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Charging heating system for electric bicycle lithium ion battery, and control method for charging heating system

A lithium-ion battery, electric bicycle technology, applied in electric vehicles, battery circuit devices, secondary batteries, etc., can solve the problems of affecting battery safety, small battery capacity, difficult application, etc., and achieve simple and reliable methods, small size, cost low cost effect

Inactive Publication Date: 2016-03-30
TIANJIN XIANZHONG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are difficult to apply to lithium-ion batteries for electric bicycles.
The main reasons are: First, the battery capacity of electric bicycles is small, generally only 5-20Ah, and users often recharge the battery when the battery is completely discharged. If the battery itself is used to heat the battery, it is likely to cause excessive discharge of the battery. damaged battery
The second is that the control methods of some technologies are too complicated and require high-precision BMS and temperature measurement systems to realize, which greatly increases the production cost of batteries. As a means of transportation for ordinary people, electric bicycles are very sensitive to battery prices.
However, electric bicycle batteries are small in size and compact in structure design, and it is impossible to place switching components such as mechanical relays in traditional technologies
Therefore, these factors restrict the normal use of electric bicycle batteries under low temperature conditions, and even produce technical problems such as seriously affecting battery safety.

Method used

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  • Charging heating system for electric bicycle lithium ion battery, and control method for charging heating system
  • Charging heating system for electric bicycle lithium ion battery, and control method for charging heating system

Examples

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Embodiment 1

[0029] An electric bicycle lithium-ion battery charging and heating system, including a control IC5, a heating switch 3, a charging switch 2, a PI heating belt 4 and a thermal switch 6; the charging switch is used to connect the charger 7 and the battery 1, and the heating switch 3 is connected to control The PI heating belt 4 is connected to the control IC 5 of the thermal switch 6 to control the heating switch 3 and the charging switch 2 . The heating switch 3 and the charging switch 2 are MOSFET tubes. The thermal switch 2 is a normally closed thermal switch, that is, when the battery temperature is lower than its disconnection temperature T1, the thermal switch 6 is in the closed state, and when the battery temperature is higher than the temperature T1, the thermal switch 6 is in the open state. When the battery temperature drops to the reset temperature T0 again, the thermal switch 6 is in the closed state again. The control IC1 is connected with the thermal switch 6, th...

Embodiment 2

[0031] A control method for a charging and heating system of a lithium-ion battery of an electric bicycle. A control IC controls a heating switch and a charging switch according to the switching state of a thermal switch; Charging; when the battery temperature is low and it is not suitable for direct charging, the control IC controls the heating switch to turn on, first use the PI heating belt to heat the battery, and then charge the battery.

[0032] The control process includes: charging starts, and the control IC judges whether the thermal switch is off. If the thermal switch is in the off state, the control IC controls the heating switch to be off, the charging switch to be on, and the charger will charge the battery normally. Otherwise, the thermal switch is in the on state, the control IC controls the charging switch to be off, the electric heating switch is on, the charger and the PI heating belt are in the on state, and starts to heat the battery until the thermal swit...

Embodiment 3

[0034] The invention relates to a control method of a lithium-ion battery charging and heating system of an electric bicycle. A control IC controls a heating switch and a charging switch according to the switching state of a thermal switch. The opening temperature T1 of the thermal switch is 20°C, the reset temperature T0 is 10°C, and the initial temperature T2 of the battery is 25°C. Such as figure 1 Connect the charging and heating system as shown. After the charger is connected to the system, since the initial temperature T2 of the battery is higher than the thermal switch disconnection temperature T1, and the thermistor is in the disconnected state, the control IC controls the heating switch to be disconnected and the charging switch to be connected, and the charger is considered to be normal for the battery. Charge until the end of charging.

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PUM

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Abstract

The invention relates to a charging heating system for an electric bicycle lithium ion battery, and a control method for the charging heating system, and belongs to the technical field of the lithium ion battery. The charging heating system for the electric bicycle lithium ion battery comprises a control IC, a heating switch, a charging switch, a PI heating tape and a thermoswitch, wherein the charging switch is connected with the battery in series to form a charging system; the heating switch is connected with the PI heating tape in series to form a heating system; the control method for the charging heating system for the electric bicycle lithium ion battery comprises the steps that the control IC controls the heating switch and the charging switch according to the switching state of the thermoswitch; when the battery temperature is suitable for direct charge, the control IC controls the charging switch to be switched on to directly charge the battery by a charger; when the battery temperature is low and not suitable for direct charge, the control IC controls the heating switch to be switched on, and the PI heating tape is used for heating the battery firstly, and then the battery is charged. The charging heating system has the advantages of simple structure, low cost, convenient control, safety, reliability, small size, excellent performance, long service life and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a charging and heating system for lithium-ion batteries of electric bicycles and a control method thereof. Background technique [0002] Lithium-ion batteries have high specific energy density, long cycle life, and environmental friendliness, making them ideal for use as power sources for electric bicycles. At present, lithium electrification of electric bicycles has become a major trend in the development of electric bicycles. Lithium-ion batteries use graphite as the negative electrode active material, but the lithium ion diffusion rate of the graphite negative electrode is low at low temperature, and the charge transfer impedance on the electrode / electrolyte interface is relatively large during the lithium intercalation process. Precipitation, irreversible attenuation of battery performance, and even serious lithium precipitation to produce lithium dendrites, pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/615H01M10/625H01M10/6572
CPCH02J7/00
Inventor 李凤民纪继坤
Owner TIANJIN XIANZHONG SCI & TECH