Lithium ion battery dual-power-supply power supply system of intelligent power-assisted bicycle

Abstract

The invention discloses a lithium ion battery dual-power supply system for an intelligent moped, and the system comprises double batteries, the double batteries comprise two lithium ion battery packs connected in parallel, and each lithium ion battery pack is formed by connecting a plurality of single lithium ion battery cells in series after the single lithium ion battery cells are connected in series; the charging and discharging system comprises a discharging circuit and a charging circuit; and a BMS protection detection circuit. Wherein the discharging circuit dynamically selects double-battery discharging, and when the electric quantity of the main battery is higher than that of the slave battery, the main battery is firstly discharged to 30% of SOC and then is switched to the slave battery; when the electric quantity of the slave battery is higher than that of the master battery, the slave battery is firstly discharged to about 0% of SOC and then switched to the master battery; the charging circuit charges the dual batteries, first charges the master battery, then to the slave battery, and supports recharging the slave battery if there is still an output after the battery is fully charged. Through dynamic selection of a charging and discharging system, a main battery is discharged firstly, and a secondary battery is switched when the electric quantity of the main battery is lower than 30%. And when the slave battery is high, the slave battery is switched to the master battery after the slave battery is emptied. Charging is characterized in that during parallel charging, the main battery is firstly charged, then the auxiliary battery is charged, the battery has output after full charging, the auxiliary battery is supported to be recharged, and the trouble that an existing intelligent electric vehicle is provided with a single power source, the endurance mileage is short, and the requirement of a long-mileage endurance user cannot be met is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of intelligent electric bicycles, and in particular relates to a lithium-ion battery dual power supply system for an intelligent power-assisted bicycle. Background Art

[0002] Smart electric bicycles are vehicles that use lithium batteries as auxiliary energy sources, and are based on ordinary bicycles and equipped with motors, controllers, lithium batteries, throttles, brakes and other operating components and display instrument systems. Compared with traditional electric vehicles, they are lighter and more labor-saving to ride, and are increasingly favored by urban users.

[0003] With the introduction of the national standard electric vehicle policy, current electric vehicles are powered by a set of lithium-ion batteries. Users first charge the lithium-ion battery, and then use the lithium-ion battery to power the electric vehicle. When the power is used up, the charger is used to charge the lithium-ion battery again. Therefore, when the lithium-ion battery of the electric vehicle is out of power during use, it can only be charged before it can be driven normally. Its disadvantages: When the lithium-ion battery of the electric vehicle is out of power during use, it cannot continue to be used. It can only wait for the lithium-ion battery to be charged, and the waiting time for charging is relatively long, which cannot increase the frequency of use of the electric vehicle. The cruising range is short and cannot meet the requirements of users with long mileage.

[0004] Therefore, a dual-battery power supply system for use in intelligent power-assisted bicycles needs to be studied urgently. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a lithium-ion battery dual power supply system for an intelligent power-assisted bicycle, which is used to avoid the trouble of the previous intelligent electric vehicles having a single power supply, a short cruising range, and being unable to meet the requirements of users for long mileage.

[0006] In order to solve the above technical problems, the present invention discloses a lithium-ion battery dual power supply system for an intelligent power-assisted bicycle, comprising: Dual battery, dual battery includes two parallel lithium-ion battery packs, and the lithium-ion battery pack is composed of multiple single lithium-ion cells connected in series; A charging and discharging system, the charging and discharging system comprising a discharging circuit and a charging circuit; and BMS protection detection circuit; The discharge circuit dynamically selects dual battery discharge. When the power of the master battery is higher than that of the slave battery, the master battery will first discharge to SOC 30% and then switch to the slave battery. When the power of the slave battery is higher than that of the master battery, the slave battery will first discharge to SOC about 0% and then switch to the master battery. For dual battery charging, the charging circuit first charges the master battery and then the slave battery. If there is still output after the battery is fully charged, it supports recharging the slave battery.

[0007] According to one embodiment of the present invention, the BMS protection detection circuit has overvoltage protection, overcurrent protection, overcharge protection, temperature protection, unit voltage detection protection, temperature protection, and over-discharge protection.

[0008] According to one embodiment of the present invention, the above-mentioned BMS protection detection circuit includes at least a current sensor, a voltage monitor, a battery intelligent manager and a relay. The current sensor is arranged on the negative terminal circuit of the battery pack and is connected to the battery intelligent manager via a data line to complete the output current and input current detection of the battery pack; the voltage monitor is connected to the positive port and the negative port of the battery pack via wires, respectively, and is connected to the battery intelligent manager via a data line to complete the battery pack voltage information detection; the relay is arranged on the load end ignition circuit and is connected to the battery intelligent manager via a data line, and is controlled by the battery intelligent manager.

[0009] According to one embodiment of the present invention, the two output voltages provided by the battery pack are ±36V ~ 48V.

[0010] According to an embodiment of the present invention, the charging circuit has a charger interface and a solar panel charging interface.

[0011] Compared with the prior art, the present invention can achieve the following technical effects: Through dynamic selection of the charging and discharging system, the main battery is discharged first when the main battery is high, and the slave battery is switched to when the main battery is less than 30%. When the slave battery is high, the slave battery is used first, and the slave battery is switched to the main battery after it is emptied. Charging characteristics: When charging in parallel, the main battery is charged first, and then the slave battery. After full charging, the battery has output and supports recharging of the slave battery, avoiding the trouble of single power supply of previous smart electric vehicles, short cruising range, and inability to meet the requirements of users with long mileage.

[0012] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of a lithium-ion battery dual power supply system for an intelligent power-assisted bicycle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0014] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0015] Please refer to Figure 1 , Figure 1 It is a schematic diagram of a lithium-ion battery dual power supply system for an intelligent power-assisted bicycle according to an embodiment of the present invention.

[0016] As shown in the figure, a lithium-ion battery dual power supply system for an intelligent power-assisted bicycle includes: a dual battery, the dual battery includes two parallel lithium-ion battery packs, the lithium-ion battery packs are composed of multiple single lithium-ion cells connected in series; a charging and discharging system, the charging and discharging system includes a discharge circuit and a charging circuit; and a BMS protection detection circuit.

[0017] When the dual battery power source forms a complete lithium battery pack or lithium battery group, the discharge output ports cannot be connected in series or parallel, otherwise the lithium battery will lose balance and cause explosion hazard. Therefore, the present invention designs a charging and discharging system to complete the extended range power supply.

[0018] Specifically, the discharge circuit dynamically selects dual battery discharge. When the power of the master battery is higher than that of the slave battery, the master battery will first discharge to SOC 30% and then switch to the slave battery. When the power of the slave battery is higher than that of the master battery, the slave battery will first discharge to SOC about 0% and then switch to the master battery. For dual battery charging, the charging circuit first charges the master battery and then the slave battery. If there is still output after the battery is fully charged, it supports recharging the slave battery.

[0019] The BMS protection detection circuit has overvoltage protection, overcurrent protection, overcharge protection, temperature protection, unit voltage detection protection, temperature protection, and over-discharge protection.

[0020] The BMS protection detection circuit includes at least a current sensor, a voltage monitor, a battery intelligent manager and a relay. The current sensor is arranged on the negative terminal line of the battery pack and is connected to the battery intelligent manager via a data line to complete the output current and input current detection of the battery pack; the voltage monitor is connected to the positive port and the negative port of the battery pack via wires, respectively, and is connected to the battery intelligent manager via a data line to complete the battery pack voltage information detection; the relay is arranged on the load end ignition circuit and is connected to the battery intelligent manager via a data line, and is controlled by the battery intelligent manager.

[0021] The battery pack provides two sets of output voltage of ±36V ~ 48V, which is suitable for powering most electric bicycles and is safe and reliable.

[0022] The charging circuit has a charger interface and a solar panel charging interface, which can further improve the charging efficiency.

[0023] In summary, the present invention uses the dynamic selection of the charging and discharging system to discharge the main battery first when the main battery is high, and switch to the auxiliary battery when the main battery power is lower than 30%. When the slave battery is high, the slave battery is used first, and the slave battery is switched to the main battery after it is emptied. Charging characteristics: When charging in parallel, the main battery is charged first, and then the auxiliary battery is charged. After full charging, the battery has output and supports the recharging of the auxiliary battery, avoiding the trouble of the previous single power supply of smart electric vehicles, short cruising range, and inability to meet the requirements of users with long mileage.

[0024] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A lithium-ion battery dual power supply system for an intelligent power-assisted bicycle, characterized in that: include: A dual battery, wherein the dual battery comprises two parallel-connected lithium-ion battery packs, wherein the lithium-ion battery packs are composed of a plurality of single-cell lithium-ion battery cells connected in series; A charging and discharging system, the charging and discharging system comprising a discharging circuit and a charging circuit; and BMS protection detection circuit; The discharging circuit dynamically selects dual battery discharge. When the power of the master battery is higher than that of the slave battery, the master battery will first be discharged to SOC 30% and then switched to the slave battery. When the power of the slave battery is higher than that of the master battery, the slave battery will first be discharged to SOC about 0% and then switched to the master battery. For dual battery charging, the charging circuit first charges the master battery and then the slave battery. If there is still output after the battery is fully charged, the slave battery can be recharged.

2. The lithium-ion battery dual power supply system for an intelligent power-assisted bicycle according to claim 1, characterized in that: The BMS protection detection circuit has overvoltage protection, overcurrent protection, overcharge protection, temperature protection, unit voltage detection protection, temperature protection, and over-discharge protection.

3. The lithium-ion battery dual power supply system for an intelligent power-assisted bicycle according to claim 1, characterized in that: The BMS protection detection circuit includes at least a current sensor, a voltage monitor, a battery intelligent manager and a relay. The current sensor is arranged on the negative terminal line of the battery pack and is connected to the battery intelligent manager via a data line to complete the output current and input current detection of the battery pack; the voltage monitor is connected to the positive port and the negative port of the battery pack via wires, respectively, and is connected to the battery intelligent manager via a data line to complete the battery pack voltage information detection; the relay is arranged on the load end ignition circuit and is connected to the battery intelligent manager via a data line, and is controlled by the battery intelligent manager.

4. The lithium-ion battery dual power supply system for an intelligent power-assisted bicycle according to claim 1, characterized in that: The battery pack provides two output voltages of ±36V ~ 48V.

5. The lithium-ion battery dual power supply system for an intelligent power-assisted bicycle according to claim 1, characterized in that: The charging circuit has a charger interface and a solar panel charging interface.

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