Battery monomer, electric equipment and adapter

Abstract

The utility model provides a battery monomer, electric equipment and an adapter, the battery monomer comprises a shell, an electrode assembly, a first end cover assembly and a first adapter, and the shell is provided with a first opening along a first direction; the electrode assembly is arranged in the shell and comprises a main body, the main body is provided with a first end face in the third direction, and a first tab is led out from the first end face of the main body; the first end cover assembly comprises a first end plate and a first electrode terminal arranged on the first end plate, and the first end plate seals the first opening; the first adapter comprises a first connecting part, a second connecting part and an adapter part connected between the first connecting part and the second connecting part, the first connecting part is electrically connected with the first tab, the second connecting part is electrically connected with the first electrode terminal, the adapter part comprises a first part and a second part, and a bending part is arranged between the first part and the second part; the first direction is perpendicular to the third direction. According to the battery monomer, the assembling convenience is improved, and meanwhile, the reliability of electric connection is improved.

Description

Technical Field

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

[0002] With the transformation of the global energy structure and the development of a low-carbon economy, the new energy field has gradually become the focus of attention. As a high-energy, high-power, and long-life energy storage device, batteries are being used more and more widely.

[0003] A battery typically includes at least one battery cell, which comprises a casing, an end cap, and an electrode assembly disposed within the casing. The end cap has electrode terminals. An adapter is usually required for electrical connection between the electrode terminals and the tabs of the electrode assembly. However, when the tabs and electrode terminals are located on different sides of the electrode assembly, the existing method of first sealing the end cap and casing and then connecting the adapter and electrode terminals together via through-welding places high demands on the assembly of the adapter and electrode terminals. That is, if there is a gap between the adapter and the electrode terminals, there is a risk of incomplete soldering, false soldering, or weld failure. Utility Model Content

[0004] The purpose of this application is to provide a battery cell, an electrical device, and an adapter to solve the technical problems of risks such as poor soldering, false soldering, or soldering failure in the adapter piece and electrode terminals of the battery cell in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a battery cell, comprising: a housing, an electrode assembly, a first end cap assembly, and a first adapter. The housing has a first opening along a first direction. The electrode assembly is disposed within the housing and includes a main body having a first end face perpendicular to a third direction, with a first tab extending from the first end face. The first end cap assembly includes a first end plate and a first electrode terminal disposed on the first end plate, the first end plate being closed within the first opening. The first adapter includes a first connecting portion, a second connecting portion, and an adapter portion connected between the first connecting portion and the second connecting portion. The first connecting portion is electrically connected to the first tab, and the second connecting portion is electrically connected to the first electrode terminal. The adapter portion includes a first part and a second part, with a bending portion between the first part and the second part, wherein the first direction is perpendicular to a third direction.

[0007] In one or more embodiments of this application, the bent portion is a weak structure, the weak structure includes a base, the base connects the first portion and the second portion, and the base is provided with at least one groove and / or at least one perforation.

[0008] In one or more embodiments of this application, when the substrate is provided with a groove, the groove is provided on the side of the substrate away from the electrode assembly, and / or the groove is provided on the side of the substrate facing the electrode assembly.

[0009] In one or more embodiments of this application, when the substrate is provided with grooves and perforations, one or more grooves are provided between two adjacent perforations along the second direction, or one or more perforations are provided between two adjacent grooves.

[0010] In one or more embodiments of this application, when the substrate is provided with multiple grooves, the multiple grooves are spaced apart along the second direction; or, when the substrate is provided with multiple perforations, the multiple perforations are spaced apart along the second direction.

[0011] In one or more embodiments of this application, the bent portion is a crease, and the first portion and the second portion are connected.

[0012] In one or more embodiments of this application, the length of the first part accounts for 30% to 70% of the total length of the adapter.

[0013] In one or more embodiments of this application, the main body has a second end face perpendicular to the first direction, the distance between the second end face and the end face in the housing where the first opening is provided is a; the length of the second part is b, the total length of the adapter part is d, and the distance between the end of the first electrode terminal away from the first end face and the end of the first end plate close to the first end face is c, wherein 1.1a≤db≤0.9c.

[0014] In one or more embodiments of this application, 1.5a≤db≤0.6c.

[0015] In one or more embodiments of this application, 5mm ≤ a ≤ 15mm, and / or, 20mm ≤ c ≤ 100mm.

[0016] In one or more embodiments of this application, a bend is provided between the first part and the first connecting part; and / or a bend is provided between the second part and the second connecting part.

[0017] In one or more embodiments of this application, an insulating layer is provided on the side of the first adapter facing the main body.

[0018] In one or more embodiments of this application, the width of the first connecting part is w1 along the second direction, and the length of the second connecting part is w2 along the third direction; the thickness of the first connecting part is t1, and the thickness of the second connecting part is t2, wherein w2≥w1, and 0.7≤(w2×t2) / (w1×t1)≤1.3.

[0019] Secondly, this application provides an electrical device including a battery cell as described in any of the first aspects.

[0020] Thirdly, this application provides an adapter for a battery cell, comprising: a first connecting portion, a second connecting portion, and an adapter portion, wherein the first connecting portion is used for electrical connection with a tab; the second connecting portion is used for electrical connection with an electrode terminal; and the adapter portion connects the first connecting portion and the second connecting portion, the adapter portion comprising a first part and a second part, and a bending part is provided between the first part and the second part.

[0021] In one or more embodiments of this application, the bent portion is a weak structure, the weak structure includes a base, the base connects the first portion and the second portion, and the base is provided with at least one groove and / or at least one perforation;

[0022] In one or more embodiments of this application, the bent portion is a crease, and the first portion and the second portion are connected.

[0023] In one or more embodiments of this application, a bend is provided between the first part and the first connecting part; and / or a bend is provided between the second part and the second connecting part.

[0024] In one or more embodiments of this application, the first part and the first connecting part are arranged at a first included angle α, and the first included angle α satisfies: 90°<α≤150°.

[0025] In one or more embodiments of this application, 95°≤α≤125°.

[0026] In one or more embodiments of this application, the first part and the second part are set at a second included angle β, and the second included angle β satisfies: 220°≤α+β≤300°.

[0027] In one or more embodiments of this application, 260°≤α+β≤280°.

[0028] In one or more embodiments of this application, the second part and the second connecting part are arranged at a third included angle γ, and the third included angle γ satisfies: 60°≤γ≤120°.

[0029] In one or more embodiments of this application, 80°≤γ≤100°.

[0030] Based on the above technical solutions, the battery cell, electrical equipment, and adapter provided in this application have at least the following beneficial technical effects:

[0031] The battery cell provided in this application embodiment has a first connecting part of the first adapter connected to the first tab of the electrode assembly, and a second connecting part of the first adapter connected to the first electrode terminal. The first adapter is improved so that after the first adapter is connected to the first tab and the first electrode terminal, the first end plate and the housing can be smoothly closed. The assembly difficulty of the first end plate and the housing is low, and the assembly efficiency of the first end plate and the housing is high. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is a three-dimensional structural diagram of a battery cell provided in one or more embodiments of this application.

[0034] Figure 2 This is an exploded structural diagram of a battery cell provided in one or more embodiments of this application.

[0035] Figure 3 This is a three-dimensional structural schematic diagram of the first adapter provided in one or more embodiments of this application.

[0036] Figure 4 This is a perspective view of a portion of a battery cell provided in one or more embodiments of this application.

[0037] Figure 5 This is a schematic diagram of the structure of some components of a battery cell provided in one or more embodiments of this application.

[0038] Figure 6 This is a top view of the first adapter provided in one or more embodiments of this application.

[0039] Figure 7 This is a front view structural schematic diagram of the first adapter provided in one or more embodiments of this application.

[0040] Figure 8 This is a schematic diagram of the first state structure of a battery cell provided in one or more embodiments of this application during installation.

[0041] Figure 9 This is a schematic diagram of the second state structure of a battery cell provided in one or more embodiments of this application during installation.

[0042] Figure 10 This is a schematic diagram of the third state structure of a battery cell during installation, provided in one or more embodiments of this application.

[0043] Figure 11 This is a structural schematic diagram of one state of the first adapter provided in one or more embodiments of this application.

[0044] Figure 12 This is a structural schematic diagram from another perspective of one state of the first adapter provided in one or more embodiments of this application.

[0045] Figure 13 This is a top view of one state of the first adapter provided in one or more embodiments of this application.

[0046] Figure 14 This is a left-side structural schematic diagram of one state of the first adapter provided in one or more embodiments of this application.

[0047] Figure 15 This is a flowchart illustrating the assembly method of the end cap assembly, adapter plate, and housing in the existing technology.

[0048] In the figure: 1-Battery cell; 10-Housing; 11-Electrode assembly; 12-First end cap assembly; 13-First adapter; 14-Second end cap assembly; 15-Second adapter; 101-First opening; 102-Second opening; 110-Main body; 111-First tab; 112-First end face; 113-Second end face; 114-Second tab; 121-First electrode terminal; 122-First end plate; 131-First connecting part; 132-Second connecting part; 133-Adapter part; 1331-First part; 1332-Second part; 1333-Bending part; 1334-Base; 1335-Groove; 136-Insulating layer; 141-Second end plate; 142-Second electrode terminal. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In related technologies, when end cap assemblies are provided at both ends of the battery cell casing, at least one end cap assembly can only be closed with the casing after the electrode assembly is installed. For battery cells with tabs and electrode terminals located on different sides, see [reference needed]. Figure 15 As shown, the adapter piece is first bent. During assembly, the electrode assembly with the adapter piece is inserted into the housing, the end cap assembly is then embedded into the housing, and finally the electrode post and the adapter piece are welded together by through welding.

[0054] In response, the inventors of this application discovered that due to processing and assembly errors, there is a risk of incomplete soldering, false soldering, or solder failure between the electrode terminals and the adapter pieces.

[0055] Based on the above considerations, in order to address the technical problems of risks such as poor soldering, false soldering, or weld failure in the adapter plates and electrode terminals of existing battery cells, please refer to the following: Figure 1 , Figure 2 and Figure 3 This application provides a battery cell including: a housing 10, an electrode assembly 11, a first end cap assembly 12, and a first adapter 13. The housing 10 has a first opening 101 along a first direction X. The electrode assembly 11 is disposed inside the housing 10 and includes a body 110. The body 110 has a first end face 112 perpendicular to a third direction Z, and a first electrode tab 111 extends from the first end face 112 of the body 110. The first end cap assembly 12 includes a first end plate 122 and a first electrode terminal 121 disposed on the first end plate 122. Plate 122 is closed in the first opening 101; the first adapter 13 includes a first connecting part 131, a second connecting part 132 and an adapter part 133 connected between the first connecting part 131 and the second connecting part 132. The first connecting part 131 is electrically connected to the first electrode tab 111, and the second connecting part 132 is electrically connected to the first electrode terminal 121. The adapter part 133 includes a first part 1331 and a second part 1332. A bending part 1333 is provided between the first part 1331 and the second part 1332, wherein the first direction X and the third direction Z are perpendicular to each other.

[0056] In the technical solution provided in this application embodiment, the first connecting portion 131 of the first adapter 13 is first welded to the first tab 111 of the electrode assembly 11. Then, the electrode assembly 11 is installed into the housing 10, ensuring that the second connecting portion 132 of the first adapter 131 can extend out of the housing 10 when the electrode assembly 11 is in place. After that, the second connecting portion 132 of the first adapter 131 is welded to the first electrode terminal 121, and the first end plate 122 is embedded into the housing 10. Thus, the first connecting portion 131 and the adapter portion 133 of the first adapter 131 can be bent relative to each other, and the adapter portion 133... The design of the first part 1331 and the second part 1332 being able to be bent relative to each other at the bending part 1333 allows the adapter part 133 to rotate around the connection between the adapter part 133 and the first connecting part 131 during the process of closing the first end plate 122 and the housing 10. The first end plate 122 rotates around the connection between the first part 1331 and the second part 1332, thereby ensuring that after the first adapter part 131 is connected to the first tab 111 and the first electrode terminal 121, the first end plate 122 and the housing 10 can be closed smoothly. The assembly difficulty of the first end plate 122 and the housing 10 is low, and the assembly efficiency of the first end plate 122 and the housing 10 is high.

[0057] The battery cell of 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., and the embodiments of this application are not limited thereto. The battery cell of this application may be cylindrical, flat, cuboid, or other shapes.

[0058] It should be noted that the housing 10 can be cuboid in shape and has an internal space for accommodating the electrode assembly 11. The electrode assembly 11 is the component where the electrochemical reaction occurs inside the battery cell. It can be formed by winding electrodes of opposite polarity and a separator located between the electrodes, or by stacking electrodes of opposite polarity and a separator located between the electrodes. The first direction X can be the length direction of the battery cell 1, the third direction Z can be the width direction of the battery cell 1, and the second direction Y can be the thickness direction of the battery cell 1. The first end plate 122 in the first end cap assembly 12 can be a rectangular plate structure that matches the shape of the first opening 101 of the housing 10. The first electrode terminal 121 and the first adapter 13 are both made of conductive material.

[0059] It should also be noted that, please refer to Figure 3The first adapter 131 is an integrally formed structure. The first connecting part 131 and the first electrode tab 111 are disposed on the same side and electrically connected. The adapter part 133 and the second connecting part 132 are both disposed on the same side as the first electrode terminal. The first part 1331 of the adapter part 133 is bendably connected to the first connecting part 131. A bending part 1333 is provided between the first part 1331 and the second part 1332 of the adapter part 133. The second part 1332 of the adapter part 133 is bendably connected to the second connecting part 132.

[0060] In some embodiments, please refer to Figure 3 The bent portion 1333 is a weak structure, which includes a base 1334. The base 1334 connects the first portion 1331 and the second portion 1332. The base 1334 is provided with at least one groove 1335 and / or at least one perforation.

[0061] The weak structure can be understood as being more easily deformable than the first part 1331 and the second part 1332, thus facilitating bending of the first part 1331 and the second part 1332 at the weak structure. The substrate 1334 can be integrally formed with the first part 1331 and the second part 1332. The perforation can be a through-hole structure formed by removing part of the material from the substrate 1334. The groove 1335 can be a recessed structure formed by removing part of the material from the substrate 1334.

[0062] In the technical solution of this application embodiment, by setting grooves 1335 and / or perforations on the substrate 1334 to remove part of the material, the strength of the substrate 1334 is reduced, making the substrate 1334 more easily deformed and bent compared to the first part 1331 and the second part 1332.

[0063] In some embodiments, when a groove 1335 is provided on the substrate 1334, the groove 1335 is provided on the side of the substrate 1334 away from the electrode assembly 11, and / or, the groove 1335 is provided on the side of the substrate 1334 facing the electrode assembly 11.

[0064] This can be understood as follows: along the thickness direction of the substrate 1334, a groove 1335 is formed by recessing on one side of the substrate 1334 away from the electrode assembly 11; or, along the thickness direction of the substrate 1334, a groove 1335 is formed by recessing on one side of the electrode assembly 11 of the substrate 1334; or, both sides of the substrate 1334 are recessed to form grooves 1335.

[0065] In the technical solution of this application embodiment, the above-mentioned arrangement makes it possible for the strength of the bending portion 1333 to be less than the strength of the first portion 1331 and the second portion 1332, making it easier for the first portion 1331 and the second portion 1332 to bend at the bending portion 1333.

[0066] It should be noted that, see Figure 11 In order to better thin the substrate 1334, the groove 1135 can be designed to extend to both ends of the second direction Y and penetrate the substrate 1334.

[0067] In some embodiments, when the substrate 1334 is provided with grooves 1335 and perforations, one or more grooves 1335 are provided between two adjacent perforations along the second direction Y, or one or more perforations are provided between two adjacent grooves 1335.

[0068] It is understandable that when the substrate 1334 has both grooves 1335 and through holes, the grooves 1335 and through holes can be spaced one at a time, or two or more through holes can be spaced between two adjacent grooves 1335, or two or more grooves 1335 can be spaced between two adjacent through holes. This is so that the strength of the bent portion 1333 is less than the strength of the first portion 1331 and the second portion 1332, making it easier for the first portion 1331 and the second portion 1332 to bend at the bent portion 1333.

[0069] In some embodiments, when a plurality of grooves 1335 are provided on the substrate 1334, the plurality of grooves 1335 are spaced apart along the second direction Y.

[0070] It is understandable that the second direction Y can be the thickness direction of the battery cell 1. The multiple grooves 1335 are spaced apart, which can be understood as two adjacent grooves 1335 being connected by the substrate 1334.

[0071] In some embodiments, when the substrate 1334 is provided with multiple perforations, the multiple perforations are spaced apart along the second direction Y. The multiple perforations being spaced apart can be understood as two adjacent perforations being connected through the substrate 1334.

[0072] In some embodiments, the bend 1333 is a crease, and the first part 1331 and the second part 1332 are connected.

[0073] In this application, the crease may be a mark or imprint formed by the relative bending of the first part 1331 and the second part 1332.

[0074] In the technical solution of this application embodiment, by designing the bending portion 1333 as a crease, it is convenient to bend the relative portion 1331 and the second portion 1332, and to facilitate the change of the angle between the first portion 1331 and the second portion 1332.

[0075] In some embodiments, the length of the first part 1331 accounts for 30% to 70% of the total length of the adapter part 133.

[0076] It is understandable that when the first part 1331 and the second part 1332 are on the same plane along the third direction Z, the length of the first part 1331 refers to the length of the first part 1331 along the third direction Z, and the total length of the transition part 133 includes the sum of the lengths of the first part 1331, the bent part 1333 and the second part 1332 along the third direction Z.

[0077] In the technical solution of this application embodiment, the above-described arrangement facilitates easier relative bending of the first part 1331 and the second part 1332, providing operational space for the second connecting part 132 connected to the second part 1332 to electrically connect with the first electrode terminal 121 of the first end cap assembly 12. Simultaneously, it facilitates rotating the first end plate 122 90 degrees around the connection point of the second part 1332 and the second connecting part 132 after the first electrode terminal 121 is electrically connected to the second connecting part 132, and pushing it towards the first opening 101 of the housing 10, so that the first end plate 122 can seal the first opening 101. This improves operational convenience while ensuring the reliability of the electrical connection and the safety of the battery.

[0078] In some embodiments, please refer to Figure 4 and Figure 5 The main body 110 has a second end face 113 perpendicular to the first direction X. The distance between the second end face 113 and the end face in the housing 10 where the first opening 101 is provided is a. The length of the second part 1332 is b. The total length of the transition part 133 is d. The distance between the end of the first electrode terminal 121 away from the first end face 112 and the end of the first end plate 122 close to the first end face 112 is c. Wherein, 1.1a≤db≤0.9c. In some embodiments, 1.5a≤db≤0.6c.

[0079] Wherein, the second end face 113 can be the outermost end face of the main body 110 of the electrode assembly 11 on the side closest to the first opening 101 in the first direction X. Distance a can be understood as the distance between the second end face 113 and the end face of the first opening 101 of the housing 10 after the first connecting part 131 of the first adapter 13 is electrically connected to the first tab 111 and the electrode assembly 11 is installed inside the housing 10. The length b of the second part 1332 can be understood as the length of the second part 1332 in the third direction Z. The total length d of the adapter 133 can be understood as the sum of the lengths of the first part 1331, the bent part 1333, and the second part 1332 in the third direction Z. Wherein, (db) can be understood as the sum of the lengths of the first part 1331 and the bent part 1333 in the third direction Z.

[0080] In the technical solution of this application embodiment, when the value of 'a' is larger, that is, after the electrode assembly 11 is inserted into the housing, the distance between the second end face 113 and the end face of the first opening 101 of the housing 10 is larger. Since the electrical connection between the second connecting part 132 and the first electrode terminal 121 requires a certain assembly gap, the required value of (db) is larger. If the value of (db) is small, it is not easy to bend the second part 1332 relative to the first part 1331 to move the second connecting part 132 away from the electrode assembly 11, thereby providing sufficient operating space for the electrical connection between the second connecting part 132 and the first electrode terminal 121 of the first end cap assembly 12. At the same time, the value of (db) needs to be less than the value of 'c' so that the second connecting part 132 can be electrically connected to the first electrode terminal 121 of the first end cap assembly 12, ensuring sufficient electrical connection length. Through the above settings, on the one hand, it can be ensured that the second connecting part 132 and the first electrode terminal 121 can be effectively electrically connected, ensuring the overcurrent area; on the other hand, it can provide sufficient operating space and assembly gap for the electrical connection between the two, improving assembly efficiency and ensuring the reliability of the electrical connection.

[0081] In some embodiments, 5mm ≤ a ≤ 15mm. Since the value of a includes the sum of the thickness of the second connecting part 132, the thickness of the adapter part 133, the thickness of the first electrode terminal 121 located inside the first end plate 122, and the thickness of the first end plate 122, when the value of a is less than 5mm, it is not conducive to the overcurrent and strength after the electrical connection between the first connecting part 132 and the first electrode terminal 121. When the value of a is greater than 15mm, it will lead to a waste of space resources. Therefore, through the above setting, the overcurrent and strength can be guaranteed, while the space utilization rate can be improved.

[0082] It should be noted that the value of 'a' can be 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, or 15mm.

[0083] In some embodiments, 20mm ≤ c ≤ 100mm. In the technical solution of this application embodiment, the above settings are used so that the length of the first electrode terminal 121 can meet the overcurrent requirement, and at the same time, the current path can be shortened to reduce the resistance. When the value of c is less than 20mm, the first electrode terminal 121 cannot meet the overcurrent requirement. When the value of c is greater than 100mm, the current path is too long and the resistance is too large.

[0084] It should be noted that c can take the values ​​of 20mm, 22mm, 25mm, 33mm, 38mm, 44mm, 47mm, 58mm, 62mm, 69mm, 73mm, 77mm, 83mm, 85mm, 89mm, 93mm, 96mm, 98mm, or 100mm.

[0085] In some embodiments, please refer to Figure 3A bend 1333 is provided between the first part 1331 and the first connecting part 131.

[0086] It is understood that the bend 1333 located between the first part 1331 and the first connecting part 131 can be any of the aforementioned weak structures, or it can be a crease.

[0087] In the technical solution of this application embodiment, by providing a bending portion 1333 between the first portion 1331 and the first connecting portion 131, the first portion 1331 can be bent more easily relative to the first connecting portion 131. This is beneficial because after the first adapter 12 connects the first tab 111 and the first electrode terminal 121, the angle between the first portion 1331 and the first connecting portion 131 can be adjusted by bending the first portion 1331 relative to the first connecting portion 131, making it easier for the first end plate 122 to be embedded into the housing 10.

[0088] In some embodiments, a bend 1333 is provided between the second part 1332 and the second connecting part 132.

[0089] It is understood that the bend 1333 located between the second part 1332 and the second connecting part 132 can be any of the aforementioned weak structures, or it can be a crease.

[0090] In the technical solution of this application embodiment, by providing a bending portion 1333 between the second part 1332 and the second connecting part 132, the second connecting part 132 and the second part 1332 can be bent relative to each other. This is beneficial for welding the second connecting part 132 to the first electrode terminal 121 to achieve electrical connection. After this, the angle between the second connecting part 132 and the second part 1332 can be adjusted so that the first end plate 122 is perpendicular to each other along the first direction X, thereby facilitating the embedding of the first end plate 122 into the housing 10.

[0091] In some embodiments, please refer to Figure 3 An insulating layer 136 is provided on the side of the first adapter 13 facing the main body 110.

[0092] The insulating layer 136 may be insulating tape, insulating coating, or plastic. The insulating layer 136 may be attached to the side of the first adapter 13 facing the body 110 of the electrode assembly 11. The insulating layer 136 may be disposed in the area of ​​the first adapter 13 other than the area connected to the first tab 111.

[0093] In the technical solution of this application embodiment, the above-mentioned settings are used to insulate the first adapter 13 from the main body 110 of the electrode assembly 11, thereby avoiding short circuits and battery safety issues.

[0094] In some embodiments, please refer to Figure 6 and Figure 7 Along the second direction Y, the width of the first connecting portion 131 is w1, and along the third direction Z, the length of the second connecting portion 132 is w2; the thickness of the first connecting portion 131 is t1, and the thickness of the second connecting portion 132 is t2, wherein w2 ≥ w1, and 0.7 ≤ (w2 × t2) / (w1 × t1) ≤ 1.3. In some embodiments, w2 ≥ 1.2 × w1.

[0095] Here, w2×t2 can be understood as the current flow area in the second connection 132. w1×t1 can be understood as the current flow area in the first connection 131.

[0096] In the technical solution of this application embodiment, by making the length w2 of the second connecting portion 132 greater than the width w1 of the first connecting portion 131, especially w2 ≥ 1.2 × w1, the thickness t2 of the second connecting portion 132 can be reduced. By satisfying the above relationship, the connection area between the first electrode terminal 121 and the second connecting portion 132 can be made comparable to the overcurrent area of ​​the connection area between the first electrode tab 111 and the first connecting portion 131.

[0097] Please see Figure 8 , Figure 9 and Figure 10 The assembly method of the first end cap assembly 12, the first adapter 13, and the housing 10 in this application can be referred to as follows:

[0098] First, refer to Figure 8 After welding the first connecting part 131 to the first electrode tab 111, the electrode assembly 11 is placed inside the housing 10. At this time, the second connecting part 132, the second part 1332, the bent part 1333 and part of the first part 1331 extend out of the housing 10, and then the second connecting part 132 and the first electrode terminal 121 are welded together.

[0099] Secondly, please refer to Figure 9 After the second connecting part 132 and the first electrode terminal 121 are welded together, the first end plate 122 is controlled to bend around the connection between the second connecting part 132 and the second part 1332 until the first end plate 122 and the first direction X are perpendicular to each other.

[0100] The edge of the first end plate 122 near the first connecting part 131 still extends a certain distance e beyond the edge of the housing 10;

[0101] Finally, please see Figure 10Then, a force is applied to move the first end plate 122 toward the electrode assembly 11. At this time, the first part 1331 will bend around the connection between the first part 1331 and the first connecting part 131, and the second part 1332 will bend around the connection between the first part 1331 and the second part 1332. This allows the first end plate 122 to move toward the electrode assembly 11 along the first direction X while also moving away from the first end face 112 along the third direction Z. During the closing process of the first end plate 122 and the housing, the distance by which the first end plate 122 moves away from the first end face 112 along the third direction Z is e, and 0 < e ≤ 6 mm. Preferably, 0.5 mm ≤ e ≤ 3 mm, and e can take the values ​​of 0.5 mm, 0.7 mm, 0.9 mm, 1.2 mm, 1.5 mm, 2.1 mm, 2.4 mm, 2.7 mm, or 3 mm.

[0102] In some embodiments, please refer to Figure 2 The housing 10 has a second opening 102 at the other end along the first direction X, and a second tab 114 extends from the first end face 112 of the body 110 of the electrode assembly 11. The battery cell also includes a second end cap assembly 14 and a second adapter 15. The second end cap assembly 14 includes a second end plate 141 and a second electrode terminal 142 located on the second end plate 141. The second end plate 141 is used to close the second opening 120. The second adapter 15 includes a first connecting portion 131 and a second connecting portion 132. The first connecting portion 131 is located on one side of the first end face 112 and is electrically connected to the second tab 114. The second connecting portion 132 is located on one side of the second end face 113 and is electrically connected to the second electrode terminal 142.

[0103] In some embodiments, a battery cell may simultaneously have a first end cap assembly 12 and a second end cap assembly 14. The second electrode terminal 142 may be electrically connected to the second part 1332 of the second adapter 15. Then, the first part 1331 of the second adapter 15 and the first part 1331 of the first adapter 13 may be electrically connected to the second tab 114 and the first tab 111, respectively. Then, the electrode assembly 11 together with the second end cap assembly 14 may be installed into the housing 10 through the second opening 102, so that the second end plate 141 closes the second opening 102. Finally, the first electrode terminal 121 may be electrically connected to the second part 1332 of the first adapter 13, and the second part 1332 together with the first end plate 122 may be bent so that the first end plate 122 closes the first opening 101.

[0104] In some embodiments, the second adapter 15 may be a component with the same structure as the first adapter 13, in which case the assembly method of the second end cap assembly 14 is the same as the assembly method of the first end cap assembly 12. The second adapter 15 may also be an adapter in the related art to connect the second tab 114 and the second electrode terminal 142.

[0105] Secondly, embodiments of this application also provide an electrical device, including a battery cell as described in any of the first aspects.

[0106] 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.

[0107] Thirdly, please refer to Figure 11 and Figure 12 This application also provides an adapter for a battery cell in the first aspect, including: a first connecting part 131, a second connecting part 132 and an adapter part 133. The first connecting part 131 is used for electrical connection with a tab; the second connecting part 132 is used for electrical connection with an electrode terminal; the adapter part 133 connects the first connecting part 131 and the second connecting part 132. The adapter part 133 includes a first part 1331 and a second part 1332, and a bending part 1333 is provided between the first part 1331 and the second part 1332.

[0108] In the technical solution of this application embodiment, by providing a transition portion 133 between the first connecting portion 131 and the second connecting portion 132, the transition portion 133 allows the first connecting portion 131 to be electrically connected to the tab, and the second connecting portion 132 to be electrically connected to the electrode terminal. The transition portion 133 has a first portion 1331, a second portion 1332, and a bending portion 1333 located between the first portion 1331 and the second portion 1332. The bending portion 1333 allows the first portion 1331 and the second portion 1332 to bend at an angle, and the transition portion 133 rotates around the connection point between the transition portion 133 and the first connecting portion 131. This ensures that after the first adapter 131 connects the first tab 111 and the first electrode terminal 121, the first end plate 122 and the housing 10 can be smoothly closed. Furthermore, it provides operating space for the electrical connection between the second connecting portion 132 and the electrode terminal, improving assembly convenience and the reliability of the electrical connection.

[0109] In some embodiments, the bending portion 1333 is a weak structure, which includes a base 1334. The base 1334 connects the first portion 1331 and the second portion 1332. The base 1334 is provided with at least one groove 1335 and / or at least one perforation.

[0110] In the technical solution of this application embodiment, by setting grooves 1335 and / or perforations on the substrate 1334 to remove part of the material, the strength of the substrate 1334 is reduced, making the substrate 1334 more easily deformed and bent compared to the first part 1331 and the second part 1332.

[0111] It should be noted that the arrangement of the groove 1335 and / or perforation in the substrate 1334 can be referred to the description of the first adapter in the battery cell above, and will not be repeated here.

[0112] In some embodiments, the bend 1333 is a crease, and the first part 1331 and the second part 1332 are connected.

[0113] In the technical solution of this application embodiment, by designing the bending portion 1333 as a crease, it is convenient to bend the relative portion 1331 and the second portion 1332, and to facilitate the change of the angle between the first portion 1331 and the second portion 1332.

[0114] In some embodiments, a bending portion 1333 is provided between the first portion 1331 and the first connecting portion 131.

[0115] It is understood that the bend 1333 located between the first part 1331 and the first connecting part 131 can be any of the aforementioned weak structures, or it can be a crease.

[0116] In the technical solution of this application embodiment, the bending portion 1333 provided between the first part 1331 and the first connecting part 131 facilitates the relative bending of the first part 1331 and the first connecting part 131, thereby facilitating the closing operation.

[0117] In some embodiments, a bend 1333 is provided between the second part 1332 and the second connecting part 132.

[0118] It is understood that the bend 1333 located between the second part 1332 and the second connecting part 132 can be any of the aforementioned weak structures, or it can be a crease.

[0119] In the technical solution of this application embodiment, by providing a bending portion 1333 between the second part 1332 and the second connecting part 132, the second connecting part 132 and the second part 1332 can be bent relative to each other, which improves the convenience of operation and also ensures the reliability of electrical connection.

[0120] In some embodiments, please refer to Figure 13 The first part 1331 and the first connecting part 131 are set at a first included angle α, and the first included angle α satisfies: 90°<α≤150°; optionally, 95°≤α≤125°.

[0121] In the technical solution of this application embodiment, by setting the first included angle α within the aforementioned range, the second connecting part 132 can extend from the housing 10 for operation during welding. Simultaneously, after welding, the end cap and the second connecting part 132 can be pushed into the housing 10, improving space utilization. When the first included angle α is less than 90°, it is insufficient for the second connecting part 132 to extend beyond the housing 10 for welding with the electrode terminals of the end cap. When the first included angle α is greater than 150°, the subsequent distance for pushing the end cap and the second connecting part 132 into the housing 10 is too large, reducing space utilization.

[0122] In some embodiments, the first part 1331 and the second part 1332 are arranged at a second included angle β, which satisfies: 220°≤α+β≤300°; optionally, 260°≤α+β≤280°.

[0123] In the technical solution of this application embodiment, the above-mentioned arrangement allows the second part 1332 to be approximately perpendicular to the first connecting part 131, and the second part 1332 to abut against the second end face 113 of the main body 110 of the electrode assembly 11, preventing the main body 110 from moving left and right.

[0124] In some embodiments, please refer to Figure 14 The second part 1332 and the second connecting part 132 are set at a third included angle γ, and the third included angle γ satisfies: 60°≤γ≤120°, and optionally, 80°≤γ≤100°.

[0125] In the technical solution of this application embodiment, the above-mentioned arrangement makes it easier to electrically connect the second connecting part 132 with the electrode terminal of the end cap, and facilitates better welding of the second connecting part 132 and the electrode terminal using laser.

[0126] 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 (10) has a first opening (101) along a first direction (X); An electrode assembly (11) is disposed within the housing (10). The electrode assembly (11) includes a body (110), the body (110) having a first end face (112) perpendicular to a third direction (Z), and a first tab (111) extending from the first end face (112) of the body (110). The first end cap assembly (12) includes a first end plate (122) and a first electrode terminal (121) disposed on the first end plate (122), wherein the first end plate (122) is closed in the first opening (101); The first adapter (13) includes a first connecting part (131), a second connecting part (132), and an adapter part (133) connected between the first connecting part (131) and the second connecting part (132). The first connecting part (131) is electrically connected to the first electrode tab (111), and the second connecting part (132) is electrically connected to the first electrode terminal (121). The adapter part (133) includes a first part (1331) and a second part (1332). A bending part (1333) is provided between the first part (1331) and the second part (1332). The first direction (X) and the third direction (Z) are perpendicular to each other.

2. The battery cell according to claim 1, characterized in that, The bent portion (1333) is a weak structure, which includes a base (1334) that connects the first portion (1331) and the second portion (1332). The base (1334) is provided with at least one groove (1335) and / or at least one perforation.

3. The battery cell according to claim 2, characterized in that, When the substrate (1334) is provided with a groove (1335), the groove (1335) is provided on the side of the substrate (1334) away from the electrode assembly (11), and / or, the groove (1335) is provided on the side of the substrate (1334) facing the electrode assembly (11).

4. The battery cell according to claim 2, characterized in that, When the substrate (1334) is provided with grooves (1335) and perforations, along the second direction (Y), one or more grooves (1335) are provided between two adjacent perforations, or one or more perforations are provided between two adjacent grooves (1335).

5. The battery cell according to claim 2, characterized in that, When the substrate (1334) is provided with a plurality of grooves (1335), the plurality of grooves (1335) are spaced apart along the second direction (Y); or, when the substrate (1334) is provided with a plurality of perforations, the plurality of perforations are spaced apart along the second direction (Y).

6. The battery cell according to claim 1, characterized in that, The bent portion (1333) is a crease, and the first portion (1331) and the second portion (1332) are connected.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The length of the first part (1331) accounts for 30% to 70% of the total length of the adapter part (133).

8. The battery cell according to any one of claims 1 to 6, characterized in that, The main body (110) has a second end face (113) perpendicular to the first direction (X), the distance between the second end face (113) and the end face in the housing (10) where the first opening (101) is provided is a; the length of the second part (1332) is b, the total length of the adapter part (133) is d, and the distance between the end of the first electrode terminal (121) away from the first end face (112) and the end of the first end plate (122) close to the first end face (112) is c, wherein 1.1a≤db≤0.9c, and optionally, 1.5a≤db≤0.6c.

9. The battery cell according to claim 8, characterized in that, 5mm≤a≤15mm, and / or, 20mm≤c≤100mm.

10. The battery cell according to any one of claims 1 to 6, characterized in that, A bend (1333) is provided between the first part (1331) and the first connecting part (131); and / or a bend (1333) is provided between the second part (1332) and the second connecting part (132).

11. The battery cell according to any one of claims 1 to 6, characterized in that, The first adapter (13) has an insulating layer (136) on the side facing the main body (110).

12. The battery cell according to any one of claims 1 to 6, characterized in that, Along the second direction (Y), the width of the first connecting part (131) is w1, and along the third direction (Z), the length of the second connecting part (132) is w2; the thickness of the first connecting part (131) is t1, and the thickness of the second connecting part (132) is t2, wherein w2≥w1, and 0.7≤(w2×t2) / (w1×t1)≤1.

3.

13. An electrical appliance, characterized in that, Includes the battery cell as described in any one of claims 1 to 12.

14. An adapter for a battery cell, characterized in that, include: The first connecting part (131) is used for electrical connection with the electrode tab; The second connecting part (132) is used for electrical connection with the electrode terminal; The adapter (133) connects the first connecting part (131) and the second connecting part (132). The adapter (133) includes a first part (1331) and a second part (1332), and a bending part (1333) is provided between the first part (1331) and the second part (1332).

15. The adapter according to claim 14, characterized in that, The bent portion (1333) is a weak structure, the weak structure includes a base (1334), the base (1334) connects the first portion (1331) and the second portion (1332), and the base (1334) is provided with at least one groove (1335) and / or at least one perforation; Alternatively, the bent portion (1333) is a crease, and the first portion (1331) and the second portion (1332) are connected.

16. The adapter according to claim 14 or 15, characterized in that, A bend (1333) is provided between the first part (1331) and the first connecting part (131); and / or a bend (1333) is provided between the second part (1332) and the second connecting part (132).

17. The adapter according to claim 16, characterized in that, The first part (1331) and the first connecting part (131) are arranged at a first included angle (α), and the first included angle (α) satisfies: 90°<α≤150°; optionally, 95°≤α≤125°; And / or, the first part (1331) and the second part (1332) are set at a second included angle (β), the second included angle (β) satisfying: 220°≤α+β≤300°; optionally, 260°≤α+β≤280°; And / or, the second part (1332) and the second connecting part (132) are arranged at a third included angle (γ), the third included angle (γ) satisfying: 60°≤γ≤120°, optionally, 80°≤γ≤100°.

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