Battery without solder strip connection and assembly

Abstract

The utility model discloses a battery without solder strip connection, which comprises battery main bodies, an upper screen printing plate layer and a lower screen printing plate layer are arranged on the battery main bodies, and two adjacent battery main bodies are connected through the upper screen printing plate layer and the lower screen printing plate layer. The utility model provides a battery without solder strip connection, the battery without solder strip connection and an assembly comprise battery main bodies, an upper screen layer and a lower screen layer are configured on the battery main bodies, and two adjacent battery main bodies are connected through the upper screen layer and the lower screen layer. Wherein the copper wire screen printing plate layer is laid on the battery main body in an electroplating or high-temperature sintering mode. Through the design of the structure, the stress is reduced when the batteries are connected, and the subfissure rate is greatly reduced, so that the thin-sheet design of the batteries is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic cells, and more specifically, the utility model relates to a battery and a component with no solder tape connection. Background Art

[0002] The thinning of solar cell wafers is an important direction for cost reduction and speed increase in the photovoltaic industry. According to statistics, for every 20 μm reduction in the thickness of the silicon wafer, the price can be reduced by 10%, and the corresponding component price can also be reduced by 5-6 cents / Wp. In addition, the thinning of solar cell wafers can also reduce the series resistance of solar cells, increase the fill factor of the cells, and improve the photoelectric conversion efficiency of the cells.

[0003] With the commercialization of Topcon cells, the cost issue will inevitably be involved. The thinning of battery wafers is an important direction for cost reduction of components. The current solution is to use low-temperature solder tapes for connection, but the low-temperature solder tapes have limited reduction in welding stress, poor reliability and welding tensile strength, and slow industrialization progress. Therefore, it is necessary to propose a battery and a component with no solder tape connection to at least partially solve the problems existing in the prior art. Summary of the Utility Model

[0004] A series of simplified concepts are introduced in the summary of the utility model part, which will be further elaborated in the specific implementation part. The summary of the utility model part does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0005] To at least partially solve the above problems, the utility model provides a battery and a component with no solder tape connection, including: a battery body, on which an upper screen layer and a lower screen layer are arranged, and two adjacent battery bodies are connected through the upper screen layer and the lower screen layer.

[0006] For the battery and the component with no solder tape connection according to the embodiment of the utility model, both the upper screen layer and the lower screen layer are set as copper screen layers.

[0007] For the battery and the component with no solder tape connection according to the embodiment of the utility model, the diameter of the copper wires in the copper screen layer is 0.1 mm - 0.5 mm.

[0008] For the battery and the component with no solder tape connection according to the embodiment of the utility model, the copper screen layer is laid on the battery body by electroplating or high-temperature sintering.

[0009] The battery and component with solderless connection according to an embodiment of the present utility model, the battery body includes a body layer, an alumina passivation layer is disposed on the upper surface of the body layer, an upper silicon nitride layer is disposed on the upper surface of the alumina passivation layer, a front electrode layer is disposed on the upper surface of the upper silicon nitride layer, and the upper screen layer is connected to the front electrode layer.

[0010] The battery and component with solderless connection according to an embodiment of the present utility model, a lower silicon nitride layer is disposed on the lower surface of the body layer, a back electrode layer is disposed on the lower surface of the lower silicon nitride layer, and the lower screen layer is connected to the back electrode layer.

[0011] The battery and component with solderless connection according to an embodiment of the present utility model, the body layer includes a P+ emitter, an N-type crystalline silicon, a tunneling silicon dioxide layer, and phosphorus-doped Poly-si8, and the P+ emitter 5, N-type crystalline silicon, tunneling silicon dioxide layer, and phosphorus-doped Poly-si are arranged in sequence from top to bottom.

[0012] The present utility model also provides a battery component, including: a component body, and the component body is formed by connecting at least two battery bodies as described above in series.

[0013] Between two adjacent battery bodies, solder paste or conductive adhesive is used for connection at the corresponding upper screen layer and lower screen layer.

[0014] Compared with the prior art, the present utility model has at least the following beneficial effects:

[0015] The present utility model provides a battery with solderless connection. The battery and component with solderless connection include: a battery body, an upper screen layer and a lower screen layer are disposed on the battery body, and two adjacent battery bodies are connected through the upper screen layer and the lower screen layer. Among them, the copper screen layer 111 is laid on the battery body by electroplating or high-temperature sintering. Through the design of the above structure, the stress during the connection of the batteries is reduced, and the crack initiation rate is greatly reduced, thereby realizing the thin-film design of the battery.

[0016] For the battery and component with solderless connection of the present utility model, other advantages, objectives and features of the present utility model will be partially reflected by the following description, and will also be understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of the present utility model.

[0019] Figure 2 This is a front structure schematic diagram of the present utility model.

[0020] Figure 3 This is a back structure schematic diagram of the present utility model.

[0021] Figure 4 This is a structure schematic diagram of the battery assembly in the present utility model. Detailed implementation manners

[0022] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments, enabling those skilled in the art to implement it with reference to the text of the specification.

[0023] It should be understood that terms such as "having", "comprising", and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0024] As Figures 1 - 3 shown, the present utility model provides a battery with solderless ribbon connection, including: a battery body 100, on which an upper screen layer 1 and a lower screen layer 11 are disposed, and adjacent battery bodies 100 are connected through the upper screen layer 1 and the lower screen layer 11. Further, both the upper screen layer 1 and the lower screen layer 11 are provided as copper screen layers 111. Furthermore, the diameter of the copper wires 112 in the copper screen layer 111 is 0.1 mm - 0.5 mm.

[0025] Among them, the copper screen layer 111 is laid on the battery body 100 by electroplating or high-temperature sintering. Through the design of the above structure, the stress during the connection of the batteries is reduced, and the crack initiation rate is significantly reduced, thereby realizing the thin-film design of the batteries.

[0026] Further, the battery body 100 includes a body layer, on the upper surface of which an alumina passivation layer 4 is disposed, on the upper surface of the alumina passivation layer 4 there is an upper silicon nitride layer 3, and on the upper surface of the upper silicon nitride layer 3 there is a front electrode layer 2, and the upper screen layer 1 is connected to the front electrode layer 2.

[0027] Furthermore, on the lower surface of the body layer there is a lower silicon nitride layer 9, on the lower surface of the lower silicon nitride layer 9 there is a back electrode layer 10, and the lower screen layer 11 is connected to the back electrode layer 10.

[0028] Among them, the body layer includes a P+ emitter 5, an N-type crystalline silicon 6, a tunneling silicon dioxide layer 7, and a phosphorus-doped Poly-si 8, which are sequentially arranged from top to bottom.

[0029] As Figure 4As shown in the figure, the present utility model provides a battery assembly, including: a component main body 200, which is formed by connecting at least two battery main bodies 100 in series. Among them, adjacent battery main bodies 100 are connected at the corresponding upper screen layer 1 and lower screen layer 11 using solder paste or conductive adhesive.

[0030] Specifically, when using solder paste or conductive adhesive to connect at the corresponding upper screen layer 1 and lower screen layer 11, and the component main body 200 is connected without welding tape, the component stress is reduced. As shown in Table 1 below, it is a comparison table of the crack initiation rates of the battery assembly using solder paste or conductive adhesive and a conventional battery assembly. Among them, the solder paste can be Sn60Pb40, Sn63Pb37, Sn43Pb43Bi14, Sn60Bi38Ag2 and other high-temperature or low-temperature solder pastes. Preferably, a low-temperature solder paste containing a Bi system can further reduce the welding stress; the main body of the conductive adhesive is composed of a matrix resin and a conductive filler, i.e., conductive particles. The resin can be one of epoxy resin, acrylic resin, and silicone system, and the conductive filler is one of silver paste or silver-coated copper.

[0031]

[0032] Table 1

[0033] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0034] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Although the embodiments of the present utility model have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present utility model. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to the specific details and the illustrated examples described herein.

Claims

1. A battery without solder strip connection, characterized in that: include: A battery main body (100) is provided with an upper screen layer (1) and a lower screen layer (11), and two adjacent battery main bodies (100) are connected via the upper screen layer (1) and the lower screen layer (11).

2. The battery without solder strip connection according to claim 1, characterized in that: The upper screen layer (1) and the lower screen layer (11) are both copper wire screen layers (111).

3. The battery without solder strip connection according to claim 2, characterized in that: The diameter of the copper wire (112) in the copper wire screen layer (111) is 0.1 mm-0.5 mm.

4. The battery without solder strip connection according to claim 2 or 3, characterized in that: The copper wire mesh layer (111) is laid on the battery body (100) by electroplating or high-temperature sintering.

5. The battery without solder ribbon connection according to claim 1, characterized in that: The battery body (100) comprises a body layer, an aluminum oxide passivation layer (4) is arranged on the upper surface of the body layer, an upper silicon nitride layer (3) is arranged on the upper surface of the aluminum oxide passivation layer (4), a front electrode layer (2) is arranged on the upper surface of the upper silicon nitride layer (3), and the upper screen layer (1) is connected to the front electrode layer (2).

6. The battery without solder ribbon connection according to claim 5, characterized in that: The lower surface of the body layer is provided with a lower silicon nitride layer (9), the lower surface of the lower silicon nitride layer (9) is provided with a back electrode layer (10), and the lower screen layer (11) is connected to the back electrode layer (10).

7. The battery without solder ribbon connection according to claim 5 or 6, characterized in that: The body layer comprises a P+ emitter (5), an N-type crystalline silicon (6), a tunneling silicon dioxide layer (7), and phosphorus-doped Poly-Si (8), wherein the P+ emitter (5), the N-type crystalline silicon (6), the tunneling silicon dioxide layer (7), and the phosphorus-doped Poly-Si (8) are arranged in sequence from top to bottom.

8. A battery assembly, characterized in that: include: A component body, wherein the component body is composed of at least two battery bodies (100) according to any one of claims 1 to 3 or 5 to 6 connected in series.

9. The battery assembly according to claim 8, characterized in that: Two adjacent battery bodies (100) are connected at the corresponding upper screen layer (1) and lower screen layer (11) using solder paste or conductive glue.

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