Battery assembly

Abstract

The application relates to a battery assembly, comprising a battery string group, a first insulating strip, a first bus bar and a first solder strip, the battery string group comprising a plurality of battery strings arranged in a first direction in sequence; adjacent battery strings are parallel to each other; one of the two adjacent battery strings has a first edge cell, and the other has a second edge cell; the first edge cell and the second edge cell are arranged adjacently; the first insulating strip is overlapped on the first edge cell and the second edge cell; the first bus bar is arranged on a side of the first insulating strip away from the first edge cell and the second edge cell; the first solder strip connects the first edge cell and the second edge cell; part of the first solder strip is located on a side of the first bus bar close to the first insulating strip, and the first solder strip is connected with the first bus bar; at least one side of the first insulating strip in the first direction is provided with a notch; the orthographic projection of the notch on a first plane overlaps the orthographic projection of the first solder strip on the first plane.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery assembly. Background Technology

[0002] Solar cells, also known as photovoltaic cells, are semiconductor devices that directly convert sunlight into electrical energy. Because they are green and environmentally friendly products that do not cause pollution, and because solar energy is a renewable resource, solar cells are a new type of battery with broad development prospects.

[0003] In related technologies, battery modules consist of multiple battery strings, which are connected in series or parallel via solder ribbons and busbars. However, when solder ribbons are soldered to the battery cells in the battery strings, poor connection problems such as incomplete soldering can easily occur, affecting the output power of the battery module and shortening its lifespan. Utility Model Content

[0004] Based on this, this application provides a battery module to reduce the risk of poor soldering, improve the electrical performance, mechanical stability and reliability of the battery module, and extend the service life of the battery module.

[0005] This application provides a battery assembly, including:

[0006] A battery string assembly, comprising a plurality of battery strings arranged sequentially along a first direction; adjacent battery strings are connected in parallel; and one of two adjacent battery strings has a first edge battery piece and the other has a second edge battery piece; the first edge battery piece and the second edge battery piece are arranged adjacent to each other;

[0007] A first insulating strip, which overlaps the first edge battery sheet and the second edge battery sheet;

[0008] The first busbar is located on the side of the first insulating strip away from the first edge battery cell and the second edge battery cell;

[0009] A first solder strip connects the first edge battery cell and the second edge battery cell; a portion of the first solder strip is located on the side of the first busbar closest to the first insulating strip; the first solder strip is connected to the first busbar.

[0010] Wherein, the first insulating strip has a notch on at least one side along the first direction; the orthographic projection of the notch on the first plane overlaps with the orthographic projection of the first solder strip on the first plane; the first plane is parallel to the plane where the first edge battery cell is located and / or the plane where the second edge battery cell is located.

[0011] In one embodiment, the first insulating strip has a first notch on the side near the first edge battery cell, and the orthographic projection of the first notch on the first plane overlaps with the orthographic projection of the first solder strip on the first plane.

[0012] The first insulating strip has a second notch on the side near the second edge of the battery cell; the first notch and the second notch are arranged opposite to each other; the orthographic projection of the second notch on the first plane overlaps with the orthographic projection of the first solder strip on the first plane.

[0013] In one embodiment, the first notch has a first dimension along a second direction intersecting the first direction, and the first solder strip has a second dimension along the second direction, wherein the first dimension is greater than or equal to the second dimension;

[0014] And / or, the second notch has a third dimension along the second direction, the first solder strip has a second dimension along the second direction, and the third dimension is greater than or equal to the second dimension;

[0015] And / or, the orthographic projection of the first notch on the first plane overlaps with the orthographic projection of the first busbar on the first plane;

[0016] And / or, the orthographic projection of the second notch on the first plane overlaps with the orthographic projection of the first busbar on the first plane;

[0017] And / or, the dimension of the first notch along the first direction is 1mm to 10mm;

[0018] And / or, the second notch has a dimension of 1mm to 10mm along the first direction;

[0019] And / or, the dimension of the second notch along the first direction is equal to the dimension of the first notch along the first direction.

[0020] In one embodiment, the first solder strip includes a first sub-solder strip and a second sub-solder strip spaced apart along the first direction;

[0021] The first sub-welding strip is connected to the first edge battery cell, and the end of the first sub-welding strip away from the first edge battery cell is connected to the first busbar.

[0022] The second sub-weld strip connects to the second edge battery cell, and the end of the second sub-weld strip away from the second edge battery cell is connected to the first busbar.

[0023] In one embodiment, the end of the first sub-weld strip away from the first edge cell is located within the first notch; the end of the second sub-weld strip away from the second edge cell is located within the second notch;

[0024] And / or, the orthographic projection of the first sub-weld strip on the first plane does not overlap with the orthographic projection of the first insulating strip on the first plane; the orthographic projection of the second sub-weld strip on the first plane does not overlap with the orthographic projection of the first insulating strip on the first plane;

[0025] And / or, the first sub-weld strip and the second sub-weld strip have a third distance along the first direction, and the first busbar has a fourth dimension along the first direction, wherein the third distance is less than or equal to half of the fourth dimension;

[0026] And / or, the end of the first sub-weld strip away from the first busbar has a fourth distance from the first busbar; the end of the second sub-weld strip away from the first busbar has a fifth distance from the first busbar; the fourth distance is equal to the fifth distance.

[0027] In one embodiment, the orthographic projection of the first busbar on the first plane overlaps with the orthographic projection of the first insulating strip on the first plane;

[0028] And / or, the surface of the first insulating strip near the first busbar contacts the surface of the first busbar near the first insulating strip;

[0029] And / or, the dimension of the first busbar along the first direction is smaller than the maximum dimension of the first insulating strip along the first direction;

[0030] And / or, the maximum dimension of the first insulating strip along the first direction is 4mm to 50mm;

[0031] And / or, the dimension of the first busbar along the first direction is 2mm to 30mm.

[0032] In one embodiment, the orthographic projection of the first edge battery cell onto the first plane does not overlap with the orthographic projection of the second edge battery cell onto the first plane.

[0033] In one embodiment, the orthographic projection of the first edge battery cell onto the first plane overlaps with the orthographic projection of the second edge battery cell onto the first plane.

[0034] In one embodiment, the battery assembly includes a plurality of battery string groups arranged along a second direction intersecting the first direction; all the battery strings in the plurality of battery string groups are arranged along the second direction to form a plurality of battery string columns; the plurality of battery string columns are arranged sequentially along the first direction; two battery string columns at both ends of the plurality of battery string columns along the first direction are respectively a first end battery string column and a second end battery string column; the plurality of battery strings in the first end battery string column are connected in series; the plurality of battery strings in the second end battery string column are connected in series.

[0035] In one embodiment, the battery string in the first end battery string includes a first end battery cell and a first end battery cell adjacent to the first end battery cell;

[0036] The battery assembly also includes:

[0037] The second insulating strip overlaps the first end battery piece and the first end battery piece of at least two battery strings in the first end battery string;

[0038] The second busbar is located on the side of the second insulating strip away from the first end battery cell and the first end battery cell;

[0039] The second solder strip connects to the first end cell, and a portion of the second solder strip is located on the side of the second busbar near the second insulating strip, and the second solder strip is connected to the second busbar;

[0040] The second insulating strip has a third notch on the side near the first end of the battery cell, and the orthographic projection of the third notch on the first plane overlaps with the orthographic projection of the second solder strip on the first plane.

[0041] In one embodiment, the orthographic projection of the second solder strip on the first plane overlaps with the orthographic projection of the second busbar on the first plane;

[0042] And / or, the end of the second solder strip away from the first end cell is located within the third notch; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the third notch on the first plane; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the second insulating strip on the first plane;

[0043] And / or, the orthographic projection of the second solder strip on the first plane does not overlap with the orthographic projection of the second insulating strip on the first plane.

[0044] In one embodiment, the second insulating strip extends along the second direction; the second insulating strip overlaps the first end battery piece and the first end battery piece of all battery strings in the first end battery string; a plurality of the third notches are provided on the side of the second insulating strip near the first end battery piece; the plurality of the third notches are spaced apart along the second direction;

[0045] The second busbar extends along the second direction; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the second insulating strip on the first plane; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the third notch on the first plane;

[0046] Multiple second solder strips are spaced apart along the second direction, and each of the multiple second solder strips corresponds to one of the multiple third notches; each second solder strip is connected to a first end battery cell, and the end of each second solder strip away from the corresponding first end battery cell is connected to the second busbar.

[0047] And / or, the third notch has a fifth dimension along the second direction, and the second weld strip has a sixth dimension along the second direction, wherein the fifth dimension is greater than or equal to the sixth dimension;

[0048] And / or, the orthographic projection of the second insulating strip on the first plane overlaps with the orthographic projection of the first end battery cell on the first plane; and overlaps with the orthographic projection of the first end battery cell on the first plane;

[0049] And / or, the surface of the second busbar near the second insulating strip contacts the surface of the second insulating strip near the second busbar;

[0050] And / or, the dimension of the second busbar along the first direction is smaller than the maximum dimension of the second insulating strip along the first direction;

[0051] And / or, the maximum dimension of the second insulating strip along the first direction is 2mm to 50mm;

[0052] And / or, the dimension of the third notch along the first direction is 0.5mm to 20mm;

[0053] And / or, the second busbar has a dimension of 2mm to 30mm along the first direction.

[0054] In one embodiment, the battery string in the second end battery string includes a second end battery cell and a second end battery cell adjacent to the second end battery cell;

[0055] The battery assembly also includes:

[0056] The third insulating strip overlaps the second end battery piece and the second end battery piece of at least two battery strings in the second end battery string;

[0057] The third busbar is located on the side of the third insulating strip away from the second end battery cell and the second end battery cell;

[0058] The third solder strip connects to the second end cell; a portion of the third solder strip is located on the side of the third busbar near the third insulating strip; and the third solder strip is connected to the third busbar.

[0059] The third insulating strip has a fourth notch on the side near the second end of the battery cell; the orthographic projection of the fourth notch on the first plane overlaps with the orthographic projection of the third solder strip on the first plane.

[0060] In one embodiment, the orthographic projection of the third solder strip on the first plane overlaps with the orthographic projection of the third busbar on the first plane;

[0061] And / or, the end of the third solder strip away from the second end cell is located within the fourth notch; the orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the fourth notch on the first plane; the orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the third insulating strip on the first plane;

[0062] And / or, the orthographic projection of the third solder strip on the first plane does not overlap with the orthographic projection of the third insulating strip on the first plane.

[0063] In one embodiment, the third insulating strip extends along the second direction; the third insulating strip overlaps the second end battery sheet and the second end battery sheet of all battery strings in the second end battery string; a plurality of fourth notches are provided on the side of the third insulating strip near the second end battery sheet; the plurality of fourth notches are spaced apart along the second direction;

[0064] The third busbar extends along the second direction; the orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the third insulating strip on the first plane; the orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the fourth notch on the first plane;

[0065] The plurality of third welding strips are spaced apart along the second direction, and the plurality of third welding strips correspond one-to-one with the plurality of fourth notches; each third welding strip is connected to a second end battery cell, and the end of each third welding strip away from the corresponding second end battery cell is connected to the third busbar;

[0066] And / or, the fourth notch has a seventh dimension along the second direction, the third weld strip has an eighth dimension along the second direction, and the seventh dimension is greater than or equal to the eighth dimension;

[0067] And / or, the orthographic projection of the third insulating strip on the first plane overlaps with the orthographic projection of the second end battery cell on the first plane; and overlaps with the orthographic projection of the second end battery cell on the first plane;

[0068] And / or, the surface of the third busbar near the third insulating strip is in contact with the surface of the third insulating strip near the third busbar;

[0069] And / or, the dimension of the third busbar along the first direction is smaller than the maximum dimension of the third insulating strip along the first direction;

[0070] And / or, the maximum dimension of the third insulating strip along the first direction is 2mm to 50mm;

[0071] And / or, the dimension of the fourth notch along the first direction is 0.5mm to 20mm;

[0072] And / or, the dimension of the third busbar along the first direction is 2mm to 30mm.

[0073] In the aforementioned battery assembly, a first insulating strip overlaps the first and second edge battery cells; a first busbar is located on the side of the first insulating strip away from the first and second edge battery cells; a first solder strip connects the first and second edge battery cells; a portion of the first solder strip is located on the side of the first busbar closer to the first insulating strip; the first solder strip is connected to the first busbar; at least one side of the first insulating strip along a first direction has a notch; the orthographic projection of the notch on a first plane overlaps with the orthographic projection of the first solder strip on the first plane. Thus, on the one hand, the first solder strip facilitates the parallel connection of two adjacent battery strings in the battery string group, and the first busbar leads out the current of the battery string group, improving the conversion efficiency of the battery assembly. On the other hand, by positioning a portion of the first solder strip on the side of the first busbar closer to the first insulating strip, the height of the first solder strip relative to the first and second edge battery cells can be reduced, allowing the first solder strip to adhere more tightly to the first and second edge battery cells, reducing the risk of poor soldering between the first solder strip and the first edge battery cell, and between the first solder strip and the second edge battery cell, thereby improving the structural stability and reliability of the battery assembly. Furthermore, by providing a notch on at least one side of the first insulating strip along the first direction, and by having the orthographic projection of the notch on the first plane overlap with the orthographic projection of the first solder strip on the first plane, the first solder strip can adhere to the first edge cell and / or the second edge cell through the notch. This further reduces the height of the solder strip relative to the first edge cell and / or the second edge cell, allowing the first solder strip to make full contact with the solder paste on the first edge cell and / or the second edge cell. This further reduces the rate of poor soldering when the first solder strip is soldered to the first edge cell and / or the second edge cell, avoiding power loss and shortened lifespan caused by poor soldering, improving the electrical performance, mechanical stability, and reliability of the battery module, and extending the service life of the battery module. In summary, this application can reduce the risk of poor soldering in battery modules, improve the electrical performance, mechanical stability, and reliability of battery modules, and extend the service life of battery modules. Attached Figure Description

[0074] Figure 1 This is a plan view of a battery assembly provided in some embodiments of this application.

[0075] Figure 2 for Figure 1 The diagram shows a partial structural schematic of the battery assembly.

[0076] Figure 3 for Figure 2 The shown is a CC cross-sectional view of the battery assembly.

[0077] Figure 4 for Figure 1 Another partial structural diagram of the battery assembly is shown.

[0078] Figure 5 for Figure 4 The battery assembly shown is a DD cross-sectional view.

[0079] Figure 6 for Figure 1 A partial structural schematic diagram of the first insulating strip of the battery assembly is shown.

[0080] Figure 7 for Figure 1 This is another partial structural diagram of the battery assembly shown.

[0081] Figure 8 for Figure 7 The EE cross-sectional view of the battery assembly is shown.

[0082] Figure 9 for Figure 7 A partial structural schematic diagram of the second insulating strip of the battery assembly is shown.

[0083] Figure 10 for Figure 1 Another partial structural diagram of the battery assembly is shown.

[0084] Figure 11 for Figure 10 The FF cross-sectional view of the battery assembly shown.

[0085] Figure 12 for Figure 10 A partial structural diagram of the third insulating strip of the battery assembly is shown.

[0086] Explanation of reference numerals in the attached figures:

[0087] 10. Battery assembly; 11. Battery string assembly; 12. Battery string array; 12a. First end battery string array; 12b. Second end battery string array; 13. Battery string; 131. Battery cell; 131a. First edge battery cell; 131b. Second edge battery cell; 131c. First end battery cell; 131d. First end battery cell; 131e. Second end battery cell; 131f. Second end battery cell; 14. First insulating strip; 14a. Notch; 141. First notch; 142. Second... 15. First busbar; 16. First weld strip; 16a. First end; 16b. Second end; 161. First sub-weld strip; 162. Second sub-weld strip; 17. Second insulating strip; 171. Third notch; 18. Second busbar; 19. Second weld strip; 201. Third insulating strip; 2011. Fourth notch; 202. Third busbar; 203. Third weld strip; 204. Series weld strip; 204a. First series weld strip; 204b. Second series weld strip; X. First direction; Y. Second direction. Detailed Implementation

[0088] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0089] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0090] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0091] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0092] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0093] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0094] See Figure 1 and Figure 2 As shown, this application provides a battery assembly 10, including a battery string group 11, a first insulating strip 14, a first busbar 15, and a first solder strip 16. The battery string group 11 includes a plurality of battery strings 13 arranged sequentially along a first direction X. Adjacent battery strings 13 are connected in parallel. One of two adjacent battery strings 13 has a first edge battery piece 131a, and the other has a second edge battery piece 131b. The first edge battery piece 131a and the second edge battery piece 131b are arranged adjacent to each other. The first insulating strip 14 overlaps the first edge battery piece 131a and the second edge battery piece 131b. The first busbar 15 is disposed on the first insulating strip 14. The first edge battery cell 14 is located away from the first edge battery cell 131a and the second edge battery cell 131b; the first solder strip 16 connects the first edge battery cell 131a and the second edge battery cell 131b; a portion of the first solder strip 16 is located on the side of the first busbar 15 near the first insulating strip 14, and the first solder strip 16 is connected to the first busbar 15; wherein, the first insulating strip 14 has a notch 14a on at least one side along the first direction X; the orthographic projection of the notch 14a on the first plane overlaps with the orthographic projection of the first solder strip 16 on the first plane; the first plane is parallel to the plane where the first edge battery cell 131a is located and / or the plane where the second edge battery cell 131b is located.

[0095] It should be noted that a portion of the first solder strip 16 is located on the side of the first busbar 15 near the first insulating strip 14, which can be understood as a portion of the first solder strip 16 being located between the first busbar 15 and the first insulating strip 14; or, a portion of the first solder strip 16 being located between the first busbar 15 and the first edge battery cell 131a, and between the first busbar 15 and the second edge battery cell 131b.

[0096] Specifically, the battery string 13 may include multiple battery cells 131 arranged and connected in series along the first direction X. The number of battery cells 131 to be connected in series can be determined according to specific circumstances. The orthographic projections of one battery cell 131 onto the first plane may or may not overlap with the orthographic projections of the other battery cell 131 onto the first plane. Within the same battery string 13, adjacent battery cells 131 can be connected in series using methods such as soldering ribbons or conductive adhesive. For example, such as... Figure 1 As shown, within the same battery string 13, two adjacent battery cells 131 can be connected by a series welding strip 204. The series welding strip 204 includes a first series welding strip 204a and a second series welding strip 204b. In the first direction X, the first series welding strip 204a and the second series welding strip 204b are staggered. In the second direction Y, which intersects with the first direction, the first series welding strip 204a and the second series welding strip 204b are staggered. In the same battery string 13, the Nth battery cell 131, the N+1th battery cell 131, and the N+2th battery cell 131 (N is a positive integer greater than 1) are arranged sequentially along the first direction X. The positive electrode solder joint of the Nth battery cell 131 and the negative electrode solder joint of the N+1th battery cell 131 are connected in series by multiple first series solder strips 204a, and the positive electrode solder joint of the N+1th battery cell 131 and the negative electrode solder joint of the N+2th battery cell 131 are connected in series by multiple second series solder strips 204b.

[0097] For example, such as Figure 1 As shown, each battery string 13 has two battery cells 131 at its two ends along the first direction X, namely a first edge battery cell 131a and a second edge battery cell 131b. In two adjacent battery strings 13 along the first direction X, the first edge battery cell 131a of one battery string 13 is arranged adjacent to the second edge battery cell 131b of the other battery string 13. The battery cell 131 can be a back-contact battery cell 131, and the back side of the battery cell 131 is provided with multiple grid lines, including multiple main grid lines and multiple sub-grid lines. Of course, the multiple grid lines can also only include multiple sub-grid lines, that is, the battery cell 131 can be a battery cell 131 without main grids. The back side of the battery cell 131 can include multiple first polarity regions and multiple second polarity regions, and the multiple grid lines include multiple first grid lines corresponding to the multiple first polarity regions and multiple second grid lines corresponding to the multiple second polarity regions.

[0098] In this embodiment, the first insulating strip 14 overlaps the first edge battery cell 131a and the second edge battery cell 131b; the first busbar 15 is disposed on the side of the first insulating strip 14 away from the first edge battery cell 131a and the second edge battery cell 131b. That is, the first busbar 15 is disposed on the back of the first edge battery cell 131a and the second edge battery cell 131b, and the first insulating strip 14 separates the first busbar 15 from the first edge battery cell 131a and the second edge battery cell 131b. In this way, no space needs to be reserved for placing the busbar, which can increase the number of battery cells 131 in the battery assembly 10, that is, increase the cell arrangement ratio, increase the conversion efficiency of the battery assembly 10, and improve the electrical performance of the battery assembly 10. In addition, when viewed from the front of the battery assembly 10, the first insulating strip 14 covers the first busbar 15, improving the aesthetics of the battery assembly 10.

[0099] The first solder ribbon 16 connects the first edge cell 131a and the second edge cell 131b. That is, the first solder ribbon 16 is connected to the first grid line of the first edge cell 131a and the first grid line of the second edge cell 131b; or, the first solder ribbon 16 is connected to the second grid line of the first edge cell 131a and the second grid line of the second edge cell 131b, realizing the parallel connection of the first edge cell 131a and the second edge cell 131b, thereby realizing the parallel connection of two adjacent battery strings 13 in the battery string group 11. The first solder strip 16 is located on the side of the first busbar 15 near the first insulating strip 14 and is connected to the first busbar 15. This reduces the height of the first solder strip 16 relative to the first edge cell 131a and the second edge cell 131b, allowing the first solder strip 16 to fit more tightly with the first edge cell 131a and the second edge cell 131b. This reduces the risk of poor soldering between the first solder strip 16 and the first edge cell 131a, and between the first solder strip 16 and the second edge cell 131b. It can also draw out the current from the cell string 13 of the battery string group 11, improve the conversion efficiency of the battery module 10, and improve the structural stability and reliability of the battery module 10.

[0100] During assembly, the first insulating strip 14 is overlapped onto the first edge battery cell 131a and the second edge battery 131b. The first solder ribbon 16 and the first busbar 15 are pre-welded together, and the solder ribbon 16 and the first busbar 15, which are welded together, are then bonded to the first insulating strip 14; or, the solder ribbon 16 and the first busbar 15, which are welded together, are bonded to the first insulating strip 14, and then the first insulating strip 14 is bonded to the first edge battery cell 131a and the second edge battery. Because the first insulating strip 14 has a certain thickness, the portion of the first solder ribbon 16 near the first insulating strip 14 is raised. When the first solder ribbon 16 is soldered to the first edge battery cell 131a and / or the second edge battery, the adhesion between the first solder ribbon 16 and the first edge battery cell 131a and / or the second edge battery cell 131b is poor, resulting in insufficient contact between the first solder ribbon 16 and the solder paste on the first edge battery cell 131a and / or the second edge battery cell 131b, leading to poor soldering. Therefore, in this embodiment, the first insulating strip 14 has a notch 14a on at least one side along the first direction X; the orthographic projection of the notch 14a on the first plane overlaps with the orthographic projection of the first solder strip 16 on the first plane, and the first plane is parallel to the plane where the first edge battery cell 131a and / or the plane where the second edge battery cell 131b are located. In this way, the portion of the first solder strip 16 near the first insulating strip 14 can be bonded to the first edge battery cell 131a and / or the second edge battery cell 131b through the notch 14a, which can reduce the height of the first solder strip 16 relative to the battery cell 131, so that the first solder strip 16 can make full contact with the solder paste on the first edge battery cell 131a and / or the second edge battery cell 131b, further reducing the rate of poor soldering when the first solder strip 16 is soldered to the first edge battery cell 131a and / or the second edge battery cell 131b, avoiding power loss and shortened lifespan caused by poor soldering, improving the electrical performance, mechanical stability and reliability of the battery module 10, and extending the service life of the battery module 10.

[0101] In summary, the battery assembly 10 provided in this application embodiment has a first insulating strip 14 overlapping the first edge battery cell 131a and the second edge battery cell 131b; a first busbar 15 is disposed on the side of the first insulating strip 14 away from the first edge battery cell 131a and the second edge battery cell 131b; a first solder strip 16 connects the first edge battery cell 131a and the second edge battery cell 131b; a portion of the first solder strip 16 is located on the side of the first busbar 15 close to the first insulating strip 14 and is connected to the first busbar 15; at least one side of the first insulating strip 14 along the first direction X has a notch 14a; the orthographic projection of the notch 14a on the first plane overlaps with the orthographic projection of the first solder strip 16 on the first plane. Thus, on the one hand, the first solder strip 16 facilitates the parallel connection of two adjacent battery strings 13 in the battery string group 11, and the first busbar 15 leads out the current of the battery string group 11, improving the conversion efficiency of the battery assembly 10. On the other hand, by placing a portion of the first solder strip 16 on the side of the first busbar 15 close to the first insulating strip 14, the height of the first solder strip 16 relative to the first edge cell 131a and the second edge cell 131b can be reduced, allowing the first solder strip 16 to fit more tightly with the first edge cell 131a and the second edge cell 131b, reducing the risk of poor soldering between the first solder strip 16 and the first edge cell 131a and between the first solder strip 16 and the second edge cell 131b, and improving the structural stability and reliability of the battery assembly 10. Furthermore, the portion of the first solder ribbon 16 near the first insulating strip 14 can be bonded to the first edge cell 131a and / or the second edge cell 131b through the notch 14a, which can further reduce the height of the first solder ribbon 16 relative to the cell 131, allowing the first solder ribbon 16 to fully contact the solder paste on the first edge cell 131a and / or the second edge cell 131b. This further reduces the rate of poor soldering when the first solder ribbon 16 is soldered to the first edge cell 131a and / or the second edge cell 131b, avoiding power loss and shortened lifespan caused by poor soldering, improving the electrical performance, mechanical stability and reliability of the battery module 10, and extending the service life of the battery module 10.

[0102] In some of these embodiments, see Figure 2 and Figure 4 As shown, the first insulating strip 14 has a first notch 141 on the side near the first edge battery cell 131a, and the orthographic projection of the first notch 141 on the first plane overlaps with the orthographic projection of the first solder strip 16 on the first plane; the first insulating strip 14 has a second notch 142 on the side near the second edge battery cell 131b; the first notch 141 and the second notch 142 are arranged opposite to each other; the orthographic projection of the second notch 142 on the first plane overlaps with the orthographic projection of the first solder strip 16 on the first plane.

[0103] Therefore, the first solder ribbon 16 can be bonded to the first edge cell 131a through the first notch 141, and the first solder ribbon 16 can be bonded to the second edge cell 131b through the second notch 142, so that the first solder ribbon 16 can fully contact the solder paste on the first edge cell 131a and the second edge cell 131b, further reducing the failure rate of poor soldering when the first solder ribbon 16 is bonded to the first edge cell 131a and the second edge cell 131b, avoiding power loss and shortened life caused by poor soldering, improving the electrical performance, mechanical stability and reliability of the battery module 10, and extending the service life of the battery module 10.

[0104] Further, see Figure 2 , Figure 4 and Figure 6 As shown, the battery assembly 10 may include multiple first solder ribbons 16, each corresponding to one of the aforementioned multiple first polarity regions. A first insulating strip 14 may have multiple first notches 141 on the side near the first edge battery cell 131a, and multiple second notches 142 on the side near the second edge battery cell 131b. The multiple first solder ribbons 16 correspond one-to-one with the multiple first notches 141 and one-to-one with the multiple second notches 142. This further reduces the risk of poor soldering between the first solder ribbons 16 and the first edge battery cell 131a and the second edge battery cell 131b, improving the output power, structural stability, and reliability of the battery assembly 10, and extending its service life. Furthermore, the first insulating strip 14 between adjacent first notches 141 can shield non-polarity grid lines and non-polarity solder ribbons, preventing short circuits and reducing the cost and number of steps for printing insulating adhesive on the battery assembly 10.

[0105] In some embodiments, the first notch 141 has a first dimension along the second direction Y, and the first solder strip 16 has a second dimension along the second direction Y, wherein the first dimension is greater than or equal to the second dimension.

[0106] This makes it easier for the first solder strip 16 and the first edge cell 131a to fit together during welding, which can further reduce the risk of poor welding between the first solder strip 16 and the first edge cell 131a, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0107] In some embodiments, the second notch 142 has a third dimension along the second direction Y, the first solder strip 16 has a second dimension along the second direction Y, and the third dimension is greater than or equal to the second dimension.

[0108] This makes it easier for the first solder strip 16 and the second edge cell 131b to fit together during welding, which can further reduce the risk of poor welding between the first solder strip 16 and the second edge cell 131b, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0109] In one embodiment, see [reference] Figure 2 and Figure 4 As shown, the orthographic projection of the first notch 141 on the first plane overlaps with the orthographic projection of the first busbar 15 on the first plane.

[0110] Therefore, the size of the first notch 141 along the first direction X can be larger, which can further reduce the height of the first solder strip 16 relative to the first edge cell 131a, allowing the first solder strip 16 to transition smoothly from the first insulating strip 14 to the first edge cell 131a. This further improves the bonding tightness between the first solder strip 16 and the first edge cell 131a during welding, thereby further reducing the rate of poor soldering between the first solder strip 16 and the first edge cell 131a, improving the output power, structural stability, and reliability of the battery module 10, and extending the service life of the battery module 10. In addition, the height of the side of the first busbar 15 closest to the first edge cell 131a can be reduced, allowing the side of the first busbar 15 closest to the first edge cell 131a to be in close contact with the first solder strip 16. This increases the contact area between the first busbar 15 and the first solder strip 16, improving the connection reliability between the first solder strip 16 and the first busbar 15, so that the current of the battery string 13 can be drawn out, improving the conversion efficiency of the battery module 10.

[0111] In one embodiment, see [reference] Figure 2 and Figure 4 As shown, the orthographic projection of the second notch 142 on the first plane overlaps with the orthographic projection of the first busbar 15 on the first plane.

[0112] Therefore, the second notch 142 can be made larger in the first direction X, which can further reduce the height of the first solder strip 16 relative to the second edge cell 131b, allowing the first solder strip 16 to transition smoothly from the first insulating strip 14 to the second edge cell 131b. This further improves the bonding tightness between the first solder strip 16 and the second edge cell 131b during welding, thereby further reducing the failure rate of the solder joint between the first solder strip 16 and the first edge cell 131a. In addition, the height of the side of the first busbar 15 closest to the second edge cell 131b can be reduced, allowing the side of the first busbar 15 closest to the second edge cell to be in close contact with the first solder strip 16. This increases the contact area between the first busbar 15 and the first solder strip 16, improving the connection reliability between the first solder strip 16 and the first busbar 15, so that the current of the battery string 13 can be drawn out, improving the conversion efficiency of the battery module 10.

[0113] In one embodiment, the size of the first notch 141 along the first direction X is 1mm to 10mm. Specifically, the size of the first notch 141 along the first direction X can be any value among 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or 1mm to 10mm, and can be set according to the actual situation.

[0114] Therefore, by limiting the size of the first notch 141 along the first direction X within the aforementioned range, the first solder strip 16 and the first edge battery cell 131a are more easily bonded during welding, which can further reduce the risk of poor welding between the first solder strip 16 and the first edge battery cell 131a, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0115] Furthermore, the orthographic projection of the first notch 141 onto the plane can be a quadrilateral, specifically, a rectangle.

[0116] In one embodiment, the size of the second notch 142 along the first direction X is 1mm to 10mm. Specifically, the size of the second notch 142 along the first direction X can be any value among 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or 1mm to 10mm, and can be set according to the actual situation.

[0117] Therefore, by limiting the size of the second notch 142 along the first direction X within the aforementioned range, the first solder strip 16 and the second edge battery cell 131b are more easily bonded during welding, which can further reduce the risk of poor welding between the first solder strip 16 and the second edge battery cell 131b, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0118] Furthermore, the orthographic projection of the second notch 142 onto the plane can be a quadrilateral, specifically a rectangle.

[0119] In one embodiment, the size of the second notch 142 along the first direction X is equal to the size of the first notch 141 along the first direction X.

[0120] This reduces the risk of poor soldering between the first solder strip 16 and the first edge cell 131a and the second edge cell 131b, thereby improving the output power, structural stability and reliability of the battery module 10 and extending its service life.

[0121] It should be noted that, due to manufacturing process errors, the equality of A and B as described in this article includes not only absolute equality but also approximate equality. For example, A and B are considered equal when A and B satisfy the relationship 0.95B≤A≤1.05B, or 0.95A≤B≤1.05A.

[0122] In some of these embodiments, see Figure 2 and Figure 3 As shown, the first insulating strip 14 extends along the second direction Y intersecting the first direction X; the orthographic projection of the first insulating strip 14 on the first plane overlaps with the orthographic projection of the first edge battery cell 131a on the first plane; the orthographic projection of the first insulating strip 14 on the first plane overlaps with the orthographic projection of the second edge battery cell 131b on the first plane; the first solder strip 16 extends along the first direction X; the first solder strip 16 spans across the first insulating strip 14; the first busbar 15 extends along the second direction Y; the first busbar 15 spans across the first solder strip 16.

[0123] In other words, the first solder strip 16 is a continuous, whole solder strip. When the first busbar 15 and the first solder strip 16 are fixed on the battery module 10, the first solder strip 16 is subjected to relatively uniform force at both ends along the first direction, making the first solder strip 16 less prone to displacement and improving the yield of the manufactured battery module 10.

[0124] In some embodiments, see Figure 2 As shown, the orthographic projection of the first solder strip 16 on the first plane overlaps with the orthographic projection of the first insulating strip 14 on the first plane.

[0125] In this way, the first insulating strip 14 can separate the first solder strip 16 from other conductive materials, thus preventing short circuits.

[0126] In some embodiments, see Figure 2 As shown, the orthographic projection of the first solder strip 16 on the first plane overlaps with the orthographic projection of the first busbar 15 on the first plane.

[0127] In this way, the first solder strip 16 can be easily connected to the first busbar 15 so as to conduct the current on the battery cell 131 and improve the conversion efficiency of the battery module 10.

[0128] In some embodiments, see Figure 2 and Figure 3 As shown, the first solder strip 16 includes a first end 16a and a second end 16b disposed opposite each other along a first direction X; the first end 16a and the first busbar 15 have a first distance, and the second end 16b and the first busbar 15 have a second distance; the first distance is equal to the second distance. This makes the connection length between the first solder strip 16 and the first edge battery cell 131a, and the connection length between the first solder strip 16 and the second edge battery cell 131b, tend to be consistent, making the current path length of the battery strings 13 located on both sides of the first busbar 15 along the first direction X tend to be consistent, making the output current of the parallel battery strings 13 tend to be consistent, reducing the probability of current mismatch and improving the output power of the battery assembly 10. Furthermore, when the first busbar 15 and the first solder strip 16 are fixed to the battery assembly 10, the first end 16a and the second end 16b of the first solder strip 16 are subjected to uniform force, making it less likely for the first end 16a and the second end 16b of the first solder strip 16 to shift, thus improving the yield of the manufactured battery assembly 10.

[0129] In some of these embodiments, see Figure 2 and Figure 3 As shown, the first solder strip 16 is symmetrically arranged about the first busbar 15 along the centerline parallel to the second direction Y.

[0130] This ensures that the current path lengths of the battery strings 13 located on both sides of the first busbar 15 along the first direction X are consistent, making the output current of the parallel battery strings 13 consistent, further reducing the probability of current mismatch and improving the output power of the battery assembly 10.

[0131] In other embodiments, see Figure 4 and Figure 5 As shown, the first solder strip 16 includes a first sub-solder strip 161 and a second sub-solder strip 162 spaced apart along the first direction X; the first sub-solder strip 161 is connected to the first edge battery cell 131a, and one end of the first sub-solder strip 161 away from the first edge battery cell 131a is connected to the first busbar 15; the second sub-solder strip 162 is connected to the second edge battery cell 131b, and one end of the second sub-solder strip 162 away from the second edge battery cell 131b is connected to the first busbar 15.

[0132] This reduces the thickness of the overlapping area between the first insulating strip 14 and the first busbar 15, thereby reducing the probability of microcracks occurring in the first edge battery cell 131a and the second edge battery cell 131b.

[0133] In some embodiments, the end of the first sub-weld strip 161 away from the first edge cell 131a is located within the first notch 141; the end of the second sub-weld strip 162 away from the second edge cell 131b is located within the second notch 142.

[0134] This can further reduce the thickness of the overlapping area of ​​the first insulating strip 14 and the first busbar 15, and reduce the probability of microcracks occurring in the first edge battery cell 131a and the second edge battery cell 131b.

[0135] Understandably, the end of the first sub-weld ribbon 161 furthest from the first edge cell 131a is located at the first notch 141, meaning a portion of the first sub-weld ribbon 161 is located between the first edge cell 131a and the first busbar 15. The end of the second sub-weld ribbon 162 furthest from the second edge cell 131b is located within the second notch 142, meaning a portion of the second sub-weld ribbon 162 is located between the second edge cell 131b and the first busbar 15.

[0136] In some embodiments, the orthographic projection of the first sub-welding strip 161 on the first plane does not overlap with the orthographic projection of the first insulating strip 14 on the first plane; the orthographic projection of the second sub-welding strip 162 on the first plane does not overlap with the orthographic projection of the first insulating strip 14 on the first plane.

[0137] This can further reduce the thickness of the overlapping area of ​​the first insulating strip 14 and the first busbar 15, and reduce the probability of microcracks occurring in the first edge battery cell 131a and the second edge battery cell 131b.

[0138] In some of these embodiments, see Figure 4 and Figure 5 As shown, the first sub-weld strip 161 and the second sub-weld strip 162 have a third distance along the first direction X, and the first busbar 15 has a fourth dimension along the first direction X. The third distance is less than or equal to half of the fourth dimension.

[0139] Therefore, the connection length between the first sub-welding strip 161 and the first busbar 15 and the connection length between the second sub-welding strip 162 and the first busbar 15 can both be greater than or equal to one-quarter of the fourth dimension of the first busbar 15 along the first direction X, thereby improving the connection reliability between the first sub-welding strip 161 and the first busbar 15 and between the second sub-welding strip 162 and the first busbar 15, and thus improving the structural stability and reliability of the battery assembly 10.

[0140] In some of these embodiments, see Figure 4 and Figure 5As shown, the end of the first sub-weld strip 161 that is away from the first busbar 15 has a fourth distance from the first busbar 15; the end of the second sub-weld strip 162 that is away from the first busbar 15 has a fifth distance from the first busbar 15; the fourth distance is equal to the fifth distance.

[0141] This improves the connection reliability between the first sub-welding strip 161 and the first busbar 15, and between the second sub-welding strip 162 and the first busbar 15, thereby improving the structural stability and reliability of the battery assembly 10.

[0142] In some of these embodiments, see Figure 2 and Figure 3 As shown, the orthographic projection of the first busbar 15 on the first plane overlaps with the orthographic projection of the first insulating strip 14 on the first plane.

[0143] Therefore, the first insulating strip 14 can be used to cover the first busbar 15, improving the aesthetics when viewed from the front of the battery assembly 10.

[0144] In some of these embodiments, see Figure 3 As shown, the surface of the first insulating strip 14 near the first busbar 15 is in contact with the surface of the first busbar 15 near the first insulating strip 14.

[0145] This increases the contact area between the first busbar 15 and the first insulating strip 14. The first insulating strip 14 can be used to easily fix the first busbar 15 and the first solder strip 16 onto the battery cell 131, reducing the difficulty of placing the first busbar 15 and the first solder strip 16 onto the battery assembly 10 and the probability of displacement. This improves the structural stability and reliability of the battery assembly 10 and extends its service life.

[0146] In some of these embodiments, see Figure 2 and Figure 4 As shown, the dimension of the first busbar 15 along the first direction X is smaller than the maximum dimension of the first insulating strip 14 along the first direction X.

[0147] Therefore, the first insulating strip 14 can be conveniently used to cover the first busbar 15, improving the aesthetics of the battery module 10. In addition, the first insulating strip 14 can be used to insulate the first busbar 15 from non-polar grid lines and non-polar solder strips, reducing the probability of short circuits. At the same time, it can reduce the cost and number of steps for printing insulating adhesive on the battery module 10.

[0148] In some embodiments, the maximum dimension of the first insulating strip 14 along the first direction X is 4mm to 50mm. Specifically, the maximum dimension of the first insulating strip 14 along the first direction X can be any value between 4mm, 8mm, 12mm, 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, or 4mm to 50mm, and can be set according to the actual situation.

[0149] Therefore, by limiting the maximum size of the first insulating strip 14 along the first direction X to the above-mentioned numerical range, the first insulating strip 14 can be used to insulate the first busbar 15 from the grid lines and solder strips of different polarities, reducing the probability of short circuits. At the same time, the cost and process of printing insulating adhesive on the battery assembly 10 can be reduced.

[0150] It should be noted that the maximum dimension of the first insulating strip 14 along the first direction X can be understood as: the dimension of the first insulating strip 14 without the notch 14a along the first direction X is 4mm to 50mm.

[0151] In some embodiments, the dimension of the first busbar 15 along the first direction X is 2mm to 30mm. Specifically, the dimension of the first busbar 15 along the first direction X can be any value among 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm or 1mm to 10mm, and can be set according to the actual situation.

[0152] Therefore, by limiting the size of the first busbar 15 along the first direction X within the aforementioned range, the resistance of the first busbar 15 can be reduced, the power loss of the first busbar 15 when drawing current can be reduced, thereby increasing the output power of the battery assembly 10.

[0153] In some embodiments, the orthographic projections of the first edge battery cell 131a and the second edge battery cell 131b on the first plane overlap; the orthographic projection of the first sub-strip 161 on the first plane is outside the overlapping area; and the orthographic projection of the second sub-strip 162 on the first plane is outside the overlapping area.

[0154] Therefore, the first sub-welding strip 161 and the second sub-welding strip 162 can avoid the overlapping area of ​​the first edge battery cell 131a and the second edge battery cell 131b, thereby reducing the thickness of the overlapping area of ​​the first edge battery cell 131a and the second edge battery cell 131b and reducing the probability of microcracks in the first edge battery cell 131a and the second edge battery cell 131b.

[0155] In other embodiments, see Figure 5As shown, the orthographic projection of the first edge battery cell 131a on the first plane does not overlap with the orthographic projection of the second edge battery cell 131b on the first plane.

[0156] This reduces the likelihood of microcracks occurring in the first edge cell 131a and the second edge cell 131b.

[0157] In some of these embodiments, see Figure 1 As shown, the battery assembly 10 includes multiple battery string groups 11, which are arranged along a second direction Y; all battery strings 13 in the multiple battery string groups 11 are arranged along the second direction Y to form multiple battery string columns 12; the multiple battery string columns 12 are arranged sequentially along a first direction X; the two battery string columns 12 at both ends along the first direction X are respectively a first end battery string column 12a and a second end battery string column 12b; the multiple battery strings 13 in the first end battery string column 12a are connected in series with each other; the multiple battery strings 13 in the second end battery string column 12b are connected in series with each other.

[0158] Therefore, the battery strings 13 arranged along the first direction X can be connected in parallel, and the battery strings 13 arranged along the second direction Y can be connected in series, avoiding the situation where the entire battery assembly 10 cannot work due to an abnormality in the battery cell 131 in a certain battery string 13, which is beneficial to improving the output power of the battery assembly 10.

[0159] In some of these embodiments, see Figures 7 to 9 As shown, the battery string 13 in the first end battery string 12a includes a first end battery piece 131c and a first end battery piece 131d adjacent to the first end battery piece 131c; the battery assembly 10 also includes a second insulating strip 17, a second busbar 18 and a second solder strip 19. The second insulating strip 17 overlaps the first end battery piece 131c and the first end battery piece 131d of at least two battery strings 13 in the first end battery string 12a; the second busbar 18 is located on the side of the second insulating strip 17 away from the first end battery piece 131c and the first end battery piece 131d; the second solder strip 19 connects to the first end battery piece 131c, and a portion of the second solder strip 19 is located on the side of the second busbar 18 close to the second insulating strip 17, and the second solder strip 19 is connected to the second busbar 18; the side of the second insulating strip 17 close to the first end battery piece 131c is provided with a third notch 171, and the orthographic projection of the third notch 171 on the first plane overlaps with the orthographic projection of the second solder strip 19 on the first plane.

[0160] Therefore, by positioning a portion of the second solder ribbon 19 on the side of the second busbar 18 closer to the second insulating strip 17, and connecting the second solder ribbon 19 to the second busbar 18, the height of the second solder ribbon 19 relative to the first end cell 131c can be reduced. This allows the second solder ribbon 19 to fit tightly against the first end cell 131c, reducing the rate of poor soldering when welding the second solder ribbon 19 to the first end cell 131c. Furthermore, the end of the second solder ribbon 19 furthest from the first end cell 131c can be connected to the second busbar 18 via the third notch 171, further reducing the height of the second solder ribbon 19 relative to the first end cell 131c. This allows the second solder ribbon 19 to make full contact with the solder paste on the first end cell 131c, further reducing the rate of poor soldering when welding the second solder ribbon 19 to the first end cell 131c, avoiding power loss and shortened lifespan caused by poor soldering, improving the electrical performance, mechanical stability, and reliability of the battery module 10, and extending the service life of the battery module 10.

[0161] It should be noted that, as mentioned above, the two battery pieces 131 at both ends of each battery string 13 along the first direction X are respectively the first edge battery piece 131a and the second edge battery piece 131b; each battery string 13 in the first end battery string 12a also includes the first edge battery piece 131a and the second edge battery piece 131b, and the first end battery piece 131c can be one of the first edge battery piece 131a and the second edge battery piece 131b. A portion of the second solder strip 19 is located on the side of the second busbar 18 near the second insulating strip 17, which can be understood as the portion of the second solder strip 19 being located between the second busbar 18 and the second insulating strip 17; or, the portion of the second solder strip 19 being located between the second busbar 18 and the first end battery piece 131c.

[0162] In some of these embodiments, see Figure 7 and Figure 8 As shown, the orthographic projection of the second solder strip 19 on the first plane overlaps with the orthographic projection of the second busbar 18 on the first plane.

[0163] This allows the second solder strip 19 to be easily connected to the second busbar 18, so as to discharge the current in the cell 13 and improve the conversion efficiency of the battery module 10.

[0164] In some embodiments, the end of the second solder strip 19 away from the first end cell 131c is located within the third notch 171; the orthographic projection of the second busbar 18 on the first plane overlaps with the orthographic projection of the third notch 171 on the first plane; the orthographic projection of the second busbar 18 on the first plane overlaps with the orthographic projection of the second insulating strip 17 on the first plane.

[0165] In this way, the second busbar 18 can be connected to the second solder strip 19 located in the third notch 171. The second solder strip 19 will not extend into the overlapping area between the second busbar 18 and the second insulating strip 17, thereby reducing the probability of microcracks occurring in the first end cell 131c.

[0166] In some embodiments, the orthographic projection of the second solder strip 19 onto the first plane does not overlap with the orthographic projection of the second insulating strip 17 onto the first plane.

[0167] This can further reduce the probability of microcracks occurring in the first end cell 131c.

[0168] Further, see Figure 7 and Figure 9 As shown, the second insulating strip 17 extends along the second direction Y; the second insulating strip 17 overlaps the first end battery cell 131c and the first end battery cell 131d of all battery cells 13 in the first end battery cell array 12a; a plurality of third notches 171 are provided on the side of the second insulating strip 17 near the first end battery cell 131c; the plurality of third notches 171 are spaced apart along the second direction Y; the second busbar 18 extends along the second direction Y; the orthographic projection of the second busbar 18 on the first plane overlaps with the orthographic projection of the second insulating strip 17 on the first plane; the orthographic projection of the second busbar 18 on the first plane overlaps with the orthographic projection of the third notches 171 on the first plane; a plurality of second solder strips 19 are spaced apart along the second direction Y, and the plurality of second solder strips 19 correspond one-to-one with the plurality of third notches 171; each second solder strip 19 is connected to a first end battery cell 131c, and the end of each second solder strip 19 away from the corresponding first end battery cell 131c is connected to the second busbar 18. Therefore, all battery strings 13 in the first end battery string 12a can be connected in series.

[0169] In some embodiments, the third notch 171 has a fifth dimension along the second direction Y, and the second solder strip 19 has a sixth dimension along the second direction Y, wherein the fifth dimension is greater than or equal to the sixth dimension.

[0170] This makes it easier for the second welding strip 19 to adhere to the first end cell 131c during welding, which can further reduce the risk of poor welding between the second welding strip 19 and the first end cell 131c, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0171] In some of these embodiments, see Figure 7 and Figure 8 As shown, the orthographic projection of the second insulating strip 17 on the first plane overlaps with the orthographic projection of the first end battery cell 131c on the first plane; and overlaps with the orthographic projection of the first end battery cell 131d on the first plane.

[0172] Thus, the second insulating strip 17 can separate the second busbar 18 from the non-polar grid lines and non-polar solder strips on the first end cell 131c and the first end cell 131d, avoiding short circuits.

[0173] In some of these embodiments, see Figure 7 and Figure 8 As shown, the surface of the second busbar 18 near the second insulating strip 17 is in contact with the surface of the second insulating strip 17 near the second busbar 18.

[0174] This increases the contact area between the second busbar 18 and the second insulating strip 17. The second insulating strip 17 can be used to easily fix the second busbar 18 and the second solder strip 19 onto the battery cell 131, reducing the difficulty of placing the second busbar 18 and the second solder strip 19 onto the battery module 10 and the probability of displacement. This improves the structural stability and reliability of the battery module 10 and extends its service life.

[0175] In one embodiment, see [reference] Figure 7 As shown, the dimension of the second busbar 18 along the first direction X is smaller than the maximum dimension of the second insulating strip 17 along the first direction X.

[0176] Therefore, the second insulating strip 17 can be used to conveniently cover the second busbar 18, improving the aesthetics of the battery assembly 10. In addition, the second insulating strip 17 can separate the second busbar 18 from the non-polar grid lines and non-polar solder ribbons on the first end cell 131c and the first end cell 131d, avoiding short circuits.

[0177] In some of these embodiments, see Figure 7 As shown, the maximum dimension of the second insulating strip 17 along the first direction X is 2mm to 50mm. Specifically, the maximum dimension of the second insulating strip 17 along the first direction X can be any value between 2mm, 6mm, 10mm, 14mm, 18mm, 22mm, 26mm, 30mm, 34mm, 38mm, 42mm, 46mm, 50mm, or 2mm to 50mm, and can be set according to the actual situation.

[0178] Therefore, by limiting the maximum size of the second insulating strip 17 along the first direction X to the above-mentioned numerical range, the second insulating strip 17 can be used to insulate the second busbar 18 from the grid lines and solder strips of different polarities, reducing the probability of short circuits. At the same time, the cost and process of printing insulating adhesive on the battery assembly 10 can be reduced.

[0179] It should be noted that the maximum dimension of the second insulating strip 17 along the first direction X can be understood as: the dimension of the second insulating strip 17 at the location where the third notch 171 is not opened along the first direction X is 2mm to 50mm.

[0180] In some embodiments, the dimension of the third notch 171 along the first direction X is 0.5mm to 20mm. Specifically, the dimension of the third notch 171 along the first direction X can be any value among 0.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm or 0.5mm to 20mm, and can be set according to the actual situation.

[0181] Therefore, by limiting the size of the third notch 171 along the first direction X within the aforementioned range, the second solder strip 19 and the first end cell 131c are more easily bonded during welding, which can further reduce the risk of poor soldering between the second solder strip 19 and the first end cell 131c, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0182] In some embodiments, the second busbar 18 has a dimension of 2mm to 30mm along the first direction X. Specifically, the dimension of the second busbar 18 along the first direction X can be any value among 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm or 2mm to 20mm, and can be set according to the actual situation.

[0183] Therefore, by limiting the size of the second busbar 18 within the aforementioned range along the first direction X, the resistance of the second busbar 18 can be reduced, the power loss of the second busbar 18 when drawing current can be reduced, thereby increasing the output power of the battery assembly 10.

[0184] In some of these embodiments, see Figures 10 to 12As shown, the battery string 13 in the second end battery string 12b includes a second end battery cell 131e and a second end battery cell 131f adjacent to the second end battery cell 131e; the battery assembly 10 also includes a third insulating strip 201, a third busbar 202 and a third solder strip 203, the third insulating strip 201 overlapping the second end battery cell 131e and the second end battery cell 131f of at least two battery strings 13 in the second end battery string 12b; the third busbar 202 is located at the distance from the third insulating strip 201. On one side away from the second end cell 131e and the second end cell 131f; a third solder strip 203 connects to the second end cell 131e, and a portion of the third solder strip 203 is located on the side of the third busbar 202 near the third insulating strip 201; and the third solder strip 203 is connected to the third busbar 202; a fourth notch 2011 is provided on the side of the third insulating strip 201 near the second end cell 131e; the orthographic projection of the fourth notch 2011 on the first plane overlaps with the orthographic projection of the third solder strip 203 on the first plane.

[0185] Therefore, by positioning a portion of the third solder strip 203 on the side of the third busbar 202 closer to the third insulating strip 201, and connecting the third solder strip 203 to the third busbar 202, the height of the third solder strip 203 relative to the second end cell 131e can be reduced. This allows the third solder strip 203 to fit tightly against the second end cell 131e, reducing the rate of poor soldering when welding the third solder strip 203 to the second end cell 131e. Furthermore, the end of the third solder strip 203 furthest from the second end cell 131e can be connected to the third busbar 202 via the fourth notch 2011, further reducing the height of the third solder strip 203 relative to the second end cell 131e. This allows the third solder strip 203 to make full contact with the solder paste on the second end cell 131e, further reducing the rate of poor soldering when welding the third solder strip 203 to the second end cell 131e, avoiding power loss and shortened lifespan caused by poor soldering, improving the electrical performance, mechanical stability, and reliability of the battery module 10, and extending the service life of the battery module 10.

[0186] It should be noted that, as mentioned above, the two battery pieces 131 at both ends of each battery string 13 along the first direction X are respectively the first edge battery piece 131a and the second edge battery piece 131b; each battery string 13 in the second end battery string 12b also includes the first edge battery piece 131a and the second edge battery piece 131b, and the second end battery piece 131e can be one of the first edge battery piece 131a and the second edge battery piece 131b.

[0187] In some of these embodiments, see Figure 11 As shown, the orthographic projection of the third welding strip 203 on the first plane overlaps with the orthographic projection of the third busbar 202 on the first plane.

[0188] This allows for easy connection between the third welding strip 203 and the third busbar 202, enabling the current in the battery cell 13 to be discharged, thereby improving the conversion efficiency of the battery module 10.

[0189] In some embodiments, the end of the third solder strip 203 away from the second end cell 131e is located within the fourth notch 2011; the orthographic projection of the third busbar 202 on the first plane overlaps with the orthographic projection of the fourth notch 2011 on the first plane; the orthographic projection of the third busbar 202 on the first plane overlaps with the orthographic projection of the third insulating strip 201 on the first plane.

[0190] In this way, the third busbar 202 can be connected to the third solder strip 203 located in the fourth notch 2011. The third solder strip 203 will not extend into the overlapping area between the third busbar 202 and the third insulating strip 201, thereby reducing the probability of microcracks occurring in the second end cell 131e.

[0191] In some embodiments, the orthographic projection of the third solder strip 203 on the first plane does not overlap with the orthographic projection of the third insulating strip 201 on the first plane.

[0192] This can further reduce the probability of microcracks occurring in the second end cell 131e.

[0193] In some of these embodiments, see Figures 10 to 12 As shown, the third insulating strip 201 extends along the second direction Y; the third insulating strip 201 overlaps the second end battery pieces 131e and second end battery pieces 131f of all battery strings 13 in the second end battery string 12b; a plurality of fourth notches 2011 are provided on the side of the third insulating strip 201 near the second end battery piece 131e; the plurality of fourth notches 2011 are spaced apart along the second direction Y; the third busbar 202 extends along the second direction Y; the orthographic projection of the third busbar 202 on the first plane overlaps with the orthographic projection of the third insulating strip 201 on the first plane; the orthographic projection of the third busbar 202 on the first plane overlaps with the orthographic projection of the fourth notches 2011 on the first plane; a plurality of third solder strips 203 are spaced apart along the second direction Y, and the plurality of third solder strips 203 correspond one-to-one with the plurality of fourth notches 2011; each third solder strip 203 is connected to a second end battery piece 131e, and the end of each third solder strip 203 away from the corresponding second end battery piece 131e is connected to the third busbar 202. Therefore, all the battery strings 13 in the second end battery string 12b can be connected in series.

[0194] In some embodiments, the fourth notch 2011 has a seventh dimension along the second direction Y, and the third solder strip 203 has an eighth dimension along the second direction Y, wherein the seventh dimension is greater than or equal to the eighth dimension.

[0195] This makes it easier for the third welding strip 203 to adhere to the second end cell 131e during welding, which can further reduce the risk of poor welding between the third welding strip 203 and the second end cell 131e, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0196] In some of these embodiments, see Figure 10 As shown, the orthographic projection of the third insulating strip 201 on the first plane overlaps with the orthographic projection of the second end battery piece 131e on the first plane; and overlaps with the orthographic projection of the second end battery piece 131f on the first plane.

[0197] Thus, the third insulating strip 201 can separate the third busbar 202 from the non-polar grid lines and non-polar solder strips on the second end cell 131e and the second end cell 131f, avoiding short circuits.

[0198] In some of these embodiments, see Figure 10 As shown, the surface of the third busbar 202 near the third insulating strip 201 is in contact with the surface of the third insulating strip 201 near the third busbar 202.

[0199] This increases the contact area between the third busbar 202 and the third insulating strip 201. The third insulating strip 201 can be used to easily fix the third busbar 202 and the third welding strip 203 onto the battery cell 131, reducing the difficulty of placing the third busbar 202 and the third welding strip 203 onto the battery module 10 and the probability of misalignment. This improves the structural stability and reliability of the battery module 10 and extends its service life.

[0200] In some embodiments, the dimension of the third busbar 202 along the first direction X is smaller than the maximum dimension of the third insulating strip 201 along the first direction X.

[0201] Therefore, the third insulating strip 201 can be used to conveniently cover the third busbar 202, improving the aesthetics of the battery assembly 10. In addition, the third insulating strip 201 can separate the third busbar 202 from the non-polar grid lines and non-polar solder strips on the second end cell 131e and the second end cell 131f, avoiding short circuits.

[0202] In some embodiments, the maximum dimension of the third insulating strip 201 along the first direction X is 2mm to 50mm; specifically, the maximum dimension of the third insulating strip 201 along the first direction X can be any value between 2mm, 6mm, 10mm, 14mm, 18mm, 22mm, 26mm, 30mm, 34mm, 38mm, 42mm, 46mm, 50mm or 2mm to 50mm, and can be set according to the actual situation.

[0203] Therefore, by limiting the maximum size of the third insulating strip 201 along the first direction X to the above-mentioned numerical range, the third insulating strip 201 can be used to insulate the third busbar 202 from the grid lines and solder strips of different polarities, reducing the probability of short circuits. At the same time, the cost and process of printing insulating adhesive on the battery assembly 10 can be reduced.

[0204] It should be noted that the maximum dimension of the third insulating strip 201 along the first direction X can be understood as: the dimension of the third insulating strip 201 without the fourth notch 2011 along the first direction X is 2mm to 50mm.

[0205] In some embodiments, the dimension of the fourth notch 2011 along the first direction X is 0.5mm to 20mm. Specifically, the dimension of the fourth notch 2011 along the first direction X can be any value among 0.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm or 0.5mm to 20mm, and can be set according to the actual situation.

[0206] Therefore, by limiting the size of the fourth notch 2011 along the first direction X within the aforementioned range, the third solder strip 203 and the second end cell 131e are more easily bonded during welding, which can further reduce the risk of poor welding between the third solder strip 203 and the second end cell 131e, improve the output power, structural stability and reliability of the battery module 10, and extend the service life of the battery module 10.

[0207] In some embodiments, the dimension of the third busbar 202 along the first direction X is 2mm to 30mm. Specifically, the dimension of the third busbar 202 along the first direction X can be any value among 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm or 2mm to 20mm, and can be set according to the actual situation.

[0208] Therefore, by limiting the size of the third busbar 202 along the first direction X within the aforementioned range, the resistance of the third busbar 202 can be reduced, the power loss of the third busbar 202 when drawing out current can be reduced, thereby increasing the output power of the battery assembly 10.

[0209] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0210] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery assembly, characterized in that, include: A battery string assembly, comprising a plurality of battery strings arranged sequentially along a first direction; adjacent battery strings are connected in parallel; and one of two adjacent battery strings has a first edge battery piece and the other has a second edge battery piece; the first edge battery piece and the second edge battery piece are arranged adjacent to each other; A first insulating strip, which overlaps the first edge battery sheet and the second edge battery sheet; The first busbar is located on the side of the first insulating strip away from the first edge battery cell and the second edge battery cell; A first solder strip connects the first edge battery cell and the second edge battery cell; a portion of the first solder strip is located on the side of the first busbar closest to the first insulating strip; the first solder strip is connected to the first busbar. Wherein, the first insulating strip has a notch on at least one side along the first direction; the orthographic projection of the notch on the first plane overlaps with the orthographic projection of the first solder strip on the first plane; The first plane is parallel to the plane where the first edge battery cell is located and / or the plane where the second edge battery cell is located.

2. The battery assembly according to claim 1, characterized in that, The first insulating strip has a first notch on the side near the first edge of the battery cell; the orthographic projection of the first notch on the first plane overlaps with the orthographic projection of the first solder strip on the first plane; The first insulating strip has a second notch on the side near the second edge of the battery cell; the first notch and the second notch are arranged opposite to each other; the orthographic projection of the second notch on the first plane overlaps with the orthographic projection of the first solder strip on the first plane.

3. The battery assembly according to claim 2, characterized in that, The first notch has a first dimension along a second direction intersecting the first direction, and the first weld strip has a second dimension along the second direction, wherein the first dimension is greater than or equal to the second dimension; And / or, the second notch has a third dimension along the second direction, the first solder strip has a second dimension along the second direction, and the third dimension is greater than or equal to the second dimension; And / or, the orthographic projection of the first notch on the first plane overlaps with the orthographic projection of the first busbar on the first plane; And / or, the orthographic projection of the second notch on the first plane overlaps with the orthographic projection of the first busbar on the first plane; And / or, the dimension of the first notch along the first direction is 1mm to 10mm; And / or, the second notch has a dimension of 1mm to 10mm along the first direction; And / or, the dimension of the second notch along the first direction is equal to the dimension of the first notch along the first direction.

4. The battery assembly according to claim 2, characterized in that, The first solder strip includes a first sub-solder strip and a second sub-solder strip that are spaced apart along the first direction; The first sub-welding strip is connected to the first edge battery cell, and the end of the first sub-welding strip away from the first edge battery cell is connected to the first busbar. The second sub-weld strip connects to the second edge battery cell, and the end of the second sub-weld strip away from the second edge battery cell is connected to the first busbar.

5. The battery assembly according to claim 4, characterized in that, The end of the first sub-weld strip away from the first edge battery cell is located within the first notch; the end of the second sub-weld strip away from the second edge battery cell is located within the second notch; And / or, the orthographic projection of the first sub-weld strip on the first plane does not overlap with the orthographic projection of the first insulating strip on the first plane; the orthographic projection of the second sub-weld strip on the first plane does not overlap with the orthographic projection of the first insulating strip on the first plane; And / or, the first sub-weld strip and the second sub-weld strip have a third distance along the first direction, and the first busbar has a fourth dimension along the first direction, wherein the third distance is less than or equal to half of the fourth dimension; And / or, the end of the first sub-weld strip away from the first busbar has a fourth distance from the first busbar; the end of the second sub-weld strip away from the first busbar has a fifth distance from the first busbar; the fourth distance is equal to the fifth distance.

6. The battery assembly according to claim 1, characterized in that, The first insulating strip extends along a second direction intersecting the first direction; the orthographic projection of the first insulating strip on the first plane overlaps with the orthographic projection of the first edge battery on the first plane; the orthographic projection of the first insulating strip on the first plane overlaps with the orthographic projection of the second edge battery on the first plane. The first solder strip extends along the first direction; The first welding strip is laid across the first insulating strip; The first busbar extends along the second direction and is positioned across the first solder strip; And / or, the orthographic projection of the first solder strip on the first plane overlaps with the orthographic projection of the first insulating strip on the first plane; And / or, the orthographic projection of the first solder strip on the first plane overlaps with the orthographic projection of the first busbar on the first plane; And / or, the first solder strip includes a first end and a second end disposed opposite to each other along the first direction; the first end and the first busbar have a first distance, and the second end and the first busbar have a second distance; the first distance is equal to the second distance; And / or, the first solder strip is symmetrically arranged about the centerline of the first busbar along a direction parallel to the second direction.

7. The battery assembly according to any one of claims 1 to 6, characterized in that, The orthographic projection of the first busbar on the first plane overlaps with the orthographic projection of the first insulating strip on the first plane; And / or, the surface of the first insulating strip near the first busbar contacts the surface of the first busbar near the first insulating strip; And / or, the dimension of the first busbar along the first direction is smaller than the maximum dimension of the first insulating strip along the first direction; And / or, the maximum dimension of the first insulating strip along the first direction is 4mm to 50mm; And / or, the dimension of the first busbar along the first direction is 2mm to 30mm.

8. The battery assembly according to any one of claims 1 to 6, characterized in that, The orthographic projection of the first edge battery cell onto the first plane does not overlap with the orthographic projection of the second edge battery cell onto the first plane.

9. The battery assembly according to any one of claims 1 to 6, characterized in that, The orthographic projection of the first edge battery cell onto the first plane overlaps with the orthographic projection of the second edge battery cell onto the first plane.

10. The battery assembly according to any one of claims 1 to 6, characterized in that, The battery assembly includes multiple battery string groups, which are arranged along a second direction intersecting the first direction; all the battery strings in the multiple battery string groups are arranged along the second direction to form multiple battery string columns; the multiple battery string columns are arranged sequentially along the first direction; two battery string columns at both ends of the multiple battery string columns along the first direction are respectively a first end battery string column and a second end battery string column; multiple battery strings in the first end battery string column are connected in series; multiple battery strings in the second end battery string column are connected in series.

11. The battery assembly according to claim 10, characterized in that, The battery string in the first end battery string includes a first end battery cell and a first end battery cell adjacent to the first end battery cell; The battery assembly also includes: The second insulating strip overlaps the first end battery piece and the first end battery piece of at least two battery strings in the first end battery string; The second busbar is located on the side of the second insulating strip away from the first end battery cell and the first end battery cell; The second solder strip connects to the first end cell; a portion of the second solder strip is located on the side of the second busbar near the second insulating strip, and the second solder strip is connected to the second busbar. The second insulating strip has a third notch on the side near the first end of the battery cell, and the orthographic projection of the third notch on the first plane overlaps with the orthographic projection of the second solder strip on the first plane.

12. The battery assembly according to claim 11, characterized in that, The orthographic projection of the second solder strip on the first plane overlaps with the orthographic projection of the second busbar on the first plane; And / or, the end of the second solder strip away from the first end cell is located within the third notch; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the third notch on the first plane; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the second insulating strip on the first plane; And / or, the orthographic projection of the second solder strip on the first plane does not overlap with the orthographic projection of the second insulating strip on the first plane.

13. The battery assembly according to claim 11, characterized in that, The second insulating strip extends along the second direction; the second insulating strip overlaps the first end battery piece and the first end battery piece of all battery strings in the first end battery string; a plurality of the third notches are provided on the side of the second insulating strip near the first end battery piece; the plurality of the third notches are spaced apart along the second direction; The second busbar extends along the second direction; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the second insulating strip on the first plane; the orthographic projection of the second busbar on the first plane overlaps with the orthographic projection of the third notch on the first plane; Multiple second solder strips are spaced apart along the second direction, and each of the multiple second solder strips corresponds to one of the multiple third notches; each second solder strip is connected to a first end battery cell, and the end of each second solder strip away from the corresponding first end battery cell is connected to the second busbar. And / or, the third notch has a fifth dimension along the second direction, and the second weld strip has a sixth dimension along the second direction, wherein the fifth dimension is greater than or equal to the sixth dimension; And / or, the orthographic projection of the second insulating strip on the first plane overlaps with the orthographic projection of the first end battery cell on the first plane; and overlaps with the orthographic projection of the first end battery cell on the first plane; And / or, the surface of the second busbar near the second insulating strip contacts the surface of the second insulating strip near the second busbar; And / or, the dimension of the second busbar along the first direction is smaller than the maximum dimension of the second insulating strip along the first direction; And / or, the maximum dimension of the second insulating strip along the first direction is 2mm to 50mm; And / or, the dimension of the third notch along the first direction is 0.5mm to 20mm; And / or, the second busbar has a dimension of 2mm to 30mm along the first direction.

14. The battery assembly according to claim 10, characterized in that, The battery string in the second end battery string includes a second end battery cell and a second end battery cell adjacent to the second end battery cell; The battery assembly also includes: The third insulating strip overlaps the second end battery piece and the second end battery piece of at least two battery strings in the second end battery string; The third busbar is located on the side of the third insulating strip away from the second end battery cell and the second end battery cell; The third solder strip connects to the second end battery cell, and a portion of the third solder strip is located on the side of the third busbar closer to the first insulating strip; and the third solder strip is connected to the third busbar. The third insulating strip has a fourth notch on the side near the second end of the battery cell; the orthographic projection of the fourth notch on the first plane overlaps with the orthographic projection of the third solder strip on the first plane.

15. The battery assembly according to claim 14, characterized in that, The orthographic projection of the third welding strip on the first plane overlaps with the orthographic projection of the third busbar on the first plane; And / or, the end of the third solder strip away from the second end cell is located within the fourth notch; the orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the fourth notch on the first plane; the orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the third insulating strip on the first plane; And / or, the orthographic projection of the third solder strip on the first plane does not overlap with the orthographic projection of the third insulating strip on the first plane.

16. The battery assembly according to claim 14, characterized in that, The third insulating strip extends along the second direction; the third insulating strip overlaps the second end battery piece and the second end battery piece of all battery strings in the second end battery string; a plurality of fourth notches are provided on the side of the third insulating strip near the second end battery piece; the plurality of fourth notches are spaced apart along the second direction; The third busbar extends along the second direction; the orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the third insulating strip on the first plane; The orthographic projection of the third busbar on the first plane overlaps with the orthographic projection of the fourth notch on the first plane; The plurality of third welding strips are spaced apart along the second direction, and the plurality of third welding strips correspond one-to-one with the plurality of fourth notches; each third welding strip is connected to a second end battery cell, and the end of each third welding strip away from the corresponding second end battery cell is connected to the third busbar; And / or, the fourth notch has a seventh dimension along the second direction, the third weld strip has an eighth dimension along the second direction, and the seventh dimension is greater than or equal to the eighth dimension; And / or, the orthographic projection of the third insulating strip on the first plane overlaps with the orthographic projection of the second end battery cell on the first plane; and overlaps with the orthographic projection of the second end battery cell on the first plane; And / or, the surface of the third busbar near the third insulating strip is in contact with the surface of the third insulating strip near the third busbar; And / or, the dimension of the third busbar along the first direction is smaller than the maximum dimension of the third insulating strip along the first direction; And / or, the maximum dimension of the third insulating strip along the first direction is 2mm to 50mm; And / or, the dimension of the fourth notch along the first direction is 0.5mm to 20mm; And / or, the dimension of the third busbar along the first direction is 2mm to 30mm.

Images