A battery assembly

Abstract

An embodiment of the present application provides a battery assembly. The battery assembly includes at least one group of battery strings, and the battery string specifically includes: multiple batteries, a conductive tape, and an insulating adhesive layer; wherein the battery includes a battery body and an electrode connected to the battery body; the conductive tape is respectively connected to the electrodes of the multiple batteries; the insulating adhesive layer is respectively bonded to the conductive tape and the battery body. The battery string of the present application can avoid the phenomenon of battery warping. In this way, it is not only conducive to the subsequent lamination operation of the battery string, but also improves the appearance accuracy of the battery assembly obtained by lamination. Moreover, it can also improve the mechanical load resistance and thermal shock resistance of the battery assembly, avoid the defects of battery cracks during the lamination process, and improve the yield rate of the battery assembly.

Description

Technical Field

[0001] The present application belongs to the field of photovoltaic processing technology, and specifically relates to a battery assembly. Background Art

[0002] Clean energy is one of the effective ways to solve the problems of energy shortage and environmental pollution, and photovoltaic power generation, as an important part of clean energy, has always attracted much attention. As the main body of photovoltaic power generation, solar cell modules usually need to use welding ribbons to weld multiple cells together to form a battery string, and then laminate the battery strings to form a battery module.

[0003] In the prior art, during the processing of the battery string, due to the different thermal expansion coefficients between the battery and the welding ribbon, after the welding is completed, the battery is easily warped due to the shrinkage of the welding ribbon pulling the battery. The warping of the battery will not only increase the difficulty of subsequent lamination, but also cause the poor appearance of the battery assembly. In addition, it will also reduce the battery assembly's ability to resist mechanical loads and cold and hot shocks. It can even cause defects such as battery cell splitting during the lamination process, increasing the defective rate of the battery assembly. Utility Model Content

[0004] The present application aims to provide a battery assembly to solve the problem that existing battery strings are prone to warping during welding.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The present application discloses a battery assembly, including at least one battery string, wherein the battery string includes: a plurality of batteries, a conductive tape and an insulating adhesive layer; wherein:

[0007] The battery comprises a battery body and electrodes connected to the battery body;

[0008] The conductive tapes are respectively connected to the electrodes of the plurality of batteries;

[0009] The insulating adhesive layer is respectively bonded and connected to the conductive tape and the battery body.

[0010] Optionally, the battery is further provided with a conductive adhesive portion, and the conductive adhesive portion is provided on a side of the electrode away from the battery body; wherein,

[0011] The conductive tape is connected to the conductive adhesive portion.

[0012] Optionally, the electrode is a grid line;

[0013] The conductive adhesive portion covers the gate line along the length direction of the gate line;

[0014] Alternatively, the conductive adhesive portion includes a plurality of sub-adhesive portions, and the plurality of sub-adhesive portions are arranged at intervals along the length direction of the gate line.

[0015] Optionally, the electrode comprises: a plurality of positive electrode fine grid lines and a plurality of negative electrode fine grid lines extending along a first direction, and a positive electrode main grid line and a negative electrode main grid line extending along a second direction; wherein,

[0016] A plurality of positive electrode fine grid lines and a plurality of negative electrode fine grid lines are arranged crosswise along a second direction, the second direction is perpendicular to the first direction, the positive electrode main grid lines are electrically connected to the plurality of positive electrode fine grid lines respectively, and the negative electrode main grid lines are electrically connected to the plurality of negative electrode fine grid lines respectively;

[0017] The conductive adhesive portion is disposed on the positive electrode busbar and the negative electrode busbar, and the conductive tape is electrically connected to the conductive adhesive portion on the positive electrode busbar or the negative electrode busbar.

[0018] Optionally, a first insulating portion is provided at a position on the positive electrode fine grid line corresponding to the negative electrode main grid line, and at a position on the negative electrode fine grid line corresponding to the positive electrode main grid line;

[0019] The width of the first insulating portion along the first direction is a first width, the width of the positive electrode busbar and the negative electrode busbar along the first direction is a second width, and the first width is greater than or equal to the second width.

[0020] Optionally, the electrode includes a plurality of positive electrode fine grid lines and a plurality of negative electrode fine grid lines extending along a first direction, and the plurality of positive electrode fine grid lines and the plurality of negative electrode fine grid lines are arranged crosswise along a second direction, and the second direction is perpendicular to the first direction; wherein,

[0021] The conductive adhesive portion is disposed on the positive electrode fine grid line and the negative electrode fine grid line.

[0022] Optionally, a cross-distributed second insulating portion is provided on the positive electrode fine grid line and the negative electrode fine grid line.

[0023] Optionally, the material of the conductive bonding portion includes at least one of solder paste, conductive glue, silver paste, and copper paste.

[0024] Optionally, the width of the insulating rubber layer is greater than the width of the conductive tape;

[0025] The insulating adhesive layer covers the conductive tape in its entirety along the length direction of the conductive tape, or the insulating adhesive layer covers the conductive tape in sections along the length direction of the conductive tape.

[0026] Optionally, the battery assembly comprises: a packaging layer connected to both sides of the battery string, and a width of the packaging layer is greater than a width of the battery string.

[0027] In the embodiment of the present application, the battery string can use an insulating adhesive layer to adhere the conductive tape to the battery to avoid welding the conductive tape to the battery, thereby preventing the battery from warping. This is not only conducive to the subsequent lamination operation of the battery string and improving the appearance accuracy of the battery assembly obtained by lamination, but also can improve the mechanical load resistance and thermal shock resistance of the battery assembly, avoid the defect of battery splitting during the lamination process, and improve the yield rate of the battery assembly.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of the structure of a photovoltaic string at a certain angle in a photovoltaic module according to an embodiment of the present application;

[0031] Figure 2 yes Figure 1 The schematic diagram of the structure of the photovoltaic string from another angle is shown;

[0032] Figure 3 yes Figure 1 A schematic diagram of the structure of the batteries in the battery string;

[0033] Figure 4 yes Figure 3 A schematic cross-sectional structure diagram of an AA cross section of a battery shown;

[0034] Figure 5 is a schematic diagram of the structure of another photovoltaic string at a certain angle described in an embodiment of the present application;

[0035] Figure 6 yes Figure 5 The schematic diagram of the structure of the photovoltaic string from another angle is shown;

[0036] Figure 7 yes Figure 5 A schematic diagram of the structure of the batteries in the battery string;

[0037] Figure 8 yes Figure 7 Schematic diagram of the cross-sectional structure of the BB section of the battery shown.

[0038] Figure numerals: 10 - battery, 101 - battery body, 102 - electrode, 1021 - positive electrode fine grid line, 1022 - negative electrode fine grid line, 1023 - positive electrode main grid line, 1024 - negative electrode main grid line, 103 - conductive bonding part, 104 - first insulating part, 105 - second insulating part, 11 - conductive tape, 12 - insulating glue layer, x - first direction, y - second direction. DETAILED DESCRIPTION

[0039] The embodiments of the utility model will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0040] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Reference Figure 1 , showing a schematic cross-sectional structure diagram of a photovoltaic string in a photovoltaic module according to an embodiment of the present application at a certain angle, referring to Figure 2 , showing Figure 1 The schematic diagram of the photovoltaic string from another angle is shown in Figure 1. Figure 3 , showing Figure 1 The schematic diagram of the structure of the battery in the battery string is shown in FIG. Figure 4 , showing Figure 3 A schematic diagram of the cross-sectional structure of an AA section of a battery is shown.

[0044] The photovoltaic assembly described in the embodiment of the present application includes at least one set of photovoltaic strings, such as Figure 1 , Figure 2 As shown, the battery string may specifically include: a plurality of batteries 10, a conductive tape 11, and an insulating adhesive layer 12. The battery 10 may include a battery body 101 and an electrode 102 connected to the battery body 101; the conductive tape 11 is respectively connected to the electrodes 102 of the plurality of batteries 10 to achieve electrical connection between the plurality of batteries 10; the insulating adhesive layer 12 is respectively bonded to the conductive tape 11 and the battery 10 to connect the conductive tape 11 and the plurality of batteries 10 to form a whole, thereby obtaining a battery string.

[0045] In the embodiment of the present application, the battery string can use an insulating adhesive layer 12 to bond the conductive tape 11 to the battery 10 to avoid welding the conductive tape 11 to the battery 10, thereby avoiding the warping of the battery 10. This is not only conducive to the subsequent lamination operation of the battery string and improves the appearance accuracy of the battery assembly obtained by lamination, but also can improve the mechanical load resistance and thermal shock resistance of the battery assembly, avoid the defect of battery cracking during the lamination process, and improve the yield rate of the battery assembly.

[0046] Specifically, the battery 10 may include any one of a back contact battery, a heterojunction battery, a TOPCON battery and a PERC battery. The embodiments of the present application only take the back contact battery as an example for illustration, and other types of batteries can be implemented by reference. A back contact battery is a battery in which both the emitter and base contact electrodes are placed on the back side (non-light-receiving side) of the battery. The light-receiving side of the battery is not blocked by any metal electrode, thereby effectively increasing the short-circuit current of the battery. At the same time, the back side can allow wider metal grid lines to reduce the series resistance and thus improve the fill factor; and this battery with no obstruction on the front side not only has high conversion efficiency, but also looks more beautiful. At the same time, the components of the back contact battery are easier to assemble. Since the electrodes of the back contact battery are all arranged on the back side, during the series connection of the battery, only one-sided welding is performed on the back side of the battery, and the phenomenon of unilateral warping of the battery is more serious. The technical solution described in the embodiments of the present application is applied to the series connection of the back contact battery, and the improvement effect on the battery warping phenomenon is more significant.

[0047] In the embodiment of the present application, the number of batteries 10 can be greater than or equal to 2. Before connecting the batteries 10, the batteries 10 can be arranged according to the design of the battery assembly, and the conductive tapes 11 can be distributed and placed on the electrodes 102 of the above-mentioned batteries 10. Then, the conductive tapes 11 are firmly adhered to the surface of the batteries 10 through the insulating adhesive layer 12 to achieve interconnection between the batteries 10 and form a battery string. That is, the technical solution described in the embodiment of the present application completes the interconnection between the batteries 10 at room temperature to obtain a battery string.

[0048] For example, the conductive tape 11 may be a single metal, such as copper, aluminum, or other metals with good electrical conductivity and no solder layer. Alternatively, the conductive tape 11 may be made of a metal having a solder layer and a protective layer, such as a tin-plated copper tape, a tin-silver alloy copper tape, a tin-bismuth alloy copper tape, a tin-lead alloy copper tape, a tin-lead-bismuth alloy copper tape, a tin-lead-bismuth-silver alloy copper tape, etc. The present embodiment of the application does not specifically limit the material of the conductive tape 11.

[0049] Specifically, the insulating adhesive layer 12 has insulating properties, and the bonding force between the insulating adhesive layer 12 and the battery 10 is greater than or equal to 0.1N / mm. The width of the insulating adhesive layer 12 can be greater than the width of the conductive tape 11, forming a Figure 1 The conductive tape 11 is reliably bonded to the battery 10 by the bonding and fixing surface. The insulating adhesive layer 12 can be any adhesive tape with insulating properties and a temperature resistance greater than 100°C.

[0050] In some optional embodiments of the present application, the insulating adhesive layer 12 may cover the conductive tape 11 as a whole along the length direction of the conductive tape 11, that is, the insulating adhesive layer 12 covers the entire conductive tape 11 to reliably adhere the conductive tape 11 to the battery 10. Alternatively, the insulating adhesive layer 12 covers the conductive tape 11 in sections along the length direction of the conductive tape 11 to reduce the amount of the insulating adhesive layer 12. The embodiment of the present application does not specifically limit the way in which the insulating adhesive layer 12 covers the conductive tape 11.

[0051] like Figure 1 and Figure 2 As shown, the battery 10 is also provided with a conductive adhesive portion 103, which is provided on a side of the electrode 102 away from the battery body 101; wherein the conductive tape 11 is connected to the conductive adhesive portion 103. In the subsequent process of laminating the battery string to obtain a battery assembly, the conductive adhesive portion 103 can be melted at a high temperature, and the electrode 102 of the battery 10 and the conductive tape 11 are tightly connected together to form an ohmic contact, which is conducive to the input and output of current between the conductive tape 11 and the battery 10.

[0052] In actual application, before the battery string is laminated, the conductive tape 11 and the conductive adhesive portion 103 are only in contact, and there is no bonding force between the two. The conductive tape 11 and the battery 10 are bonded together by the insulating adhesive layer 12, which can not only tightly fit the conductive tape 11 and the conductive adhesive portion 103 together to prevent the conductive tape 11 from shifting, but also prevent the conductive tape 11 from shifting due to the flow of the adhesive film during the lamination process, which affects the contact between the conductive tape 11 and the conductive adhesive portion 103.

[0053] For example, the material of the conductive adhesive portion 103 includes at least one of conductive adhesives such as solder paste, conductive glue, silver paste, and copper paste. The material of the conductive adhesive portion 103 may not be specifically limited in the embodiment of the present application. The melting / reaction / welding temperature of the conductive adhesive portion 103 may be 100 to 200°C, so that the conductive adhesive portion 103 can be melted within the lamination temperature range of the battery string to achieve ohmic contact between the battery electrode 102 and the conductive tape 11. The conductive adhesive can be produced on the electrode 102 of the battery 10 by screen printing, dispensing, coating, etc., and then dried in a drying furnace at 100 to 200°C.

[0054] Optionally, the electrode 102 is a gate line; the conductive adhesive portion 103 covers the gate line along the length direction of the gate line, so that during the lamination process of the battery string, the gate line can form an ohmic contact with the conductive tape 11 through the conductive adhesive portion 103, greatly improving the connection reliability between the gate line and the conductive tape 11.

[0055] Alternatively, the conductive adhesive portion 103 may include a plurality of sub-adhesive portions, which are spaced apart along the length direction of the gate line. During the lamination process of the battery string, each of the sub-adhesive portions may be melted to form a connection point between the gate line and the conductive tape 11. A plurality of sub-adhesive portions may form a plurality of connection points, which can achieve a reliable connection between the gate line and the conductive tape 11 and reduce the material usage of the conductive adhesive portion 103.

[0056] In a specific application, when the conductive tape 11 is electrically connected to the gate line through multiple sub-adhesive parts, the insulating adhesive layer 12 can cover the conductive tape 11 as a whole, or it can be fixed only at the position where there is a conductive adhesive, i.e., the sub-adhesive part. This embodiment of the application does not limit this.

[0057] like Figure 3 As shown, the electrode 102 may include: a plurality of positive fine grid lines 1021 and a plurality of negative fine grid lines 1022 extending along a first direction x, and a positive main grid line 1023 and a negative main grid line 1024 extending along a second direction y; wherein, the plurality of positive fine grid lines 1021 and the plurality of negative fine grid lines 1022 are cross-arranged along the second direction y, the second direction y is perpendicular to the first direction x, the positive main grid lines 1023 are electrically connected to the plurality of positive fine grid lines 1021, respectively, and the negative main grid lines 1024 are electrically connected to the plurality of negative fine grid lines 1022, respectively.

[0058] In specific applications, the positive electrode fine grid lines 1021 and the negative electrode fine grid lines 1022 can be used to collect current. Among the materials of the positive electrode fine grid lines 1021 and the negative electrode fine grid lines 1022, more than 30% of the materials can be conductive metals or conductive alloys. In practical applications, the positive electrode fine grid lines 1021 and the negative electrode fine grid lines 1022 can be formed on the battery body 101 by screen printing, electroplating, evaporation, laser, 3D printing and other processes.

[0059] like Figure 3 As shown, the first insulating portion 104 is provided at the position on the positive electrode fine grid line 1021 corresponding to the negative electrode main grid line 1024, and at the position on the negative electrode fine grid line 1022 corresponding to the positive electrode main grid line 1023. The first insulating portion 104 can achieve insulation between the positive electrode fine grid line 1021 and the negative electrode main grid line 1024, and between the negative electrode fine grid line 1022 and the positive electrode main grid line 1023. By providing the first insulating portion 104, the interruption of the positive electrode fine grid line 1021 at the position corresponding to the negative electrode main grid line 1024 can be avoided, and the interruption of the negative electrode fine grid line 1022 at the position corresponding to the positive electrode main grid line 1023 can be avoided, so as to improve the current collection efficiency of the positive electrode fine grid line 1021 and the negative electrode fine grid line 1022.

[0060] Specifically, the first insulating portion 104 may be formed by printing, imprinting, gluing, thermosetting, photosetting, etc., and the present application does not specifically limit the formation method of the first insulating portion 104 .

[0061] Positive main grid lines 1023 and negative main grid lines 1024 are distributed in a direction perpendicular to the positive fine grid lines 1021 and the negative fine grid lines 1022, wherein the positive main grid lines 1023 are electrically connected to all the positive fine grid lines 1021 to further collect the current collected by the positive fine grid lines 1021. The negative main grid lines 1024 are connected to all the negative fine grid lines 1022 to collect the current collected by the negative fine grid lines 1022. More than 30% of the materials of the positive main grid lines 1023 and the negative main grid lines 1024 can be conductive metals or conductive alloys. In practical applications, the positive main grid lines 1023 and the negative main grid lines 1024 can be formed on the first insulating portion 104 by screen printing, electroplating, evaporation, laser, 3D printing, etc. The number of the positive electrode main grid line 1023 and the number of the negative electrode main grid line 1024 are at least one each, so as to further collect the current collected by the positive electrode fine grid line 1021 and the negative electrode fine grid line 1022 respectively.

[0062] like Figure 4 As shown, the conductive adhesive portion 103 is disposed on the positive electrode busbar 1023 and the negative electrode busbar 1024 (not shown in the figure). Figure 1 and Figure 2 As shown, the conductive tape 11 is electrically connected to the conductive adhesive portion 103 on the positive electrode busbar 1023 or the negative electrode busbar 1024 (not shown in the figure). In this way, during the lamination process of the battery string, the conductive tape 11 can achieve ohmic contact with the positive electrode busbar 1023 or the negative electrode busbar 1024 (not shown in the figure) through the conductive adhesive portion 103.

[0063] It should be noted that Figure 4 Only the conductive bonding portion 103 is provided on the positive busbar 1023. Figure 1 and Figure 2 Only the case where the conductive tape 11 is connected to the positive electrode busbar 1023 through the conductive adhesive portion 103 is shown. In actual applications, the case where the conductive adhesive portion 103 is provided on the negative electrode busbar 1024 and the conductive tape 11 is connected to the negative electrode busbar 1024 through the conductive adhesive portion 103 can be referred to for implementation.

[0064] like Figure 3As shown, the width of the first insulating portion 104 along the first direction x is a first width L1, and the width of the positive main grid line 1023 and the negative main grid line 1024 along the first direction x is a second width W2, and the first width L1 is greater than or equal to the second width W2, so that the first insulating portion 104 can achieve reliable insulation between the positive main grid line 1023 and the negative fine grid line 1022, and reliable insulation between the negative main grid line 1024 and the positive fine grid line 1021.

[0065] Reference Figure 5 , showing a schematic diagram of the structure of another photovoltaic string at a certain angle according to an embodiment of the present application, referring to Figure 6 , showing Figure 5 The schematic diagram of the photovoltaic string from another angle is shown in Figure 1. Figure 7 , showing Figure 5 The schematic diagram of the structure of the battery in the battery string is shown in FIG. Figure 8 , showing Figure 7 Schematic diagram of the cross-sectional structure of the BB section of the battery shown.

[0066] like Figure 7 As shown, the electrode 102 includes a plurality of positive electrode fine grid lines 1021 and a plurality of negative electrode fine grid lines 1022 extending along a first direction x, and the plurality of positive electrode fine grid lines 1021 and the plurality of negative electrode fine grid lines 1022 are arranged to cross along a second direction y, and the second direction y is perpendicular to the first direction x. Figure 8 As shown, the conductive bonding portion 103 is disposed on the positive electrode fine grid line 1021 and the negative electrode fine grid line 1022. Figure 1 and Figure 2 As shown, the conductive tape 11 can be connected to the conductive adhesive portion 103 on the positive electrode fine grid line 1021 or the negative electrode fine grid line 1022 (not shown in the figure). In this way, during the lamination process of the battery string, the conductive tape 11 can achieve ohmic contact with the positive electrode fine grid line 1021 or the negative electrode fine grid line 1022 (not shown in the figure) through the conductive adhesive portion 103.

[0067] In practical applications, Figures 5 to 8 The battery 10 shown is arranged without a main grid, thereby reducing the efficiency loss of the battery 10 caused by the main grid arrangement and improving the overall power of the battery assembly.

[0068] It should be noted that Figure 8 FIG. 1 shows only that the conductive bonding portion 103 is provided on the positive electrode fine grid line 1021. Accordingly, Figure 5 and Figure 6Only the case where the conductive tape 11 is connected to the positive electrode fine grid line 1021 through the conductive adhesive portion 103 is shown. In actual application, the case where the conductive adhesive portion 103 is provided on the negative electrode fine grid line 1022 and the conductive tape 11 is connected to the negative electrode fine grid line 1022 through the conductive adhesive portion 103 can be referred to for implementation.

[0069] Specifically, the materials and the forming methods of the positive electrode fine grid lines 1021 , the negative electrode fine grid lines 1022 and the conductive adhesive portion 103 may refer to the aforementioned embodiments, and will not be elaborated herein.

[0070] like Figure 7 As shown, a cross-distributed second insulating portion 105 is provided on the positive electrode fine grid line 1021 and the negative electrode fine grid line 1022. In a specific application, when the conductive tape 11 is fitted and connected with the conductive adhesive portion 103 on the positive electrode fine grid line 1021 in the same battery 10, it is necessary to set the second insulating portion 105 at a position corresponding to the conductive tape 11 on the negative electrode fine grid line 1022 to achieve insulation between the negative electrode fine grid line 1022 and the conductive tape 11, so as to avoid a short circuit in the battery 10. Similarly, when the conductive tape 11 is fitted and connected with the conductive adhesive portion 103 on the negative electrode fine grid line 1022 in the same battery 10, it is necessary to set the second insulating portion 105 at a position corresponding to the conductive tape 11 on the positive electrode fine grid line 1021 to achieve insulation between the positive electrode fine grid line 1021 and the conductive tape 11, so as to avoid a short circuit in the battery 10.

[0071] It should be noted that the material and formation method of the second insulating portion 105 may refer to the first insulating portion 104 , and will not be elaborated herein.

[0072] In the embodiment of the present application, since the battery string avoids the operation of welding the conductive tape 11 to the battery 10 during the process of interconnecting the batteries 10, the design of the welding Pad point on the battery 10 can be eliminated, effectively avoiding the efficiency loss of the battery 10 caused by the Pad point, and the efficiency of the battery 10 is improved by 0.3% to 0.5%.

[0073] In specific applications, a conventional conductive tape 11 welding scheme is adopted, and the warping of the battery 10 after welding is completed is greater than 2.5 mm. The battery string of this scheme is fixed by a simple insulating glue layer 12, and the battery 10 is interconnected at room temperature, without any warping other than the warping of the battery 10 itself, avoiding the warping, fragmentation, and short circuit problems caused by existing thermal welding. Moreover, by adopting a first insulating part 104 in the battery 10 to achieve insulation between different electrodes 102, and adopting a second insulating part 105 to achieve insulation between the electrode 102 and the conductive tape 11, the cost increase, product reliability risk, and expensive equipment investment caused by the introduction of special glue films in traditional coating and dispensing schemes can be avoided. In addition, after the battery string is fixed by the insulating glue layer 12, the battery string has good EL (electroluminescence) imaging in front of the layer, which can effectively avoid the quality control caused by the EL shadow in front of the layer in the dispensing and coating schemes.

[0074] Specifically, the battery assembly may include a packaging layer connected to both sides of the battery string, and the width of the packaging layer may be greater than the width of the battery string to achieve reliable packaging of the battery string.

[0075] In practical applications, the battery string fixed firmly with the insulating tape is stacked. The stacking is: first packaging material + first packaging film + battery string + second packaging film + second packaging material, which is combined into a battery assembly and put into a laminator for lamination process, with a lamination temperature of <170°C. After lamination, the conductive tape, the conductive adhesive part, and the battery electrode are in good contact, achieving good electrical connection.

[0076] In the embodiment of the present application, the electrical connection between the conductive tape 11 and the electrode 102 of the battery 10 is formed in the lamination stage. The long lamination process allows the conductive adhesive portion 103 to fully contact with the conductive tape 11 and the electrode 102 of the battery 10, forming good contact, uniform force, reducing the internal stress of the battery 10, and the welding tension is greater than the same type of thermal welding tension by more than 0.3N; at the same time, the performance requirements of the insulating adhesive layer 12 are relatively low and very easy to achieve, while ensuring product reliability.

[0077] In summary, the photovoltaic string described in the embodiment of the present application can at least include the following advantages:

[0078] In the embodiment of the present application, the battery string can use an insulating adhesive layer to adhere the conductive tape to the battery to avoid welding the conductive tape to the battery, thereby preventing the battery from warping. This is not only conducive to the subsequent lamination operation of the battery string and improving the appearance accuracy of the battery assembly obtained by lamination, but also can improve the mechanical load resistance and thermal shock resistance of the battery assembly, avoid the defect of battery splitting during the lamination process, and improve the yield rate of the battery assembly.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery assembly, characterized in that: It comprises at least one battery string, wherein the battery string comprises: a plurality of batteries, a conductive tape and an insulating adhesive layer; wherein, The battery comprises a battery body and electrodes connected to the battery body; The conductive tapes are respectively connected to the electrodes of the plurality of batteries; The insulating adhesive layer is respectively bonded and connected to the conductive tape and the battery body.

2. The battery assembly according to claim 1, characterized in that: The battery is also provided with a conductive adhesive portion, which is provided on a side of the electrode away from the battery body; wherein, The conductive tape is connected to the conductive adhesive portion.

3. The battery assembly according to claim 2, characterized in that: The electrodes are grid lines; The conductive adhesive portion covers the gate line along the length direction of the gate line; Alternatively, the conductive adhesive portion includes a plurality of sub-adhesive portions, and the plurality of sub-adhesive portions are arranged at intervals along the length direction of the gate line.

4. The battery assembly according to claim 2, characterized in that: The electrodes include: a plurality of positive electrode fine grid lines and a plurality of negative electrode fine grid lines extending along a first direction, and a positive electrode main grid line and a negative electrode main grid line extending along a second direction; wherein, A plurality of positive electrode fine grid lines and a plurality of negative electrode fine grid lines are arranged crosswise along a second direction, the second direction is perpendicular to the first direction, the positive electrode main grid lines are electrically connected to the plurality of positive electrode fine grid lines respectively, and the negative electrode main grid lines are electrically connected to the plurality of negative electrode fine grid lines respectively; The conductive adhesive portion is disposed on the positive electrode busbar and the negative electrode busbar, and the conductive tape is electrically connected to the conductive adhesive portion on the positive electrode busbar or the negative electrode busbar.

5. The battery assembly according to claim 4, characterized in that: A first insulating portion is provided at a position on the positive electrode fine grid line corresponding to the negative electrode main grid line, and at a position on the negative electrode fine grid line corresponding to the positive electrode main grid line; The width of the first insulating portion along the first direction is a first width, the width of the positive electrode busbar and the negative electrode busbar along the first direction is a second width, and the first width is greater than or equal to the second width.

6. The battery assembly according to claim 2, characterized in that: The electrode includes a plurality of positive electrode fine grid lines and a plurality of negative electrode fine grid lines extending along a first direction, and the plurality of positive electrode fine grid lines and the plurality of negative electrode fine grid lines are arranged crosswise along a second direction, and the second direction is perpendicular to the first direction; wherein, The conductive adhesive portion is disposed on the positive electrode fine grid line and the negative electrode fine grid line.

7. The battery assembly according to claim 6, characterized in that: The positive electrode fine grid lines and the negative electrode fine grid lines are provided with cross-distributed second insulating portions.

8. The battery assembly according to claim 2, characterized in that: The material of the conductive bonding part includes at least one of solder paste, conductive glue, silver paste and copper paste.

9. The battery assembly according to claim 1, characterized in that: The width of the insulating rubber layer is greater than the width of the conductive tape; The insulating adhesive layer covers the conductive tape in its entirety along the length direction of the conductive tape, or the insulating adhesive layer covers the conductive tape in sections along the length direction of the conductive tape.

10. The battery assembly according to any one of claims 1 to 9, characterized in that: The battery assembly further includes: a packaging layer connected to both sides of the battery string, wherein the width of the packaging layer is greater than the width of the battery string.

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