21700 cell-based 20S4P electric motorcycle power battery pack

Abstract

The utility model discloses a 21700 battery cell-based 20S4P electric motorcycle power battery pack, which comprises a lower shell, an upper shell, a connector, a battery module and an insulating sheet, and the connector is arranged on the upper shell; the lower shell and the upper shell are detachably connected; the battery module comprises at least two battery modules and a BMS (Battery Management System) module; each battery module comprises a plurality of 21700 battery cells; an insulating sheet is arranged between every two adjacent battery modules, and the battery modules are connected in series and then connected with the BMS module; the battery module is wrapped with an insulating sheet and then placed in the lower shell, a receding hole is formed in the end, facing the connector, of the battery module, and the BMS module is connected with the connector through the receding hole. The 21700 battery cells are used for building the battery modules, the battery modules are isolated by the insulating sheets and then connected in series to form the battery module, the battery module is connected with the BMS module, and the connector is connected with the BMS module and used for charging and discharging the battery module according to the BMS module. The battery module has higher energy density, the grouping efficiency is high, and the endurance mileage is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of power batteries, specifically relating to a 20S4P electric motorcycle power battery pack based on 21700 cells. Background Technology

[0002] The driving range of electric motorcycles is mainly limited by the capacity of the on-board battery. Currently, electric motorcycles typically use lithium iron phosphate batteries, which have low energy density, resulting in short driving range. This has a certain impact on the promotion and application of electric motorcycles, since the main users of electric motorcycles are delivery drivers, chauffeurs, or delivery personnel who need to travel for long periods of time. In order to meet the end customers' requirements for improved driving range, there is an urgent need to develop a battery for electric motorcycles with a longer driving range. Utility Model Content

[0003] This invention provides a 20S4P electric motorcycle power battery pack based on 21700 cells. The power battery pack is composed of 21700 ternary lithium batteries, which has a higher energy density.

[0004] The technical solution adopted in this utility model is as follows: a 20S4P electric motorcycle power battery pack based on 21700 cells, including a lower shell, an upper shell, a connector, battery modules, and insulating sheets. The connector is mounted on the upper shell; the lower shell and the upper shell are detachably connected; the battery module includes at least two battery modules and a BMS module; each battery module includes several 21700 cells; insulating sheets are provided between adjacent battery modules, and each battery module is connected in series and then connected to the BMS module; the battery module is placed inside the lower shell after being wrapped with insulating sheets, and a clearance hole is provided at the end of the battery module facing the connector, through which the BMS module is connected to the connector. Using 21700 cells to assemble battery modules, the battery modules are connected in series after being isolated by insulating sheets to form battery modules, which are then connected to the BMS module. The connector is connected to the BMS module to allow the battery modules to charge and discharge according to the BMS module. The battery modules have higher energy density, higher assembly efficiency, and extended driving range.

[0005] As a preferred embodiment of this utility model, a handle is detachably installed on the upper housing. The handle facilitates the overall movement of the power battery.

[0006] In a preferred embodiment of this invention, the battery module is wrapped with an insulating sheet and then covered with fiber tape. The insulating sheet is a single piece that wraps around the battery module and is then secured with fiber tape to prevent it from detaching from the battery module. Alternatively, a one-piece molded insulating sheet can be used to cover the battery module, but using fiber tape provides a better securing effect.

[0007] In a preferred embodiment of this utility model, adjacent battery modules are connected in series via module series wires. Each battery module includes a left insulating bracket, a right insulating bracket, a 21700 battery cell, and current-carrying plates. The left and right insulating brackets are arranged opposite to each other. The left insulating bracket has several left battery cell mounting holes, and the right insulating bracket has several right battery cell mounting holes. The left and right battery cell mounting holes correspond one-to-one to form a battery cell mounting area. Each battery cell mounting area has one 21700 battery cell installed horizontally. Several current-carrying plates are provided on both the left and right insulating brackets, and each current-carrying plate connects all the 21700 battery cells in the battery cell mounting area in series and parallel. The left and right insulating brackets have the same structure, so that the positive and negative terminals of the 21700 battery cells are respectively mounted on one insulating bracket. The current-carrying plates connect the 21700 battery cells in series and parallel, and the series and parallel connection method is designed according to the required capacity.

[0008] As a preferred embodiment of this utility model, a module series extension portion is provided on a current-carrying plate facing the BMS module on the right insulating bracket, and the module series wire is connected to the two adjacent module series extension portions; an extension connection portion is provided on a current-carrying plate facing the connector on the right insulating bracket, and the two adjacent extension connection portions are respectively connected to the BMS module via a connecting wire.

[0009] In a preferred embodiment of this invention, the lower and upper housings are metal housings with insulating layers. Metal housings offer better protection, and the entire metal housing is coated with an insulating layer to prevent electrical leakage.

[0010] This invention uses 21700 battery cells to assemble battery modules. The battery modules are then connected in series via module series wires to increase the overall capacity, providing electric motorcycles with a longer driving range. The manufacturing process is simple, low-risk, and has lower upgrade costs compared to existing batteries. It is also easy to maintain because the upper and lower shells can be opened, and the battery modules can be removed for replacement and repair. The handle also facilitates the movement of the power battery. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the present invention with the upper and lower shells omitted.

[0014] Figure 3 This is a schematic diagram of the battery module structure of this utility model. Figure 1 .

[0015] Figure 4 This is a schematic diagram of the battery module structure of this utility model. Figure 2 .

[0016] Figure 5 This is a top view of the battery module of this utility model.

[0017] Figure 6 This is an isometric view of the battery module of this utility model.

[0018] Figure 7 Side view of the battery module of this utility model Figure 1 .

[0019] Figure 8 Side view of the battery module of this utility model Figure 2 .

[0020] Figure 9 This is a schematic diagram of the structure of the right insulating bracket of this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] A 20S4P electric motorcycle power battery pack based on 21700 cells, such as Figure 1 and 2 As shown, the device includes a lower housing 1, an upper housing 2, a connector 3, a battery module 4, and an insulating sheet 5. The lower housing 1 and upper housing 2 are metal housings with insulating layers. Metal housings offer better protection, and the entire metal housing is coated with an insulating layer to prevent leakage. Furthermore, both the lower housing 1 and upper housing 2 have outer edges at their connection points. The lower housing 1 and upper housing 2 are fixed together by screws via these outer edges, thus achieving a detachable connection between the lower housing 1 and upper housing 2. Alternatively, adhesive sealing or snap-fit ​​connections can also be used; this embodiment only demonstrates screw fixing as an example. Figure 1 As shown. The connector is the interface for connecting the battery module to an external power source or device, mainly used for discharging or charging the battery module. Connector 3 is mounted on the upper housing 2.

[0023] Furthermore, a handle 8 is detachably installed on the upper housing 2. The handle is made of leather, and mounting holes are pre-drilled in the upper housing. The end of the handle is fixed to the upper housing with screws and nuts, and a washer is placed between the end of the handle and the upper housing. Of course, the handle can be installed not only with screws but also with adhesive, as long as the handle can be fixed to the upper housing. This facilitates the overall movement of the power battery, allowing it to be used independently without environmental restrictions.

[0024] like Figure 2-5 As shown, the battery module 4 includes at least two battery modules 41 and a BMS module 42. This embodiment uses two battery modules as an example for demonstration.

[0025] An insulating sheet 5 is provided between adjacent battery modules 41, such as Figure 6 As shown, the insulating sheet in this embodiment is made of epoxy resin.

[0026] Each of the battery modules 41 includes a left insulating bracket 411, a right insulating bracket 412, a 21700 cell 413, and a current-carrying plate 414.

[0027] The left insulating bracket 411 and the right insulating bracket 412 are arranged opposite to each other, as shown in the example. Figure 7 and 8 As shown, the left insulating bracket 411 is provided with a plurality of left cell mounting holes 4111, and the right insulating bracket 412 is provided with a plurality of right cell mounting holes 4112, such as... Figure 9 As shown, the left cell mounting hole 4111 and the right cell mounting hole 4112 correspond one-to-one to form a cell mounting area. Each cell mounting area is equipped with a 21700 cell 413, which is arranged horizontally.

[0028] Both the left insulating bracket 411 and the right insulating bracket 412 are equipped with several current-carrying plates 414, and each current-carrying plate 414 connects all the 21700 cells 413 in the cell mounting area in series and parallel. The left and right insulating brackets have the same structure, so that the positive and negative terminals of the 21700 cells are respectively mounted on one insulating bracket, and the current-carrying plates connect the 21700 cells in series and parallel. The series and parallel connection method is designed according to the required capacity.

[0029] like Figure 2-6 As shown, a module series extension portion 4141 is provided on a current-carrying plate 414 facing the BMS module 42 on each right insulating bracket 412, and the module series wire 6 is connected to the two adjacent module series extension portions 4141 to connect the two battery modules together in series.

[0030] An extended connection portion 4142 is provided on a current-carrying plate 414 facing the connector 3 on each right insulating bracket 412, and two adjacent extended connection portions 4142 are respectively connected to the BMS module 42 via a connecting wire 9.

[0031] After the battery module is assembled, it is surrounded by insulating sheets 5. In order to connect with connector 3, the end of the battery module 4 facing connector 3 has a clearance hole. The BMS module 42 connects to connector 3 through the clearance hole, such as... Figure 2 As shown, to save costs, the end of the battery module 4 facing the connector 3 can be without an insulating sheet. Instead, a layer of fiber tape 7 is wrapped around the insulating sheet to secure it. The insulating sheet is a single piece that wraps around the battery module, and then secured with fiber tape to prevent it from detaching. Alternatively, a one-piece insulating sheet could be used, but fiber tape provides better fixation. After the fiber tape is wrapped around the battery module, the entire battery module is placed inside the lower housing 1, with the 21700 cells arranged horizontally.

[0032] The assembly process is as follows: 21700 cells are installed into the left and right insulating brackets, and the entire installation process is completely insulated. After the cells of the two battery modules are installed, the current-carrying plates of each battery module are spot-welded. The current-carrying plates are made of pure nickel. After the current-carrying plates are welded, an insulating sheet is placed between the two battery modules. Then, the module series wire 6 is welded to the two module series extension parts 4141 to realize the series connection of the two battery modules. Then, the connecting wire 9 is welded to the two extension connection parts 4142 to realize the connection between the battery module and the BMS module. Next, the battery is wrapped with an insulating sheet and fixed with fiber tape. Then, it is installed into the lower housing and the connector is installed into the upper housing. After the handle is installed, the upper and lower housings are fixed together with screws. The whole process is simple to operate, and the use of 21700 cells can provide a larger capacity and a longer range.

[0033] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A 20S4P electric motorcycle power battery pack based on 21700 battery cells, characterized by: The device includes a lower housing (1), an upper housing (2), a connector (3), a battery module (4), and an insulating sheet (5). The connector (3) is mounted on the upper housing (2). The lower housing (1) and the upper housing (2) are detachably connected. The battery module (4) includes at least two battery modules (41) and a BMS module (42). Each battery module includes several 21700 cells. An insulating sheet (5) is provided between adjacent battery modules (41), and each battery module (41) is connected in series and then connected to the BMS module (42). The battery module (4) is wrapped with an insulating sheet (5) and placed inside the lower housing (1). The end of the battery module (4) facing the connector (3) is provided with a clearance hole, and the BMS module (42) is connected to the connector (3) through the clearance hole.

2. The 20S4P electric motorcycle power battery pack based on 21700 battery cells according to claim 1, characterized in that: A handle (8) is detachably installed on the upper housing (2).

3. The 20S4P electric motorcycle power battery pack based on 21700 battery cells according to claim 1 or 2, characterized in that: The battery module (4) is wrapped with an insulating sheet (5) and then wrapped with fiber tape (7).

4. The 20S4P electric motorcycle power battery pack based on 21700 cells according to claim 3, characterized in that: Adjacent battery modules (41) are connected in series via module series wires (6); each battery module (41) includes a left insulating bracket (411), a right insulating bracket (412), a 21700 cell (413), and a current-carrying plate (414); the left insulating bracket (411) and the right insulating bracket (412) are arranged opposite to each other, the left insulating bracket (411) is provided with a plurality of left cell mounting holes (4111), and the right insulating bracket (412) is provided with a plurality of right cell mounting holes (4111). 4112), the left cell mounting hole (4111) and the right cell mounting hole (4112) correspond one to one to form a cell mounting area. Each cell mounting area is equipped with a 21700 cell (413). The 21700 cell (413) is arranged horizontally. Several current-carrying plates (414) are provided on the left insulating bracket (411) and the right insulating bracket (412). Each current-carrying plate (414) connects the 21700 cells (413) in all cell mounting areas in series and parallel.

5. The 20S4P electric motorcycle power battery pack based on 21700 battery cells according to claim 4, characterized in that: A module series extension portion (4141) is provided on a current-carrying plate (414) facing the BMS module (42) on the right insulating bracket (412), and a module series wire (6) is connected to two adjacent module series extension portions (4141); an extension connection portion (4142) is provided on a current-carrying plate (414) facing the connector (3) on the right insulating bracket (412), and two adjacent extension connection portions (4142) are connected to the BMS module (42) via a connecting wire (9).

6. The 20S4P electric motorcycle power battery pack based on 21700 battery cells according to claim 4, characterized in that: The lower housing (1) and the upper housing (2) are metal housings with insulating layers.

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