CN215008441U

CN215008441U - High-safety lithium ion battery for electric forklift

Info

Publication number: CN215008441U
Application number: CN202120102678.6U
Authority: CN
Inventors: 朱明海; 沙树勇; 董志成; 姜庆海; 王大林; 蒋仕平; 孟云; 施晓渝; 尤兆坤
Original assignee: Huafu Jiangsu Lithium Electricity New Technology Co ltd
Current assignee: Huafu Jiangsu Lithium Electricity New Technology Co ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-12-03
Anticipated expiration: 2031-01-15

Abstract

The utility model relates to a high-safety lithium ion battery for electric fork-lift truck, include by outer casing protecgulum and outer casing back cover, the outer casing that the amalgamation forms, install battery module and battery management system in the outer casing, the nested inner shell that is fixed with in the outer casing, the inner shell includes inner shell protecgulum and inner shell back cover, the battery module is established ties by a plurality of specifications, the battery module that the structure is the same and is formed, each battery module is fixed in the inner shell side by side, the battery management system pastes in the top outside of inner shell back cover; the battery modules respectively comprise a lithium ion battery cell, a PCB assembly board and a flame-retardant epoxy board; the lithium ion battery cells are arranged in parallel according to the series connection sequence of the positive and negative electrodes; the positive and negative electrodes of the lithium ion battery cell upwards penetrate through the corresponding pole lug holes on the PCB assembly board and are bent and welded on the copper-clad bonding pad, and the other five surfaces of the battery module are respectively adhered with the flame-retardant epoxy boards. The lithium ion battery can solve the problems of poor product consistency, low monomer energy, complex series-parallel connection structure and easy deflagration after being impacted by external force.

Description

High-safety lithium ion battery for electric forklift

Technical Field

The utility model relates to a lithium ion battery especially relates to an electric fork-lift uses high safe lithium ion battery, belongs to lithium cell technical field.

Background

The lithium battery has the advantages of high gravimetric specific energy, high-rate charge and discharge, long service life, environmental protection, maintenance free and the like, and particularly, the rapid price reduction is promoted by the industrial development of the power lithium battery, so that the lithium battery electric forklift just begins to develop and is out of gear. The use of lithium batteries for electric forklifts is a necessary trend in industry development.

Considering complete car structure and supporting and the colour effect, electric fork-lift design is basically fixed to the space size of putting of battery, and the battery producer only needs to accomplish the inside design development of shell. The traditional lithium ion battery for 1500kg electric forklift has the following potential safety hazards: 1. the battery module generally adopts a square aluminum shell lithium battery or a ternary cylindrical lithium battery, the square aluminum shell lithium battery has low energy density and poor consistency, while the ternary cylindrical lithium battery has low monomer energy, a complex series-parallel structure and high BMS (battery management system) requirement, heat accumulated in a battery core is difficult to release, and the arrangement structure is restricted; 2. the traditional lithium ion battery adopts a BMS single protection mode for functional safety, software protection fails, a battery module works in a naked state, and the safety factor is low; 3. by adopting the single-layer shell structure, the battery and the electric part can not be effectively isolated, the battery module is easy to detonate due to external impact, and the battery module is easy to fall off due to vibration and bumping.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric fork-lift uses high safe lithium ion battery can solve the product uniformity poor, and the monomer energy is low, and the problem of the easy deflagration after the structure complicacy of connecting in series and parallel and receiving external force striking.

The utility model discloses a high-safety lithium ion battery for electric fork-lift truck, include the shell that is formed by shell protecgulum and shell back cover amalgamation, install battery module and battery management system in the shell, lithium ion battery still includes charge mouth, discharge port and fuse seat, charge mouth is fixed in the upper portion of shell, the discharge port is fixed in the lower part of shell, the fuse seat is fixed in the middle part of shell back cover width direction, the fuse is fixed in the fuse seat;

an inner shell is fixed in the outer shell in a nested mode, the inner shell comprises an inner shell front cover and an inner shell rear cover, the battery module is formed by connecting a plurality of battery modules with the same specification and structure in series, the battery modules are fixed in the inner shell in parallel, and the battery management system is adhered to the outer side of the top of the inner shell rear cover; and a relay is fixed on the outer side of the side wall of the inner shell rear cover and is connected with the battery management system in series.

Further, the battery modules respectively comprise a lithium ion battery cell, a PCB assembly board and a flame-retardant epoxy board; the lithium ion battery cells are arranged in parallel according to the series connection sequence of the positive electrode and the negative electrode; and positive and negative electrodes of the lithium ion battery cell upwards penetrate through corresponding electrode lug holes on the PCB assembly board and are bent and welded on the copper-clad bonding pad, and the other five surfaces of the battery module are respectively adhered with the flame-retardant epoxy boards.

Furthermore, cushion pads are respectively arranged at the central position between the inner shell rear cover and the outer shell rear cover and the central position between the inner shell front cover and the outer shell front cover.

Further, the size of the cushion pad is 150 × 25 × 8 mm.

Furthermore, the inner shell and the outer shell as well as the inner shell and the battery module are fixed through a limiting groove with reinforcing ribs and a mortise and tenon structure.

Furthermore, the inner shell rear cover and the inner shell front cover, and the outer shell rear cover and the outer shell front cover are fixed through self-tapping screws.

Further, the upper portion of shell is equipped with fretwork portion, the top of fretwork portion is the handle, the top of handle is equipped with the hasp.

Further, the charging port is fixed on a shoulder of the handle.

The utility model has the advantages that:

1. the battery case adopts an inner shell and outer shell double-layer structure to form an independent battery chamber and an electric chamber, so that the battery and an electric part are effectively isolated, the battery module cannot fall off due to vibration and bumping, and cannot explode due to external force impact, and the safety of the lithium ion battery is improved.

2. The positive and negative electrodes are bent and welded on the copper-clad welding pads of the PCB assembly board, so that the lithium ion battery cells are directly connected in series or in parallel, the operation is very convenient and fast, and the flame-retardant epoxy boards are respectively stuck on the other five surfaces, so that the safety of the battery module can be further improved.

3. The battery management system and the relay are used for functional safety, and even if software overvoltage, overcurrent and overtemperature protection of the battery management system fails, the relay can provide secondary protection immediately.

4. In the charging process, current flows to the negative electrode of the charging port from the positive electrode of the charging port through the relay, the fuse, the positive electrode of the battery module, the negative electrode of the battery module and the battery management system in sequence, and the charging of the lithium battery is completed; in the discharging process, current flows to the cathode of the battery module from the anode of the battery module through the fuse, the relay, the anode of the discharging port, the load, the cathode of the discharging port and the battery management system, and discharging of the lithium battery is completed.

5. Simple structure, the energy density of unit volume is high, easily dispels the heat, puts the structure and does not have the restriction, and the equipment is swift convenient.

Drawings

Fig. 1 is a perspective view of the high-safety lithium ion battery for the electric forklift of the present invention;

FIG. 2 is an exploded perspective view of FIG. 1;

fig. 3 is an exploded view of the battery module of fig. 1.

In the figure: 1. a battery management system; 2. a rear cover of the inner shell; 3. a housing rear cover; 4. a fuse; 5. a rubber plug; 6. a relay; 7. a fuse holder; 8. a lithium ion cell; 9, assembling a PCB; 10. a front cover of the inner shell; 11. a discharge port; 12. a housing front cover; 13. a charging port; 14. a battery module; 15. a flame retardant epoxy board; 16. and (5) locking.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1 to 3, the high-safety lithium ion battery for the electric forklift comprises an outer shell formed by splicing an outer shell front cover 12 and an outer shell rear cover 3, wherein a battery module and a battery management system 1 (namely, BMS) are installed in the outer shell, an inner shell is embedded and fixed in the outer shell and comprises an inner shell front cover 10 and an inner shell rear cover 2, the battery module is formed by connecting two battery modules 14 with the same specification and structure in series, the two battery modules 14 are fixed in the inner shell side by side, and the battery management system 1 is adhered to the outer side of the top of the inner shell rear cover 2; the battery module 14 comprises a lithium ion battery cell 8, a PCB assembly board 9 and a flame-retardant epoxy board 15 respectively; the lithium ion battery cells 8 are arranged in parallel according to the series connection sequence of the positive and negative electrodes; the positive and negative electrodes of the lithium ion cell 8 upwards pass through the corresponding pole ear holes on the PCB assembly board 9 and are bent and welded on the copper-clad bonding pad, and the other five surfaces of the battery module 14 are respectively stuck with flame-retardant epoxy plates 15.

Charging port 13 is fixed on the upper portion of shell, and discharge port 11 is fixed in the lower part of shell, and fuse seat 7 is fixed in the middle part of lid 3 width direction behind the shell, and fuse 4 is fixed in fuse seat 7, and the outer port of fuse seat 7 is equipped with rubber buffer 5.

And a relay 6 is fixed on the outer side of the side wall of the inner shell rear cover 2, and the relay 6 is connected with the battery management system 1 in series. By adopting the dual protection mode of the battery management system 1 and the relay 6, even if the software overvoltage, overcurrent and overtemperature protection of the battery management system 1 fails, the relay 6 can provide secondary protection immediately.

Cushion pads are respectively provided at the center position between the inner casing rear cover 2 and the outer casing rear cover 3 and the center position between the inner casing front cover 10 and the outer casing front cover 12. The size of the cushion is 150X 25X 8 mm.

The inner shell and the outer shell as well as the inner shell and the battery module 14 are fixed through a limiting groove with reinforcing ribs and a mortise and tenon structure. The inner shell rear cover 2 and the inner shell front cover 10, and the outer shell rear cover 3 and the outer shell front cover 12 are fixed by self-tapping screws.

The upper portion of shell is equipped with fretwork portion, and the top of fretwork portion is the handle, the top of handle is equipped with hasp 16. The charging port 13 is fixed to the shoulder of the handle.

The battery case adopts an inner shell and outer shell double-layer structure to form an independent battery chamber and an electric chamber, so that the battery and an electric part are effectively isolated, the battery module cannot fall off due to vibration and bumping, and cannot explode due to external force impact, and the safety of the lithium ion battery is improved.

In the charging process, current flows from the positive electrode of the charging port 13 to the negative electrode of the charging port 13 through the relay 6, the fuse 4, the positive electrode of the battery module, the negative electrode of the battery module and the battery management system 1 in sequence to complete the charging of the lithium battery; in the discharging process, current flows from the positive electrode of the battery module to the negative electrode of the battery module through the fuse 4, the relay 6, the positive electrode of the discharging port 11, the load, the negative electrode of the discharging port 11 and the battery management system 1, and discharging of the lithium battery is completed.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides an electric fork-lift uses high safe lithium ion battery, includes the shell that forms by lid (3) amalgamation behind shell protecgulum (12) and the shell, install battery module and battery management system (1), its characterized in that in the shell: the fuse protector is characterized by further comprising a charging port (13), a discharging port (11) and a fuse holder (7), wherein the charging port (13) is fixed to the upper portion of the shell, the discharging port (11) is fixed to the lower portion of the shell, the fuse holder (7) is fixed to the middle of the shell rear cover (3) in the width direction, and the fuse (4) is fixed in the fuse holder (7);

an inner shell is fixed in the outer shell in a nested mode, the inner shell comprises an inner shell front cover (10) and an inner shell rear cover (2), the battery module is formed by connecting a plurality of battery modules (14) with the same specification and structure in series, the battery modules (14) are fixed in the inner shell in parallel, and the battery management system (1) is adhered to the outer side of the top of the inner shell rear cover (2); and a relay (6) is fixed on the outer side of the side wall of the inner shell rear cover (2), and the relay (6) is connected with the battery management system (1) in series.

2. The high-safety lithium ion battery for the electric forklift according to claim 1, characterized in that: the battery modules (14) respectively comprise lithium ion cells (8), PCB assembly boards (9) and flame-retardant epoxy boards (15); the lithium ion cells (8) are arranged in parallel according to the series connection sequence of the positive electrode and the negative electrode; and positive and negative electrodes of the lithium ion battery cell (8) upwards penetrate through corresponding pole lug holes on the PCB assembly board (9) and are bent and welded on the copper-clad welding pad, and five surfaces of the battery module (14) which are not provided with the PCB assembly board are respectively adhered with the flame-retardant epoxy boards (15).

3. The high-safety lithium ion battery for the electric forklift according to claim 1, characterized in that: and cushion pads are respectively arranged at the central position between the inner shell rear cover (2) and the outer shell rear cover (3) and the central position between the inner shell front cover (10) and the outer shell front cover (12).

4. The high-safety lithium ion battery for the electric forklift according to claim 3, characterized in that: the size of the cushion pad is 150X 25X 8 mm.

5. The high-safety lithium ion battery for an electric forklift according to any one of claims 1 to 4, characterized in that: the inner shell and the outer shell as well as the inner shell and the battery module (14) are fixed through limiting grooves with reinforcing ribs and tenon-and-mortise structures.

6. The high-safety lithium ion battery for an electric forklift according to any one of claims 1 to 4, characterized in that: the inner shell rear cover (2) and the inner shell front cover (10) as well as the outer shell rear cover (3) and the outer shell front cover (12) are fixed through self-tapping screws.

7. The high-safety lithium ion battery for the electric forklift according to claim 1, characterized in that: the upper portion of shell is equipped with fretwork portion, the top of fretwork portion is the handle, the top of handle is equipped with hasp (16).

8. The high-safety lithium ion battery for the electric forklift according to claim 7, wherein: the charging port (13) is fixed on the shoulder part of the handle.