Lithium battery module anode connecting soft copper bar

Abstract

The utility model belongs to the technical field of copper bars for lithium battery modules, and discloses a lithium battery module positive electrode connection soft copper bar, which comprises a first soft copper bar, the first soft copper bar is vertically connected with a second soft copper bar, the second soft copper bar is vertically connected with a third soft copper bar, the third soft copper bar is vertically bent and connected with a fourth soft copper bar, and the fourth soft copper bar is vertically bent and connected with a third soft copper bar. The fourth soft copper bar is bent to be connected with a fifth soft copper bar, and the fifth soft copper bar is bent upwards to be connected with a sixth soft copper bar; the top surfaces of the first copper bar and the sixth copper bar are provided with thin 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 soft copper bar, the third soft copper bar, the fourth soft copper bar and the fifth soft copper bar are wrapped with protection tubes, and the protection tube of the third soft copper bar is provided with a product code and a material code. The lithium battery module has the characteristics of compact structure, good toughness, stable and reliable connection, long service life and the like, and can be widely applied to the technical field of lithium battery module connection 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 soft copper bar for connecting the positive electrode of a lithium battery module. Background Art

[0002] In recent years, with the rapid development of industrial economy and logistics industry, industrial handling vehicles have been widely used in all walks of life. In addition, with the rapid development of new energy industry, new energy industrial vehicles such as hybrid power and pure electric power have made great progress. 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 storage energy density, low self-discharge rate, strong adaptability to high and low temperatures, 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 copper busbars are mainly hard copper busbars and laminated soft copper busbars. The hard copper busbars 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 positive electrode connection soft copper busbars lack protection at the turning point, so they are prone to creases or even breakage during long-term use, which poses a safety hazard to the use of lithium batteries. Therefore, the existing lithium battery module positive electrode connection soft copper busbar structure 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 soft copper busbar for connecting the positive electrode of a lithium battery module, which has the characteristics of compact structure, good toughness, stable and reliable connection and long service life, and can be widely used in the technical field of lithium battery module connection of industrial vehicles.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a lithium battery module positive electrode connecting soft copper bar, including a first soft copper bar, the first soft copper bar is vertically connected to the second soft copper bar, the second soft copper bar is vertically connected to the third soft copper bar, the third soft copper bar is vertically bent and connected to the fourth soft copper bar, the fourth soft copper bar is bent and connected to the fifth soft copper bar, and the fifth soft copper bar is bent upward and connected to the sixth soft copper bar; the top surfaces of the first soft copper bar and the sixth soft copper bar are provided with a thin nickel sheet, and a penetrating connecting circular hole is provided on the head; the surfaces of the second soft copper bar, the third soft copper bar, the fourth soft copper bar and the fifth soft copper bar are wrapped with a protective tube, and the protective tube of the third soft copper bar is provided with a product code and a material code.

[0006] As an improvement, the first soft copper bar, the second soft copper bar, the third soft copper bar, the fourth soft copper bar, the fifth soft copper bar and the sixth soft copper bar are formed by stacking long strips of sub-copper foils with equal width and thickness, and are prepared by bending and shaping.

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

[0008] As an improvement, the thickness of the soft copper busbar after the long strip copper foils are stacked is 4-6 mm.

[0009] As an improvement, the bending angles of the fourth soft copper busbar and the fifth soft copper busbar are 40°-75°, and rounded corners are provided at the bending positions.

[0010] As an improvement, the rounded corner size is R10~R20mm.

[0011] As an improvement, the fifth soft copper busbar and the sixth soft copper busbar are provided with a bending angle, and the bending angle is 110° to 135°.

[0012] As an improvement, the width of the thin nickel sheet is equal to the width of the long strip copper foil, and is formed by instantaneous pressing at high temperature.

[0013] As an improvement, the thickness of the thin nickel sheet is 0.1-0.2 mm.

[0014] As an improvement, the connecting circular hole is located at the center of the copper busbar and has a diameter of φ8~φ10mm.

[0015] 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.

[0016] The beneficial effects of the utility model are as follows: a soft copper busbar for connecting the positive electrode of a lithium battery module has the characteristics of compact structure, good toughness, stable and reliable connection and long service life. The soft copper busbar is prepared by mechanically folding a long strip of tung oil foil with a thickness of less than 0.1 mm, which effectively improves the connection toughness of the soft copper busbar and avoids bending damage caused by a hard connection structure; a 1 mm thin heat shrink tube is used as a protective tube, so that the heat shrinkage is more tightly adhered after heat shrinkage, avoiding the movement and displacement of the heat shrink tube, and at the same time, a product code and a material code are set on the protective tube to improve recognition and facilitate later replacement; in addition, a thin nickel sheet is set on the head of the soft copper busbar, so the strength of the copper busbar is improved when the positive electrode is connected, making the connection more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the soft copper busbar connected to the positive electrode of the lithium battery module of the utility model;

[0018] Figure 2 This is a front view of the soft copper busbar for connecting the positive electrode of the lithium battery module of the utility model;

[0019] Figure 3 It is a cross-sectional view of a soft copper busbar connected to the positive electrode of a lithium battery module of the present invention.

[0020] In the figure: 1. First soft copper bar; 2. Second soft copper bar; 3. Third soft copper bar; 4. Fourth soft copper bar; 5. Fifth soft copper bar; 6. Sixth soft copper bar; 7. Nickel sheet; 8. Connecting round hole; 9. Protective tube; 10. Product code and material code; 11. Chamfered corner; 12. Bending corner. DETAILED DESCRIPTION

[0021] Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0022] like Figure 1-3 As shown, a lithium battery module positive electrode connecting soft copper bar of the present embodiment includes a first soft copper bar 1, the first soft copper bar 1 is vertically connected to the second soft copper bar 2, the second soft copper bar 2 is vertically connected to the third soft copper bar 3, the third soft copper bar 3 is vertically bent and connected to the fourth soft copper bar 4, the fourth soft copper bar 4 is bent and connected to the fifth soft copper bar 5, and the fifth soft copper bar 5 is bent upward and connected to the sixth soft copper bar 6; a thin 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 second soft copper bar 2, the third soft copper bar 3, the fourth soft copper bar 4 and the fifth soft copper bar 5 are wrapped with a protective tube 9, and the protective tube of the third soft copper bar 3 is provided with a product code and a material code 10.

[0023] Furthermore, the first soft copper busbar 1, the second soft copper busbar 2, the third soft copper busbar 3, the fourth soft copper busbar 4, the fifth soft copper busbar 5 and the sixth soft copper busbar 6 are formed by stacking long strips of sub-copper foils with equal width and thickness, and are prepared by bending and shaping, so as to ensure that the appearance of the soft copper busbar is more regular and the bending and shaping firmness is higher; specifically, the width of the long strip of sub-copper foil is 20-30 mm, and the thickness is ≤0.1 mm. The thinner sub-copper foil can make the soft copper busbar more tough and convenient for turning and connection; further, the thickness of the soft copper busbar after the long strip of sub-copper foil is stacked is 4-6 mm, preferably 5-5.5 mm, which ensures the connection strength while reducing the material cost of the soft copper busbar.

[0024] Furthermore, the bending angles of the fourth soft copper busbar 4 and the fifth soft copper busbar 5 are 40°~75°, preferably 50°~60°, and a chamfer 11 is provided at the bending position; specifically, the size of the chamfer 11 is R10~R20mm. The chamfer 11 makes the transition effect of the soft copper busbar after bending better, avoiding creases caused by bending and affecting the service life.

[0025] Furthermore, the fifth soft copper busbar 5 and the sixth soft copper busbar 6 are provided with a bending angle 12, and the bending angle 12 is 110°-135°, preferably 120°; the bending angle 12 facilitates the change of direction of the soft copper busbar.

[0026] Furthermore, the width of the thin nickel sheet 7 is equal to that of the long strip copper foil, and is formed by high-temperature instantaneous pressing; specifically, the width of the thin 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.

[0027] 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.

[0028] 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.

[0029] 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 lithium battery module positive electrode connection soft copper bar, characterized in that: The invention comprises a first soft copper bar (1), wherein the first soft copper bar (1) is vertically connected to a second soft copper bar (2), the second soft copper bar (2) is vertically connected to a third soft copper bar (3), the third soft copper bar (3) is vertically bent to connect to a fourth soft copper bar (4), the fourth soft copper bar (4) is bent to connect to a fifth soft copper bar (5), and the fifth soft copper bar (5) is bent upward to connect to a sixth soft copper bar (6); a thin nickel sheet (7) is provided on the top surface of the first soft copper bar (1) and the sixth soft copper bar (6), and a connecting circular hole (8) is provided through the head; the surfaces of the second soft copper bar (2), the third soft copper bar (3), the fourth soft copper bar (4) and the fifth soft copper bar (5) are wrapped with a protective tube (9), and the protective tube of the third soft copper bar (3) is provided with a product code and a material code (10).

2. The lithium battery module positive electrode connection soft copper busbar according to claim 1, characterized in that: The first soft copper bar (1), the second soft copper bar (2), the third soft copper bar (3), the fourth soft copper bar (4), the fifth soft copper bar (5) and the sixth soft copper bar (6) are formed by stacking long strips of copper foil having equal width and thickness and are prepared by bending and shaping.

3. The lithium battery module positive electrode connection soft copper bar according to claim 2, characterized in that: The width of the long strip copper foil is 20-30 mm, and the thickness is ≤0.1 mm.

4. The lithium battery module positive electrode connection soft copper busbar according to claim 3, characterized in that: The thickness of the soft copper busbar after the long strip copper foils are stacked is 4-6 mm.

5. The lithium battery module positive electrode connection soft copper busbar according to claim 1, characterized in that: The bending angles of the fourth soft copper busbar (4) and the fifth soft copper busbar (5) are 40° to 75°, and a rounded corner (11) is provided at the bending position, and the size of the rounded corner (11) is R10 to R20 mm.

6. The lithium battery module positive electrode connection soft copper busbar according to claim 1, characterized in that: The fifth soft copper busbar (5) and the sixth soft copper busbar (6) are provided with a bending angle (12), and the bending angle (12) is in the range of 110° to 135°.

7. The lithium battery module positive electrode connection soft copper busbar according to claim 2, characterized in that: The thin nickel sheet (7) has a width equal to that of the long strip copper foil and is formed by instantaneous pressing at high temperature.

8. The lithium battery module positive electrode connection soft copper busbar according to claim 7, characterized in that: The thickness of the nickel sheet is 0.1-0.2 mm.

9. The lithium battery module positive electrode connection soft copper busbar 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.

10. The lithium battery module positive electrode connection soft 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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