Battery cell and electric device

Abstract

The embodiment of the invention provides a battery cell and a power utilization device. The battery cell comprises an electrode assembly, a first adapter and a second adapter. The electrode assembly is of a laminated structure and comprises a plurality of first pole pieces and a plurality of second pole pieces which are arranged in a laminated mode in the first direction, the polarity of the first pole pieces is opposite to that of the second pole pieces, each first pole piece is provided with a first notch, each second pole piece is provided with a second notch, and the first notches and the second notches are not overlapped when observed in the first direction. Each first pole piece is provided with a first area exposed to the second notch, and each second pole piece is provided with a second area exposed to the first notch. The first adapter is electrically connected with the first areas of the plurality of first pole pieces. And the second adapter is electrically connected with the second areas of the plurality of second pole pieces. The first adapter piece comprises a first adapter part, and the first adapter part penetrates through the plurality of first areas so as to connect the first adapter piece with the plurality of first pole pieces. According to the technical scheme of the embodiment of the invention, the energy density of the battery cell can be improved.

Description

[0001] This application is a divisional application based on the invention with application number 202410245306.7, application date March 4, 2024, applicant Ningde New Energy Technology Co., Ltd., and invention title "Battery Cell and Power Consumption Device". Technical Field

[0002] This application relates to the field of battery cell technology, and more specifically, to a battery cell and an electrical device. Background Technology

[0003] Laminated cells are widely used in the lithium-ion battery field due to their high energy density, low internal resistance, and long lifespan. The fabrication process of laminated cells requires the use of die-cutting or laser-cutting techniques to form the electrode sheets. This cutting technology necessitates cutting specific shapes of tabs from pre-reserved empty foil areas, leading to waste of excess material and potentially affecting equipment precision during powder generation and cleaning. The multiple layers of tabs need to be connected by bonding, resulting in gaps between the electrode assembly and the casing (or packaging bag), reducing energy density. Summary of the Invention

[0004] This application provides a battery cell and an electrical device that can improve the energy density of the battery cell.

[0005] This application is achieved through the following technical solution: In a first aspect, embodiments of this application provide a battery cell, which includes an electrode assembly, a first adapter, and a second adapter. The electrode assembly has a stacked structure, comprising a plurality of first electrode sheets and a plurality of second electrode sheets stacked along a first direction. The first electrode sheets and second electrode sheets have opposite polarities. Each first electrode sheet has a first notch, and each second electrode sheet has a second notch. When viewed along the first direction, the first notch and the second notch do not overlap. Each first electrode sheet has a first region exposed to the second notch, and each second electrode sheet has a second region exposed to the first notch. The first adapter is electrically connected to the first region of the plurality of first electrode sheets. The second adapter is electrically connected to the second region of the plurality of second electrode sheets. The first adapter includes a first adapter portion that passes through the plurality of first regions to connect the first adapter to the plurality of first electrode sheets.

[0006] According to the battery cell of this application embodiment, a first notch is provided on the first electrode, and a second notch is provided on the second electrode. A first region is exposed to the second notch, and a second region is exposed to the first notch. This allows for the addition of corresponding active materials in the vicinity of the first region and the vicinity of the second region, respectively. This makes reasonable use of the internal space of the battery cell, increases the content of active materials, and thereby improves the energy density of the battery cell. The provision of the first adapter portion enables a firm connection between the multiple first electrodes and the first adapter.

[0007] In one or more of the above optional embodiments, the first notch is located at the first corner of the first electrode, and the first region is located at the second corner of the first electrode; the second notch is located at the third corner of the second electrode, and the second region is located at the fourth corner of the second electrode.

[0008] In the above scheme, the first gap is located at the first corner, the second region is exposed to the first gap, and the first region is located at the second corner. This facilitates processing and manufacturing, and also allows for a larger gap between the first region and the second region, reducing the risk of short circuit between the first region and the second region.

[0009] In one or more of the above optional embodiments, the first corner position and the second corner position are two adjacent corner positions of the first electrode; the third corner position and the fourth corner position are two adjacent corner positions of the second electrode.

[0010] In the above scheme, the first corner position and the second corner position are two adjacent corner positions of the first electrode plate, and the third corner position and the fourth corner position are two adjacent corner positions of the second electrode plate. The first region and the second region can be located on the same side of the electrode assembly, which facilitates connection with other components and facilitates assembly.

[0011] In one or more of the above optional embodiments, a first filling layer is provided between two adjacent first regions.

[0012] In the above solution, the first filling layer reduces the convergence angle between two adjacent first regions, allowing the size of the first region to be smaller and reducing its space occupation, thereby improving energy density. Furthermore, since the convergence area is located at a corner, and the electrode has a notch at the corner, without a filling layer, there would be a significant thickness difference between the corner of the electrode and the area of ​​the main body where the active material is located. This could lead to the risk of tearing at the edge connecting to the main body when the first region converges.

[0013] In one or more of the above optional embodiments, the first filling layer is a first active material layer.

[0014] In the above scheme, the two adjacent first regions do not need to remove the active material, which facilitates processing and manufacturing.

[0015] In one or more of the above optional embodiments, the first filler layer is an insulating layer.

[0016] In the above scheme, the first filling layer is an insulating layer, which fills the gap between two adjacent first regions on the one hand, and reduces the risk of short circuit between the anode and cathode on the other hand.

[0017] In one or more of the above optional embodiments, the first electrode includes a first coated area with a first active material and a first empty foil area without the first active material. The first area is the first empty foil area, the first filling layer is a conductive layer, and two adjacent first areas are electrically connected through the first filling layer.

[0018] In the above scheme, the first filling layer is a conductive layer, and two adjacent first regions are electrically connected through the conductive layer. On the one hand, it fills the gap between the two adjacent first regions, and on the other hand, it increases the current carrying capacity of the two adjacent first regions.

[0019] In one or more of the above optional embodiments, the first filler layer is a conductive adhesive or a soldering agent.

[0020] In the above scheme, the first filling layer is a conductive adhesive or welding agent, which can improve the connection strength between two adjacent first regions and improve the electrical connection stability between two adjacent first regions.

[0021] In one or more of the above optional embodiments, a first through hole is provided in the first region, and the first adapter includes a first riveting part, which passes through the first through hole to rivet the first adapter to a plurality of first pole pieces.

[0022] In the above scheme, the first riveting part is provided through the first through hole to rivet the first adapter to multiple first pole pieces, so that the multiple first pole pieces are firmly connected to the first adapter and are easy to process and manufacture.

[0023] In one or more of the above optional embodiments, the first electrode includes a first current collector, the first current collector includes a first body and a first protrusion, the first protrusion protrudes from one side of the first body in the thickness direction, and the first protrusion is disposed circumferentially along the first through hole.

[0024] In the above scheme, the first protrusion is arranged circumferentially along the first through hole. The first protrusion contacts the first riveting part, which can increase the connection area between the first current collector and the first riveting part, thereby increasing the current flow capacity between the first electrode and the first riveting part.

[0025] In one or more of the above optional embodiments, the first electrode includes a first coating area provided with a first active material, and the first region is a part of the first coating area; or, the first electrode includes a first coating area provided with a first active material and a first empty foil area not provided with the first active material, and the first region is the first empty foil area.

[0026] In the above scheme, the first region is part of the first coating area, which facilitates processing and manufacturing. The first region is also a first empty foil area, which facilitates electrical connection between multiple first regions.

[0027] In one or more of the above optional embodiments, the electrode assembly further includes a diaphragm disposed between adjacent first and second electrodes, the diaphragm having a third notch that at least partially overlaps with the first notch and a fourth notch that at least partially overlaps with the second notch.

[0028] In the above scheme, the diaphragm reduces the risk of short circuit between the anode and cathode, the third notch facilitates electrical connection between multiple second regions, and the fourth notch facilitates electrical connection between multiple first regions.

[0029] In one or more of the above optional embodiments, the battery cell further includes a packaging bag, an electrode assembly disposed inside the packaging bag, one end of a first adapter electrically connected to a first region of a plurality of first electrodes, and the other end of the first adapter extending out of the packaging bag; one end of a second adapter electrically connected to a second region of a plurality of second electrodes, and the other end extending out of the packaging bag.

[0030] In the above scheme, the electrode assembly is placed inside the packaging bag, and the battery cell can have a high energy density; the other end of the first adapter extends out of the packaging bag, and the other end of the second adapter extends out of the packaging bag to facilitate electrical connection with other components.

[0031] In one or more of the above optional embodiments, the battery cell further includes a housing, a first electrode terminal, and a second electrode terminal. The first electrode terminal and the second electrode terminal are both disposed in the housing. One end of the first adapter is electrically connected to a first region of a plurality of first electrodes, and the other end of the first adapter is electrically connected to the first electrode terminal. One end of the second adapter is electrically connected to a second region of a plurality of second electrodes, and the other end of the second adapter is electrically connected to the second electrode terminal.

[0032] In the above scheme, the first adapter is electrically connected to the first electrode terminal, and the second adapter is electrically connected to the second electrode terminal, so as to facilitate the discharge of electrical energy from the electrode assembly.

[0033] In one or more of the above optional embodiments, the battery cell further includes a housing and a first electrode terminal, the first electrode terminal being insulated from the housing, one end of a first adapter being electrically connected to a first region of a plurality of first electrodes, the other end of the first adapter being electrically connected to the first electrode terminal, one end of a second adapter being electrically connected to a second region of a plurality of second electrodes, and the other end of the second adapter being electrically connected to the housing.

[0034] In the above scheme, the first adapter is electrically connected to the first electrode terminal, and the second adapter is electrically connected to the housing, so as to facilitate the discharge of electrical energy from the electrode assembly.

[0035] Secondly, embodiments of this application also provide an electrical device, which includes a battery cell as provided in any of the above embodiments.

[0036] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram illustrating the assembly of the electrode assembly with the first adapter and the second adapter provided in some embodiments of this application. Figure 2 This is a schematic diagram of the structure of the first electrode provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the first electrode provided in other embodiments of this application; Figure 4 This is a schematic diagram of the structure of the second electrode provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of the second electrode provided in other embodiments of this application; Figure 6 This is a schematic diagram of the assembly of a first adapter and multiple first regions provided in some embodiments of this application; Figure 7 This is a schematic diagram illustrating the interaction between the first filling layer and the first region in some embodiments of this application; Figure 8 A partial structural schematic diagram of the electrode assembly and the first adapter provided in some embodiments of this application; Figure 9 This is a schematic diagram of the assembly of the second adapter and multiple second regions provided in some embodiments of this application; Figure 10 A partial structural schematic diagram of the electrode assembly and the second adapter provided in some embodiments of this application; Figure 11 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 12 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application; Figure 13 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0039] Icons: 100 - Battery cell; 10 - Electrode assembly; 11 - First electrode; 11a - First corner; 11b - Second corner; 111 - First region; 111a - First through hole; 112 - First notch; 113 - First coating area; 114 - First empty foil area; 115 - First current collector; 1151 - First body; 1152 - First protrusion; 1153 - First surface; 12 - Second electrode; 12a - Third corner; 12b - Fourth corner; 121 - Second region; 121a - Third through hole; 122 - Second notch; 123 - Second coating area; 124 - Second empty foil area; 125-Second current collector; 1251-Second body; 1252-Second protrusion; 1253-Second surface; 13-First filling layer; 14-Second filling layer; 20-First adapter; 21-First riveting part; 22-First connecting part; 221-Second through hole; 30-Second adapter; 31-Second riveting part; 32-Second connecting part; 321-Fourth through hole; 40-Diaphragm; 41-Third notch; 42-Fourth notch; 50-Packaging bag; 60-Outer shell; 71-First electrode terminal; 72-Second electrode terminal; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0042] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0045] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0046] The structure of the battery cell according to an embodiment of this application is described below with reference to the accompanying drawings.

[0047] Please refer to Figure 1 This application provides a battery cell 100, which includes an electrode assembly 10, a first adapter 20, and a second adapter 30.

[0048] The electrode assembly 10 has a stacked structure, comprising a plurality of first electrode plates 11 and a plurality of second electrode plates 12 stacked along a first direction X, wherein the first electrode plates 11 and the second electrode plates 12 have opposite polarities. The first electrode plate 11 can be a cathode electrode plate and the second electrode plate 12 can be an anode electrode plate; or, the first electrode plate 11 can be an anode electrode plate and the second electrode plate 12 can be a cathode electrode plate.

[0049] Each first electrode 11 has a first region 111, and each second electrode 12 has a second notch 122. When viewed along the first direction X, the first region 111 is exposed to the second notch 122.

[0050] Each second electrode 12 has a second region 121, and each first electrode 11 has a first notch 112. When viewed along the first direction X, the second region 121 is exposed to the first notch 112.

[0051] Observing along the first direction X, the first gap 112 and the second gap 122 do not overlap, so that the first region 111 and the second region 121 do not overlap, reducing the risk of short circuit between the anode and cathode.

[0052] The first adapter 20 is electrically connected to the first region 111 of the plurality of first electrodes 11, and the first adapter 20 is electrically connected to all the first regions 111, so as to realize the electrical connection between the first adapter 20 and the plurality of first electrodes 11.

[0053] The first adapter 20 includes a first adapter portion that passes through a plurality of first regions 111 to connect the first adapter 20 to a plurality of first electrodes 11.

[0054] In some embodiments, the first region 111 is provided with a hole through which the first adapter portion passes, a portion of the first adapter portion is disposed in the hole, and the first adapter portion is connected to a plurality of first regions 111, thereby realizing the connection between the first adapter 20 and a plurality of first electrode plates 11.

[0055] The first transition section can be a structure such as a pin or a riveting post.

[0056] The second adapter 30 is electrically connected to the second region 121 of the plurality of second electrodes 12, and the second adapter 30 is electrically connected to all the second regions 121, so as to realize the electrical connection between the second adapter 30 and the plurality of second electrodes 12.

[0057] The second adapter 30 includes a second adapter portion that passes through a plurality of second regions 121 to connect the second adapter 30 to a plurality of second pole pieces 12.

[0058] In some embodiments, the second region 121 is provided with a hole through which the second adapter portion passes, a portion of the second adapter portion is disposed in the hole, and the second adapter portion is connected to a plurality of second regions 121, thereby realizing the connection between the second adapter 30 and a plurality of second electrodes 12.

[0059] The second transition section can be a structure such as a pin or a riveting part.

[0060] In this application, the first region 111 is exposed at the second notch 122, and the second region 121 is exposed at the first notch 112. This allows the first active material to be disposed in the region of the first electrode 11 adjacent to the first region 111, and the second active material to be disposed in the region of the second electrode 12 adjacent to the second region 121. This enables the first electrode 11 to be disposed with a greater amount of the first active material and the second electrode 12 to be disposed with a greater amount of the second active material, thus making reasonable use of the internal space of the cell 100, increasing the content of active material, and thereby increasing the energy density of the cell 100.

[0061] Please refer to Figure 2 and Figure 3 In one or more of the above optional embodiments, the first notch 112 is located at the first corner 11a of the first electrode 11, and the first region 111 is located at the second corner 11b of the first electrode 11.

[0062] The first notch 112 is located at the first corner 11a, the first region 111 is located at the second corner 11b, and the second region 121 is exposed to the first notch 112. Viewed along the first direction X, the projection of the second region 121 and the first region 111 are located at the two corners of the first electrode 11, and there is a significant distance between the projection of the second region 121 and the first region 111, reducing the risk of short circuit between them. Simultaneously, the first notch 112 being located at the first corner 11a facilitates manufacturing.

[0063] Please refer to Figure 4 and Figure 5 In some embodiments, the second notch 122 is located at the triangular position 12a of the second electrode 12, and the second region 121 is located at the fourth corner position 12b of the second electrode 12.

[0064] The second notch 122 is located at the third corner 12a, and the second region 121 is located at the fourth corner 12b. The first region 111 is exposed to the second notch 122. When viewed along the first direction X, the projection of the first region 111 and the second region 121 are located at the two corners of the second electrode 12. There is a large distance between the projection of the first region 111 and the second region 121, reducing the risk of short circuit between the first region 111 and the second region 121. At the same time, the second notch 122 is located at the third corner 12a, which facilitates processing and manufacturing.

[0065] Please refer to Figure 2 and Figure 3 In one or more of the above optional embodiments, the first corner position 11a and the second corner position 11b are two adjacent corner positions of the first pole piece 11.

[0066] The first corner position 11a and the second corner position 11b are two adjacent corner positions of the first electrode 11. The first region 111 and the second region 121 can be located on the same side of the electrode assembly 10 to facilitate connection with other components and facilitate assembly.

[0067] In some embodiments, the first corner 11a and the second corner 11b are located at both ends of the first electrode 11 in the second direction Y. Alternatively, the first corner 11a and the second corner 11b are located at both ends of the first electrode 11 in the third direction Z. The second direction Y, the third direction Z, and the first direction X are all perpendicular to each other.

[0068] In some embodiments, the second direction Y can be parallel to the width direction of the first electrode 11, and the third direction Z can be parallel to the length direction of the first electrode 11. Alternatively, the second direction Y can be parallel to the length direction of the first electrode 11, and the third direction Z can be parallel to the width direction of the first electrode 11.

[0069] Please refer to Figure 4 and Figure 5In some embodiments, the third corner position 12a and the fourth corner position 12b are two adjacent corner positions of the second pole piece 12.

[0070] The third corner position 12a and the fourth corner position 12b are two adjacent corner positions of the second electrode 12. The first region 111 and the second region 121 can be located on the same side of the electrode assembly 10, which facilitates connection with other components and facilitates assembly.

[0071] In some embodiments, the third corner 12a and the fourth corner 12b are located at both ends of the second electrode 12 in the second direction Y. Alternatively, the third corner 12a and the fourth corner 12b are located at both ends of the second electrode 12 in the third direction Z.

[0072] Please refer to Figure 2 and Figure 3 and further refer to Figure 6 In one or more of the above optional embodiments, a first filling layer 13 is provided between two adjacent first regions 111.

[0073] The thickness of the first filling layer 13 can be equal to the distance between two adjacent first regions 111.

[0074] The first filling layer 13 fills the space between two adjacent first regions 111. The first filling layer 13 can support the first region 111, so that the two adjacent first regions 111 can be arranged in parallel, reducing the angle between the two adjacent first regions 111, so that the size of the first region 111 can be smaller, reducing the assembly space occupied by the first region 111, so as to improve the energy density of the cell 100.

[0075] In addition, when the first region 111 is located at the second corner 11b of the first electrode 11, the second notch 122 is provided at the third triangular position 12a of the second electrode 12. If the first filling layer 13 is not provided, there is a large thickness difference between the second corner 11b of the first electrode 11 and the main body position (the area of ​​the first electrode 11 other than the corner position). When the first region 111 is closed, there is a risk that the edge connecting the first region 111 and the main body position may be torn.

[0076] In one or more of the above optional embodiments, the first filling layer 13 is an insulating layer.

[0077] The first filling layer 13 is an insulating layer. On the one hand, it fills the gap between two adjacent first regions 111. On the other hand, when the first electrode 11 is a cathode electrode, the insulating layer can shield metal ions. When the cell 100 is a lithium-ion cell, it can reduce the risk of lithium plating.

[0078] During the manufacturing process of the cell 100, before the first electrode 11 and the second electrode 12 are stacked, an insulating layer is provided at the first region 111 of the first electrode 11. After multiple first electrodes 11 and multiple second electrodes 12 are stacked, the insulating layer between two adjacent first regions 111 forms a first filling layer 13.

[0079] In some embodiments, after the first adapter 20 is engaged with a plurality of first electrodes 11, the plurality of first electrodes 11 have end first electrodes located at one end of the plurality of first electrodes 11 in a first direction X, and an insulating layer is provided between the first adapter 20 and the end first electrodes to reduce the deposition of metal ions.

[0080] Please refer to Figure 7 In one or more of the above optional embodiments, the first electrode 11 includes a first coating area 113 on which a first active material is disposed and a first empty foil area 114 on which no first active material is disposed. The first area 111 is the first empty foil area 114, the first filling layer 13 is a conductive layer, and two adjacent first areas 111 are electrically connected through the first filling layer 13.

[0081] The first empty foil area 114 is connected to the first coated area 113. The first current collector of the first empty foil area 114 and the first current collector of the first coated area 113 can be integrally formed. The first empty foil area 114 extends from the first coated area 113.

[0082] The first filling layer 13 is a conductive layer. Two adjacent first regions 111 are electrically connected through the conductive layer, which fills the gap between the two adjacent first regions 111 on the one hand, and increases the current carrying capacity of the two adjacent first regions 111 on the other hand.

[0083] During the manufacturing process of the battery cell 100, before the first electrode 11 and the second electrode 12 are stacked, a conductive layer is provided at the first region 111 of the first electrode 11. After multiple first electrodes 11 and multiple second electrodes 12 are stacked, the conductive layer between two adjacent first regions 111 forms a first filling layer 13.

[0084] In some embodiments, after the first adapter 20 is engaged with a plurality of first electrodes 11, the plurality of first electrodes 11 have end first electrodes located at one end of the plurality of first electrodes 11 in a first direction X, and a conductive layer is provided between the first adapter 20 and the end first electrodes to facilitate electrical connection between the first adapter 20 and the plurality of first regions 111.

[0085] In one or more of the above optional embodiments, the first filler layer 13 is a conductive adhesive or a soldering agent.

[0086] The first filler layer 13 is a conductive adhesive or welding agent, which can improve the connection strength between two adjacent first regions 111 and improve the electrical connection stability between two adjacent first regions 111.

[0087] In some embodiments, the soldering agent may be solder paste, which is disposed between two adjacent first regions 111 to facilitate soldering of the plurality of first regions 111.

[0088] In one or more of the above optional embodiments, the first region 111 is provided with a first through hole, and the first adapter is disposed in the first through hole to rivet the first adapter 20 to a plurality of first electrode plates 11.

[0089] In some embodiments, the first adapter 20 may further include a first connecting portion connected between the first adapter portion and the electrode terminal (or housing), the first connecting portion enabling the connection between the first adapter portion and the electrode terminal (or housing).

[0090] Please refer to Figure 2 , Figure 3 and Figure 6 In one or more of the above optional embodiments, the first region 111 is provided with a first through hole 111a, and the first adapter includes a first riveting part 21, which passes through the first through hole 111a to rivet the first adapter 20 to a plurality of first electrode plates 11.

[0091] The first through hole 111a penetrates the first region 111 along the thickness direction of the first electrode 11.

[0092] In some embodiments, the first adapter 20 further includes a first connecting portion 22, which can be a separate structure or an integral structure with the first riveting portion 21. When the first connecting portion 22 and the first riveting portion 21 are separate structures, the first connecting portion 22 and the first riveting portion 21 are connected and fixed; when the first connecting portion 22 and the first riveting portion 21 are an integral structure, the first connecting portion 22 and the first riveting portion 21 can be integrally formed.

[0093] A first flange is formed at one end of the first riveting portion 21. When viewed along the first direction X, the projection of the first flange falls into the first region 111, thereby restricting the separation of the first riveting portion 21 from the first region 111 in the opposite direction of the riveting direction. The first connecting portion 22 and the first flange are respectively located at both ends of the plurality of first regions 111 in the first direction X, thereby restricting the separation of the first riveting portion 21 from the first region 111.

[0094] In some embodiments, the first connecting portion 22 may be disposed at one end of the plurality of first regions 111 in the first direction X, and the first connecting portion 22 is connected to the integral structure formed by the plurality of first regions 111. For example, please refer to Figure 6 and Figure 8 The first connecting part 22 may be provided with a second through hole 221, and the first riveting part 21 may pass through the second through hole 221 and be connected to the first connecting part 22. The first connecting part 22 may be welded to the first region 111 located at the end of the plurality of first regions 111.

[0095] In the above scheme, the first riveting part 21 passes through the first through hole 111a to rivet the first adapter 20 to the plurality of first pole pieces 11, so that the plurality of first pole pieces 11 are firmly connected to the first adapter 20, which is convenient for processing and manufacturing.

[0096] In an embodiment where a first filling layer 13 is provided between two adjacent first regions 111, the first riveting portion 21 penetrates the first filling layer 13.

[0097] Please refer to Figure 8 In one or more of the above optional embodiments, the first electrode 11 includes a first current collector 115, the first current collector 115 includes a first body 1151 and a first protrusion 1152, the first protrusion 1152 protrudes from one side of the first body 1151 in the thickness direction, and the first protrusion 1152 is arranged circumferentially along the first through hole 111a.

[0098] A first through hole 111a is provided in the first body 1151, extending through the first body 1151 along the first direction X. The first body 1151 has a first surface 1153, which is located on one side of the thickness direction of the first body 1151, and the thickness direction of the first body 1151 can be parallel to the first direction X. A first protrusion 1152 protrudes from the first surface 1153 and is arranged circumferentially along the first through hole 111a. The first protrusion 1152 can be fitted onto the outside of the first riveting part 21 and contacts the first riveting part 21.

[0099] The first protrusion 1152 can be integrally formed with the first body 1151. For example, the first current collector 115 is stamped to form the first body 1151 and the first protrusion 1152. Alternatively, the first protrusion 1152 can be a separate structure from the first body 1151, with the first protrusion 1152 welded to the first body 1151.

[0100] In the above scheme, the first protrusion 1152 is arranged circumferentially along the first through hole 111a. The first protrusion 1152 contacts the first riveting part 21, which can increase the connection area between the first current collector 115 and the first riveting part 21, thereby increasing the current flow capacity between the first electrode 11 and the first riveting part 21.

[0101] In some embodiments, the first protrusion 1152 may be formed by the first riveting part 21 passing through the first current collector 115 to form a first through hole 111a. For example, when a first active material is provided on the first current collector 115 to form a first coating area 113, an annular empty foil area is formed on the first current collector 115. When the first riveting part 21 cooperates with a plurality of first areas, the first riveting part 21 squeezes the first current collector 115 located in the annular empty foil area and passes through the first current collector 115 to form a first through hole 111a, and forms a first protrusion 1152 on one side of the thickness direction of the first current collector 115.

[0102] Please refer to Figure 2 In one or more of the above optional embodiments, the first electrode 11 includes a first coating area 113 on which a first active material is disposed, and the first region 111 is a part of the first coating area 113.

[0103] During the manufacturing process of the first electrode 11, the first active material is coated on the surface of the first current collector 115 to form the first coating area 113, and the first region 111 is part of the first coating area 113, which simplifies the processing steps and eliminates the need to set up a separate empty foil area.

[0104] When the first electrode 11 is a cathode electrode, a first filling layer 13 can be provided between two adjacent first regions 111. The first filling layer 13 is an insulating layer. The insulating layer shields the first active material in the first region 111, thereby reducing the risk of lithium plating in the lithium-ion cell.

[0105] In the above scheme, the first region 111 is part of the first coating region 113, which facilitates processing and manufacturing.

[0106] In one or more of the above optional embodiments, the first filling layer 13 is a first active material layer.

[0107] For example, when the first region 111 is part of the first coating region 113, the first region 111 is provided with a first through hole 111a, and the first adapter 20 includes a first riveting part 21, which passes through the first through hole 111a to rivet the first adapter 20 to a plurality of first electrode sheets 11. A first filling layer 13 is provided between two adjacent first regions 111, and the first filling layer 13 is a first active material.

[0108] During the manufacturing process of the first electrode 11, the first through hole 111a can be opened only in the first region 111, without removing the active material in the first region 111 and setting other fillers, thus reducing the difficulty of the process.

[0109] The first region 111 is part of the first coating region 113, which facilitates processing and manufacturing. The first filling layer 13 is the first active material layer, which enables the battery cell 100 to have a high energy density.

[0110] In one or more of the above optional embodiments, the first electrode 11 includes a first coated area 113 on which a first active material is disposed and a first empty foil area 114 on which no first active material is disposed, wherein the first area 111 is the first empty foil area 114.

[0111] During the manufacturing process of the first electrode 11, a first active material is coated on the surface of the first current collector 115 to form a first coating area 113, and the uncoated portion of the first current collector 115 forms a first region 111.

[0112] In the above scheme, the first region 111 is the first empty foil region 114, which facilitates the electrical connection between multiple first regions 111.

[0113] In the manufacturing process of the battery cell, the manufacturing method of the second electrode 12 can be the same as that of the first electrode 11. The structure of the second electrode 12 can be the same as or different from that of the first electrode 11.

[0114] Please refer to Figure 9 In some embodiments, a second filling layer 14 is provided between two adjacent second regions 121.

[0115] The thickness of the second filler layer 14 can be equal to the distance between two adjacent second regions 121.

[0116] The second filling layer 14 fills the space between two adjacent second regions 121. The second filling layer 14 can support the second region 121, so that the two adjacent second regions 121 can be arranged in parallel, reducing the angle of convergence of the two adjacent second regions 121, so that the size of the second region 121 can be smaller, reducing the assembly space occupied by the second region 121, so as to improve the energy density of the cell.

[0117] In addition, when the second region 121 is located at the fourth corner 12b of the second electrode 12, the first corner 11a of the first electrode 11 is provided with a first notch 112. If the second filling layer 14 is not provided, there is a large thickness difference between the fourth corner 12b of the second electrode 12 and the main body position (the area of ​​the second electrode 12 other than the corner). When the second region 121 is closed, there is a risk that the edge connecting the second region 121 and the main body position may be torn.

[0118] In some embodiments, the second filler layer 14 is an insulating layer.

[0119] The second filling layer 14 is an insulating layer. On the one hand, it fills the gap between two adjacent second regions 121. On the other hand, the insulating layer can shield metal ions, which can reduce the risk of lithium plating when the cell 100 is a lithium-ion cell.

[0120] Please refer to Figure 5 In some embodiments, the second electrode 12 includes a second coating area 123 on which a second active material is disposed and a second empty foil area 124 on which no second active material is disposed. The second region 121 is the second empty foil area 124, and the second filling layer 14 is disposed between two adjacent second empty foil areas 124.

[0121] In some embodiments, the second filling layer 14 is a conductive layer, and two adjacent second regions 121 are electrically connected through the second filling layer 14.

[0122] The second empty foil area 124 is connected to the second coating area 123. The second current collector 125 of the second empty foil area 124 and the second current collector 125 of the second coating area 123 can be integrally formed. The second empty foil area 124 extends from the second coating area 123.

[0123] The second filling layer 14 is a conductive layer. Two adjacent second regions 121 are electrically connected through the conductive layer. On the one hand, it fills the gap between the two adjacent second regions 121, and on the other hand, it increases the current carrying capacity of the two adjacent second regions 121.

[0124] In some embodiments, the second filler layer 14 is a conductive adhesive or a soldering agent.

[0125] The second filler layer 14 is a conductive adhesive or welding agent, which can improve the connection strength between two adjacent second regions 121 and improve the electrical connection stability between two adjacent second regions.

[0126] In some embodiments, the soldering agent may be solder paste, which is disposed between two adjacent second regions 121 to facilitate soldering of the plurality of second regions 121.

[0127] In some embodiments, the plurality of second electrodes 12 include end second electrodes located at the ends of the plurality of second electrodes 12 in a first direction X, and a conductive layer (such as a soldering agent) is disposed between the second adapter 30 and the end second electrodes, and the second adapter 30 and the end second electrodes are electrically connected through the conductive layer.

[0128] In one or more of the above optional embodiments, the second region 121 is provided with a third through hole, and the second adapter is disposed in the third through hole to rivet the second adapter 30 to a plurality of second pole pieces 12.

[0129] In some embodiments, the second adapter 30 may further include a second connection portion connected between the second adapter portion and the electrode terminal (or housing), the second connection portion enabling the connection between the second adapter portion and the electrode terminal (or housing).

[0130] Please refer to Figure 4 , Figure 5 and Figure 9 In some embodiments, the second region 121 is provided with a third through hole 121a, and the second adapter includes a second riveting part 31, which passes through the third through hole 121a to rivet the second adapter 30 to a plurality of second pole pieces 12.

[0131] The third through hole 121a penetrates the second region 121 along the thickness direction of the second electrode 12.

[0132] In some embodiments, the second adapter 30 further includes a second connecting portion 32, which can be a separate structure or an integral structure with the second riveting portion 31. When the second connecting portion 32 and the second riveting portion 31 are separate structures, they are connected and fixed together; when they are an integral structure, they can be integrally formed.

[0133] The end of the second riveting portion 31 has a second flange. When viewed along the first direction X, the projection of the second flange falls into the second region 121, thereby restricting the separation of the second riveting portion 31 from the second region 121 in the opposite direction to the riveting direction. The second connecting portion 32 and the second flange are respectively located at both ends of the plurality of second regions 121 in the first direction X, thereby restricting the separation of the second riveting portion 31 from the second region 121.

[0134] In some embodiments, the second connecting portion 32 may be disposed at one end of the plurality of second regions 121 in the first direction X, and the second connecting portion 32 is connected to the integral structure formed by the plurality of second regions 121. For example, please refer to Figure 9 and Figure 10 The second connecting part 32 may be provided with a fourth through hole 321, and the second riveting part 31 may pass through the fourth through hole 321 and be connected to the second connecting part 32. The second connecting part 32 may be welded to the second region 121 located at the end of the plurality of second regions 121.

[0135] In the above scheme, the second riveting part 31 passes through the third through hole 121a to rivet the second adapter 30 to the plurality of second pole pieces 12, so that the plurality of second pole pieces 12 are firmly connected to the second adapter 30, which is convenient for processing and manufacturing.

[0136] Please refer to Figure 9 and Figure 10In some embodiments, the second electrode 12 includes a second current collector 125, which includes a second body 1251 and a second protrusion 1252. The second protrusion 1252 protrudes from one side of the second body 1251 in the thickness direction and is arranged circumferentially along the third through hole 121a.

[0137] A third through hole 121a is provided in the second body 1251, extending through the second body 1251 along the first direction X. The second body 1251 has a second surface 1253, which is located on one side of the thickness direction of the second body 1251, and the thickness direction of the second body 1251 can be parallel to the first direction X. A second protrusion 1252 protrudes from the second surface 1253 and is arranged circumferentially along the third through hole 121a. The second protrusion 1252 can be fitted onto the outside of the second riveting part 31 and contacts the second riveting part 31.

[0138] The second protrusion 1252 can be integrally formed with the second body 1251. For example, the second current collector 125 is stamped to form the second body 1251 and the second protrusion 1252. Alternatively, the second protrusion 1252 can be a separate structure from the second body 1251, and the second protrusion 1252 can be welded to the second body 1251.

[0139] In the above scheme, the second protrusion 1252 is arranged circumferentially along the third through hole 121a. The second protrusion 1252 contacts the second riveting part 31, which can increase the connection area between the second current collector 125 and the second riveting part 31, thereby increasing the current flow capacity between the second electrode 12 and the second riveting part 31.

[0140] Please refer to Figure 4 In some embodiments, the second electrode 12 includes a second coating region 123 on which a second active material is disposed, and the second region 121 is a part of the second coating region 123.

[0141] During the manufacturing process of the second electrode 12, the second active material is coated on the surface of the second current collector 125 to form the second coating area 123, and the second region 121 is part of the second coating area 123, which simplifies the processing steps and eliminates the need to set up a separate empty foil area.

[0142] In the above scheme, the second region 121 is part of the second coating region 123, which facilitates processing and manufacturing.

[0143] In one or more of the above optional embodiments, the second filling layer 14 is a second active material layer.

[0144] For example, when the second region 121 is part of the second coating region 123, the second region 121 is provided with a third through hole 121a, and the second adapter 30 includes a second riveting part 31, which passes through the third through hole 121a to rivet the second adapter 30 to a plurality of second electrode sheets 12. A second filler layer 14 is provided between two adjacent second regions 121, and the second filler layer 14 is a second active material.

[0145] During the manufacturing process of the second electrode 12, a third through hole 121a can be opened only in the second region 121 without removing the active material in the second region 121 and setting other fillers, thus reducing the difficulty of the process.

[0146] The second region 121 is part of the second coating region 123, which facilitates processing and manufacturing. The second filling layer 14 is the second active material layer, which enables the battery cell 100 to have a high energy density.

[0147] Please refer to Figure 5 In some embodiments, the second electrode 12 includes a second coating area 123 on which a second active material is disposed and a second empty foil area 124 on which no second active material is disposed, wherein the second region 121 is the second empty foil area 124.

[0148] During the manufacturing process of the second electrode 12, a second active material is coated on the surface of the second current collector 125 to form a second coating area 123, and the uncoated portion of the second current collector 125 forms a second region 121.

[0149] In the above scheme, the second region 121 is the second empty foil region 124, which facilitates the electrical connection between multiple second regions 121.

[0150] Please refer to Figure 1 , Figure 6 and Figure 9 In one or more of the above optional embodiments, the electrode assembly 10 further includes a diaphragm 40 disposed between adjacent first electrode 11 and second electrode 12.

[0151] The diaphragm 40 is a component used to insulate and isolate the first electrode 11 and the second electrode 12, thereby reducing the risk of short circuits at the anode and cathode. The diaphragm 40 can be made of materials such as polyethylene (PE) or polypropylene (PP).

[0152] Please refer to Figure 1 In some embodiments, the diaphragm 40 has a third notch 41 that at least partially overlaps with the first notch 112.

[0153] The third notch 41 is provided in correspondence with the first notch 112 so that the second region 121 is exposed in the third notch 41 and the first notch 112, which facilitates the electrical connection of multiple second regions 121.

[0154] In some embodiments, the diaphragm 40 has a fourth notch 42 that at least partially overlaps with the second notch 122.

[0155] The fourth notch 42 is provided correspondingly to the second notch 122 so that the first region 111 is exposed in the fourth notch 42 and the second notch 122, which facilitates the electrical connection of multiple first regions 111.

[0156] Please refer to Figure 1 and Figure 11 In one or more of the above optional embodiments, the battery cell 100 further includes a packaging bag 50, and the electrode assembly 10 is disposed inside the packaging bag 50.

[0157] The electrode assembly 10 is disposed inside the packaging bag 50, and the battery cell 100 can be a soft-pack battery cell. In some embodiments, the packaging bag 50 can be made of aluminum-plastic film, polyimide film, polyethylene film, or polypropylene film, etc.

[0158] In the above scheme, the electrode assembly 10 is disposed inside the packaging bag 50, and the battery cell 100 can have a high energy density.

[0159] In some embodiments, one end of the first adapter 20 is electrically connected to the first region 111 of a plurality of first electrodes 11, and the other end of the first adapter 20 extends out of the packaging bag 50.

[0160] In the above scheme, the other end of the first adapter 20 extends out of the packaging bag 50 to facilitate electrical connection with other components.

[0161] In some embodiments, one end of the second adapter 30 is electrically connected to the second region 121 of a plurality of second pole pieces 12, and the other end extends out of the packaging bag 50.

[0162] In the above scheme, the other end of the second adapter 30 extends out of the packaging bag 50 to facilitate electrical connection with other components.

[0163] Please refer to Figure 1 and Figure 12 In one or more of the above optional embodiments, the battery cell 100 further includes a housing 60, a first electrode terminal 71 and a second electrode terminal 72, both of which are disposed on the housing 60.

[0164] One end of the first adapter 20 is electrically connected to the first region 111 of the plurality of first electrodes 11, and the other end of the first adapter 20 is electrically connected to the first electrode terminal 71.

[0165] One end of the second adapter 30 is electrically connected to the second region 121 of the plurality of second pole pieces 12, and the other end of the second adapter 30 is electrically connected to the second electrode terminal 72.

[0166] The housing 60 can have a certain strength to protect the electrode assembly 10. Both the first electrode terminal 71 and the second electrode terminal 72 are disposed in the housing 60. For example, two through holes are provided on the housing 60; the first electrode terminal 71 is disposed in one through hole for connection to the first adapter 20; the second electrode terminal 72 is disposed in the other through hole for connection to the second adapter 30. Furthermore, both the first electrode terminal 71 and the second electrode terminal 72 are insulated from the housing 60 to reduce the risk of short circuits between the anode and cathode.

[0167] In the above scheme, the first adapter 20 is electrically connected to the first electrode terminal 71, and the second adapter 30 is electrically connected to the second electrode terminal 72, so as to facilitate the discharge of electrical energy from the electrode assembly 10.

[0168] Please refer to Figure 1 and Figure 13 In one or more of the above optional embodiments, the battery cell 100 further includes a housing 60 and a first electrode terminal 71, the first electrode terminal 71 being insulated from the housing 60, one end of the first adapter 20 being electrically connected to the first region 111 of a plurality of first electrode plates 11, and the other end of the first adapter 20 being electrically connected to the first electrode terminal 71.

[0169] One end of the second adapter 30 is electrically connected to the second region 121 of the plurality of second pole pieces 12, and the other end of the second adapter 30 is electrically connected to the housing 60.

[0170] The second adapter 30 is electrically connected to the housing 60, which can save parts and reduce costs.

[0171] In the above scheme, the first adapter 20 is electrically connected to the first electrode terminal 71, and the second adapter 30 is electrically connected to the housing 60, so as to facilitate the discharge of electrical energy from the electrode assembly 10.

[0172] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 100 as provided in any of the above embodiments. The battery cell 100 is used to provide electrical energy.

[0173] Electrical devices may include, but are not limited to, mobile terminals, smart wearables, power tools, electric vehicles, and power banks.

[0174] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electric cell, characterized by, include: The electrode assembly has a stacked structure, comprising a plurality of first electrode plates and a plurality of second electrode plates stacked along a first direction. The first electrode plates and the second electrode plates have opposite polarities. Each first electrode plate has a first notch, and each second electrode plate has a second notch. When viewed along the first direction, the first notch and the second notch do not overlap. Each first electrode plate has a first area exposed to the second notch, and each second electrode plate has a second area exposed to the first notch. The first adapter is electrically connected to the first region of the plurality of first electrodes; The second adapter is electrically connected to the second region of the plurality of second pole pieces; The first adapter includes a first adapter portion that passes through a plurality of first regions to connect the first adapter to the plurality of first electrodes; The second adapter includes a second adapter portion that passes through a plurality of second regions to connect the second adapter to the plurality of second electrodes.

2. The electric cell of claim 1, wherein, The first notch is located at the first corner of the first electrode, and the first region is located at the second corner of the first electrode. The second notch is located at the first triangular position of the second electrode, and the second region is located at the fourth corner position of the second electrode.

3. The battery cell according to claim 2, characterized in that, The first corner position and the second corner position are two adjacent corner positions of the first electrode plate; The third and fourth corner positions are two adjacent corner positions of the second electrode.

4. The battery cell according to any one of claims 1-3, characterized in that, A first filling layer is provided between two adjacent first regions.

5. The battery cell according to claim 4, characterized in that, The first filling layer is the first active material layer.

6. The battery cell according to claim 4, characterized in that, The first filling layer is an insulating layer.

7. The battery cell according to claim 4, characterized in that, The first electrode includes a first coated area with a first active material and a first empty foil area without the first active material. The first area is the first empty foil area, and the first filling layer is a conductive layer. Two adjacent first areas are electrically connected through the first filling layer.

8. The battery cell according to claim 7, characterized in that, The first filler layer is a conductive adhesive or a soldering agent.

9. The battery cell according to claim 1, characterized in that, The first region is provided with a first through hole, and the first adapter includes a first riveting part, which passes through the first through hole to rivet the first adapter to the plurality of first pole pieces.

10. The battery cell according to claim 9, characterized in that, The first adapter further includes a first connecting portion, which is disposed at one end of the plurality of first regions in the first direction, and the first connecting portion and the first riveting portion are integral structures.

11. The battery cell according to claim 10, characterized in that, One end of the first riveting part has a first flange. When viewed along the first direction, the projection of the first flange falls into the first region. The first connecting part and the first flange are respectively located at both ends of the plurality of first regions in the first direction.

12. The battery cell according to claim 9, characterized in that, The first electrode includes a first current collector, which includes a first body and a first protrusion. The first protrusion protrudes from one side of the first body in the thickness direction and is arranged circumferentially along the first through hole.

13. The battery cell according to claim 1, characterized in that, The first electrode includes a first coating area on which a first active material is disposed, wherein the first region is a portion of the first coating area; or, The first electrode includes a first coated area with a first active material and a first empty foil area without the first active material, wherein the first area is the first empty foil area.

14. The battery cell according to claim 1, characterized in that, The electrode assembly further includes a diaphragm disposed between adjacent first and second electrodes, the diaphragm having a third notch that at least partially overlaps with the first notch and a fourth notch that at least partially overlaps with the second notch.

15. The battery cell according to claim 1, characterized in that, The battery cell also includes a packaging bag, the electrode assembly is disposed inside the packaging bag, one end of the first adapter is electrically connected to the first region of the plurality of first electrodes, and the other end of the first adapter extends out of the packaging bag; One end of the second adapter is electrically connected to the second region of the plurality of second electrodes, and the other end extends out of the packaging bag.

16. The battery cell according to claim 1, characterized in that, The battery cell also includes a housing, a first electrode terminal, and a second electrode terminal. The first electrode terminal and the second electrode terminal are both disposed in the housing. One end of the first adapter is electrically connected to the first region of the plurality of first electrode plates, and the other end of the first adapter is electrically connected to the first electrode terminal. One end of the second adapter is electrically connected to the second region of the plurality of second electrode plates, and the other end of the second adapter is electrically connected to the second electrode terminal.

17. The battery cell according to claim 1, characterized in that, The battery cell also includes a housing and a first electrode terminal, the first electrode terminal being insulated from the housing, one end of the first adapter being electrically connected to the first region of the plurality of first electrodes, the other end of the first adapter being electrically connected to the first electrode terminal, one end of the second adapter being electrically connected to the second region of the plurality of second electrodes, and the other end of the second adapter being electrically connected to the housing.

18. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1-17.

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