A battery assembly
By replacing silver grid lines with copper-plated grid lines and optimizing the grid line design, the problems of high cost and high resistance of battery modules were solved, resulting in lower resistance and higher photocurrent collection efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU MAXWELL TECH CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-24
Smart Images
Figure CN224556162U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic cell technology, and in particular to a cell module. Background Technology
[0002] Battery modules typically consist of multiple cells interconnected by solder ribbons. These ribbons connect the cells to each other, meaning the module's resistance includes not only the electrode resistance but also the resistance of the solder ribbons and the welding process itself, thus increasing the overall series resistance. Furthermore, existing battery cells generally have main and sub-busbars on their upper grid lines, which are screen-printed using silver paste, a relatively expensive material. Utility Model Content
[0003] Therefore, it is necessary to provide a battery assembly that addresses the above-mentioned problems by solving the issues of high cost and high resistance in existing battery assemblies.
[0004] On one hand, this application provides a battery assembly including a plurality of battery cells, each battery cell having a plurality of first main grid lines on one side and a plurality of second main grid lines on the other side; each of the first main grid lines and the second main grid lines are copper-plated grid lines.
[0005] Optionally, multiple first main gate lines are parallel to each other, and multiple second main gate lines are parallel to each other; the number of second main gate lines is greater than the number of first main gate lines.
[0006] Optionally, the weight of the first main gate line and the second main gate line lies between the copper solder strip and the silver electrode. Optionally,
[0007] The first main grid line is provided with a first connecting part and a second connecting part at both ends; the second main grid line is provided with a third connecting part and a fourth connecting part at both ends.
[0008] The third connection portion of the second main busbar of the Nth battery cell is connected to the second connection portion of the first main busbar of the N-1th battery cell, and the second connection portion of the first main busbar of the Nth battery cell is connected to the third connection portion of the second main busbar of the N+1th battery cell; wherein, N is an integer greater than 1.
[0009] Optionally, the plurality of first connecting parts are independent of each other, or the plurality of first connecting parts are connected to each other to form one or more continuous first connecting edges;
[0010] Multiple second connecting parts are independent of each other, or multiple second connecting parts are connected to each other to form one or more continuous second connecting edges;
[0011] The plurality of said third connecting parts are independent of each other, or the plurality of said third connecting parts are connected to each other to form one or more continuous third connecting edges; and / or
[0012] The plurality of fourth connecting parts are independent of each other, or the plurality of fourth connecting parts are connected to each other to form one or more continuous fourth connecting edges.
[0013] Optionally, the surfaces of the first connecting edge, the second connecting edge, the third connecting edge, and / or the fourth connecting edge are flat. When the second connecting portion of one of the battery cells is connected to the third connecting portion of the adjacent battery cell, the teeth of the second connecting edge are in contact with the surface of the third connecting edge.
[0014] Optionally, the surfaces of the first connecting edge, the second connecting edge, the third connecting edge and / or the fourth connecting edge are formed with a tooth shape, and when the second connecting portion of one of the battery cells is connected to the third connecting portion of the adjacent battery cell, the teeth of the second connecting edge and the teeth of the third connecting edge engage with each other.
[0015] Optionally, the second connecting edge and the third connecting edge are connected together by conductive adhesive, conductive glue, or conductive connecting foil.
[0016] Optionally, the width of each first main gate line gradually increases in the serial connection direction; the width of each first main gate line is 40 to 120 μm.
[0017] Optionally, the thickness of each first main gate line gradually increases in the serial connection direction; the thickness of each first main gate line is 5 to 40 μm.
[0018] Optionally, the width of each second main gate line gradually increases in the direction from the third connecting portion to the fourth connecting portion; the width of each second main gate line is 40 to 120 μm.
[0019] Optionally, the thickness of each second main gate line gradually increases in the serial connection direction; the thickness of each first main gate line is 5 to 40 μm.
[0020] Optionally, the cross-section of the first main grid line is any one of the following: a triangular shape, a superimposed shape with a square bottom and a triangular top, or a superimposed shape with a square bottom and a serrated top.
[0021] Optionally, the cross-section of the second main grid line is any one of the following: a triangular shape, a superimposed shape with a square at the bottom and a triangle at the top, or a superimposed shape with a square at the bottom and a serrated shape at the top.
[0022] The battery module of this application may include multiple battery cells, and each battery cell may include multiple first main grid lines on one side and multiple second main grid lines on the other side of each battery cell, wherein both the first and second main grid lines are copper-plated grid lines. The grid lines in the battery module of this application are less expensive than silver or silver-plated copper grid lines. Since both sides of the battery cell in this application only include main grid lines and no sub-grid lines, the resistance of the battery module can be reduced. Furthermore, adjacent battery cells in this application are directly connected together by the first and second main grid lines, eliminating the need for solder ribbon connections, thus reducing the resistance of the solder ribbon and the welding resistance, and consequently reducing the resistance of the battery module.
[0023] The number of second main grid lines in this application is greater than the number of first main grid lines. Since the front of the solar cell receives light, the number of first main grid lines is relatively small, resulting in less shading on the front of the solar cell and a larger photocurrent. Since the back of the solar cell does not need to receive light, the number of second main grid lines is relatively large, serving as a current collection function. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of a battery assembly provided in one embodiment of this application.
[0025] Figure 2 This is a schematic diagram of the structure of a battery assembly provided for another embodiment of this application.
[0026] Figure 3 This is a schematic diagram of one side of a battery cell provided in one embodiment of this application.
[0027] Figure 4 This is a schematic diagram of one side of a battery cell provided in another embodiment of this application.
[0028] Figure 5 This is a schematic diagram of one side of a battery cell provided in another embodiment of this application.
[0029] Figure 6 This is a schematic diagram of one side of a battery cell provided in another embodiment of this application.
[0030] Figure 7 This is a schematic diagram of the structure of another side of the battery cell provided in one embodiment of this application.
[0031] Figure 8 This is a structural schematic diagram of another side of the battery cell provided in another embodiment of this application.
[0032] Figure 9 This is a structural schematic diagram of another side of the battery cell provided in another embodiment of this application.
[0033] Figure 10This is a structural schematic diagram of another side of the battery cell provided in another embodiment of this application.
[0034] Figure 11 This is a schematic cross-sectional view of the first connecting edge of the battery cell provided in one embodiment of this application.
[0035] Figure 12 A schematic diagram of the cross-sectional structure of the first connecting edge of the battery cell provided in another embodiment of this application.
[0036] Figure 13 for Figure 3 A magnified view of a portion of point A in the middle.
[0037] Figure 14 for Figure 13 Sectional view along the BB direction.
[0038] Figure 15 for Figure 13 A CC-direction sectional view of one embodiment.
[0039] Figure 16 for Figure 13 A CC-direction sectional view of another embodiment.
[0040] Figure 17 for Figure 13 A CC-direction sectional view of another embodiment.
[0041] Explanation of reference numerals in the attached figures
[0042] Battery assembly - 100; Battery cell - 110; First main busbar - 111; Second main busbar - 112; First connecting part - 113; Second connecting part - 114; Third connecting part - 115; Fourth connecting part - 116; First connecting edge - 117; Second connecting edge - 118; Third connecting edge - 119; Fourth connecting edge - 120; Conductive adhesive - 130; Conductive foil - 140. Detailed Implementation
[0043] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.
[0044] As a specific embodiment of this application, such as Figure 1 and Figure 2 As shown, this embodiment provides a battery assembly 100, which may include a plurality of battery cells 110, the plurality of battery cells being stacked in layers (e.g., ...). Figure 1 They can be connected together in the manner shown, or they can be set side by side (as shown). Figure 2 (As shown) are connected together.
[0045] like Figures 3-8 As shown, each battery cell 110 has multiple parallel first main grid lines 111 on one side (e.g., Figures 3-6 As shown), on the other side are multiple parallel second main grid lines 112 (as shown). Figures 7-10 (As shown). Each of the first main gate line 111 and the second main gate line 112 is a copper-plated gate line.
[0046] Specifically, the battery assembly 100 of this embodiment may include multiple battery cells 110, and each battery cell 110 may include multiple first main grid lines 111 on one side and multiple second main grid lines 112 on the other side, wherein both the first main grid lines 111 and the second main grid lines 112 are copper-plated grid lines. Therefore, the copper-plated grid lines in the battery assembly 100 of this embodiment are less expensive than silver or silver-plated copper grid lines. Since both sides of the battery cell 110 in this embodiment only include main grid lines and no sub-grid lines, the resistance of the battery assembly 100 can be reduced.
[0047] Specifically, multiple battery cells 110 are sequentially connected to form a battery assembly 100 in such a way that the first main busbar 111 of the Mth battery cell 110 is connected to the second main busbar 112 of the M+1th battery cells 110. Here, M is a positive integer. In this embodiment, adjacent battery cells 110 are directly connected together by the first main busbar 111 and the second main busbar 112, eliminating the need for solder ribbon connections, reducing the resistance of the solder ribbon and the welding resistance, and thus reducing the resistance of the battery assembly 100.
[0048] In this embodiment, the battery assembly 100 is formed by connecting multiple battery cells 110 together in sequence, which can reduce the overall current of the battery assembly 100 and reduce current loss.
[0049] Specifically, in this embodiment, the multiple first main gate lines 111 are parallel to each other, and the multiple second main gate lines 112 are also parallel to each other. Preferably, the first main gate lines 111 and the second main gate lines 112 are also parallel to each other.
[0050] As a specific embodiment of this application, such as Figures 3-10 As shown, in this embodiment, the number of second main grid lines 112 is greater than the number of first main grid lines 111. Since the solar cell 110 receives light from the front, the number of first main grid lines 111 in this embodiment is small, resulting in less shading and a larger photocurrent, while the back side does not need to receive light. The large number of second main grid lines 112 in this embodiment serves to collect current.
[0051] Specifically, in this embodiment, the number of first main grid lines 111 on a single solar cell 110 is 80-200. The number of second main grid lines 112 is 100-300. By designing the number of these grid lines, the carrier transport distance can be shortened, thereby improving the cell efficiency. More specifically, as... Figure 3 As shown, in this embodiment, a first connecting portion 113 and a second connecting portion 114 are respectively provided at both ends of the first main grid line 111. Figure 7 As shown, the second main busbar 112 has a third connecting portion 115 and a fourth connecting portion 116 at both ends. The third connecting portion 115 of the second main busbar 112 of the Nth cell 110 is connected to the second connecting portion 114 of the first main busbar 111 of the (N-1)th cell 110, and the second connecting portion 114 of the first main busbar 111 of the Nth cell 110 is connected to the third connecting portion 115 of the second main busbar 112 of the N+1th cell 110. Here, N is a positive integer greater than 1.
[0052] Specifically, in this embodiment, connecting portions are designed at both ends of the grid lines. The grid lines of different battery cells 110 are ultimately connected together through the connecting portions. The size of the connecting portions can be larger than the size of the grid lines, which can improve the contact capability of the connecting portions of different battery cells 110 and avoid poor contact.
[0053] More specifically, such as Figure 3 As shown, in this embodiment, the first connecting portions 113 of the first main grid line 111 can all be independent of each other, and each first connecting portion 113 can be a square, rectangle, triangle, circle, etc. The positions of multiple first connecting portions 113 can be connected to each other using conductive non-electrical adhesive.
[0054] Optionally, such as Figures 4-6 As shown, in this embodiment, the first connecting portions 113 of the multiple first main grid lines 111 can be interconnected. These first connecting portions 113 can form a single line (e.g., ...). Figure 4 ) or multiple (such as Figure 5 and Figure 6 A first connecting edge 117 perpendicular to the first main gate line 111. The surface of the first connecting edge 117 can be flat (e.g., ...). Figure 11 As shown), it can also be a toothed type (such as...). Figure 12 (As shown).
[0055] Similarly, as Figure 3 As shown, the second connecting portions 114 of the first main grid line 111 can all be independent of each other, and each second connecting portion 114 can be a square, rectangle, triangle, circle, etc. The positions of multiple second connecting portions 114 can be connected to each other using non-conductive adhesive.
[0056] like Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, the second connecting portions 114 of the multiple first main grid lines 111 can be interconnected. These second connecting portions 114 can form a single line (e.g., ...). Figure 4 ) or multiple (such as Figure 5 and Figure 6 A second connecting edge 118 perpendicular to the first main gate line 111. The surface of the second connecting edge 118 can be flat (see...). Figure 11 It can also be a toothed type (see...). Figure 12 ).
[0057] Similarly, as Figure 7 As shown, in this embodiment, the third connecting portions 115 of the second main grid line 112 can all be independent of each other, and each third connecting portion 115 can be a square, rectangle, triangle, circle, etc. The positions of multiple third connecting portions 115 can be connected to each other using non-conductive adhesive.
[0058] like Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, the third connecting portions 115 of the multiple second main grid lines 112 can be interconnected. These third connecting portions 115 can form a single line (e.g., ...). Figure 8 ) or multiple (such as Figure 9 and Figure 10 A third connecting edge 119 perpendicular to the second main gate line 112. The surface of the third connecting edge 119 can be flat (e.g., ...). Figure 11 It can also be a toothed type (such as...) Figure 12 ).
[0059] Similarly, as Figure 7 As shown, in this embodiment, the fourth connecting portions 116 of the second main grid line 112 can all be independent of each other, and each fourth connecting portion 116 can be a square, rectangle, triangle, circle, etc. The positions of multiple fourth connecting portions 116 can be connected to each other using non-conductive adhesive.
[0060] like Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, the fourth connecting portions 116 of the multiple second main grid lines 112 can be interconnected. These fourth connecting portions 116 can form a single line (e.g., ...). Figure 8 ) or multiple (such as Figure 9 and Figure 10 A fourth connecting edge 120 perpendicular to the second main gate line 112. The surface of the fourth connecting edge 120 can be flat (e.g., ...). Figure 11 It can also be a toothed type (such as...) Figure 12 ).
[0061] Specifically, such as Figure 3 and Figure 7 As shown, in this embodiment, the multiple first connecting parts 113 are independent of each other, the multiple second connecting parts 114 are independent of each other, the multiple third connecting parts 115 are independent of each other, and / or the multiple fourth connecting parts 116 are independent of each other. In this case, the application of copper between each connecting part can be reduced, thereby reducing material costs.
[0062] In addition, such as Figures 4-6 , Figures 8-10 As shown, the first connecting edge 117, the second connecting edge 118, the third connecting edge 119, and / or the fourth connecting edge 120 are continuous. When there are multiple connecting edges (e.g., Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, since the overall connection method is prone to the whole piece falling off when the adhesive strength is insufficient in some parts, the multiple connecting edges are bonded separately to ensure the overall connection and solve the problem of the yield of the connecting edges.
[0063] In addition, such as Figure 4 , Figure 6 , Figure 8 , Figure 10 and Figure 11 As shown, when the first connecting edge 117, the second connecting edge 118, the third connecting edge 119 and / or the fourth connecting edge 120 are continuous and the surface of the connecting edge is flat, when the second connecting edge 118 of the Nth battery cell 110 and the third connecting edge 119 of the N+1th battery cell 110 are connected to each other, the second connecting edge 118 and the third connecting edge 119 are in contact with each other.
[0064] In addition, such as Figure 4 , Figure 6 , Figure 8 , Figure 10 and Figure 12 As shown, when the first connecting edge 117, the second connecting edge 118, the third connecting edge 119, and / or the fourth connecting edge 120 are continuous, and the surfaces of the connecting edges are toothed, the amount of copper used in the connecting edges can be reduced, thereby lowering costs. Furthermore, the interconnection of the toothed connecting edges increases the contact area and reduces welding resistance.
[0065] Specifically, since the second connecting portion 114 of the preceding battery cell 110 and the third connecting portion 115 of the following battery cell 110 are interconnected in this embodiment, the structure and shape of the second connecting portion 114 and the third connecting portion 115 must be consistent.
[0066] In one embodiment, when the second connection portions 114 of the multiple first main grid lines 111 are independent of each other, the third connection portions 115 of the multiple second main grid lines 112 are also independent of each other. The multiple second connection portions 114 are connected by non-conductive adhesive, and the multiple third connection portions 115 are also connected by non-conductive adhesive. The second connection portions 114 of the previous battery cell 110 and the third connection portions 115 of the subsequent battery cell 110 are connected together by non-conductive adhesive, conductive adhesive, or conductive foil.
[0067] In another embodiment, when the second connecting portions 114 of multiple first main grid lines 111 are interconnected to form a second connecting edge 118, the third connecting portions 115 of multiple second main grid lines 112 are also interconnected to form a third connecting edge 119. The second connecting edge 118 of the preceding battery cell 110 and the third connecting edge 119 of the following battery cell 110 are connected together with non-conductive adhesive, conductive adhesive, or conductive foil.
[0068] In another embodiment, when the second connecting portions 114 of multiple first main grid lines 111 are interconnected to form a second connecting edge 118, and the surface of the second connecting edge 118 is planar, then the third connecting portions 115 of multiple second main grid lines 112 are interconnected to form a third connecting edge 119, and the surface of the third connecting edge 119 is planar. The second connecting edge 118 of the preceding battery cell 110 and the third connecting edge 119 of the following battery cell 110 are connected together using non-conductive adhesive, conductive adhesive, or conductive foil.
[0069] In another embodiment, when the second connecting portions 114 of multiple first main grid lines 111 are interconnected to form a second connecting edge 118, and the surface of the second connecting edge 118 is toothed, then the third connecting portions 115 of multiple second main grid lines 112 are interconnected to form a third connecting edge 119, and the surface of the third connecting edge 119 is toothed. The second connecting edge 118 of the preceding battery cell 110 and the third connecting edge 119 of the following battery cell 110 are connected together with non-conductive adhesive, conductive adhesive 130, or conductive foil, and the teeth of the second connecting edge 118 and the teeth of the third connecting edge 119 can mesh with each other.
[0070] As one embodiment of this application, such as Figure 1 As shown, in this embodiment, when the preceding battery cell 110 and the following battery cell 110 are connected to each other, they can be connected in a stacked manner or side by side. When the battery cells 110 are connected in a stacked manner, the battery cells 110 can be tilted, and the second connecting portion 114 of the first main grid line 111 of the preceding battery cell 110 and the third connecting portion 115 of the second main grid line 112 of the following battery cell 110 are connected together by non-conductive adhesive, conductive adhesive 130, or conductive foil. When the battery cells 110 are connected side by side, as shown... Figure 2As shown, the conductive foil 140 needs to be formed into a Z-shape, and then the conductive foil 140 is used to connect the second connection portion 114 of the first main grid of the previous battery cell 110 to the third connection portion 115 of the second main grid line 112 of the next battery cell 110.
[0071] Specifically, when the battery cells 110 are connected using a non-conductive adhesive, one embodiment involves coating the non-conductive adhesive very thinly, making it conductive enough. Another embodiment uses a combination of conductive and non-conductive adhesives, whereby the conductive adhesive provides conductivity while the non-conductive adhesive is used to increase the bond strength.
[0072] As a specific embodiment of this application, such as Figure 13 As shown, in this embodiment, the width of each first main gate line 111 gradually increases in the direction from the first connecting portion 113 to the second connecting portion 114. Specifically, the width range of the first main gate line 111 in this embodiment is 40μm-120μm. For example, the width of each first main gate line 111 in the direction from the first connecting portion 113 to the second connecting portion 114 can gradually increase from 40μm to 120μm, or it can be a gradual change within any range of 40μm-120μm.
[0073] Specifically, such as Figure 14 As shown, in this embodiment, the thickness of each first main gate line 111 gradually increases in the direction from the first connecting portion 113 to the second connecting portion 114. The thickness range of the first main gate line 111 in this embodiment can be 5-40 μm, and the thickness of each first main gate line 111 in the direction from the first connecting portion 113 to the second connecting portion 114 can gradually increase from 5 μm to 40 μm, or it can be a gradual change within any range of 5-40 μm.
[0074] As a specific embodiment of this application, similar to the first main gate line 111, the width of each second main gate line 112 in this embodiment gradually increases in the direction from the third connecting portion 115 to the fourth connecting portion 116. Specifically, the width range of the second main gate line 112 in this embodiment is 40μm-120μm. For example, the width of each second main gate line 112 in the direction from the third connecting portion 115 to the fourth connecting portion 116 can gradually increase from 40μm to 120μm, or it can be a gradual change within any range of 40μm-120μm.
[0075] Specifically, in this embodiment, the thickness of each second main gate line 112 gradually increases in the direction from the third connecting portion 115 to the fourth connecting portion 116. The thickness range of the second main gate line 112 in this embodiment can be 5-40 μm, and the thickness of each second main gate line 112 in the direction from the third connecting portion 115 to the fourth connecting portion 116 can gradually increase from 5 μm to 40 μm, or it can be a gradual change within any range of 5-40 μm.
[0076] Specifically, since the current in the solar cell 110 is collected in an integral manner, gradually increasing from beginning to end with a large current at the end, in this embodiment, both the first main grid line 111 and the second main grid line 112 are designed with gradually increasing width and thickness in the direction of current flow, ultimately resulting in a gradually increasing cross-sectional area of the grid lines. This design reduces resistance and current loss, thus solving the problem of main grid line current loss (I0). 2 *R) problem.
[0077] As a specific embodiment of this application, such as Figures 15-17 As shown, the cross-section of the first main grid line 111 in this embodiment is any one of the following: a triangular shape, a square shape at the bottom and a triangular shape at the top, or a square shape at the bottom and a serrated shape at the top.
[0078] Specifically, in this embodiment, the cross-section of the first main grid line 111 is formed as a triangle to increase secondary reflection. Alternatively, the cross-section of the first main grid line 111 can be formed as a superimposed shape with a square bottom and a triangle top, increasing secondary reflection while simultaneously increasing the cross-sectional area and reducing resistance. Another option is to form the cross-section of the first main grid line 111 as a superimposed shape with a square bottom and a serrated top, increasing secondary reflection while also increasing the surface area, reducing pressure on the grid lines during lamination, and protecting the battery.
[0079] As a specific embodiment of this application, similar to the first main gate line 111, the cross-section of the second main gate line 112 in this embodiment is any one of the following: a triangular shape, a superimposed shape with a square bottom and a triangular top, or a superimposed shape with a square bottom and a serrated top.
[0080] Specifically, in this embodiment, the cross-section of the second main grid line 112 is formed as a triangle to increase secondary reflection. Alternatively, the cross-section of the second main grid line 112 can be formed as a superimposed shape with a square bottom and a triangle top, increasing secondary reflection while simultaneously increasing the cross-sectional area and reducing resistance. Another option is to form the cross-section of the second main grid line 112 as a superimposed shape with a square bottom and a serrated top, increasing secondary reflection while also increasing the surface area, reducing pressure on the grid lines during lamination, and protecting the battery.
[0081] In this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.
[0082] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.
[0083] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0084] In this application, unless otherwise expressly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.
[0085] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.
Claims
1. A battery assembly, characterized in that, It includes multiple battery cells, each battery cell having multiple first main grid lines on one side and multiple second main grid lines on the other side; each of the first and second main grid lines is a copper-plated grid line.
2. The battery assembly according to claim 1, characterized in that, Multiple first main gate lines are parallel to each other, and multiple second main gate lines are parallel to each other; the number of second main gate lines is greater than the number of first main gate lines.
3. The battery assembly according to claim 1, characterized in that, The weight of the first main grid line and the second main grid line lies between the copper solder strip and the silver electrode.
4. The battery assembly according to claim 1, characterized in that, The first main grid line is provided with a first connecting part and a second connecting part at both ends; the second main grid line is provided with a third connecting part and a fourth connecting part at both ends. The third connection portion of the second main busbar of the Nth battery cell is connected to the second connection portion of the first main busbar of the N-1th battery cell, and the second connection portion of the first main busbar of the Nth battery cell is connected to the third connection portion of the second main busbar of the N+1th battery cell; wherein, N is an integer greater than 1.
5. The battery assembly according to claim 4, characterized in that, Multiple first connecting parts are independent of each other, or multiple first connecting parts are connected to each other to form one or more continuous first connecting edges; Multiple second connecting parts are independent of each other, or multiple second connecting parts are connected to each other to form one or more continuous second connecting edges; The plurality of said third connecting parts are independent of each other, or the plurality of said third connecting parts are connected to each other to form one or more continuous third connecting edges; and / or The plurality of fourth connecting parts are independent of each other, or the plurality of fourth connecting parts are connected to each other to form one or more continuous fourth connecting edges.
6. The battery assembly according to claim 5, characterized in that, The surfaces of the first connecting edge, the second connecting edge, the third connecting edge and / or the fourth connecting edge are flat. When the second connecting portion of one of the battery cells is connected to the third connecting portion of the adjacent battery cell, the teeth of the second connecting edge are in contact with the surface of the third connecting edge.
7. The battery assembly according to claim 5, characterized in that, The surfaces of the first connecting edge, the second connecting edge, the third connecting edge and / or the fourth connecting edge are formed with a tooth shape. When the second connecting portion of one of the battery cells is connected to the third connecting portion of the adjacent battery cell, the teeth of the second connecting edge and the teeth of the third connecting edge engage with each other.
8. The battery assembly according to claim 5, characterized in that, The second connecting edge and the third connecting edge are connected together by non-conductive adhesive, conductive adhesive or conductive connecting foil.
9. The battery assembly according to claim 4, characterized in that, The width of each first main gate line gradually increases in the serial connection direction; the width of each first main gate line is 40 to 120 μm.
10. The battery assembly according to claim 4, characterized in that, The thickness of each first main gate line gradually increases in the serial connection direction; the thickness of each first main gate line is 5 to 40 μm.
11. The battery assembly according to claim 4, characterized in that, The width of each second main gate line gradually increases in the serial connection direction; the width of each second main gate line is 40 to 120 μm.
12. The battery assembly according to claim 4, characterized in that, The thickness of each second main gate line gradually increases in the serial connection direction; the thickness of each first main gate line is 5 to 40 μm.
13. The battery assembly according to claim 1, characterized in that, The cross-section of the first main grid line is any one of the following: a triangular shape, a square shape at the bottom and a triangular shape at the top, or a square shape at the bottom and a serrated shape at the top.
14. The battery assembly according to claim 1, characterized in that, The cross-section of the second main grid line is any one of the following: a triangular shape, a square shape at the bottom and a triangular shape at the top, or a square shape at the bottom and a serrated shape at the top.