Novel lithium battery pack

Abstract

The utility model discloses a novel lithium battery pack and relates to the technical field of lithium batteries. The novel lithium battery pack comprises 18650 cylindrical lithium ion cells, a cell fixing bracket, a bus nickel sheet, a bus plate, a flame-retardant epoxy resin plate, a connecting wire harness, a battery management unit and a bottom plate, all the 18650 cylindrical lithium ion battery cells are arranged in the battery cell fixing bracket and are distributed in a honeycomb shape, and the distance between every two 18650 cylindrical lithium ion battery cells is 1mm. According to the novel lithium battery pack, the three battery packs are uniformly arranged in a manner that the bracket is vertically arranged, the 18650 cylindrical lithium ion battery cells are horizontally arranged, the arrangement directions of the 18650 cylindrical lithium ion battery cells are highly consistent, the structure is compact, the space utilization rate is high, and large-current output can be provided through busbar connection; the battery pack adopts a modular design, has a simple structure, is convenient to maintain and replace, and ensures the maintainability of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and specifically relates to a new type of lithium battery pack. Background Art

[0002] A lithium battery pack is formed by arranging and combining multiple lithium battery cells, connecting them with metal conductors, and combining them in series and parallel ways to store and provide electrical energy; the connection methods of the battery cells are divided into series and parallel. The battery pack increases the rated voltage of the battery through series connection and increases the capacity and the tolerable output current of the battery pack through parallel connection. Among them, it is required that the number of battery cells in each string of the battery pack is the same, and the voltage, internal resistance, and capacity between single battery cells are the same; therefore, a new type of lithium battery pack is provided to solve the above problems. Content of the Utility Model

[0003] The purpose of the utility model is to provide a new type of lithium battery pack, which can solve the technical problems of low space utilization rate and small capacity of the existing conventional battery pack forming methods.

[0004] To achieve the above purpose, the utility model provides the following technical solution: a new type of lithium battery pack, including 18650 cylindrical lithium-ion battery cells, a battery cell fixing bracket, a current collecting nickel sheet, a current collecting plate, a flame-retardant epoxy resin plate, fixing bolts, a connecting wire harness, a battery management unit, and a bottom plate; all the 18650 cylindrical lithium-ion battery cells are installed in the battery cell fixing bracket and arranged in a honeycomb shape, and the distance between each 18650 cylindrical lithium-ion battery cell is 1 mm; the current collecting plate is used to connect the 18650 cylindrical lithium-ion battery cells in parallel by resistance welding to form 3 single modules; a tab is connected to the current collecting nickel sheet, and the tab is fixed on the current collecting plate and connected in series through the current collecting plate to form a battery pack, which is connected to the battery management unit by using a connecting wire harness and outputs through the battery management unit.

[0005] Preferably, the battery cell fixing bracket is completely matched with the current collecting nickel sheet and the 18650 cylindrical lithium-ion battery cell, and the current collecting nickel sheet and the 18650 cylindrical lithium-ion battery cell are respectively detachably embedded in the accommodating groove.

[0006] Preferably, the number of 18650 cylindrical lithium-ion battery cells in each single module is 44, and a total of 132 for 3 single modules.

[0007] Preferably, the current collecting nickel sheets are all formed by nickel-plated steel sheets.

[0008] Preferably, the battery cell fixing brackets are all formed by PP + ABS materials.

[0009] Preferably, the current collecting plate is a single-layer 1.6 mm PCB board with copper foil spraying tin.

[0010] Preferably, the cell mounting aperture of the cell fixing bracket is customized according to the outer diameter of the cylindrical lithium-ion cell; the mounting holes are arranged in a honeycomb staggered pattern; the gap between the holes is mm, and both the cylindrical lithium-ion cell and the cell fixing bracket are fixed with glue.

[0011] Preferably, after the single modules are grouped, all the cell fixing brackets are placed vertically, the cylindrical lithium-ion cells are placed horizontally, and a flame-retardant epoxy resin board is provided between each group of single modules for insulation.

[0012] Preferably, three identical single modules are neatly installed in the bottom plate and fixed to the bottom plate by bolts through the flame-retardant epoxy resin board.

[0013] Preferably, the cylindrical lithium-ion cell is a lithium thionyl chloride battery, which belongs to a primary battery pack.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: This new type of lithium battery pack has a total of 3 series battery packs. The unified bracket is placed vertically, the 18650 cylindrical lithium-ion cells are placed horizontally, and the arrangement directions of the 18650 cylindrical lithium-ion cells are highly consistent. The structure is compact and the space utilization rate is high. It can provide large current output through connection with a busbar; the battery pack is modularly designed, with a simple structure, convenient for battery pack maintenance and replacement, and ensuring the maintainability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an exploded view of the present utility model;

[0016] Figure 2 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 3 is a schematic diagram of the structure of a single module of the present utility model.

[0018] In the figure: 1. Single module; 101. 18650 cylindrical lithium-ion cell; 102. Cell fixing bracket; 103. Busbar nickel sheet; 2. Bottom plate; 3. Battery management unit; 4. Flame-retardant epoxy resin board; 5. Tab; 6. Busbar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] It should be noted that all directional indicators in the embodiments of the present utility model, such as up, down, left, right, front, back... are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture as shown in the attached drawings. If this specific posture changes, the directional indicators will change accordingly.

[0021] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0022] The present utility model proposes a practical new lithium battery pack

[0023] As Figures 1 to 3 shown, in an embodiment of the present utility model, the practical new lithium battery pack includes a flame-retardant epoxy resin board 4, 18650 cylindrical lithium-ion battery cells 101, a current-collecting nickel sheet 103, fixing bolts, connection wire harnesses, and a battery cell fixing bracket 102; the 18650 cylindrical lithium-ion battery cells 101 are fixed in the battery cell fixing bracket 102, the current-collecting nickel sheet 103 is welded by resistance welding, the connection wire harnesses output are welded to the positive and negative electrodes of the battery pack and connected to the battery management unit 3, and the flame-retardant epoxy resin board 4 is pasted between each group of single modules 1; a tab 5 is connected to the current-collecting nickel sheet 103, the tab 5 is fixed on the current-collecting plate 6, and the battery cells are connected in series through the current-collecting plate 6 to form a battery pack, which is connected to the battery management unit 3 using the connection wire harnesses and output through the battery management unit 3.

[0024] In this embodiment, the 18650 cylindrical lithium-ion battery cells 101 all use 18505 lithium thionyl chloride battery cells;

[0025] In this embodiment, the battery cell fixing bracket 102 is all formed of PP + ABS material, which is heat-resistant, impact-resistant, can provide sufficient structural strength, and is light in weight; the battery cell fixing bracket 102 is completely matched with the 18650 cylindrical lithium-ion battery cells 101, and the gap between each 18650 cylindrical lithium-ion battery cell 101 is 1 mm after assembly, which is convenient for the overall heat dissipation of the single module 1;

[0026] In this embodiment, the current-collecting nickel sheet 103 is all formed of nickel-plated steel sheet, and the nickel-plated layer can improve the surface strength and corrosion resistance of the current-collecting nickel sheet 103.

[0027] In this embodiment, the bottom plate 2 is made of aluminum alloy and is processed by machining, with low material cost and light weight.

[0028] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A new type of lithium battery pack, characterized in that, It includes 18650 cylindrical lithium-ion battery cells (101), battery cell fixing brackets (102), busbar nickel sheets (103), busbars (6), flame-retardant epoxy resin boards (4), battery management units (3), fixing bolts and connecting wire harnesses. The 18650 cylindrical lithium-ion battery cells (101) are neatly installed in the battery cell fixing brackets (102). The busbar nickel sheets (103) are welded to the 18650 cylindrical lithium-ion battery cells (101) by resistance welding to complete parallel connection into a single module (1). A tab (5) is connected to the busbar nickel sheet (103), and the tab (5) is fixed on the busbar (6) and connected in series through the busbar (6) to form a battery pack, which is connected to the battery management unit (3) using a connecting wire harness and output through the battery management unit (3).

2. A novel lithium battery pack according to claim 1, wherein: The lithium battery pack is modularly designed, with a total of 3 single modules (1), and each group has 44 18650 cylindrical lithium-ion battery cells (101).

3. A novel lithium battery pack according to claim 2, characterized in that: The battery cell fixing bracket (102) is formed of a PP + ABS material.

4. A novel lithium battery pack according to claim 3, wherein: The number of the 18650 cylindrical lithium-ion battery cells (101) is set to 132, and the grouping method is 3 series and 44 parallel.

5. A novel lithium battery pack according to claim 4, characterized in that: The battery cell installation hole diameter of the battery cell fixing bracket (102) is customized according to the outer diameter of the 18650 cylindrical lithium-ion battery cell (101); the installation hole positions are arranged in a honeycomb-shaped staggered manner; the gap between the hole positions is 1 mm, and both the 18650 cylindrical lithium-ion battery cell (101) and the battery cell fixing bracket (102) are fixed with glue.

6. A novel lithium battery pack according to claim 5, wherein: After the single module (1) is grouped, all the battery cell fixing brackets (102) are placed vertically, the 18650 cylindrical lithium-ion battery cells (101) are placed horizontally, and a flame-retardant epoxy resin board (4) is provided between each group of single modules (1) for insulation.

7. A novel lithium battery pack according to claim 6, characterized in that: Three identical single modules (1) are neatly installed in the bottom plate (2) and fixed to the bottom plate by the flame-retardant epoxy resin board (4) and bolts.

8. A novel lithium battery pack according to claim 7, characterized in that: The 18650 cylindrical lithium-ion battery cell (101) is a lithium thionyl chloride battery, belonging to a primary battery pack.

Images