阅读说明：本技术 一种电动叉车的电池箱及使用该电池箱的电动叉车 (Battery box of electric forklift and electric forklift using battery box ) 是由 刘贵生 王天旭 姚亮 于 2019-08-30 设计创作，主要内容包括：一种电动叉车的电池箱及使用该电池箱的电动叉车,包括箱体、设在所述箱体内的电池模组和电控组件,所述电池模组与所述电控组件电连接,所述箱体包括相对设置的底板和顶板、以及连接所述底板和所述顶板的多个侧板,所述底板与多个所述侧板之间、相邻的两个侧板之间、所述顶板与多个所述侧板之间均通过螺栓连接。按照本发明提供的电动叉车的电池箱与现有技术相比具有如下优点：本发明中的电池箱结构简单、装配方便,箱体采用厚的板材,可以直接在板材的端面开设螺纹孔,使箱体为拼装式的组装结构,各板面之间通过螺栓连接,解决了现有技术中焊接箱体工序多、时间长,焊接加工密封性要求严格、导致焊接成本较高的问题。(The utility model provides an electric fork lift's battery box and use electric fork lift of this battery box, includes the box, establishes battery module and automatically controlled subassembly in the box, the battery module with automatically controlled subassembly electricity is connected, the box is including relative bottom plate and the roof that sets up and connection the bottom plate with a plurality of curb plates of roof, the bottom plate is with a plurality of between the curb plate, between two adjacent curb plates the roof is with a plurality of all through bolted connection between the curb plate. Compared with the prior art, the battery box of the electric forklift provided by the invention has the following advantages: the battery box is simple in structure and convenient to assemble, the box body is made of thick plates, the threaded holes can be directly formed in the end faces of the plates, the box body is of an assembled structure, and the plate faces are connected through bolts, so that the problems that in the prior art, the box body is welded in multiple processes, the time is long, the requirement on welding processing tightness is strict, and the welding cost is high are solved.)

1. The utility model provides an electric fork-lift's battery box, includes the box, establishes battery module and automatically controlled subassembly in the box, the battery module with automatically controlled subassembly electricity is connected, its characterized in that: the box body comprises a bottom plate, a top plate and a plurality of side plates, wherein the bottom plate and the top plate are arranged oppositely, the side plates are connected with each other, the bottom plate is connected with the side plates through bolts, the top plate is connected with the side plates through bolts, and the thickness of the bottom plate is 15-30 mm.

2. The battery box of an electric forklift according to claim 1, characterized in that: the combination surfaces of the bottom plate and the side plates, the combination surfaces of the two adjacent side plates, and the combination surfaces of the top plate and the side plates are provided with first sealing strips.

3. The battery box of an electric forklift according to claim 1, characterized in that: the bottom plate and the side plates are both made of thick steel plates with the thickness of 15mm-30mm as base materials.

4. The battery box of an electric forklift according to claim 1, characterized in that: the roof is provided with a maintenance window, the periphery of the outer side of the maintenance window is provided with a window frame, and the roof further comprises a window cover matched with the window frame.

5. The battery box of an electric forklift according to claim 1, characterized in that: the bottom plate and the top plate are square, the number of the side plates is four, the side plates are respectively a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate is opposite to the third side plate, the second side plate is opposite to the fourth side plate, the first side plate, the second side plate, the third side plate and the fourth side plate are sequentially connected end to form a vertically through square cylinder, and the bottom plate and the top plate are respectively connected with an upper opening and a lower opening of the square cylinder.

6. The battery box of an electric forklift according to claim 5, characterized in that: the battery module comprises at least two battery modules, wherein a first supporting plate is arranged in the box body and is parallel to the bottom plate, two sides of the first supporting plate are connected with the two opposite side plates, and the battery modules are arranged on the bottom plate and the first supporting plate.

7. The battery box of an electric forklift according to claim 5, characterized in that: the box body is internally provided with a second supporting plate, the second supporting plate is parallel to the bottom plate, the distance between the second supporting plate and the top plate is smaller than the distance between the second supporting plate and the bottom plate, and the electric control assembly is arranged on the second supporting plate.

8. The battery box of an electric forklift according to claim 1, characterized in that: the electric control assembly comprises a charging relay, a discharging relay, a fuse, a Hall current sensor, a single chip microcomputer and a direct-current voltage converter.

9. The battery box of an electric forklift according to claim 8, characterized in that: the electronic control assembly further comprises a positioning module, a signal transmitting/receiving window is arranged on the top plate, the positioning module is opposite to the signal transmitting/receiving window, and a sealing cover is arranged on the signal transmitting/receiving window.

10. The utility model provides an electric fork-lift truck, includes frame, hoisting mechanism, motor, battery box, control system, its characterized in that: the battery box is the battery box of the electric forklift truck in any one of claims 1 to 9.

Technical Field

The invention relates to a battery box, in particular to a battery box of an electric forklift and an electric forklift using the battery box.

Background

In the era of rapid development of modern logistics storage, the forklift known as the spirit of transportation plays a great role in the field. In recent years, electric forklifts gradually enter the visual field of people and are more and more favored by users. Compared with an internal combustion engine forklift, the electric forklift has great advantages because the electric forklift does not generate waste gas emission, and has the advantages of ultralow noise and ultralow vibration while running; the electric steering system, the acceleration control system, the hydraulic control system and the brake system are controlled by electric signals, so that the labor intensity of operators is greatly reduced, and the working efficiency and the working accuracy of the operators are improved; the maintenance interval period of the electric forklift is long, the maintenance is rapid, and the cost is low.

At present, battery PACKs used in the electric forklift industry are mainly divided into two categories, namely a lead-acid battery PACK and a lithium battery PACK, wherein the traditional lead-acid power battery and the battery PACK are both manufactured into an open structure without a sealing cover due to the requirements of safety and cost; the lithium ion power battery with new energy has high energy density, does not generate acid gas, does not have memory effect, can be designed in a sealing way, has high integral protection performance, but has low maintenance convenience.

No matter which kind of battery PACK, the box frame has mainly been welded into to the thick steel plate that has adopted about 6mm, and the mode of assisting with the counter weight satisfies protection and use weight requirement to inside electric core again. In order to ensure the overall sealing performance, the welding box frame is processed by adopting a long-weld full-weld mode, which occupies the main part of the production and processing cost and is the step which consumes the longest time in each process; electric fork truck compares with internal-combustion engine fork truck simultaneously, does not have internal-combustion engine, gearbox etc. and its whole weight is generally lighter, takes place to overturn when avoiding electric fork truck to carry the material, and near battery installs the balancing weight additional again for general electric fork truck to guarantee electric fork truck's stability of operation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the assembled battery box of the electric forklift with the counter weight and the electric forklift using the battery box, which has the advantages of simple structure, easy assembly, low production cost and self-balance weight.

The battery box of the electric forklift provided by the invention adopts the main technical scheme that: including the box, establish battery module and automatically controlled subassembly in the box, the battery module with automatically controlled subassembly electricity is connected, the box is including relative bottom plate and the roof that sets up and connection the bottom plate with a plurality of curb plates of roof, the bottom plate is with a plurality of between the curb plate, between two adjacent curb plates roof and a plurality of all through bolted connection between the curb plate, the bottom plate is with a plurality of the thickness of side plate is 15mm-30 mm.

The battery box of the electric forklift also adopts the following auxiliary technical scheme:

the combination surfaces of the bottom plate and the side plates, the combination surfaces of the two adjacent side plates, and the combination surfaces of the top plate and the side plates are provided with first sealing strips.

The bottom plate and the side plates are both made of thick steel plates with the thickness of 15mm-30mm as base materials.

The roof is provided with a maintenance window, the periphery of the outer side of the maintenance window is provided with a window frame, and the roof further comprises a window cover matched with the window frame.

The window frame is provided with a plurality of electrical connectors, one ends of the electrical connectors are exposed outside the window frame, and the other ends of the electrical connectors are located inside the window frame and connected with the electric control assembly.

And a waterproof vent valve is arranged on the window frame.

The window cover is connected with the window frame through bolts.

And a second sealing strip is arranged on the joint surface of the window cover and the window frame.

The first sealing strip and the second sealing strip are silicon rubber sealing strips.

The silicon rubber sealing strip is a silicon rubber sealing strip with the thickness of 5 mm.

The bottom plate and the top plate are square, the number of the side plates is four, the side plates are respectively a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate is opposite to the third side plate, the second side plate is opposite to the fourth side plate, the first side plate, the second side plate, the third side plate and the fourth side plate are sequentially connected end to form a vertically through square cylinder, and the bottom plate and the top plate are respectively connected with an upper opening and a lower opening of the square cylinder.

The bolts include a first bolt, a second bolt, and a third bolt.

The periphery of the bottom plate is provided with a plurality of first threaded holes, a plurality of first bolt through holes are formed in the positions, close to the bottom edges, of the first side plate, the second side plate, the third side plate and the fourth side plate, the first bolt through holes are opposite to the first threaded holes one by one, and screws of the first bolts penetrate through the first bolt through holes to be matched with the first threaded holes.

The first curb plate with both ends all are equipped with a plurality of second screw holes about the third curb plate, the left and right sides of second curb plate and fourth curb plate all is equipped with a plurality of second bolt and perforates, and is a plurality of the second bolt is perforated with a plurality of the second screw hole one-to-one, the screw rod of second bolt passes the second bolt is perforated with the cooperation of second screw hole.

The top of first curb plate, the second curb plate, the third curb plate with the fourth curb plate all is equipped with a plurality of third screw holes, the roof is close to peripheral department and is equipped with a plurality of third bolt perforation, and is a plurality of the third bolt perforation is with a plurality of the third screw hole one-to-one, the screw rod of third bolt passes the third bolt perforation with the cooperation of third screw hole.

The first bolt through hole, the third bolt through hole and the third bolt through hole are all counter sunk holes.

The bolts are all high-strength bolts with the strength of more than 8.8 grades.

The battery module comprises at least two battery modules, wherein a first supporting plate is arranged in the box body and is parallel to the bottom plate, two sides of the first supporting plate are connected with the two opposite side plates, and the battery modules are arranged on the bottom plate and the first supporting plate.

The first supporting blocks are arranged on the first side plate and the third side plate respectively, and the first supporting plate presses against the two first supporting blocks and is connected with the two first supporting blocks.

The two first supporting blocks are respectively connected with the first side plate and the third side plate through bolts, and the first supporting plate is connected with the first supporting blocks through bolts.

The box body is internally provided with a second supporting plate, the second supporting plate is parallel to the bottom plate, the distance between the second supporting plate and the top plate is smaller than the distance between the second supporting plate and the bottom plate, and the electric control assembly is arranged on the second supporting plate.

The first side plate and the third side plate are respectively provided with a first supporting block and a second supporting block, the first supporting block and the second supporting block are respectively arranged on the first side plate and the third side plate, and the second supporting plate presses against the two second supporting blocks and is connected with the two second supporting blocks.

The two second supporting blocks are respectively connected with the first side plate and the third side plate through bolts, and the second supporting plate is connected with the second supporting block through bolts.

The electric control assembly comprises a charging relay, a discharging relay, a fuse, a Hall current sensor, a single chip microcomputer and a direct-current voltage converter.

The electronic control assembly further comprises a positioning module, a signal transmitting/receiving window is arranged on the top plate, the positioning module is opposite to the signal transmitting/receiving window, and a sealing cover is arranged on the signal transmitting/receiving window.

The seal cover is a plastic seal cover.

The electric forklift provided by the invention adopts the main technical scheme that: including frame, hoisting mechanism, motor, battery box, control system, the battery box includes the box, establishes battery module and automatically controlled subassembly in the box, the battery module with automatically controlled subassembly electricity is connected, the box is including relative bottom plate and the roof that sets up and connection the bottom plate with a plurality of curb plates of roof, the bottom plate is with a plurality of between the curb plate, between two adjacent curb plates roof and a plurality of all through bolted connection between the curb plate, the bottom plate is with a plurality of the thickness of side plate is 15mm-30 mm.

Compared with the prior art, the battery box of the electric forklift provided by the invention has the following advantages: the battery box has a simple structure and is convenient to assemble, the box body is made of plates with the thickness of 15mm-30mm, and threaded holes can be directly formed in the end faces of the plates, so that the box body is of an assembled structure, and the plate faces are connected through bolts, so that the problems that in the prior art, the box body is welded in multiple processes, the time is long, the requirement on welding processing tightness is strict, and the welding cost is high are solved; in addition, the assembled box body structure can be assembled by firstly installing internal components such as a battery module on the bottom plate and then gradually installing the side plates and the top plate, so that the whole assembly of the battery box is more flexible, and the assembly efficiency of a product is improved; the box body is made of plates with the thickness of 15mm-30mm, compared with a thin plate welding box body in the prior art, the weight of the battery box is greatly increased, the self-balancing weight of the electric forklift can be realized without additionally installing a balancing weight when the battery box is used on the electric forklift, the installation and fixing process of the balancing weight is omitted, and the assembly efficiency and the maintenance efficiency of the electric forklift are greatly improved.

Compared with the prior art, the electric forklift provided by the invention has the following advantages: the battery box has a simple structure and is convenient to assemble, the box body is made of plates with the thickness of 15mm-30mm, and threaded holes can be directly formed in the end faces of the plates, so that the box body is of an assembled structure, and the plate faces are connected through bolts, so that the problems that in the prior art, the box body is welded in multiple processes, the time is long, the requirement on welding processing tightness is strict, and the welding cost is high are solved; in addition, the assembled box body structure can be assembled by firstly installing internal components such as a battery module on the bottom plate and then gradually installing the side plates and the top plate, so that the whole assembly of the battery box is more flexible, and the assembly efficiency of a product is improved; the box body is made of plates with the thickness of 15mm-30mm, compared with a thin plate welding box body in the prior art, the weight of the battery box is greatly increased, when the battery box is used on the electric forklift, the self-balancing weight of the electric forklift can be realized without additionally installing a balancing weight, the installation and fixing process of the balancing weight is omitted, and the assembly efficiency and the maintenance efficiency of the electric forklift are greatly improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an exploded view of a battery box of the electric forklift according to the present invention.

Fig. 2 is a structural view of a battery box of the electric forklift according to the present invention.

Fig. 3 is a structural view of the battery box of the electric forklift of the present invention with the top plate removed.

Fig. 4 is an exploded view of the battery box of the electric forklift of the present invention with the top plate removed.

Fig. 5 is a sectional view of a battery box of the electric forklift according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Referring to fig. 1 to 5, the embodiment of the battery box of the electric forklift provided by the invention comprises a box body, a battery module 3 and an electric control assembly, wherein the battery module 3 and the electric control assembly are arranged in the box body, the box body comprises a bottom plate 11 and a top plate 12 which are oppositely arranged, and a plurality of side plates for connecting the bottom plate 11 and the top plate 12, the bottom plate 11 and the plurality of side plates, two adjacent side plates and the top plate 12 and the plurality of side plates are connected through bolts, and the thicknesses of the bottom plate 11 and the plurality of side plates are 15mm-30 mm. This embodiment is preferably 30 mm. The battery box has a simple structure and is convenient to assemble, the box body is made of plates with the thickness of 15mm-30mm, and threaded holes can be directly formed in the end faces of the plates, so that the box body is of an assembled structure, and the plate faces are connected through bolts, so that the problems that in the prior art, the box body is welded in multiple processes, the time is long, the requirement on welding processing tightness is strict, and the welding cost is high are solved; in addition, the assembled box body structure can be assembled by firstly installing internal components such as the battery module 3 on the bottom plate 11 and then gradually installing the side plates and the top plate 12, so that the overall assembly of the battery box is more flexible, and the assembly efficiency of products is improved; the box body is made of plates with the thickness of 15mm-30mm, compared with a thin plate welding box body in the prior art, the weight of the battery box is greatly increased, the self-balancing weight of the electric forklift can be realized without additionally installing a balancing weight when the battery box is used on the electric forklift, the installation and fixing process of the balancing weight is omitted, and the assembly efficiency and the maintenance efficiency of the electric forklift are greatly improved.

Referring to fig. 1 and 4, according to the above-mentioned embodiment of the present invention, the combination surfaces of the bottom plate 11 and the plurality of side plates, the combination surfaces of two adjacent side plates, and the combination surfaces of the top plate 12 and the side plates are provided with first sealing strips 21. The arrangement of the first sealing strip 21 improves the sealing performance of the box body again, the shell protection level of IP68 can be achieved, meanwhile, the arrangement of the first sealing strip 21 can reduce the requirement on the flatness of each plate surface of the box body, the requirement on the production process of each plate surface is reduced, and the reduction of the production cost of the battery box is facilitated.

Referring to fig. 1 to 5, according to the above-described embodiment of the present invention, the bottom plate 11 and the plurality of side plates are each made of a thick steel plate of 15mm to 30mm as a base material. By adopting the base material, the box body has high mechanical strength, good flatness, heavy weight and low cost.

Referring to fig. 1, 2 and 5, according to the above-mentioned embodiment of the present invention, the top plate 12 is provided with a maintenance window, the outer periphery of which is provided with a window frame 17, and a window cover 18 engaged with the window frame 17. The arrangement of the maintenance window facilitates the daily maintenance and overhaul of the battery box, improves the maintenance efficiency and shortens the maintenance time.

Referring to fig. 1, 2 and 5, according to the above-mentioned embodiment of the present invention, the window frame 17 is provided with a plurality of electrical connectors 81, one end of each electrical connector 81 is exposed outside the window frame 17, and the other end is located inside the window frame 17 and connected to the electronic control component. The window cover 18 is bolted to the window frame 17. The assembly is convenient and the connection is reliable. The electrical connector 81 is skillfully arranged on the window frame 17, so that the occupied space of the battery box cannot be expanded under the condition that the electrical connector 81 is normally connected with a circuit of the electric forklift, and the electrical connector 81 is not easy to touch in the process of carrying the battery box, so that the safety and the reliability of a product are ensured.

Referring to fig. 1 and 2, according to the above-mentioned embodiment of the present invention, the window frame 17 is provided with a waterproof air-permeable valve 82. When the temperature in the box body rises and the air pressure is large, the pressure difference between the inside and the outside of the box body can be balanced through the waterproof ventilation valve 82. The waterproof vent valve 82 is arranged on the window frame 17, so that dust accumulation and water drop blockage are avoided, and the reliability of the waterproof vent valve 82 is ensured.

Referring to fig. 1, according to the above-mentioned embodiment of the present invention, the joint surface of the window cover 18 and the window frame 17 is provided with a second sealing strip 22. The second sealing strip 22 improves the sealing performance of the box body again, the protection level of the shell of IP68 can be reached, meanwhile, the second sealing strip 22 can reduce the flatness requirement of the window frame 17 and the window cover 18, the production process requirement of the combined surface of the window frame 17 and the window cover 18 is reduced, and the production cost of the battery box is reduced.

Referring to fig. 1 and 4, according to the above-described embodiment of the present invention, the first sealing tape 21 and the second sealing tape 22 are silicone rubber sealing tapes. The silicon rubber sealing strip is a silicon rubber sealing strip with the thickness of 5 mm. The silicon rubber sealing strip is soft, elastic, high-temperature resistant, low-temperature resistant, not easy to age, non-deformable, resistant to slight acid and alkali, good in ozone resistance, solvent resistance and electrical insulation, and very suitable for the battery box.

Referring to fig. 1 to 5, according to the above-mentioned embodiment of the present invention, the bottom plate 11 and the top plate 12 are both square, the number of the side plates is four, and the side plates are respectively a first side plate 13, a second side plate 14, a third side plate 15 and a fourth side plate 16, the first side plate 13 is opposite to the third side plate 15, the second side plate 14 is opposite to the fourth side plate 16, the first side plate 13, the second side plate 14, the third side plate 15 and the fourth side plate 16 are sequentially connected end to form a vertically through square cylinder, and the bottom plate 11 and the top plate 12 are respectively connected to the upper opening and the lower opening of the square cylinder. The box body can be a cuboid or a cube, and the cuboid is preferred in the embodiment. Simple structure, few parts, easy assembly, regular appearance and convenient transportation.

The bolts include a first bolt, a second bolt, and a third bolt. A plurality of first threaded holes 51 are formed in the periphery of the bottom plate 11, a plurality of first bolt through holes 61 are formed in the positions, close to the bottom edges, of the first side plate 13, the second side plate 14, the third side plate 15 and the fourth side plate 16, the first bolt through holes 61 are opposite to the first threaded holes 51 one by one, and screws of the first bolts penetrate through the first bolt through holes 61 to be matched with the first threaded holes 51.

The left end and the right end of the first side plate 13 and the third side plate 15 are both provided with a plurality of second threaded holes 52, the left end and the right end of the second side plate 14 and the fourth side plate 16 are both provided with a plurality of second bolt through holes 62, the second bolt through holes 62 are opposite to the second threaded holes 52 one by one, and screws of the second bolts penetrate through the second bolt through holes 62 to be matched with the second threaded holes 52.

The top ends of the first side plate 13, the second side plate 14, the third side plate 15 and the fourth side plate 16 are all provided with a plurality of third threaded holes 53, the top plate 12 is provided with a plurality of third bolt through holes 63 near the periphery, the third bolt through holes 63 are one-to-one opposite to the third threaded holes 53, and screws of the third bolts penetrate through the third bolt through holes 63 to be matched with the third threaded holes 53.

The top plate 12, the bottom plate 11, the first side plate 13, the second side plate 14, the third side plate 15 and the fourth side plate 16 are assembled in the above mode, the box body is high in mechanical strength and convenient to assemble, any plate surface except the bottom plate 11 can be assembled finally according to the condition of components in the box body, and the box body is high in assembly flexibility and good in stability.

The first bolt penetration hole 61, the third bolt penetration hole 63, and the third bolt penetration hole 63 are counterbores. After the assembly is completed, the heads of the first bolt, the second bolt and the third bolt are positioned in the counter bores, so that the outer portion of the box body is very flat. The bolts are all high-strength bolts with the strength of more than 8.8 grades.

Referring to fig. 1, 3 to 5, according to the above embodiment of the present invention, there are at least two battery modules 3, a first supporting plate 71 is disposed in the box, the first supporting plate 71 is parallel to the bottom plate 11, two sides of the first supporting plate 71 are connected to two opposite side plates, and the battery modules 3 are disposed on both the bottom plate 11 and the first supporting plate 71. The side plates of the battery box are made of thick steel plate base materials of 15mm-30mm, the first supporting plate 71 is supported by the two opposite side plates, the mechanical strength is very high, and the bearing capacity is strong, so that the double-layer arrangement of the battery modules 3 can be realized, and under the condition that the bottom area of the battery box of the battery forklift is fixed and the height is allowed, the battery capacity can be ensured by adopting the structure to enlarge the number of the battery modules 3 of the single battery box, and the application range of the battery box is greatly enlarged.

A second supporting plate 72 is arranged in the box body, the second supporting plate 72 is parallel to the bottom plate 11, the distance between the second supporting plate 72 and the top plate 12 is smaller than the distance between the second supporting plate 72 and the bottom plate 11, and the electric control assembly is arranged on the second supporting plate 72. The electric control assembly comprises a charging relay 41, a discharging relay 42, a fuse 43, a hall current sensor 44, a single chip microcomputer 45 and a direct-current voltage converter 46. The structure and connection of the electric control assembly are mature technologies in the prior art, and are not described in detail here. The arrangement of the second supporting plate 72 facilitates the installation and fixation of the electric control assembly, and compared with the existing junction box form, the arrangement of the second supporting plate facilitates the improvement of the heat dissipation efficiency of the electric control assembly.

The first supporting blocks 73 are arranged on the first side plate 13 and the third side plate 15 respectively, and the first supporting plate 71 presses against the first supporting blocks 73 and is connected with the first supporting blocks 73. The two first supporting blocks 73 are respectively connected with the first side plate 13 and the third side plate 15 through bolts, and the first supporting plate 71 is connected with the first supporting blocks 73 through bolts. The two second supporting blocks 74 are respectively arranged on the first side plate 13 and the third side plate 15, and the second supporting plate 72 presses against the two second supporting blocks 74 and is connected with the two second supporting blocks 74. The two second supporting blocks 74 are respectively connected with the first side plate 13 and the third side plate 15 through bolts, and the second supporting plate 72 is connected with the second supporting block 74 through bolts.

The first supporting plate 71 and the second supporting plate 72 are fixed in the box body by adopting the structure, so that the assembly is convenient, the stability is good, the effect of supporting a cross beam is achieved in the box body, and the mechanical strength and the stability of the box body are improved again; the base materials of the first supporting plate 71, the first supporting block 73 and the second supporting block 74 are the same as those of the box bottom plate 11 and the side plates, so that the rigidity and the strength are ensured, the types of raw materials are reduced, and the production cost is reduced to a certain extent.

Referring to fig. 1 to 5, according to the above-mentioned embodiment of the present invention, the electronic control assembly further includes a positioning module 47, a signal transmitting/receiving window 121 is disposed on the top plate 12, the positioning module 47 is opposite to the signal transmitting/receiving window 121, and a cover 122 is disposed on the signal transmitting/receiving window 121. The cover 122 is a plastic cover 122. The arrangement of the signal transmitting/receiving window 121 ensures the stable transmission of the signal of the positioning module 47, the arrangement of the sealing cover 122 keeps the sealing performance of the battery box, and the plastic sealing cover 122 avoids the interference or shielding phenomenon to the signal.

The embodiment of the electric forklift provided by the invention comprises a frame, a hoisting mechanism, a motor, a battery box and a control system, wherein the frame, the hoisting mechanism, the motor and the control system are mature technologies in the prior art, and are described in detail herein, and the battery box in the embodiment is the battery box in the embodiment. The battery box has a simple structure and is convenient to assemble, the box body is made of plates with the thickness of 15mm-30mm, and threaded holes can be directly formed in the end faces of the plates, so that the box body is of an assembled structure, and the plate faces are connected through bolts, so that the problems that in the prior art, the box body is welded in multiple processes, the time is long, the requirement on welding processing tightness is strict, and the welding cost is high are solved; in addition, the assembled box body structure can be assembled by firstly installing internal components such as the battery module 3 on the bottom plate 11 and then gradually installing the side plates and the top plate 12, so that the overall assembly of the battery box is more flexible, and the assembly efficiency of products is improved; the box body is made of plates with the thickness of 15mm-30mm, compared with a thin plate welding box body in the prior art, the weight of the battery box is greatly increased, when the battery box is used on the electric forklift, the self-balancing weight of the electric forklift can be realized without additionally installing a balancing weight, the installation and fixing process of the balancing weight is omitted, and the assembly efficiency and the maintenance efficiency of the electric forklift are greatly improved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.