A back contact cell, cell assembly and photovoltaic system

Abstract

The utility model is suitable for photovoltaic technical field provides a kind of back contact cell, battery assembly and photovoltaic system;Back contact cell includes cell main body, and cell main body includes the front and back of opposite arrangement, and the back of cell main body is equipped with the grid line for being electrically connected with solder strip;And be equipped with the several insulating glue points of the front of cell main body, and the distance of at least two adjacent insulating glue points in parallel solder strip direction is less than the distance of at least two adjacent insulating glue points in non-parallel solder strip direction.The utility model provides back contact cell by setting up the several insulating glue points on the front of cell main body, and using insulating glue point can offset the force of solder strip to cell main body, and the warping deformation caused by solder strip to cell main body can be offset, to improve back contact cell production yield and precision.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a back contact battery, battery module and photovoltaic system. Background Technology

[0002] Solar cells, also known as photovoltaic cells, are devices that directly convert light energy into direct current (DC) using the photovoltaic effect. Solar cells are mainly divided into back-contact cells and bifacial contact cells. Back-contact cells, because both their positive and negative electrodes are located on the back of the cell, completely avoid the shading caused by metal grid lines on the front surface, eliminating optical losses and significantly improving conversion efficiency compared to bifacial contact cells. In related technologies, multiple back-contact cells are wired together and laminated to form a cell module.

[0003] In related technologies, when welding the back contact battery to the welding strip, since the welding strip is entirely located on the back side of the back contact battery, the thermal expansion and contraction effect generated by the heating during welding causes the welding strip to shrink, which can lead to warping and deformation of the battery cell, affecting the yield and precision of the battery cell. Utility Model Content

[0004] This invention provides a back-contact battery, which aims to solve the problem that warping and deformation easily occur during the welding of existing back-contact batteries, affecting the yield and precision of the battery cells.

[0005] This invention is implemented by providing a back contact battery, comprising:

[0006] A battery body, the battery body including a front side and a back side disposed opposite to each other, the back side of the battery body having grid lines for electrical connection with solder strips; and

[0007] A plurality of insulating adhesive dots are provided on the front side of the battery body, wherein the distance between at least two adjacent insulating adhesive dots in the direction parallel to the solder strip is less than the distance between at least two adjacent insulating adhesive dots in the direction not parallel to the solder strip.

[0008] Preferably, the distance between any two adjacent insulating adhesive dots in the direction parallel to the solder strip is less than the distance between any two adjacent insulating adhesive dots in the direction not parallel to the solder strip.

[0009] Preferably, the average distance between adjacent adhesive dots in the direction parallel to the solder strip is less than the average distance between adjacent adhesive dots in the direction not parallel to the solder strip.

[0010] Preferably, the ratio of the distance between any two adjacent insulating adhesive dots in the direction parallel to the solder strip to the distance between any two adjacent insulating adhesive dots in the direction not parallel to the solder strip is 1.5 to 2.5.

[0011] Preferably, the sum of the areas of all the isolation adhesive dots in the unit rectangular area parallel to the solder strip direction is greater than the sum of the areas of all the isolation adhesive dots in the unit rectangular area perpendicular to the solder strip direction, the width of the unit rectangular area is less than or equal to the size of a single isolation adhesive dot in the direction parallel to the solder strip, and the length of the unit rectangular area is greater than or equal to the distance between two adjacent isolation adhesive dots in the direction perpendicular to the solder strip direction.

[0012] Preferably, the number of release adhesive dots in a unit rectangular area parallel to the solder strip direction is greater than the number of release adhesive dots in a unit rectangular area not parallel to the solder strip direction, the width of the unit rectangular area is less than or equal to the size of a single release adhesive dot in the direction parallel to the solder strip, and the length of the unit rectangular area is greater than or equal to the distance between two adjacent release adhesive dots perpendicular to the solder strip direction.

[0013] Preferably, the battery body has an adsorption area at the center of the front side, and the isolation adhesive dots are disposed in the adsorption area.

[0014] Preferably, the ratio of the total area of ​​the isolation adhesive dots in the adsorption zone to the total area of ​​the adsorption zone is greater than 75%.

[0015] Preferably, the distance between two adjacent isolation adhesive dots in the adsorption zone parallel to the direction of the solder ribbon is greater than the distance between two adjacent isolation adhesive dots outside the adsorption zone parallel to the direction of the solder ribbon.

[0016] Preferably, the front side of the back contact battery is provided with an anti-friction area, the anti-friction area is provided with the insulating adhesive dots, the width of the anti-friction area is 15-30mm, and the distance between the anti-friction area and one end of the battery body is 10-30mm.

[0017] Preferably, the ratio of the total area of ​​the isolation adhesive dots in the anti-friction zone to the area of ​​the anti-friction zone is greater than 75%.

[0018] Preferably, the shape of the insulating adhesive dots is one or a combination of cylindrical, conical, pyramidal, prismatic, or strip-shaped.

[0019] Preferably, the height of the insulating adhesive dots is 5–30 μm.

[0020] Preferably, the distance between two adjacent adhesive dots parallel to the solder strip direction is 2-3 mm, and the distance between two adjacent adhesive dots not parallel to the solder strip direction is 3-5 mm.

[0021] Preferably, the total area of ​​the insulating adhesive dots accounts for 10% to 50% of the total area of ​​the front side.

[0022] This utility model also provides a battery assembly, including the aforementioned back contact battery.

[0023] This utility model also provides a photovoltaic system, including the above-mentioned battery components.

[0024] This utility model provides a back-contact battery by setting several insulating adhesive dots on the front side of the battery body. The insulating adhesive dots, after curing and shrinking, cause the battery body to bend forward. This forward bending stress from the curing and shrinking of the insulating adhesive dots cancels out the backward bending stress caused by the shrinkage of the solder strip after cooling. This offsets the forward bending deformation of the battery body caused by the curing and shrinking of the insulating adhesive dots and the backward bending deformation caused by the shrinkage of the solder strip after cooling, thereby improving the flatness of the battery body and ensuring the yield and precision of the back-contact battery. Furthermore, by controlling the distance between at least two adjacent insulating adhesive dots in the parallel solder strip direction to be smaller than that between at least two adjacent insulating adhesive dots in the non-parallel solder strip direction... The distance from the adhesive dots allows for a denser distribution of adhesive dots in at least a portion of the parallel solder ribbon direction compared to at least a portion of the non-parallel solder ribbon direction. This results in a greater warping force on the adhesive dots in the parallel solder ribbon direction compared to those in the non-parallel direction, enabling the adhesive dots to better counteract the force exerted by the solder ribbon on the battery body. This helps to better balance the warping deformation caused by the solder ribbon on the battery body, further improving the yield and precision of back-contact battery production. In addition, several adhesive dots can also increase the wear resistance of the front side of the battery body. By isolating and protecting the front side of the battery body with adhesive dots, damage to the front side of the battery cells can be prevented during subsequent processes and transportation. Attached Figure Description

[0025] Figure 1 A schematic diagram of the back-side connection of a back-contact battery to a solder strip provided in an embodiment of this utility model;

[0026] Figure 2 A front view of a back contact battery provided for an embodiment of this utility model;

[0027] Figure 3 A front view of the second type of back contact battery provided in this embodiment of the present utility model;

[0028] Figure 4 A front view of the third type of back contact battery provided in this embodiment of the utility model;

[0029] Figure 5 This is a front view of the fourth type of back contact battery provided in this embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "back", "front", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0034] Please refer to Figures 1-3 This utility model embodiment provides a back contact battery, comprising:

[0035] Battery body 1, comprising a front side 11 and a back side 12 disposed opposite to each other, the back side 12 of battery body 1 having grid lines (not shown) for electrical connection with solder strip 100; and

[0036] A plurality of insulating adhesive dots 2 are provided on the front side 11 of the battery body 1. The distance L1 between at least two adjacent insulating adhesive dots 2 in the direction Y parallel to the solder strip 100 is less than the distance L2 between at least two adjacent insulating adhesive dots 2 in the direction non-parallel to the solder strip 100.

[0037] In this embodiment of the invention, the front side 11 of the battery body 1 is the side facing sunlight when the back contact battery is in operation, and the back side 12 of the battery body 1 is the side facing away from sunlight when the back contact battery is in operation. The grid lines on the back side 12 of the battery body 1 can be fine grid lines or main grid lines. The back contact battery can be a back contact battery with main grid lines or a back contact battery without main grid lines. When the back contact battery is a back contact battery with main grid lines, the main grid lines connect to the fine grid lines on the back side 12 of the battery body 1, and the solder ribbon 100 is soldered to the main grid lines on the back contact battery to achieve electrical connection between the solder ribbon 100 and the grid lines on the back side 12 of the battery body 1. When the back contact battery is a back contact battery without main grid lines, the solder ribbon 100 is directly soldered to the fine grid lines on the back contact battery to achieve electrical connection between the solder ribbon 100 and the grid lines on the back side 12 of the battery body 1.

[0038] In this embodiment of the invention, a plurality of insulating adhesive dots 2 are disposed on the front surface 11 of the battery body 1. At least some of the insulating adhesive dots 2 are sequentially spaced along the parallel solder strip 100 direction Y, and at least some of the insulating adhesive dots 2 are sequentially spaced along the non-parallel solder strip 100 direction Y. The specific number of insulating adhesive dots 2 is not limited, and the plurality of insulating adhesive dots 2 can be arranged in multiple rows and columns on the front surface 11 of the battery body 1, or they can be arranged irregularly. Specifically, the insulating adhesive dots 2 can be equally spaced or unequally spaced in the parallel solder strip 100 direction, and equally spaced or unequally spaced in the non-parallel solder strip 100 direction.

[0039] In this embodiment of the invention, the line connecting the center points of adjacent release adhesive dots 2 in the direction Y parallel to the solder ribbon 100 is parallel to the solder ribbon 100, while the line connecting the center points of adjacent release adhesive dots 2 in the direction non-parallel to the solder ribbon 100 is not parallel to the solder ribbon 100. The direction of the non-parallel solder ribbon 100 can be perpendicular to the direction X of the solder ribbon 100, or it can be a direction that is not perpendicular to the direction X. For example, the direction of the non-parallel solder ribbon 100 can be a direction forming a 90° angle with the solder ribbon 100, i.e., perpendicular to the direction X; of course, the direction of the non-parallel solder ribbon 100 can also be a direction forming a 45° angle with the solder ribbon 100, or a direction forming a 60° angle with the solder ribbon 100. The distance L2 between two adjacent release adhesive dots 2 in the direction Y of the non-parallel solder ribbon 100 can be the distance between at least two adjacent release adhesive dots 2 in the direction perpendicular to the solder ribbon 100.

[0040] In this embodiment of the invention, the distance L1 between two adjacent release adhesive dots 2 can be either the distance between the edges of the two adjacent release adhesive dots 2 or the distance between the center points of the two adjacent release adhesive dots 2. Specifically, the distance L1 between two adjacent release adhesive dots 2 in the direction Y parallel to the solder ribbon 100, as shown in the accompanying drawings, is the distance between the edges of the two adjacent release adhesive dots 2 along the direction Y parallel to the solder ribbon 100; the distance between two adjacent release adhesive dots 2 in the direction X perpendicular to the solder ribbon 100, is the distance between the edges of the two adjacent release adhesive dots 2 along the direction X perpendicular to the solder ribbon 100.

[0041] The back-contact battery provided in this embodiment of the utility model has a plurality of insulating adhesive dots 2 set on the front side 11 of the battery body 1. After the insulating adhesive dots 2 cure and shrink, they cause the battery body 1 to bend towards the front side 11. The stress caused by the insulating adhesive dots 2 to bend towards the front side 11 after curing and shrinking is offset by the stress caused by the shrinkage of the solder ribbon 100 after cooling, which causes the battery body 1 to bend towards the back side 12. Thus, the bending deformation of the battery body 1 by the insulating adhesive dots 2 towards the front side 11 is offset by the bending deformation of the battery body 1 by the solder ribbon 100 towards the back side 12, thereby improving the flatness of the battery body 1 and ensuring the yield and precision of the back-contact battery. Furthermore, by controlling the distance L1 between at least two adjacent insulating adhesive dots 2 in the parallel solder ribbon 100 direction Y to be less than the distance L2 between at least two adjacent insulating adhesive dots 2 in the non-parallel solder ribbon 100 direction, the insulating adhesive dots 2 in at least a portion of the parallel solder ribbon 100 direction Y are more densely distributed than those in at least a portion of the non-parallel solder ribbon 100 direction. This results in a greater warping force on the insulating adhesive dots 2 in the parallel solder ribbon 100 direction Y of the battery body 1 compared to those in the non-parallel solder ribbon 100 direction. This counteracts the force exerted by the solder ribbon 100 on the battery body 1, which helps to balance the warping deformation caused by the solder ribbon 100 on the battery body 1, and further improves the production yield and precision of back contact batteries. In addition, several insulating adhesive dots 2 can also increase the wear resistance of the front side 11 of the battery body 1. By using the insulating adhesive dots 2 to isolate and protect the front side 11 of the battery body 1, damage to the front side 11 of the battery cells can be prevented during subsequent processes and transportation.

[0042] As an embodiment of this utility model, the material of the separating adhesive dots 2 can be one of PVB, EVA, EPE, EP, and POE, or a laminate of at least two of PVB, EVA, EPE, EP, and POE. Specifically, PVB is polyvinyl butyral, EVA is ethylene-vinyl acetate copolymer, POE is polyolefin elastomer, EPE is EVA-POE-EVA, and EP is EVA-POE. By setting the material of the separating adhesive dots 2 to the above-mentioned materials, the separating adhesive dots 2 can have good light transmittance, ensuring good power generation efficiency of the back contact battery, and also facilitating the connection between the separating adhesive dots 2 and the adhesive film of the battery module.

[0043] In this embodiment of the invention, the specific shape of the isolation adhesive dots 2 is not limited; the isolation adhesive dots 2 can be regular or irregular in shape. Furthermore, the shapes of each isolation adhesive dot 2 can be the same or different.

[0044] As an embodiment of this utility model, the shape of the isolation adhesive dot 2 is one or a combination of cylindrical, conical, pyramidal, prismatic or strip-shaped.

[0045] In this embodiment, the shape of the isolation adhesive dot 2 is one or a combination of cylindrical, conical, pyramidal, prismatic, or strip-shaped, which facilitates the processing and fabrication of the isolation adhesive dot 2. For example... Figure 2 As shown, the shape of the separating adhesive dot 2 is cylindrical; as Figure 3 As shown, the shape of the isolation adhesive dot 2 is long and narrow.

[0046] As one embodiment of this utility model, the height of the isolation adhesive dots 2 is 5-30 μm.

[0047] In this embodiment, the height of the insulating adhesive dots 2 is controlled to be 5–30 μm. This ensures that after the insulating adhesive dots 2 cure and shrink, they can bend the battery body 1 towards the front 11 to counteract the bending of the battery body 1 towards the back 12 caused by the shrinkage of the solder ribbon 100 after cooling. It also avoids the possibility of battery cell cracking during subsequent lamination due to excessively high heights of the insulating adhesive dots 2. The heights of the insulating adhesive dots 2 can be the same or different.

[0048] As an embodiment of this utility model, the distance L1 between any two adjacent isolation adhesive dots 2 in the Y direction of the parallel solder strip 100 is less than the distance L2 between any two adjacent isolation adhesive dots 2 in the non-parallel solder strip 100 direction.

[0049] In this embodiment, the distance between any two adjacent insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 is controlled to be less than the distance between any two adjacent insulating adhesive dots 2 in the non-parallel solder ribbon 100 direction. This makes the density of the insulating adhesive dots 2 in any region in the Y direction of the parallel solder ribbon 100 greater than the density of the insulating adhesive dots 2 in any region in the non-parallel solder ribbon 100 direction. As a result, the insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 can generate a greater warping force than the insulating adhesive dots 2 in the non-parallel solder ribbon 100 direction, so as to counteract the force exerted by the solder ribbon 100 on the battery body 1. This is beneficial to further balance the deformation caused by some of the solder ribbons 100 on the battery body 1, and to further improve the production yield and precision of the back contact battery.

[0050] As an embodiment of this utility model, the average distance between adjacent isolation adhesive dots 2 in the Y direction of the parallel solder strip 100 is less than the average distance between adjacent isolation adhesive dots 2 in the direction of the non-parallel solder strip 100.

[0051] In this embodiment, the average distance between adjacent release adhesive dots 2 in the parallel solder ribbon 100 direction Y is less than the average distance between adjacent release adhesive dots 2 in the non-parallel solder ribbon 100 direction. This can be understood as follows: when the same number of release adhesive dots 2 are in the parallel solder ribbon 100 direction Y and the non-parallel solder ribbon 100 direction, the average distance between adjacent release adhesive dots 2 in the parallel solder ribbon 100 direction Y is less than the average distance between adjacent release adhesive dots 2 in the non-parallel solder ribbon 100 direction.

[0052] For example, three adhesive dots 2 are taken in the Y direction parallel to the solder ribbon 100. These three adhesive dots 2 in the Y direction parallel to the solder ribbon 100 have two sets of distances between them, and the distance between each set of adhesive dots 2 is the distance between two adjacent adhesive dots 2. The distances between two adjacent sets of adhesive dots 2 are denoted as L11 and L12, respectively. The average distance between the two sets of adhesive dots 2 in the Y direction parallel to the solder ribbon 100 is the average of the sum of L11 and L12. Similarly, three adhesive dots 2 are taken in the X direction perpendicular to the solder ribbon 100. These three adhesive dots 2 in the Y direction perpendicular to the solder ribbon 100 have two sets of distances between them, respectively. The distances between the two sets of adhesive dots 2 are L21 and L22, respectively. The average distance between the two sets of adhesive dots 2 in the X direction perpendicular to the solder ribbon 100 is the average of the sum of L21 and L22.

[0053] For example, if five adhesive dots 2 are taken in the Y direction parallel to the solder ribbon 100, and there are four sets of distances between adjacent adhesive dots 2, with distances of L11, L12, L13, and L14 respectively, then the average of the distances between the four sets of adjacent adhesive dots 2 in the Y direction parallel to the solder ribbon 100 is the average of the sum of L11, L12, L13, and L14. If five adhesive dots 2 are taken in the X direction perpendicular to the solder ribbon 100, and there are four sets of distances between adjacent adhesive dots 2, with distances of L21, L22, L23, and L24 respectively, then the average of the distances between the four sets of adjacent adhesive dots 2 in the X direction perpendicular to the solder ribbon 100 is the average of the sum of L21, L22, L23, and L24.

[0054] In this embodiment, controlling the average distance between a preset number of adjacent insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 is less than the average distance between a preset number of adjacent insulating adhesive dots 2 in the direction of the non-parallel solder ribbon 100. This can further enhance the warping force generated by the insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100, which is beneficial to further balance the deformation caused by some solder ribbons 100 to the battery body 1, and further improve the production yield and precision of the back contact battery.

[0055] As an embodiment of this utility model, the ratio of the distance L1 between any two adjacent isolation adhesive dots 2 in the Y direction of the parallel solder strip 100 to the distance L2 between any two adjacent isolation adhesive dots 2 in the non-parallel solder strip 100 direction is 1.5 to 2.5.

[0056] In this embodiment, the distance between any two adjacent insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 can be the same or different; the distance between any two adjacent insulating adhesive dots 2 in the non-parallel solder ribbon 100 direction can also be the same or different. The ratio of the distance between any two adjacent insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 to the distance between any two adjacent insulating adhesive dots 2 in the non-parallel solder ribbon 100 direction is controlled to be 1.5 to 2.5, making the difference between the arrangement density of the insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 and the arrangement density of the insulating adhesive dots 2 in the non-parallel solder ribbon 100 direction more appropriate. This allows the insulating adhesive dots 2 to better counteract the force exerted by the solder ribbon 100 on the battery body 1, which is beneficial for balancing the deformation caused by the solder ribbon 100 on the battery body 1, and further improving the production yield and precision of the back contact battery. Preferably, the ratio of the distance between any two adjacent insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 to the distance between any two adjacent insulating adhesive dots 2 in the X direction perpendicular to the solder ribbon 100 is 1.5 to 2.5.

[0057] As an embodiment of this utility model, the distance L1 between two adjacent isolation adhesive dots 2 in the Y direction of the parallel solder strip 100 is 2-3 mm, and the distance L2 between two adjacent isolation adhesive dots 2 in the non-parallel solder strip 100 direction is 3-5 mm.

[0058] In this embodiment, the distance L1 between two adjacent insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 is controlled to be 2-3 mm, and the distance L2 between two adjacent insulating adhesive dots 2 in the non-parallel solder ribbon 100 direction is 3-5 m. This can avoid the distance between two adjacent insulating adhesive dots 2 in the Y direction of the parallel solder ribbon 100 or the non-parallel solder ribbon 100 direction being too large or too small. This ensures that the insulating adhesive dots 2 have good wear resistance and can effectively counteract the force of the solder ribbon 100 on the battery body 1, which is beneficial to balancing the deformation caused by the solder ribbon 100 on the battery body 1, thus taking into account both aspects.

[0059] As one embodiment of this utility model, the total area of ​​the isolation adhesive dots 2 accounts for 10% to 50% of the total area of ​​the front side 11.

[0060] In this embodiment, the total area of ​​the insulating adhesive dots 2 is the sum of the areas of all the insulating adhesive dots 2. Controlling the total area of ​​the insulating adhesive dots 2 to account for 10% to 50% of the total area of ​​the front side 11 can avoid the ratio of the total area of ​​the insulating adhesive dots 2 to the total area of ​​the front side 11 being too large or too small. This allows the insulating adhesive dots 2 to have better wear resistance and can better counteract the bending force of the solder ribbon 100 on the battery body 1 towards the back side 12, which is beneficial to balancing the deformation caused by the solder ribbon 100 on the battery body 1. In addition, it also reduces the impact of sunlight on the front side 11 of the back contact battery of the insulating adhesive dots 2.

[0061] In one embodiment of this utility model, the sum of the areas of all the release adhesive dots 2 in the unit rectangular area 101 in the direction Y parallel to the solder strip 100 is greater than the sum of the areas of all the release adhesive dots 2 in the unit rectangular area 101 in the direction X perpendicular to the solder strip 100. The width of the unit rectangular area 101 is less than or equal to the size of a single release adhesive dot 2 in the direction Y parallel to the solder strip 100, and the length of the unit rectangular area 101 is greater than or equal to the distance between two adjacent release adhesive dots 2 in the direction X perpendicular to the solder strip 100.

[0062] In this embodiment, the unit rectangular region 101 does not actually exist; it is merely used to compare the sum of the areas of all the insulating adhesive dots 2 within a unit area in the direction Y parallel to the solder ribbon 100 with the sum of the areas of all the insulating adhesive dots 2 within a unit area in the direction X perpendicular to the solder ribbon 100. By controlling the sum of the areas of all the insulating adhesive dots 2 within the unit rectangular region 101 in the direction Y parallel to the solder ribbon 100 to be greater than the sum of the areas of all the insulating adhesive dots 2 within the unit rectangular region 101 in the direction X perpendicular to the solder ribbon 100, the area of ​​the insulating adhesive dots 2 in the direction Y parallel to the solder ribbon 100 to be greater than the area of ​​the insulating adhesive dots 2 in the direction X perpendicular to the solder ribbon 100 can be further made to better counteract the force exerted by the solder ribbon 100 on the battery body 1, which is beneficial for balancing the deformation caused by the solder ribbon 100 on the battery body 1, and further improving the production yield and precision of the back contact battery.

[0063] As an embodiment of this utility model, the number of isolation adhesive dots 2 in the unit rectangular area 101 in the direction Y parallel to the solder ribbon 100 is greater than the number of isolation adhesive dots 2 in the unit rectangular area 101 in the direction non-parallel to the solder ribbon 100. The width of the unit rectangular area 101 is less than or equal to the size of a single isolation adhesive dot 2 in the direction Y parallel to the solder ribbon 100, and the length of the unit rectangular area 101 is greater than or equal to the distance between two adjacent isolation adhesive dots 2 in the direction X perpendicular to the solder ribbon 100.

[0064] In this embodiment, the number of isolation adhesive dots 2 in the unit rectangular area 101 in the direction Y of the parallel solder ribbon 100 is greater than the number of isolation adhesive dots 2 in the unit rectangular area in the direction of the non-parallel solder ribbon 100. This can also make the isolation adhesive dots 2 better offset the force of the solder ribbon 100 on the battery body 1, which is beneficial to balancing the deformation caused by the solder ribbon 100 on the battery body 1, and further improving the production yield and precision of the back contact battery.

[0065] Please refer to Figure 4 As an embodiment of the present invention, an adsorption area 111 is provided at the center of the front side 11 of the battery body 1, and an isolation adhesive dot 2 is provided in the adsorption area 111.

[0066] In this embodiment, the adsorption area 111 is used for the external suction cup to adsorb the battery body 1. The adsorption area 111 is provided with isolation adhesive dots 2. The suction cup contacts the isolation adhesive dots 2, which reduces the wear of the suction cup on the battery body 1 and improves the protection of the battery body 1.

[0067] As an embodiment of the present invention, the ratio of the total area of ​​the isolation adhesive dots 2 in the adsorption region 111 to the total area of ​​the adsorption region 111 is greater than 75%.

[0068] In this embodiment, the ratio of the total area of ​​the isolation adhesive dots 2 in the adsorption region 111 to the total area of ​​the adsorption region 111 is controlled to be greater than 75%, so that the suction cup can contact the isolation adhesive dots 2 in the adsorption region 111 as much as possible, thereby further reducing the wear of the suction cup on the battery body 1 and improving the protection capability of the battery body 1.

[0069] As an embodiment of the present invention, the distance between two adjacent isolation adhesive dots 2 in the Y direction parallel to the solder ribbon 100 inside the adsorption zone 111 is greater than the distance between two adjacent isolation adhesive dots 2 in the Y direction parallel to the solder ribbon 100 outside the adsorption zone 111.

[0070] In this embodiment, the distance between two adjacent insulating adhesive dots 2 in the direction Y parallel to the solder ribbon 100 within the adsorption zone 111 is greater than the distance between two adjacent insulating adhesive dots 2 in the direction Y parallel to the solder ribbon 100 outside the adsorption zone 111. As a result, the arrangement density of the insulating adhesive dots 2 in the adsorption zone 111 is greater than the arrangement density of the insulating adhesive dots 2 located outside the adsorption zone 111. When the suction cup adsorbs the insulating adhesive dots 2, the wear of the suction cup on the battery body 1 can be further reduced and the protection capability of the battery body 1 can be improved.

[0071] Please refer to Figure 5 As an embodiment of the present invention, the front side 11 of the back contact battery is provided with an anti-friction area 112, the anti-friction area 112 is provided with isolation adhesive dots 2, the width W1 of the anti-friction area 112 is 15-30mm, and the distance W2 between the anti-friction area 112 and one end of the battery body 1 is 10-30mm.

[0072] In this embodiment of the invention, the distance W2 between the anti-friction area 112 and one end of the battery body 1 is the distance between the anti-friction area 112 and the end of the anti-friction area 112 closest to the battery body 1. The front side 11 of the back-contact battery is provided with an anti-friction area 112, and some insulating adhesive dots 2 are disposed within the anti-friction area 112. The anti-friction area 112 is configured to contact the external conveyor belt when it comes into contact with the front side 11 of the battery body 1. Specifically, the insulating adhesive dots 2 located within the anti-friction area 112 contact the conveyor belt and are transported by the conveyor belt to various processing positions, preventing direct contact between the front side 11 of the battery body 1 and the conveyor belt, thus avoiding scratches to the battery body 1 and improving the integrity and production yield of the battery body 1.

[0073] As an embodiment of this utility model, the ratio of the total area of ​​the isolation adhesive dots 2 in the anti-friction area 112 to the area of ​​the anti-friction area 112 is greater than 75%.

[0074] In this embodiment, the ratio of the total area of ​​the isolation adhesive dots 2 located in the anti-friction zone 112 to the area of ​​the anti-friction zone 112 is greater than 75%, that is, the area of ​​the isolation adhesive dots 2 set in the anti-friction zone 112 is relatively large, which is beneficial to ensure that the anti-friction zone 112 has better anti-friction capability.

[0075] As an embodiment of this utility model, the isolation adhesive dots 2 in the anti-friction area 112 are strip-shaped, which helps to increase the anti-friction capability of the anti-friction area 112.

[0076] In some embodiments, the front side 11 of the battery body 1 includes a solder strip region opposite to the solder strip 100, wherein the distance between adjacent insulating adhesive dots 2 in the direction Y parallel to the solder strip 100 within the solder strip region is less than the distance between adjacent insulating adhesive dots 2 in the direction Y parallel to the solder strip 100 outside the solder strip region.

[0077] In this embodiment, the distance between adjacent insulating adhesive dots 2 in the direction Y parallel to the solder ribbon 100 within the solder ribbon area is less than the distance between adjacent insulating adhesive dots 2 in the direction Y parallel to the solder ribbon 100 outside the solder ribbon area. This makes the distribution density of insulating adhesive dots 2 in the solder ribbon area greater than that outside the solder ribbon area. This can increase the force exerted by the insulating adhesive dots 2 in the solder ribbon area on the battery body 1. The insulating adhesive dots 2 in the solder ribbon area can better offset the force exerted by the solder ribbon 100 on the battery body 1, which is beneficial for further balancing the deformation caused by the solder ribbon 100 on the battery body 1. This is beneficial for further improving the production yield and accuracy of back contact batteries. At the same time, it can reduce the number of insulating adhesive dots 2 set outside the solder ribbon area, which can reduce the production cost of the battery.

[0078] As an embodiment of this utility model, the height of the isolation adhesive dots 2 in the solder strip area is greater than the height of the isolation adhesive dots 2 outside the solder strip area.

[0079] In this embodiment, by increasing the height of the insulating adhesive dots 2 in the solder ribbon area, the stress generated by the insulating adhesive dots 2 in the solder ribbon area on the front side 11 of the battery body 1 can be increased, which is beneficial to further balance the deformation of the back side 12 of the battery body caused by the solder ribbon 100, and is beneficial to further improve the production yield and precision of the back contact battery.

[0080] This invention also provides a battery assembly including the back contact battery described in the above embodiments. It should be noted that this battery assembly has the same or similar beneficial effects as the back contact battery, and the related aspects between the two can be referred to each other; to avoid repetition, they will not be repeated here.

[0081] In this embodiment, multiple back-contact batteries in the battery assembly can be connected in series to form a battery string, thereby achieving series current output. For example, the battery cells can be connected in series by setting solder strips 100 (busbars, interconnecting strips), conductive backplates, etc.

[0082] It is understood that in such embodiments, the battery assembly may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film may be filled between the front and back of the back-contact battery, the photovoltaic glass, adjacent battery cells, etc. As a filler, it may be a transparent colloid with good light transmittance and aging resistance. For example, the encapsulating film may be an EVA film or a POE film, and the specific choice can be made according to the actual situation, without limitation.

[0083] Photovoltaic glass can be applied to the encapsulating film on the front side of the back contact battery. This photovoltaic glass can be ultra-clear glass, possessing high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 92%, protecting the back contact battery while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the back contact battery together, providing sealing, insulation, and waterproofing / moisture protection for the battery.

[0084] The backsheet can be attached to the adhesive film on the back of the back contact battery. The backsheet protects and supports the battery, providing reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, aluminum alloy TPT composite adhesive film, etc., and the specific choice depends on the specific circumstances and is not limited here. The backsheet, back contact battery, adhesive film, and photovoltaic glass can be mounted on a metal frame. The metal frame serves as the main external support structure for the entire back contact battery module, providing stable support and installation. For example, the back contact battery module can be installed at the desired location using the metal frame.

[0085] This invention also provides a photovoltaic system, which includes the battery module described in the above embodiments. It should be noted that this photovoltaic system has the same or similar beneficial effects as the back-contact battery described above, and the related aspects between the two can be referred to each other; to avoid repetition, they will not be repeated here.

[0086] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple back-contact battery modules. For example, multiple back-contact battery modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0087] In the description of this specification, references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0088] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A back-contact battery, characterized in that, include: A battery body, the battery body including a front side and a back side disposed opposite to each other, the back side of the battery body having grid lines for electrical connection with solder strips; and A plurality of insulating adhesive dots are provided on the front side of the battery body, wherein the distance between at least two adjacent insulating adhesive dots in the direction parallel to the solder strip is less than the distance between at least two adjacent insulating adhesive dots in the direction not parallel to the solder strip.

2. The back contact battery according to claim 1, characterized in that, The distance between any two adjacent release adhesive dots in the direction parallel to the solder strip is less than the distance between any two adjacent release adhesive dots in the direction not parallel to the solder strip.

3. The back contact battery according to claim 1, characterized in that, The average distance between adjacent release adhesive dots in the direction parallel to the solder strip is less than the average distance between adjacent release adhesive dots in the direction not parallel to the solder strip.

4. The back contact battery according to any one of claims 1 to 3, characterized in that, The ratio of the distance between any two adjacent insulating adhesive dots in the direction parallel to the solder strip to the distance between any two adjacent insulating adhesive dots in the direction not parallel to the solder strip is 1.5 to 2.

5.

5. The back contact battery according to claim 1, characterized in that, The sum of the areas of all the release adhesive dots in a unit rectangular region parallel to the solder strip direction is greater than the sum of the areas of all the release adhesive dots in a unit rectangular region perpendicular to the solder strip direction. The width of the unit rectangular region is less than or equal to the dimension of a single release adhesive dot in the direction parallel to the solder strip direction, and the length of the unit rectangular region is greater than or equal to the distance between two adjacent release adhesive dots in the direction perpendicular to the solder strip direction.

6. The back contact battery according to claim 1 or 5, characterized in that, The number of adhesive dots in a unit rectangular area parallel to the solder strip direction is greater than the number of adhesive dots in a unit rectangular area not parallel to the solder strip direction. The width of the unit rectangular area is less than or equal to the size of a single adhesive dot in the direction parallel to the solder strip, and the length of the unit rectangular area is greater than or equal to the distance between two adjacent adhesive dots perpendicular to the solder strip direction.

7. The back contact battery according to claim 1, characterized in that, An adsorption area is provided at the center of the front side of the battery body, and the isolation adhesive dots are provided in the adsorption area.

8. The back contact battery according to claim 7, characterized in that, The ratio of the total area of ​​the isolation adhesive dots in the adsorption zone to the total area of ​​the adsorption zone is greater than 75%.

9. The back contact battery according to claim 7 or 8, characterized in that, The distance between two adjacent adhesive dots in the adsorption zone, parallel to the direction of the solder ribbon, is greater than the distance between two adjacent adhesive dots outside the adsorption zone, parallel to the direction of the solder ribbon.

10. The back contact battery according to claim 1, characterized in that, The back contact battery has an anti-friction area on its front side, and the anti-friction area is provided with the insulating adhesive dots. The width of the anti-friction area is 15-30mm, and the distance between the anti-friction area and one end of the battery body is 10-30mm.

11. The back contact battery according to claim 10, characterized in that, The ratio of the total area of ​​the isolation adhesive dots within the anti-friction zone to the area of ​​the anti-friction zone is greater than 75%.

12. The back contact battery according to claim 1, characterized in that, The shape of the insulating adhesive dots is one or a combination of cylindrical, conical, pyramidal, prismatic, or strip-shaped.

13. The back contact battery according to claim 1, characterized in that, The height of the insulating adhesive dots is 5–30 μm.

14. The back contact battery according to claim 1, characterized in that, The distance between two adjacent adhesive dots parallel to the solder strip direction is 2-3 mm, and the distance between two adjacent adhesive dots not parallel to the solder strip direction is 3-5 mm.

15. The back contact battery according to claim 1, characterized in that, The total area of ​​the insulating adhesive dots accounts for 10% to 50% of the total area of ​​the front side.

16. A battery assembly, characterized in that, Includes the back contact battery as described in any one of claims 1 to 15.

17. A photovoltaic system, characterized in that, Includes the battery assembly as described in claim 16.

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