Battery monomer and electric equipment

Abstract

The utility model provides a single battery and electric equipment, the single battery comprises a shell, the shell comprises a shell and a sealing plate, the shell is provided with a first opening, and a first end plate, a second end plate, a first side plate and a third side plate which define the first opening, and the first end plate and the second end plate are oppositely arranged along a first direction; the first side plate and the third side plate are oppositely arranged in the second direction. The sealing plate seals the first opening, and the first opening is configured to allow the electrolyte to pass through. Due to the fact that the area of the first opening is large, the electrode assembly can enter the shell conveniently through the first opening, the shell entering difficulty of the electrode assembly is reduced, electrolyte can be injected through the first opening so that the electrolyte can infiltrate the electrode assembly from multiple directions of the electrode assembly, the electrolyte injection speed is high, infiltration is fast, and the efficiency is improved. The wettability of the product is improved, and the qualification rate and the production efficiency of the product are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and an electrical device. Background Technology

[0002] With the rapid development of lithium battery technology, people have increasingly higher requirements for the performance of lithium batteries, including their energy density. Currently, blade-shaped packaging can effectively improve battery energy density, thus lithium battery products packaged in this form are attracting more and more attention. However, the packaging structure of existing blade batteries leads to problems such as difficulty in inserting electrode components into the casing, low production efficiency, and difficulty in electrolyte injection, resulting in low yield and high manufacturing costs. Utility Model Content

[0003] The purpose of this application is to provide a battery cell and a battery to solve the technical problems of low yield and low production efficiency caused by the structure of existing battery cells.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a battery cell is provided, comprising: a housing, including an outer shell and a sealing plate, the outer shell having a first opening and a first end plate, a second end plate, a first side plate, and a third side plate surrounding the first opening, the first end plate and the second end plate being disposed opposite to each other along a first direction, and the first side plate and the third side plate being disposed opposite to each other along a second direction; the sealing plate seals the first opening, wherein the first opening is configured to allow electrolyte to pass through.

[0005] In one or more embodiments of this application, the housing further includes a second side plate, the first side plate, the second side plate and the third side plate are sequentially connected to form a U-shaped structure, the U-shaped structure and the sealing plate form an accommodating cavity, the accommodating cavity has a second opening and a third opening disposed opposite to each other along a first direction, the first end plate seals the second opening, and the second end plate seals the third opening.

[0006] In one or more embodiments of this application, the first side plate and the second side plate are integrally formed, and the second side plate and the third side plate are integrally formed.

[0007] In one or more embodiments of this application, the outer casing has a first inner peripheral wall, a second inner peripheral wall, and a third inner peripheral wall disposed along a first direction. The first inner peripheral wall is located between a second opening and a second inner peripheral wall, and at least a portion of the first inner peripheral wall is connected to the second inner peripheral wall via a first stop surface. The third inner peripheral wall is located between a third opening and a second inner peripheral wall, and at least a portion of the third inner peripheral wall is connected to the second inner peripheral wall via a second stop surface. At least a portion of the first end plate is located within the accommodating cavity and contacts both the first stop surface and the first inner peripheral wall. At least a portion of the second end plate is located within the accommodating cavity and contacts both the second stop surface and the third inner peripheral wall.

[0008] In one or more embodiments of this application, the U-shaped structure has a first end face forming a second opening, the first end face being connected to a first inner peripheral wall; the first end plate has a first portion located within a receiving cavity and a second portion connected to the first portion, at least a portion of the outer peripheral surface of the first portion being connected to the outer peripheral surface of the second portion via a third stop surface; the first portion is in contact with the first stop surface, the outer peripheral surface of the first portion is in contact with the first inner peripheral wall, and the third stop surface is in contact with the first end face; and / or,

[0009] The U-shaped structure has a second end face forming a third opening, the second end face being connected to a third inner peripheral wall; the second end plate has a third portion located within the accommodating cavity and a fourth portion connected to the third portion, at least a portion of the outer peripheral surface of the third portion being connected to the outer peripheral surface of the fourth portion via a fifth stop surface; the third portion is in contact with the second stop surface, and the fifth stop surface is in contact with the second end face.

[0010] In one or more embodiments of this application, the housing further has a fourth inner peripheral wall located between the second opening and the first inner peripheral wall, the fourth inner peripheral wall being connected to the first inner peripheral wall via a fourth stop surface, and the fourth stop surface and the first stop surface being disposed opposite to each other; the edge portion of the first end plate is limited between the fourth stop surface and the first stop surface; and / or,

[0011] The housing also has a fifth inner peripheral wall located between the third opening and the third inner peripheral wall, the fifth inner peripheral wall being connected to the third inner peripheral wall via a sixth stop surface, and the sixth stop surface and the second stop surface being disposed opposite to each other; the edge portion of the second end plate is limited between the sixth stop surface and the second stop surface.

[0012] In one or more embodiments of this application, a first notch is provided on the side of the first side plate facing the third side plate. Both ends of the first notch along the first direction penetrate the first side plate, and the end of the first notch away from the second side plate penetrates the first side plate.

[0013] A second notch is provided on the side of the third side plate facing the first side plate. Both ends of the second notch penetrate the third side plate in the first direction, and the end of the second notch away from the second side plate also penetrates the third side plate. One end of the sealing plate in the second direction contacts the bottom of the first notch, and the other end of the sealing plate in the second direction contacts the bottom of the second notch.

[0014] or,

[0015] A first groove is provided on the side of the first side plate facing the third side plate. Both ends of the first groove penetrate the first side plate along the first direction. A second groove is provided on the side of the third side plate facing the first side plate. Both ends of the second groove penetrate the third side plate along the first direction. One end of the sealing plate along the second direction is limited between the two sidewalls of the first groove, and the other end of the sealing plate along the second direction is limited between the two sidewalls of the second groove.

[0016] In one or more embodiments of this application, the first stop surface and / or the second stop surface are annular; and / or, the third stop surface and / or the fifth stop surface are annular.

[0017] In one or more embodiments of this application, an insulating protective film and an electrode assembly are further included. The electrode assembly is housed within the housing, and the insulating protective film covers the electrode assembly. The insulating protective film has a plurality of through holes at least at a position directly opposite the first opening, or the overlapping portion of the first and last ends of the insulating protective film is directly opposite the first opening.

[0018] Secondly, this application provides an electrical device including a battery cell as described in any of the first aspects.

[0019] Based on the above technical solution, the battery cell and electrical equipment of this application have at least the following beneficial technical effects:

[0020] The battery cell provided in this application embodiment has a casing with an outer shell and a sealing plate. The outer shell has a first opening and a first end plate, a second end plate, a first side plate, and a third side plate surrounding the first opening. The first end plate and the second end plate are arranged opposite each other along a first direction, and the first side plate and the third side plate are arranged opposite each other along a second direction. The sealing plate is used to seal the first opening, which is configured to allow electrolyte to pass through. Since the area of ​​the first opening is large, it is convenient to insert the electrode assembly into the casing through the first opening, reducing the difficulty of inserting the electrode assembly into the casing. The electrolyte can be injected through the first opening, so that the electrolyte can wet the electrode assembly from multiple directions, making the injection speed fast and the wetting speed fast, improving the wetting performance of the product, and improving the product qualification rate and production efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of a battery cell according to one or more embodiments of this application;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the housing according to one or more embodiments of this application;

[0024] Figure 3 This is an exploded view of the casing of one or more embodiments of this application;

[0025] Figure 4 yes Figure 3 Enlarged view of point F in the image;

[0026] Figure 5 This is an exploded view of a battery cell according to one or more embodiments of this application;

[0027] Figure 6 This is a partial structural schematic diagram of the casing of one or more embodiments of this application;

[0028] Figure 7 yes Figure 6 Enlarged view of point A in the image;

[0029] Figure 8 yes Figure 6 Enlarged view of point D in the image;

[0030] Figure 9 This is a three-dimensional structural diagram of the first end plate according to one or more embodiments of this application;

[0031] Figure 10 This is a three-dimensional structural diagram of the second end plate according to one or more embodiments of this application;

[0032] Figure 11 This is a three-dimensional structural schematic diagram of the second end plate from another perspective of one or more embodiments of this application;

[0033] Figure 12 This is a schematic diagram of the structure of a battery cell according to one or more embodiments of this application;

[0034] Figure 13 yes Figure 12 Enlarged view of point B in the image;

[0035] Figure 14 yes Figure 12 Enlarged view of point C in the image;

[0036] Figure 15 This is a partial structural schematic diagram of the casing of one or more embodiments of this application;

[0037] Figure 16 yes Figure 15 Enlarged view of point E in the image;

[0038] Figure 17 yes Figure 15 Enlarged view of point G in the image.

[0039] Wherein, 10-first protective film; 20-shell; 21-outer shell; 22-sealing plate; 23-first end face; 24-second end face; 31-first end plate; 32-positive electrode post; 41-second end plate; 42-negative electrode post; 50-electrode assembly; 60-insulating protective film; 101-second protective film; 102-third protective film; 210-second opening; 211-first opening; 212-first side plate; 213-second side plate; 214-third side plate; 230-third opening; 251-first inner peripheral wall; 25 2-Second inner peripheral wall; 253-Third inner peripheral wall; 254-Fourth inner peripheral wall; 256-First stop surface; 257-Second stop surface; 258-Fourth stop surface; 259-Sixth stop surface; 2121-First notch; 2122-Second notch; 311-Third stop surface; 312-Second part; 313-First part; 411-Fifth stop surface; 412-Fourth part; 413-Third part; 501-Positive electrode tab; 502-Negative electrode tab; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0040] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0041] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0042] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0044] In related technologies, blade-shaped battery packaging can effectively improve product energy density, thus blade-shaped packaged batteries are attracting increasing attention. However, due to the packaging characteristics of blade batteries, the casing structure makes it difficult to insert electrode components during the manufacturing process, resulting in low production efficiency. Furthermore, the existing casing structure also means that the electrolyte is typically injected along the long axis of the blade, leading to difficulties in electrolyte wetting due to the long transport path, resulting in low battery yield and low production efficiency.

[0045] Based on the above considerations, in order to solve the technical problems of low yield and low production efficiency caused by the existing battery cell structure, this application provides a battery cell including a housing, the housing including an outer shell and a sealing plate, the outer shell having a first opening and a first end plate, a second end plate, a first side plate and a third side plate surrounding the first opening, the first end plate and the second end plate being disposed opposite to each other along a first direction, and the first side plate and the third side plate being disposed opposite to each other along a second direction; the sealing plate seals the first opening, wherein the first opening is configured to allow electrolyte to pass through.

[0046] In the technical solution of this application embodiment, the housing is configured to have an outer shell and a sealing plate. The outer shell has a first opening and a first end plate, a second end plate, a first side plate, and a third side plate surrounding the first opening. The first end plate and the second end plate are arranged opposite to each other along a first direction, and the first side plate and the third side plate are arranged opposite to each other along a second direction. The sealing plate is used to seal the first opening. The first opening is configured to allow electrolyte to pass through. Since the area of ​​the first opening is large, the electrode assembly can be easily inserted into the housing through the first opening, which reduces the difficulty of inserting the electrode assembly into the housing and improves production efficiency. At the same time, the electrolyte can be injected through the first opening so that the electrolyte can wet the electrode assembly from multiple directions, which makes the injection speed fast and the wetting speed fast, improves the wetting performance of the product, and improves the product qualification rate and production efficiency.

[0047] The battery cells in this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc. The battery cells in this application may be blade battery cells.

[0048] Example 1

[0049] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0050] Please refer to the above as well. Figure 1 , Figure 2 , Figure 3 and Figure 5This application provides a battery cell, including: a housing 20, the housing 20 including an outer shell 21 and a sealing plate 22, the outer shell 21 having a first opening 211 and a first end plate 31, a second end plate 41, a first side plate 212 and a third side plate 214 surrounding the first opening 211, the first end plate 31 and the second end plate 41 being disposed opposite to each other along a first direction X, and the first side plate 212 and the third side plate 214 being disposed opposite to each other along a second direction Y; the sealing plate 22 seals the first opening 211, wherein the first opening 211 is configured to allow electrolyte to pass through.

[0051] It is understood that the housing 20 is a component used to house the electrode assembly and electrolyte. The housing 20 can be a cuboid structure. The first end plate 31 and the second end plate 41 can be cover plates arranged opposite each other along a first direction X. The first direction X can be the length direction of the battery cell. The first end plate 31 and the second end plate 41 can be plate-like structures. The first end plate 31 and the second end plate 41 can be positive or negative electrode cover plates electrically connected to the electrode assembly 50. The first side plate 212 and the third side plate 214 can be components arranged opposite each other along a second direction Y. The first opening 211 can be an opening structure provided on the large side of the battery assembly 50 inside the housing 20, in which case the second direction Y is the width direction of the battery cell and the third direction Z is the thickness direction of the battery cell; the first opening 211 can also be an opening structure provided on the small side of the battery assembly 50 inside the housing 20, in which case the second direction Y is the thickness direction of the battery cell and the third direction Z is the width direction of the battery cell. The outer casing 21 is provided with a first opening 211. The sealing plate 22 may be a plate-like structure used to seal the first opening 211 so that an environment is formed inside the housing 20 that is isolated from the outside.

[0052] In the technical solution of this application embodiment, the housing 20 is configured to have an outer shell 21 and a sealing plate 22. The outer shell 21 has a first opening 211 and a first end plate 31, a second end plate 41, a first side plate 212 and a third side plate 214 surrounding the first opening 211. The first end plate 31 and the second end plate 41 are arranged opposite to each other along the first direction X, and the first side plate 212 and the third side plate 214 are arranged opposite to each other along the second direction Y. The sealing plate 22 is used to seal the first opening 211. The first opening 211 is configured to allow electrolyte to pass through. Since the area of ​​the first opening 211 is large, the electrode assembly can be easily inserted into the housing through the first opening 211, which reduces the difficulty of inserting the electrode assembly into the housing and improves production efficiency. At the same time, the electrolyte can be injected through the first opening so that the electrolyte can wet the electrode assembly from multiple directions, which makes the injection speed fast and the wetting speed fast, improves the wetting performance of the product, and improves the product qualification rate and production efficiency.

[0053] In some embodiments, please refer to Figure 5The electrode assembly 50 extends positive electrode tab 501 and negative electrode tab 502 from its two ends along the second direction Y, respectively. A first end plate 31 has a positive electrode post 32, and a second end plate 41 has a negative electrode post 42. The positive electrode post 32 of the first end plate 31 is directly welded to the positive electrode tab 501 to form an electrical connection. The negative electrode post 42 of the second end plate 41 is directly welded to the negative electrode tab 502 to form an electrical connection. The electrode post and tab of this application can be directly welded together without the need for an adapter, which can reduce manufacturing costs.

[0054] Of course, in some other embodiments, the positive terminal 32 of the first end plate 31 can also be connected to the positive terminal tab 501 through a positive terminal adapter, and the negative terminal 42 of the second end plate 41 can also be connected to the negative terminal tab 502 through a negative terminal adapter.

[0055] Please refer to the above as well. Figure 5 and Figure 6 In some embodiments, the outer casing 21 further includes a second side plate 213, and the first side plate 212, the second side plate 213 and the third side plate 214 are connected in sequence to form a U-shaped structure. The U-shaped structure and the sealing plate 22 form a receiving cavity. The receiving cavity has a second opening 210 and a third opening 230 that are arranged opposite to each other along the first direction X. The first end plate 31 seals the second opening 210 and the second end plate 41 seals the third opening 230.

[0056] In the technical solution of this application embodiment, the first side plate 212, the second side plate 213 and the third side plate 214 are connected in sequence to form a U-shaped structure, and the U-shaped structure, the first end plate 31 and the second end plate 41 together form a accommodating cavity for accommodating the electrode assembly 50 and the electrolyte. After the electrode assembly 50 is installed into the housing and the electrolyte is injected into the housing, the sealing plate 22 seals the first opening 211, completing the assembly of the battery cell and improving production efficiency.

[0057] It is understood that the U-shaped structure and the sealing plate 22 form a receiving cavity with a second opening 210 and a third opening 230, which are arranged opposite to each other along the first direction X, so as to facilitate the installation of the first end plate 31 and the second end plate 41.

[0058] Please refer to Figure 6 In some embodiments, the first side plate 212 and the second side plate 213 are integrally formed, and the second side plate 213 and the third side plate 214 are integrally formed.

[0059] It is understandable that the second side plate 213 extends and bends at one end along the second direction Y to form the first side plate 212, and the second side plate 213 extends and bends at the other end along the second direction Y to form the third side plate 214. Thus, the longitudinal section of the component formed by the first side plate 212, the second side plate 213 and the third side plate 214 is U-shaped, which facilitates processing and can improve processing efficiency.

[0060] Please refer to Figure 6 , Figure 7 and Figure 8 In some embodiments, the outer casing 21 has a first inner peripheral wall 251, a second inner peripheral wall 252, and a third inner peripheral wall 253 disposed along a first direction X. The first inner peripheral wall 251 is located between the second opening 210 and the second inner peripheral wall 252, and at least a portion of the first inner peripheral wall 251 is connected to the second inner peripheral wall 252 via a first stop surface 256. The third inner peripheral wall 253 is located between the third opening 230 and the second inner peripheral wall 252, and at least a portion of the third inner peripheral wall 253 is connected to the second inner peripheral wall 252 via a second stop surface 257. At least a portion of the first end plate 31 is located within the accommodating cavity and contacts both the first stop surface 256 and the first inner peripheral wall 251. At least a portion of the second end plate 41 is located within the accommodating cavity and contacts both the second stop surface 257 and the third inner peripheral wall 253.

[0061] It is understood that the first inner peripheral wall 251, the second inner peripheral wall 252, and the third inner peripheral wall 253 are all annular. The first inner peripheral wall 251 being located between the second opening 210 and the second inner peripheral wall 252 can be understood as the first inner peripheral wall 251 being closer to the second opening 210 than the second inner peripheral wall 252. At least a portion of the first inner peripheral wall 251 being connected to the second inner peripheral wall 252 via the first stop surface 256 can be understood as at least a portion of the first inner peripheral wall 251 not being flush with the second inner peripheral wall 252. The first stop surface 256 is perpendicular to the first direction X; specifically, the portion of the first inner peripheral wall 251 connected to the first stop surface 256 forms a notched structure. Similarly, the third inner peripheral wall 253 being located between the third opening 230 and the second inner peripheral wall 252 can be understood as the third inner peripheral wall 253 being closer to the third opening 230 than the second inner peripheral wall 252. At least a portion of the third inner peripheral wall 253 is connected to the second stop surface 257 and the second inner peripheral wall 252. This can be understood as at least a portion of the third inner peripheral wall 253 and the second inner peripheral wall 252 not being flush. The second stop surface 257 is perpendicular to the first direction X. Specifically, the portion of the second stop surface 257 connected to the third inner peripheral wall 253 forms a notched structure. At least a portion of the first end plate 31 is located within the accommodating cavity and contacts both the first stop surface 256 and the first inner peripheral wall 251. This can be understood as the portion of the first end plate 31 located within the accommodating cavity sealing the second opening 210 and being fitted with the notched structure located at the second opening 210. At least a portion of the second end plate 41 is located within the accommodating cavity and contacts both the second stop surface 257 and the third inner peripheral wall 253. This can be understood as the portion of the second end plate 41 located within the accommodating cavity sealing the third opening 230 and being fitted with the notched structure located at the third opening 230.

[0062] In the technical solution of this application embodiment, through the above-mentioned settings, the installation of the first end plate 31 is limited by the first stop surface 256, and the installation of the second end plate 41 is limited by the second stop surface 257. On the one hand, it facilitates the installation of the first end plate 31 and the second end plate 41. On the other hand, after the positive electrode post 32 of the first end plate 31 is electrically connected to the positive electrode tab 501 of the electrode assembly 50, a pulling force can be generated on the positive electrode tab 501 in the opposite direction to the electrode assembly, avoiding the risk of the positive electrode tab 501 being bent and its root easily inserting into the electrode assembly, thus causing a short circuit. Similarly, after the negative electrode post 42 of the second end plate 41 is electrically connected to the negative electrode tab 502, a pulling force can be generated on the negative electrode tab 502 in the opposite direction to the electrode assembly, avoiding the risk of the negative electrode tab 502 being bent and its root easily inserting into the electrode assembly, thus causing a short circuit, thereby improving the safety of the battery.

[0063] Further, please refer to Figure 7and Figure 9 as well as Figure 12 and Figure 13 In some embodiments, the U-shaped structure has a first end face 23 forming a second opening 210, the first end face 23 being connected to a first inner peripheral wall 251; the first end plate 31 has a first portion 313 located within the accommodating cavity and a second portion 312 connected to the first portion 313, at least a portion of the outer peripheral surface of the first portion 313 being connected via a third stop surface 311 and the outer peripheral surface of the second portion 312; the first portion 313 is in contact with the first stop surface 256, the outer peripheral surface of the first portion 313 is in contact with the first inner peripheral wall 251, and the third stop surface 311 is in contact with the first end face 23.

[0064] It can be understood that the first end face 23 and the first stop face 256 are parallel. The first portion 313 of the first end plate 31 is placed in the receiving cavity during installation, and the second portion 312 of the first end plate 31 is a component connected to the first portion 313 and located on the side of the first portion 313 away from the receiving cavity. The third stop face 311 is parallel to the first end face 23 or the first stop face 256. At least a portion of the outer peripheral surface of the first portion 313 is connected through the third stop face 311 and the outer peripheral surface of the second portion 312. This can be understood as the outer peripheral surface of the second portion 312 protruding from the outer peripheral surface of the first portion 313, that is, a stepped structure is formed between the outer peripheral surface of the second portion 312 and the outer peripheral surface of the first portion 313.

[0065] In the technical solution of this application embodiment, the above-mentioned arrangement facilitates the following when the first end plate 31 is installed at the second opening 210: not only does the first part 311 of the first end plate 31 contact the first stop surface 256 for stopping, but the third stop surface 311 of the first end plate 31 also contacts the first end surface 23 for stopping. Therefore, along the first direction X, the first end plate 31 can form multi-level stops, which increases the pulling force of the positive electrode post 32 on the positive electrode tab 501, making it less likely for the root of the tab to be inserted into the electrode assembly, thus improving the safety of the battery. It also facilitates the matching and installation of the first end plate 31 and the second opening 210, thereby improving production efficiency.

[0066] Please refer to Figure 8 , Figure 10 , Figure 11 as well as Figure 14 In some embodiments, the U-shaped structure has a second end face 24 forming a third opening 230, the second end face 24 being connected to a third inner peripheral wall 253; the second end plate 41 has a third portion 413 located within the accommodating cavity and a fourth portion 412 connected to the third portion 413, at least a portion of the outer peripheral surface of the third portion 413 being connected by a fifth stop surface 411 and the outer peripheral surface of the fourth portion 412; the third portion 413 is in contact with the second stop surface 257, and the fifth stop surface 411 is in contact with the second end face 24.

[0067] It can be understood that the second end face 24 and the second stop face 257 are parallel. The third part 413 of the second end plate 41 is placed inside the receiving cavity during installation. The fourth part 412 of the second end plate 41 is a component connected to the third part 413 and located on the side of the third part 413 away from the receiving cavity. The fifth stop face 411 is parallel to the second end face 24 or the second stop face 257. At least a portion of the outer peripheral surface of the third part 413 is connected to the outer peripheral surface of the fourth part 412 through the fifth stop face 411. It can be understood that the outer peripheral surface of the fourth part 412 is protruding from the outer peripheral surface of the third part 413, that is, a stepped structure is formed between the outer peripheral surface of the fourth part 412 and the outer peripheral surface of the third part 413.

[0068] In the technical solution of this application embodiment, the above-mentioned arrangement facilitates the following when the second end plate 41 is installed at the third opening 230: not only does the third part 413 of the second end plate 41 contact the second stop surface 257 for stopping, but the fifth stop surface 411 also contacts the second end surface 24 for stopping. Therefore, along the first direction X, the second end plate 41 can form multi-level stops, which increases the pulling force of the negative electrode post 42 on the negative electrode tab 502, making it less likely for the root of the tab to be inserted into the electrode assembly, thus improving the safety of the battery. It also facilitates the installation of the second end plate 41 and the third opening 230, thereby improving production efficiency.

[0069] Specifically, in this embodiment, please refer to Figure 6 , Figure 7 and Figure 8 The first stop surface 256 and / or the second stop surface 257 are annular. That is, the notch structure located at the second opening 210 and the notch structure located at the third opening 230 are both designed to be annular; and the step structure at the second end plate 41 and the step structure at the first end plate 31 are both designed to be annular.

[0070] In some embodiments, please refer to Figure 5 The battery cell also includes an insulating protective film 60 and an electrode assembly 50. The electrode assembly 50 is housed in the housing 20. The insulating protective film 60 covers the electrode assembly 50. The insulating protective film 60 has multiple through holes at least at the position directly opposite the first opening 211, or the overlapping part of the first end and the last end of the insulating protective film 60 is directly opposite the first opening 211.

[0071] The insulating protective film 60 can be a thin film material made of polyester fiber. The insulating protective film 60 can also be a Mylar film.

[0072] In the technical solution of this application embodiment, by providing multiple through holes at the position of the insulating protective film 60 directly opposite the first opening 211, or by having the overlapping part of the first end and the last end of the insulating protective film 60 directly opposite the first opening 211, the electrolyte can be wetted into the electrode assembly from the through holes or from the overlapping part when the electrolyte is injected through the first opening 211, thereby improving the wetting characteristics of the electrolyte, accelerating the injection rate, and improving the product qualification rate.

[0073] In some embodiments, please refer to Figure 5 The battery cell also includes a first protective film 10, which may be an insulating film. The first protective film 10 covers the outermost part of the casing 20 and provides protection and insulation for the battery cell.

[0074] In some embodiments, please refer to Figure 5 A second protective film 101 is provided on the outer side of the first end plate 31, and a third protective film 102 is provided on the outer side of the second end plate 41. Both the second protective film 101 and the third protective film 102 are insulating films, so as to protect and insulate the first end plate 31 and the second end plate 41 respectively through the second protective film 101 and the third protective film 102.

[0075] In some embodiments, the assembly method of the battery cell in this application may refer to the following:

[0076] Step 1: Connect the positive electrode tab 501 of the electrode assembly 50 to the positive electrode post 32 of the first end plate 31, and connect the negative electrode tab 502 of the electrode assembly 50 to the negative electrode post 42 of the second end plate 41.

[0077] Step 2: Wrap the insulating protective film 60 to connect the electrode assembly 50, the first end plate 31, the second end plate 41 and the insulating protective film 60 into a whole assembly;

[0078] Step 3: Place the above-mentioned overall components into the outer shell 21, and make the first stop surface 256, the first inner peripheral wall 251 and the first end face 23 at the first end plate 31 and the second opening 210 mate, and make the second end plate 41 mate with the second stop surface 257, the third inner peripheral wall 253 and the second end face 24 at the third opening 230.

[0079] Step 4: Weld the first end plate 31 to the outer shell 21, and weld the second end plate 41 to the outer shell 21;

[0080] Step 5: Inject electrolyte from the first opening 211;

[0081] Step 6: After the liquid injection is completed, weld the sealing plate 22 to the first opening 211 of the sealing shell 21.

[0082] On the other hand, this application also provides an electrical device including any of the battery cells described above.

[0083] The battery cells provided in this application can be used as power sources for electrical devices or as energy storage units for electrical devices. Electrical devices may include, but are not limited to, mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0084] Example 2

[0085] The basic structure of a single battery cell in this embodiment is the same as in Embodiment 1, except that: Please refer to... Figure 15 and Figure 16 The outer casing 21 also has a fourth inner peripheral wall 254 located between the second opening 210 and the first inner peripheral wall 251. The fourth inner peripheral wall 254 is connected to the first inner peripheral wall 251 via a fourth stop surface 258, and the fourth stop surface 258 and the first stop surface 256 are disposed opposite to each other. The edge portion of the first end plate 31 is limited between the fourth stop surface 258 and the first stop surface 256.

[0086] It is understood that the fourth inner peripheral wall 254 is annular, and the fourth inner peripheral wall 254 and the second inner peripheral wall 252 are flush. The first inner peripheral wall 251, the first stop surface 256 and the fourth stop surface 258 are located between the fourth inner peripheral wall 254 and the second inner peripheral wall 252. The part of the first inner peripheral wall 251 that is not flush with the second inner peripheral wall 252, the first stop surface 256 and the fourth stop surface 258 form a groove structure.

[0087] In the technical solution of this application embodiment, by setting a fourth inner peripheral wall 254 and a fourth stop surface 258 located between the second opening 210 and the first inner peripheral wall 251, the edge portion of the first end plate 31 can be limited between the fourth stop surface 258 and the first stop surface 256 when the first end plate 31 is installed. This can stop and limit the first end plate 31 along the first direction X, increase the pulling force of the positive electrode post 32 on the positive electrode tab 501, and prevent the root of the tab from being inserted backward into the electrode assembly, thereby improving the safety of the battery.

[0088] Please refer to Figure 17 In some embodiments, the housing 21 further has a fifth inner peripheral wall 255 located between the third opening 230 and the third inner peripheral wall 253, the fifth inner peripheral wall 255 being connected to the third inner peripheral wall 253 via a sixth stop surface 259, and the sixth stop surface 259 and the second stop surface 257 being disposed opposite to each other; the edge portion of the second end plate 41 is limited between the sixth stop surface 259 and the second stop surface 257.

[0089] It is understandable that the fifth inner peripheral wall 255 is annular, and the fifth inner peripheral wall 255 and the second inner peripheral wall 252 are flush. The sixth stop surface 259, the second stop surface 257 and the third inner peripheral wall 253 are located between the fifth inner peripheral wall 255 and the second inner peripheral wall 252. The part of the third inner peripheral wall 253 that is not flush with the second inner peripheral wall 252, the sixth stop surface 259 and the second stop surface 257 form a groove structure.

[0090] In the technical solution of this application embodiment, by setting a fifth inner peripheral wall 255 and a sixth stop surface 259 located between the third opening 230 and the third inner peripheral wall 253, the edge portion of the second end plate 41 can be limited between the sixth stop surface 259 and the second stop surface 257 during the installation of the second end plate 41. This can stop and limit the second end plate 41 along the first direction, increase the pulling force of the negative electrode post 42 on the negative electrode tab 502, and prevent the root of the tab from being inserted backward into the electrode assembly, thereby improving the safety of the battery.

[0091] Specifically, in this embodiment, the third stop surface 311 and / or the fifth stop surface 411 are annular. That is, the groove structure located at the second opening 210 and the groove structure located at the third opening 230 are both designed to be annular.

[0092] In the technical solution of this application embodiment, the above-described arrangement allows the first portion 313 of the first end plate 31 to more effectively stop on the first stop surface 256, and the third stop surface 311 to more effectively stop on the first end surface 23. The third portion 413 of the second end plate 41 can more effectively stop on the second stop surface 257, and the fifth stop surface 411 can more effectively stop on the second end surface 24, thereby improving the assembly efficiency and yield of the battery cells.

[0093] Example 3

[0094] The basic structure of a single battery cell in this embodiment is the same as in Embodiment 1, except that: Please refer to... Figure 3 and Figure 4 The first side plate 212 is provided with a first notch 2121 on the side facing the third side plate 214. Both ends of the first notch 2121 along the first direction X penetrate the first side plate 212, and the end of the first notch 2121 away from the second side plate 213 penetrates the first side plate 212.

[0095] Please refer to Figure 6 and Figure 7The third side plate 214 is provided with a second notch 2122 on the side facing the first side plate 212. Both ends of the second notch 2122 along the first direction X penetrate the third side plate 214, and the end of the second notch 2122 away from the second side plate 213 penetrates the third side plate 214. The sealing plate 22 is in contact with the bottom of the first notch 2121 at one end along the second direction Y, and the sealing plate 22 is in contact with the bottom of the second notch 2122 at the other end along the second direction Y.

[0096] It is understood that the first notch 2121 is a notch located on the side of the first side plate 212 facing the third side plate 214. The fact that both ends of the first notch 2121 penetrate the first side plate 212 along the first direction X can be understood as the first notch 2121 connecting to the first opening 211 and the third opening 230 along the first direction X. The fact that the side of the first notch 2121 away from the second side plate 213 penetrates the first side plate 212 can be understood as the first notch 2121 being open on the side away from the second side plate 213.

[0097] The second notch 2122 is a notch located on the side of the third side plate 214 facing the first side plate 212, and both ends of the second notch 2122 along the first direction X are connected to the first opening 211 and the third opening 230. The fact that the end of the second notch 2122 away from the second side plate 213 penetrates the third side plate 214 can be understood as the second notch 2122 being open on the side away from the second side plate 213.

[0098] In the technical solution of this application embodiment, through the above-described arrangement, one end of the sealing plate 22 along the second direction Y contacts the bottom of the first notch 2121, and the other end of the sealing plate 22 along the second direction Y contacts the bottom of the second notch 2122. This allows the edge of the sealing plate 22 to stop at the first notch 2121 and the second notch 2122 along the third direction Z and be sealed to the first opening 211, facilitating installation and improving assembly efficiency.

[0099] Example 4

[0100] The basic structure of a battery cell in this embodiment is the same as that in Embodiment 1, except that: a first groove is provided on the side of the first side plate 212 facing the third side plate 214, and both ends of the first groove penetrate the first side plate 212 along the first direction X; a second groove is provided on the side of the third side plate 214 facing the first side plate 212, and both ends of the second groove penetrate the third side plate 214 along the first direction X; wherein, one end of the sealing plate 22 along the second direction Y is limited between the two sidewalls of the first groove, and the other end of the sealing plate 22 along the second direction Y is limited between the two sidewalls of the second groove.

[0101] It is understood that the cross-sections of the first groove and the second groove are both U-shaped, and the two ends of the first groove and the second groove along the first direction X respectively penetrate the second opening 210 and the third opening 230.

[0102] In the technical solution of this application embodiment, the above-described arrangement allows one end of the sealing plate 22 along the second direction Y to be limited between the two sidewalls of the first groove, and the other end of the sealing plate 22 along the second direction Y to be limited between the two sidewalls of the second groove. This allows the edge of the sealing plate 22 to stop along the third direction Z and seal the connection between the first groove and the second groove and the first opening 211, facilitating installation and improving assembly efficiency.

[0103] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing (20) includes an outer shell (21) and a sealing plate (22), the outer shell (21) having a first opening (211) and a first end plate (31), a second end plate (41), a first side plate (212), and a third side plate (214) surrounding the first opening (211), the first end plate (31) and the second end plate (41) being disposed opposite each other along a first direction (X), and the first side plate (212) and the third side plate (214) being disposed opposite each other along a second direction (Y); the sealing plate (22) seals the first opening (211), wherein the first opening (211) is configured to allow electrolyte to pass through.

2. The battery cell according to claim 1, characterized in that, The outer shell (21) also includes a second side plate (213). The first side plate (212), the second side plate (213) and the third side plate (214) are connected in sequence to form a U-shaped structure. The U-shaped structure and the sealing plate (22) form a receiving cavity. The receiving cavity has a second opening (210) and a third opening (230) arranged opposite to each other along a first direction (X). The first end plate (31) seals the second opening (210) and the second end plate (41) seals the third opening (230).

3. The battery cell according to claim 2, characterized in that, The first side plate (212) and the second side plate (213) are integrally formed, and the second side plate (213) and the third side plate (214) are integrally formed.

4. The battery cell according to claim 2, characterized in that, The outer casing (21) has a first inner peripheral wall (251), a second inner peripheral wall (252), and a third inner peripheral wall (253) disposed along a first direction (X). The first inner peripheral wall (251) is located between the second opening (210) and the second inner peripheral wall (252), and at least a portion of the first inner peripheral wall (251) is connected to the second inner peripheral wall (252) via a first stop surface (256). The third inner peripheral wall (253) is located between the third opening (230) and the second inner peripheral wall (252). Between the second inner peripheral walls (252), and at least a portion of the third inner peripheral wall (253) is connected to the second inner peripheral wall (252) via the second stop surface (257); wherein at least a portion of the first end plate (31) is located within the accommodating cavity and contacts both the first stop surface (256) and the first inner peripheral wall (251), and at least a portion of the second end plate (41) is located within the accommodating cavity and contacts both the second stop surface (257) and the third inner peripheral wall (253).

5. The battery cell according to claim 4, characterized in that, The U-shaped structure has a first end face (23) forming the second opening (210), the first end face (23) being connected to the first inner peripheral wall (251); the first end plate (31) has a first portion (313) located within the accommodating cavity and a second portion (312) connected to the first portion (313), at least a portion of the outer peripheral surface of the first portion (313) being connected to the outer peripheral surface of the second portion (312) via a third stop surface (311); the first portion (313) is in contact with the first stop surface (256), the outer peripheral surface of the first portion (313) is in contact with the first inner peripheral wall (251), and the third stop surface (311) is in contact with the first end face (23); and / or, The U-shaped structure has a second end face (24) forming the third opening (230), the second end face (24) being connected to the third inner peripheral wall (253); the second end plate (41) has a third portion (413) located within the accommodating cavity and a fourth portion (412) connected to the third portion (413), at least a portion of the outer peripheral surface of the third portion (413) being connected to the outer peripheral surface of the fourth portion (412) via a fifth stop surface (411); the third portion (413) is in contact with the second stop surface (257), and the fifth stop surface (411) is in contact with the second end face (24).

6. The battery cell according to claim 4, characterized in that, The outer casing (21) further has a fourth inner peripheral wall (254) located between the second opening (210) and the first inner peripheral wall (251), the fourth inner peripheral wall (254) being connected to the first inner peripheral wall (251) via a fourth stop surface (258), and the fourth stop surface (258) and the first stop surface (256) being disposed opposite to each other; the edge portion of the first end plate (31) is confined between the fourth stop surface (258) and the first stop surface (256); and / or, The outer casing (21) also has a fifth inner peripheral wall (255) located between the third opening (230) and the third inner peripheral wall (253), the fifth inner peripheral wall (255) being connected to the third inner peripheral wall (253) via a sixth stop surface (259), and the sixth stop surface (259) and the second stop surface (257) being disposed opposite to each other; the edge portion of the second end plate (41) is limited between the sixth stop surface (259) and the second stop surface (257).

7. The battery cell according to any one of claims 2 to 6, characterized in that, The first side plate (212) is provided with a first notch (2121) on the side facing the third side plate (214). Both ends of the first notch (2121) along the first direction (X) penetrate the first side plate (212), and the end of the first notch (2121) away from the second side plate (213) penetrates the first side plate (212). The third side plate (214) has a second notch (2122) on the side facing the first side plate (212). Both ends of the second notch (2122) along the first direction (X) penetrate the third side plate (214), and the end of the second notch (2122) away from the second side plate (213) penetrates the third side plate (214). The sealing plate (22) has one end along the second direction (Y) in contact with the bottom of the first notch (2121), and the other end along the second direction (Y) in contact with the bottom of the second notch (2122). or, The first side plate (212) is provided with a first groove on the side facing the third side plate (214), and both ends of the first groove along the first direction (X) penetrate the first side plate (212). The third side plate (214) is provided with a second groove on the side facing the first side plate (212), and both ends of the second groove along the first direction (X) penetrate the third side plate (214). The sealing plate (22) is limited at one end along the second direction (Y) between the two groove sidewalls of the first groove, and the sealing plate (22) is limited at the other end along the second direction (Y) between the two groove sidewalls of the second groove.

8. The battery cell according to any one of claims 4 to 6, characterized in that, The first stop surface (256) and / or the second stop surface (257) are annular; and / or the third stop surface (311) and / or the fifth stop surface (411) are annular.

9. The battery cell according to claim 7, characterized in that, It also includes an insulating protective film (60) and an electrode assembly (50), the electrode assembly (50) being housed within the housing (20), the insulating protective film (60) covering the electrode assembly (50), the insulating protective film (60) having a plurality of through holes at least at a position directly opposite the first opening (211), or the overlapping portion of the first and last ends of the insulating protective film (60) directly opposite the first opening (211).

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

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