Battery monomer and battery

Abstract

The utility model relates to a battery monomer and a battery. The battery cell comprises: a housing having an accommodating cavity; the first pole is arranged on the shell; the battery cell assembly is accommodated in the accommodating cavity, the battery cell assembly is provided with a first side surface, a second side surface and a third side surface, the first side surface and the third side surface are opposite to each other, the first side surface and the third side surface are both provided with first tabs, and the second side surface faces the first pole; the first adapter piece comprises a first section, a second section and a third section which are connected in sequence, the second section is located between the second side face and the first pole and electrically connected with the first pole, the first section is bent to the first side face relative to the second section and electrically connected with the first tab on the first side face, and the third section is bent to the third side face relative to the second section and electrically connected with the second tab on the third side face. And the second electrode is electrically connected with the first tab on the third side surface.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and a battery. Background Technology

[0002] Lithium-ion batteries have gained widespread attention and are increasingly used in numerous fields due to their advantages such as high voltage, large capacity, long lifespan, low self-discharge rate, and wide operating temperature range. Charging time is crucial for improving user satisfaction and convenience, especially in commercial sectors like taxis, where shorter charging times can significantly improve vehicle operating efficiency and economic benefits. However, existing square aluminum-cased batteries have poor fast-charging performance and cannot meet the demands of fast charging. Utility Model Content

[0003] Therefore, it is necessary to provide a battery cell and battery that can improve fast charging performance and better meet the needs of fast charging, in order to address the above problems.

[0004] On one hand, this application provides a single battery cell, comprising:

[0005] The outer casing has a receiving cavity;

[0006] The first pole post is disposed on the outer casing;

[0007] A battery cell assembly is housed within the receiving cavity. The battery cell assembly has a first side, a second side, and a third side. The first side and the third side are opposite to each other, and both the first side and the third side have a first electrode tab. The second side faces the first electrode post.

[0008] The first adapter plate includes a first segment, a second segment, and a third segment connected in sequence. The second segment is located between the second side and the first pole and is electrically connected to the first pole. The first segment is bent relative to the second segment onto the first side and is electrically connected to the first tab on the first side. The third segment is bent relative to the second segment onto the third side and is electrically connected to the first tab on the third side.

[0009] In some embodiments, the first side has a plurality of first tabs, and the first segment of the first adapter piece is electrically connected to each of the first tabs on the first side; and / or

[0010] The third side has a plurality of first tabs, and the third segment of the first adapter piece is electrically connected to each of the first tabs on the third side.

[0011] In some embodiments, the first adapter piece further includes a first weld portion connected to the first segment, the first weld portion being located on a surface of the first segment opposite to the cell assembly, and the first tab on the first side being welded to the surface of the first weld portion opposite to the first segment; and / or

[0012] The first adapter also includes a second welding portion connected to the third segment, the second welding portion being located on the side surface of the third segment opposite to the cell assembly, and the first tab on the third side surface being welded to the side surface of the second welding portion opposite to the third segment.

[0013] In some embodiments, the battery cell further includes a second terminal post and a second adapter piece, the second terminal post and the first terminal post being disposed on the same side of the housing, the first side and the third side both having second tabs, and the second adapter piece including a fourth segment, a fifth segment and a sixth segment connected in sequence.

[0014] The fifth segment is located between the second side and the second pole and is electrically connected to the second pole. The fourth segment is bent relative to the fifth segment onto the first side and is electrically connected to the second tab on the first side. The sixth segment is bent relative to the fifth segment onto the third side and is electrically connected to the second tab on the third side.

[0015] In some embodiments, the first side has a plurality of second tabs, and the fourth segment of the second adapter piece is electrically connected to each of the second tabs on the first side; and / or

[0016] The third side has a plurality of second tabs, and the sixth segment of the second adapter piece is electrically connected to each of the second tabs on the third side.

[0017] In some embodiments, the second adapter piece further includes a third weld portion connected to the fourth segment, the third weld portion being located on the side surface of the fourth segment opposite to the cell assembly, and the second tab on the first side surface being welded to the side surface of the third weld portion opposite to the fourth segment; and / or

[0018] The second adapter also includes a fourth welding portion connected to the sixth segment, the fourth welding portion being located on the side surface of the sixth segment opposite to the cell assembly, and the second tab on the third side surface being welded to the side surface of the fourth welding portion opposite to the sixth segment.

[0019] In some embodiments, the first side and the third side are respectively the two side surfaces of the cell assembly in a first direction, and the second side is the one side surface of the cell assembly in a second direction intersecting the first direction;

[0020] The battery cell assembly includes a battery cell, which has a first tab and a second tab on both sides in the first direction; or

[0021] The battery cell assembly includes two battery cells stacked along a third direction, which intersects both the first direction and the second direction; each battery cell has a first tab and a second tab on both sides of the first direction; or

[0022] The battery cell assembly includes two layers of battery cell groups stacked along a third direction, which intersects both the first direction and the second direction; each layer of the battery cell group includes two cells arranged along the first direction, and each of the two cells in the same layer of the battery cell group has a first tab and a second tab on its side that is away from each other; or

[0023] The battery cell assembly includes two battery cells arranged along the first direction, and each of the two battery cells has a first tab and a second tab on its side facing away from each other.

[0024] In some embodiments, the housing includes a shell and a cover plate, the shell having an inner cavity as the receiving cavity and an opening communicating with the receiving cavity, and the cover plate covering the opening of the shell;

[0025] The battery cell further includes a first insulating member disposed between the cell assembly and the cover plate. The first insulating member has a first through hole and a second through hole. The second segment and the fifth segment are located between the first insulating member and the cell assembly. The second segment is connected to a fifth welding part, which passes through the first through hole and is welded and fixed to the first electrode post. The fifth segment is connected to a sixth welding part, which passes through the second through hole and is welded and fixed to the second electrode post.

[0026] In some embodiments, the first insulating member has a first groove on the side facing the cell assembly, and the second segment is disposed within the first groove; and / or

[0027] The first insulating member has a second strip groove on the side facing the cell assembly, and the fifth segment is disposed in the second strip groove.

[0028] On the other hand, this application provides a battery including a battery cell as described in any of the above embodiments.

[0029] Compared with the prior art, this application has the following beneficial effects:

[0030] The aforementioned battery cell and battery have first tabs of the same polarity on both the first side and the third side opposite to the first side of the cell assembly, and are electrically connected to the first terminal post via a first adapter piece. In other words, the increased number of first tabs, and the presence of first tabs on different sides of the cell assembly (i.e., the first and third sides), results in a more uniform current density across the cell assembly during charging, which is beneficial for improving the battery's fast-charging performance. Attached Figure Description

[0031] Figure 1 This is an exploded structural diagram of a single battery cell in one embodiment of this application;

[0032] Figure 2 for Figure 1 The diagram shows an exploded view of the battery cell assembly, the first adapter plate, and the second adapter plate.

[0033] Figure 3 for Figure 1 A schematic diagram of the cell assembly of the battery cell shown;

[0034] Figure 4 for Figure 3 The diagram shows the structure of the battery cell assembly from another perspective.

[0035] Figure 5 for Figure 1 The diagram shows the exploded structure of the first and second adapter pieces of the battery cell and the cover plate.

[0036] Figure 6 for Figure 5 The exploded structural diagram of the first and second adapter pieces and the cover plate shown from another perspective;

[0037] Figure 7 This is a schematic diagram of the structure of the battery cell assembly, the first adapter plate, and the second adapter plate in another embodiment of this application;

[0038] Figure 8 for Figure 7 The diagram shows the structure of the first and second adapter pieces.

[0039] Figure 9 This is a schematic diagram of the structure of the battery cell assembly, the first adapter plate, and the second adapter plate in another embodiment of this application;

[0040] Figure 10 for Figure 9The diagram shows the structure of the battery cell assembly, the first adapter plate, and the second adapter plate from another perspective;

[0041] Figure 11 This is a schematic diagram of the structure of the battery cell assembly, the first adapter plate, and the second adapter plate in another embodiment of this application;

[0042] Figure 12 This is a schematic diagram of the structure of the battery cell assembly, the first adapter plate, and the second adapter plate in another embodiment of this application;

[0043] Figure 13 for Figure 12 The diagram shows the structure of the battery cell assembly, the first adapter plate, and the second adapter plate from another perspective. Detailed Implementation

[0044] 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.

[0045] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0046] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] 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 according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0049] It should be noted that when 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. When 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0050] One embodiment of this application provides an electrical device that uses a battery or battery cell as its power source. Specifically, the electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical device.

[0051] A battery comprises a casing and individual battery cells, which are housed within the casing. The casing provides space for the battery cells and can have various structures and shapes, such as a cuboid. A battery may contain multiple individual cells, which can be connected in series, parallel, or a combination thereof. A combination of series and parallel connections refers to multiple battery cells being connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, parallel, or a combination thereof, and then housed within the casing. Alternatively, multiple battery cells can be first connected in series, parallel, or a combination thereof to form a battery module, and then these modules can be connected in series, parallel, or a combination thereof to form a single unit housed within the casing. The battery may also include other structures, such as a busbar for electrical connection between the multiple battery cells. Each battery cell can be a secondary or primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these.

[0052] The specific structure of the battery cell is described in detail below with reference to the accompanying drawings. Please refer to the attached diagram. Figures 1 to 4 In the embodiments of this application, the battery cell includes a casing 10, a first terminal post 131, a cell assembly 20, and a first adapter plate 30. The casing 10 has a receiving cavity 110, in which the cell assembly 20 is received. The first terminal post 131 is disposed on the casing 10, and the cell assembly 20 has a first side 21, a second side 22, and a third side 23. The first side 21 and the third side 23 are opposite to each other, and the second side 22 faces the first terminal post 131. Both the first side 21 and the third side 23 have first tabs 24. It is understood that the polarity of each first tab 24 is the same; they can all be positive tabs, or they can all be negative tabs, as long as the polarity of each first tab 24 is the same, and no special limitation is made here.

[0053] The first adapter piece 30 includes a first segment 31, a second segment 32, and a third segment 33 connected in sequence. The second segment 32 of the first adapter piece 30 is located between the second side surface 22 of the cell assembly 20 and the first terminal 131, and is electrically connected to the first terminal 131. The first segment 31 of the first adapter piece 30 is bent relative to the second segment 32 onto the first side surface 21 of the cell assembly 20, and is electrically connected to the first tab 24 on the first side surface 21. The third segment 33 of the first adapter piece 30 is bent relative to the second segment 32 onto the third side surface 23 of the cell assembly 20, and is electrically connected to the first tab 24 on the third side surface 23, thereby realizing the electrical connection between each of the first tabs 24 on opposite sides of the cell assembly 20 and the first terminal 131, so that the first terminal 131 serves as an electrode terminal of the battery cell to realize the output and input of electrical energy.

[0054] The aforementioned battery cell has first tabs 24 of the same polarity on both the first side 21 and the third side 23 opposite to the first side 21 of the cell assembly 20, and is electrically connected to the first terminal post 131 via a first adapter piece 30. In other words, the increased number of first tabs 24, and their placement on different sides of the cell assembly 20 (i.e., the first side 21 and the third side 23), results in a more uniform current density across the cell assembly 20 during charging, which is beneficial for improving the battery's fast-charging performance.

[0055] Optionally, the first segment 31 and the third segment 33 of the first adapter piece 30 are both bent approximately 90° toward the same side of the second segment 32, that is, the first segment 31 and the third segment 33 of the first adapter piece 30 are approximately perpendicular to the second segment 32. It should be noted that the included angles between the first segment 31 and the third segment 33 of the first adapter piece 30 and the second segment 32 are related to the shape of the cell assembly 20 and can be adjusted according to the shape of the cell assembly 20, and are not limited here.

[0056] It should be noted that the number of first tabs 24 on the first side 21 of the battery cell assembly 20 is not limited to one. For other embodiments, please refer to [link / reference needed]. Figure 9 and Figure 10 As shown, the first side 21 of the battery cell assembly 20 has a plurality of first tabs 24. The first segment 31 of the first adapter piece 30 is electrically connected to each of the first tabs 24 on the first side 21, so that each of the first tabs 24 on the first side 21 is electrically connected to the first terminal 131 through the first adapter piece 30. It can be understood that the number of first tabs 24 on the first side 21 of the battery cell assembly 20 can be 2, 3, 4 or 5, etc., and is not limited here.

[0057] Similarly, the number of first tabs 24 on the third side 23 of the battery cell assembly 20 is not limited to one. In some embodiments, the third side 23 of the battery cell assembly 20 has multiple first tabs 24, and the third segment 33 of the first adapter piece 30 is electrically connected to each of the first tabs 24 on the third side 23, so that each of the first tabs 24 on the third side 23 is electrically connected to the first terminal 131 through the first adapter piece 30. It is understood that the number of first tabs 24 on the third side 23 of the battery cell assembly 20 can be 2, 3, 4, or 5, etc., and is not specifically limited here. The number of first tabs 24 on the first side 21 of the battery cell assembly 20 can be the same as or different from the number of first tabs 24 on the third side 23, and is not specifically limited here.

[0058] Please see Figure 7 and Figure 8As shown, in some embodiments, the first adapter piece 30 further includes a first welding portion a1 connected to the first segment 31, the first welding portion a1 being located on the side surface of the first segment 31 facing away from the cell assembly 20. A first tab 24 on the first side surface 21 is welded to the side surface of the first welding portion a1 facing away from the first segment 31. During assembly, before welding, the first welding portion a1 is connected to one side of the first segment 31 of the first adapter piece 30 and is approximately perpendicular to the first segment 31 of the first adapter piece 30; the first welding portion a1 is then attached to the first tab 24 on the first side surface 21 of the cell assembly 20, and the two attached together are welded to fix them; then, the welded first tab 24 and the first welding portion a1 are bent toward the first segment 31 of the first adapter piece 30 until the side of the first welding portion a1 without the welded tab is attached to the side of the first segment 31 facing away from the cell assembly 20. Thus, the provision of the first welding portion a1 helps reduce the difficulty of welding operations, thereby improving welding quality.

[0059] Optionally, the first welding part a1 and the first segment 31 of the first adapter piece 30 can be integrally formed. Of course, in other embodiments, the first welding part a1 can also be fixedly connected to the first segment 31 of the first adapter piece 30 by welding or other means, which is not particularly limited here.

[0060] It should be noted that the first welding part a1 is not necessary. In some other embodiments, the first welding part a1 is not provided on the first segment 31 of the first adapter piece 30, and the first tab 24 on the first side 21 can be directly welded to the side surface of the first segment 31 facing away from the cell assembly 20.

[0061] In some embodiments, the first adapter piece 30 further includes a second welding portion a2 connected to the third segment 33, the second welding portion a2 being located on the side surface of the third segment 33 facing away from the cell assembly 20. A first tab 24 on the third side surface 23 is welded to the side surface of the second welding portion a2 facing away from the third segment 33. During assembly, before welding, the second welding portion a2 is connected to one side of the third segment 33 of the first adapter piece 30 and is substantially perpendicular to the third segment 33 of the first adapter piece 30; the second welding portion a2 is then attached to the first tab 24 on the third side surface 23 of the cell assembly 20, and the two attached together are welded to secure them; then, the welded first tab 24 and the second welding portion a2 are bent together toward the third segment 33 of the first adapter piece 30 until the side of the second welding portion a2 without the welded tab is attached to the side of the third segment 33 facing away from the cell assembly 20. Thus, the provision of the second welding portion a2 helps reduce the difficulty of welding operations, thereby improving welding quality.

[0062] Optionally, the second welding part a2 and the third segment 33 of the first adapter piece 30 can be integrally formed. Of course, in other embodiments, the second welding part a2 can also be fixedly connected to the third segment 33 of the first adapter piece 30 by welding or other means, which is not particularly limited here.

[0063] It should be noted that the second welding part a2 is not necessary. In some other embodiments, the third segment 33 of the first adapter piece 30 does not have the second welding part a2, and the first electrode tab 24 on the third side 23 can be directly welded to the side surface of the third segment 33 facing away from the cell assembly 20.

[0064] Please see again Figures 1 to 4 In the embodiments of this application, the battery cell further includes a second terminal 133 and a second adapter plate 40. The second terminal 133 and the first terminal 131 are disposed on the same side of the housing 10. The first side 21 and the third side 23 of the cell assembly 20 both have second tabs 25, that is, the first side 21 of the cell assembly 20 has a first tab 24 and a second tab 25, and the third side 23 of the cell assembly 20 also has a first tab 24 and a second tab 25. It is understood that the polarity of each second tab 25 is the same, and the polarity of each first tab 24 is opposite to the polarity of each second tab 25. When the first tab 24 is a positive tab, the second tab 25 is a negative tab; when the first tab 24 is a negative tab, the second tab 25 is a positive tab.

[0065] The second adapter piece 40 includes a fourth segment 41, a fifth segment 42, and a sixth segment 43 connected in sequence. The fifth segment 42 of the second adapter piece 40 is located between the second side 22 of the cell assembly 20 and the second terminal 133, and is electrically connected to the second terminal 133. The fourth segment 41 of the second adapter piece 40 is bent relative to the fifth segment 42 onto the first side 21 of the cell assembly 20, and is electrically connected to the second tab 25 on the first side 21. The sixth segment 43 of the second adapter piece 40 is bent relative to the fifth segment 42 onto the third side 23 of the cell assembly 20, and is electrically connected to the second tab 25 on the third side 23. This achieves electrical connection between the second tabs 25 on opposite sides of the cell assembly 20 and the second terminal 133, so that the second terminal 133 and the first terminal 131 serve as the two electrode terminals of the battery cell, respectively, to jointly realize the output and input of electrical energy. In other words, when the first electrode 24 is the positive electrode and the second electrode 25 is the negative electrode, the first electrode post 131 is the positive electrode post and the second electrode post 133 is the negative electrode post; when the first electrode 24 is the negative electrode and the second electrode 25 is the positive electrode, the first electrode post 131 is the negative electrode post and the second electrode post 133 is the positive electrode post.

[0066] Thus, second tabs 25 of the same polarity are provided on both the first side 21 and the third side 23 opposite to the first side 21 of the cell assembly 20, and are electrically connected to the second terminal 133 through the second adapter piece 40. That is to say, the number of second tabs 25 is increased, and second tabs 25 are provided on different sides of the cell assembly 20 (i.e., the first side 21 and the third side 23), so that the current density of the cell assembly 20 is more uniform in all parts during charging, which is beneficial to improving the fast charging performance of the battery.

[0067] Optionally, the fourth segment 41 and the sixth segment 43 of the second adapter piece 40 are both bent approximately 90° toward the same side of the fifth segment 42, that is, the fourth segment 41 and the sixth segment 43 of the second adapter piece 40 are approximately perpendicular to the fifth segment 42. It should be noted that the included angles between the fourth segment 41 and the sixth segment 43 of the second adapter piece 40 and the fifth segment 42 are related to the shape of the cell assembly 20 and can be adjusted according to the shape of the cell assembly 20, and are not limited here.

[0068] It should be noted that the number of second tabs 25 on the first side 21 of the battery cell assembly 20 is not limited to one. For other embodiments, please refer to [link / reference needed]. Figure 9 and Figure 10 As shown, the first side 21 of the battery cell assembly 20 has multiple second tabs 25. The fourth segment 41 of the second adapter plate 40 is electrically connected to each of the second tabs 25 on the first side 21, so that each of the second tabs 25 on the first side 21 is electrically connected to the second terminal 133 through the second adapter plate 40. It can be understood that the number of second tabs 25 on the first side 21 of the battery cell assembly 20 can be 2, 3, 4 or 5, etc., and is not limited here.

[0069] Similarly, the number of second tabs 25 on the third side 23 of the battery cell assembly 20 is not limited to one. In some embodiments, the third side 23 of the battery cell assembly 20 has multiple second tabs 25, and the sixth segment 43 of the second adapter plate 40 is electrically connected to each of the second tabs 25 on the third side 23, so that each of the second tabs 25 on the third side 23 is electrically connected to the second terminal 133 through the second adapter plate 40. It is understood that the number of second tabs 25 on the third side 23 of the battery cell assembly 20 can be 2, 3, 4, or 5, etc., and is not specifically limited here. The number of second tabs 25 on the first side 21 of the battery cell assembly 20 can be the same as or different from the number of second tabs 25 on the third side 23, and is not specifically limited here.

[0070] Please see again Figure 7 and Figure 8In some embodiments, the second adapter piece 40 further includes a third welding portion a3 connected to the fourth segment 41, the third welding portion a3 being located on the side surface of the fourth segment 41 facing away from the cell assembly 20. The second tab 25 on the first side surface 21 is welded to the side surface of the third welding portion a3 facing away from the fourth segment 41. During assembly, before welding, the third welding portion a3 is connected to one side of the fourth segment 41 of the second adapter piece 40 and is approximately perpendicular to the fourth segment 41 of the second adapter piece 40; the third welding portion a3 is then attached to the second tab 25 on the first side surface 21 of the cell assembly 20, and the two attached together are welded to secure them; then, the welded second tab 25 and the third welding portion a3 are bent together toward the fourth segment 41 of the second adapter piece 40 until the unwelded tab side of the third welding portion a3 is attached to the side of the fourth segment 41 facing away from the cell assembly 20. Thus, the provision of the third welding portion a3 helps reduce the difficulty of welding operations, thereby improving welding quality.

[0071] Optionally, the third welding part a3 and the fourth segment 41 of the second adapter piece 40 can be integrally formed. Of course, in other embodiments, the third welding part a3 can also be fixedly connected to the fourth segment 41 of the second adapter piece 40 by welding or other means, which is not particularly limited here.

[0072] It should be noted that the third welding part a3 is not necessary. In some other embodiments, the third welding part a3 is not provided on the fourth segment 41 of the second adapter piece 40, and the second electrode tab 25 on the first side 21 can be directly welded to the side surface of the fourth segment 41 facing away from the cell assembly 20.

[0073] In some embodiments, the second adapter piece 40 further includes a fourth welding portion a4 connected to the sixth segment 43, the fourth welding portion a4 being located on the side surface of the sixth segment 43 facing away from the cell assembly 20. The second tab 25 on the third side surface 23 is welded to the side surface of the fourth welding portion a4 facing away from the sixth segment 43. During assembly, before welding, the fourth welding portion a4 is connected to one side of the sixth segment 43 of the second adapter piece 40 and is substantially perpendicular to the sixth segment 43 of the second adapter piece 40; the fourth welding portion a4 is then attached to the second tab 25 on the third side surface 23 of the cell assembly 20, and the two attached together are welded to secure them; then, the welded second tab 25 and the fourth welding portion a4 are bent together toward the sixth segment 43 of the second adapter piece 40 until the unwelded tab side of the fourth welding portion a4 is attached to the side of the sixth segment 43 facing away from the cell assembly 20. Thus, the fourth welding portion a4 helps reduce the difficulty of welding operations, thereby improving welding quality.

[0074] Optionally, the fourth welding part a4 and the sixth segment 43 of the second adapter piece 40 can be integrally formed. Of course, in other embodiments, the fourth welding part a4 can also be fixedly connected to the sixth segment 43 of the second adapter piece 40 by welding or other means, which is not particularly limited here.

[0075] It should be noted that the fourth welding part a4 is not necessary. In some other embodiments, the sixth segment 43 of the second adapter piece 40 does not have the fourth welding part a4, and the second electrode tab 25 on the third side 23 can be directly welded to the side surface of the sixth segment 43 facing away from the cell assembly 20.

[0076] Please see Figure 9 and Figure 10 In some embodiments, the first side surface 21 and the third side surface 23 respectively serve as two side surfaces of the battery cell assembly 20 in the first direction X1, and the second side surface 22 serves as one side surface of the battery cell assembly 20 in the second direction X2. The first direction X1 intersects the second direction X2.

[0077] The battery cell assembly 20 includes a battery cell 201, which has at least one first tab 24 and at least one second tab 25 on both sides in the first direction X, such that the first side 21 of the battery cell assembly 20 has at least one first tab 24 and at least one second tab 25, and the second side 22 of the battery cell assembly 20 also has at least one first tab 24 and at least one second tab 25.

[0078] It should be noted that the cell assembly 20 is not limited to the structure described above that includes a single cell 201. For other embodiments, please refer to... Figure 1 and Figure 2 As shown, the battery cell assembly 20 includes two battery cells 201 stacked along a third direction X3, which intersects both the first direction X1 and the second direction X2. Each battery cell 201 has a first tab 24 and a second tab 25 on both sides of the first direction X1, such that the first side 21 of the battery cell assembly 20 has at least two first tabs 24 and at least two second tabs 25, and the second side 22 of the battery cell assembly 20 also has at least two first tabs 24 and at least two second tabs 25. Preferably, the first direction X1, the second direction X2, and the third direction X3 are perpendicular to each other.

[0079] Optionally, on the first side 21 of the battery cell assembly 20, the first tabs 24 of two corresponding batteries 201 are brought together and pre-welded to form a whole. The two first tabs 24 are then welded as a whole to the first segment 31 or the first welding portion a1 of the first adapter piece 30. Of course, in other embodiments, the first tabs 24 of two corresponding batteries 201 on the first side 21 of the battery cell assembly 20 may also be independently welded to the first segment 31 or the first welding portion a1 of the first adapter piece 30, which is not limited here.

[0080] On the third side 23 of the battery cell assembly 20, the first tabs 24 on the corresponding two battery cells 201 are brought together and pre-welded to form a whole. The two first tabs 24 are welded as a whole to the third segment 33 or the second welding part a2 of the first adapter piece 30. Of course, in other embodiments, on the second side 22 of the battery cell assembly 20, the first tabs 24 on the corresponding two battery cells 201 can also be welded separately to the third segment 33 or the second welding part a2 of the first adapter piece 30, which is not limited here.

[0081] Similarly, on the first side 21 of the battery cell assembly 20, the second tabs 25 on the corresponding two battery cells 201 are brought together and pre-welded to form a whole. These two second tabs 25 are then welded as a whole to the fourth segment 41 or the third welding part a3 of the second adapter piece 40. Of course, in other embodiments, the second tabs 25 on the corresponding two battery cells 201 on the first side 21 of the battery cell assembly 20 can also be independently welded to the fourth segment 41 or the third welding part a3 of the second adapter piece 40, which is not limited here.

[0082] On the third side 23 of the cell assembly 20, the second tabs 25 on the corresponding two cells 201 are brought together and pre-welded to form a whole. The two second tabs 25 are welded as a whole to the sixth segment 43 or the fourth welding part a4 of the second adapter piece 40. Of course, in other embodiments, on the second side 22 of the cell assembly 20, the second tabs 25 on the corresponding two cells 201 can also be independently welded to the sixth segment 43 or the fourth welding part a4 of the second adapter piece 40, which is not limited here.

[0083] It should be noted that the cell assembly 20 is not limited to the structure described above that includes two cells 201. For other embodiments, please refer to... Figure 11As shown, the battery cell assembly 20 includes two layers of battery cell groups 26 stacked along a third direction X3. Each layer of battery cell group 26 includes two battery cells 201 arranged along a first direction X1. The two battery cells 201 in the same layer of battery cell group 26 each have a first tab 24 and a second tab 25 on their sides that are far apart from each other, so that the first side 21 of the battery cell assembly 20 has at least two first tabs 24 and at least two second tabs 25, and the second side 22 of the battery cell assembly 20 also has at least two first tabs 24 and at least two second tabs 25.

[0084] It should also be noted that the cell assembly 20 is not limited to the structure described above, which includes four cells 201. For other embodiments, please refer to... Figure 12 and Figure 13 The battery cell assembly 20 includes two battery cells 201 arranged along a first direction X1. Each of the two battery cells 201 has a first tab 24 and a second tab 25 on its side surfaces that are far apart from each other, so that the first side surface 21 of the battery cell assembly 20 has at least one first tab 24 and at least one second tab 25, and the second side surface 22 of the battery cell assembly 20 also has at least one first tab 24 and at least one second tab 25.

[0085] Please see again Figures 1 to 4 In the embodiments of this application, the outer casing 10 includes a housing 11 and a cover plate 13. The housing 11 has an inner cavity serving as the aforementioned receiving cavity 110 and an opening 112 communicating with the receiving cavity 110. The cover plate 13 covers the opening 112 of the housing 11 to seal the opening 112. The battery cell also includes a first insulating member 50 disposed between the cell assembly 20 and the cover plate 13. The first insulating member 50 has a first through hole 51 opposite to the first terminal post 131 and a second through hole 53 opposite to the second terminal post 133. The second segment 32 of the first adapter piece 30 and the fifth segment 42 of the second adapter piece 40 are both located between the first insulating member 50 and the cell assembly 20. A fifth welding part 321 is connected to the second segment 32 of the first adapter piece 30. The fifth welding part 321 passes through the first through hole 51 on the first insulating member 50 and is welded and fixed to the first terminal post 131, thereby realizing the electrical connection between the first adapter piece 30 and the first terminal post 131. A sixth welding part 421 is connected to the fifth segment 42 of the second adapter piece 40. The sixth welding part 421 passes through the second through hole 53 on the first insulating member 50 and is welded and fixed to the second pole post 133, thereby realizing the electrical connection between the second adapter piece 40 and the second pole post 133.

[0086] Please see Figure 5 and Figure 6As shown, the first insulating member 50 has a first strip groove 54 on the side facing the cell assembly 20. The second segment 32 of the first adapter piece 30 is disposed in the first strip groove 54, thereby using the first strip groove 54 to limit the first adapter piece 30, preventing the first adapter piece 30 from deviating from the position of the first insulating member 50 and coming into contact with the second adapter piece 40 to cause a short circuit, which is beneficial to improving the safety of the battery cell.

[0087] Furthermore, the first insulating member 50 has a second strip groove 55 on the side facing the cell assembly 20, and the fifth segment 42 of the second adapter piece 40 is disposed in the second strip groove 55. The second strip groove 55 is used to limit the second adapter piece 40, so as to prevent the second adapter piece 40 from deviating from the position of the first insulating member 50 and contacting the first adapter piece 30 to cause a short circuit, which is beneficial to improving the safety of the battery cell.

[0088] Furthermore, the first insulating member 50 has a first positioning post 56, which is located within the first strip groove 54. The second segment 32 of the first adapter piece 30 has a first positioning hole 323. The first positioning post 56 is positioned and fitted within the first positioning hole 323, thereby achieving the positioning of the first adapter piece 30, ensuring the assembly accuracy of the first adapter piece 30 and the first insulating member 50, further preventing short circuits caused by contact between the first adapter piece 30 and the second adapter piece 40 due to poor positional accuracy, and further improving the safety of the battery cell. It should be noted that in some embodiments, the first positioning post 56 may also be provided on the second segment 32 of the first adapter piece 30, and the first positioning hole 323 may be provided on the first insulating member 50, with the first positioning hole 323 located within the first strip groove 54. As long as the positioning of the first adapter piece 30 can be achieved, it is not limited here.

[0089] Furthermore, the first insulating member 50 has a second positioning post 57, which is located within the second strip groove 55. The fifth segment 42 of the second adapter piece 40 has a second positioning hole 423. The second positioning post 57 is positioned and fitted within the second positioning hole 423, thereby achieving the positioning of the second adapter piece 40, ensuring the assembly accuracy of the second adapter piece 40 and the first insulating member 50, further preventing short circuits caused by contact between the second adapter piece 40 and the first adapter piece 30 due to poor positional accuracy, and further improving the safety of the battery cell. It should be noted that in some embodiments, the second positioning post 57 may also be located on the fifth segment 42 of the second adapter piece 40, and the second positioning hole 423 may be provided on the first insulating member 50, and the second positioning hole 423 may be located within the aforementioned second strip groove 55, as long as the positioning of the second adapter piece 40 can be achieved, it is not limited here.

[0090] 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.

[0091] 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 cell, characterized in that, include: The outer shell (10) has a receiving cavity (110); The first pole post (131) is disposed on the outer casing (10); A battery cell assembly (20) is housed in the receiving cavity (110). The battery cell assembly (20) has a first side (21), a second side (22), and a third side (23). The first side (21) and the third side (23) are opposite to each other, and both the first side (21) and the third side (23) have a first electrode tab (24). The second side (22) faces the first electrode post (131). The first adapter piece (30) includes a first segment (31), a second segment (32) and a third segment (33) connected in sequence. The second segment (32) is located between the second side surface (22) and the first pole post (131) and is electrically connected to the first pole post (131). The first segment (31) is bent relative to the second segment (32) onto the first side surface (21) and is electrically connected to the first tab (24) on the first side surface (21). The third segment (33) is bent relative to the second segment (32) onto the third side surface (23) and is electrically connected to the first tab (24) on the third side surface (23).

2. The battery cell according to claim 1, characterized in that, The first side surface (21) has a plurality of first tabs (24), and the first segment (31) of the first adapter piece (30) is electrically connected to each of the first tabs (24) on the first side surface (21); and / or The third side surface (23) has a plurality of first tabs (24), and the third segment (33) of the first adapter piece (30) is electrically connected to each of the first tabs (24) on the third side surface (23).

3. The battery cell according to claim 1, characterized in that, The first adapter piece (30) further includes a first welding part (a1) connected to the first segment (31), the first welding part (a1) being located on the side surface of the first segment (31) away from the cell assembly (20), and the first tab (24) on the first side surface (21) being welded to the side surface of the first welding part (a1) away from the first segment (31). and / or The first adapter piece (30) also includes a second welding part (a2) connected to the third segment (33), the second welding part (a2) being located on the side surface of the third segment (33) away from the cell assembly (20), and the first tab (24) on the third side surface (23) being welded to the side surface of the second welding part (a2) away from the third segment (33).

4. The battery cell according to claim 1, characterized in that, The battery cell also includes a second terminal (133) and a second adapter piece (40). The second terminal (133) and the first terminal (131) are disposed on the same side of the outer casing (10). The first side (21) and the third side (23) each have a second tab (25). The second adapter piece (40) includes a fourth segment (41), a fifth segment (42) and a sixth segment (43) connected in sequence. The fifth segment (42) is located between the second side (22) and the second pole post (133) and is electrically connected to the second pole post (133). The fourth segment (41) is bent relative to the fifth segment (42) onto the first side (21) and is electrically connected to the second tab (25) on the first side (21). The sixth segment (43) is bent relative to the fifth segment (42) onto the third side (23) and is electrically connected to the second tab (25) on the third side (23).

5. The battery cell according to claim 4, characterized in that, The first side surface (21) has a plurality of second tabs (25), and the fourth segment (41) of the second adapter piece (40) is electrically connected to each of the second tabs (25) on the first side surface (21); and / or The third side (23) has a plurality of second tabs (25), and the sixth segment (43) of the second adapter piece (40) is electrically connected to each of the second tabs (25) on the third side (23).

6. The battery cell according to claim 4, characterized in that, The second adapter piece (40) further includes a third welding portion (a3) ​​connected to the fourth segment (41), the third welding portion (a3) ​​being located on the side surface of the fourth segment (41) opposite to the cell assembly (20), and the second electrode tab (25) on the first side surface (21) being welded to the side surface of the third welding portion (a3) ​​opposite to the fourth segment (41); and / or The second adapter piece (40) also includes a fourth welding part (a4) connected to the sixth segment (43), the fourth welding part (a4) being located on the side surface of the sixth segment (43) away from the cell assembly (20), and the second tab (25) on the third side surface (23) being welded to the side surface of the fourth welding part (a4) away from the sixth segment (43).

7. The battery cell according to claim 4, characterized in that, The first side surface (21) and the third side surface (23) are respectively the two side surfaces of the cell assembly (20) in the first direction (X1), and the second side surface (22) is the one side surface of the cell assembly (20) in the second direction (X2) intersecting with the first direction (X1); The battery cell assembly (20) includes a battery cell (201), which has a first tab (24) and a second tab (25) on both sides in the first direction (X1); or The battery cell assembly (20) includes two battery cells (201) stacked along a third direction (X3), which intersects both the first direction (X1) and the second direction (X2); each battery cell (201) has a first tab (24) and a second tab (25) on both sides of the first direction (X1); or The battery cell assembly (20) includes two layers of battery cell groups (26) stacked along a third direction (X3), which intersects both the first direction (X1) and the second direction (X2); each layer of the battery cell group (26) includes two battery cells (201) arranged along the first direction (X1), and each of the two battery cells (201) in the same layer of the battery cell group (26) has a first tab (24) and a second tab (25) on the side facing away from each other; or The battery cell assembly (20) includes two battery cells (201) arranged along the first direction (X1), and each of the two battery cells (201) has a first tab (24) and a second tab (25) on its side facing away from each other.

8. The battery cell according to claim 4, characterized in that, The outer casing (10) includes a housing (11) and a cover plate (13). The housing (11) has an inner cavity that serves as the receiving cavity (110) and an opening (112) communicating with the receiving cavity (110). The cover plate (13) covers the opening (112) of the housing (11). The battery cell further includes a first insulating member (50) disposed between the cell assembly (20) and the cover plate (13). The first insulating member (50) has a first through hole (51) and a second through hole (53). The second segment (32) and the fifth segment (42) are located between the first insulating member (50) and the cell assembly (20). A fifth welding part (321) is connected to the second segment (32). The fifth welding part (321) passes through the first through hole (51) and is welded and fixed to the first pole post (131). A sixth welding part (421) is connected to the fifth segment (42). The sixth welding part (421) passes through the second through hole (53) and is welded and fixed to the second pole post (133).

9. The battery cell according to claim 8, characterized in that, The first insulating member (50) has a first groove (54) on the side facing the cell assembly (20), and the second segment (32) is disposed within the first groove (54); and / or The first insulating member (50) has a second strip groove (55) on the side facing the cell assembly (20), and the fifth segment (42) is disposed in the second strip groove (55).

10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

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