Battery cell fixing structure of small lithium battery pack

Abstract

The utility model discloses a battery cell fixing structure of a small lithium battery pack, which comprises a shell, a baffle plate is arranged on one side in the shell, and a plurality of battery cells are uniformly arranged between the baffle plate and the shell; a plate body is installed between the bottom of the inner side of the shell and the lower surface of the battery cell, second buffer foam is evenly installed between the inner side wall of the shell and the side face of the battery cell, the battery cell and the shell can be effectively isolated through the insulated plate body and the buffer foam, and then the position of the battery cell is fixedly limited through the buffer foam and a pressing strip; and the occurrence of electric leakage and even fire caused by short circuit can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a cell fixing structure for a small lithium battery pack. Background Technology

[0002] A lithium battery pack typically consists of a positive electrode, a negative electrode, an electrolyte, a separator, and a battery casing. It is usually composed of multiple battery cells and also includes a battery management system. Lithium battery pack casings are made of two materials: aluminum and steel, resulting in either soft-pack or hard-pack designs.

[0003] When making battery cells into battery packs, it is crucial to ensure insulation between the battery cells and the casing, because the casing is made of metal and is a conductor of electricity. Poor insulation can easily lead to leakage or even short circuits and fires.

[0004] To address this, a cell fixing structure for a small lithium battery pack is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a cell fixing structure for a small lithium battery pack to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cell fixing structure for a small lithium battery pack, including a shell, a baffle installed on one side of the inner side of the shell, and multiple cells evenly installed between the baffle and the shell;

[0007] A plate is installed between the bottom inner side of the outer casing and the lower surface of the battery cell, and a second buffer foam is evenly installed between the inner wall of the outer casing and the side of the battery cell.

[0008] A pressure strip is installed on the top of the battery cell, and a first buffer foam is installed between the pressure strip and the battery cell.

[0009] Preferably, one end of the pressure strip is connected to the baffle by bolts.

[0010] Preferably, the other end of the pressure strip is provided with a countersunk hole.

[0011] Preferably, a fixing plate is installed on one side of the outer casing.

[0012] Preferably, the fixing plate is screwed with a limiting bolt, and the limiting bolt is adapted to the countersunk hole.

[0013] Preferably, the board body is made of insulating material, specifically epoxy board.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the insulating board and the buffer foam can effectively isolate the battery cell from the outer shell, and the position of the battery cell can be fixed and restricted by the buffer foam and the pressure strip, which can effectively prevent leakage or even short circuit and fire. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This utility model Figure 1 Enlarged structural diagram of area A in the middle;

[0017] Figure 3 This utility model Figure 1 Enlarged structural diagram of region B in the middle;

[0018] Figure 4 This is a cross-sectional structural diagram of the outer shell of this utility model.

[0019] In the diagram: 1. Outer shell; 2. Baffle; 3. Battery cell; 4. Pressure strip; 5. First buffer foam; 6. Second buffer foam; 7. Countersunk hole; 8. Fixing plate; 9. Limiting bolt; 10. Plate body. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Please see Figure 1-4 This utility model provides a technical solution: a cell fixing structure for a small lithium battery pack, including a shell 1, a baffle 2 installed on one side of the inside of the shell 1, and multiple cells 3 evenly installed between the baffle 2 and the shell 1.

[0022] A plate 10 is installed between the bottom inner side of the outer casing 1 and the lower surface of the battery cell 3, and a second buffer foam 6 is evenly installed between the inner wall of the outer casing 1 and the side of the battery cell 3.

[0023] A pressure strip 4 is installed on the top of the battery cell 3, and a first buffer foam 5 is installed between the pressure strip 4 and the battery cell 3.

[0024] like Figure 1 and Figure 2 As shown: One end of the pressure bar 4 is connected to the baffle 2 by bolts; with the above settings, one end of the pressure bar 4 is fixed by bolts, and the position of the battery cell 3 can be restricted by the pressure bar 4.

[0025] like Figure 1 and Figure 3As shown: The other end of the pressure bar 4 is provided with a countersunk hole 7; through the above settings, the countersunk hole 7 and the limiting bolt 9 can restrict the position of the other end of the pressure bar 4, thereby restricting the position of the battery cell 3.

[0026] like Figure 3 As shown: A fixing plate 8 is installed on one side of the outer casing 1; through the above settings, the fixing plate 8 can restrict and fix the position of the limiting bolt 9.

[0027] like Figure 3 As shown: The fixing plate 8 is screwed with a limiting bolt 9, which is adapted to the countersunk hole 7; through the above settings, the bottom end of the limiting bolt 9 is adapted to the countersunk hole 7, thus restricting the position of one end of the pressure strip 4.

[0028] like Figure 4 As shown: Board 10 is made of insulating material, specifically epoxy board.

[0029] Working principle: Making the battery cell 3 square is crucial to ensuring insulation between the battery cell 3 and the outer casing 1, because the outer casing 1 is a metal conductor. Poor insulation can easily lead to leakage or even short circuits and fires.

[0030] First, place an insulating epoxy board 10 at the bottom of the outer shell 1. Then, attach the corresponding insulating second buffer foam 6 to the inner wall of the cavity of the discharge core 3. Then, arrange the battery cores 3 as shown in the figure. Since each battery core 3 has an insulating blue film attached to its outer surface, the battery cores 3 are insulated from each other and no additional insulating material is needed to separate them. Because the foam is an elastic material, the battery core 3 is squeezed tightly around its perimeter after it is placed, thus fixing the perimeter and bottom surface.

[0031] Next is the top surface fixing; since the battery cell terminals are on the top surface, fixing them is more complicated. The method for fixing the top surface is as follows: first, attach the first buffer foam 5 to the battery cell 3, then place the metal pressure strip 4 on the first buffer foam 5, and fix both ends with corresponding bolts. When tightening the bolts, apply the specified torque to prevent the bolts from loosening. In this way, all the battery cells 3 are fixed in the battery box.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cell fixing structure for a small lithium battery pack, comprising a housing (1), characterized in that: A baffle (2) is installed on one side of the inner side of the outer casing (1), and multiple battery cells (3) are evenly installed between the baffle (2) and the outer casing (1); A plate (10) is installed between the bottom inner side of the outer shell (1) and the lower surface of the battery cell (3), and a second buffer foam (6) is evenly installed between the inner wall of the outer shell (1) and the side of the battery cell (3). A pressure strip (4) is installed on the top of the battery cell (3), and a first buffer foam (5) is installed between the pressure strip (4) and the battery cell (3).

2. The cell fixing structure of a small lithium battery pack according to claim 1, characterized in that: One end of the pressure strip (4) is connected to the baffle (2) by bolts.

3. The cell fixing structure of a small lithium battery pack according to claim 2, characterized in that: The other end of the pressure strip (4) is provided with a countersunk hole (7).

4. The cell fixing structure of a small lithium battery pack according to claim 3, characterized in that: A fixing plate (8) is installed on one side of the outer casing (1).

5. The cell fixing structure of a small lithium battery pack according to claim 4, characterized in that: The fixing plate (8) is screwed with a limiting bolt (9), which is adapted to the countersunk hole (7).

6. The cell fixing structure of a small lithium battery pack according to claim 1, characterized in that: The plate (10) is made of insulating material, specifically an epoxy board.

Images