Battery pack for two-wheeled vehicle

Abstract

The invention relates to the technical field of power batteries, in particular to a battery pack for a two-wheeled vehicle, which comprises a lower shell, a battery module, a high-voltage plug-in and an upper cover, the battery module comprises a battery cell module and an electric appliance module, the battery cell module is laterally arranged in the lower shell, and the high-voltage plug-in is arranged in the lower shell. The upper end and the lower end of the battery cell module are respectively provided with an upper plate and a lower plate, the lower plate is fixed in the lower shell, the electric appliance module is arranged on the upper plate, the battery cell module is arranged on the lower plate, the upper cover is arranged above the lower shell, and the lower cover is arranged above the lower shell. And the high-voltage plug-in is mounted on the upper cover, so that the problems of thermal runaway risk, BMS (Battery Management System) short plate and structural design limitation at the present stage are solved.

Description

Technical Field

[0001] The present invention relates to the field of power battery control, and in particular to a battery pack for a two-wheeled vehicle. Background Art

[0002] Currently, two-wheeled vehicle battery packs primarily utilize lithium batteries, particularly lithium iron phosphate batteries. BYD's Blade Battery is a representative example, boasting an energy density of 180Wh / kg, three times that of lead-acid batteries, and a range of over 500 kilometers on a single charge. Furthermore, sodium batteries are also making inroads in the two-wheeled vehicle market, with Chuanyi Sodium Electric Technology Co., Ltd. already in mass production.

[0003] The safety of lithium batteries is a key area of ​​improvement in current technology. BYD's Blade Battery has passed rigorous tests such as needle penetration and 3-meter drop, with a surface temperature of only 30-60°C and no smoke, ensuring the safety of the battery under extreme conditions. In addition, the application of the Battery Management System (BMS) has also significantly improved the safety performance of the battery, monitoring the battery status in real time to prevent overcharging, short circuits and other problems.

[0004] At present, ternary lithium materials begin to decompose at 180°C, and lithium iron phosphate begins to decompose at 250°C. The ignition time in the needle penetration test is less than 3 seconds. The BMS has shortcomings, the SOC estimation error is ≥±5% and the balancing current is generally <100mA, which leads to the amplification of battery cell differences. The lead-acid battery that meets the 60km range weighs 35kg, which is far more than 63% of the new national standard limit of 55kg.

[0005] At present, a two-wheeled vehicle battery pack is proposed to solve the problems of thermal runaway risk, BMS shortcomings and structural design limitations raised in the above background technology. Summary of the Invention

[0006] The present invention aims to provide a battery pack for two-wheeled vehicles that utilizes a lateral arrangement of cells, allowing for more cells to be accommodated within a specific housing, thereby increasing the space-saving energy density. Furthermore, the placement of electrical components on the top layer of the cell module facilitates the overall assembly and manufacturing process. This rational arrangement of electrical components also meets high-rate electrical performance requirements, fulfilling the high-rate charge and discharge demands of two-wheeled vehicles.

[0007] A battery pack for a two-wheeled vehicle includes a lower shell, a battery module, a high-voltage plug-in and an upper cover. The battery module includes a cell module and an electrical module. The cell module is arranged laterally and placed in the lower shell. The upper and lower ends of the cell module are respectively provided with an upper plate and a lower plate. The lower plate is fixed in the lower shell. The electrical module is mounted on the upper plate, the cell module is mounted on the lower plate, the upper cover is arranged above the lower shell, and the high-voltage plug-in is mounted on the upper cover.

[0008] It is further defined that the battery cell module includes a front battery cell module and a rear battery cell module, the front battery cell module and the rear battery cell module are each composed of 20 battery cells connected in series and parallel through aluminum bars, the front battery cell module and the rear battery cell module are connected in series through a high-voltage wiring harness, the front battery cell module and the rear battery cell module are both wrapped on all sides with epoxy boards, and the front battery cell module and the rear battery cell module are both fixed by a module pressing plate.

[0009] It is further defined that the electrical module includes a fuse, a shunt and a relay, the positive pole of the battery cell is connected to the fuse through a copper busbar, the fuse is connected to the relay, the negative pole of the battery cell is connected to the shunt through a copper busbar, the shunt is connected to the relay, and the relay is connected to the high-voltage plug-in.

[0010] It is further defined that four waterproof connectors are provided around the high-voltage plug-in, and the four waterproof connectors are provided above the upper cover and located at the front and rear sides of the high-voltage plug-in.

[0011] It is further defined that a waterproof adhesive strip is provided at the connection between the upper cover and the lower shell.

[0012] It is further defined that foam with adhesive backing is arranged between the battery cells, the front battery cell module and the rear battery cell module are spaced by the epoxy plate, there are two lower plates, which are respectively arranged below the front battery cell module and the rear battery cell module, and the two lower plates are both arranged on the U-shaped guard plate, and the U-shaped guard plate is arranged on the inner bottom surface of the lower shell, and the left and right sides of the front battery cell module and the rear battery cell module are provided with module side panels, and the module side panels are also provided with reinforcing ribs.

[0013] It is further defined that the two sides of the battery module are provided with insulating cover plates, the lower shell is made of aluminum shell, and the upper cover is made of composite material. The beneficial effects of the present invention compared to the current stage are: 1. The battery cells are arranged laterally, so that the aluminum shell can accommodate more battery cells and improve the space energy density. Secondly, the structure of the components themselves is used to achieve lifting and limiting during the assembly process.

[0014] 2. The placement of electrical components on the upper part of the battery module facilitates the overall assembly and manufacturing process. The rational placement of electrical components also meets high-rate electrical performance requirements, thus satisfying the high-rate charge and discharge needs of two-wheeled vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 It is a schematic diagram of an exploded view of the present invention.

[0016] The markings in the figure correspond to: 1-lower shell, 2-high-voltage plug-in, 3-upper cover, 4-front battery module, 5-rear battery module, 6-epoxy board, 7-module pressure plate, 8-upper plate, 9-lower plate, 10-U-shaped guard plate, 11-module side plate, 12-reinforcement rib, 13-electrical module, 14-waterproof rubber strip, 15-waterproof connector, 16-insulating side plate. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments. Example

[0018] like Figure 1 and Figure 2 As shown, a battery pack for a two-wheeled vehicle includes a lower shell 1, a battery module, a high-voltage plug-in 2 and an upper cover 3. The lower shell 1 is a hollow cavity with an upper opening. The battery module includes a cell module and an electrical module. The cell module includes a front cell module 4 and a rear cell module 5. The front cell module 4 and the rear cell module 5 are each composed of 20 cells connected in series and in parallel through aluminum bars. The front cell module 4 and the rear cell module 5 are connected in parallel through a high-voltage wiring harness. Foam with adhesive backing is provided between each cell. The front cell module The epoxy plate 6 is used to separate the front battery module 4 and the rear battery module 5. The front battery module 4 and the rear battery module 5 are also covered with the epoxy plate 6 on all sides. The front battery module 4 and the rear battery module 5 are fixed by the module pressing plate 7. The front battery module 4 and the rear battery module 5 are both arranged laterally and placed in the lower shell 1. The upper end and the lower end of the battery module are respectively provided with an upper plate 8 and a lower plate 9. There are two lower plates 8, which are respectively provided below the front battery module 4 and the rear battery module 5. The two lower plates 8 are both provided with The U-shaped guard plate 10 is arranged on the inner bottom surface of the lower shell 1. The left and right sides of the front battery module 4 and the rear battery module 5 are provided with module side plates 11. The module side plates 11 are also provided with reinforcing ribs 12. The electrical module is arranged on the upper plate. The electrical module 13 includes a fuse, a shunt and a relay. The positive pole of the battery cell is connected to the fuse through a copper busbar, the fuse is connected to the relay, the negative pole of the battery cell is connected to the shunt through a copper busbar, the shunt is connected to the relay, and the electrical schematic diagram is used for connection. The high and low voltage wiring harnesses are arranged separately to meet the electrical clearance design and EMC requirements. The upper cover 3 is arranged above the lower shell 1. A waterproof rubber strip 14 is provided at the connection between the upper cover 3 and the lower shell 1. The high-voltage plug-in 2 is installed on the upper cover 3. Four waterproof connectors 15 are provided around the high-voltage plug-in 2. The four waterproof connectors 15 are arranged at the upper end of the upper cover 3 and are located on the front and rear sides of the high-voltage plug-in 2. The lower shell 1 is made of aluminum and the upper cover 3 is made of composite materials to meet the requirements of lightweight and waterproof heat dissipation.

[0019] During installation, the battery cells are stacked on the tooling in a grouping manner of 2P10S; the battery cells are pasted with adhesive-backed foam with a compression amount of 50%, and the front battery cell module 4 and the rear battery cell module 5 are separated by an epoxy plate 6. After stacking is completed, the four sides are wrapped with epoxy plates 6, and the module side panels 11 and U-shaped guard plates 10 are used for installation and fixation. The upper plate 8 is used to fix the module to ensure flatness, and then it is pushed onto the laser equipment, and the aluminum bars are arranged for laser welding. Due to the high magnification, a thicker aluminum bar design is adopted, and the aluminum bar welding area is thinned. After the two battery cell modules are assembled and welded, they are assembled and fixed before entering the lower shell 1, and are passed through a high The wire harness is pressed to achieve electrical connection between the two battery modules. Among them, the upper plate 8 is partially installed and arranged for electrical components in advance, including insulators of different types. In addition, the entire module needs to be protected and installed. Insulating sheaths are installed at the high-voltage lead-out terminals to provide insulation protection. Insulating side panels 16 are installed on both sides of the entire battery module and fixed with bolts. The whole is hoisted into the lower shell 1 by using lifting tools, hooks and lifting holes on the module pressing plate 7; the insulating side panels 16 are slightly smaller than the inner cavity size of the box as a whole. After entering the shell, they limit each other and finally fall to the bottom. Use an extended screw gun to fix the bolts to the bottom as a whole.

[0020] The above is a detailed introduction to a two-wheeled vehicle battery pack provided by the present invention. The description of the specific embodiments is only used to help understand the method and core concept of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the present invention. These improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A battery pack for a two-wheeled vehicle, characterized in that: The invention comprises a lower shell (1), a battery module, a high-voltage plug-in unit (2) and an upper cover (3), wherein the battery module comprises a cell module and an electrical module, wherein the cell module is arranged laterally and placed in the lower shell (1), wherein the upper end and the lower end of the cell module are respectively provided with an upper plate (8) and a lower plate (9), wherein the lower plate (9) is fixed in the lower shell (1), wherein the electrical module is mounted on the upper plate (8), wherein the cell module is mounted on the lower plate (9), wherein the upper cover (3) is arranged above the lower shell (1), and wherein the high-voltage plug-in unit (2) is mounted on the upper cover (3).

2. A two-wheeled vehicle battery pack according to claim 1, characterized in that: The battery cell module comprises a front battery cell module (4) and a rear battery cell module (5), each of the front battery cell module (4) and the rear battery cell module (5) being composed of 20 battery cells connected in series and in parallel via aluminum bars, the front battery cell module (4) and the rear battery cell module (5) being connected in series via a high-voltage wiring harness, the front battery cell module (4) and the rear battery cell module (5) being wrapped on all sides by an epoxy board (6), and the front battery cell module (4) and the rear battery cell module (5) being fixed by a module pressing plate (7).

3. A two-wheeled vehicle battery pack according to claim 2, characterized in that: The electrical module (13) includes a fuse, a shunt and a relay, the positive pole of the battery cell is connected to the fuse via a copper busbar, the fuse is connected to the relay, the negative pole of the battery cell is connected to the shunt via a copper busbar, the shunt is connected to the relay, and the relay is connected to the high-voltage plug-in.

4. The battery pack for a two-wheeled vehicle according to claim 1, characterized in that: Four waterproof connectors (15) are arranged around the high-voltage plug-in unit (2). The four waterproof connectors (15) are arranged at the upper end of the upper cover (3) and are located at the front and rear sides of the high-voltage plug-in unit (2).

5. The battery pack for a two-wheeled vehicle according to claim 1, characterized in that A waterproof adhesive strip (14) is provided at the connection between the upper cover (3) and the lower shell (1).

6. The battery pack for a two-wheeled vehicle according to claim 2, characterized in that: Foam with adhesive backing is provided between the battery cells. The front battery cell module (4) and the rear battery cell module (5) are spaced by the epoxy plate (6). There are two lower plates (9), which are respectively provided below the front battery cell module (4) and the rear battery cell module (5). The two lower plates (9) are both provided on a U-shaped guard plate (10). The U-shaped guard plate (10) is provided on the inner bottom surface of the lower shell (1). The left and right sides of the front battery cell module (4) and the rear battery cell module (5) are both provided with module side plates (11), and the module side plates (11) are also provided with reinforcing ribs (12).

7. The battery pack for a two-wheeled vehicle according to claim 2, characterized in that: Insulating side plates (16) are provided on both sides of the battery module, the lower shell (1) is made of aluminum, and the upper cover (3) is made of composite material.

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