Forklift power battery module structure facilitating wiring and avoiding short circuit

Abstract

The utility model discloses a forklift power battery module structure convenient for wiring and capable of avoiding short circuit, and aims to solve the problems that the production difficulty is high, a battery cell is easy to deform and damage, and the short circuit is easy. The battery pack comprises a box body, a plurality of groups of battery cell modules and soft copper bars are arranged in the box body side by side, the adjacent battery cell modules are connected in series through the soft copper bars, each battery cell module comprises a battery cell mounting and limiting assembly, a plurality of battery cells are sequentially stacked in the battery cell mounting and limiting assembly, and the battery cells are connected in series through the soft copper bars. The battery cell mounting and limiting assembly is used for limiting and fixing the battery cells, aluminum sheet connecting assemblies are arranged on tabs of the plurality of battery cells, and the plurality of battery cells are electrically connected through the aluminum sheet connecting assemblies. The battery module is applied to the technical field of battery modules.

Description

Technical Field

[0001] The utility model relates to a battery module structure, in particular to a forklift power battery module structure which is convenient for wiring and avoids short circuit. Background Art

[0002] Nowadays, all countries are vigorously developing green energy. As a new type of energy, lithium-ion batteries have the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, high stability, cleanliness, and environmental protection. They have broad prospects in the field of power batteries, energy storage industry, forklift batteries and other power sources.

[0003] However, the industry has a high degree of customization, and different customers require different battery compartment sizes. Therefore, different types of battery cells need to be selected according to the battery compartment size to meet customer needs. Multiple small-capacity, low-voltage battery cells will be connected in series and parallel to form a large-capacity, high-voltage battery. The existing structure and method of connecting multiple battery cells in series and parallel has the following disadvantages:

[0004] 1. The weight and volume of multiple battery cells connected in series and parallel are very large, which makes it difficult to weld the battery cell module and install it into the battery box.

[0005] 2. Multiple battery cells squeezed against each other can easily cause the battery cells to deform, resulting in damage and leakage, which will affect the battery life and cause safety hazards.

[0006] 3. When multiple battery cells are connected in series or parallel, the positive and negative poles are easily confused, causing the battery cells to short-circuit, increasing the difficulty of production and easily causing safety hazards. Utility Model Content

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a forklift power battery module structure that is convenient for wiring and avoids short circuits, so as to solve the problems of difficult production, easy deformation and damage of the battery cells, and easy short circuits proposed in the above-mentioned background technology.

[0008] The technical solution adopted by the utility model is: the utility model includes a box body, wherein several groups of battery cell modules and soft copper bars are arranged side by side in the box body, adjacent battery cell modules are connected in series through the soft copper bars, the battery cell modules include a battery cell installation limit assembly, several battery cells are stacked in sequence in the battery cell installation limit assembly, the battery cell installation limit assembly is used to limit and fix all the battery cells, aluminum sheet connection assemblies are arranged on the pole ears of several of the battery cells, and several of the battery cells are electrically connected to each other through the aluminum sheet connection assembly.

[0009] This design prevents deformation and damage caused by excessive number of battery cells being squeezed against each other by making the battery cells easier to weld and connect in series and parallel. At the same time, all battery cells in the battery module are fixed and limited by the battery installation limit assembly to prevent battery cell expansion and sheet metal processing errors of the battery installation limit assembly from causing assembly failure, resulting in material waste and extended production time. In addition, the battery modules are connected in series through soft copper busbars. Compared with using cables in series, soft copper busbars have the advantage of lower internal resistance. Compared with using hard copper busbars in series, soft copper busbars can better absorb kinetic energy and avoid the risk of loosening the copper busbar due to long-term bumps, resulting in poor contact and increased resistance leading to high temperature at the series connection.

[0010] Furthermore, the battery cell installation limit assembly includes a bottom support side plate, two end plates and a pressure rod. The bottom support side plate is in the form of a U-shaped groove box. The two end plates are respectively fixed to the two ends of the bottom support side plate by bolts. A number of battery cells are stacked in the bottom support side plate and are located between the two end plates. The pressure rod is installed between the middle parts of the upper ends of the two end plates. The bottom support side plate is used to support the battery cell and limit its left and right movement. The end plate is used to fix the battery cell in the bottom support side plate and limit the forward and backward movement of the battery cell. The pressure rod is used to limit the up and down movement of the battery cell.

[0011] In this design, the battery cells are limited by the bottom support side plates, two end plates and the pressure rod, making the overall disassembly and assembly convenient.

[0012] Furthermore, both sides of the upper end of the end plate are provided with rivet screws and insulators, the insulator is provided with threaded holes adapted to the rivet screws, the insulator is installed on the rivet screws through the threaded holes, and the insulator is used for series connection between battery cell modules.

[0013] Furthermore, the aluminum sheet connection assembly includes three series aluminum sheets and two total positive and negative aluminum sheets, and several of the battery cells are divided into four groups. The positive pole tabs of the battery cells in each group are installed on the same side, and the positive pole tabs of adjacent battery cell groups are installed in opposite directions. The three series aluminum sheets are respectively installed between one side of the first group of battery cell groups and the second group of battery cell groups, between one side of the third group of battery cell groups and the fourth group of battery cell groups, and between the other side of the second group of battery cell groups and the third group of battery cell groups. The two total positive and negative aluminum sheets are respectively installed on the other side of the first group of battery cell groups and the other side of the fourth group of battery cell groups, and the outer edges of the total positive and negative aluminum sheets are provided with waist-shaped holes, which are located at the upper end of the threaded hole, and the two ends of the soft copper bus are respectively adapted to be installed on the upper ends of the waist-shaped holes of adjacent battery cell modules.

[0014] In this design, the positive and negative electrodes of multiple battery cells are connected in parallel by welding the total positive and negative aluminum sheets on the battery cell tabs; multiple battery cells are connected in series by welding the series connection aluminum sheets on the battery cell tabs, and the battery cell modules are connected in series through soft copper busbars and the total positive and negative aluminum sheets.

[0015] Furthermore, a nickel layer is provided on the surface of the series-connected aluminum sheet, and the nickel layer can effectively prevent the large current between the battery modules from causing oxidation of the series-connected aluminum sheet and affecting the overall performance of the battery.

[0016] Furthermore, foam cotton is pasted between the end plate and the battery core and between the pressure rod and the battery core, and epoxy board is pasted between the bottom bracket side plate and the battery core.

[0017] This design is used to absorb the kinetic energy generated when the vehicle moves after the battery is loaded into the vehicle body, thereby protecting the battery cells.

[0018] Furthermore, the pressure rod includes a first cross bar and a first vertical bar located at both ends of the first cross bar. A notch located between two rivet screws is provided in the middle of the upper end of the end plate. The two first vertical bars respectively pass through the notches of the two end plates and are fixed to the middle of the lower end of the end plate.

[0019] Furthermore, a peripheral edge is arranged around the inner part of the upper end of the box body, and a box cover matched with the box body is arranged on the peripheral edge.

[0020] In this design, the battery box is closed by a box cover; the box cover is fixed by a surrounding edge support.

[0021] The beneficial effects of the utility model are: by dividing a large number of battery cells into multiple small number of battery cell modules, it is avoided that too many battery cells squeeze each other and cause deformation and damage, avoids battery cell expansion and sheet metal processing errors that lead to assembly failure, causing material waste and extended production time, and avoids the risk of short circuit caused by confusion of positive and negative poles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 It is an explosion schematic diagram of the utility model;

[0024] Figure 3 This is a schematic diagram of the explosion of the battery module;

[0025] Figure 4 It is a schematic diagram of the circuit connection between battery modules. DETAILED DESCRIPTION

[0026] like Figures 1 to 4As shown, in this embodiment, the utility model includes a box body 1, in which several groups of battery cell modules 2 and soft copper busbars 3 are arranged side by side, and adjacent battery cell modules 2 are connected in series through the soft copper busbars 3, and the battery cell module 2 includes a battery cell installation limit assembly 4, in which several battery cells 5 are stacked in sequence, and the battery cell installation limit assembly 4 is used to limit and fix all the battery cells 5, and aluminum sheet connection assemblies 6 are arranged on the pole ears of several of the battery cells 5, and the several battery cells 5 are electrically connected to each other through the aluminum sheet connection assembly 6.

[0027] In this embodiment, the battery cell installation limit assembly 4 includes a bottom support side plate 41, two end plates 42 and a pressure rod 43. The bottom support side plate 41 is in a U-shaped groove box, and the two end plates 42 are respectively fixed to the two ends of the bottom support side plate 41 by bolts. A plurality of battery cells 5 are adapted to be stacked in the bottom support side plate 41 and located between the two end plates 42. The pressure rod 43 is installed between the middle parts of the upper ends of the two end plates 42. The bottom support side plate 41 is used to support the battery cell 5 and limit its left and right movement. The end plate 42 is used to fix the battery cell 5 in the bottom support side plate 41 and limit the forward and backward movement of the battery cell 5. The pressure rod 43 is used to limit the up and down movement of the battery cell 5.

[0028] In this embodiment, both sides of the upper end of the end plate 42 are provided with self-clinching screws 44 and insulators 45. The insulator 45 is provided with threaded holes matched with the self-clinching screws 44, and the insulator 45 is installed on the self-clinching screws 44 through the threaded holes.

[0029] In this embodiment, the aluminum sheet connection assembly 6 includes three series aluminum sheets 61 and two total positive and negative aluminum sheets 62, and the plurality of battery cells 5 are divided into four groups. The positive pole tabs of the battery cells 5 in each group are installed on the same side, and the positive pole tabs of adjacent battery cell groups are installed in opposite directions. The three series aluminum sheets 61 are respectively installed between one side of the first group of battery cell groups and the second group of battery cell groups, between one side of the third group of battery cell groups and the fourth group of battery cell groups, and between the other side of the second group of battery cell groups and the third group of battery cell groups. The two total positive and negative aluminum sheets 62 are respectively installed on the other side of the first group of battery cell groups and the other side of the fourth group of battery cell groups, and the outer edges of the total positive and negative aluminum sheets 62 are provided with waist-shaped holes 621, and the waist-shaped holes 621 are located at the upper end of the threaded hole, and the two ends of the soft copper busbar 3 are respectively adapted to be installed on the upper ends of the waist-shaped holes 621 of the adjacent battery cell modules 2.

[0030] In this embodiment, a nickel layer is provided on the surface of the series-connected aluminum sheet 61 .

[0031] In this embodiment, foam cotton is attached between the end plate 42 and the battery core and between the pressure rod 43 and the battery core, and epoxy board is attached between the bottom support side plate 41 and the battery core.

[0032] In this embodiment, the pressure rod 43 includes a first cross bar and a first vertical bar located at both ends of the first cross bar. A notch located between two rivet screws 44 is provided in the middle of the upper end of the end plate 42. The two first vertical bars respectively pass through the notches of the two end plates 42 and are fixed to the middle of the lower end of the end plate 42.

[0033] In this embodiment, a peripheral edge 7 is provided around the inner part of the upper end of the box body 1, and a box cover 8 adapted to the box body 1 is provided on the peripheral edge; the battery box body 1 and the peripheral edge 7 are fixed by screws, and the peripheral edge 7 is used to support the assembly of the box cover 8, and the peripheral edge 7 and the box cover 8 are fixed by screws, and the box cover 8 is used to close the battery box body 1.

[0034] During implementation, multiple electrodes 5 are placed inside the bottom support side plate 41, and then an end plate 42 is placed at each end of the bottom support side plate 41, and then the two end plates 42 are fixed to the bottom support side plate 41 using flat head screws and nuts; then an insulator 45 is installed on each of the two end plates 42, and the insulator 45 has its own thread, which is rotatably installed on the rivet screw 44 above the end plate 42; the total positive and negative aluminum sheets 62 and the series aluminum sheets 61 are welded to the pole ears of the battery cell 2 by a laser welding machine; the position of the waist-shaped holes 623 of the total positive and negative aluminum sheets 62 should correspond to the threaded holes of the insulator 303; then the two ends of the pressure rod 43 are fixed to the screws at the bottom of the two end plates 42 by nuts; then the installed battery cell module 2 is fixed in the battery box 1 by the screws on the bottom surface of the battery box 1 and the nuts; then the soft copper busbar 3 is fixed to the insulator 45 using screws, so that the soft copper busbar 3 is in contact with the total positive and negative aluminum sheets 62, so as to realize the series connection between the battery cell modules 2.

[0035] In this embodiment, the battery cell module 2 has a high charge and discharge utilization rate, can be mass-produced, and the positions of the positive and negative electrodes are clear, thus avoiding the risk of short circuit and making wiring more convenient.

[0036] Working principle: The utility model divides the battery cells into multiple battery cell modules according to the total battery voltage and total capacity, and assembles them uniformly; then the battery modules are placed inside the battery box, and then the battery modules are fixed with screws and nuts. Then the soft copper bar is fixed to the insulator by screws, so that the soft copper bar contacts the total positive and negative aluminum sheets, and the modules are connected in series. The four surrounding edges are fixed inside the battery box by screws. After fixing, the box cover is placed on the surrounding edges and fixed by screws to close the battery box, and finally the use of the battery module structure is completed.

[0037] The utility model is applied to the technical field of battery modules.

[0038] Although the embodiments of the present invention are described with practical solutions, they do not constitute limitations on the meaning of the present invention. For those skilled in the art, it is obvious to modify the implementation scheme and combine it with other solutions based on this description.

Claims

1. A forklift power battery module structure that facilitates wiring and avoids short circuits, comprising a box (1), characterized in that: A plurality of groups of battery modules (2) and soft copper bars (3) are arranged side by side in the box body (1), and adjacent battery modules (2) are connected in series via the soft copper bars (3). The battery module (2) comprises a battery installation limiting assembly (4), and a plurality of battery cells (5) are sequentially stacked in the battery installation limiting assembly (4). The battery installation limiting assembly (4) is used to limit and fix all the battery cells (5). Aluminum sheet connection assemblies (6) are arranged on the tabs of the plurality of battery cells (5), and the plurality of battery cells (5) are electrically connected to each other via the aluminum sheet connection assembly (6).

2. A forklift power battery module structure that facilitates wiring and avoids short circuit according to claim 1, characterized in that: The battery cell installation limiting assembly (4) comprises a bottom supporting side plate (41), two end plates (42) and a pressure rod (43); the bottom supporting side plate (41) is in the form of a U-shaped groove box; the two end plates (42) are respectively fixed to the two ends of the bottom supporting side plate (41) by bolts; a plurality of battery cells (5) are stacked in the bottom supporting side plate (41) and located between the two end plates (42); the pressure rod (43) is installed between the middle parts of the upper ends of the two end plates (42); the bottom supporting side plate (41) is used to support the battery cell (5) and limit its left and right movement; the end plate (42) is used to fix the battery cell (5) in the bottom supporting side plate (41) and limit the forward and backward movement of the battery cell (5); and the pressure rod (43) is used to limit the upward and downward movement of the battery cell (5).

3. A forklift power battery module structure that facilitates wiring and avoids short circuit according to claim 2, characterized in that: Both sides of the upper end of the end plate (42) are provided with a self-clinching screw (44) and an insulator (45); the insulator (45) is provided with a threaded hole matched with the self-clinching screw (44); the insulator (45) is installed on the self-clinching screw (44) through the threaded hole.

4. A forklift power battery module structure that facilitates wiring and avoids short circuit according to claim 3, characterized in that: The aluminum sheet connection assembly (6) comprises three series-connected aluminum sheets (61) and two total positive and negative aluminum sheets (62). The plurality of battery cells (5) are divided into four groups. The positive pole tabs of the battery cells (5) of each group are installed on the same side. The positive pole tabs of adjacent battery cell groups are installed in opposite directions. The three series-connected aluminum sheets (61) are respectively installed between one side of the first battery cell group and the second battery cell group, between one side of the third battery cell group and the fourth battery cell group, and between the other side of the second battery cell group and the third battery cell group. The two total positive and negative aluminum sheets (62) are respectively installed on the other side of the first battery cell group and the other side of the fourth battery cell group. The outer edges of the total positive and negative aluminum sheets (62) are both provided with waist-shaped holes (621). The waist-shaped holes (621) are located at the upper ends of the threaded holes. The two ends of the soft copper busbar (3) are respectively adapted to be installed at the upper ends of the waist-shaped holes (621) of the adjacent battery cell modules (2).

5. A forklift power battery module structure that facilitates wiring and avoids short circuit according to claim 4, characterized in that: The surface of the series-connected aluminum sheet (61) is provided with a nickel coating.

6. A forklift power battery module structure that facilitates wiring and avoids short circuit according to claim 2, characterized in that: Foam is pasted between the end plate (42) and the battery core and between the pressure rod (43) and the battery core, and an epoxy board is pasted between the bottom support side plate (41) and the battery core.

7. A forklift power battery module structure that facilitates wiring and avoids short circuit according to claim 3, characterized in that: The compression rod (43) comprises a first cross bar and first vertical rods located at both ends of the first cross bar. A notch located between two rivet screws (44) is provided in the middle of the upper end of the end plate (42). The two first vertical rods respectively pass through the notches of the two end plates (42) and are fixed to the middle of the lower end of the end plate (42).

8. The forklift power battery module structure that facilitates wiring and avoids short circuit according to claim 1 is characterized in that: The upper end of the box body (1) is provided with a peripheral edge (7) around the inside, and a box cover (8) adapted to the box body (1) is provided on the peripheral edge.

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