CN216903005U - Solar cell module and electric equipment - Google Patents

Abstract

The application discloses solar module and consumer. The solar cell module comprises a plurality of sub-cells which are sequentially connected in series, a connecting through hole is formed between the back electrode of each sub-cell and the bottom electrode of the sub-cell adjacent to the back electrode of the sub-cell, and a non-planar area is arranged at the position, corresponding to the connecting through hole, of the bottom electrode; the connecting through hole is filled with a conductive part to connect the back electrode and the bottom electrode of the adjacent sub-battery, and the conductive part completely covers the non-planar area. The contact area between the conductive part and the bottom electrode is increased by the non-planar region, so that the contact resistance is reduced, the current output is improved, and the efficiency of the solar cell module is effectively improved.

Description

Solar cell module and electric equipment

Technical Field

The application relates to the field of batteries, in particular to a solar cell module and electric equipment.

Background

With the development and progress of society, batteries, especially solar thin film batteries, as new energy sources rapidly enter the field of vision of people, and are widely applied to various fields.

In the solar thin film cell, a bottom electrode conductive layer, an electron transport layer, a light absorption layer, a hole transport layer, and a back electrode conductive layer are sequentially formed on a substrate by using wet and dry coating techniques, and a designer divides the cell into a plurality of sub-cells by using an internal interconnection technique in order to increase the efficiency of the solar cell, and realizes the output effect of high voltage or high current by using different series connection modes.

However, in the prior art, the connection in the series connection process is too simple, which often causes the loss of short-circuit current inside the cell, thereby resulting in poor filling factor and finally affecting the performance and efficiency of the solar thin film cell.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the application provides a solar module and consumer, can effectively solve the connection of current solar thin film battery series connection in-process too simply, often can cause the inside short circuit current loss of battery, leads to its fill factor relatively poor, influences the problem of solar thin film battery's performance and efficiency.

In a first aspect, the present application provides a solar cell module comprising

A plurality of subcells connected in series in sequence, wherein:

a connecting through hole is arranged between the back electrode of the sub-cell and the bottom electrode of the sub-cell adjacent to the back electrode, and a non-planar area is arranged at the position, corresponding to the connecting through hole, of the bottom electrode;

the connecting through hole is filled with a conductive part to connect the back electrode and the bottom electrode of the adjacent sub-battery, and the conductive part completely covers the non-planar area.

In the technical scheme of the embodiment of the application, the connecting channels of the back electrodes and the bottom electrodes of the adjacent sub-batteries are formed through the connecting through holes, and the conductive parts are arranged in the connecting through holes to realize the mutual electric connection of the back electrodes and the bottom electrodes of the adjacent sub-batteries, so that the serial connection of the adjacent sub-batteries is realized; and simultaneously, a non-planar area is arranged at the position of the bottom electrode corresponding to the connecting through hole, for example: unevenness's surface, grooved surface, the conducting part covers the non-planar area completely and then increases the area of contact of conducting part and electrode to reduce contact resistance, promote current output, thereby effectively improve solar module's efficiency.

In some embodiments, the non-planar region covers at least a portion of the open end of the connecting via toward a forward projection of the connecting via. The non-planar region may correspond to a portion of the opening of the connection via, may correspond to the opening of the connection via completely, or may be larger than the opening of the connection via, as long as the contact area between the conductive portion and the bottom electrode can be increased, which has the effect of reducing the contact resistance.

In some embodiments, the non-planar region comprises a groove;

the groove extends from the surface of the bottom electrode to the inside of the bottom electrode along the thickness direction of the bottom electrode, and the opening of the groove faces the back electrode. Specifically, the non-planar region may be provided as a groove, the opening of the groove faces the connection via hole, the groove bottom extends toward the inside of the bottom electrode, and the conductive portion fills up the groove when filling the connection via hole, so as to increase the contact area with the bottom electrode.

In some embodiments, the depth of the recess is less than the thickness of the bottom electrode; for example: 10nm-500nm, so that the arrangement of the groove can not only play a role in increasing the contact area, but also can not penetrate through the bottom electrode, and the intact and normal work of the bottom electrode is ensured.

In some embodiments, a dimension of the groove in the first direction is less than or equal to a dimension of the connecting via in the first direction;

the first direction is the direction in which a sub-cell points towards its neighboring sub-cell. Wherein, solar module is solar energy thin film battery, connect the via hole and arrange the invalid electricity generation district of adjacent subcell in usually, and then need guarantee that the scope in invalid electricity generation district is as little as possible, with the output efficiency of increase solar module, so under the prerequisite that can reach increase area of contact, with the size that the recess set up along the size of first direction be less than or equal to the size of connecting the via hole, the size of recess changes along with the size of connecting the via hole promptly, it can to design on the current general design basis size of connecting the via hole that is the P2 score line, for example: 10um-150 um.

In some embodiments, the groove bottom of the groove is arc-shaped. In order to increase the contact area between the conductive portion and the bottom electrode as much as possible, the bottom of the groove is arc-shaped in the present embodiment.

In some embodiments, the groove bottom of the groove has a plurality of protrusions; or the groove bottom of the groove is provided with a plurality of channels which are arranged side by side or staggered. The groove bottom of the groove is provided with a plurality of protruding parts or a plurality of channels which are arranged side by side or in a staggered manner on the basis of the groove, so that the concave-convex characteristic of the groove bottom can be further increased, and the contact area between the conductive part and the bottom electrode is further increased.

In some embodiments, the conductive portion and the back electrode are made of the same material. The conductive part is made of the same material as the back electrode, and the conductive part and the back electrode can be synchronously arranged to form an integrated structure, so that the connecting resistance of the conductive part and the back electrode is reduced, and the lifting current output has positive influence on the reduction of the contact resistance of the solar cell module.

In some embodiments, the solar cell module includes a substrate, a first electrode layer, a first conductive layer, an absorption layer, a second conductive layer, and a second electrode layer, which are sequentially stacked; to form a solar thin film cell, for example: perovskite solar thin film cells;

a plurality of first grooves are arranged on the first electrode layer side by side along the length or width direction of the first electrode layer so as to divide the first electrode layer into a plurality of bottom electrodes;

a plurality of second grooves are arranged on the second electrode layer in parallel with the first grooves so as to divide the second electrode layer into a plurality of back electrodes corresponding to the bottom electrodes; the second groove penetrates through the back electrode, the second conducting layer, the absorbing layer and the first conducting layer; an invalid power generation region is formed between the adjacent first grooves and the second grooves;

the connecting via hole is arranged between the adjacent first groove and the adjacent second groove, penetrates through the back electrode, the second conducting layer, the absorbing layer and the first conducting layer, and completely covers the non-planar area of the conducting part, so that the contact area between the conducting part and the electrode is increased, the contact resistance is reduced, the current output is improved, and the efficiency of the solar cell module is effectively improved.

In a second aspect, the present application provides an electric device, which includes the solar cell module in the above embodiments.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Moreover, like reference numerals are used to refer to like elements throughout.

In the drawings:

fig. 1 is a schematic cross-sectional view of a solar cell module according to some embodiments of the present disclosure;

FIG. 2 is a schematic top view of a solar cell module according to some embodiments of the present disclosure;

FIG. 3 is a schematic cross-sectional view of another solar cell module according to some embodiments of the present disclosure;

FIG. 4 is a schematic cross-sectional view of a solar cell module according to some embodiments of the present disclosure;

fig. 5 is a schematic cross-sectional view of a solar cell module according to some embodiments of the present disclosure.

The reference numbers in the detailed description are as follows:

the solar cell module 1, the sub-cell 2, the back electrode 21, the bottom electrode 22, the connection via 23, the non-planar region 24, the conductive portion 25, the substrate 3, the first electrode layer 4, the first trench 41, the protrusion 42, the channel 43, the first conductive layer 5, the absorber layer 6, the second conductive layer 7, the second electrode layer 8, the second trench 81, and the first direction a.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: there are three cases of A, A and B, and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, in view of the market situation and the development of social environmental awareness, the solar thin film battery is widely used based on its characteristics of small mass, thin thickness, flexibility, environmental protection, and high conversion rate. The solar thin film battery is not only applied to energy storage power systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to photovoltaic products, military equipment, aerospace and other fields. With the continuous expansion of the application field of the solar thin film cell, the market demand is also continuously expanding.

The present inventors have noted that solar thin film cells occupy an increasing share of the market, for example: perovskite thin film battery, copper indium gallium selenide solar thin film battery, copper zinc tin sulphur solar thin film battery, cadmium telluride solar thin film battery etc. no matter which kind of solar thin film battery, it all includes the multilayer hierarchical structure that stacks gradually the setting to divide into a plurality of fritter through the technique of inline when making solar battery with the battery, thereby promote the voltage or the output current of battery through establishing ties, and then promote battery efficiency. The internal interconnection mode in the existing solar thin film battery is mainly to connect the positive electrode and the negative electrode of the adjacent sub-batteries in series in a scribing mode, the conductivity of the scribing position plays a decisive role in the series resistance of the battery, and the short circuit current and the filling factor of the battery are directly influenced; at present, the two electrode materials are usually in simple physical contact at the scribed line position in the solar thin film cell and are in poor contact, so that the short-circuit current and the filling factor of the solar thin film cell are poor, and the efficiency and the performance of the solar thin film cell are influenced.

In order to solve the problems that the connection in the series connection process in the prior art is too simple, the internal short-circuit current loss of the cell is often caused, the filling factor is poor, and the performance and the efficiency of the solar thin film cell are affected, the applicant researches and finds that the efficiency and the performance of the whole cell can be improved by reducing the contact resistance at the scribed line and increasing the contact current, for example, the contact area of the scribed line and the electrode layer is increased, so that the effect of the contact resistance is reduced.

Based on the above consideration, in order to solve the problems that the connection in the series connection process in the prior art is too simple, the internal short-circuit current loss of the cell is often caused, the filling factor is poor, and the performance and efficiency of the solar thin film cell are affected, the inventor designs a solar cell module 1 through deep research, wherein the solar cell module comprises a plurality of sub-cells 2 which are connected in series in sequence:

a connecting through hole 23 is arranged between the back electrode 21 of the sub-battery 2 and the bottom electrode 22 of the adjacent sub-battery 2, and a non-planar area 24 is arranged at the position of the bottom electrode 22 corresponding to the connecting through hole 23;

the connection via 23 is filled with a conductive part 25 to connect the back electrode 21 and the bottom electrode 22 of the adjacent sub-cell 2, and the conductive part 25 completely covers the non-planar area 24.

In such a solar cell module 1, the back electrode 21 and the bottom electrode 22, i.e. the positive electrode and the negative electrode, of the adjacent sub-cell 2 are connected in series by the connection via 23 and the conductive part 24, and the non-planar region 24 is disposed at the position of the bottom electrode 22 corresponding to the connection via 23, so as to increase the contact area of the conductive part 25 with the bottom electrode 22, thereby reducing the contact resistance and improving the efficiency of the solar cell module 1.

The solar cell module 1 disclosed in the embodiment of the present application can be used in a solar thin film cell, but is not limited to, when a plurality of sub-cells 2 of the solar cell module 1 are connected in series, the contact area between the conductive part 25 and the bottom electrode 22 is increased by the cooperation of the connection via hole 23, the conductive part 25 and the non-planar region 24, so that the contact area is reduced, and the efficiency of the solar cell module 1 is increased. The electric equipment that possesses the solar module 1 disclosed in this application and constitute can be used to and the electrical power generating system who utilizes this electric equipment to constitute, like this, be favorable to solving prior art and connecting too simply at the series connection in-process, often can cause the inside short circuit current loss of battery, lead to its fill factor relatively poor, influence the problem of the performance and the efficiency of solar film battery, can enough guarantee the series connection of subcell 2 in solar module 1, can effectively guarantee the holistic efficiency and the performance of solar module 1 again.

The embodiment of the application provides an electric device using a solar cell module 1 as a power supply, and the electric device can be, but is not limited to, the fields of buildings, military, travel, national defense, power supply and the like, for example: mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, photovoltaic greenhouses, photovoltaic water heaters, and the like.

According to some embodiments of the present application, referring to fig. 1, the present application provides a solar cell module 1 comprising a plurality of sub-cells 2 connected in series in sequence;

a connecting through hole 23 is arranged between the back electrode 21 of the sub-battery 2 and the bottom electrode 22 of the adjacent sub-battery 2, and a non-planar area 24 is arranged at the position of the bottom electrode 22 corresponding to the connecting through hole 23;

the connecting via hole 23 is filled with a conductive part 25 to connect the back electrode 21 and the bottom electrode 22 of the adjacent sub-cell 2, and the conductive part 25 completely covers the non-planar region 24.

Referring to fig. 1 and 2, a solar cell module 1 is a solar thin film cell, and includes a substrate 3, a first electrode layer 4, a first conductive layer 5, an absorption layer 6, a second conductive layer 7, and a second electrode layer 8, which are sequentially stacked;

a plurality of first grooves 41 are arranged on the first electrode layer 4 side by side along the length or width direction of the first electrode layer 4 so as to divide the first electrode layer 4 into a plurality of bottom electrodes 22;

a plurality of second grooves 81 are arranged on the second electrode layer 8 in parallel with the first grooves 41 to divide the second electrode layer 8 into a plurality of back electrodes 21 corresponding to the plurality of bottom electrodes 22; the second trench 81 penetrates the back electrode 21, the second conductive layer 7, the absorption layer 6 and the first conductive layer 5;

the connection via 23 is disposed between the adjacent first trench 41 and the second trench 81, and the connection via 23 penetrates the back electrode 21, the second conductive layer 7, the absorption layer 6, and the first conductive layer 5.

The first electrode layer 4 serves as an integral negative electrode film layer of the solar cell module 1, and the first groove 41 on the first electrode layer divides the integral negative electrode film layer into a plurality of bottom electrodes 22, namely, negative electrode film layers corresponding to the plurality of sub-cells 2; the corresponding second electrode layer 8 is used as the whole anode film layer of the solar cell module 1, and the second grooves 81 thereon divide it into a plurality of back electrodes 21, namely, the positive electrode film layer corresponding to the plurality of sub-cells 2 is divided, and the second trench 81 penetrates the back electrode 21, the second conductive layer 7, the absorption layer 6 and the first conductive layer 5 from top to bottom, so as to divide the back electrode 21, the second conductive layer 7, the absorption layer 6 and the first conductive layer 5 correspondingly to the back electrode 21, so that the substrate 3, the bottom electrode 22, the first conductive layer 5, the absorption layer 6, the second conductive layer 7 and the back electrode 21 corresponding to the upper right and lower parts form a complete sub-cell 2, the arrangement manner can be easily understood and implemented by those skilled in the art, and both the first trench 41 and the second trench 81 can be implemented by laser scribing and etching, which is not described herein in detail. There is no communication between adjacent levels within each trench and connecting via 23, and this arrangement is readily understood and implemented by those skilled in the art and will not be described in any greater detail herein. The extending direction of the first trench 41 and the second trench 81 may be the longitudinal direction or the width direction of the substrate 3, and when the trenches are arranged along the width direction, the output voltage of the solar cell module 1 is high, and when the trenches are arranged along the length direction, the output current of the solar cell module 1 is high.

The absorption layer 6 is arranged between the back electrode 21 and the bottom electrode 22, firstly absorbs photons to generate electron-hole pairs when being illuminated, and is matched with the first conductive layer 5 and the second conductive layer 7 to transmit carriers between the back electrode 21 and the bottom electrode 22; for example: the absorber layer 6 corresponding to the perovskite solar cell may be a perovskite type organic metal halide semiconductor.

Wherein the substrate 3 is a rigid or flexible glass substrate.

The connecting via 23 is a via or a trench disposed between the adjacent first trench 41 and the second trench 81, the connecting via 23 is disposed to form a connecting channel between the back electrode 21 and the bottom electrode 22 of the adjacent sub-battery 2, and the connecting via 23 needs to penetrate through the back electrode 21, the second conductive layer 7, the absorption layer 6 and the first conductive layer 5; specifically, in the manufacturing process, after the second conductive layer 7 is manufactured, the connection via 23 is manufactured, for example: by etching, and then the back electrode 21 or the second electrode layer 8 is disposed.

The non-planar region 24 is to set the position of the bottom electrode 22 corresponding to the connection via 23 in a non-planar form for the purpose of increasing the contact area, for example: protrusions, grooves, corrugations, etc. may be provided at this location, as long as they are not simply the planar surface of the bottom electrode 22. The non-planar region 24 may be formed by etching after the bottom electrode 22 or the first electrode layer 4 is prepared, or may be formed by processing the conductive portion 25 at the connection via 23 with laser after the conductive portion 25 is disposed, and applying a potential to the conductive portion 25 by using laser pulse energy to diffuse the back electrode 22 onto the bottom electrode 22 under the action of laser, so as to form a portion protruding into the bottom electrode 22, so as to increase the contact area, for example: selecting a laser beam with the pulse energy of 0.1 muJ-0.3 muJ and the moving speed of 500-800 mm/s.

In the present embodiment, the conductive portion 25 may be made of the same material as the back electrode 21 or the second electrode layer 8, that is, the conductive portion 25 may be formed simultaneously during the process of manufacturing the second electrode layer 8, so that the process is simplified and the contact resistance between the second electrode layer 8 or the back electrode 21 and the conductive portion 25 is reduced.

When the plurality of sub-cells 2 of the solar cell module 1 are connected in series, the contact area between the conductive part 25 and the bottom electrode 22 is increased by the cooperation of the connection via 23, the conductive part 25 and the non-planar region 24, so that the contact area is reduced and the efficiency of the solar cell module 1 is increased. The electric equipment that possesses the solar module 1 disclosed in this application and constitute can be used to and the electrical power generating system who utilizes this electric equipment to constitute, like this, be favorable to solving prior art and connecting too simply at the series connection in-process, often can cause the inside short circuit current loss of battery, lead to its fill factor relatively poor, influence the problem of the performance and the efficiency of solar film battery, can enough guarantee the series connection of subcell 2 in solar module 1, can effectively guarantee the holistic efficiency and the performance of solar module 1 again.

According to some embodiments of the present application, optionally, with reference to fig. 3, the non-planar area 24 covers at least a part of the open end of the connecting via 23 towards an orthographic projection of the connecting via 23.

In order to effectively increase the contact area between the conductive portion 23 and the bottom electrode 22, the non-planar region 24 is set such that the orthographic projection of the non-planar region 24 facing the connecting via 23 at least covers part of the open end of the connecting via 23, i.e. the projection from bottom to top in fig. 3, the non-planar region 24 can increase the contact area as long as covering part of the opening of the connecting via 23, of course, the larger the range of the projection of the non-planar region 24 covering the opening of the connecting via 23, the larger the effect of increasing the contact area, and even the projection of the non-planar region 24 exceeds the range of the opening of the connecting via 23, besides the connecting via 23 is connected to the bottom electrode 22, the non-planar region can be connected to the bottom electrode 22 beyond the range of the opening of the connecting via 23, so that the contact area is greatly increased, which is of great benefit to the improvement of the efficiency of the solar cell module 1.

According to some embodiments of the present application, optionally, with reference to fig. 3, the non-planar area comprises a groove;

the groove extends from the surface of the bottom electrode to the inside of the bottom electrode along the thickness direction of the bottom electrode, and the opening of the groove faces the back electrode.

This arrangement enables the conductive portion 25 to fill the recess and make contact with the bottom electrode 22 on all inner surfaces of the recess, thereby effectively increasing the contact area. The shape of the groove may be any shape, for example: regular rectangular grooves, semicircular grooves, or irregular grooves on the side of the base electrode, as long as the grooves extend from the surface of the base electrode 22 to the inside thereof to a certain depth.

According to some embodiments of the present application, the depth of the recess is less than the thickness of the bottom electrode 22.

The thickness of the bottom electrode 22 in the sub-cell 2 or the solar cell module 1 is usually set to be 500nm to 600nm, and further, the depth of the groove is set to be smaller than the thickness of the bottom electrode 22 in the embodiment, for example: 10nm-500nm, and further ensuring the integrity of the bottom electrode on the premise of increasing the contact area of the conductive part 25 and the bottom electrode 22.

According to some embodiments of the present application, optionally, with reference to fig. 1, a dimension of the groove along the first direction a is less than or equal to a dimension of the connecting via 23 along the first direction a;

wherein the first direction a is the direction in which a sub-cell 2 points towards its neighboring sub-cell 2.

In the design of the solar thin film cell, the connecting via 23 is usually disposed in the inactive power generation region of the adjacent sub-cell 2, and it is further required to ensure that the range of the inactive power generation region is as small as possible, so as to increase the output efficiency of the solar cell module 1, that is, to ensure that the distance between the first trench 21 and the second trench 81 adjacent to the first trench is small, so on the premise that the contact area can be increased, in the present embodiment, the size of the groove in the first direction a (i.e., the horizontal direction in the figure, that is, the width of the groove) is set to be less than or equal to the size of the connecting via 23, that is, the size of the groove varies with the size of the connecting via 23, and the design is performed on the basis of the general design size of the existing connecting via, that is, a scribe line P2, for example: 10um-150um, realize reducing contact resistance on the basis of not expanding the invalid power generation district, improve solar module 1's overall efficiency.

According to some embodiments of the present application, referring to fig. 3, the groove bottom of the groove is arc-shaped.

The groove bottom of the groove, namely the edge of the lowest side in the bottom electrode 22 is arranged to be arc-shaped, so that the contact area is effectively increased.

On the premise that the groove bottom of the groove is in an arc shape, in this embodiment, the arc shape may be set to completely correspond to the opening of the connection via 23 as shown in fig. 1, or the arc shape may be set to be smaller as shown in fig. 3, which does not completely correspond to the opening of the connection via 23.

According to some embodiments of the present application, optionally, with reference to fig. 4 and 5, the bottom of the groove has a plurality of protrusions 42; or

The bottom of the groove has several channels 43 arranged side by side or staggered.

The groove bottom is provided in the form of a plurality of protrusions 42 as shown in fig. 4 so that the groove bottom has an uneven surface, thereby increasing the contact area between the conductive portion 25 and the groove bottom, i.e., the bottom electrode 22.

The groove bottom can also be provided in the form of a groove 43 as shown in fig. 5, so that the groove bottom is staggered in depth, and the contact area between the conductive part 25 and the groove bottom, i.e., the bottom electrode 22, is greatly increased.

According to some embodiments of the present application, the conductive portion 25 and the back electrode 21 are optionally made of the same material.

The arrangement mode enables the conductive part 25 to be synchronously formed in the manufacturing process of the second electrode layer 8, the manufacturing process can be simplified, meanwhile, the second electrode layer 8 or the back electrode 21 and the conductive part 25 are integrally formed, no contact point exists, the contact resistance is extremely low, and great benefits are provided for reducing the efficiency loss of the solar cell module 1 and improving the efficiency and performance of the solar cell module 1.

According to some embodiments of the present application, referring to fig. 1, the present application provides a solar cell module 1, wherein the connection between the back electrode 21 and the bottom electrode 22 of the adjacent sub-cell 2 is achieved through the cooperation of the connecting via 23 and the conductive portion 25, and the conductive portion 25 can be filled in the groove by completely filling the groove when being filled in the connecting via 23 by arranging the groove on the bottom electrode 22 corresponding to the connecting via 23 and sinking toward the inside of the bottom electrode 22, so as to increase the contact area with the bottom electrode 22, reduce the contact resistance, and improve the efficiency of the solar cell module 1.

According to some embodiments of the present application, there is provided an electric device including the solar cell module 1 in the above embodiments, wherein the solar cell module 1 is used for providing electric energy.

The electric equipment can be, but is not limited to, the fields of construction, military, travel, national defense, power supply and the like, such as: mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, photovoltaic greenhouses, photovoltaic water heaters, and the like.

The solar cell module 1 in the electric equipment is matched with the back electrode 21 and the bottom electrode 22, namely the positive electrode and the negative electrode, of the adjacent sub-cell 2 in series through the connecting through hole 23 and the conducting part 24, and the non-planar area 24 is arranged at the position, corresponding to the connecting through hole 23, of the bottom electrode 22, so that the contact area of the conducting part 25 and the bottom electrode 22 is increased, the contact resistance is reduced, and the efficiency of the solar cell module 1 is improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (10)

1. The utility model provides a solar module, its includes a plurality of subcells of establishing ties in proper order which characterized in that:

a connecting through hole is formed between the back electrode of each sub-battery and the bottom electrode of the adjacent sub-battery, and a non-planar area is formed in the position, corresponding to the connecting through hole, of each bottom electrode;

the connecting through hole is filled with a conductive part to connect the back electrode and the bottom electrode of the adjacent sub-battery, and the conductive part completely covers the non-planar area.

2. The solar cell assembly according to claim 1 wherein an orthographic projection of the non-planar region toward the connecting via covers at least a portion of an open end of the connecting via.

3. The solar cell assembly of claim 1 or 2, wherein the non-planar region comprises a groove;

the groove extends from the surface of the bottom electrode to the inside of the bottom electrode along the thickness direction of the bottom electrode, and the opening of the groove faces the back electrode.

4. The solar cell assembly of claim 3 wherein the depth of the recess is less than the thickness of the bottom electrode.

5. The solar cell module as claimed in claim 3, wherein a dimension of the groove in a first direction is less than or equal to a dimension of the connection via in the first direction;

wherein the first direction is a direction in which the sub-cell points to its neighboring sub-cell.

6. The solar cell module of claim 3 wherein the groove bottom of the groove is arcuate.

7. The solar cell module as claimed in claim 3, wherein the groove bottom of the groove has a plurality of protrusions; or

The groove bottom of the groove is provided with a plurality of channels which are arranged side by side or staggered.

8. The solar cell module of claim 1, wherein the conductive portion and the back electrode are of the same material.

9. The solar cell module according to claim 1, comprising a substrate, a first electrode layer, a first conductive layer, an absorption layer, a second conductive layer, and a second electrode layer, which are sequentially stacked;

a plurality of first grooves are arranged on the first electrode layer side by side along the length or width direction of the first electrode layer so as to divide the first electrode layer into a plurality of bottom electrodes;

a plurality of second grooves are formed in the second electrode layer in parallel with the first grooves so as to divide the second electrode layer into a plurality of back electrodes corresponding to the bottom electrodes; the second groove penetrates through the back electrode, the second conducting layer, the absorption layer and the first conducting layer;

the connecting via hole is arranged between the adjacent first groove and the second groove and penetrates through the back electrode, the second conducting layer, the absorption layer and the first conducting layer.

10. An electrical consumer, comprising: the solar module of any one of claims 1-9.

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