Lithium iron phosphate battery pack of tricycle

Abstract

The utility model relates to a tricycle lithium iron phosphate battery pack and belongs to the technical field of battery packs. Comprising a lower shell, blade battery cells, an upper cover and pressing strips, the blade battery cells are stacked into three modules, insulating plates are arranged among the three modules, the modules are sleeved with an upper end plate and a lower end plate respectively, and the upper end plate and the lower end plate are fixedly connected; the upper end plate and the lower end plate are in an n shape and an inverted n shape respectively, grooves are formed in the top of the upper end plate and the bottom of the lower end plate respectively, and reinforcing blocks are arranged in the grooves. A limiting frame is arranged at the top of the lower shell, the limiting frame is of a necking design, a limiting assembly and a first fixing plate are arranged on the lower shell, and the limiting assembly is located in the lower shell and linearly distributed. The utility model provides a lithium iron phosphate battery pack for a tricycle, which is used for restraining the expansion of a battery cell, limiting the displacement of a battery module, reducing the deformation of an upper cover caused by external force and firmly and reliably fixing the battery cell and the module.

Description

Technical Field

[0001] The utility model relates to a lithium iron phosphate battery pack for a tricycle, belonging to the technical field of battery packs. Background Art

[0002] A battery module generally refers to a combination of cells connected in series or in parallel, which can provide electrical energy after being fixed. It is one of the secondary structures that make up a power battery pack. According to the structural shape of the cells, the current tricycle battery pack cells use square aluminum shell lithium iron phosphate cells, lead-acid batteries or cylindrical cells.

[0003] Battery shells are mainly divided into: 1. Plastic shell; 2. Die-cast aluminum or aluminum profile shell; 3. Sheet metal shell, among which sheet metal shell is divided into sheet metal spray-painted shell and stainless steel natural color shell.

[0004] As the energy density of battery modules increases, the vehicle system has put forward higher requirements for cycle performance and safety performance of battery modules. The traditional battery shell is generally composed of a top cover, a shell and an end plate. It has poor stability and is easily deformed by the expansion force of the module, which cannot meet the size requirements. Utility Model Content

[0005] In view of this, the utility model provides a lithium iron phosphate battery pack for a tricycle, which restrains the expansion of the battery cell when in use, limits the displacement of the battery module, reduces the deformation of the upper cover due to external forces, and firmly and reliably fixes the battery cell and the module.

[0006] The utility model provides a lithium iron phosphate battery pack for a tricycle, which comprises a lower shell, a blade battery cell, an upper cover, and a pressure strip, wherein the blade battery cells are stacked into three modules, the three modules are spaced by a first insulating plate, a second insulating plate is provided between the upper and lower ends of the three modules, and a third insulating plate is provided on both sides of the three modules, the modules are respectively inserted into an upper end plate and a lower end plate, and the upper end plate and the lower end plate are fixedly connected;

[0007] The upper end plate and the lower end plate are in a "ㄇ" shape and an inverted "ㄇ" shape respectively, and grooves are respectively provided on the top of the upper end plate and the bottom of the lower end plate, and reinforcement blocks are provided in the grooves;

[0008] A limit frame is provided on the top of the lower shell, and the limit frame is designed as a constricted opening. A limit component and a first fixing plate are provided on the lower shell, and the limit component is linearly distributed in the lower shell.

[0009] Preferably, both sides of the upper end plate and the lower end plate are provided with bent platform surfaces, the upper platform surface of the upper end plate is provided with a riveted nut, and the platform surface of the lower end plate is provided with a first through hole corresponding to the riveted nut, and the upper end plate and the lower end plate are fixed by riveting screws.

[0010] Preferably, a second through hole fixedly connected to the lower shell is provided on the platform surface of the upper end plate and the lower end plate, and the second through hole is a waist-shaped hole.

[0011] Preferably, a plurality of second fixing plates are provided on both sides above the upper end plate, the pressure strip is located on the second fixing plates, and the pressure strip and the second fixing plates are fixedly connected to the lower shell by first screws.

[0012] Preferably, a plurality of limit assemblies are provided in the lower shell, and the plurality of limit assemblies are arranged linearly. The limit assemblies include a cross beam and a fixed block. The fixed block is located on both sides of the cross beam and is fixedly connected to the cross beam. A threaded hole corresponding to the first screw is provided on the top of the fixed block.

[0013] Preferably, both ends of the upper end plate and the lower end plate are provided with a first limiting plate corresponding to the third insulating plate, and the first limiting plate is fixed to the third insulating plate by a second screw.

[0014] Preferably, the upper cover corresponds to the limiting frame, a plurality of threaded holes are provided on the side of the upper cover and fixedly connected to the limiting frame by third screws, and a fourth insulating plate is provided on the top of the inner wall of the upper cover.

[0015] Preferably, it also includes an insulating film, a power output wiring harness, a connecting piece, a BMS protection board, and a waterproof PG head. The pole surfaces at both ends of the three modules are welded in series through the connecting piece in sequence, and are connected to the power output wiring harness and the BMS protection board and then covered with the insulating film.

[0016] Preferably, the waterproof PG head is installed on the lower shell.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a lithium iron phosphate battery pack for a tricycle. When in use, a blade battery cell is wrapped by an upper end plate and a lower end plate, which are fastened with screws to restrict expansion of the battery cell. The upper and lower end plates are connected to an outer shell with screws to limit displacement of a battery module. The upper end plate, the lower end plate and the lower shell of the battery module are fixed to form a whole, ensuring that the module does not displace during vibration and drop tests of the battery. Finally, a pressure strip is added to the upper surface of the module to press the module tightly, reducing deformation of the upper cover due to external force, and fixing the battery cell and the module firmly and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the overall explosion structure of a lithium iron phosphate battery pack for a tricycle.

[0020] Figure 2 The utility model is a schematic diagram of the lower end plate structure of a lithium iron phosphate battery pack for a tricycle.

[0021] Figure 3The utility model is a schematic diagram of the upper end plate structure of a lithium iron phosphate battery pack for a tricycle.

[0022] Figure 4 The utility model is a schematic diagram of the lower shell structure of a lithium iron phosphate battery pack for a tricycle.

[0023] Figure 5 This is a schematic diagram of the second steering rod structure of a lithium iron phosphate battery pack for a tricycle according to the utility model.

[0024] (1, lower shell, 2, blade battery, 3, upper cover, 4, pressure strip, 5, upper end plate, 6, lower end plate, 7, waterproof PG head, 8, limit frame, 9, platform surface, 10, riveted nut, 11, first through hole, 12, first fixing plate, 13, second fixing plate, 14, reinforcement block, 15, crossbeam, 16, fixing block, 17, first limit plate, 18, insulation film, 19, BMS protection plate, 20, third insulation plate, 21, power output harness, 22, connecting piece, 23 fourth insulation plate) DETAILED DESCRIPTION

[0025] The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

[0026] As shown in the figure, the utility model provides a lithium iron phosphate battery pack for a tricycle, which includes a lower shell 1, a blade battery cell 2, an upper cover 3, a pressure strip 4, an insulating film 18, a power output harness 21, a connecting piece 22, a BMS protection plate 19, and a waterproof PG head 7, characterized in that: the blade battery cells 2 are stacked into three modules, the three modules are spaced apart by a first insulating plate, a second insulating plate is provided between the upper and lower ends of the three modules, and a third insulating plate 20 is provided on both sides of the three modules to prevent sheet metal burrs from piercing the battery cell insulating film, and the modules are respectively inserted into an upper end plate 5 and a lower end plate 6, and the upper end plate 5 and the lower end plate 6 are spaced apart by a first insulating plate. The three modules are fixedly connected to each other to prevent the battery core from expanding. The pole surfaces at both ends of the three modules are welded in series with connecting pieces in sequence, and the power output harness 21 and the BMS protection plate 19 are installed. Then the third insulating plate 20 is fixed with screws, and the heat shrink film 18 is inserted to ensure that the connecting piece 22, the power output harness 21 and other live components are well insulated from the outer shell sheet metal. The assembled battery module is placed into the lower shell 1 along the fixing block of the lower shell 1, and the battery module is fixed on the fixing block 16 and the first fixing plate 12 in the long side direction of the lower shell 1, and then the locking pressure strip 4 is pressed at the upper end of the module to press the module, and at the same time, the upper end of the pressure strip 4 is in contact with the upper end plate 5 to reinforce and support the upper cover 3;

[0027] The upper end plate 5 and the lower end plate 6 are in a "ㄇ" shape and an inverted "ㄇ" shape respectively. The top of the upper end plate 5 and the bottom of the lower end plate 6 are respectively provided with grooves, and the grooves are provided with reinforcement blocks 14;

[0028] The upper and lower end plates 5 and 6 are provided with a first limit plate 17 corresponding to the third insulating plate 20 at both ends, and the first limit plate 17 and the third insulating plate 20 are fixed by a second screw to realize the insulation of the conductive components of the battery module and the shell sheet metal. The upper and lower end plates 5 and 6 are provided with a bent platform surface 9 on both sides, and the upper platform surface 9 of the upper end plate 5 is provided with a rivet nut 10, and the upper platform surface 9 of the lower end plate 6 is provided with a first through hole 11 corresponding to the rivet nut 10. When in use, the rivet screw passes through the first through hole 11 and is fixed with the rivet nut 10 to ensure that the battery module enters the shell smoothly and the relative position of the battery module and the lower shell 1 is accurate. The upper and lower end plates 5 and 6 are provided with a second through hole fixedly connected to the lower shell, and the second through hole is a waist-shaped hole. The screw passes through the second through hole and is fixed to the lower shell 1. The waist-shaped hole is convenient for adjusting the position;

[0029] A limit frame 8 is provided on the top of the lower shell 1, and the limit frame 8 is a constricted design. A plurality of limit components and a first fixed plate 12 are provided on the lower shell 1. The plurality of limit components are linearly arranged, and the limit components include a cross beam 15 and a fixed block 16. The fixed block 16 is located on both sides of the cross beam 15 and is fixedly connected to the cross beam 15. The cross beam 15 is used to support the battery module so that the module connecting piece 22 maintains a sufficient safety distance from the lower shell 1 and increases the bottom strength of the lower shell 1. A threaded hole corresponding to the first screw is provided on the top of the fixed block 16, and the first screw is used to penetrate the pressure strip 4, the second fixed plate 13 and the fixed block 16 in sequence for fixing, which also plays a role in positioning the battery module; the bottom of the battery module is fixed by the first fixed plate 12 fixedly welded at the bottom;

[0030] Two circular holes are provided at the front end of the lower shell 1 for installing the waterproof PG head 7 and fixing the led-out power output harness 21; a limit frame 8 with a shrinking design is provided on the top of the lower shell to increase the sheet metal strength of the lower shell 1 and make the connection with the upper cover 3 smoother and more beautiful; the limit frame 8 is fixed to the upper cover 3 by screws, and a non-stick insulating plate is provided on the inner wall of the upper cover 3 to achieve insulation of the upper cover 3.

[0031] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A lithium iron phosphate battery pack for a tricycle, comprising a lower shell (1), a blade battery cell (2), an upper cover (3), and a pressure strip (4), characterized in that: The blade cells (2) are stacked into three modules, the three modules are spaced apart by a first insulating plate, a second insulating plate is provided between the upper and lower ends of the three modules, and third insulating plates (20) are provided on both sides of the three modules, the modules are respectively inserted into an upper end plate (5) and a lower end plate (6), and the upper end plate (5) and the lower end plate (6) are fixedly connected; The upper end plate (5) and the lower end plate (6) are respectively in a "ㄇ" shape and an inverted "ㄇ" shape, and grooves are respectively provided at the top of the upper end plate (5) and the bottom of the lower end plate (6), and reinforcement blocks (14) are provided in the grooves; A limit frame (8) is provided on the top of the lower shell (1), and the limit frame (8) is of a constricted design. A limit component and a first fixing plate (12) are provided on the lower shell (1), and the limit component is linearly distributed in the lower shell (1).

2. A lithium iron phosphate battery pack for tricycles according to claim 1, characterized in that: The upper end plate (5) and the lower end plate (6) are both provided with a bent platform surface (9), the upper platform surface (9) of the upper end plate (5) is provided with a riveted nut (10), and the upper platform surface (9) of the lower end plate (6) is provided with a first through hole (11) corresponding to the riveted nut (10), and the upper end plate (5) and the lower end plate (6) are fixed by riveted screws.

3. A tricycle lithium iron phosphate battery pack according to claim 1, characterized in that: The upper platform surfaces (9) of the upper end plate (5) and the lower end plate (6) are provided with second through holes fixedly connected to the lower shell, and the second through holes are waist-shaped holes.

4. A lithium iron phosphate battery pack for tricycles according to claim 1, characterized in that: A plurality of second fixing plates (13) are provided on both sides above the upper end plate (5), the pressure strip (4) is located on the second fixing plates (13), and the pressure strip (4) and the second fixing plates (13) are fixedly connected to the lower shell (1) by means of first screws.

5. A lithium iron phosphate battery pack for tricycles according to claim 4, characterized in that: A plurality of limit assemblies are arranged in the lower shell (1), and the plurality of limit assemblies are arranged linearly. The limit assemblies include a cross beam (15) and a fixing block (16). The fixing block (16) is located on both sides of the cross beam (15) and is fixedly connected to the cross beam (15). A threaded hole corresponding to the first screw is provided on the top of the fixing block (16).

6. A tricycle lithium iron phosphate battery pack according to claim 1, characterized in that: Both ends of the upper end plate (5) and the lower end plate (6) are provided with a first limiting plate (17) corresponding to the third insulating plate (20), and the first limiting plate (17) and the third insulating plate (20) are fixed by a second screw.

7. A lithium iron phosphate battery pack for a tricycle according to claim 1, characterized in that: The upper cover (3) corresponds to the limiting frame (8); a plurality of threaded holes are provided on the side of the upper cover (3) and are fixedly connected to the limiting frame (8) by third screws; a fourth insulating plate (23) is provided on the top of the inner wall of the upper cover.

8. The lithium iron phosphate battery pack for tricycle according to claim 1, characterized in that: It also includes an insulating film (18), a power output harness (21), a connecting piece (22), a BMS protection board (19), and a waterproof PG head (7). The pole surfaces at both ends of the three modules are welded in series in sequence through the connecting piece (22), and are connected to the power output harness (21) and the BMS protection board (19) and then inserted into the insulating film (18).

9. A lithium iron phosphate battery pack for a tricycle according to claim 8, characterized in that: The waterproof PG head (7) is mounted on the lower shell (1).

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