Anti-fracture structure for welding strip between battery pieces under high and low temperature circulation of light component

Abstract

The utility model relates to the technical field of photovoltaic modules, and discloses an inter-cell welding strip fracture prevention structure under high and low temperature circulation of a light module, which is arranged between two adjacent cells, two sides of each cell are respectively and correspondingly provided with at least one PAD point, and a plurality of fine grid lines on the cells are connected to the PAD points; a welding strip is connected between the positive electrode and the negative electrode of two adjacent battery pieces, and the welding strip passes through a PAD point; the portion, located between every two adjacent battery pieces, of the welding strip is bent to form a redundant section, and the redundant sections are used for generating deformation and energy absorption when the welding strip is stressed, so that when the assembly is subjected to high and low temperature circulation and the welding strip is stressed and deformed due to thermal expansion, the welding strip is pulled firstly to deform without directly acting on the section of the welding strip, and the welding strip is prevented from being damaged. Therefore, the welding strips between the battery pieces are prevented from being broken, and the service life of the light assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a structure for preventing welding strips between battery cells from being fractured under high and low temperature cycles of a lightweight component. Background Art

[0002] Lightweight components are encapsulated with polymer materials. Due to the large thermal expansion coefficient of polymer materials, the components are prone to expansion and deformation under high and low temperature cycle tests or long-term outdoor exposure. This can cause the soldering ribbons between the cells to break after multiple rounds of high and low temperature cycles, seriously affecting component performance. In view of the breakage of the soldering ribbons between the cells, structural improvements are required. Utility Model Content

[0003] The utility model aims to provide a structure for preventing the welding strips between battery cells from being fractured under high and low temperature cycles of a lightweight component, so as to solve the problems existing in the prior art.

[0004] To achieve the above-mentioned purpose, the utility model provides the following solution: the utility model provides a structure for preventing the welding strip from breaking between battery cells under high and low temperature cycles of a lightweight component, which is arranged between two adjacent battery cells, and at least one PAD point is arranged on both sides of the battery cell respectively, and a plurality of fine grid lines on the battery cell are connected to the PAD point; a welding strip is connected between the positive and negative electrodes of the two adjacent battery cells, and the welding strip passes through the PAD point; the welding strip is partially bent between the two adjacent battery cells to have a redundant section, and the redundant section is used to generate deformation and absorb energy when the welding strip is subjected to force.

[0005] Optionally, the redundant segment includes two bends.

[0006] Optionally, the redundant segment has a width of 0.5 mm to 2.0 mm, and a bending radius of R0.2 to R0.5.

[0007] Optionally, the distance between two adjacent battery cells is 1.4 mm.

[0008] Optionally, a portion of the welding strip located between two adjacent battery cells is sleeved with a reinforcing tube, and two ends of the reinforcing tube are respectively fixedly connected to the two battery cells.

[0009] Optionally, the reinforcement tube is made of glass fiber material.

[0010] Optionally, the inner hole diameter of the reinforcement tube is 1.2 mm.

[0011] Optionally, the welding ribbon is a round wire welding ribbon.

[0012] Optionally, the outer surface of the welding strip is coated with a bismuth coating.

[0013] The utility model discloses the following technical effects:

[0014] This solution sets a certain redundant section of the welding ribbon between the battery cells, and the length of the redundant section can be adjusted according to the specific situation. When the lightweight component is subjected to high and low temperature cycles, when the welding ribbon in the component is deformed due to thermal expansion, the welding ribbon is pulled to deform first, and the welding ribbon cross section itself is not directly affected, thereby preventing the welding ribbon from breaking due to the stretching of the welding ribbon, thereby improving the service life of the lightweight component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure of a photovoltaic module including the anti-fracture structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the anti-fracture structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the reinforcement pipe in the utility model;

[0019] Among them, 1. front panel; 2. back panel; 3. battery cell; 4. welding strip; 5. reinforcing tube; 6. adhesive film. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Reference Figure 1-Figure 3 The utility model provides a structure for preventing the welding strip between battery cells from being fractured under high and low temperature cycles of lightweight components, including:

[0023] Front panel 1 and back panel 2;

[0024] A plurality of battery cells 3, wherein the plurality of battery cells 3 are arranged between the front plate 1 and the back plate 2, and a welding strip 4 is welded between the positive and negative electrodes of two adjacent battery cells 3;

[0025] Among them, the welding strip 4 between two adjacent battery cells 3 is bent and provided with a redundant section, so that when the lightweight component undergoes high and low temperature cycles, when the welding strip 4 in the lightweight component is deformed by force due to thermal expansion, the welding strip 4 is pulled to deform first, and will not directly act on the cross section of the welding strip 4 itself.

[0026] After the lightweight component has been subjected to multiple cycles of high and low temperatures, the welding strip 4 is prone to breakage at the gap between the two battery cells 3. In this solution, a certain redundant section is set for the welding strip between the battery cells 3, and the length of the redundant section can be adjusted according to the specific situation. When the lightweight component is subjected to high and low temperature cycles, when the welding strip 4 in the component is deformed due to thermal expansion, the welding strip 4 is first pulled to deform, and the cross section of the welding strip 4 itself will not be directly acted on, thereby preventing the welding strip 4 from being broken due to the stretching of the welding strip 4. Figure 2 By using a forming tool, the welding strips 4 between the battery cells 3 are automatically bent to increase the redundant sections between the cells.

[0027] To further optimize the solution, the reinforcing tube 5 is sleeved outside the welding strip 4 between two adjacent battery cells 3 , and both ends of the reinforcing tube 5 are fixedly connected to the two battery cells 3 respectively.

[0028] In addition, this solution sets a reinforcing tube 5. After the welding strip 4 is bent, the equipment automatically adds a reinforcing tube 5 between the two PAD points. The reinforcing tube 5 mainly plays the role of local reinforcement of the welding strip 4 between the sheets. Under the high and low temperature cycle, the film 6 / front plate 1 / back plate 2 expands and contracts, and the cutting force only acts on the reinforcing tube 5, which protects the welding strip 4 in the reinforcing tube 5, and the welding strip 4 will not break. The reinforcing tube 5 is made of glass fiber material, and the material itself has a small thermal expansion coefficient. After the welding strip 4 is coated, the overall deformation of the welding strip 4 area due to the high and low temperature cycle is small, thereby ensuring that the welding strip 4 does not break.

[0029] According to a further optimized solution, the reinforcing tube 5 is located between two PAD points of two adjacent battery cells 3 .

[0030] According to a further optimized solution, the welding strip 4 is bent by a forming tool.

[0031] According to the further optimization scheme, the width of the redundant section of the welding ribbon 4 is 1 mm; the bending radius of the welding ribbon 4 is R0.2; the distance between two adjacent battery cells 3 is 1.4 mm; the string distance is 2.0 mm; and the inner hole diameter of the reinforcing tube 5 is 1.2 mm.

[0032] According to a further optimized solution, an adhesive film 6 is provided between the front plate 1 and the plurality of battery cells 3 and between the back plate 2 and the plurality of battery cells 3 .

[0033] The photovoltaic module mentioned in the utility model refers to: due to the low output voltage of a single solar cell, and the electrodes of an unpackaged cell are easily detached due to environmental influences, a certain number of single cells must be sealed in series and parallel to form a solar cell module to prevent the cell electrodes and interconnecting wires from being corroded. In addition, packaging also prevents the cell from breaking and facilitates outdoor installation. The quality of packaging determines the service life and reliability of the solar cell module.

[0034] High and low temperature cycling refers to placing the component in a cycle of component temperature from (-40±2)℃ to (+85±2)℃ to determine the component's ability to withstand thermal mismatch, fatigue and other stresses caused by repeated temperature changes. The rate of temperature change between high and low temperatures should not exceed 100℃ / h, and each temperature extreme should be maintained for at least 10 minutes. A cycle should not exceed 6 hours

[0035] Photovoltaic welding ribbon, also known as tinned copper ribbon or tin-coated copper ribbon, is divided into busbars and interconnection strips. It is used to connect the cells of photovoltaic modules and plays an important role in conducting electricity.

[0036] The front plate 1 can adopt CPC structure, and the adhesive film 6 can adopt EVA, EPE, PVB, etc.;

[0037] The welding strip 4 can be a round wire welding strip, or a welding strip 4 with a low-temperature coating (metal bismuth) can be used;

[0038] In some specific embodiments, the width of the redundant segment is not limited to 1 mm, but may be 0.5 mm, 0.6 mm, 0.8 mm, 2.0 mm, etc.; the bending radius is not limited to R0.2, but may be R0.1, R0.2, R0.3, R0.4, R0.5, etc.

[0039] The directions or positional relationships indicated by “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0040] The above embodiments are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A structure for preventing the welding strip from breaking between cells of a lightweight component under high and low temperature cycles, arranged between two adjacent cells (3), characterized in that: At least one PAD point is correspondingly arranged on both sides of the battery cell (3), and a plurality of fine grid lines on the battery cell (3) are all connected to the PAD point; a welding strip (4) is connected between the positive electrode and the negative electrode of two adjacent battery cells (3), and the welding strip (4) passes through the PAD point; a portion of the welding strip (4) located between the two adjacent battery cells (3) is bent to have a redundant section, and the redundant section is used to generate deformation and absorb energy when the welding strip (4) is subjected to force.

2. According to claim 1, a structure for preventing the welding strip between battery cells from being fractured under high and low temperature cycles of a lightweight component, characterized in that: The redundant section includes two bends.

3. The anti-fracture structure of the welding strip between battery cells of a lightweight component under high and low temperature cycles according to claim 2 is characterized in that: The redundant section has a width of 0.5 mm to 2.0 mm, and a bending radius of R0.2 to R0.

5.

4. The anti-fracture structure of the welding strip between battery cells of a lightweight component under high and low temperature cycles according to claim 3 is characterized in that: The distance between two adjacent battery cells (3) is 1.4 mm.

5. The anti-fracture structure of the welding strip between battery cells of a lightweight component under high and low temperature cycles according to claim 1 is characterized in that: A reinforcing tube (5) is sleeved on the portion of the welding strip (4) located between two adjacent battery cells (3), and two ends of the reinforcing tube (5) are respectively fixedly connected to the two battery cells (3).

6. The anti-fracture structure of the welding strip between battery cells of a lightweight component under high and low temperature cycles according to claim 5, characterized in that: The reinforcing tube (5) is made of glass fiber material.

7. The anti-fracture structure of the welding strip between battery cells of a lightweight component under high and low temperature cycles according to claim 5, characterized in that: The inner hole diameter of the reinforcing tube (5) is 1.2 mm.

8. The anti-fracture structure of the welding strip between battery cells of a lightweight component under high and low temperature cycles according to claim 1 is characterized in that: The welding strip (4) is a round wire welding strip.

9. The anti-fracture structure of the welding strip between battery cells of a lightweight component under high and low temperature cycles according to claim 8, characterized in that: The outer surface of the welding strip (4) is coated with a bismuth coating.

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