CN113937374B - Parallel battery pack and control method - Google Patents
Parallel battery pack and control method Download PDFInfo
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- CN113937374B CN113937374B CN202111160621.2A CN202111160621A CN113937374B CN 113937374 B CN113937374 B CN 113937374B CN 202111160621 A CN202111160621 A CN 202111160621A CN 113937374 B CN113937374 B CN 113937374B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005669 field effect Effects 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 14
- 238000007599 discharging Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
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- 238000012545 processing Methods 0.000 description 4
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- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/298—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the wiring of battery packs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/512—Connection only in parallel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
-
- 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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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The application discloses a parallel battery pack and a control method in the field of battery management, wherein the parallel battery pack comprises a battery pack shell; the battery pack shell is provided with a connecting socket and a battery management circuit board, and all the battery packs are connected in parallel through the connecting socket; the battery management circuit board comprises a micro control unit MCU; the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are electrically connected with the micro control unit MCU; the charge-discharge positive electrode interface PACK+ is electrically connected with the battery through a charge-discharge field effect transistor circuit; when the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are in a disconnection state, the micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from the battery; the phenomenon that a plurality of battery packs with different voltages are discharged and ignited when being connected in parallel can be avoided.
Description
Technical Field
The application belongs to the technical field of battery management, and particularly relates to a parallel battery pack and a control method.
Background
With the progress and development of society, the demands of adopting lithium batteries as clean energy sources in aspects of storage, home, travel and the like are increasing, the demands are different, and most importantly, the difference of the capacity demands of the batteries is the most important. In order to reduce repeated development, the conventional method is to directly connect a plurality of battery packs with the same voltage and capacity in parallel to improve the battery capacity, and the plurality of battery packs are coordinated and managed by adopting a CAN or 485 communication mode. However, this method not only requires one-to-one connection of the charge and discharge ports and the communication ports corresponding to each battery pack, but also requires manual measurement of the voltage of each battery pack before parallel connection. If the voltage difference among the battery packs is larger, the battery packs with higher voltage need to be manually discharged, and the equal voltage is reduced to be basically consistent with the voltage of other battery packs and then can be connected in parallel; otherwise, when the battery packs are connected in parallel, the phenomenon that the battery packs with higher voltage discharge and strike fire to the battery packs with lower voltage can occur, so that the operation is complex, and certain potential safety hazard exists.
Disclosure of Invention
The application aims to provide a parallel battery pack and a control method, which simplify the charge and discharge process of the battery pack and avoid discharging and igniting the battery pack with low voltage by the battery pack with higher voltage in the use process.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
in a first aspect, the present application provides a parallel battery pack comprising: a battery pack case; the battery pack shell is provided with a connecting socket and a battery management circuit board, and all the battery packs are connected in parallel through the connecting socket;
the connection socket is provided with a charge-discharge enabling positive electrode interface K+, a charge-discharge enabling negative electrode interface K-, a charge-discharge positive electrode interface PACK+ and a charge-discharge negative electrode interface PACK-; the battery management circuit board comprises a micro control unit MCU; the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are electrically connected with the micro control unit MCU; the charge-discharge positive electrode interface PACK+ is electrically connected with the battery through a charge-discharge field effect transistor circuit; when the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are in a disconnection state, the micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from the battery; when the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are in a connection state, the micro control unit MCU is connected with the charge-discharge positive electrode interface PACK+ and the battery.
Preferably, the micro control unit MCU of each battery pack is divided into a master controller and a slave controller, and one master controller is connected with a plurality of slave controllers; the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-which are connected with the main controller are electrically connected through a charge-discharge enabling switch.
Preferably, a charge-discharge enabling interface circuit is connected to a wake-up pin of the micro control unit MCU, and the charge-discharge enabling interface circuit comprises a PA port and a filter resistor R1; the wake-up pin, the PA port, the filter resistor R1 and the charge-discharge enabling positive electrode interface K+ of the micro control unit MCU are electrically connected in sequence; a first branch and a second branch are arranged on a circuit between the PA port and the filter resistor R1; the first branch is sequentially connected with a pull-up resistor R2 and an internal power supply VCC; and the second branch is connected with a filter capacitor C1 and connected with signal ground.
Preferably, the MCU is connected with the battery management analog front-end chip AFE; the battery management analog front end chip AFE is used for collecting voltage information, temperature information and current information of each battery cell.
Preferably, the battery pack is configured with a two-dimensional code tag for representing the identity information ID of the battery management circuit board.
Preferably, the connection socket is provided with an indicator lamp; the indicator lamp is connected with the MCU, and a three-color luminous tube is arranged in the indicator lamp; the micro control unit MCU converts the color of the indicator lamp according to the working state of the battery pack.
Preferably, the connection socket is provided with a first communication interface H and a first communication interface L, wherein the first communication interface H, the first communication interface L, a charge-discharge enabling positive electrode interface K+, a charge-discharge enabling negative electrode interface K-, a charge-discharge positive electrode interface PACK+ and a charge-discharge negative electrode interface PACK-are metal terminals with the same structure.
The metal terminal is provided with a main hole, a needle body matched with the main hole, a threading hole and a locking pin; the main hole is arranged on the upper surface of the battery pack; the needle body is opposite to the main hole and is arranged on the lower surface of the battery pack; the threading hole is arranged in parallel with the main hole; the locking pin is in threaded connection with the metal terminal, and one end of the locking pin extends into the threading hole.
Preferably, the battery packs are stacked; the needle body of the upper battery pack is inserted into the main hole of the lower battery pack.
Preferably, each battery pack is provided with an external connection socket; the pin body of the external connection socket is inserted into the main hole of the battery pack, and the external connection sockets are electrically connected.
In a second aspect, the present application provides a control method of a parallel battery pack,
the battery PACK is initially set into a low-power consumption standby mode, a charge-discharge enabling positive electrode interface K+ and a charge-discharge enabling negative electrode interface K-are in a disconnection state, and a micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from the battery; the battery packs are connected in parallel;
when the parallel battery PACK is used, the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are connected, the micro control unit MCU is activated to enter a normal working mode, and the micro control unit MCU controls the charge-discharge positive electrode interface PACK+ to be communicated with the battery;
when the parallel battery packs are charged, the battery pack with the lowest total voltage is firstly connected into charge; as the voltage of the battery pack increases, battery packs with the same voltage are sequentially connected to charge; finally, all the battery packs are charged together to realize parallel control;
when the parallel battery packs are discharged, the battery pack with the highest total voltage is firstly connected into charge; sequentially switching in battery packs with the same voltage for discharging along with the reduction of the voltage of the battery pack; and finally, the battery packs are discharged together to realize parallel control.
Compared with the prior art, the application has the beneficial effects that:
(1) The metal terminal is provided with a main hole and a needle body matched with the main hole; the main hole is arranged on the upper surface of the battery pack; the needle body is opposite to the main hole and is arranged on the lower surface of the battery pack; the battery packs are stacked; the needle body of the upper battery pack is inserted into the main hole of the lower battery pack; the connection mode is flexible to realize the parallel connection of a plurality of battery packs, and the operation of one-to-one wiring outside the battery packs can be avoided when a stacking mode is adopted.
(2) In the application, a battery PACK is initially set into a low-power consumption standby mode, a charge-discharge enabling positive electrode interface K+ and a charge-discharge enabling negative electrode interface K-are in a disconnection state, and a micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from a battery; the phenomenon that a plurality of battery packs with different voltages are discharged and ignited when being connected in parallel can be avoided.
(3) When the parallel battery packs are used, the battery packs with the same voltage are sequentially connected to charge and discharge; and finally, the battery packs are charged and discharged together to realize parallel control, so that the battery packs with higher voltage are prevented from discharging and igniting to the battery packs with lower voltage in the using process.
Drawings
Fig. 1 is a schematic structural view of a battery pack according to the present application;
fig. 2 is a schematic cross-sectional view of a metal terminal according to the present application;
FIG. 3 is a circuit diagram of a battery management circuit board provided by the present application;
fig. 4 is a schematic diagram of a first parallel connection structure of a battery pack according to the present application;
fig. 5 is a schematic diagram of a parallel connection structure of a second battery pack according to the present application;
fig. 6 is a schematic flow chart of a control method of a parallel battery pack according to the present application.
In the figure: the battery pack comprises a battery pack shell 1, a connecting socket 2, an indicator lamp 3, a battery management circuit board 4, a charge and discharge enabling interface circuit 41, an indicator lamp driving circuit 42, a charge and discharge field effect transistor circuit 43, a two-dimensional code tag 44, a metal terminal 5, a main hole 51, a needle body 52, a threading hole 53, a locking pin 54 and a charge and discharge enabling switch 6.
Description of the embodiments
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
Examples
As shown in fig. 1-6, a parallel battery pack and a control method, comprising:
a parallel battery pack comprising: a battery pack case 1; the battery pack shell 1 is provided with a connecting socket 2 and a battery management circuit board 4, and all the battery packs are connected in parallel through the connecting socket 2;
the connection socket 2 is provided with a charge-discharge enabling positive electrode interface K+, a charge-discharge enabling negative electrode interface K-, a charge-discharge positive electrode interface PACK+ and a charge-discharge negative electrode interface PACK-; the battery management circuit board 4 comprises a micro control unit MCU; the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are electrically connected to the micro control unit MCU through the charge-discharge enabling interface circuit 41; the charge-discharge positive electrode interface pack+ is electrically connected with the battery through a charge-discharge field effect transistor circuit 43, and the charge-discharge field effect transistor circuit 43 comprises: a charging MOS tube Q1 and a discharging MOS tube Q2, which are both field effect tubes with P channels; when the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are in a disconnection state, the micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from the battery; when the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are in a connection state, the micro control unit MCU is connected with the charge-discharge positive electrode interface PACK+ and the battery, and in a non-working state, voltage at the PACK+ end can be avoided as long as the charge-discharge tube is disconnected, and electric shock hidden danger in the process of carrying and the like is reduced.
The micro control unit MCU and the battery management analog front end chip AFE generally adopt an I2C bus to exchange information; the battery management analog front end chip AFE is used for collecting voltage information, temperature information and current information of each battery cell; the battery pack is provided with a two-dimensional code tag 44 for representing the identity information ID of the battery management circuit board; an indicator lamp 3 is arranged on the connecting socket 2; the indicator lamp 3 is connected with the MCU through an indicator lamp driving circuit 42, the indicator lamp driving circuit 42 is provided with a driving triode Q3, and a three-color luminous tube is arranged in the indicator lamp 3; the micro control unit MCU converts the color of the indicator lamp according to the working state of the battery pack.
The micro control unit MCU of each battery pack is divided into a master controller and slave controllers, the micro control unit MCU of the pool management circuit board for setting the minimum identity information ID is taken as the master controller, the other micro control units MCU are slave controllers, and one master controller is connected with a plurality of slave controllers; the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-which are connected with the main controller are electrically connected through the charge-discharge enabling switch 6; the main controller periodically broadcasts the CAN message, and the other slave controllers respond and send the ID number of the main controller, the state information of the charge-discharge MOS tube switch state, voltage, current, temperature, fault and the like of the battery pack after receiving the CAN message. After receiving all the information, the master control board controls the access working state of each slave control board; the slave control board listens to the instruction of the master control board to work.
A charge-discharge enabling interface circuit is connected to a wake-up pin of the micro control unit MCU, and comprises a PA port and a filter resistor R1; the wake-up pin, the PA port, the filter resistor R1 and the charge-discharge enabling positive electrode interface K+ of the micro control unit MCU are electrically connected in sequence; a first branch and a second branch are arranged on a circuit between the PA port and the filter resistor R1; the first branch is sequentially connected with a pull-up resistor R2 and an internal power supply VCC; and the second branch is connected with a filter capacitor C1 and connected with signal ground.
The connecting socket 2 is provided with a first communication interface H and a first communication interface L, wherein the first communication interface H, the first communication interface L, a charge-discharge enabling positive electrode interface K+, a charge-discharge enabling negative electrode interface K-, a charge-discharge positive electrode interface PACK+ and a charge-discharge negative electrode interface PACK-are metal terminals 5 with the same structure; the first communication interface H, the first communication interface L and the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are small-sized metal terminals; the charge-discharge positive electrode interface PACK+ and the charge-discharge negative electrode interface PACK-are large-scale metal terminals; the small metal terminals and the large metal terminals are distributed in a staggered manner.
The metal terminal 5 is provided with a main hole 51, a needle body 52 matched with the main hole, a threading hole 53 and a locking pin 54; the main hole 51 is of a torsion spring structure and is provided with a guide conical surface; the needle 52 is of solid construction and is exposed outside the socket; the main hole 51 is formed on the upper surface of the battery pack; the needle 52 is opposite to the main hole 51 and is arranged on the lower surface of the battery pack; the threading hole 53 is arranged in parallel with the main hole 51; the locking pin 54 is in threaded connection with the metal terminal 5, and one end of the locking pin 54 extends into the threading hole 53.
The connection mode among the battery packs comprises a stacking connection mode and an external connection mode; as shown in fig. 5, the stacking connection manner is as follows: the battery packs are stacked, the needle body of the upper battery pack is inserted into the main hole of the lower battery pack, the connection mode is flexible to realize the parallel connection of a plurality of battery packs, and the operation of one-to-one wiring outside the battery packs can be avoided when the stacking mode is adopted; as shown in fig. 4, the external connection mode is as follows: each battery pack is provided with an external connection socket; the pin body of the external connection socket is inserted into the main hole of the battery pack, and the external connection sockets are electrically connected.
Examples
As shown in fig. 3 to 6, a control method of a parallel battery pack includes
The battery PACK is initially set into a low-power consumption standby mode, a charge-discharge enabling positive electrode interface K+ and a charge-discharge enabling negative electrode interface K-are in a disconnection state, and a micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from the battery; the battery packs are connected in parallel, so that the phenomenon of discharging and igniting when a plurality of battery packs with different voltages are connected in parallel can be avoided
The main controller periodically broadcasts the CAN message, and the other slave controllers respond and send the ID number of the main controller, the state information of the charge-discharge MOS tube switch state, voltage, current, temperature, fault and the like of the battery pack after receiving the CAN message. After receiving all the information, the master control board controls the access working state of each slave control board; the slave control board listens to the instruction of the master control board to work;
when the parallel battery PACK is used, the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are connected, the micro control unit MCU is activated to enter a normal working mode, and the micro control unit MCU controls the charge-discharge positive electrode interface PACK+ to be communicated with the battery;
when the parallel battery packs are charged, the battery pack with the lowest total voltage is firstly connected into charge; as the voltage of the battery pack increases, battery packs with the same voltage are sequentially connected to charge; finally, all the battery packs are charged together to realize parallel control;
when the parallel battery packs are discharged, the battery pack with the highest total voltage is firstly connected into charge; sequentially switching in battery packs with the same voltage for discharging along with the reduction of the voltage of the battery pack; finally, all the battery packs are discharged together to realize parallel control; the battery pack with higher voltage is prevented from discharging and igniting to the battery pack with lower voltage in the using process.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present application, and such modifications and variations should also be regarded as being within the scope of the application.
Claims (7)
1. A parallel battery pack, comprising: a battery pack case; the battery pack shell is provided with a connecting socket and a battery management circuit board, and all the battery packs are connected in parallel through the connecting socket;
the connection socket is provided with a charge-discharge enabling positive electrode interface K+, a charge-discharge enabling negative electrode interface K-, a charge-discharge positive electrode interface PACK+ and a charge-discharge negative electrode interface PACK-; the battery management circuit board comprises a micro control unit MCU; the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are electrically connected with the micro control unit MCU; the charge-discharge positive electrode interface PACK+ is electrically connected with the battery through a charge-discharge field effect transistor circuit; when the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are in a disconnection state, the micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from the battery; when the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are in a connection state, the micro control unit MCU is connected with the charge-discharge positive electrode interface PACK+ and the battery;
the first communication interface H, the first communication interface L, the charge-discharge enabling positive electrode interface K+, the charge-discharge enabling negative electrode interface K-, the charge-discharge positive electrode interface PACK+ and the charge-discharge negative electrode interface PACK-are metal terminals with the same structure;
the metal terminal is provided with a main hole, a needle body matched with the main hole, a threading hole and a locking pin; the main hole is arranged on the upper surface of the battery pack; the needle body is opposite to the main hole and is arranged on the lower surface of the battery pack; the threading hole is arranged in parallel with the main hole; the locking pin is in threaded connection with the metal terminal, and one end of the locking pin extends into the threading hole;
the battery packs are stacked, and the needle body of the upper battery pack is inserted into the main hole of the lower battery pack; or, each battery pack is provided with an external connection socket, and the pin body of the external connection socket is inserted into the main hole of the battery pack, and the external connection sockets are electrically connected.
2. The parallel battery pack according to claim 1, wherein the micro control unit MCU of each battery pack is divided into a master controller and a slave controller, and one master controller is connected with a plurality of slave controllers; the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-which are connected with the main controller are electrically connected through a charge-discharge enabling switch.
3. The parallel battery pack according to claim 1, wherein a wake-up pin of the micro control unit MCU is connected with a charge-discharge enabling interface circuit, and the charge-discharge enabling interface circuit comprises a PA port and a filter resistor R1; the wake-up pin, the PA port, the filter resistor R1 and the charge-discharge enabling positive electrode interface K+ of the micro control unit MCU are electrically connected in sequence; a first branch and a second branch are arranged on a circuit between the PA port and the filter resistor R1; the first branch is sequentially connected with a pull-up resistor R2 and an internal power supply VCC; and the second branch is connected with a filter capacitor C1 and connected with signal ground.
4. The parallel battery pack according to claim 1, wherein the micro control unit MCU is connected to a battery management analog front end chip AFE; the battery management analog front end chip AFE is used for collecting voltage information, temperature information and current information of each battery cell.
5. The parallel battery pack of claim 1, wherein the battery pack is configured with a two-dimensional code tag for characterizing battery management circuit board identity information ID.
6. The parallel battery pack according to claim 1, wherein the connection socket is provided with an indicator light; the indicator lamp is connected with the MCU, and a three-color luminous tube is arranged in the indicator lamp; the micro control unit MCU converts the color of the indicator lamp according to the working state of the battery pack.
7. The control method of the parallel battery pack according to any one of claims 1 to 6, comprising:
the battery PACK is initially set into a low-power consumption standby mode, a charge-discharge enabling positive electrode interface K+ and a charge-discharge enabling negative electrode interface K-are in a disconnection state, and a micro control unit MCU disconnects the charge-discharge positive electrode interface PACK+ from the battery; the battery packs are connected in parallel;
when the parallel battery PACK is used, the charge-discharge enabling positive electrode interface K+ and the charge-discharge enabling negative electrode interface K-are connected, the micro control unit MCU is activated to enter a normal working mode, and the micro control unit MCU controls the charge-discharge positive electrode interface PACK+ to be communicated with the battery;
when the parallel battery packs are charged, the battery pack with the lowest total voltage is firstly connected into charge; as the voltage of the battery pack increases, battery packs with the same voltage are sequentially connected to charge; finally, all the battery packs are charged together to realize parallel control;
when the parallel battery packs are discharged, the battery pack with the highest total voltage is firstly connected into charge; sequentially switching in battery packs with the same voltage for discharging along with the reduction of the voltage of the battery pack; and finally, the battery packs are discharged together to realize parallel control.
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