Battery assembly without main grid

Abstract

The utility model discloses a main-grid-free battery assembly, which comprises a battery piece, a wire grid layer, a supporting layer and a bus bar, the wire grid layer is arranged on the battery piece, the supporting layer is arranged at the bottom of the wire grid layer, the wire grid layer comprises a plurality of first grooves which are equidistantly arranged along a first horizontal direction, and the first grooves are arranged on the battery piece along a second horizontal direction in an extending manner; the supporting layer comprises an adhesion layer, a buffer layer and a wear-resistant layer which are sequentially arranged from top to bottom, a plurality of second grooves are formed in the adhesion layer and penetrate through the adhesion layer, and the second grooves are configured to be provided with bus bars; and a third groove corresponding to the first groove is formed in the adhesion layer. According to the main-grid-free battery assembly, through cooperation of the battery pieces, the wire grid layer, the supporting layer and the bus bars, the reliability and stability of connection of the main-grid-free battery pieces are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic cell technical field especially relates to a kind of main grid-free battery components. BACKGROUND

[0002] In the field of photovoltaic cells, compared with conventional SMBB, 0BB can reduce about 30% silver paste, paving the way for the application of 30% silver content silver-coated copper paste, and pure silver paste+0BB can reduce the cost by more than 0.08 yuan / W, silver-coated copper+0BB can reduce the cost by 0.04-0.05 yuan / W. In addition, the 0BB process uses ultra-fine and ultra-soft welding tape, which can save more than 10% of the welding tape. After the welding tape becomes thinner, the adhesive film will become thinner, and ultimately 30% of the adhesive film can be saved. However, with the development of main grid-free battery pieces, the reliability of the connection between the grid lines and the bus bar becomes a key problem.

[0003] The traditional connection structure is simple, mostly assisted by single-layer insulation material, relies on the welding quality, lacks fine positioning and effective protection of the connection components, and is prone to problems such as welding tape displacement and false welding, which leads to unstable battery performance and shortened service life, making it difficult to meet the demand for efficient and stable power generation. Therefore, innovative connection structure technology is needed to improve the reliability and stability of main grid-free battery piece connection and promote the development of the photovoltaic industry. SUMMARY

[0004] To solve the problems of the related art, the utility model aims to provide a main grid-free battery component to solve the above problems.

[0005] To achieve the above-mentioned purpose, the utility model embodiment adopts the following technical solutions:

[0006] A main grid-free battery component includes a battery piece, a wire grid layer, a support layer, and a bus bar. The wire grid layer is provided on the battery piece, and the support layer is provided at the bottom of the wire grid layer. The wire grid layer includes a plurality of first grooves provided equidistantly along a first horizontal direction, and the first grooves are provided on the battery piece along a second horizontal direction. The first grooves are configured to install grid lines, and the grid lines protrude from the first grooves. The support layer includes a bonding layer, a buffer layer, and a wear-resistant layer provided in sequence from top to bottom. A plurality of second grooves are provided equidistantly along the second horizontal direction on the bonding layer, and the second grooves penetrate the bonding layer along the first horizontal direction. The second grooves are each provided with a butt joint portion, and the second grooves are configured to install the bus bar. A third groove is provided on the bonding layer corresponding to the first groove, and the third groove is configured to accommodate a protruding portion of the grid line protruding from the first groove. The protruding portion is in abutting arrangement with the bus bar in the second groove. The first horizontal direction and the second horizontal direction are arranged vertically.

[0007] Optionally, the second groove is a semicircular groove.

[0008] Optionally, the butt joint portion is umbrella-shaped, and the opening angle is 60°.

[0009] Optionally, the bottom of the second groove is provided with an abrasive surface, and the roughness of the abrasive surface is 0.1-0.3 μm.

[0010] Optionally, the depth of the second groove is 1.2-1.3 times the thickness of the bus bar.

[0011] Optionally, the thickness of the adhesion layer is set to 30-50 μm, the thickness of the buffer layer is set to 100-200 μm, and the thickness of the wear-resistant layer is set to 50-100 μm.

[0012] Optionally, the adhesion layer is made of PVDF, the buffer layer is made of rubber modified epoxy resin composite material, and the wear-resistant layer is made of acrylate polymer.

[0013] The utility model discloses the beneficial effect is through the cooperation of battery piece, wire lattice layer, support layer and bus bar, has improved the reliability and stability of main grid-free battery piece connection, through setting up the second groove to be semicircular, the installation of bus bar is convenient, has improved installation efficiency, through the bottom of second groove is provided with abrasive surface, has improved the stability of bus bar installation. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate and understand the technical scheme in the embodiment of the utility model, the following will be to the utility model background art, the embodiment of the utility model needed to use the drawing briefly introduced, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to the content of the embodiment of the utility model and these drawings.

[0015] Fig. 1 It is the side view of a main grid-free battery assembly provided by the embodiment of the utility model,

[0016] Fig. 2 It is the structure schematic view of a main grid-free battery assembly provided by the embodiment of the utility model,

[0017] Fig. 3 It is the top view of the battery piece of a main grid-free battery assembly provided by the embodiment of the utility model,

[0018] Fig. 4 It is the top view of the support layer of a main grid-free battery assembly provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0019] The utility model will be described further in detail below with reference to the drawings.

[0020] In order to facilitate understanding the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive. It should be noted that when a component is referred to as "fixed to" another component, it can be directly on another component or there can be a middle component. When a component is considered "connected" to another component, it can be directly connected to another component or there can be a middle component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as understood by those skilled in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0021] Please refer to Figs. 1 to 4 As shown in the drawings, the embodiment provides a kind of main grid-free battery pack, it includes cell sheet 10, wire grid layer 20, support layer 30 and bus bar 40, wire grid layer 20 is opened in cell sheet 10, support layer 30 is arranged in the bottom of wire grid layer 20, wire grid layer 20 includes multiple first recess 21 being equidistantly opened along first horizontal direction, first recess 21 is arranged on cell sheet 10 along second horizontal direction, first recess 21 is configured to install grid line 50, grid line 50 is arranged in first recess 21, support layer 30 includes adhesion layer 31, buffer layer 32 and wear-resistant layer 33 sequentially arranged from top to bottom, multiple second recess 310 are equidistantly opened on adhesion layer 31 along second horizontal direction, second recess 310 is arranged through adhesion layer 31 along first horizontal direction, second recess 310 is all provided with docking portion, second recess 310 is configured to install bus bar 40, third recess 311 is provided on adhesion layer 31 corresponding to first recess 21, third recess 311 is configured to accommodate the protruding portion of grid line 50 protruding from first recess 21, protruding portion is arranged in abutment with bus bar 40 in second recess 310, first horizontal direction and second horizontal direction are arranged perpendicularly.

[0022] It can be seen that the wire grid layer 20 cooperates with the support layer 30. On the one hand, the first groove 21 of the wire grid layer 20 provides a precise placement path for the grid line 50, ensuring that the grid line 50 is regularly arranged and improving the uniformity of current collection. On the other hand, the three-layer structure of the support layer 30 has clear division of labor. The adhesion layer 31 assists in fixing the grid line 50, the buffer layer 32 resists external force impact, and the wear-resistant layer 33 protects against external erosion, thereby comprehensively ensuring the stable operation of the battery piece 10 and the connecting structure and improving the overall reliability and stability of the battery assembly.

[0023] As an embodiment, the second groove 310 is a semicircular groove.

[0024] It can be seen that the second groove 310 is designed as a semicircular groove, which conforms to the shape of the busbar 40 and is smoother during placement, reducing scratching damage. At the same time, it can better wrap the components in the second groove 310 with conductive glue, increase the contact area, optimize the electrical connection effect, and further improve the current transmission efficiency.

[0025] As an embodiment, the abutment portion is umbrella-shaped, and the opening angle is 60°.

[0026] It can be seen that the abutment portion is umbrella-shaped and the opening angle is 60°. When filling the conductive glue, it can act like a guide funnel, allowing the conductive glue to flow quickly and accurately into the bottom of the second groove 310 and fully contact the busbar 40, avoiding the accumulation or uneven distribution of conductive glue at the entrance of the second groove 310, ensuring the compactness of the connection, effectively reducing the risk of false welding, and improving the connection quality.

[0027] As an embodiment, the bottom of the second groove 310 is provided with an abrasive surface, and the roughness of the abrasive surface is 0.1-0.3 μm.

[0028] It can be seen that the rough surface greatly increases the friction and attachment area of the conductive glue with the bottom of the second groove 310. When using conductive glue, the abrasive surface can prevent the conductive glue from sliding due to gravity or vibration before solidification, ensuring that the conductive glue adheres uniformly and firmly in the groove, thereby stabilizing the connection of the grid line 50 and the busbar 40 and ensuring stable current transmission.

[0029] As an embodiment, the depth of the second groove 310 is 1.2-1.3 times the thickness of the busbar 40.

[0030] It can be seen that the depth of the second groove 310 is 1.2-1.3 times the thickness of the busbar 40. This depth design allows the busbar 40 to be placed in the second groove 310, providing sufficient wrapping and support without being too deep to affect the cooperation with the grid line 50. When subjected to external force impact, the depth of the second groove 310 can buffer part of the pressure, protecting the connection between the busbar 40 and the grid line 50 and maintaining the structural stability of the battery assembly.

[0031] As an implementation form, the thickness of the adhesion layer 31 is set to 30-50 μm, the thickness of the buffer layer 32 is set to 100-200 μm, and the thickness of the wear-resistant layer 33 is set to 50-100 μm.

[0032] Preferably, the thickness of the adhesion layer 31 is set to 30 μm, the thickness of the buffer layer 32 is set to 125 μm, and the thickness of the wear-resistant layer 33 is set to 80 μm.

[0033] It can be seen that the thickness of the adhesion layer 31 is set to 30-50 μm, which can ensure its strong adhesion function to tightly fix the grid lines 50, bus bars 40 and other components on the battery piece 10, and will not affect the current transmission or increase the weight of the assembly due to excessive thickness; the thickness of the buffer layer 32 is 100-200 μm, which can be flexibly adjusted according to the demand of different application scenarios for the buffering performance, and effectively cope with various external force impact; the thickness of the wear-resistant layer 33 is 50-100 μm, which can provide sufficient weather resistance and wear resistance protection while maintaining the light and thin characteristics of the assembly as a whole.

[0034] As an implementation form, the adhesion layer 31 is made of PVDF, the buffer layer 32 is made of rubber modified epoxy resin composite material, and the wear-resistant layer 33 is made of acrylate polymer.

[0035] It can be seen that the adhesion layer 31 is made of PVDF, which utilizes the good adhesion, chemical stability and weather resistance of PVDF to ensure that the battery piece 10 and the support layer 30 are firmly bonded and can resist external chemical corrosion, and long-term stable maintenance of the assembly structure; the buffer layer 32 is made of rubber modified epoxy resin composite material, which utilizes its excellent buffering and energy absorption characteristics to absorb and disperse external force and protect the free grid battery assembly; the wear-resistant layer 33 is made of acrylate polymer, which utilizes its high wear resistance and weather resistance to directly resist the harsh external environment and prolong the service life of the free grid battery assembly.

[0036] In the embodiments disclosed in the present application, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense. For example, "connection" can be fixed connection, or detachable connection, or integrally connected; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments disclosed in the present application can be understood according to the specific circumstances.

[0037] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited by the above examples. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A no-lead cell assembly, characterized by, The mainless grid battery assembly comprises a battery piece, a wire grid layer, a support layer and a bus bar, wherein: the wire grid layer is opened on the battery piece, the support layer is arranged at the bottom of the wire grid layer, the wire grid layer comprises a plurality of first grooves equidistantly opened along a first horizontal direction, the first grooves are arranged on the battery piece along a second horizontal direction, the first grooves are configured to install grid lines, the grid lines protrude from the first grooves, the support layer comprises a bonding layer, a buffer layer and a wear-resistant layer arranged in sequence from top to bottom, a plurality of second grooves equidistantly opened along the second horizontal direction are arranged on the bonding layer, the second grooves are arranged through the bonding layer along the first horizontal direction, the second grooves are all provided with butt joint parts, the second grooves are configured to install the bus bar, the bonding layer is provided with third grooves corresponding to the first grooves, the third grooves are configured to accommodate protruding parts of the grid lines protruding from the first grooves, the protruding parts are arranged in abutment with the bus bar in the second grooves, and the first horizontal direction and the second horizontal direction are arranged vertically.

2. A solar cell module according to claim 1, wherein The second grooves are semicircular grooves.

3. A solar cell module according to claim 1, wherein The butt joint parts are umbrella-shaped, and the opening angle is 60°.

4. A solar cell module according to claim 1, wherein The bottom of the second groove is provided with a frosted surface, and the roughness of the frosted surface is 0.1-0.3 μm.

5. A solar cell module according to claim 1, wherein The depth of the second groove is 1.2-1.3 times the thickness of the bus bar.

6. A solar cell module according to claim 1, wherein The thickness of the bonding layer is 30-50 μm, the thickness of the buffer layer is 100-200 μm, and the thickness of the wear-resistant layer is 50-100 μm.

7. A solar cell module according to claim 1, wherein The bonding layer is made of PVDF, the buffer layer is made of rubber modified epoxy resin composite material, and the wear-resistant layer is made of acrylic ester polymer.

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