Novel high-capacity lithium battery pack for electric bicycle

Abstract

The utility model relates to the technical field of battery modules, in particular to a novel high-capacity lithium battery pack for an electric bicycle. The battery comprises a battery shell and a battery cell assembly arranged in the battery shell, wherein the battery cell assembly comprises a battery cell bracket, a plurality of cylindrical battery cells arranged in the battery cell bracket, and a copper bar which is arranged on the battery cell bracket and is used for connecting the cylindrical battery cells; the battery cell bracket comprises an upper bracket and a lower bracket which are correspondingly arranged up and down, and battery cell fixing holes formed in the upper bracket and the lower bracket, the battery cell fixing holes in the upper bracket and the lower bracket are arranged in a one-to-one correspondence manner, and each group of battery cell fixing holes are distributed by adopting a staggered arrangement structure. Compared with the prior art, the utility model has the beneficial effects that according to the technical scheme, the upper bracket and the battery cell fixing holes are formed in the upper bracket, and each group of battery cell fixing holes are distributed in a staggered arrangement structure, so that the gaps among the battery cells are reduced, and the space utilization rate is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, in particular to a novel high-capacity lithium battery pack for electric bicycles. Background Art

[0002] Compared with traditional lead-acid batteries, lithium-ion batteries have the characteristics of long cycle life, high energy density, and high reliability. With the rise of the sharing economy, electric bicycles have also ushered in opportunities for the "sharing economy". In addition, the competition for shared electric vehicles has also entered a white-hot stage. Only lithium battery packs with lower costs, better performance, and longer battery life can stand out in the competition.

[0003] With existing technology, the mainstream size of shared battery packs is 183*156*265mm, with a rated voltage of 48V. For this specification, the maximum capacity of lithium iron phosphate cells can only reach 24Ah. In order to increase the endurance, it is necessary to increase the capacity, reduce the number of charging times, and reduce operating costs.

[0004] Therefore, it is necessary to design a new type of high-capacity lithium battery pack for electric bicycles to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a novel high-capacity lithium battery pack for electric bicycles to overcome the above-mentioned shortcomings of the current prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A novel high-capacity lithium battery pack for electric bicycles, comprising a battery shell and a battery cell assembly placed in the battery shell, characterized in that: the battery cell assembly comprises a battery cell holder, a plurality of cylindrical battery cells installed in the battery cell holder, and a copper bus placed on the battery cell holder and connecting the cylindrical battery cells; the battery cell holder comprises an upper holder and a lower holder correspondingly arranged up and down, and battery cell fixing holes arranged on the upper holder and the upper holder, the battery cell fixing holes on the upper holder and the lower holder are arranged one by one, and each group of battery cell fixing holes are distributed in a staggered structure.

[0008] Preferably, protruding triangular blocks are provided on the sides of the upper bracket and the lower bracket, and holes are provided on the triangular blocks, and the triangular blocks of the upper bracket and the lower bracket are provided in a one-to-one correspondence.

[0009] Preferably, a DC module is also connected outside the battery core assembly.

[0010] Preferably, a protection plate bracket is installed at one end of the battery cell assembly, and a protection plate is installed on the protection plate bracket.

[0011] Preferably, the battery housing comprises an upper housing and a lower housing, and the upper housing and the lower housing are fixed together by fastening screws, a charging connector is provided on the upper housing, screw mounting holes are provided on the upper housing, and a discharge connector is provided at the side end.

[0012] Preferably, a handle is mounted on the battery housing via a mounting plate.

[0013] The beneficial effect of the utility model is that the technical solution reduces the gaps between the battery cells by providing the battery cell fixing holes on the upper bracket and the lower bracket, and adopts a staggered structure distribution between each group of battery cell fixing holes, thereby greatly improving the space utilization rate. At the same time, protruding triangular blocks are provided on the sides of the upper bracket and the lower bracket, and holes and grooves are opened on the triangular blocks, which are convenient for fixing by fixing parts. The structure is simple and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a new type of high-capacity lithium battery pack for electric bicycles in the utility model;

[0015] Figure 2 This is an exploded view of a new type of high-capacity lithium battery pack for electric bicycles of the utility model;

[0016] Figure 3 This is an exploded diagram of a battery cell assembly of a new type of high-capacity lithium battery pack for electric bicycles of the utility model;

[0017] Figure 4 This is a schematic diagram of the installation of a protective plate bracket for a new type of high-capacity lithium battery pack for electric bicycles in the utility model;

[0018] Figure 5 This is a top view of a battery cell assembly of a new type of high-capacity lithium battery pack for electric bicycles of the utility model;

[0019] In the figure: 1. battery case; 2. battery cell assembly; 21. battery cell bracket; 22. cylindrical battery cell; 23. copper busbar; 211. upper bracket; 212. lower bracket; 213. battery cell fixing hole; 214 triangular block; 3. DC module; 4. protection board bracket; 5. protection board; 11. upper case; 12. lower case; 111. charging connector; 121. discharge connector; 6. handle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0022] Reference Figures 1 to 5 , a new type of high-capacity lithium battery pack for electric bicycles, comprising a battery housing 1, and a battery cell assembly 2 placed in the battery housing;

[0023] The battery cell assembly 2 includes a battery cell bracket 21, a plurality of cylindrical battery cells 22 installed in the battery cell bracket, and a copper busbar 23 placed on the battery cell bracket and connecting the cylindrical battery cells; the battery cell bracket 21 includes an upper bracket 211 and a lower bracket 212 correspondingly arranged up and down, and battery cell fixing holes 213 arranged on the upper bracket and the upper bracket, the battery cell fixing holes on the upper bracket and the lower bracket are arranged one by one, and each group of battery cell fixing holes are distributed in a staggered structure, thereby reducing the gap between the battery cells and greatly improving the space utilization rate;

[0024] Protruding triangular blocks are provided on the sides of the upper bracket 211 and the lower bracket 212, and holes and slots are opened on the triangular blocks. The triangular blocks 214 of the upper bracket 211 and the lower bracket 212 are arranged one by one, which is convenient for fixing by fixing parts, has a simple structure, and is easy to install.

[0025] Specifically, 30 15Ah cylinders are fixed together through the upper bracket of the battery cell bracket and the lower bracket of the module. The 15 battery cells are connected in parallel and then in series through the series copper busbars to form a 2-in-15 series 48V30Ah module. Laser welding is used to transfer current between the series copper busbars and the positive and negative poles of the battery cells.

[0026] A DC module 3 is also connected to the outside of the battery core assembly 21, and the DC module 3 converts the main circuit 48V into 33V and 5V. The 48V is mainly used to power the motor of the electric bicycle, and the 33V and 5V are mainly used to power the instrument and controller of the electric bicycle;

[0027] A protection plate bracket 4 is installed at one end of the battery cell assembly 21, and a protection plate 5 is installed on the protection plate bracket. By first installing the protection plate on the protection plate bracket and then installing it on the module, the protection plate bracket can be replaced to be compatible with protection plates of different manufacturers, thereby improving the versatility of the product;

[0028] The battery case 1 includes an upper shell 11 and a lower shell 12, and the upper shell and the lower shell are fixed together by fastening screws. A charging connector 111 is provided on the upper shell, and the battery pack is charged through the charging connector;

[0029] The upper shell is provided with screw installation holes, so as to be assembled with the upper shell, and the battery pack can be locked with screws, and a discharge connector 121 is provided at the side end to achieve 48V output as well as 33V and 5V output; the charging connector and the discharge connector are both connected to the internal battery core assembly;

[0030] A handle is installed on the battery shell 1 through a mounting plate. The handle is made of nylon braided tape, which has high toughness, meets the use requirements, and is not easy to be damaged.

[0031] The benefits of the utility model are that the technical solution reduces the gaps between the battery cells by providing the battery cell fixing holes on the upper bracket and the lower bracket, and each group of battery cell fixing holes are distributed in a staggered structure, thereby greatly improving the space utilization rate. At the same time, protruding triangular blocks are provided on the sides of the upper bracket and the lower bracket, and holes and grooves are opened on the triangular blocks to facilitate fixing by fixing parts. The structure is simple and easy to install.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new type of high-capacity lithium battery pack for electric bicycles, comprising a battery housing and a battery cell assembly placed in the battery housing, characterized in that: The battery cell assembly includes a battery cell bracket, a plurality of cylindrical battery cells installed in the battery cell bracket, and a copper busbar placed on the battery cell bracket and connecting the cylindrical battery cells; the battery cell bracket includes an upper bracket and a lower bracket correspondingly arranged up and down, and battery cell fixing holes arranged on the upper bracket and the upper bracket, the battery cell fixing holes on the upper bracket and the lower bracket are arranged one by one, and each group of battery cell fixing holes are distributed in a staggered structure.

2. A new type of high-capacity lithium battery pack for electric bicycles according to claim 1, characterized in that: Protruding triangular blocks are arranged on the sides of the upper bracket and the lower bracket, and holes and slots are opened on the triangular blocks. The triangular blocks of the upper bracket and the lower bracket are arranged in a one-to-one correspondence.

3. A new type of high-capacity lithium battery pack for electric bicycles according to claim 1, characterized in that: A DC module is also connected outside the battery core assembly.

4. A novel high-capacity lithium battery pack for electric bicycles according to claim 1, characterized in that: A protection plate bracket is installed at one end of the battery cell assembly, and a protection plate is installed on the protection plate bracket.

5. The novel high-capacity lithium battery pack for electric bicycle according to claim 1 is characterized in that: The battery housing comprises an upper housing and a lower housing, and the upper housing and the lower housing are fixed together by fastening screws. A charging connector is arranged on the upper housing, screw mounting holes are arranged on the upper housing, and a discharge connector is arranged at the side end.

6. A novel high-capacity lithium battery pack for electric bicycles according to claim 1, characterized in that: A handle is mounted on the battery shell via a mounting plate.

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