A battery pack and an electric two-wheeler

Abstract

This utility model discloses a battery pack and an electric two-wheeler. The battery pack includes an electrical unit, a cover, and a battery module housed within the cover. The electrical unit is mounted on the cover and includes a protection board, a fuse, a charging socket, and a discharging socket. The protection board integrates a charging MOSFET and a discharging MOSFET, and has output terminals B- and P-. The negative terminal of the battery module is electrically connected to the output terminal B- of the protection board. One end of the fuse is connected to the positive terminal of the battery module, and the other end is connected to the positive terminal of the charging socket and the discharging socket. The negative terminals of the charging socket and the discharging socket are both connected to the output terminal P- of the protection board. This utility model uses a protection board that integrates charging and discharging MOSFETs to control the on / off of the high-voltage circuit, saving structural space and reducing costs. All high-voltage electrical components of the electrical unit are mounted on the cover, making full use of the battery pack's structural space and allowing for a more compact battery pack size.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack and an electric two-wheeler. Background Technology

[0002] Currently, most electric two-wheelers still use a copper busbar connection + BMS (battery management system) design for their electrical systems. The copper busbars require custom processing, are not easily bent, and the wiring takes up space and increases the overall vehicle weight. Using a BMS to collect individual battery pack voltage and temperature data requires additional high-voltage control circuits (such as fuses, high-voltage DC relays, shunts, etc.) to protect the battery pack from short circuits, overcurrent, overcharge, and undervoltage. These additional high-voltage control circuits not only occupy battery pack space but also significantly increase battery pack costs. As people's living spaces expand, the range of electric two-wheelers is constantly increasing. Correspondingly, the battery pack capacity is also increasing, but battery capacity is limited by the size of the battery pack, and the size and weight of the battery pack, in turn, limit the weight and space of the two-wheeler. Utility Model Content

[0003] Based on this, in response to the technical problems of the current electric two-wheeler electrical system adopting copper busbar connection + BMS design scheme, which occupies space, increases the weight of the whole vehicle, and greatly increases the cost of battery pack, this utility model provides a battery pack and an electric two-wheeler.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: This utility model first provides a battery pack, which includes an electrical unit, a cover, and a battery module disposed inside the cover. The electrical unit is mounted on the cover and includes a protection board, a fuse, a charging socket, and a discharging socket. The protection board integrates a charging MOSFET and a discharging MOSFET and has output terminals B- (short for battery-) and P- (short for power-). The total negative terminal of the battery module is electrically connected to the output terminal B- of the protection board. One end of the fuse is connected to the total positive terminal of the battery module, and the other end is connected to the positive terminal of the charging socket and the discharging socket. The negative terminals of the charging socket and the discharging socket are both connected to the output terminal P- of the protection board.

[0005] As a further improvement of the above-mentioned solution of this utility model, the output terminal B- of the protection board is provided with a high-voltage terminal 1, which is electrically connected to the negative high-voltage line of the module. The other end of the negative high-voltage line of the module is electrically connected to the total negative terminal of the battery module through a high-voltage terminal.

[0006] As a further improvement to the above-mentioned solution of this utility model, the total positive terminal of the battery module is connected to one end of the fuse through the module's positive high voltage line, and the other end of the fuse is electrically connected to the positive terminals of the discharge socket and the charging socket through the discharge positive terminal line and the charging positive terminal line, respectively.

[0007] As a further improvement to the above-mentioned solution of this utility model, the output terminal P- of the protection board is provided with a high-voltage terminal two. The negative terminal of the discharge socket is electrically connected to the high-voltage terminal two through the discharge negative terminal line, and the negative terminal of the charging socket is electrically connected to the high-voltage terminal two through the charging negative terminal line.

[0008] As a further improvement to the above-mentioned solution of this utility model, an interface plug-in is provided on the protection board; the electrical unit also includes an IOT module with positioning and communication functions, the IOT module is fixed to the cover by bolts, and the IOT module is electrically connected to the interface plug-in through a low-voltage wiring harness.

[0009] As a further improvement of the above-mentioned solution of this utility model, the protection board is provided with interface plug-in two; the electrical unit also includes an LED light board with the function of displaying power and battery pack fault codes, the LED light board is fixed to the cover by bolts, and the LED light board is connected to the interface plug-in two through low voltage wiring harness two; a switch button for controlling the LED light board is provided on the outside of the cover, and a window is opened on the cover at the position corresponding to the LED light board.

[0010] As a further improvement of the above-mentioned solution of this utility model, the cover is provided with an installation port one for installing a charging socket, and the charging socket is provided with a dust cover located outside the cover for dust protection; the cover is provided with an installation port two for installing a discharge socket, and the installation port two is provided with a positioning protrusion, and the discharge socket is provided with a positioning groove that engages with the positioning protrusion.

[0011] As a further improvement to the above-mentioned solution of this utility model, the protection board is provided with interface plug-in three, which is connected to the individual battery cells of the battery module through the individual cell voltage and temperature acquisition harness.

[0012] As a further improvement to the above-mentioned solution of this utility model, a wire harness fixing bracket is provided on the inner side of the box cover.

[0013] This utility model also provides an electric two-wheeled vehicle, which includes the battery pack as described above.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The battery pack provided by this utility model has all high-voltage electrical components of the electrical unit mounted on the cover, making full use of the battery pack's structural space without occupying space inside the casing. The inside of the casing is used for cell placement, which can increase the battery pack's capacity. Simultaneously, since the electrical units are mounted on the cover, the operation is not energized before the cover is assembled with the battery modules, eliminating the risk of electric shock. This utility model uses a protection board to integrate charging and discharging MOSFETs to control the high-voltage circuit's on / off state. Compared to using a BMS to control the on / off state of a high-voltage DC relay, this saves structural space and reduces costs.

[0015] This invention features an IoT module that can locate the battery pack, providing anti-theft protection and facilitating the retrieval of stolen vehicles. Furthermore, it utilizes high-voltage wiring harnesses instead of copper busbars, allowing for flexible wiring in compact spaces, reducing battery pack costs and weight, and better adapting to complex internal structures and confined spaces within the battery pack. Attached Figure Description

[0016] Figure 1 This is a partial structural diagram of a battery pack provided in an embodiment of the present utility model; Figure 2 An electrical connection diagram of a battery pack provided for an embodiment of this utility model; Figure 3 for Figure 1 Exploded view; Figure 4 for Figure 1 The main view.

[0017] Attached reference numerals: 1. Box cover; 2. IOT module; 3. Protection board; 3-1. High-voltage terminal one; 3-2. High-voltage terminal two; 3-3. Bolt hole; 3-4. Interface plug one; 3-5. Interface plug two; 3-6. Interface plug three; 4. Charging socket; 4-1. Charging negative wire; 4-2. Charging positive wire; 4-3. Dust cover; 5. LED light board; 6. Discharge socket; 6-1. Discharge negative wire; 6-2. Discharge positive wire; 7. Module positive high-voltage wire; 8. Fuse; 9. Module negative high-voltage wire; 9-1. High-voltage terminal; 10. Switch button; 11. Wiring harness fixing bracket; 12. Positioning protrusion; 13. Battery module; 14. Individual cell voltage and temperature acquisition wiring harness; 15. Low-voltage wiring harness one; 16. Low-voltage wiring harness two. Detailed Implementation

[0018] To facilitate understanding of this invention, a more comprehensive description of the invention will be provided below with reference to specific embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] Reference Figure 1-3 This embodiment proposes a battery pack for an electric two-wheeled vehicle, which includes a housing (not shown), a battery module 13 disposed within the housing, a housing cover 1 that seals the housing, and an electrical unit. The electrical unit is mounted on the housing cover 1.

[0021] The electrical unit includes a protection board 3, a fuse 8, a charging socket 4, and a discharging socket 6, as well as an IoT module 2 and an LED light board 5. The cover 1 is made of plastic and has a wiring harness fixing bracket 11 for fixing the wiring harness. The high and low voltage wiring harnesses are fixed to the nearest wiring harness fixing bracket 11 with cable ties. On the one hand, the high and low voltage are fixed separately, so there is no interference between the high and low voltage. On the other hand, during vehicle operation, it can avoid mechanical stress caused by the movement of the wiring harness, thus extending the service life of the wiring harness. Before the cover 1 is assembled with the battery module 13, the electrical unit is installed on the cover 1 and is operated without power, so there is no risk of electric shock.

[0022] The protection board 3 has four bolt holes 3-3 around its circumferential edge, and is fixed to the inside of the cover 1 by four bolts. The protection board 3 integrates a charging MOSFET and a discharging MOSFET, and has output terminals B- and P-. The output terminal B- of the protection board 3 is provided with a high-voltage terminal 3-1, and the output terminal P- of the protection board 3 is provided with a high-voltage terminal 3-2. The high-voltage terminal 3-1 is electrically connected to the module's negative high-voltage line 9, and the other end of the module's negative high-voltage line 9 is electrically connected to the total negative terminal of the battery module 13 through a high-voltage terminal 9-1. In this embodiment, the high-voltage terminal 9-1 is a 90-degree anti-rotation terminal, so that the high-voltage terminal 9-1 will not be rotated under force when fixed, facilitating quick and easy installation. The protection board 3 is equipped with interface plug-in 1 3-4, interface plug-in 2 3-5, and interface plug-in 3-6. All three interfaces (3-4, 3-5, and 3-6) are designed to prevent incorrect insertion by workshop personnel during low-voltage wiring harness assembly. Interface plug-in 3-6 of the protection board 3 connects to the individual cells of the battery module 13 via the individual cell voltage and temperature acquisition harness 14 to collect the individual cell voltage and temperature.

[0023] The positive terminal of battery module 13 is connected to one end of fuse 8 via module positive high-voltage line 7. The other end of fuse 8 is electrically connected to the positive terminals of discharge socket 6 and charging socket 4 via discharge positive line 6-2 and charging positive line 4-2, respectively. The negative terminal of discharge socket 6 is electrically connected to high-voltage terminal 3-2 via discharge negative line 6-1, and the negative terminal of charging socket 4 is electrically connected to negative high-voltage terminal via charging negative line 4-1.

[0024] By disconnecting the negative terminal of the high-voltage circuit through the charging MOSFET and discharging MOSFET inside the protection board 3, the battery pack is protected against overcurrent, overvoltage, and undervoltage.

[0025] The IOT module 2, which has positioning and communication functions, is fixed to the inside of the cover 1 by two bolts and connected to the interface plug-3-4 of the protection board 3 through a low-voltage wiring harness-15, so as to realize communication and data transmission with the protection board 3, such as the transmission of data such as battery cell voltage and temperature, and the current position of the battery pack.

[0026] An LED light board 5, which displays battery level and battery pack fault codes, is bolted to the cover 1 and connected to the interface plug 3-5 of the protection board 3 via a low-voltage wiring harness 16. This enables communication and data transmission with the protection board 3. For example, the current SOC of the battery pack and any fault alarms can be clearly seen on the LED light board 5. Figure 4 A window for staff to view is provided on the cover 1 at a position corresponding to the LED light panel 5, and a switch button 10 for controlling the LED light panel 5 is provided on the outside of the cover 1.

[0027] In this embodiment, the cover 1 has an installation port for installing the charging socket 4, and the charging socket 4 has a dust cover 4-3 located outside the cover 1 to prevent dust. The orientation of the dust cover 4-3 prevents incorrect installation.

[0028] In this embodiment, the cover 1 has a second mounting opening for installing the discharge socket 6, and a positioning protrusion 12 is provided at the second mounting opening. The discharge socket 6 has a positioning groove that engages with the positioning protrusion 12. The discharge socket 6 can only be installed when the groove of the discharge socket 6 is engaged with the positioning protrusion 12. During the installation of the discharge socket 6, the positioning protrusion 12 serves to prevent incorrect installation.

[0029] Both the charging socket 4 and the discharging socket 6 are integrated plug-ins that combine the high-voltage positive terminal, the negative terminal, and the low-voltage terminal into one unit, which reduces the opening size of the cover 1, improves installation efficiency, and saves costs.

[0030] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A battery pack comprising an electrical unit and a cover (1) and a battery module (13) disposed within the cover, characterized in that, The electrical unit is installed on the cover (1). The electrical unit includes a protection board (3), a fuse (8), a charging socket (4), and a discharging socket (6). The protection board (3) integrates a charging MOSFET and a discharging MOSFET and has output terminals B- and P-. The total negative terminal of the battery module (13) is electrically connected to the output terminal B- of the protection board (3); one end of the fuse (8) is connected to the total positive terminal of the battery module (13) and the other end is connected to the positive terminal of the charging socket (4) and the discharging socket (6); the negative terminals of the charging socket (4) and the discharging socket (6) are both connected to the output terminal P- of the protection board (3).

2. The battery pack according to claim 1, characterized in that, The output terminal B of the protection board (3) is provided with a high voltage terminal (3-1), which is electrically connected to the module negative high voltage line (9). The other end of the module negative high voltage line (9) is electrically connected to the total negative terminal of the battery module (13) through the high voltage terminal (9-1).

3. The battery pack according to claim 1, characterized in that, The positive terminal of the battery module (13) is connected to one end of the fuse (8) through the module positive high voltage line (7), and the other end of the fuse (8) is electrically connected to the positive terminals of the discharge socket (6) and the charging socket (4) through the discharge positive line (6-2) and the charging positive line (4-2), respectively.

4. The battery pack according to claim 1, characterized in that, The output terminal P- of the protection board (3) is provided with a high voltage terminal (3-2). The negative terminal of the discharge socket (6) is electrically connected to the high voltage terminal (3-2) through the discharge negative terminal line (6-1). The negative terminal of the charging socket (4) is electrically connected to the high voltage terminal (3-2) through the charging negative terminal line (4-1).

5. The battery pack according to claim 1, characterized in that, The protection board (3) is provided with an interface plug-in (3-4); the electrical unit also includes an IOT module (2) with positioning and communication functions. The IOT module (2) is fixed to the box cover (1) by bolts. The IOT module (2) is electrically connected to the interface plug-in (3-4) through a low-voltage wire harness (15).

6. The battery pack according to claim 1, characterized in that, The protection board (3) is provided with interface plug-in two (3-5); the electrical unit also includes an LED light board (5) with the function of displaying power and battery pack fault codes. The LED light board (5) is fixed to the cover (1) by bolts. The LED light board (5) is connected to the interface plug-in two (3-5) through low voltage wiring harness two (16). A switch button (10) for controlling the LED light board (5) is provided on the outside of the cover (1). A window is opened on the cover (1) at the position corresponding to the LED light board (5).

7. The battery pack according to claim 1, characterized in that, The cover (1) has an installation port for installing the charging socket (4), and the charging socket (4) has a dust cover (4-3) located outside the cover (1) for dust protection; the cover (1) has an installation port for installing the discharge socket (6), and the installation port has a positioning protrusion (12), and the discharge socket (6) has a positioning groove that engages with the positioning protrusion (12).

8. The battery pack according to claim 1, characterized in that, The protection board (3) is equipped with interface plug-in three (3-6), which is connected to the individual battery of the battery module (13) through the individual voltage and temperature acquisition harness (14).

9. The battery pack according to claim 1, characterized in that, A wire harness fixing bracket (11) is provided on the inside of the box cover (1).

10. An electric two-wheeled vehicle, characterized in that, It includes the battery pack as described in any one of claims 1-9.

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