High-toughness lithium battery module connecting copper bar

Abstract

The utility model belongs to the technical field of copper bars for lithium battery modules, and discloses a high-toughness lithium battery module connecting copper bar, which is formed by superposing a plurality of strip-shaped copper foils and comprises a first copper bar, the first copper bar is vertically connected with a second copper bar, the second copper bar is transversely connected with a third copper bar, the third copper bar is vertically connected with a fourth copper bar, and the fourth copper bar is transversely connected with a third copper bar. The fourth copper bar is transversely connected with a fifth copper bar, and the fifth copper bar is vertically connected with a sixth copper bar; the top surfaces of the first copper bar and the sixth copper bar are provided with nickel sheets, and the heads of the first copper bar and the sixth copper bar are provided with through connection round holes. The surfaces of the second copper bar, the third copper bar, the fourth copper bar and the fifth copper bar are wrapped with protective tubes. The lithium battery module has the characteristics of compact structure, good toughness, convenience in connection, stability and reliability in connection and the like, and can be widely applied to the technical field of lithium battery module production of industrial vehicles.

Description

Technical Field

[0001] The utility model belongs to the technical field of copper bars for lithium battery modules, and in particular relates to a high-toughness copper bar for connecting lithium battery modules. Background Art

[0002] Since the beginning of the 21st century, with the rapid development of the industrial economy and logistics industry, the application rate of industrial handling vehicles has become increasingly higher. Indeed, as the government has increased its efforts in environmental protection, new energy industrial vehicles such as hybrid and pure electric power have been greatly developed. Lithium batteries have been widely used in mobile phones, laptops, power tools, new energy vehicles (engineering vehicles) and street lamp backup power supplies. As an important power source for new energy industrial vehicles, lithium power batteries have gradually begun to replace lead-acid batteries due to their high energy density, low self-discharge rate, strong high and low temperature adaptability and green environmental protection. For high-voltage lithium power battery packs, multiple groups of battery modules are often required to be connected in series and parallel to form the entire high-voltage circuit, and copper bars are required to connect the battery modules.

[0003] At present, the existing connecting copper bars mainly include hard copper bars and laminated soft copper bars. The hard copper bars have the characteristics of high strength, simple production, and low cost, but their toughness is poor and they are not suitable for multi-module connection methods that require turning. The existing laminated soft copper bars have a simple structure, while the complex bent soft copper bars adopt a multi-segment connection method. For example, patent application number "201822111658.6" discloses a copper bar and a battery pack for connecting a battery module, including a first copper bar and a second copper bar, wherein one end of the first copper bar and one end of the second copper bar are connected to form a connecting segment. This structural connection operation is not convenient and has poor toughness, and the outside lacks heat shrink tube protection that fits the structure tightly, which cannot meet the safe and reliable connection requirements of high-power lithium battery modules. Therefore, the existing structure of connecting copper bars for lithium battery modules needs to be further improved. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a high-toughness lithium battery module connecting copper busbar, which has the characteristics of compact structure, good toughness, convenient connection, stable and reliable connection, and can be widely used in the technical field of lithium battery module production for industrial vehicles.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a high-toughness lithium battery module connecting copper bar, composed of a plurality of superimposed strips of copper foil, including a first copper bar, the first copper bar is vertically connected to the second copper bar, the second copper bar is horizontally connected to the third copper bar, the third copper bar is vertically connected to the fourth copper bar, the fourth copper bar is horizontally connected to the fifth copper bar, and the fifth copper bar is vertically connected to the sixth copper bar; the top surfaces of the first copper bar and the sixth copper bar are provided with nickel sheets, and the heads are provided with penetrating connecting circular holes; the surfaces of the second copper bar, the third copper bar, the fourth copper bar and the fifth copper bar are wrapped with protective tubes.

[0006] As an improvement, the strip copper foil has equal width and thickness.

[0007] As an improvement, the strip copper foil has a width of 20-30 mm and a thickness of ≤0.1 mm.

[0008] As an improvement, the first copper bar, the second copper bar, the third copper bar, the fourth copper bar, the fifth copper bar and the sixth copper bar are integral copper foil stacking structures, and are prepared by bending and shaping, and have rounded bending corners.

[0009] As an improvement, the radius of the bending corner is R5~R8mm.

[0010] As an improvement, the width of the nickel sheet is equal to the width of the strip copper foil.

[0011] As an improvement, the nickel sheet has a thickness of 0.1-0.2 mm.

[0012] As an improvement, the connecting circular hole is located at the center of the copper busbar and has a diameter of φ8~φ10mm.

[0013] As an improvement, the protection tube is a flame-retardant heat shrink tube with a thickness of 1 mm and a temperature resistance of 150°C. After instant heat shrinkage in a 250°C oven, it fits tightly to the connecting copper busbar.

[0014] The beneficial effects of the utility model are: a high-toughness lithium battery module connecting copper busbar, which has the characteristics of compact structure, good toughness, convenient connection and stable and reliable connection. It is formed by superimposing ultra-thin copper foil sheets of less than 0.1 mm in an overall structure and then mechanically folding them, avoiding the tedious operation of using a slot connection structure to form multiple bends, thereby improving the production efficiency of copper busbars with complex structures; by using a 1mm thin heat shrink tube as a protective tube, the heat shrinkage makes the connection tighter, avoiding the movement and displacement of the heat shrink tube; in addition, due to the use of ultra-thin copper foil, the overall toughness of the copper busbar is better, and the connection of the lithium battery module is more convenient and beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the high-toughness lithium battery module connecting copper bar structure of the utility model;

[0016] Figure 2 This is the front view of the high-toughness lithium battery module connection copper bar of the utility model;

[0017] Figure 3 This is a top view of the high-toughness lithium battery module connection copper bar of the utility model;

[0018] Figure 4 It is a cross-sectional view of a high-toughness lithium battery module connection copper bar of the utility model.

[0019] In the figure: 1. first copper bar; 2. second copper bar; 3. third copper bar; 4. fourth copper bar; 5. fifth copper bar; 6. sixth copper bar; 7. nickel sheet; 8. connecting round hole; 9. protective tube; 10. bent round corner. DETAILED DESCRIPTION

[0020] Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0021] like Figure 1-4 As shown, a high-toughness lithium battery module connecting copper bar of the present embodiment is composed of a plurality of superimposed copper foil strips, including a first copper bar 1, the first copper bar 1 is vertically connected to the second copper bar 2, the second copper bar 2 is horizontally connected to the third copper bar 3, the third copper bar 3 is vertically connected to the fourth copper bar 4, the fourth copper bar 4 is horizontally connected to the fifth copper bar 5, and the fifth copper bar 5 is vertically connected to the sixth copper bar 6; a nickel sheet 7 is provided on the top surface of the first copper bar 1 and the sixth copper bar 6, and a penetrating connecting circular hole 8 is provided on the head; the surfaces of the second copper bar 2, the third copper bar 3, the fourth copper bar 4 and the fifth copper bar 5 are wrapped with a protective tube 9.

[0022] Furthermore, the strip copper foil has the same width and thickness; specifically, the strip copper foil has a width of 20-30 mm and a thickness of ≤0.1 mm, wherein the width is preferably 25 mm and the thickness is preferably 0.1 mm; more specifically, the copper busbar composed of a 0.1 mm thick strip copper foil has a thickness of 2-4 mm, preferably 3 mm, thereby ensuring that the connected copper busbar has good electrical conductivity and better toughness.

[0023] Furthermore, the first copper bar 1, the second copper bar 2, the third copper bar 3, the fourth copper bar 4, the fifth copper bar 5 and the sixth copper bar 6 are integral copper foil superposition structures and are prepared by bending and shaping; specifically, the first copper bar 1, the second copper bar 2, the third copper bar 3, the fourth copper bar 4, the fifth copper bar 5 and the sixth copper bar 6 are respectively completed by six bending processes, and a bending radius 10 is formed at the bending position, and the curvature of the bending radius 10 is R5~R8mm; more specifically, the bending radius 10 is quickly bent by instantaneous high temperature and pressurization, thereby further improving the production efficiency of connecting copper bars.

[0024] Furthermore, the width of the nickel sheet 7 is equal to the width of the strip copper foil; specifically, the width of the nickel sheet 7 is preferably 25 mm, the thickness is 0.1-0.2 mm, preferably 0.1 mm, and the nickel sheet 7 fully wraps the outer surface of the first copper bar 1 and the sixth copper bar 6, and the wrapping length is 30-40 mm, preferably 35 mm, thereby improving the connection strength of the head and ensuring that the copper foil will not spread out from the head.

[0025] Furthermore, the connecting circular hole 8 is located at the center of the copper busbar and has a diameter of φ8-φ10 mm, preferably φ9 mm; the lithium battery modules are connected through the connecting circular hole 8, which has better adaptability, especially for lithium battery modules in different positions.

[0026] Furthermore, the protection tube 9 is a flame-retardant heat shrink tube with a thickness of 1 mm and a temperature resistance of 150°C. After instantaneous heat shrinkage in a 250°C oven, it fits tightly to the connecting copper busbar, thereby making the fit tighter after heat shrinkage and avoiding the movement and displacement of the heat shrink tube. Specifically, the protection tube 9 has excellent pressure resistance: AC2000V / 50Hz / 1min, and the flame retardancy reaches HB level, avoiding breakdown and combustion problems.

[0027] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art from the present invention should be considered as the protection scope of the present invention.

Claims

1. A high-toughness lithium battery module connecting copper bar, composed of a plurality of copper foil strips stacked together, characterized in that: The invention comprises a first copper bar (1), wherein the first copper bar (1) is vertically connected to a second copper bar (2), the second copper bar (2) is horizontally connected to a third copper bar (3), the third copper bar (3) is vertically connected to a fourth copper bar (4), the fourth copper bar (4) is horizontally connected to a fifth copper bar (5), and the fifth copper bar (5) is vertically connected to a sixth copper bar (6); a nickel sheet (7) is provided on the top surface of the first copper bar (1) and the sixth copper bar (6), and a connecting circular hole (8) is provided through the head; and the surfaces of the second copper bar (2), the third copper bar (3), the fourth copper bar (4) and the fifth copper bar (5) are wrapped with a protective tube (9).

2. The high-toughness lithium battery module connecting copper bar according to claim 1, characterized in that: The strip copper foil has equal width and thickness.

3. The high-toughness lithium battery module connecting copper bar according to claim 2, characterized in that: The strip copper foil has a width of 20-30 mm and a thickness of ≤0.1 mm.

4. The high-toughness lithium battery module connecting copper bar according to claim 1, characterized in that: The first copper bar (1), the second copper bar (2), the third copper bar (3), the fourth copper bar (4), the fifth copper bar (5) and the sixth copper bar (6) are integral copper foil stacking structures and are prepared by bending and shaping, and have rounded bends (10).

5. The high-toughness lithium battery module connecting copper bar according to claim 4, characterized in that: The radius of the bending fillet (10) is R5-R8 mm.

6. The high-toughness lithium battery module connecting copper bar according to claim 1, characterized in that: The width of the nickel sheet (7) is equal to the width of the strip copper foil.

7. The high-toughness lithium battery module connecting copper bar according to claim 6, characterized in that: The nickel sheet (7) has a thickness of 0.1-0.2 mm.

8. The high-toughness lithium battery module connecting copper bar according to claim 1, characterized in that: The connecting circular hole (8) is located at the center of the copper busbar and has a diameter of φ8-φ10 mm.

9. The high-toughness lithium battery module connecting copper bar according to claim 1, characterized in that: The protective tube (9) is a flame-retardant heat shrink tube with a thickness of 1 mm and a temperature resistance of 150°C. After instant heat shrinkage in a 250°C oven, it fits tightly onto the connecting copper busbar.

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