Electrochemical device and electronic apparatus

Abstract

The invention provides an electrochemical device and electronic equipment, and relates to the technical field of electrochemical energy storage, and the electrochemical device comprises a first pole piece and a second pole piece. The first pole piece comprises a first current collector, the first current collector comprises a first main body and a second main body, and the first main body and the second main body are stacked along a first direction; the second pole piece comprises a second current collector, the second current collector comprises a third main body, and the third main body is located between the first main body and the second main body; the first pole piece further comprises a first tab, the second pole piece further comprises a second tab, the first tab is located on one side of the first main body in the second direction, one end is connected to the first main body, and the other end is connected to the second main body; the second tab is located on one side of the second main body in the second direction and connected to the third main body, the first tab and the second tab are spaced in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. According to the electrochemical device and the electronic equipment in the embodiment of the invention, the occupied space is smaller.

Description

Technical Field

[0001] This application relates to the field of electrochemical energy storage technology, electrochemical devices and electronic equipment. Background Technology

[0002] A laminated battery cell is a type of battery cell formed by stacking multiple positive and negative electrodes and multiple separators, and it has a high energy density. Some technologies form laminated cells by alternating the folding of positive and negative electrodes, but in the above schemes, the tabs are located on different sides of the laminated cell, resulting in a larger overall width and length of the cell, and a larger overall space occupation for the laminated cell. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an electrochemical device with a smaller footprint.

[0004] This application also proposes an electronic device having the above-mentioned electrochemical device.

[0005] An electrochemical device according to a first aspect embodiment of this application includes: The first electrode includes a first current collector, the first current collector includes a first body and a second body, the first body and the second body are stacked along a first direction; The second electrode includes a second current collector, the second current collector includes a third body, the third body being located between the first body and the second body; The first electrode further includes a first electrode tab, and the second electrode further includes a second electrode tab. The first electrode tab is located on one side of the first body in the second direction, with one end connected to the first body and the other end connected to the second body. The second electrode tab is located on one side of the second body in the second direction and is connected to the third body. The first electrode tab and the second electrode tab are spaced apart in the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0006] The electrochemical device according to the embodiments of this application has at least the following beneficial effects: Since the two ends of the first electrode are respectively connected to the first body and the second body, and the third body is located between the first body and the second body in the first direction, during the processing of the electrochemical device of this application, the second body can be flipped relative to the first body by bending the first electrode, and then stacked on the first body, while simultaneously placing the third body between the first body and the second body, resulting in higher production efficiency. On the other hand, since the second electrode and the bent first electrode are arranged along the third direction and are both located on one side of the first body in the second direction, the first electrode can utilize the space occupied by the second electrode in the second direction, making the overall space occupied by the electrochemical device smaller.

[0007] According to some embodiments of this application, the first current collector includes a plurality of first bodies and a plurality of second bodies, the plurality of first bodies and the plurality of second bodies being stacked alternately, and adjacent first bodies and second bodies defining a stacking gap; the second electrode includes a plurality of third bodies and a plurality of second electrode tabs, each third body being located in a different stacking gap and connected to a different second electrode tab; The first electrode further includes a plurality of first tabs, and the first current collector further includes a plurality of first bends; each first bend is located on the side of the first body opposite to the second direction; along the first direction, a plurality of first bodies and a plurality of second bodies are alternately connected through the first bends and the first tabs.

[0008] According to some embodiments of this application, the second current collector further includes a plurality of fourth bodies, a plurality of second bends, and a plurality of third bends; along the first direction, the third bodies and the fourth bodies are alternately stacked and located at different stacking gaps, and each fourth body is connected to a different second tab; each second bend is located on one side of the third body in the third direction, and each third bend is located on the other side of the fourth body in the third direction, and along the first direction, the plurality of third bodies and the plurality of fourth bodies are alternately connected through the second bends and the third bends.

[0009] According to some embodiments of this application, the first electrode includes a plurality of first active material layers, the first active material layers being disposed on one side of the first body in the first direction and on the side opposite to the first direction, and on one side of the second body in the first direction and on the side opposite to the first direction; the second electrode includes a plurality of second active material layers, the second active material layers being disposed on one side of the third body in the first direction and on the side opposite to the first direction, and on one side of the fourth body in the first direction and on the side opposite to the first direction.

[0010] According to some embodiments of this application, the first electrode further includes a plurality of first insulating layers, each of which is disposed on the surface of a different first bend; And / or, the second electrode further includes a plurality of second insulating layers and a plurality of third insulating layers, each of the second insulating layers being disposed on the surface of a different second bend, and each of the third insulating layers being disposed on the surface of a different third bend.

[0011] According to some embodiments of this application, the electrochemical device further includes a first membrane and a second membrane, the second current collector having a thickness direction, the first membrane being stacked on one side of the second current collector in the thickness direction, and the second membrane being stacked on the other side of the second current collector in the thickness direction.

[0012] According to some embodiments of this application, the first electrode includes a plurality of first active material layers, the first active material layers being disposed on one side of the first body in the first direction and on the side opposite to the first direction, and on one side of the second body in the first direction and on the side opposite to the first direction; the second electrode includes a plurality of second active material layers, the second active material layers being disposed on one side of the third body in the first direction and on the side opposite to the first direction.

[0013] According to some embodiments of this application, along the second direction, the first electrode extends beyond the second electrode.

[0014] According to some embodiments of this application, one end of the first electrode is integrally connected to the first body, and the other end is integrally connected to the second body.

[0015] An electronic device according to a second aspect of this application includes an electrochemical device as described in any of the above embodiments.

[0016] The electronic device according to the embodiments of this application has at least the following beneficial effects: Since the two ends of the first electrode are respectively connected to the first body and the second body, and the third body is located between the first body and the second body in the first direction, during the manufacturing process of the electronic device of this application, the second body can be flipped relative to the first body by bending the first electrode, and then stacked on the first body, while simultaneously placing the third body between the first body and the second body, resulting in higher production efficiency. On the other hand, since the second electrode and the bent first electrode are arranged along the third direction and are both located on one side of the first body in the second direction, the first electrode can utilize the space occupied by the second electrode in the second direction, making the overall space occupied by the electronic device smaller.

[0017] 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

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of an electrochemical device according to some embodiments of this application; Figure 2 for Figure 1 The cross-sectional view shown at point AA; Figure 3 for Figure 2 A magnified view shown at point C; Figure 4 for Figure 1 The cross-sectional view shown at point BB; Figure 5 for Figure 1 A schematic diagram of the unfolding of the first electrode plate; Figure 6 for Figure 1 A schematic diagram of the unfolding of the second pole piece; Figure 7 for Figure 1 A schematic diagram of the stacking of the first and second electrodes; Figure 8 for Figure 7 A schematic diagram showing the first electrode plate bending relative to the second electrode plate; Figure 9 for Figure 8 A schematic diagram showing the second electrode plate bending relative to the first electrode plate; Figure 10 This is a schematic diagram of an electrochemical device for some embodiments of this application.

[0019] Figure label: Electrochemical device 10; First electrode 100, first current collector 110, first main body 111, second main body 112, first bent portion 113, lamination gap 114, first active material layer 120, first tab 130, first insulating layer 140; Second electrode 200, second current collector 210, third main body 211, fourth main body 212, second bending portion 213, third bending portion 214, second active material layer 220, second electrode tab 230; First diaphragm 300; Second diaphragm 400. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The embodiments of this application may omit unnecessary detailed descriptions. For example, detailed descriptions of well-known matters and repeated descriptions of actually identical structures may be omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art.

[0021] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0022] As used herein, the terms “approximately,” “generally,” “substantially,” and “about” are used to describe and indicate small variations. When used in conjunction with an event or situation, the terms may refer to examples in which the event or situation occurred precisely and examples in which the event or situation occurred very approximately. For example, when used in conjunction with numerical values, the terms may refer to a range of variation less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%. For example, if the difference between two values ​​is less than or equal to ±10% of the average of the values ​​(e.g., less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%), then the two values ​​can be considered "substantially" the same.

[0023] Furthermore, for ease of description, "first," "second," "third," etc., can be used in this article to distinguish different components of a figure or a series of figures. "First," "second," "third," etc., are not intended to describe the corresponding components.

[0024] Additionally, quantities, ratios, and other numerical values ​​are sometimes presented in range format in this document. It should be understood that such range format is for convenience and brevity and should be interpreted flexibly to include not only the numerical values ​​explicitly specified as range limits, but also all individual numerical values ​​or subranges covered within the range, as if each numerical value and subrange were explicitly specified.

[0025] In the detailed description and claims, a list of items connected by the terms "one of," "among," "a kind of," or other similar terms may mean any of the listed items. For example, if items A and B are listed, then the phrase "one of A and B" means only A or only B. In another example, if items A, B, and C are listed, then the phrase "one of A, B, and C" means only A; only B; or only C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements. In the detailed description and claims, a list of items connected by the term "at least one of" may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another instance, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C.

[0026] In the following description, all figures disclosed in this application are approximate values, regardless of whether the terms "about" or "approximately" are used in conjunction. They may vary by 1%, 2%, 5%, or sometimes 10% to 20%. Whenever a range of values ​​with a lower limit (RL) and an upper limit (RU) is disclosed, any values ​​falling within that range are specifically disclosed. Specifically, the following values ​​within this range are specifically disclosed: R = RL + k * (RU - RL), where k is a variable ranging from 1% to 100% with a 1% increment, i.e., k is 1%, 2%, 3%, 4%, 5%, ..., 50%, 51%, 52%, ..., 95%, 96%, 97%, 98%, 99%, or 100%. Furthermore, any range of values ​​defined by the two R values ​​as defined above are also specifically disclosed.

[0027] Throughout this specification, references to "implementation," "partial implementation," "one implementation," "another implementation," "specific method," or "partial method" mean that at least one implementation or embodiment in this application includes the specific features, structures, materials, or characteristics described in that implementation or embodiment.

[0028] In this application, numerical ranges are involved. Unless otherwise specified, the numerical ranges mentioned above are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Any lower limit can be combined with any upper limit to form a range not explicitly stated; and any lower limit can be combined with other lower limits to form a range not explicitly stated, just as any upper limit can be combined with any other upper limit to form a range not explicitly stated. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form a range not explicitly stated.

[0029] Please refer to Figures 1 to 9 As shown, this application proposes an electrochemical device 10. The electrochemical device 10 of this application includes a first electrode 100 and a second electrode 200.

[0030] Please refer to Figure 1 , Figure 2 , Figure 3 As shown, the first electrode 100 of this application includes a first current collector 110, the first current collector 110 includes a first body 111 and a second body 112, the first body 111 and the second body 112 are stacked along a first direction. The second electrode 200 includes a second current collector 210, the second current collector 210 includes a third body 211, the third body 211 is located between the first body 111 and the second body 112.

[0031] Some technologies involve alternating folding of positive and negative electrode sheets in the vertical direction, causing different parts of the positive and negative electrode sheets to be stacked in the thickness direction of the cell, forming a laminated cell. The inventors discovered that although the above-mentioned process of folding positive and negative electrode sheets can reduce the trouble of stacking multiple separate electrode sheets sequentially in the conventional laminated cell production process and improve the production efficiency of laminated cells, the positive and negative electrode tabs of the cells produced by the above process also extend in the vertical direction, resulting in a larger space occupation of the laminated cell, which is not conducive to the miniaturization of electronic devices.

[0032] In view of this, please refer to Figure 1 , Figure 2 As shown, the first electrode 100 of this application further includes a first electrode tab 130, and the second electrode 200 further includes a second electrode tab 230. The first electrode tab 130 is located on one side of the first body 111 in the second direction, with one end connected to the first body 111 and the other end connected to the second body 112. The second electrode tab 230 is located on one side of the second body 112 in the second direction and is connected to the third body 211. The first electrode tab 130 and the second electrode tab 230 are spaced apart in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0033] Since the two ends of the first electrode 130 of this application are respectively connected to the first body 111 and the second body 112, and the second electrode 230 is connected to the third body 211, when the first electrode 130 and the second electrode 230 of this application are respectively connected to the positive and negative terminals of the external electronic device, they can draw out the electrical energy located in the first body 111, the second body 112 and the third body 211, and then supply power to the external electronic device.

[0034] Furthermore, since the two ends of the first tab 130 are respectively connected to the first body 111 and the second body 112, and the third body 211 is located between the first body 111 and the second body 112 in the first direction, during the processing of the electrochemical device 10 of this application, the second body 112 can be flipped relative to the first body 111 by bending the first tab 130, and then stacked on the first body 111, while simultaneously placing the third body 211 between the first body 111 and the second body 112, resulting in higher production efficiency. On the other hand, the second tab 230 and the bent first tab 130 are arranged along the third direction and are both located on one side of the first body 111 in the second direction. Therefore, the first tab 130 can utilize the space occupied by the second tab 230 in the second direction, making the overall space occupied by the electrochemical device 10 smaller.

[0035] For example, please refer to Figure 1 As shown, in some embodiments, the first direction is parallel to the thickness direction of the electrochemical device 10, the second direction is parallel to the width direction of the electrochemical device 10, and the third direction is parallel to the length direction of the electrochemical device 10. In the above embodiments, the first tab 130 of the electrochemical device 10 utilizes the space occupied by the second tab 230 in the length direction, reducing the space occupied by the electrochemical device 10 in the width direction, and the overall space occupied by the electrochemical device 10 is smaller.

[0036] Without departing from the inventive concept of this application, those skilled in the art can make adjustments to the structure of the first electrode 130 and the second electrode 230. As a preferred embodiment, please refer to... Figure 1 As shown, in some embodiments, the first tab 130 extends beyond the second tab 230 along the second direction. Since the first tab 130 extends beyond the second tab 230 in the second direction, when the first body 111 is folded relative to the second body 112 and stacked on top of the second body 112 by bending the first tab 130, it is more difficult for the folded second body 112 to come into contact with the second tab 230. This helps to reduce the possibility of the second tab 230 folding due to the collision with the second body 112, thereby improving the manufacturing yield.

[0037] Please refer to Figure 2 , Figure 5As shown, in some embodiments, one end of the first tab 130 is integrally connected to the first body 111, and the other end is integrally connected to the second body 112. Through this design, the first tab 130 can be more securely connected to the first body 111 and the second body 112, and the second body 112 can be more easily stacked onto the first body 111 during processing by bending the first tab 130.

[0038] Those skilled in the art can choose the specific form in which the first tab 130 is integrally connected to the first body 111 and the second body 112 based on existing technology, such as welding or gluing. As a preferred embodiment, the first body 111, the second body 112, and the first tab 130 are all formed from the same metal foil or the same composite foil after cutting. This arrangement results in a higher connection strength between the first body 111, the second body 112, and the first tab 130, and is also easier to process.

[0039] Please refer to Figure 3 As shown, in some embodiments, the first electrode 100 includes multiple first active material layers 120, the first active material layers 120 being disposed on one side of the first body 111 in the first direction and on the side opposite to the first direction, and the second body 112 being disposed on one side of the first direction and on the side opposite to the first direction; the second electrode 200 includes multiple second active material layers 220, the second active material layers 220 being disposed on one side of the first direction and on the side opposite to the first direction of the third body 211. Through the above scheme, the first active material layers 120 and the second active material layers 220 can store electrical energy. The electrical energy stored in the first active material layer 120 can be conducted to the first tab 130 through the first body 111 and the second body 112, and the electrical energy stored in the second active material layer 220 can be conducted to the second tab 230 through the third body 211.

[0040] Those skilled in the art can further adjust the structure of the first electrode 100 and the second electrode 200.

[0041] Further, please refer to Figure 2 , Figure 3 , Figure 5As shown, in some embodiments, the first current collector 110 includes a plurality of first bodies 111 and a plurality of second bodies 112, which are alternately stacked, with adjacent first bodies 111 and second bodies 112 defining a stacking gap 114; the second electrode 200 includes a plurality of third bodies 211 and a plurality of second tabs 230, each third body 211 being located in a different stacking gap 114 and connected to a different second tab 230. The first electrode 100 further includes a plurality of first tabs 130, and the first current collector 110 further includes a plurality of first bends 113; each first bend 113 is located on the side of the first body 111 opposite to the second direction; along the first direction, the plurality of first bodies 111 and the plurality of second bodies 112 are alternately connected via the first bends 113 and the first tabs 130.

[0042] Through the above scheme, multiple first bodies 111 and multiple second bodies 112 can form a structure in which multiple first bodies 111 and multiple second bodies 112 are alternately stacked by bending the first bending portion 113 and the first electrode tab 130. The processing efficiency of the electrochemical device 10 is higher, and each third body 211 can be accommodated in different stacking gaps 114. Each third body 211 is located between different first bodies 111 and second bodies 112, and each third body 211 can conduct electrical energy through the second electrode tab 230 connected to itself.

[0043] Specifically, please refer to Figure 2 , Figure 3 As shown, along the first direction, multiple first bodies 111 and multiple second bodies 112 are alternately connected via a first bend 113 and a first tab 130. A first body 111 is connected to an adjacent second body 112 located in the first direction via the first tab 130, and a second body 112 is connected to an adjacent first body 111 located in the first direction via the first bend 113. Since the first bend 113 is located on the side of the first body 111 opposite to the second direction, please refer to... Figure 5 As shown, during the fabrication of the electrochemical device 10 in the above embodiments, multiple first bodies 111 and multiple second bodies 112 are connected by first tabs 130 and first bends 113 to form a continuous structure. By sequentially folding the first tabs 130 and the first bends 113 along the arrangement direction of the first bodies 111 and the second bodies 112, the multiple first bodies 111 and multiple second bodies 112 can be staggered and stacked in the first direction to form a stacking gap 114 for accommodating the third body 211, thus improving the fabrication efficiency of the electrochemical device 10. The multiple first tabs 130 located on one side of the first body 111 in the second direction can all be used to extract the electrical energy accumulated in the first body 111 and the second body 112, resulting in lower internal resistance of the electrochemical device 10.

[0044] Further, please refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 As shown, in some embodiments, the second current collector 210 further includes a plurality of fourth bodies 212, a plurality of second bends 213, and a plurality of third bends 214; along the first direction, the third bodies 211 and the fourth bodies 212 are alternately stacked and located at different stacking gaps 114, and each fourth body 212 is connected to a different second tab 230; each second bend 213 is located on one side of the third body 211 in the third direction, and each third bend 214 is located on the other side of the fourth body 212 in the third direction, and along the first direction, the plurality of third bodies 211 and the plurality of fourth bodies 212 are alternately connected through the second bends 213 and the third bends 214.

[0045] Through the above scheme, multiple third bodies 211 and multiple fourth bodies 212 can form a structure in which multiple third bodies 211 and multiple fourth bodies 212 are alternately stacked by bending through the second bending portion 213 and the third bending portion 214, so that each third body 211 and each fourth body 212 can be accommodated in different stacking gaps 114, each third body 211 and each fourth body 212 is located between different first bodies 111 and second bodies 112, and each third body 211 and each fourth body 212 can conduct electrical energy through multiple second tabs 230, resulting in lower internal resistance of the electrochemical device 10.

[0046] On the other hand, since multiple third bodies 211 and multiple fourth bodies 212 are alternately connected along the first direction via second bends 213 and third bends 214, the third bodies 211 are connected to adjacent fourth bodies 212 in the first direction via second bends 213, and the fourth bodies 212 are connected to adjacent third bodies 211 in the first direction via third bends 214. Furthermore, since each second bend 213 is located on one side of the third body 211 in the third direction, and each third bend 214 is located on the other side of the fourth body 212 in the third direction, please refer to... Figure 6 As shown, during the processing of the electrochemical device 10 in the above embodiment, a plurality of third bodies 211 and a plurality of fourth bodies 212 are connected by a second bending portion 213 and a third bending portion 214 to form a continuous structure. By sequentially folding the second bending portion 213 and the third bending portion 214 along the arrangement direction of the third bodies 211 and the fourth bodies 212, the plurality of third bodies 211 and the plurality of fourth bodies 212 can be staggered and stacked in the first direction, and each third body 211 and each fourth body 212 is located in a different stacking gap 114.

[0047] To facilitate understanding of the processing of the electrochemical device 10 of this application by those skilled in the art, the following is combined with... Figures 5 to 9 The processing procedure of an electrochemical device 10 according to one embodiment will be described.

[0048] Please refer to Figure 5 , Figure 6 , Figure 7 As shown, where Figure 7 The first electrode 100 is Figure 5 The first electrode is 100. Figure 7 The second electrode 200 is Figure 6 The second electrode 200. The first electrode 100 includes a plurality of first bodies 111 and a plurality of second bodies 112, which are arranged alternately and connected alternately by a plurality of first tabs 130 and a plurality of first bends 113. The second electrode 200 includes a plurality of third bodies 211 and a plurality of fourth bodies 212, which are arranged alternately and connected alternately by a plurality of second bends 213 and a plurality of third bends 214.

[0049] Please refer to Figure 7 As shown, at the start of processing, the first body 111 located at one end of the first electrode 100 and the third body 211 located at one end of the second electrode 200 are stacked.

[0050] Please refer to Figure 7 , Figure 8 As shown, during the processing, the first electrode 130 is arranged according to... Figure 7 The folding direction shown in the figure is bent so that the second body 112 is folded relative to the first body 111, such that the second body 112 is stacked on the third body 211, and the third body 211 is located between the first body 111 and the second body 112.

[0051] Please refer to Figure 8 , Figure 9 As shown, continue pressing the second bend 213... Figure 7 The folding direction shown in the figure is bent so that the fourth body 212 is folded relative to the third body 211, such that the fourth body 212 is stacked on the second body 112, and the second body 112 is located between the third body 211 and the fourth body 212.

[0052] refer to Figure 8 , Figure 9 The folding direction continues to bend the first bend 113, the third bend 214, the first tab 130, and the second bend 213 in sequence. After repeating this process multiple times, multiple first bodies 111, multiple second bodies 112, multiple third bodies 211, and multiple fourth bodies 212 can be stacked.

[0053] Further, please refer to Figure 3 As shown, in some embodiments, the first electrode 100 includes multiple first active material layers 120, the first active material layers 120 being disposed on one side of the first body 111 in the first direction and on the side opposite to the first direction, and the second body 112 being disposed on one side of the first direction and on the side opposite to the first direction; the second electrode 200 includes multiple second active material layers 220, the second active material layers 220 being disposed on one side of the third body 211 in the first direction and on the side opposite to the first direction, and the fourth body 212 being disposed on one side of the first direction and on the side opposite to the first direction. Through the above scheme, the first active material layers 120 and the second active material layers 220 can store electrical energy. The electrical energy stored in the first active material layer 120 can be conducted to the first electrode tab 130 through the first body 111 and the second body 112, and the electrical energy stored in the second active material layer 220 can be conducted to the second electrode tab 230 through the third body 211 and the fourth body 212.

[0054] Based on the above plan, please refer to Figure 3 As shown, in some embodiments, the first electrode 100 further includes a plurality of first insulating layers 140, each first insulating layer 140 being disposed on the surface of a different first bend 113. Through this scheme, the first insulating layer 140 can prevent contact between the first bend 113 and the second electrode 200, thereby reducing the possibility of a short circuit in the electrochemical device 10 and improving the stability of the electrochemical device 10.

[0055] In some embodiments, the second electrode 200 further includes a plurality of second insulating layers and a plurality of third insulating layers. Each second insulating layer is disposed on the surface of a different second bend 213, and each third insulating layer is disposed on the surface of a different third bend 214. Through this design, the second insulating layers can prevent contact between the second bend 213 and the first electrode 100, and the third insulating layers can prevent contact between the third bend 214 and the first electrode 100, thereby reducing the possibility of a short circuit in the electrochemical device 10 and improving the stability of the electrochemical device 10.

[0056] It should be noted that, during the operation of the electrochemical device 10 of this application, the first electrode 100 and the second electrode 200 need to be isolated by a diaphragm to provide a path for ion migration and to prevent short circuits between the first electrode 100 and the second electrode 200. Those skilled in the art can use existing diaphragm configurations for the electrochemical device 10 to separate the first electrode 100 and the second electrode 200.

[0057] As a preferred option, please refer to Figure 4As shown, in some embodiments, the electrochemical device 10 further includes a first diaphragm 300 and a second diaphragm 400. The second current collector 210 has a thickness direction. The first diaphragm 300 is stacked on one side of the second current collector 210 in the thickness direction, and the second diaphragm 400 is stacked on the other side of the second current collector 210 in the thickness direction. Through this design, the first diaphragm 300 and the second diaphragm 400 can prevent contact between the second electrode 200 and the first electrode 100. Furthermore, during the fabrication of the electrochemical device 10, the first diaphragm 300 and the second diaphragm 400 can be bent along with the bending of the second electrode 200, which simplifies the fabrication process.

[0058] Without departing from the inventive concept of this application, those skilled in the art can adjust the shapes of the first body 111, the second body 112, the third body 211, and the fourth body 212. Please refer to... Figure 1 As shown, in some embodiments, the first body 111, the second body 112, the third body 211, and the fourth body 212 are rectangular. Please refer to... Figure 10 As shown, in some embodiments, the first body 111, the second body 112, the third body 211, and the fourth body 212 are "L"-shaped. It should be noted that the first body 111, the second body 112, the third body 211, and the fourth body 212 can also be other shapes.

[0059] Without departing from the inventive concept of this application, those skilled in the art can adjust the polarity of the first electrode 100 and the second electrode 200. In some embodiments, the first current collector 110 is a negative current collector, the first active material layer 120 may include a negative active material, a negative binder and a negative conductive agent, the second current collector 210 is a positive current collector, and the second active material layer 220 may include a positive active material, a positive binder and a positive conductive agent.

[0060] In some embodiments, the negative electrode active material may include at least one of natural graphite particles, synthetic graphite particles, hard carbon, soft carbon, mesophase carbon microspheres (MCMB), Sn, SnO2, SnO, Li4Ti5O12 (LTO), Si materials, silicon-carbon (Si-C) composite materials, silicon-nitrogen (Si-N) composite materials, and silicon-oxygen (Si-O) composite materials. The negative electrode active material of this application is not limited to the above-mentioned materials, but also includes other materials that can be used as negative electrode active materials in batteries.

[0061] In some embodiments, the negative electrode binder may include at least one of polyacrylic acid, polymethacrylic acid, polyacrylate, polymethacrylate, polyacrylamide, styrene-butadiene rubber, acrylic styrene-butadiene rubber, acrylic acid-acrylonitrile-acrylamide copolymer, acrylic acid-acrylonitrile-acrylate copolymer, acrylonitrile-butadiene rubber, nitrile rubber, acrylonitrile-styrene-butadiene copolymer, acryloyl rubber, butyl rubber, fluororubber, polytetrafluoroethylene, polyvinyl alcohol, polyvinyl acetate, polyepoxychloropropane, polyphosphazene, polyacrylonitrile, polystyrene, latex, acrylic resin, phenolic resin, epoxy resin, carboxymethyl cellulose, hydroxypropyl cellulose, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethyl cellulose, carboxymethyl chitosan, polyester, polyamide, polyether, polyimide, polycarboxylic acid ester, polycarboxylic acid, polyurethane, alginate, fluorinated polymer, chlorinated polymer, polyvinylidene fluoride, and poly(vinylidene fluoride)-hexafluoropropylene. The negative electrode binder of this application is not limited to the above-mentioned materials, but also includes other materials that can be used as battery negative electrode binders.

[0062] In some embodiments, the negative electrode conductive agent may include at least one of carbon, carbon black, graphite, expanded graphite, graphene, graphene nanosheets, superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon fibers, carbon nanofibers, graphitized carbon sheets, carbon nanotubes, carbon nanotubes, activated carbon, and mesoporous carbon. The negative electrode conductive agent of this application is not limited to the above-mentioned materials, but also includes other materials that can be used as battery negative electrode conductive agents.

[0063] In some embodiments, the positive electrode active material is selected from the group consisting of LiCoO2, LiNiO2, LiNixMnyO2, Li1+zNixMnyCo1-x-yO2, LiNixCoyAlzO2, LiV2O5, LiTiS2, LiMoS2, LiMnO2, LiCrO2, LiMn2O4, Li2MnO3, LiFeO2, LiFePO4, LiMnPO4, and combinations thereof, wherein each x is independently from 0.2 to 0.9; each y is independently from 0.1 to 0.45; and each z is independently from 0 to 0.2. The positive electrode active material of this application is not limited to the above-mentioned materials, but also includes other materials that can be used as positive electrode active materials. In some embodiments, the positive electrode active material is selected from the group consisting of LiCoO2, LiNiO2, LiNixMnyO2, Li1+zNixMnyCo1-x-yO2, LiNixCoyAlzO2, LiV2O5, LiTiS2, LiMoS2, LiMnO2, LiCrO2, LiMn2O4, LiFeO2, LiFePO4, and combinations thereof, wherein each x is independently 0.4 to 0.6; each y is independently 0.2 to 0.4; and each z is independently 0 to 0.1. In some embodiments, the positive electrode active material is Li1+xNiaMnbCocAl(1-abc)O2; wherein -0.2≤x≤0.2, 0≤a<1, 0≤b<1, 0≤c<1, and a+b+c≤1.

[0064] In some embodiments, the positive electrode active material has the general formula Li1+xNiaMnbCocAl(1-abc)O2, wherein 0.33≤a≤0.92, 0.33≤a≤0.9, 0.33≤a≤0.8, 0.5≤a≤0.92, 0.5≤a≤0.9, 0.5≤a≤0.8, 0.6≤a≤0.92, or 0.6≤a≤0.9. The following conditions apply: 0≤b≤0.5, 0≤b≤0.3, 0.1≤b≤0.5, 0.1≤b≤0.4, 0.1≤b≤0.3, 0.1≤b≤0.2, or 0.2≤b≤0.5; 0≤c≤0.5, 0≤c≤0.3, 0.1≤c≤0.5, 0.1≤c≤0.4, 0.1≤c≤0.3, 0.1≤c≤0.2, or 0.2≤c≤0.5. In some embodiments, the positive electrode active material is doped with a dopant selected from the group consisting of Fe, Ni, Mn, Al, Mg, Zn, Ti, La, Ce, Sn, Zr, Ru, Si, Ge, and combinations thereof. In some embodiments, the dopant is not Fe, Ni, Mn, Mg, Zn, Ti, La, Ce, Ru, Si, or Ge. In some embodiments, the dopant is not Al, Sn, or Zr. In some embodiments, the positive electrode active material may include at least one of LiNi0.33Mn0.33Co0.33O2, LiNiO2, LiNi0.4Mn0.4Co0.2O2, LiNi0.5Mn0.3Co0.2O2, LiNi0.6Mn0.2Co0.2O2, LiNi0.7Mn0.15Co0.15O2, LiNi0.8Mn0.1Co0.1O2, LiNi0.92Mn0.04Co0.04O2, and LiNi0.8Co0.15Al0.05O2. In some embodiments, the positive electrode binder includes at least one of polyvinylidene fluoride (PVDF), poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, fluorinated acrylate resin, polyacrylic acid, polyacrylonitrile, polyimide, polyurethane, polyvinyl butyral, polyvinylpyrrolidone (PVP), acrylic acid-acrylonitrile-acrylamide copolymer, and acrylic acid-acrylonitrile-acrylate copolymer.

[0065] The positive electrode binder of this application is not limited to the materials mentioned above, but also includes other materials that can be used as battery positive electrode binders. In some embodiments, the positive electrode conductive agent may include at least one of carbon, carbon black, graphite, expanded graphite, graphene, graphene nanosheets, superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon fibers, carbon nanofibers, graphitized carbon sheets, carbon nanotubes, carbon nanotubes, activated carbon, and mesoporous carbon. The positive electrode conductive agent of this application is not limited to the materials mentioned above, but also includes other materials that can be used as battery positive electrode conductive agents.

[0066] It should be understood that the electrochemical device 10 mentioned in this application includes any device in which an electrochemical reaction occurs to convert chemical energy into electrical energy and vice versa. Specific, non-limiting examples include all types of primary batteries, secondary batteries, fuel cells, solar cells, or capacitors. In particular, the electrochemical device 10 is a lithium secondary battery, including lithium metal secondary batteries, lithium-ion secondary batteries, lithium polymer secondary batteries, or lithium-ion polymer secondary batteries. In some embodiments, the electrochemical device 10 includes a positive electrode, a negative electrode, an electrolyte, and a separator, with the separator located between the positive and negative electrodes, and the separator used in the electrochemical device 10 is the separator described above in this application.

[0067] This application also proposes an electronic device, characterized by including an electrochemical device 10 as described in any of the above embodiments. Since the two ends of the first tab 130 are respectively connected to the first body 111 and the second body 112, and in the first direction, the third body 211 is located between the first body 111 and the second body 112, during the manufacturing process of the electronic device of this application, the second body 112 can be flipped relative to the first body 111 by bending the first tab 130, and thus stacked on the first body 111, while simultaneously placing the third body 211 between the first body 111 and the second body 112, resulting in higher production efficiency. On the other hand, the second tab 230 and the bent first tab 130 are arranged along the third direction, and both are located on one side of the first body 111 in the second direction. Therefore, the first tab 130 can utilize the space occupied by the second tab 230 in the second direction, resulting in a smaller overall space occupied by the electronic device.

[0068] On the other hand, since the first tab 130 and the second tab 230 are both located on the same side of the second direction, the arrangement of the first tab 130 and the second tab 230 is more compact, which is conducive to making the device used for electrical connection with the first tab 130 and the second tab 230 in the electronic device more compact, and can further reduce the overall space occupied by the electronic device.

[0069] It should be understood that the electronic device described in this application is not particularly limited and can be any electronic device known in the prior art. The electrochemical device 10 of this invention is not particularly limited in its use and can be used in any electronic device known in the prior art. According to some embodiments of the invention, the electronic devices include, but are not limited to, mobile phones, smartphones, laptops, tablets, wearable devices, smartwatches, smart bracelets, smart glasses, power banks, televisions, game consoles, game controllers, digital cameras, smart speakers, headphones, keyboards, mice, monitors, drones, audio equipment, home appliances, toys, power tools, automobiles, motorcycles, electric bicycles, bicycles, robots, robot dogs, industrial robots, android robots, etc.

[0070] Although illustrative embodiments have been demonstrated and described, those skilled in the art should understand that the above embodiments should not be construed as limiting the invention, and that changes, substitutions and modifications can be made to the embodiments without departing from the spirit, principles and scope of the invention.

Claims

1. An electrochemical device, characterized in that, include: The first electrode includes a first current collector, the first current collector includes a first body and a second body, the first body and the second body are stacked along a first direction; The second electrode includes a second current collector, the second current collector includes a third body, the third body being located between the first body and the second body; The first electrode further includes a first electrode tab, and the second electrode further includes a second electrode tab. The first electrode tab is located on one side of the first body in the second direction, with one end connected to the first body and the other end connected to the second body. The second electrode tab is located on one side of the second body in the second direction and is connected to the third body. The first electrode tab and the second electrode tab are spaced apart in the third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

2. The electrochemical device according to claim 1, characterized in that, The first current collector includes a plurality of first bodies and a plurality of second bodies, which are stacked alternately, with adjacent first bodies and second bodies defining a stacking gap; the second electrode includes a plurality of third bodies and a plurality of second electrodes, each third body being located in a different stacking gap and connected to a different second electrode. The first electrode further includes a plurality of first tabs, and the first current collector further includes a plurality of first bends; each first bend is located on the side of the first body opposite to the second direction; along the first direction, a plurality of first bodies and a plurality of second bodies are alternately connected through the first bends and the first tabs.

3. The electrochemical device according to claim 2, characterized in that, The second current collector further includes a plurality of fourth bodies, a plurality of second bends, and a plurality of third bends; along the first direction, the third bodies and the fourth bodies are alternately stacked and located at different stacking gaps, and each fourth body is connected to a different second tab; each second bend is located on one side of the third body in the third direction, and each third bend is located on the other side of the fourth body in the third direction, and along the first direction, the plurality of third bodies and the plurality of fourth bodies are alternately connected through the second bends and the third bends.

4. The electrochemical device according to claim 3, characterized in that, The first electrode includes multiple first active material layers, which are disposed on one side of the first body in the first direction and the side opposite to the first direction, and on one side of the second body in the first direction and the side opposite to the first direction; the second electrode includes multiple second active material layers, which are disposed on one side of the third body in the first direction and the side opposite to the first direction, and on one side of the fourth body in the first direction and the side opposite to the first direction.

5. The electrochemical device according to claim 4, characterized in that, The first electrode also includes a plurality of first insulating layers, each of which is disposed on the surface of a different first bend. And / or, the second electrode further includes a plurality of second insulating layers and a plurality of third insulating layers, each of the second insulating layers being disposed on the surface of a different second bend, and each of the third insulating layers being disposed on the surface of a different third bend.

6. The electrochemical device according to claim 3, characterized in that, The electrochemical device further includes a first membrane and a second membrane, the second current collector having a thickness direction, the first membrane being stacked on one side of the second current collector in the thickness direction, and the second membrane being stacked on the other side of the second current collector in the thickness direction.

7. The electrochemical device according to claim 1, characterized in that, The first electrode includes multiple first active material layers, which are disposed on one side of the first body in the first direction and the side opposite to the first direction, and on one side of the second body in the first direction and the side opposite to the first direction; the second electrode includes multiple second active material layers, which are disposed on one side of the third body in the first direction and the side opposite to the first direction.

8. The electrochemical device according to claim 1, characterized in that, Along the second direction, the first electrode extends beyond the second electrode.

9. The electrochemical device according to claim 1, characterized in that, One end of the first electrode is integrally connected to the first body, and the other end is integrally connected to the second body.

10. An electronic device, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 9.

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