A method for connecting a lithium battery pack of an electric motorcycle in series and using it as an independent single pack

Abstract

The present invention discloses a method for serial networking of lithium battery packs for electric motorcycles and independent single-pack use. The dual-pack serial system comprises a first battery barrel and a second battery barrel connected in series on a whole vehicle, wherein the first battery barrel and the second battery barrel are respectively provided with a first battery pack and a second battery pack, wherein the first battery pack and the second battery pack are both non-identity pack battery packs when not placed in the barrels and cannot be charged or discharged; the single-pack system comprises a third battery barrel connected to the whole vehicle, wherein the third battery barrel is provided with a third battery pack, wherein the third battery pack is a non-identity pack battery pack when not placed in the barrel and cannot be charged or discharged; the method for serial networking of lithium battery packs for electric motorcycles provided by the present invention doubles the discharge power through serial discharge, and the vehicle accelerates faster and has stronger maneuverability; the method of use is flexible, and serial networking or independent single-pack use is adaptable to more vehicle models.

Description

Technical Field

[0001] The invention relates to a method for connecting a lithium battery pack of an electric motorcycle in series and networking it, and using it as an independent single pack, and belongs to the technical field of portable battery packs. Background Art

[0002] Currently, most electric motorcycle lithium battery packs are used independently. The existing technology has the following problems and disadvantages:

[0003] 1. The product has a high degree of customization, which occupies a large amount of R&D and design resources. Different single-package products need to be designed according to the different vehicle voltage platforms of customers;

[0004] 2. The product usage scenario is single, and battery packs with different string numbers / voltage platforms cannot be used interchangeably. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for connecting an electric motorcycle lithium battery pack in series and using the battery pack independently to solve the following problems:

[0006] 1. Identity identification and conversion of master pack / slave pack / single pack / non-identity battery pack;

[0007] 2. Dual-packet serial networking / network exit strategy;

[0008] 3. Double pack power balance control.

[0009] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0010] In a first aspect, the present invention provides a method for using a lithium battery pack in series for an electric motorcycle, which is applied to a dual-pack series system, wherein the dual-pack series system includes a first battery seat barrel and a second battery seat barrel connected in series on a whole vehicle, wherein the first battery seat barrel and the second battery seat barrel are respectively provided with a first battery pack and a second battery pack, wherein the first battery pack and the second battery pack are both non-identity pack battery packs when not placed in the seat barrels and cannot be charged or discharged, and the method includes:

[0011] The first battery pack is placed in the first battery holder barrel. After the first battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, its identity is converted to the main pack.

[0012] The second battery pack is placed in the second battery holder barrel. After the second battery pack is awakened by the master pack communication, its identity is converted to a slave pack.

[0013] The main package controls the charging and discharging process;

[0014] The master pack monitors the vehicle's KEY signal and the charger's C_IN signal in real time. When both signals are disabled, the master pack and the slave pack enter sleep mode respectively, and their identities are restored to battery packs without identity packs.

[0015] Furthermore, the first battery pack is placed in the first battery holder barrel, and after the first battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, its identity is converted to a main pack, including:

[0016] Put the first battery pack into the first battery holder, and enable and wake up the first battery pack in the first battery holder by the vehicle KEY signal or the charger C_IN signal;

[0017] The first battery pack detects the KEY signal or the C_IN signal and the ID1 signal, and is identified as the main pack.

[0018] Furthermore, the second battery pack is placed in the second battery holder barrel, and after the second battery pack is awakened by the master pack communication, its identity is converted to a slave pack, including:

[0019] The second battery pack is placed in the second battery holder barrel, and the master pack sends a slave pack control message to the second battery pack in the second battery holder barrel via CAN bus communication;

[0020] The second battery pack is awakened by the slave pack control message sent by the master pack, detects ID2 and the slave pack control message sent by the master pack, and is identified as a slave pack.

[0021] Furthermore, the main package controls the charging and discharging process, including:

[0022] The master packet periodically sends a slave packet control message to the slave packet, wherein the slave packet replies to the slave packet control message sent by the master packet periodically, and the charging and discharging is controlled by the master packet;

[0023] The master package receives the message uploaded by the slave package, summarizes the battery cell data and the working status of the protection board of the two packages, and forms a battery management system. The host is responsible for managing the charging and discharging process and communicating with the outside world.

[0024] Furthermore, the master pack monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the master pack and the slave pack enter sleep mode respectively, and the identities are restored to battery packs without identity packs, including:

[0025] The master package monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the master package controls the slave package to disconnect the charging and discharging MOS and terminate the charging and discharging process.

[0026] The master package stops sending slave package control messages, enters a dormant state, and restores its identity to a battery package without an identity, waiting to be awakened next time;

[0027] The slave package monitors and receives the slave package control message sent by the master package in real time. When the master package stops sending the slave package control message, the slave package delays entering the sleep state and its identity is restored to a battery package without identity, waiting to be awakened next time.

[0028] In a second aspect, the present invention provides a method for using an electric motorcycle lithium battery pack independently, which is applied to a single pack system, wherein the single pack system includes a third battery seat bucket connected to the whole vehicle, and the third battery seat bucket is provided with a third battery pack, wherein the third battery pack is a non-identity pack battery pack when not placed in the seat bucket, and cannot be charged or discharged, and the third seat bucket contains a vehicle KEY signal or a charger C_IN signal terminal, but does not contain an ID1 / ID2 terminal; the method includes:

[0029] Put the third battery pack into the third battery holder barrel. After the third battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, its identity is converted to a single pack.

[0030] Single pack controls the charging and discharging process;

[0031] The single pack monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the single pack goes into sleep mode and its identity is restored to that of a battery pack without an identity pack.

[0032] Furthermore, the third battery pack is placed in the third battery holder barrel, and after the third battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, the identity is converted to a single pack, including:

[0033] Put the third battery pack into the third battery holder, and the vehicle KEY signal or the charger C_IN signal enables and wakes up the third battery pack in the third battery holder;

[0034] The third battery pack detects the KEY signal or C_IN signal but does not detect the ID1 and ID2 signals, and is identified as a single pack.

[0035] Furthermore, the single-packet control charging and discharging process includes: the single packet sends data according to the whole vehicle protocol and controls the charging and discharging.

[0036] Furthermore, the single pack monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the single pack goes into sleep mode and its identity is restored to a battery pack without an identity pack, including:

[0037] A single package monitors the vehicle's KEY signal and the charger's C_IN signal in real time, and stops charging and discharging when both signals are disabled;

[0038] When a single pack continuously monitors the vehicle's KEY signal and the charger's C_IN signal to be disabled, it enters a dormant state and its identity is restored to a battery pack with no identity, waiting to be awakened next time.

[0039] In a third aspect, the present invention provides a dual-packet power balancing control method applied to the aforementioned dual-packet series system, comprising:

[0040] When battery packs with inconsistent power levels are networked, if the SOC difference is greater than 30%, network charging is allowed but discharging is prohibited;

[0041] The main pack power indicator panel uses a specific LED animation to remind customers that the power difference between the two packs is too large and needs to be charged for equalization;

[0042] During the charging process, the battery pack with higher power is discharged as a whole group through the balancing module in the battery pack, where the balancing module is controlled by PWM output;

[0043] When the power of the master package and the slave package is less than 3%, the balancing module stops working.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. Improve mobility and increase mileage:

[0046] Series discharge doubles the discharge power, making the vehicle accelerate faster and more maneuverable;

[0047] The series system has a higher storage capacity, which increases the vehicle's range;

[0048] 2. Flexible usage, series networking or single package independent, adaptable to more models:

[0049] Two single packs can be connected in series through software adaptive networking, which is suitable for high voltage / high power models;

[0050] Single packs can also be used for low voltage / small and medium power models;

[0051] No additional operation or configuration is required during use, the battery pack can automatically identify its identity and perform corresponding control;

[0052] 3. Standardized design to reduce design and material costs:

[0053] The products can be produced in a standardized manner to meet the requirements of both 48V and 96V systems without repeated design.

[0054] Standardized design facilitates product realization and material procurement, reducing material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a vehicle wiring diagram of a double-pack series system provided by an embodiment of the present invention;

[0056] Figure 2 It is a whole vehicle wiring diagram of a single package system provided by an embodiment of the present invention;

[0057] Figure 3 It is a schematic diagram of the identity recognition and switching state machine provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0059] Example 1

[0060] This embodiment introduces a method for using a lithium battery pack in series for an electric motorcycle, which is applied to a dual-pack series system. The dual-pack series system includes a first battery seat barrel and a second battery seat barrel connected in series on the whole vehicle. The first battery seat barrel and the second battery seat barrel are respectively provided with a first battery pack and a second battery pack. When the first battery pack and the second battery pack are not placed in the seat barrel, they are both non-identity pack battery packs and cannot be charged or discharged. The method includes:

[0061] The first battery pack is placed in the first battery holder barrel. After the first battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, its identity is converted to the main pack.

[0062] The second battery pack is placed in the second battery holder barrel. After the second battery pack is awakened by the master pack communication, its identity is converted to a slave pack.

[0063] The main package controls the charging and discharging process;

[0064] The master pack monitors the vehicle's KEY signal and the charger's C_IN signal in real time. When both signals are disabled, the master pack and the slave pack enter sleep mode respectively, and their identities are restored to battery packs without identity packs.

[0065] Connector Pin Design

[0066] 1) Brief introduction of the seat bucket connector pin, see Figure 1 :

[0067] P+: positive output of battery pack;

[0068] P-: negative pole of battery pack output;

[0069] ID1: short-circuited to GND in the 1# seat bucket, used for main package identity confirmation;

[0070] ID2: Short-circuited to GND in the 2# seat barrel, used for slave package identity confirmation;

[0071] KEY: The whole vehicle is connected to the 1# seat bucket, which is used for the main bag to detect the key signal;

[0072] C_IN: The vehicle charger interface is connected to the 1# seat bucket, which is used for the main package detection charger access;

[0073] CAN_H: CAN communication bus high signal;

[0074] CAN_L: CAN communication bus low signal;

[0075] GND: CAN communication bus ground;

[0076] SOC: Main packet output signal.

[0077] 2) Usage of pins of battery pack holders with different identities (√ used, × not used):

[0078] Pin Definition Main Package From the package Single Pack P+ √ √ √ P- √ √ √ ID1 √ × × ID2 × √ × KEY √ × √ C_IN √ × √ CAN_H √ √ √ CAN_L √ √ √ GND √ √ √ SOC √ × √

[0079] 3) Battery pack identity and pin signal truth table (√ has signal, × has no signal, - does not matter):

[0080]

[0081] 2. Battery pack identity determination method, see Figure 3 :

[0082] A) No identity package → main package

[0083] The battery pack is awakened after dormancy. When ID1 is detected, the C_IN signal or KEY signal is detected for 1 second.

[0084] B) Main package → No identity package

[0085] The master packet does not detect ID1, C_IN and KEY signals for 2 seconds.

[0086] A) No identity package → from package

[0087] The battery pack is awakened after hibernation, and ID2 is detected for 1 second and the host is online;

[0088] B) From package → no identity package

[0089] The slave packet does not detect ID2 for 2 seconds and the host is offline.

[0090] A) No identity package → single package

[0091] The battery pack is awakened after hibernation. If ID1 and ID2 are not detected, the C_IN signal or KEY signal is detected for 1 second.

[0092] B) Single package → No identity package

[0093] A single packet fails to detect ID1, ID2, C_IN and KEY signals for 2 seconds.

[0094] The method for using the electric motorcycle lithium battery pack in series networking provided in this embodiment specifically involves the following steps:

[0095] 1. Place any two battery packs 1# and 2# in the 1# and 2# battery buckets of the electric motorcycle respectively;

[0096] 2. The vehicle KEY signal or the charger C_IN signal enables and wakes up the 1# battery pack in the 1# bucket;

[0097] 3.1# battery pack detects KEY signal or C_IN signal and ID1 signal, and is identified as the main pack;

[0098] 4. The master package sends the slave package control message to the 2# battery pack in the 2# seat bucket through CAN bus communication;

[0099] 5. Battery pack 2# is awakened by the master pack message, detects ID2 and the master pack message, and is identified as a slave pack;

[0100] 6. The slave package replies to the message sent periodically by the master package, and the charging and discharging is controlled by the master package;

[0101] 7. The master package receives the message uploaded by the slave package, summarizes the battery cell data and protection board working status of the two packages, and forms a battery management system. The host is responsible for managing the charging and discharging process and communicating with the outside world;

[0102] 8. The master package monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the master package controls the slave package to disconnect the charging and discharging MOS and terminate the charging and discharging process;

[0103] 9. The master package stops sending slave package control messages, enters the dormant state, and its identity is restored to a non-identity package, waiting to be awakened next time;

[0104] 10. The slave package monitors and receives the control message of the master package in real time. When the master package stops sending messages, the slave package delays entering the dormant state and its identity is restored to a non-identity package, waiting to be awakened next time.

[0105] Example 2

[0106] The present embodiment provides a method for using an electric motorcycle lithium battery pack independently, which is applied to a single pack system. The single pack system includes a third battery seat bucket connected to the whole vehicle, and the third battery seat bucket is provided with a third battery pack. When the third battery pack is not placed in the seat bucket, it is a battery pack without an identity pack and cannot be charged or discharged. The third seat bucket contains a vehicle KEY signal or a charger C_IN signal terminal, but does not contain an ID1 / ID2 terminal. The method includes:

[0107] Put the third battery pack into the third battery holder barrel. After the third battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, its identity is converted to a single pack.

[0108] Single pack controls the charging and discharging process;

[0109] The single pack monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the single pack goes into sleep mode and its identity is restored to that of a battery pack without an identity pack.

[0110] Furthermore, the third battery pack is placed in the third battery holder barrel, and after the third battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, the identity is converted to a single pack, including:

[0111] Put the third battery pack into the third battery holder, and the vehicle KEY signal or the charger C_IN signal enables and wakes up the third battery pack in the third battery holder;

[0112] The third battery pack detects the KEY signal or C_IN signal but does not detect the ID1 and ID2 signals, and is identified as a single pack.

[0113] Furthermore, the single-packet control charging and discharging process includes: the single packet sends data according to the whole vehicle protocol and controls the charging and discharging.

[0114] Furthermore, the single pack monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the single pack goes into sleep mode and its identity is restored to a battery pack without an identity pack, including:

[0115] A single package monitors the vehicle's KEY signal and the charger's C_IN signal in real time, and stops charging and discharging when both signals are disabled;

[0116] When a single pack continuously monitors the vehicle's KEY signal and the charger's C_IN signal to be disabled, it enters a dormant state and its identity is restored to a battery pack with no identity, waiting to be awakened next time.

[0117] Example 3

[0118] This embodiment provides a dual-packet power balancing control method applied to the dual-packet series connection system in Embodiment 1, including:

[0119] When battery packs with inconsistent power levels are networked, if the SOC difference is greater than 30%, network charging is allowed but discharging is prohibited;

[0120] The main pack power indicator panel uses a specific LED animation to remind customers that the power difference between the two packs is too large and needs to be charged for equalization;

[0121] During the charging process, the battery pack with higher power is discharged as a whole group through the balancing module in the battery pack;

[0122] The balancing is controlled by PWM output, which can achieve higher balancing efficiency and less balancing heat;

[0123] When the power of the master package and the slave package is less than 3%, the balancing module stops working.

[0124] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for connecting electric motorcycle lithium battery packs in series for networking, characterized in that: Applied to a dual-pack series system, the dual-pack series system includes a first battery holder barrel and a second battery holder barrel connected in series on a vehicle, wherein the first battery holder barrel and the second battery holder barrel are respectively provided with a first battery pack and a second battery pack, wherein the first battery pack and the second battery pack are both non-identity pack battery packs when not placed in the holder barrels and cannot be charged or discharged, the method includes: The first battery pack is placed in the first battery holder barrel. After the first battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, its identity is converted to the main pack; including: Put the first battery pack into the first battery holder, and enable and wake up the first battery pack in the first battery holder by the vehicle KEY signal or the charger C_IN signal; The first battery pack detects the KEY signal or C_IN signal and the ID1 signal, and is identified as the main pack; The second battery pack is placed in the second battery holder barrel. After the second battery pack is awakened by the master pack communication, its identity is converted to a slave pack; including: The second battery pack is placed in the second battery holder barrel, and the master pack sends a slave pack control message to the second battery pack in the second battery holder barrel via CAN bus communication; The second battery pack is awakened by the slave pack control message sent by the master pack, detects ID2 and the slave pack control message sent by the master pack, and is identified as a slave pack; The main package controls the charging and discharging process; The master pack monitors the vehicle's KEY signal and the charger's C_IN signal in real time. When both signals are disabled, the master pack and the slave pack enter sleep mode respectively, and their identities are restored to battery packs without identity packs.

2. The method for using electric motorcycle lithium battery packs in series networking according to claim 1, characterized in that: The main package controls the charging and discharging process, including: The master packet periodically sends a slave packet control message to the slave packet, wherein the slave packet replies to the slave packet control message sent by the master packet periodically, and the charging and discharging is controlled by the master packet; The master package receives the message uploaded by the slave package, summarizes the battery cell data and the working status of the protection board of the two packages, and forms a battery management system. The host is responsible for managing the charging and discharging process and communicating with the outside world.

3. The method for using electric motorcycle lithium battery packs in series networking according to claim 1, characterized in that: The master pack monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the master pack and the slave pack enter sleep mode respectively, and the identities are restored to battery packs without identity packs, including: The master package monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the master package controls the slave package to disconnect the charging and discharging MOS and terminate the charging and discharging process. The master package stops sending slave package control messages, enters a dormant state, and restores its identity to a battery package without an identity, waiting to be awakened next time; The slave package monitors and receives the slave package control message sent by the master package in real time. When the master package stops sending the slave package control message, the slave package delays entering the sleep state and its identity is restored to a battery package without identity, waiting to be awakened next time.

4. A method for using an electric motorcycle lithium battery pack independently, characterized in that: Applied to a single-pack system, the single-pack system includes a third battery holder barrel connected to the whole vehicle, the third battery holder barrel is provided with a third battery pack, wherein the third battery pack is a non-identity pack battery pack when not placed in the holder barrel, and cannot be charged or discharged, and the third battery holder barrel contains a whole vehicle KEY signal or a charger C_IN signal terminal, but does not contain an ID1 / ID2 terminal; the method includes: Put the third battery pack into the third battery holder barrel. After the third battery pack is awakened by the vehicle KEY signal or the charger C_IN signal, its identity is converted to a single pack; including: Put the third battery pack into the third battery holder, and the vehicle KEY signal or the charger C_IN signal enables and wakes up the third battery pack in the third battery holder; The third battery pack detects the KEY signal or C_IN signal but does not detect the ID1 and ID2 signals, and is identified as a single pack; Single pack controls the charging and discharging process; The single pack monitors the vehicle KEY signal and the charger C_IN signal in real time. When both signals are disabled, the single pack goes into sleep mode and its identity is restored to a battery pack without identity. This includes: A single package monitors the vehicle's KEY signal and the charger's C_IN signal in real time, and stops charging and discharging when both signals are disabled; When a single pack continuously monitors the vehicle's KEY signal and the charger's C_IN signal to be disabled, it enters a dormant state and its identity is restored to a battery pack with no identity, waiting to be awakened next time.

5. The method for using an electric motorcycle lithium battery pack independently as claimed in claim 4, characterized in that: The single-packet control charging and discharging process includes: the single packet sends data according to the whole vehicle protocol and controls the charging and discharging.

6. A dual-packet power balancing control method applied to the dual-packet series connection system of claim 1, characterized in that: include: When battery packs with inconsistent power levels are networked, and the SOC difference is greater than 30%, network charging is allowed but discharging is prohibited; The main pack power indicator panel uses a specific LED animation to remind customers that the power difference between the two packs is too large and needs to be charged to balance. During the charging process, the battery pack with higher power is discharged as a whole group through the balancing module in the battery pack, where the balancing module is controlled by PWM output; When the power of the master package and the slave package is less than 3%, the balancing module stops working.

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