Quick charging device and method for forklift

A fast charging and forklift technology, applied in the field of forklifts, can solve the problems of affecting the service life, high price, long charging time, etc., to ensure the discharge capacity, reduce the procurement cost, and prolong the service life.

Pending Publication Date: 2021-11-26
ANHUI HELI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are two charging methods for low-voltage lithium battery forklifts on the market: the first one is to use a special low-voltage lithium battery charger to charge the lithium battery after taking power from the grid and converting it to a low voltage through the charger. Different voltage levels Forklifts need to purchase special chargers for different types of lithium battery forklifts. At the same time, the utilization rate of special equipment is not high, and the price is expensive; the second is to use the general charging pile of electric bus for charging. The output voltage is 300-600VAC, the maximum charging current is 200A, and the charging management is carried out through CAN communication control. The working voltage range of lithium battery forklifts is 24-96V DC low voltage. The charging current is much higher than 200A, so it is currently impossible to directly use electric bus charging piles; if the charging current is limited to 200A for charging through technical means, the charging time required is equivalent to that of lead-acid batteries with the same capacity, and lithium batteries cannot be used. The fast charging characteristics of the battery, at the same time, the charging gun works at the peak current for a long time, which will seriously affect the service life, increase the use cost of lithium battery forklifts, and reduce market competitiveness
[0004] It can be seen that the above two charging methods have defects such as high equipment procurement costs, poor versatility, and long charging time, which bring inconvenience to end users and increase equipment investment costs. Therefore, the charging problem has become a limit to the further promotion and use of lithium battery forklifts. A bottleneck that needs to be resolved urgently
Especially for the existing fast charging problem, there is no effective solution yet

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0049] A lithium battery module 2, including four 96V / 150Ah identical lithium battery module 2 units L M1 / L M2 / L M3 / L M4 , each lithium battery module 2 unit is composed of six 16V / 150Ah lithium battery cells connected in series. 600Ah, the battery pack contains a BMS power management system, which consists of 5 charging contactors K c0、 K c1、 K c2、 K c3、 K c4 The charging contactor group 1 composed of 6 discharging contactors K d1-1、 K d1-2、 K d1-3、 K d2-1、 K d2-2、 K d2-3 Composed of discharge contactor group 3. When the high-voltage charging pile is powered on, K c0、 K c1、 K c2、 K c3 The contact is closed and the current flows through the positive pole of the charging socket -> K c1 -> L M-1 -> K c2 -> L M-2 -> K c3 -> L M-3 -> K c4 -> L M-4 -> K c0 -> The negative pole of the charging socket connects 4 lithium battery modules 2 units in series. At this time, the output voltage of the high-voltage charging pile is 96V*4=384V, and the standard ou...

Embodiment 2

[0051] A lithium battery module 2, including two 76.8V / 272Ah lithium battery module 2 units L with identical specifications M1 / L M2 , each module unit is composed of three 25.6V / 272Ah lithium battery cells connected in series, the voltage of the whole battery pack is 25.6V*3=76.8V, and the capacity is 272Ah*2=514Ah, so the specification of the whole battery pack is 76.8V / 514Ah, the battery pack contains a BMS power management system, which consists of 3 charging contactors K c0、 K c1、 K c2 The charging contactor group 1 composed of 4 discharging contactors K d1-1、 K d1-2、 K d2-1、 K d2-2 Composed of discharge contactor group 3. When the high-voltage charging pile is powered on, K c0、 K c1、 K c2 The contact is closed and the current flows through the positive pole of the charging socket -> K c1 -> L M-1 -> K c2 -> L M-2 -> K c0 -> The negative pole of the charging socket connects two lithium battery modules in series. At this time, the output voltage of the high...

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Abstract

The invention relates to a quick charging device for a forklift. The device comprises: a lithium battery module used for providing electric energy for an electric forklift; a high-voltage charging pile used for charging the electric forklift; a voltage conversion device used for converting the connection mode of each lithium ion unit module in the lithium battery module into a series loop from a parallel mode for charging and converting the connection mode of each lithium ion unit module in the lithium battery module from a series loop to a parallel mode for power supply; and electric energy which sequentially passes through the high-voltage charging pile and the voltage conversion device from a power grid to charge the lithium battery module. The lithium battery module discharges through the voltage conversion device. The invention further discloses a charging method of the quick charging device for the forklift. According to the voltage conversion device, a charging pile platform which is popularized, popularized and applied can be utilized, according to different voltage grades of the forklift, the fast charging characteristic of the lithium battery is fully utilized, the lithium battery forklift can be rapidly charged, special equipment is not needed, and the purchase cost is reduced.

Description

technical field [0001] The invention relates to the technical field of forklifts, in particular to a fast charging device and method for forklifts. Background technique [0002] As lithium battery technology becomes more and more mature, the production scale is expanding day by day, and the cost continues to decrease, lithium battery forklifts have gradually replaced lead-acid battery forklifts due to their advantages of intermittent charging and convenient charging. The implementation of the country's new energy and environmental protection policy has also stimulated the vigorous development of the electric vehicle industry. In order to solve the charging problem of electric vehicles, many charging piles have been built. [0003] At present, there are two charging methods for low-voltage lithium battery forklifts on the market: the first one is to use a special low-voltage lithium battery charger to charge the lithium battery after taking power from the grid and converting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00B60L53/62B60L58/22B60L58/21
CPCH02J7/0024H02J7/0014H02J7/0048H02J7/00714H02J7/007182B60L53/62B60L58/22B60L58/21Y02T10/70Y02T10/7072Y02T90/12
Inventor 张再磊陈伟林程胜朱坤
Owner ANHUI HELI CO LTD
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