CN113299784B

CN113299784B - Photovoltaic module and method for manufacturing photovoltaic module

Info

Publication number: CN113299784B
Application number: CN202110541277.5A
Authority: CN
Inventors: 陈道远; 李令先; 周艳方
Original assignee: Shanghai Ja Solar Pv Technology Co ltd; JA Solar Technology Yangzhou Co Ltd
Current assignee: Shanghai Ja Solar Pv Technology Co ltd; JA Solar Technology Yangzhou Co Ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2023-11-24
Anticipated expiration: 2041-05-18
Also published as: CN113299784A

Abstract

At least some embodiments of the present disclosure provide photovoltaic modules and methods of manufacturing photovoltaic modules. The photovoltaic module includes a plurality of battery cells configured to receive light to generate electrical energy; and a heat conductive member, at least a portion of which is disposed in a gap between and in direct contact with the adjacent two battery cells. Since the heat conducting member is in direct contact with the battery cells, more efficient thermal communication can be established between adjacent battery cells of the photovoltaic module. Therefore, the temperature of the battery unit with the hot spots can be reduced, the overall working temperature of the photovoltaic module is balanced, and the reliability and the power generation performance of the photovoltaic module are improved.

Description

Photovoltaic module and method for manufacturing photovoltaic module

Technical Field

The present disclosure relates to a photovoltaic module and a method of manufacturing a photovoltaic module.

Background

The increased size of the cells of the photovoltaic module can reduce the cost of the cell manufacturing process. The large-size of the battery cells in the photovoltaic module is a trend of industry development, and the sizes of the battery cells are increasing year by year from 125mm, 156mm, 158mm, 168mm to 182mm, 210mm … … today. As the size of the battery cell increases, the heat dissipation condition of the photovoltaic module changes, resulting in an increase in the degree of temperature unevenness, and the problem of hot spots caused by local shielding becomes more and more remarkable.

The locations where hot spots typically occur are punctuated inside the assembly, and the temperature of the battery cells where hot spots occur may be higher than the battery cells at the periphery thereof. When the temperature of the hot spot of the battery component breaks through 170 ℃, the temperature resistance of the back plate with a high molecular structure is reached, and if the photovoltaic component works at the temperature of the hot spot for a long time, the back plate is easy to carbonize, so that the component is invalid.

Accordingly, there is an urgent need to provide a photovoltaic module capable of efficiently transferring heat of a battery cell at a high temperature.

Disclosure of Invention

At least some embodiments of the present disclosure provide a photovoltaic assembly comprising a plurality of battery cells configured to receive light to generate electrical energy; and a heat conductive member, at least a portion of which is disposed in a gap between and in direct contact with the adjacent two battery cells.

Since the heat conducting member is in direct contact with the battery cells, more efficient thermal communication can be established between adjacent battery cells of the photovoltaic module. The heat of the battery cells at high temperature can be quickly transferred to the battery cells at low temperature located therearound to lower the temperature of the battery cells at high temperature. Therefore, the temperature of the battery unit with the hot spots can be reduced, the overall working temperature of the photovoltaic module is balanced, and the reliability and the power generation performance of the photovoltaic module are improved. For example, under deteriorated conditions, the temperature of the battery cells in which hot spots occur may reach 170 ℃, while the temperature of the battery cells around the periphery thereof may be about 55 ℃. Because of the gaps of about 2mm between adjacent battery cells, the heat of the battery cells with hot spots is difficult to conduct to the battery cells with low temperature, and high temperature points with local heat accumulation are formed. The heat conductive member of the photovoltaic module according to the embodiments of the present disclosure can fill the gap between adjacent battery cells and directly contact the battery cells to enhance heat transfer between the adjacent battery cells, thereby eliminating such high temperature points.

Further, since the heat conductive member fills the gap between the adjacent two battery cells and is in direct contact with the two battery cells. Therefore, the heat conductive member can prevent the battery cell from being displaced. For example, in the case where two battery cells are connected by a belt-shaped conductive member, the heat conductive member prevents the battery cells from approaching or separating from each other during lamination, thereby avoiding the problem of hidden cracking of the battery cells in the lamination step of manufacturing the photovoltaic module, by avoiding the battery cells and the belt-shaped conductive member from being pressed or pulled against each other.

The heat conductive member is disposed between two adjacent battery cells among the plurality of battery cells. In one aspect, the thermally conductive member may be disposed between adjacent ones of all the battery cells in the photovoltaic module. On the other hand, the photovoltaic module may have other battery cells, and a heat conductive member is not provided between adjacent battery cells.

For example, in some embodiments, the thermally conductive member includes a base material and a thermally conductive material added to the base material.

The base material may be appropriately selected to enable the heat conductive member to be better filled in the gaps between the battery cells, or to enable the heat conductive member to have a certain strength, thermal stability, chemical stability, or the like. The addition of a thermally conductive material to the matrix material helps the thermally conductive member to establish more efficient thermal communication between the battery cells.

For example, in some embodiments, the thermally conductive material has a thermal conductivity greater than 10W/(mK).

For example, in some embodiments, the thermally conductive material includes one or more of graphite, carbon foam, silicon carbide, aluminum nitride and boron carbide, silicon dioxide and diamond.

For example, in some embodiments, the matrix material is configured to be capable of flowing during lamination of the photovoltaic module such that at least a portion thereof flows into a gap between two adjacent battery cells.

For example, in some embodiments, at least one selected from the group consisting of silicone, EVA, POE, PVB, and a coextrusion of EVA and POE.

Silica gel, EVA, POE, PVB are materials widely used in photovoltaic modules. The use of these materials as the matrix material facilitates the establishment of efficient thermal communication between the cells while reducing the manufacturing costs of the photovoltaic module. The heat conductive member including such a base material may be a sheet-like material piece that may be attached near the edges of two adjacent battery cells and then melted and flowed into the gaps of the battery cells in the lamination step of manufacturing the photovoltaic module. The manufacturing process is simple and the step of forming the heat conducting member is combined with the original step of manufacturing the photovoltaic module.

For example, in some embodiments, the matrix material is an adhesive gel configured to have fluidity before and when applied to the battery cells such that at least a portion thereof flows into the gap between two adjacent battery cells.

For example, in some embodiments, the adhesive glue is an EVA glue, a silicone-based glue, an acrylic glue, a polyurethane glue, or an epoxy glue.

The adhesive paste, which has fluidity before and when applied, can be sufficiently filled between adjacent two battery cells to form good thermal communication between the adjacent two battery cells.

For example, in some embodiments, the battery cell has a first side configured to face light and a second side opposite the first side. The heat conductive member includes a portion disposed at a first side of at least one of the adjacent two battery cells.

For example, in some embodiments, a portion of the thermally conductive member is disposed in the gap between two adjacent battery cells, and the remaining portion of the thermally conductive member is disposed on the first side of one of the two adjacent battery cells.

For example, in some embodiments, the thermally conductive member includes a first portion, a second portion, and an intermediate portion connecting the first portion and the second portion. The intermediate portion is disposed in a gap between two adjacent battery cells, and the first portion and the second portion are disposed on first sides of the two adjacent battery cells, respectively.

For example, in some embodiments, the thermally conductive member includes a first portion, a second portion, and an intermediate portion connecting the first portion and the second portion. The intermediate portion is disposed in a gap between two adjacent battery cells, the first portion is disposed on a first side of one of the two adjacent battery cells, and the second portion is disposed on a second side of the other of the two adjacent battery cells.

For example, in some embodiments, the thermally conductive member is transparent.

Since the heat conductive member is transparent, it does not shade the first side of the battery cell, thereby avoiding a decrease in the power generation efficiency of the battery cell.

For example, in some embodiments, the battery cell has a first side configured to face light and a second side opposite the first side. The heat conductive member is disposed in a gap between two adjacent battery cells and a second side of at least one of the two adjacent battery cells.

For example, in some embodiments, a portion of the thermally conductive member is disposed in the gap between two adjacent ones of the battery cells, and the remaining portion of the thermally conductive member is disposed on the second side of one of the two adjacent battery cells.

For example, in some embodiments, the thermally conductive member includes a first portion, a second portion, and an intermediate portion connecting the first portion and the second portion. The intermediate portion is disposed in a gap between two adjacent battery cells, and the first portion and the second portion are disposed on second sides of the two adjacent battery cells, respectively.

For example, in some embodiments, the thermally conductive member is opaque.

Since the heat conductive member is not disposed at the first side of the battery cell configured to face the light, the heat conductive member may be opaque.

For example, in some embodiments, the thermally conductive member is configured to be capable of reflecting light.

The heat conductive member can reflect light irradiated onto a gap between two battery cells back to the battery cells, thereby enhancing the power generation efficiency of the photovoltaic module.

For example, in some embodiments, the thermally conductive member includes a matrix material, a thermally conductive material added to the matrix material, and a reflective filler added to the matrix material, the reflective filler including one or more of lithopone, titanium dioxide, talc, lead white, mica, calcium carbonate, calcium sulfate, zinc oxide, antimony trioxide, magnesium oxide, magnesium carbonate, iron oxide, silica, zirconium dioxide, barium sulfate, and aluminum oxide.

For example, in some embodiments, the photovoltaic module further comprises a ribbon-shaped conductive member. The battery cell has a first side and a second side opposite the first side, and includes a first electrode disposed on the first side and a second electrode disposed on the second side. The adjacent two battery cells have the same orientation, one end of the conductive member is connected to the first electrode of one of the adjacent two battery cells, and the other end of the conductive member is connected to the second electrode of the other battery cell.

For example, in some embodiments, a plurality of battery cells are arranged in an array, the heat conductive member may be disposed between two adjacent columns of battery cells in a stripe-like structure or the heat conductive member may have a mesh-like structure.

The integrated mesh-like thermally conductive member establishes good thermal communication between the plurality of battery cells of the photovoltaic module. The heat of the battery cells at high temperature can be efficiently diffused to the plurality of battery cells at low temperature. The temperature of the battery cell where the hot spot occurs can be lowered more quickly and the overall operating temperature of the photovoltaic module is equalized.

For example, in some embodiments, the photovoltaic module has an arrangement plane, the battery cells extend parallel to the arrangement plane, and perpendicular projections of adjacent two battery cells on the arrangement plane overlap to have an overlap region in which at least a portion of the thermally conductive member fills in a gap between the two battery cells in a direction perpendicular to the arrangement plane.

The heat conductive member may be filled into the gap between the adjacent two battery cells in the direction perpendicular to the arrangement plane, for example, during lamination. Accordingly, the heat conductive member supports the battery cells to prevent the battery cells from approaching each other in the lamination process, particularly in the direction perpendicular to the arrangement plane, thereby avoiding the problem of the hidden crack of the battery cells in the lamination step of manufacturing the photovoltaic module by avoiding the extrusion of the battery cells and the ribbon-shaped conductive member to each other.

At least some embodiments of the present disclosure also provide a method of manufacturing a photovoltaic module, comprising the steps of: providing a plurality of battery cells configured to receive light to generate electrical energy and having a first side and a second side opposite the first side, the plurality of battery cells having the same orientation; providing a heat conductive member such that the heat conductive member is directly attached to and contacts adjacent two battery cells; providing a first attachment layer and a first back plate on a first side of the plurality of battery cells, the first attachment layer configured to attach the plurality of battery cells to the first back plate; providing a second attachment layer and a second back plate on a second side of the plurality of battery cells, the second attachment layer configured to attach the plurality of battery cells to the second back plate; and heating and laminating the laminate including the first back plate, the first attachment layer, the plurality of battery cells, the second attachment layer, and the second back plate such that at least a portion of the heat conductive member melts and flows into the gap between the first battery cell and the second battery cell.

For example, in some embodiments, the thermally conductive member comprises a matrix material and a thermally conductive material added to the matrix material, the matrix material selected from at least one of silicone, EVA, POE, PVB, and a co-extrusion of EVA and POE.

At least some embodiments of the present disclosure also provide a method of manufacturing a photovoltaic module, comprising the steps of: providing a plurality of battery cells configured to receive light to generate electrical energy and having a first side and a second side opposite the first side, the plurality of battery cells having the same orientation; providing a heat conductive member such that at least a portion of the heat conductive member fills in a gap between two adjacent battery cells and is in direct contact with the two adjacent battery cells; providing a first attachment layer and a first back plate on a first side of the plurality of battery cells, the first attachment layer configured to attach the plurality of battery cells to the first back plate; providing a second attachment layer and a second back plate on a second side of the plurality of battery cells, the second attachment layer configured to attach the plurality of battery cells to the second back plate; and heating and laminating a laminate including the first back sheet, the first attachment layer, the plurality of battery cells, the second attachment layer, and the second back sheet.

For example, in some embodiments, in the step of providing the heat conductive member, at least a portion of the heat conductive member flows into a gap between two adjacent battery cells.

For example, in some embodiments, the thermally conductive member is cured or remains cured during the heating and laminating steps.

For example, in some embodiments, the thermally conductive member includes a base material and a thermally conductive material added to the base material, the base material being an adhesive glue including at least one of EVA glue, silicone-based glue, acrylic glue, polyurethane glue, and epoxy glue.

Drawings

Fig. 1 shows a cross-sectional view of a single sided battery cell;

FIG. 2 shows a cross-sectional view of a double sided battery cell;

FIG. 3 shows a cross-sectional view of a photovoltaic module;

fig. 4 shows a schematic view of an electrically conductive member, battery cells having a first positive spacing from each other, and a first type of thermally conductive member on a second side of two adjacent battery cells prior to lamination in accordance with an embodiment of the present disclosure;

fig. 5 shows a schematic view of a battery cell having a first positive spacing from each other and a first type of thermally conductive member on a second side of two adjacent battery cells prior to lamination in accordance with an embodiment of the present disclosure;

Fig. 6 shows a schematic view of an electrically conductive member, battery cells having a first positive spacing from each other, and a first type of thermally conductive member on a second side of two adjacent battery cells after lamination according to an embodiment of the present disclosure;

fig. 7 shows a schematic view of a photovoltaic module after lamination, wherein a first type of thermally conductive member is on a second side of two adjacent cells, according to an embodiment of the present disclosure;

fig. 8 shows a schematic view of an electrically conductive member, battery cells having a first positive spacing from each other, and a first type of thermally conductive member on a first side of two adjacent battery cells after lamination according to an embodiment of the present disclosure;

fig. 9 shows a schematic view of an electrically conductive member, battery cells having a first positive spacing from each other, and a first type of thermally conductive member on a first side of one battery cell and a second side of the other battery cell of adjacent two battery cells prior to lamination according to an embodiment of the present disclosure;

fig. 10 shows a schematic view of battery cells having a first positive spacing from each other and a first type of thermally conductive member on a first side of one battery cell and a second side of the other battery cell of adjacent two battery cells prior to lamination according to an embodiment of the present disclosure;

Fig. 11 shows a schematic view of an electrically conductive member, battery cells having a first positive spacing from each other, and a first type of thermally conductive member on a first side of one battery cell and a second side of the other battery cell of adjacent two battery cells after lamination according to an embodiment of the present disclosure;

fig. 12 shows a schematic view of an electrically conductive member, battery cells having a second positive spacing from each other, and a second type of thermally conductive member on a second side of two adjacent battery cells, according to an embodiment of the present disclosure;

fig. 13 shows a schematic view of an electrically conductive member, battery cells having a second positive spacing from each other, and a second type of thermally conductive member on a first side of two adjacent battery cells, according to an embodiment of the present disclosure;

fig. 14 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a first type of thermally conductive member on a first side of one battery cell and a second side of the other battery cell of adjacent two battery cells after lamination according to an embodiment of the present disclosure;

fig. 15 shows a schematic view of a battery cell having a negative pitch to each other and a first type of heat conductive member on a first side of one battery cell and a second side of the other battery cell of adjacent two battery cells after lamination according to an embodiment of the present disclosure;

Fig. 16 shows a schematic view of a photovoltaic assembly after lamination showing an electrically conductive member and wherein a first type of thermally conductive member is on a first side of one cell and a second side of another cell of two adjacent cells, according to an embodiment of the present disclosure;

fig. 17 shows a schematic view of a photovoltaic assembly after lamination, without showing the electrically conductive members and wherein the first type of thermally conductive member is on a first side of one cell and a second side of the other cell of the adjacent two cells, according to an embodiment of the present disclosure;

fig. 18 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a first type of thermally conductive member on a first side of one of two adjacent battery cells prior to lamination in accordance with an embodiment of the present disclosure;

fig. 19 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a first type of thermally conductive member on a second side of one of the adjacent two battery cells prior to lamination in accordance with an embodiment of the present disclosure;

fig. 20 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a second type of thermally conductive member on a second side of one of the adjacent two battery cells prior to lamination in accordance with an embodiment of the present disclosure;

Fig. 21 shows a schematic view of a photovoltaic assembly after lamination showing an electrically conductive member and wherein a second type of thermally conductive member is on a second side of one of the adjacent two battery cells, according to an embodiment of the present disclosure;

fig. 22 shows a schematic view of a photovoltaic assembly after lamination, without showing the electrically conductive member and wherein the second type of thermally conductive member is on the second side of one of the adjacent two battery cells, according to an embodiment of the present disclosure;

fig. 23 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a second type of thermally conductive member on a first side of one of the adjacent two battery cells prior to lamination in accordance with an embodiment of the present disclosure;

fig. 24 shows a plan view of a photovoltaic module according to an embodiment of the present disclosure.

Detailed Description

SUMMARY

A photovoltaic module generally includes a first backsheet, a second backsheet, and a cell layer disposed between the first backsheet and the second backsheet in which a plurality of cells are arranged in an array. The battery cell may be a single sided battery cell or a double sided battery cell. A single-sided battery cell is a battery cell that can receive light from only one side and convert the light into electrical energy. For example, fig. 1 shows a cross-sectional view of a single sided battery cell. As shown in fig. 1, the single-sided battery cell includes a metal front electrode 111, a front surface antireflection film 112, an n-type doped emission layer 113, a p-type silicon layer 114, an aluminum layer 115, and a metal back electrode 116. Fig. 2 shows a cross-sectional view of a double sided battery cell. As shown in fig. 2, the double-sided battery cell includes a metal front electrode 111', a front surface antireflection film 112', a boron doped emission layer 113', an n-type silicon layer 114', a phosphorus doped back field (BSF) layer 115', a back antireflection film 116', and a metal back electrode 117'. The battery cell according to embodiments of the present disclosure may also have other configurations, such as the silicon layer 114 being n-type in fig. 1, the emission layer 113 being p-doped, the silicon layer 114' being p-type in fig. 2, the emission layer being n-doped, the present disclosure not being limited thereto.

Fig. 3 shows a cross-sectional view of a photovoltaic module. As shown in fig. 3, the photovoltaic module includes a first backsheet 150 configured on a side facing the light, a first attachment layer 160, a battery layer including battery cells 110 arranged in an array, a second attachment layer 170, and a second backsheet 180 configured on a side facing away from the light. The first attachment layer 160 is used to attach the first back plate 150 to the battery layer and the second attachment layer 170 is used to attach the second back plate 180 to the battery layer. Sunlight may be incident on the photovoltaic module from one side of the first backsheet 150. A method of manufacturing such a photovoltaic module may include: s01, sequentially stacking the first back plate 150, the first attachment layer 160, the battery layer, the second attachment layer 170, and the second back plate 180; s02, the stack including the first back sheet 150, the first attachment layer 160, the battery layer, the second attachment layer 170, and the second back sheet 180 is heated and laminated.

In some cases, the first and second back sheets 150, 180 may both be light transmissive, e.g., in the case of a photovoltaic module being a dual-glass module, the first and second back sheets 150, 180 are both glass back sheets that are both light transmissive, but the disclosure is not limited thereto, e.g., the photovoltaic module may be a double-sided light transmissive single-glass module. In some cases, the first backsheet 150 may be optically transmissive, such as a glass backsheet, and the second backsheet 180 may be opaque. For example, the second backsheet 180 may be a high molecular polymer material laminate including, for example, an insulating barrier layer, a fluorine-containing weather-resistant layer, a transitional bonding layer, or the like. The insulating barrier layer is, for example, PET (polyethylene terephthalate) or the like. The fluorine-containing weather resistant layer is, for example, a fluorine film such as PVDF (polyvinylidene fluoride) film, TEDLAR (registered trademark) film (polyvinyl fluoride film), or fluorocarbon resin. The transitional bonding layer is, for example, EVA (ethylene vinyl acetate), POE (polyethylene-octene elastomer), LDPE (low density polyethylene), PVDF film, TEDLAR film, or a fluororesin such as fluorocarbon resin, or the like.

Herein, a photovoltaic module in which both the first back sheet and the second back sheet are light transmissive is referred to as a double-sided light transmissive module, and a photovoltaic module in which the first back sheet is opaque and the second back sheet is light transmissive is referred to as a single-sided light transmissive module. The double sided light transmissive assembly may include a double sided battery cell and the single sided light transmissive assembly may include a single sided battery cell. Herein, "transparent" and "light transmitting" are used interchangeably to refer to the property of allowing light that can be utilized by the battery cell to pass through. "opaque" may be understood as "opaque".

The "first side" referred to in the present disclosure is an upper side in the drawing and may be a front surface or a light receiving surface of the battery cell, and herein, the first side, the front surface, and the light receiving surface are used interchangeably. The "second side" is the lower side in the figures, and may be the back or backlight side of the battery cell, which are used interchangeably herein.

As mentioned above, the photovoltaic module may generate hot spots that damage the photovoltaic module, and it is necessary to reduce the temperature of the photovoltaic module when the hot spots occur, thereby improving the reliability of the photovoltaic module. A photovoltaic module has a heat conductive layer, at least a portion of which overlaps with a gap between adjacent battery cells in a thickness direction of the photovoltaic module. In such a photovoltaic module, although there is a heat conductive layer in thermal communication with the battery cells, the heat conductive layer is not in direct contact with the battery cells, and thus, the heat conductive efficiency needs to be improved. There is a need to provide more efficient heat conduction to conduct the heat away from the cells, thereby inhibiting the temperature of the cells where hot spots form and equalizing the temperature of the entire photovoltaic module.

Further, during the heating and lamination process, displacement may occur between the battery cells in the battery layer. As a result, the distance between adjacent battery cells will change, e.g., decrease, which may result in a squeeze between the battery cells and the ribbon-shaped conductive members (e.g., solder ribbons) used to connect the battery cells, thereby resulting in a hidden crack of the battery cells.

Embodiments according to the present disclosure provide a photovoltaic module including a plurality of battery cells and a thermally conductive member. The plurality of battery cells are configured to receive light to generate electric energy, and the plurality of battery cells include two battery cells arranged adjacent to each other. At least a portion of the heat conductive member is disposed in a gap between and in direct contact with the adjacent two battery cells.

Since the heat conducting member is in direct contact with the battery cells, more efficient thermal communication can be established between adjacent battery cells of the photovoltaic module. Further, since the heat conductive member fills the gap between the adjacent two battery cells and is in direct contact with the two battery cells. Therefore, the heat conductive member may support the battery cells to prevent the battery cells from being displaced. In the lamination process, the battery cells are prevented from approaching each other, so that the battery cells and the belt-shaped conductive members are prevented from being pressed against each other, and the problem of hidden cracking of the battery cells in the lamination step of manufacturing the photovoltaic module is avoided.

It should be noted that, in the present disclosure, an object "between" two adjacent battery cells includes: when the two battery cells are on the same plane, the object is located between the two battery cells in the plane; and when the two battery cells are on different planes but there is an overlapping portion with each other, the object is located between the adjacent two battery cells in the projection direction perpendicular to the plane.

In the present disclosure, having a positive spacing between two adjacent battery cells or a spacing between two adjacent battery cells greater than 0 means that the two adjacent battery cells do not have an overlapping portion with each other, for example, in a direction perpendicular to a plane in which the two battery cells extend. Having a negative spacing between two adjacent battery cells or a spacing between two adjacent battery cells of less than 0 means that the two adjacent battery cells have an overlap with each other, for example, in a direction perpendicular to a plane in which the two battery cells extend.

The heat conductive member may include a base material and a heat conductive material added in the base material. The heat conductive member may be a first type of heat conductive member or a second type of heat conductive member, not limited thereto.

In the case of a first type of thermally conductive member, such as in the embodiments described with respect to fig. 4-11, 14-19, the matrix material may be configured to be capable of flowing during lamination of the photovoltaic module such that at least a portion thereof flows into the gap between two adjacent battery cells. For example, the matrix material may be selected from at least one of silica gel, EVA, POE, PVB (polyvinyl alcohol Ding Quanzhi) and a coextrudate of EVA and POE. The heat conductive material is uniformly added to the base material to improve the heat conductive property of the base material. For example, the thermal conductivity of the thermally conductive material is greater than 10W/(mK). For example, the thermally conductive material includes one or more of graphite, carbon foam, silicon carbide, aluminum nitride and boron carbide, silicon dioxide and diamond. For example, when the thermally conductive material is graphite, carbon foam, silicon carbide, aluminum nitride, or boron carbide, the thermally conductive member may be opaque; when the thermally conductive material is silica or diamond, the thermally conductive member may be transparent.

In the case of the second type of heat conductive member, such as in the embodiments described with respect to fig. 12-13, 20-23, the matrix material may be an adhesive gel configured to have fluidity before and when applied to the battery cells so that at least a portion thereof flows into the gap between two adjacent battery cells. For example, the adhesive glue may include at least one of EVA glue, silicon-based glue, acrylic glue, polyurethane glue, and epoxy glue. For example, the thermally conductive material includes one or more of graphite, carbon foam, silicon carbide, aluminum nitride and boron carbide, silicon dioxide and diamond. For example, when the thermally conductive material is graphite, carbon foam, silicon carbide, aluminum nitride, or boron carbide, the thermally conductive member may be opaque; when the thermally conductive material is silica or diamond, the thermally conductive member may be transparent.

The heat conducting member may comprise a portion arranged at a first side of at least one of the two adjacent battery cells, for example in the embodiments described in relation to fig. 8-11, 13-18, 23. In this case, at least a portion of the heat conductive member is disposed at the front surface of the battery cell. Therefore, the heat conductive member is preferably configured to be transparent to avoid it from decreasing the power generation efficiency of the battery cell.

The heat conducting member may also be arranged in the gap between two adjacent battery cells and the second side of at least one of the two adjacent battery cells, for example in the embodiments described in relation to fig. 4-7, 12, 19-22. In this case, the heat conductive member is not disposed at the front surface of the battery cell. Thus, the heat conducting member may be configured to be either transparent or opaque.

In case the heat conducting member is configured to be opaque, it is advantageous to provide the heat conducting member only in the gap between two adjacent battery cells and the second side of the battery cells, not in the first side of the battery cells. In the case where the heat conductive member is configured to be opaque, for example, the heat conductive member may preferably be configured to be capable of reflecting light, which may enhance the power generation efficiency of the photovoltaic module. A reflective filler may be added to the heat conductive member to enable the heat conductive member to reflect light, such as white reflective filler. The reflective filler includes, for example, one or more of lithopone, titanium dioxide, talc, lead white, mica, calcium carbonate, calcium sulfate, zinc oxide, antimony trioxide, magnesium oxide, magnesium carbonate, iron oxide, silica, zirconium dioxide, barium sulfate, and aluminum oxide.

In order to more clearly understand the positional relationship between the heat conductive member and the battery cell, as well as other aspects of the present disclosure, several types of embodiments are given below.

First class of embodiments

Referring to fig. 4 to 6, fig. 4 shows the band-shaped conductive member 130, fig. 5 does not show the band-shaped conductive member 130, and fig. 6 may be a schematic view after lamination of fig. 4. As shown in fig. 4 to 6, the photovoltaic module includes a plurality of battery cells 110 and a heat conductive member 120. The plurality of battery cells 110 are, for example, single-sided battery cells 110 or double-sided battery cells 110. The plurality of battery cells 110 have the same orientation and have a first side and a second side opposite the first side. Further, the battery cell 110 includes a first electrode disposed on the first side and a second electrode disposed on the second side. In the present embodiment, the heat conductive member 120 may be, for example, a first type of heat conductive member as described above, and the material of the heat conductive member 120 and other relevant matters may be referred to in the description of the overview. As shown in fig. 4 and 5, prior to the lamination step, the thermally conductive member 120 may be a piece of sheet material that may be attached (e.g., by bonding, laying, inserting, etc.) at adjacent edges of adjacent two battery cells 110 at the second side. Also, the heat conductive member 120 is configured to melt at the temperature of the lamination step to fill in the gap of the adjacent two battery cells 110 and directly contact the two adjacent battery cells 110. As shown in fig. 6, at least a portion of the heat conductive member 120 is filled into the gap between the adjacent two battery cells 110 after the lamination step. Specifically, as shown in fig. 6, after lamination, the heat conductive member 120 may include a first portion, a second portion, and an intermediate portion connecting the first portion and the second portion, wherein the intermediate portion is disposed in a gap between two adjacent battery cells 110, and the first portion and the second portion are disposed at second sides of the two adjacent battery cells 110, respectively. Since the heat conductive member 120 does not block the front surface of the battery cell, the heat conductive member may be transparent or opaque. Since the heat conductive member 120 is in direct contact with the battery cells 110, more efficient thermal communication can be established between adjacent battery cells 110 of the photovoltaic module to rapidly reduce the temperature of the battery cells 110 where hot spots occur and equalize the overall operating temperature of the photovoltaic module. In addition, the heat conductive member 120 can prevent or reduce the displacement of the battery cells 110, for example, in the lamination step of the photovoltaic module, improving the reliability and power generation performance of the photovoltaic module.

In addition, as shown in fig. 4 or 6, the photovoltaic module may further include a belt-shaped conductive member 130. The battery cells 110 have a first side and a second side opposite to the first side, and include a first electrode disposed on the first side and a second electrode disposed on the second side, adjacent two battery cells having the same orientation, one end of the band-shaped conductive member 130 may be connected to the first electrode of one battery cell 110 of the adjacent two battery cells 110, and the other end thereof may be connected to the second electrode of the other of the adjacent two battery cells 110 to connect the plurality of battery cells 110 in series. It should be noted that the adjacent battery cells 110 of the embodiments of the present disclosure are not limited to such a connection manner and are not limited to being connected in series with each other. One end of the band-shaped conductive member 130 may be connected to the first electrode of one of the adjacent two battery cells 110, and the other end thereof may be connected to the first electrode of the other of the adjacent two battery cells 110. For example, two adjacent battery cells 110 may be battery cells 110 in two battery strings connected in parallel, respectively.

As shown in fig. 4 and 6, the heat conductive member 120 may be attached to the battery cell 110 such that a portion of the band-shaped conductive member 130 is located between the heat conductive member 120 and the battery cell 110. In the case where two battery cells 110 are connected by the band-shaped conductive member 130, the heat conductive member 120 is filled in the gap between the adjacent two battery cells 110 during lamination, preventing the battery cells 110 from approaching or separating from each other, thereby avoiding the problem of the hidden crack of the battery cells 110 in the lamination step of manufacturing the photovoltaic module, by preventing the battery cells 110 and the band-shaped conductive member 130 from being pressed or pulled against each other.

When the heat conductive member 120 is opaque, for example, the heat conductive member 120 may also be configured to be capable of reflecting light. For example, at least sunlight can be reflected. For example, the heat conductive member 120 includes a light reflective material added in a matrix material. For example, the retroreflective material may be retroreflective filler. For example, the reflective filler may include one or more of lithopone, titanium dioxide, talc, lead white, mica, calcium carbonate, calcium sulfate, zinc oxide, antimony trioxide, magnesium oxide, magnesium carbonate, iron oxide, silica, zirconium dioxide, barium sulfate, and aluminum oxide. Fig. 7 shows a schematic view of a photovoltaic module after lamination, wherein the thermally conductive member is on the second side of two adjacent battery cells, according to an embodiment of the present disclosure. As shown in fig. 7, the photovoltaic module includes a plurality of battery cells 110, a band-shaped conductive member 130, a first back sheet 150, a second back sheet 180, a first attachment layer 160 configured to attach the plurality of battery cells 110 to the first back sheet 150, and a second attachment layer 170 configured to attach the plurality of battery cells 110 to the second back sheet 180. A portion of the heat conductive member 120 is filled in the gap between the adjacent battery cells 110, and the heat conductive member 120 is configured to be capable of reflecting light. The light irradiated onto the heat conductive member 120 may be reflected and then irradiated to the front side of the battery cell 110 by the reflection of, for example, the first back sheet 150, thereby enhancing the front side power generation efficiency of the photovoltaic module. For example, the heat conductive member 120 is configured to be capable of reflecting at least 70%, at least 80%, or at least 90% of light incident thereon. The heat conductive member 120 capable of reflecting light may be opaque. In the case where the heat conductive member 120 is provided at the rear surface of the battery cell 110, it is advantageous that the heat conductive member 120 is configured to be capable of reflecting light. Providing the heat conductive member 120 capable of reflecting light on the rear surface of the battery cell 110 may prevent the front surface of the battery cell from being blocked, so that the power generation efficiency of the battery cell 110 is not affected. Further, the inventors found that even in the case where the battery cell 110 is a double-sided battery cell and the heat conductive member 120 is provided at the rear surface of the battery cell 110, it may be advantageous that the heat conductive member 120 is configured to be capable of reflecting light. The heat conductive member 120 capable of reflecting light can increase front power generation efficiency, and although the heat conductive member 120 capable of reflecting light may cause a decrease in rear light emission efficiency of the battery cell 110 by shielding the rear surface of the battery cell 110, its influence on the total light emission efficiency of the battery cell 110 is small, and since the areas of the battery cell 110 shielded at the rear surface are the same, current mismatch does not occur, so that hot spots do not occur.

Second class of embodiments

Similar to the embodiment in fig. 4-6, in the present embodiment, the heat conductive member 120 may be, for example, a first type of heat conductive member as described above. Referring to fig. 8, unlike the embodiments shown in fig. 4 to 6, the heat conductive member 120 of the photovoltaic module shown in fig. 8 is attached to adjacent edges of two adjacent battery cells 110 at a first side before the lamination step, and then is filled into a gap between the two adjacent battery cells 110 after the lamination step. Specifically, as shown in fig. 8, after lamination, the middle portion of the heat conductive member 120 is disposed in the gap between the adjacent two battery cells 110, and the first and second portions of the heat conductive member 120 are disposed at the first sides of the adjacent two battery cells 110, respectively. In the present embodiment, since the heat conductive member 120 shields the front surface of the battery cell or the light receiving surface disposed to face the side of light, the heat conductive member is preferably transparent. The material of the heat conducting member 120 and other relevant matters can be seen from the summary and the relevant description in the first class of embodiments.

Third class of embodiments

Referring to fig. 9-11, wherein fig. 9 and 10 may be portions of the same photovoltaic module taken at different planes, fig. 9 shows the ribbon-shaped conductive member 130, fig. 10 does not show the ribbon-shaped conductive member 130, and fig. 11 may be a schematic view after lamination of fig. 9. Similar to the embodiment in fig. 4-6, in the present embodiment, the heat conductive member 120 may be, for example, a first type of heat conductive member as described above. Unlike the first type of embodiment shown in fig. 4 to 6, the heat conductive member 120 of the photovoltaic module shown in fig. 9 to 11 is attached to adjacent edges of the adjacent two battery cells 110 at the first side and the second side, respectively, before the lamination step, and then is filled into the gap between the adjacent two battery cells 110 after the lamination step. Specifically, as shown in fig. 11, after lamination, the middle portion of the heat conductive member 120 is disposed in the gap between the adjacent two battery cells 110, the first portion of the heat conductive member 120 is disposed at the first side of one battery cell 110 of the adjacent two battery cells 110, and the second portion is disposed at the second side of the other battery cell 110 of the adjacent two battery cells 110. In this embodiment, the heat conductive member 120 may be transparent. The material of the heat conducting member 120 and other relevant matters can be seen from the summary and the relevant description in the first class of embodiments.

In the first, second, and third types of embodiments, adjacent two battery cells 110 have a first positive spacing therebetween, which is, for example, greater than or equal to 1mm, however, the present disclosure is not limited thereto. Examples of having a second positive spacing (e.g., less than 1 mm) and a negative spacing between two adjacent battery cells 110 are given below:

fourth class of embodiments

As shown in fig. 12, the photovoltaic module includes a plurality of battery cells 110, a heat conductive member 120, and a band-shaped conductive member 130. The plurality of battery cells 110 have the same orientation and have a first side and a second side opposite the first side. Further, the battery cell 110 includes a first electrode disposed on the first side and a second electrode disposed on the second side. One end of the band-shaped conductive member 130 may be connected to a first electrode of one battery cell 110 of the adjacent two battery cells 110, and the other end thereof may be connected to a second electrode of the other of the adjacent two battery cells 110 to connect the plurality of battery cells 110 in series. In the present embodiment, the heat conductive member 120 may be, for example, a second type of heat conductive member as described above, and the material and other relevant matters thereof may be referred to in the summary. In this example, the thermally conductive member 120 is in a gel form having fluidity, which is applied (e.g., by coating, spraying, etc.) from the second side to near the adjacent edges of the adjacent two battery cells 110, and then flows between the adjacent two battery cells 110, before being applied to the battery cells 110. The heat conductive member 120 may then be cured, for example, by ultraviolet irradiation, heating, or left at room temperature. The heat conductive member 120 may maintain its morphology and position during the lamination step. In the present embodiment, since the heat conductive member 120 does not block the front surface of the battery cell, the heat conductive member may be transparent or opaque.

Since the heat conductive member 120 is in direct contact with the battery cells 110, more efficient thermal communication can be established between adjacent battery cells 110 of the photovoltaic module and displacement of the battery cells 110 can be avoided or reduced. Further, since the heat conductive member 120 has fluidity, it can better fill the gap between the adjacent two battery cells 110 before the lamination step, thereby better holding the battery cells 110 before the lamination step to avoid displacement of the battery cells 110 with respect to each other.

Fifth class of embodiments

Similar to the embodiment in fig. 12, in the present embodiment, the heat conductive member 120 may be, for example, a second type of heat conductive member as described above, and materials and other relevant matters thereof may be referred to in the summary and related description in the fourth type of embodiment. As shown in fig. 13, unlike the embodiment shown in fig. 12, in the embodiment shown in fig. 13, the heat conductive member 120 is applied from the first side to the vicinity of the adjacent edges of the adjacent two battery cells 110 and then flows between the adjacent two battery cells 110.

In the fourth and fifth embodiments, two adjacent battery cells 110 have a second positive spacing therebetween, which is smaller than the first positive spacing, for example, smaller than or equal to 1mm, and an adhesive paste having a certain fluidity when applied as a heat conductive member is advantageous in filling and retaining the heat conductive member between the two adjacent battery cells having the smaller second positive spacing, however, the present disclosure is not limited thereto.

Sixth class of embodiments

In the present embodiment, the heat conductive member 120 may be, for example, a first type of heat conductive member as described above, and materials and other relevant matters thereof may be referred to in the description of the overview. As shown in fig. 14 and 15, wherein fig. 14 shows the belt-shaped conductive member 130, fig. 15 does not show the belt-shaped conductive member 130. As shown in fig. 14 and 15, the photovoltaic module includes a plurality of battery cells 110, a heat conductive member 120, and a band-shaped conductive member 130. The photovoltaic module has an arrangement plane, with the battery cells 110 extending parallel to the arrangement plane. In this example, the spacing between adjacent two battery cells 110 is less than 0. That is, the perpendicular projections of the adjacent two battery cells 110 on the arrangement plane overlap to have an overlapping area, or a negative interval is provided between the adjacent two battery cells 110.

The plurality of battery cells 110 have the same orientation and have a first side and a second side opposite the first side. Further, the battery cell 110 includes a first electrode disposed on the first side and a second electrode disposed on the second side. One end of the band-shaped conductive member 130 may be connected to a first electrode of one battery cell 110 of the adjacent two battery cells 110, and the other end thereof may be connected to a second electrode of the other of the adjacent two battery cells 110 to connect the plurality of battery cells 110 in series. The heat conductive member 120 may be a sheet-like material piece having one end attached to a first side of one battery cell 110 and the other end of the heat conductive member 120 attached to a second side of the other battery cell 110 prior to the lamination step. Also, the heat conductive member 120 is configured to melt at the temperature of the lamination step to fill in the gaps in the overlapping region of the adjacent two battery cells 110 in the direction perpendicular to the arrangement plane and directly contact the two adjacent battery sheets.

Fig. 16 and 17 may be taken at different planes of the same photovoltaic module, wherein fig. 16 shows the ribbon-shaped conductive member 130 and fig. 17 does not show the ribbon-shaped conductive member 130. For example, the photovoltaic modules in fig. 16 and 17 may include the structures in fig. 14 and 15. In order to clearly show the band-shaped conductive member 130 and the heat conductive member 120, the gap between adjacent battery cells 110 is enlarged. As shown in fig. 16 and 17, the photovoltaic module includes a plurality of battery cells 110, a belt-shaped conductive member 130, a first back sheet 150, a second back sheet 180, a first attachment layer 160 configured to attach the plurality of battery cells 110 to the first back sheet 150, and a second attachment layer 170 configured to attach the plurality of battery cells 110 to the second back sheet 180. The heat conductive member 120 is configured to melt at the temperature of the lamination step to fill in the gaps of the adjacent two battery cells 110 and directly contact the two adjacent battery cells 110. Specifically, as shown in fig. 16 and 17, after lamination, the middle portion of the heat conductive member 120 is disposed in the gap between the adjacent two battery cells 110, the first portion of the heat conductive member 120 is disposed at the first side of one battery cell 110 of the adjacent two battery cells 110, and the second portion is disposed at the second side of the other battery cell 110 of the adjacent two battery cells 110.

Since the heat conductive member 120 is in direct contact with the battery cells 110, more efficient thermal communication can be established between adjacent battery cells 110 of the photovoltaic module and displacement of the battery cells 110 can be avoided or reduced. During lamination, the space on the side of the battery cell 110 where another battery cell 110 adjacent thereto is located may be at least partially filled by the heat conductive member 120 (e.g., at least in the vicinity of the other battery cell 110) to prevent the battery cell 110 from moving toward the other battery cell 110, ensuring that the distance between adjacent battery cells 110 is greater than the thickness of the conductive member 130, thereby avoiding the battery cell 110 from pressing the conductive member 130. During lamination, particularly in a direction perpendicular to the arrangement plane, the heat conductive members 120 filled in the gaps between adjacent battery cells 110 (e.g., the lateral flow of the material of the heat conductive members 120 generally perpendicular to the arrangement plane fills) may support the battery cells 110 to prevent adjacent battery cells 110 from approaching each other, thereby avoiding the problem of the battery cells 110 being crushed against each other with the ribbon-shaped conductive members 130, and avoiding the hidden crack of the battery cells 110 during the lamination step of manufacturing the photovoltaic module.

Seventh class of embodiments

Fig. 18 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a thermally conductive member on a first side of one of the adjacent two battery cells prior to lamination according to an embodiment of the present disclosure. 14-17, the thermally conductive member 120 may be, for example, a first type of thermally conductive member as described above, the materials and other relevant matters of which may be found in the summary and related discussion of the sixth type of embodiments. In the overlapping region, at least a portion of the heat conductive member 120 will fill in the gap between the two battery cells 110 in the direction perpendicular to the arrangement plane during lamination. Unlike the photovoltaic module shown in fig. 14 to 17, the heat conductive member 120 of the photovoltaic module shown in fig. 18 is attached to the adjacent edges of the adjacent two battery cells 110 at the first side of the battery cells 110 away from the first side before the lamination step, and then is filled into the gap between the adjacent two battery cells 110 after the lamination step. For example, after lamination, a portion of the heat conductive member 120 is disposed in the gap between the adjacent two battery cells 110 and the remaining portion thereof is disposed on the first side of one battery cell 110 of the adjacent two battery cells 110.

Eighth class of embodiments

Fig. 19 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a thermally conductive member on a second side of one of the adjacent two battery cells prior to lamination according to an embodiment of the present disclosure. 14-17, the thermally conductive member 120 may be, for example, a first type of thermally conductive member as described above, the materials and other relevant matters of which may be found in the summary and related discussion of the sixth type of embodiments. In the overlapping region, at least a portion of the heat conductive member 120 will fill in the gap between the two battery cells 110 in the direction perpendicular to the arrangement plane during lamination. Unlike the photovoltaic module shown in fig. 14 to 17, the heat conductive member 120 of the photovoltaic module shown in fig. 19 is attached to the adjacent edges of the adjacent two battery cells 110 at the second side of the battery cells 110 away from the second side of the two battery cells 110 before the lamination step, and then is filled into the gap between the adjacent two battery cells 110 after the lamination step. For example, after lamination, a portion of the heat conductive member 120 is disposed in the gap between the adjacent two battery cells 110 and the remaining portion thereof is disposed on the second side of one battery cell 110 of the adjacent two battery cells 110. Further, in this example, the heat conductive member 120 may be configured to be capable of reflecting light. For example, the heat conductive member 120 includes a light reflective material added in a matrix material. For example, the retroreflective material may be retroreflective filler.

Ninth class of embodiments

In the present embodiment, the heat conductive member 120 may be, for example, a second type of heat conductive member as described above, and materials and other relevant matters thereof may be referred to in the description of the overview. As shown in fig. 20-22, where fig. 21 and 22 may be the same photovoltaic module taken at different planes, fig. 21 shows the ribbon conductive member 130, fig. 22 does not show the ribbon conductive member 130, and fig. 20 may be a schematic view of a portion of the photovoltaic modules of fig. 21 and 22 prior to lamination. As shown in fig. 20 to 22, the photovoltaic module includes a plurality of battery cells 110, a heat conductive member 120, and a band-shaped conductive member 130. The plurality of battery cells 110 have the same orientation and have a first side and a second side opposite the first side. Further, the battery cell 110 includes a first electrode disposed on the first side and a second electrode disposed on the second side. One end of the band-shaped conductive member 130 may be connected to a first electrode of one battery cell 110 of the adjacent two battery cells 110, and the other end thereof may be connected to a second electrode of the other of the adjacent two battery cells 110 to connect the plurality of battery cells 110 in series. In this example, the heat conductive member 120 is in a gel shape having fluidity, which is applied from the second side of the battery cells 110 distant from the second side to the vicinity of the adjacent edges of the adjacent two battery cells 110, and then flows between the adjacent two battery cells 110, before being applied to the battery cells 110. The heat conductive member 120 may then be cured. For example, a portion of the heat conductive member 120 is disposed in a gap between the adjacent two battery cells 110 and the remaining portion thereof is disposed at the second side of one battery cell 110 of the adjacent two battery cells 110. The heat conductive member 120 may maintain its morphology and position during the lamination step.

Since the heat conductive member 120 is in direct contact with the battery cells 110, more efficient thermal communication can be established between adjacent battery cells 110 of the photovoltaic module and displacement of the battery cells 110 can be avoided or reduced. The heat conductive member 120 filled in the gaps between the adjacent battery cells 110 may support the battery cells 110 to prevent the adjacent battery cells 110 from approaching each other during lamination, particularly in a direction perpendicular to the arrangement plane, thereby avoiding the problem of the hidden crack of the battery cells 110 in the lamination step of manufacturing the photovoltaic module, by avoiding the extrusion of the battery cells 110 and the ribbon-shaped conductive member 130 to each other.

Tenth class of embodiments

Fig. 23 shows a schematic view of an electrically conductive member, battery cells having a negative spacing from each other, and a thermally conductive member on a first side of one of the adjacent two battery cells prior to lamination according to an embodiment of the present disclosure. Similar to the embodiment shown in fig. 20-22, the heat conducting member 120 may be, for example, a second type of heat conducting member as described above, the materials and other relevant matters of which may be seen from the summary and the relevant description in the ninth embodiment. In the overlapping region, at least a portion of the heat conductive member 120 will fill in the gap between the two battery cells 110 in the direction perpendicular to the arrangement plane during lamination. Unlike the photovoltaic module shown in fig. 20 to 22, the heat conductive member 120 of the photovoltaic module shown in fig. 23 is attached to adjacent edges of the adjacent two battery cells 110 at a first side of the two battery cells 110 away from the first side before the lamination step, and then fills in a gap between the adjacent two battery cells 110. The heat conductive member 120 may then be cured. For example, a portion of the heat conductive member 120 is disposed in a gap between the adjacent two battery cells 110 and the remaining portion thereof is disposed at a first side of one battery cell 110 of the adjacent two battery cells 110. The heat conductive member 120 may maintain its morphology and position during the lamination step.

The overall structure of the photovoltaic module according to the present disclosure is described below by way of example, but the present disclosure is not limited to this example.

Eleventh class of embodiments

Fig. 24 shows a plan view of a photovoltaic module according to an embodiment of the present disclosure. As shown in fig. 24, the photovoltaic module includes 20×6 battery cells 110 arranged in an array. 10 adjacent battery cells 110 in each column of the plurality of battery cells 110 are connected in series to form a battery string, and then each two adjacent battery strings are connected in series and then are connected in parallel with two battery strings which are connected in series in the opposite columns. At least a portion of the heat conductive member 120 is disposed between all adjacent battery cells 110 to be net-shaped, including two battery cells 110 electrically connected through the band-shaped conductive member 130 in one battery string and two battery cells 110 not directly electrically connected in the adjacent battery string.

Furthermore, in some other embodiments, the heat conductive member 120 may be disposed between two adjacent columns of the battery cells 110 in a bar-shaped structure.

The method of manufacturing the photovoltaic module according to the present disclosure is described below by way of examples, but the present disclosure is not limited to these examples.

Twelfth class of embodiments

In the present embodiment, the manufacturing method can be used, for example, to manufacture the photovoltaic module described with reference to fig. 4 to 9, and fig. 14 to 19. The method comprises the following steps:

S11, providing a plurality of battery cells 110 configured to receive light to generate electrical energy and having a first side and a second side opposite the first side, the plurality of battery cells 110 having the same orientation;

s12, the heat conductive member 120 is provided such that the heat conductive member 120 is directly attached to and contacts the adjacent two battery cells 110;

s13, providing a first attachment layer 160 and a first back plate 150 on a first side of the plurality of battery cells 110, the first attachment layer 160 configured to attach the plurality of battery cells 110 to the first back plate 150;

s14, providing a second attachment layer 170 and a second back plate 180 on a second side of the plurality of battery cells 110, the second attachment layer 170 configured to attach the plurality of battery cells 110 to the second back plate 180; and

s15, the stack including the first back plate 150, the first attachment layer 160, the plurality of battery cells 110, the second attachment layer 170, and the second back plate 180 is heated and laminated such that at least a portion of the heat conductive member 120 melts and flows into the gap between the first battery cell 110 and the second battery cell 110.

In the present embodiment, the heat conductive member 120 may include a base material and a heat conductive material added in the base material. For example, the matrix material is configured to be capable of flowing during lamination of the photovoltaic module such that at least a portion thereof flows into the gap between two adjacent battery cells 110. For example, the matrix material is selected from at least one of silicone, EVA, POE, PVB, and a coextrusion of EVA and POE.

In step S11, the plurality of battery cells 100 may be connected using the conductive member 130, for example, in the manner shown in fig. 24. In step S12, the heat conductive member 120 may be disposed in a flat, insert, and coating manner.

Thirteenth class of embodiments

In this embodiment, the manufacturing method includes:

s21, providing a plurality of battery cells 110 configured to receive light to generate electrical energy and having a first side and a second side opposite the first side, the plurality of battery cells 110 having the same orientation;

s22, providing the heat conductive member 120 such that at least a portion of the heat conductive member 120 fills in a gap between two adjacent battery cells 110 and is in direct contact with the two adjacent battery cells 110;

s23, providing a first attachment layer 160 and a first back plate 150 on a first side of the plurality of battery cells 110, the first attachment layer 160 configured to attach the plurality of battery cells 110 to the first back plate 150;

s24, providing a second attachment layer 170 and a second back plate 180 on a second side of the plurality of battery cells 110, the second attachment layer 170 configured to attach the plurality of battery cells 110 to the second back plate 180; and

s25, a stack including the first back sheet 150, the first attachment layer 160, the plurality of battery cells 110, the second attachment layer 170, and the second back sheet 180 is heated and laminated.

In step S21, the plurality of battery cells 100 may be connected using the conductive member 130, for example, in the manner shown in fig. 24.

In the present embodiment, the heat conductive member 120 may include a base material and a heat conductive material added in the base material.

In the present embodiment, in the step of heating and laminating, the heat conductive member may be cured or kept in a cured state.

In some examples, at least a portion of the heat conductive member may flow into a gap between two adjacent battery cells and then be cured in step S22, and the heat conductive member remains in a cured state in step S25. For example, in the case of manufacturing the photovoltaic module described with reference to fig. 12 to 13 and 20 to 23. For example, the base material may be an adhesive glue including at least one of EVA glue, silicon-based glue, acrylic glue, polyurethane glue, and epoxy glue.

Further, in some examples, at least a portion of the heat conductive member may flow into a gap between two adjacent battery cells in step S22 and then be cured in step S25.

Further, in some examples, at least a portion of the heat conductive member may be inserted into a gap between two adjacent battery cells in step S22, and then remain in an inserted state without melting in step S25.

The present disclosure describes at least the following technical solutions:

technical scheme 1, a photovoltaic module includes:

a plurality of battery cells configured to receive light to generate electrical energy; and

and a heat conductive member, at least a portion of which is disposed in a gap between and in direct contact with the adjacent two of the battery cells.

Technical solution 2, the photovoltaic module according to claim 1, wherein

The heat conductive member includes a base material and a heat conductive material added in the base material.

Technical solution 3, the photovoltaic module according to claim 2, wherein

The heat conduction coefficient of the heat conduction material is more than 10W/(m.K).

Technical solution 4, the photovoltaic module according to technical solution 2, wherein

The thermally conductive material comprises one or more of graphite, carbon foam, silicon carbide, aluminum nitride and boron carbide, silicon dioxide and diamond.

Technical solution 5, the photovoltaic module according to claim 2, wherein

The base material is configured to be capable of having fluidity during lamination of the photovoltaic module so that at least a portion thereof flows into a gap between two adjacent ones of the battery cells.

Technical solution 6, the photovoltaic module according to technical solution 2, wherein

The matrix material is selected from at least one of silica gel, EVA, POE, PVB and a coextrudate of EVA and POE.

Claim 7, the photovoltaic module according to claim 2, wherein

The base material is an adhesive gel configured to have fluidity before and when applied to the battery cells so that at least a portion thereof flows into a gap between two adjacent battery cells.

According to the technical scheme 8, the photovoltaic module according to the technical scheme 7, wherein the adhesive glue comprises at least one of EVA glue, silicon-based glue, acrylic acid glue, polyurethane glue and epoxy resin glue.

Technical solution 9, the photovoltaic module according to claim 1, wherein

The battery cell has a first side configured to face light and a second side opposite the first side,

the heat conductive member includes a portion disposed at a first side of at least one of the adjacent two battery cells.

Technical solution 10, the photovoltaic module according to claim 9, wherein

A portion of the heat conductive member is disposed in a gap between two adjacent battery cells, and the remaining portion of the heat conductive member is disposed on a first side of one of the two adjacent battery cells.

Technical solution 11, the photovoltaic module according to claim 9, wherein

The heat conductive member includes a first portion, a second portion and an intermediate portion connecting the first portion and the second portion,

the intermediate portion is disposed in a gap between two adjacent battery cells, and the first portion and the second portion are disposed on first sides of the two adjacent battery cells, respectively.

Technical solution 12, the photovoltaic module according to claim 9, wherein

the intermediate portion is disposed in a gap between two adjacent battery cells, the first portion is disposed on a first side of one of the two adjacent battery cells, and the second portion is disposed on a second side of the other of the two adjacent battery cells.

The photovoltaic module according to any one of the claims 13, 9-12, wherein

The heat conductive member is transparent.

Technical solution 14, the photovoltaic module according to claim 1, wherein

The heat conductive member is disposed in a gap between two adjacent battery cells and a second side of at least one of the two adjacent battery cells.

Technical solution 15, the photovoltaic module according to claim 14, wherein

A portion of the heat conductive member is disposed in a gap between adjacent two of the battery cells, and the remaining portion of the heat conductive member is disposed on a second side of one of the adjacent two of the battery cells.

Technical solution 16, the photovoltaic module according to claim 14, wherein

the intermediate portion is disposed in a gap between two adjacent battery cells, and the first portion and the second portion are disposed on second sides of the two adjacent battery cells, respectively.

The photovoltaic module of claim 17, any one of the photovoltaic modules of claims 14-16, wherein

The thermally conductive member is opaque.

Technical solution 18, the photovoltaic module according to claim 17, wherein

The heat conductive member is configured to be capable of reflecting light.

The photovoltaic module according to claim 19, wherein

The heat conductive member includes a base material, a heat conductive material added in the base material, and a reflective filler added in the base material, the reflective filler including one or more of lithopone, titanium dioxide, talc, lead white, mica, calcium carbonate, calcium sulfate, zinc oxide, antimony trioxide, magnesium oxide, magnesium carbonate, iron oxide, silica, zirconium dioxide, barium sulfate, and aluminum oxide.

Technical solution 20, the photovoltaic module according to claim 1, further comprising:

a conductive member in the form of a strip,

the battery cell has a first side and a second side opposite the first side, and includes a first electrode disposed on the first side and a second electrode disposed on the second side,

the adjacent two battery cells have the same orientation, one end of the conductive member is connected to the first electrode of one of the adjacent two battery cells, and the other end of the conductive member is connected to the second electrode of the other battery cell.

Technical solution 21, the photovoltaic module according to claim 1, wherein

The plurality of battery cells are arranged in an array,

the heat conducting member is arranged between two adjacent rows of battery cells in a strip-shaped structure or is in a net-shaped structure.

Technical solution 22, the photovoltaic module according to claim 1, wherein

The photovoltaic module has an arrangement plane, the battery cells extend parallel to the arrangement plane, and perpendicular projections of adjacent two of the battery cells on the arrangement plane overlap to have an overlapping region in which at least a portion of the heat conductive member fills in a gap between the two battery cells in a direction perpendicular to the arrangement plane.

Technical solution 23, a method for manufacturing a photovoltaic module, comprising:

providing a plurality of battery cells configured to receive light to generate electrical energy and having a first side and a second side opposite the first side, the plurality of battery cells having the same orientation;

providing a heat conducting member such that the heat conducting member is directly attached to and contacts adjacent two of the battery cells;

providing a first attachment layer and a first back plate on a first side of the plurality of battery cells, the first attachment layer configured to attach the plurality of battery cells to the first back plate;

Providing a second attachment layer and a second back plate on a second side of the plurality of battery cells, the second attachment layer configured to attach the plurality of battery cells to the second back plate; and

the laminate including the first back sheet, the first attachment layer, the plurality of battery cells, the second attachment layer, and the second back sheet is heated and laminated such that at least a portion of the heat conductive member melts and flows into the gap between the first battery cell and the second battery cell.

Claim 24, the manufacturing method according to claim 23, wherein

The heat conductive member includes a base material selected from at least one of silicone rubber, EVA, POE, PVB, and a coextrudate of EVA and POE, and a heat conductive material added in the base material.

Technical solution 25, a method for manufacturing a photovoltaic module, comprising:

providing a heat conductive member such that at least a portion of the heat conductive member fills in a gap between and is in direct contact with two adjacent battery cells;

a laminate including a first back sheet, a first attachment layer, a plurality of battery cells, a second attachment layer, and a second back sheet is heated and laminated.

Claim 26, the manufacturing method according to claim 25, wherein,

in the step of providing a heat conductive member, the at least a portion of the heat conductive member flows into a gap between two adjacent battery cells.

Claim 27, the manufacturing method according to claim 25, wherein,

in the heating and laminating step, the heat conductive member is cured or kept in a cured state.

Claim 28, the manufacturing method according to claim 25, wherein

The heat conducting member comprises a base material and a heat conducting material added in the base material, wherein the base material is adhesive glue, and the adhesive glue comprises at least one of EVA glue, silicon-based glue, acrylic glue, polyurethane glue and epoxy resin glue.

It should be noted that, in the method described in the present disclosure, the steps in the method may be performed in other orders or in parallel without creating contradictions.

It is to be noted that in the above embodiments, adjacent battery cells have the same orientation, however, the present disclosure is not limited thereto. For example, adjacent cells may have opposite orientations.

It should be understood that the present disclosure is not limited to the embodiments described above, that features of these embodiments may be combined or omitted in any reasonable manner, and that other features may be added.

The scope of the present disclosure is defined not by the above-described embodiments but by the appended claims and their equivalents.

Claims

1. A photovoltaic module, comprising:

a plurality of battery cells configured to receive light to generate electrical energy, the battery cells having a first side and a second side opposite the first side; and

a heat conductive member, at least a portion of which is disposed in a gap between and in direct contact with adjacent two of the battery cells,

wherein the plurality of battery cells are arranged in an array,

the heat conductive member is disposed between two adjacent rows of battery cells in a stripe-shaped structure or the heat conductive member is in a net-shaped structure such that the heat conductive member covers only a portion of the first side and the second side of each of the battery cells,

2. The photovoltaic assembly of claim 1, wherein

3. The photovoltaic assembly of claim 2, wherein

4. The photovoltaic assembly of claim 2, wherein

5. The photovoltaic assembly of claim 2, wherein

6. The photovoltaic assembly of claim 2, wherein

7. The photovoltaic assembly of claim 2, wherein

8. The photovoltaic module of claim 7, wherein the adhesive glue comprises at least one of EVA glue, silicone-based glue, acrylic glue, polyurethane glue, and epoxy glue.

9. The photovoltaic assembly of claim 1, wherein

The first side is configured to face light.

10. The photovoltaic assembly of claim 9, wherein

The heat conductive member is transparent.

11. The photovoltaic assembly of claim 1, wherein

The thermally conductive member is opaque.

12. The photovoltaic assembly of claim 11, wherein

The heat conductive member is configured to be capable of reflecting light.

13. The photovoltaic assembly of claim 12, wherein

14. The photovoltaic assembly of claim 1, further comprising:

a conductive member in the form of a strip,

the battery cell includes a first electrode disposed on the first side and a second electrode disposed on the second side,

15. The photovoltaic assembly of claim 1, wherein

16. A method of manufacturing a photovoltaic module, comprising:

heating and laminating a laminate comprising a first back sheet, a first attachment layer, a plurality of battery cells, a second attachment layer and a second back sheet,

wherein the plurality of battery cells are arranged in an array,

17. The manufacturing method according to claim 16, wherein,

18. The manufacturing method according to claim 16, wherein,

19. The manufacturing method according to claim 16, wherein