Lithium battery for two-wheeled electric vehicle

Abstract

The lithium battery comprises a box body lower barrel, a box cover, a battery lifting handle, a 4G plastic cover, a 6 + 2 connector, an audio cable connector, a module lifting lug, a module pressing beam, a battery cell module and a battery management system BMS, the battery cell module is arranged in the box body lower barrel, the module lifting lug is fixedly connected to the side face of the inner wall of the box body lower barrel, and the module lifting lug is fixedly connected to the side face of the inner wall of the box body lower barrel. Module lifting lugs are arranged on the box body lower barrel, module pressing beams are installed on the module lifting lugs through bolts, the module pressing beams press the battery cell modules, studs are riveted to the module pressing beams, a battery management system (BMS) is installed on the module pressing beams, a box cover is connected to the box body lower barrel, and a 6 + 2 connector, an audio cable connector and a 4G plastic cover are sequentially and fixedly connected to the box cover, so that a bicycle battery system structure is formed. According to the 48V-72V lithium battery disclosed by the utility model, on the premise of ensuring the product quality and the durable service life, the technical cost can be reduced by optimizing the internal structure of the battery, reducing the purchase cost of parts and improving the assembly efficiency of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a lithium battery for a two-wheeled electric vehicle. Background Art

[0002] With the rapid development of new energy power battery technology, the price of lithium battery cells has gradually decreased with the scale effect. Lithium batteries have gradually been used in industries such as shared bicycle batteries, takeaway bicycle batteries, and battery replacement and leasing due to their own advantages in energy density and cycle life. However, the price of lithium batteries is still relatively high compared to lead-acid batteries, so it is necessary to develop a relatively low-cost structural design for two-wheeled electric vehicle lithium batteries. Prior to this, there have been extruded aluminum shell bicycle lithium batteries on the market, with a module design of laser-welded end plates and a thermal management system with PTC heating and built-in fans. The structure is complex and does not significantly improve battery performance, so it does not have a competitive advantage in the bicycle lithium battery market. The patent document with authorization announcement number CN 210778849 U discloses a lithium battery for an electric vehicle, including a lithium battery cavity for an electric vehicle, a first slide groove is opened on the front and rear sides of the lower end of the lithium battery cavity for an electric vehicle, a lithium battery is movably placed inside the lithium battery cavity for an electric vehicle, rollers are fixedly connected to the four corners of the lower end of the lithium battery, the lower part of the roller is inserted into the first slide groove, the lower part of the left end of the lithium battery cavity for an electric vehicle is connected to a first cover plate through a connecting shaft, a fastening screw is threadedly inserted in the middle of the upper and lower sides of the first cover plate, a second slide groove is opened on the front and rear sides of the right end of the first cover plate, and a protective plate is fixedly connected to the upper end of the lithium battery, and threaded holes are opened on the left and right sides of the protective plate. The patent document with authorization announcement number CN 213905497 U discloses a lithium battery for a two-wheeled electric bicycle, including a battery body, a protective shell and a shell cover, wherein the battery body is in a strip-shaped structure as a whole, a placement groove is provided in the protective shell, the battery body is arranged in the placement groove, the shell cover and the top of the protective shell are hinged to each other, and the protective shell is fixedly arranged on the electric bicycle; a sink groove is provided on the top of the battery body, a charging hole is provided in the sink groove, a power supply head is provided on the side of the protective shell, and the power supply head is electrically connected to the power supply port of the battery body; strip-shaped guide belts are provided on both sides of the battery body, and guide grooves are correspondingly provided on both sides of the placement groove, and the guide belts and the guide grooves are clamped to each other.

[0003] In order to enhance the competitive advantage of current bicycle lithium batteries in the market, relevant bicycle lithium battery manufacturers need to re-optimize the current lithium battery structure, remove redundant components that cannot significantly improve battery performance, and seek technical cost reduction. Utility Model Content

[0004] The utility model aims to overcome the deficiencies in the prior art and provide a lithium battery for a two-wheeled electric vehicle, thereby reducing the number of internal parts of the battery, simplifying the assembly process, and improving the competitive advantage of this type of lithium battery in the market.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a lithium battery for a two-wheeled electric vehicle, including a lower barrel of a box body, a box cover, a battery handle, a 4G plastic cover, a 6+2 connector, an audio line connector, a module lifting ear, a module pressure beam, a battery module and a battery management system BMS. The battery module is placed in the lower barrel of the box body, and the module lifting ear is fixedly connected to the side of the inner wall of the lower barrel of the box body. The module lifting ear is installed with a module pressure beam through bolts, and the module pressure beam presses the battery module. Studs are riveted on the module pressure beam and a battery management system BMS is installed. The lower barrel of the box body is connected to the box cover, and the box cover is sequentially fixed with a 6+2 connector, an audio line connector and a 4G plastic cover to form a single-vehicle battery system structure.

[0006] Furthermore, the battery lower barrel is formed by an integrated stretching process of low-carbon steel Q235.

[0007] Furthermore, a hard flame-retardant foam for limiting the position of the battery cell module is pasted on the inner wall side of the lower barrel of the box body.

[0008] Furthermore, a sealing gasket is provided between the battery lower barrel and the box cover to increase the air tightness of the battery.

[0009] Furthermore, the box cover is in the shape of two steps, the upper step is equipped with a battery handle, and the lower step is equipped with a 6+2 connector, an audio cable connector and a 4G plastic cover in sequence. The box cover is formed in one piece by die-cast aluminum.

[0010] Furthermore, the battery cell module is formed by winding a plurality of single battery cells with glass fiber tape or fixing them with brackets.

[0011] Furthermore, the 6+2 connector and the audio line connector are connected in parallel inside the battery.

[0012] Beneficial effects: Compared with the existing technology, the 48V-72V lithium battery of the utility model can remove redundant components that cannot significantly improve battery performance while ensuring product quality and durable life. It can achieve technical cost reduction by optimizing the internal structure of the battery, reducing the cost of parts procurement, and improving battery assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the battery module (taking the square shell battery as an example);

[0015] Figure 3Module pressure beam and battery management system BMS circuit board installation view.

[0016] In the picture: 1. Box lower barrel, 2. Upper cover, 3. Battery handle, 4. 4G plastic cover, 5. 6+2 connector, 6. Audio cable connector, 7. Box lifting ear, 8. Module pressure beam, 9. Battery cell module, 10. Battery management system BMS, 11. Hard flame retardant foam block. DETAILED DESCRIPTION

[0017] The following is a detailed description of the specific implementation methods provided by the utility model in combination with the preferred embodiments: Figures 1 to 3 The present embodiment provides a 48V-72V lithium battery structure design for a two-wheeled electric vehicle, including a battery lower barrel 1, a battery cell module 9 is placed in the battery lower barrel 1, a box body hanging ear 7 is welded and fixed inside the battery lower barrel 1, a hard flame-retardant foam 11 is pasted under the box body hanging ear 7 to limit the battery cell module 9 laterally, and the front and rear inner walls of the battery lower barrel 1 limit the battery cell module 9 longitudinally. The module pressure beam 8 is bolted on the box body hanging ear 7 and presses the battery cell module 9 (upper and lower limit), and the battery management system BMS is fixed by the riveted studs on the module pressure beam 8, the 4G plastic cover 4, the 6+2 connector 5, and the Pin-shaped connector 6 are installed on the lower step of the box cover 2, and the battery handle 3 is installed on the upper step of the box cover 2.

[0018] The lower barrel 1 of the box body is preferably formed by an integral stretching process of low-carbon steel, which, on the one hand, increases the overall anti-collision performance of the battery, and also improves the restraint force of the box body on the module after the module expands during subsequent use of the battery.

[0019] The preferred solution of this embodiment is that the upper cover 2 is preferably die-cast aluminum, and a pouring column is reserved at the screw hole and then a blind hole is tapped to avoid riveting the screw holes on the box cover to increase the possibility of air leakage of the box cover.

[0020] The preferred solution of this embodiment is that the top of the box cover is in the shape of two steps, the upper step is equipped with a battery handle 3 for easy extraction, and the lower step is equipped with a 4G plastic cover 4 and a battery connector to prevent the plastic cover or connector from being higher than the top of the battery and being crushed.

[0021] The preferred solution of this embodiment is that a hard flame-retardant foam block is pasted on the inner wall side of the lower barrel 1 of the box body (the foam can be replaced with a metal clamping beam if the cost is controllable, and the foam block is preferably parallel to the large surface of the battery cell module) to fill the gap under the box body ear 7 and limit the battery cell module 9 at the same time.

[0022] The preferred solution of this embodiment is that the module pressure beam 8 not only limits the battery module 7 in the up and down directions, but also plays a role in fixing the battery management system BMS10.

[0023] The preferred solution of this embodiment is that the battery module 9 structural design is applicable to battery types including: square shell, soft pack and cylindrical battery, and the battery voltage platform can be 48V / 60V / 72V according to the number of single battery strings. This embodiment is square.

[0024] The preferred solution of this embodiment is that the double connector of the box cover 2 is redundantly designed, using two connectors with the same function but different models, thereby increasing the adaptability of the battery to different vehicles.

[0025] In order to more clearly understand the advantages of the shared bicycle battery structure design provided by the present invention, the internal structure and assembly process of the battery are described in detail below:

[0026] like Figure 1 As shown in the cross-sectional view, during assembly, first stick a hard flame-retardant foam sheet 11 on the side of the lower barrel of the box, put the assembled battery cell module 9 into the lower barrel 1 of the box, then use 4 bolts to install the module pressure beam 8 on the box ear 7 and press the battery cell module 9, then install the battery management system BMS10 on the riveted studs on the module pressure beam 8, then assemble the battery cover 2, connect the wires on the two connectors of the cover 2 to the battery management system BMS10 and the battery cell module 9 through the wiring harness plug, and finally assemble the cover 2 and the lower barrel 1 of the box together to complete the battery assembly of this structural design.

[0027] The above-mentioned detailed description of a lithium battery for a two-wheeled electric vehicle with reference to the embodiment is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the utility model should fall within the scope of protection of the utility model.

Claims

1. A lithium battery for a two-wheeled electric vehicle, characterized in that: It includes a lower barrel of a box body, a box cover, a battery handle, a 4G plastic cover, a 6+2 connector, an audio line connector, a module lifting ear, a module pressure beam, a battery cell module and a battery management system BMS. The battery cell module is placed in the lower barrel of the box body, and the module lifting ear is fixedly connected to the side of the inner wall of the lower barrel of the box body. The module lifting ear is installed with a module pressure beam through bolts. The module pressure beam presses the battery cell module. Studs are riveted on the module pressure beam and a battery management system BMS is installed. The lower barrel of the box body is connected to the box cover, and the box cover is sequentially fixed with a 6+2 connector, an audio line connector and a 4G plastic cover to form a single-vehicle battery system structure.

2. The lithium battery for two-wheeled electric vehicle according to claim 1, characterized in that: The lower barrel of the box body is formed by an integral stretching process of low-carbon steel Q235.

3. The lithium battery for two-wheeled electric vehicle according to claim 1 or 2, characterized in that: A hard flame-retardant foam for limiting the position of the battery core module is pasted on the inner wall side of the lower barrel of the box body.

4. The lithium battery for two-wheeled electric vehicle according to claim 3, characterized in that: A sealing gasket is provided between the lower barrel of the box body and the box cover to increase the air tightness of the battery.

5. The lithium battery for two-wheeled electric vehicle according to claim 1, characterized in that: The box cover is in the shape of two steps, the upper step is equipped with a battery handle, and the lower step is equipped with a 6+2 connector, an audio line connector and a 4G plastic cover in sequence. The box cover is formed in one piece by die-casting aluminum.

6. The lithium battery for two-wheeled electric vehicle according to claim 1, characterized in that: The battery cell module is formed by winding a plurality of single battery cells with glass fiber tape or fixing them with brackets.

7. The lithium battery for two-wheeled electric vehicle according to claim 1, characterized in that: The 6+2 connector and the audio line connector are connected in parallel inside the battery.

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