Shengdi Industrial Co ltd
Priority to CN202210275319.XA priority Critical patent/CN114598004A/en
Publication of CN114598004A publication Critical patent/CN114598004A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00302—Overcharge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The invention provides a battery module management circuit for isolated communication control, which comprises a battery module, wherein the battery module comprises at least two battery packs connected in series, each battery pack comprises a main circuit and a bypass connected to the main circuit in parallel, a plurality of battery monomers and a main control switch are connected to the main circuit in series, a bypass control switch is electrically connected to the bypass, the main control switch and the bypass control switch are connected to a driving circuit, the battery module management circuit also comprises a battery parameter detection circuit, the battery parameter detection circuit is in communication connection with a battery module controller, the battery module controller is in communication connection with the driving circuit, and the battery module controller is in communication connection with the main controller through an isolated communication chip. The battery packs of the invention are all provided with independent control protection units, and independent control is realized through the main control switch and the side control switch, when one battery pack is overcharged or overdischarged, the main control switch can be switched off, and the side control switch can be switched on, so that the charging and discharging of other battery packs are not influenced, and the battery packs can be adjusted in various states and independently protected.

Description

Battery module management circuit for isolated communication control
Technical Field
The invention relates to the technical field of battery management systems, in particular to a battery module management circuit for isolated communication control.
Background
In power battery pack and energy storage battery pack products, the power supply of many existing products is supplied by a lithium ion battery or a battery pack, and the lithium ion battery often needs a protection circuit in order to ensure the use safety and the service life of the lithium ion battery pack and avoid the over-discharge or over-charge of the battery. In the lithium ion battery module with a protection function in the market, the output circuit is disconnected for protection during the protection operation, and a field effect transistor with low on-resistance and a withstand voltage value lower than 100V is generally used as a power transistor for controlling the output circuit. In a high-voltage power battery or an energy storage battery with the voltage reaching hundreds of volts or even thousands of volts, a mode of serially combining a plurality of battery modules is often adopted, when the total voltage of a battery pack after serial connection is very high (for example, 10 48V lithium ion battery modules with protection functions commonly used in the energy storage industry are serially connected into 480V for use), if a protection switch is serially connected onto a module output loop, the battery module breaks the serial protection switch in the module due to some reason in the use process, and an MOSFET (metal-oxide-semiconductor field effect transistor) serving as a control switch can bear the withstand voltage value exceeding hundreds of volts or even thousands of volts and possibly cause breakdown, so that the protection function of the battery module fails; if the battery pack in one of the battery modules is disconnected from the output circuit due to overcharge protection during use, other battery packs in the battery modules cannot be charged even if the other battery packs are not fully charged due to the cut-off of the charging circuit, so that the battery packs cannot be fully charged; if the battery pack in one of the battery modules is over-discharged during use, the total discharge loop is cut off, so that some battery packs in the battery modules have redundant electric quantity and cannot be used. Therefore, when the power battery or the energy storage battery has a high voltage (for example, more than 500V) output, a scheme for connecting a plurality of lithium ion battery modules with individual protection functions in series to form a battery pack for use does not exist in the market, and the existing scheme in the market can only connect a plurality of battery packs without individual protection functions in series to perform overall protection control, but cannot perform independent protection control on each battery pack.
Disclosure of Invention
The invention provides a battery module management circuit for isolated communication control, which solves the defects that one battery pack in a battery module in the market is disconnected with an output circuit due to overcharge protection, other battery packs in the battery module cannot be charged even if the other battery packs are not fully charged due to the cut-off of a charging circuit, and one battery pack in the battery module is over-discharged, so that the total discharging circuit is cut off, and some battery packs in the battery module have redundant electric quantity and cannot be used.
The technical scheme of the invention is realized as follows:
keep apart communication control's battery module management circuit, including battery module, battery module includes the group battery of two at least series connections, the group battery includes the main circuit and connects the bypass on the main circuit in parallel, a plurality of battery monomer and master control switch have concatenated on the main circuit, the electrical connection has other accuse switch on the bypass, master control switch and other accuse switch are connected with drive circuit, still including the battery parameter detection circuit that is used for detecting the free electric current of battery and voltage and detects the group battery temperature, battery parameter detection circuit and every battery monomer series connection node electrical connection, battery parameter detection circuit and battery module controller communication connection, battery module controller and drive circuit communication connection, battery module controller passes through the break-make of drive circuit control master control switch and other accuse switch, battery module controller passes through isolation communication chip and master control unit communication connection.
As a further technical scheme, a fuse is also connected in series on the main circuit.
As a further technical scheme, the main control switch and the side control switch are both MOS tubes, the driving circuit is an MOS tube driving circuit, and a G pole of the MOS tube is connected with the MOS tube driving circuit.
As a further technical scheme, the battery module controller is a single chip microcomputer, and the single chip microcomputer is connected with the MOS tube driving circuit.
As a further technical scheme, the MOS tube is an N-channel MOS tube or a P-channel MOS tube.
As a further technical scheme, the number of the battery packs is two.
As a further technical scheme, 2-12 battery cells are connected in series in each battery pack.
As a further technical scheme, the main controller is a single chip microcomputer or a PLC.
The invention has the beneficial effects that:
the battery packs of the invention are all provided with independent control protection units, independent control is realized through the main control switch and the side control switch, when one battery pack is overcharged or overdischarged, the main control switch can be disconnected, the side control switch can be closed, the charging and discharging of other battery packs are not influenced, for example, two battery packs are connected in series in one battery module, each battery pack is formed by connecting 5 battery monomers in series, the main controller controls the output state of the battery pack through isolated communication, and the battery pack has four output states, namely, the output state of the series connection of the battery monomers of two battery packs 10, the output state of the series connection of the battery monomers of high 5 battery packs, the output state of the series connection of the battery monomers of low 5 battery packs and the bypass conduction output state, and each battery pack has a protection function and is practical and capable of regulating and independently protecting multiple states.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, the battery module management circuit for isolated communication control includes a battery module, the battery module includes at least two battery packs connected in series, the battery packs include a main circuit 1 and a bypass 2 connected in parallel to the main circuit 1, a plurality of battery cells 11 and a main control switch 12 are connected in series to the main circuit 1, the bypass 2 is electrically connected to a bypass control switch 21, the main control switch 12 and the bypass control switch 21 are connected to a driving circuit 3, the battery module management circuit further includes a battery parameter detection circuit 4 for detecting current and voltage of the battery cells 11 and detecting temperature of the battery packs, the battery parameter detection circuit 4 is electrically connected to each series node of the battery cells 11, the battery parameter detection circuit 4 is in communication connection with a battery module controller 5, the battery module controller 5 is in communication connection with the driving circuit 3, the battery module controller 5 controls the on-off of the main control switch 12 and the bypass control switch 21 through the driving circuit 3, the battery module controller 5 is in communication connection with the main controller 7 through the isolated communication chip 6.
As a further technical scheme, a fuse 13 is also connected in series on the main circuit 1, and the fuse 13 plays a role in fusing protection to achieve a double protection effect.
As a further technical solution, the main control switch 12 and the side control switch 21 are both MOS transistors, the driving circuit 3 is an MOS transistor driving circuit, and a G pole of the MOS transistor is connected to the MOS transistor driving circuit.
As a further technical scheme, the battery module controller 5 is a single chip microcomputer, and the single chip microcomputer is connected with the MOS tube driving circuit.
As a further technical scheme, the MOS tube is an N-channel MOS tube or a P-channel MOS tube.
As a further technical scheme, the number of the battery packs is two.
As a further technical solution, each battery pack has 5 battery cells connected in series, or 2 to 12 battery cells.
As a further technical scheme, the main controller 7 is a single chip microcomputer or a PLC.
The communication interface of the main controller 7 is connected with the communication interface of the isolation communication chip 6, the main controller 7 sends a control signal to the isolation communication chip 6, the other communication interface of the isolation communication chip 6 is connected with the battery module controller 5 and used for sending the control signal of the main controller 7 to the battery module controller 5, then the interface of the battery module controller 5 is connected with the driving circuit 3, the main switch 12 and the side switch 21 are controlled to be disconnected and closed through the driving circuit 3, and the communication interface of the battery module controller 5 is connected with the interface of the battery parameter detection circuit 4 and used for obtaining the parameters of the battery.
The battery parameter detecting circuit can be implemented by typical application circuits of Analog Front End (AFE) chips of lithium ion batteries, such as LTC6804 of Linear Technology, BQ76930 of TI, MC33771 of NXP (the specific circuits are omitted here because they are all in the data book of each chip), which are connected with each battery cell and connected with NTC (negative temperature coefficient thermistor), and can detect the voltage, current and temperature of each battery cell in the battery pack; the analog front end AFE is connected with a communication interface (the communication interface can be an IIC interface, an SPI interface or a UART interface and the like) of the single chip microcomputer for communication through the IIC interface or the SPI interface.
The battery packs of the invention are all provided with independent control protection units, independent control is realized through the main control switch 12 and the side control switch 21, when one battery pack is over-charged or over-discharged, the main control switch 12 can be disconnected, the side control switch 21 can be closed, the charging and discharging of other battery packs are not influenced, two battery packs are connected in series in a battery module, each battery pack is formed by connecting 5 battery monomers in series, the main controller 7 sends a control signal to the battery module controller 5 through the isolation communication chip 6, the battery module controller 5 controls the main control switch 12 and the side control switch 21 through the driving circuit 3 to realize the control of the output state of the battery pack, and the battery pack can have several output states, namely, the output state of the two battery packs 10 in series connection with the battery monomers, the output state of the high-5 battery monomers in series connection with the battery monomers and the output state of the low-5 battery monomers in series connection with the battery monomers, The bypass switches on the output state, and each battery pack has a protection function, and is practical and capable of being adjusted in multiple states and independently protected.
The specific control mode and working state of the battery module are as follows:
Figure BDA0003555497570000051
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. Keep apart communication control's battery module management circuit, its characterized in that: the battery pack comprises a battery module, the battery module comprises at least two battery packs connected in series, the battery packs comprise a main circuit and a bypass connected to the main circuit in parallel, a plurality of battery monomers and a main control switch are connected to the main circuit in series, the bypass is electrically connected with a side control switch, the main control switch and the side control switch are connected with a driving circuit, the battery pack further comprises a battery parameter detection circuit used for detecting the current and the voltage of the battery monomers and detecting the temperature of the battery packs, the battery parameter detection circuit is electrically connected with each battery monomer series node, the battery parameter detection circuit is in communication connection with a battery module controller, the battery module controller is in communication connection with the driving circuit, the battery module controller controls the on-off of the main control switch and the side control switch through the driving circuit, and the battery module controller is in communication connection with the main controller through an isolation communication chip.
2. The isolated communication controlled battery module management circuit of claim 1, wherein: and a fuse is also connected in series on the main circuit.
3. The isolated communication controlled battery module management circuit of claim 1, wherein: the main control switch and the side control switch are both MOS tubes, the driving circuit is an MOS tube driving circuit, and the G pole of the MOS tube is connected with the MOS tube driving circuit.
4. The isolated communication controlled battery module management circuit of claim 3, wherein: the battery module controller is a single chip microcomputer, and the single chip microcomputer is connected with the MOS tube driving circuit.
5. The isolated communication controlled battery module management circuit of claim 3 or 4, wherein: the MOS tube is an N-channel MOS tube or a P-channel MOS tube.
6. The isolated communication controlled battery module management circuit of claim 1, wherein: the number of the battery packs is two.
7. The isolated communication controlled battery module management circuit of claim 1, wherein: the number of the battery cells connected in series in each battery pack is 2-12.
8. The isolated communication controlled battery module management circuit of claim 1, wherein: the main controller is a single chip microcomputer or a PLC.
CN202210275319.XA 2022-03-21 2022-03-21 Battery module management circuit for isolated communication control Pending CN114598004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210275319.XA CN114598004A (en) 2022-03-21 2022-03-21 Battery module management circuit for isolated communication control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210275319.XA CN114598004A (en) 2022-03-21 2022-03-21 Battery module management circuit for isolated communication control

Publications (1)

Publication Number Publication Date
CN114598004A true CN114598004A (en) 2022-06-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN114598004A (en)

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