Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment, and relates to the technical field of batteries. The battery cell provided by the utility model comprises an electrode terminal and an adapter. The side surface of the electrode terminal comprises a first supporting region; the adapter is used for being electrically connected with the electrode assembly; the side face of the adapter comprises a second supporting area, the second supporting area and the first supporting area are opposite in the first direction and support each other, and the outline of the first supporting area is matched with the outline of the second supporting area; in the first supporting area and the second supporting area, a first protrusion facing the other one is formed on the first supporting area, the other one and the first protrusion are mutually supported in the first direction, and the mutually-supported areas are welded. The battery monomer provided by the utility model is relatively high in reliability.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell, a battery, and an electrical device. Background Art

[0002] In the related art, the welding between the adapter of the battery cell and the electrode terminal is not reliable enough, resulting in poor reliability of the battery cell. Summary of the Utility Model

[0003] This application provides a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0004] In a first aspect, this application provides a battery cell, which includes an electrode terminal and an adapter. The side surface of the electrode terminal includes a first support area; the adapter is used for electrically connecting with the electrode assembly; the side surface of the adapter includes a second support area, and the second support area is opposite to and supports the first support area along a first direction, and the contour of the first support area matches the contour of the second support area; wherein, in the first support area and the second support area, a first protrusion facing the other is formed on one of them, and the other supports the first protrusion along the first direction, and the areas in mutual support are welded.

[0005] By making the other of the first support area and the second support area support the first protrusion along the first direction, and welding the areas in mutual support, it is beneficial to make the parts where the electrode terminal and the adapter are welded together abut more closely, and the mutual abutting force applied is greater, which is beneficial to the reliability of welding, the welding strength is higher, and it is also beneficial to reduce the risk of false welding, thereby improving the reliability of the battery cell.

[0006] In some implementation manners of this application, the contour of the area in mutual support matches the contour of the end face of the end of the first protrusion.

[0007] By making the contour of the area in mutual support match the contour of the end face of the end of the first protrusion, it is beneficial to improve the reliability of the welding between the adapter and the electrode terminal.

[0008] In some implementation manners of this application, among the first support area and the second support area, the one that supports the first protrusion is a plane and is perpendicular to the first direction; or, among the first support area and the second support area, the one that supports the first protrusion forms a second protrusion facing the first protrusion and supports the first protrusion through the second protrusion; or, among the first support area and the second support area, the one that supports the first protrusion forms a concave portion corresponding to the first protrusion, the depth of the concave portion is less than the height of the first protrusion, and among the first support area and the second support area, the one that supports the first protrusion supports the first protrusion through the bottom surface of the concave portion.

[0009] By making the other of the first support region and the second support region planar, the manufacturing of the other is more convenient, and the other can abut against the first protrusion more closely, which is beneficial to the reliability of welding. By forming a second protrusion on the other corresponding to the first protrusion, and the other is supported by the second protrusion and the first protrusion, it is beneficial to further improve the tightness of the abutment of the mutually welded parts of the electrode terminal and the adapter, thereby further improving the reliability of welding. By making the other supported by the bottom surface of the concave portion and the first protrusion, the cooperation between the concave portion and the first protrusion can achieve a good positioning effect on the welding area of the electrode terminal and the adapter, and is also beneficial to improving the tightness of assembly, thereby being beneficial to improving the reliability of welding.

[0010] In some implementation manners of the present application, the adapter is in a sheet-like structure, the adapter and the electrode terminal are arranged oppositely along a first direction, and the adapter is bent along the first direction to form a first protrusion.

[0011] By bending the adapter along the first direction to form a first protrusion, it is beneficial to improve the convenience of manufacturing the first protrusion, and is also beneficial to making the first protrusion have greater flexibility, facilitating compression along the first direction by the second of the first support region and the second support region, so that the first support region and the second support region are closely attached together, which is beneficial to the tightness of the assembly of the electrode terminal and the adapter.

[0012] In some implementation manners of the present application, the first protrusion is in an annular structure, the axial direction of the annular structure is the first direction, and the extension path of the welding area between the electrode terminal and the adapter matches the extension path of the annular structure.

[0013] By making the extension path of the welding area between the electrode terminal and the adapter match the extension path of the annular structure, the extension length of the welding area between the electrode terminal and the adapter is larger and in a closed annular shape, which is beneficial to improving the reliability of welding.

[0014] In some implementation manners of the present application, the first direction is the height direction of the battery cell, and the first support region or the second support region is formed on the side of the electrode terminal facing the inside of the battery cell.

[0015] By forming the first support region on the side of the electrode terminal facing the inside of the battery cell, it is beneficial to improve the convenience of installing the electrode terminal and the adapter, and is also convenient for welding the electrode terminal and the adapter.

[0016] In some implementation manners of the present application, an installation groove is formed by concave inward along the first direction on the side surface of the electrode terminal facing the inside of the battery cell, and an installation boss is formed by protruding along the first direction on the side surface of the adapter corresponding to the installation groove, and the installation groove and the installation boss cooperate with each other.

[0017] By mating the installation groove with the installation boss, the mating of the installation groove and the installation boss can achieve a good positioning effect on the electrode terminal and the adapter, improve the tightness of the installation of the installation groove and the installation boss, and is beneficial to improving the reliability of the current collection assembly.

[0018] In some implementation manners of the present application, the first support region is formed on the bottom surface of the installation groove, and the second support region is formed on the top surface of the installation boss.

[0019] By forming the first support region on the bottom surface of the installation groove and the second support region on the top surface of the installation boss, the bottom surface of the installation groove and the top surface of the installation boss are fully utilized, which is beneficial to reducing the space required for arranging the installation groove, the installation boss, and the first protrusion, and is beneficial to improving the compactness of the structure.

[0020] In some implementation manners of the present application, along the direction away from the bottom surface of the installation groove, the length of the installation boss in the radial direction of the first direction gradually increases.

[0021] By making the length of the installation boss in the radial direction of the first direction gradually increase along the direction away from the bottom surface of the installation groove, it is beneficial to improve the tightness of the installation of the installation groove and the installation boss, and thus is beneficial to improving the reliability of the current collection assembly.

[0022] In some implementation manners of the present application, the adapter is in a sheet-like structure, the adapter and the electrode terminal are arranged opposite to each other in the first direction, and the adapter is bent along the first direction to form the installation boss.

[0023] By bending the adapter along the first direction to form the installation boss, it is beneficial to improve the convenience of processing and manufacturing the first protrusion.

[0024] In some implementation manners of the present application, the battery cell further includes a positive electrode top cover, and the positive electrode top cover has a top cover through hole; the electrode terminal has a clamping groove matching the top cover through hole, the clamping groove surrounds the electrode terminal for one week in the first direction, the positive electrode top cover is clamped with the electrode terminal through the cooperation of the top cover through hole and the clamping groove, and the top cover through hole is insulated and connected with the clamping groove.

[0025] By providing a clamping groove on the electrode terminal and a top cover through hole on the positive electrode top cover, a part of the electrode terminal can pass through the top cover through hole, so that the electrode terminal extends from inside the battery cell to the outside of the battery cell. And the relative positions of the positive electrode top cover and the electrode terminal can be restricted through the clamping groove, which is beneficial to improving the connection stability between the electrode terminal and the positive electrode top cover.

[0026] In some implementation manners of the present application, the battery cell further includes a cylindrical outer shell, one end of the outer shell has an opening matching the positive electrode top cover, and the positive electrode top cover is hermetically connected to the edge of the opening on the outer shell.

[0027] By setting the outer shell to a cylindrical structure, a cylindrical battery cell can be obtained, and the motor assembly can be wound into an approximate cylindrical shape and accommodated in the cylindrical outer shell, which is beneficial to improving the volume energy density of the battery cell.

[0028] In some implementation manners of the present application, the battery cell further includes a seal. The electrode terminal has a liquid injection hole penetrating along a first direction, and the seal is sealingly connected to one end of the liquid injection hole far from the adapter.

[0029] By providing a liquid injection hole on the electrode terminal, it is convenient to inject electrolyte into the battery cell through the liquid injection hole. And by sealing and fixing the seal in the liquid injection hole, the battery cell after liquid injection can be sealed, which is beneficial to improving the sealing performance of the battery cell.

[0030] In a second aspect, the present application provides a battery, which includes a housing and the battery cell provided in the first aspect of the present application. The housing forms a receiving cavity; the battery cells are disposed in the receiving cavity, and the number of the battery cells is at least two, and the at least two battery cells are connected in series, in parallel or in a hybrid connection.

[0031] The battery provided by the present application includes the battery cell provided in the first aspect of the present application, so it can achieve the same effect, that is, it can improve the reliability of the battery cell.

[0032] In a third aspect, the present application provides an electrical device, which includes an electrical body and the battery provided in the second aspect of the present application, and the battery is used to supply power to the electrical body.

[0033] The electrical device provided by the present application includes the battery provided in the second aspect of the present application, so it can achieve the same effect, that is, it can improve the reliability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0035] Figure 1 is an exploded view of the battery cell in some embodiments of the present application;

[0036] Figure 2 is a schematic structural diagram of the battery cell in a first perspective in some embodiments of the present application;

[0037] Figure 3 is Figure 2 the sectional view taken along line B-B in

[0038] Figure 4 isFigure 3 Partial enlarged view at position C;

[0039] Figure 5 Schematic structural diagram of the adapter in a first perspective in some embodiments of the present application;

[0040] Figure 6 Schematic structural diagram of the adapter in a second perspective in some embodiments of the present application;

[0041] Figure 7 is Figure 6 Cross-sectional view taken along line D-D in;

[0042] Figure 8 is Figure 7 Partial enlarged view at position F in.

[0043] Explanation of reference numerals:

[0044] 1 - Outer shell; 2 - Electrode assembly; 3 - Current collector assembly; 31 - Electrode terminal; 311 - Mounting groove; 3111 - First support area; 312 - Clamping groove; 32 - Adapter; 321 - Mounting boss; 3211 - Second support area; 32111 - First protrusion; 4 - Positive electrode top cover; 5 - Negative electrode top cover; 6 - Positive electrode aluminum nail; a - First direction. Detailed implementation manners

[0045] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0047] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", etc. are only used to distinguish objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In some embodiments of the present application, "first", "second", "third", etc. may also refer to the same object. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0049] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication of the inner regions of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0051] Next, the present application will be described in detail.

[0052] The welding of the adapter of the battery cell in the related art to the electrode terminal is not reliable enough, resulting in poor reliability of the battery cell.

[0053] Next, the reasons for the unreliable welding of the adapter to the electrode terminal are analyzed, and the analysis process is part of the creativity of the present application.

[0054] In the related art, the side surface of the electrode terminal includes a first abutting region; the adapter is used for electrically connecting with the electrode assembly; the side surface of the adapter includes a second abutting region, and the second abutting region is opposite to and supports the first abutting region along a first direction. A part of the first abutting region is welded to the corresponding part of the second abutting region. Affected by processing factors, it is not easy to control the undulation degrees of the first abutting region and the second abutting region well. For example, both the first abutting region and the second abutting region are planes. Affected by processing factors, the flatness of the first abutting region and the flatness of the second abutting region are not easily fully guaranteed. In this way, when the second abutting region supports the first abutting region, the undulations of the first abutting region and the second abutting region easily make the first abutting region and the second abutting region not fit closely enough, and the position of the part that does not fit closely enough is uncontrollable. When the part that does not fit closely enough is the part for mutual welding, that is, when the second abutting region supports the first abutting region, but there is a large gap between the parts of the first abutting region and the second abutting region for mutual welding, it is easy to reduce the welding quality and even risk of false soldering, resulting in unreliable welding between the adapter and the electrode terminal.

[0055] The present application provides a battery cell, which includes an electrode terminal and an adapter. The side surface of the electrode terminal includes a first supporting region; the adapter is used for electrically connecting with the electrode assembly; the side surface of the adapter includes a second supporting region, and the second supporting region is opposite to and supports the first supporting region along a first direction, and the contour of the first supporting region matches the contour of the second supporting region; wherein, in the first supporting region and the second supporting region, a first protrusion facing the other is formed on one of them, and the other supports the first protrusion along the first direction, and the mutually supporting regions are welded.

[0056] By making the other of the first supporting region and the second supporting region support the first protrusion along the first direction, and welding the mutually supporting regions, it is beneficial to make the parts of the electrode terminal and the adapter for mutual welding abut more closely, and the mutual abutting force applied is greater, which is beneficial to the reliability of welding, the welding strength is higher, and it is also beneficial to reduce the risk of false soldering, thereby improving the reliability of the battery cell. It can be understood that in the first supporting region and the second supporting region, a first protrusion facing the other is formed on one of them. Taking the first protrusion being formed on the first supporting region as an example, the end face of the first protrusion facing the second supporting region along the first direction, that is, the end face of the end of the first protrusion, is relatively easier to be in a position closer to the second supporting region compared with other parts of the first supporting region. In this way, it is beneficial to make the second supporting region fit closely with the first protrusion, thereby being beneficial to improving the welding quality.

[0057] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging so as to be used continuously.

[0058] The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0059] The battery cell provided by the present application is applicable to a battery. The battery includes a housing and the battery cell. Wherein, the housing is formed with a receiving cavity; the battery cell is disposed in the receiving cavity, and the number thereof is at least two, and at least two battery cells are connected in series, in parallel or in a hybrid connection. In the embodiments of the present application, the battery may be a battery module, a battery pack or an energy storage battery system, etc. Exemplarily, the energy storage battery system may be an energy storage container or an energy storage cabinet, etc.

[0060] The battery provided by the present application is applicable to an electrical device. The electrical device includes an electrical body and a battery, and the battery is used to supply power to the electrical body. For example, the electrical device may be a mobile phone, a portable device, a laptop computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spaceship, etc.

[0061] The present application will be described in detail below with reference to the accompanying drawings.

[0062] Please refer to Figures 1 to 4 , the present application provides a battery cell, which includes an electrode terminal 31 and an adapter 32. The side surface of the electrode terminal 31 includes a first support area 3111; the adapter 32 is used for electrically connecting with the electrode assembly 2; the side surface of the adapter 32 includes a second support area 3211, and the second support area 3211 and the first support area 3111 are opposite and support each other along a first direction a. The contour of the first support area 3111 matches the contour of the second support area 3211; wherein, in the first support area 3111 and the second support area 3211, a first protrusion 32111 facing the other is formed on one, and the other supports the first protrusion 32111 along the first direction a, and the mutually supporting areas are welded.

[0063] The battery cells in the embodiments of the present application may be cylindrical battery cells, prismatic battery cells, soft-pack battery cells or battery cells of other shapes. Prismatic battery cells include square shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries, etc., and there is no special limitation in the present application. In some embodiments of the present application, the battery cells are cylindrical battery cells, and the battery cells include a shell 1, an electrode assembly 2, a current collecting assembly 3, a positive electrode top cover 4, a negative electrode top cover 5 and a positive electrode aluminum nail 6. The current collecting assembly 3 includes an electrode terminal 31 and an adapter 32. The shell 1 is formed with an installation cavity, the electrode assembly 2 is arranged in the installation cavity, the adapter 32 is electrically connected to the electrode assembly 2, generally by welding, and the electrode terminal 31 is supported along the first direction a between the adapter and the side of the positive electrode top cover 4 close to the installation cavity, and a portion extends out of the installation cavity along the first direction a and is connected to the positive electrode aluminum nail 6.

[0064] The adapter 32 in the embodiment of the present application has the same meaning as that generally understood by technicians in the technical field of the present application, and is used for electrical connection between the electrode tab and the electrode terminal 31 for current collection, and generally has a sheet-like structure.

[0065] In the embodiment of the present application, it can be understood that the circumferential contour of the first protrusion 32111 is smaller than the contour of the first support area 3111 and also smaller than the contour of the second support area 3211, that is, along the first direction a, the projection of the first protrusion 32111 onto the other of the first support area 3111 and the second support area 3211 is located within the contour of the other of the first support area 3111 and the second support area 3211.

[0066] By making the other of the first supporting area 3111 and the second supporting area 3211 support each other with the first protrusion 32111 along the first direction a, and welding the mutually supporting areas, it is beneficial to make the parts of the electrode terminal 31 and the adapter 32 welded to each other more closely abut against each other, and the abutting force applied to each other is greater, which is beneficial to the reliability of welding, the welding strength is higher, and it is also beneficial to reduce the risk of cold welding, thereby improving the reliability of the current collecting assembly 3.

[0067] In some embodiments of the present application, the protrusion direction of the first protrusion 32111 may be the first direction a. In this way, the stability of the support between the other of the first supporting area 3111 and the second supporting area 3211 and the first protrusion 32111 is improved.

[0068] In some embodiments of this application, please refer to Figures 1 to 4 The first direction a is the height direction of the battery cell. The first supporting region 3111 or the second supporting region 3211 is formed on the side of the electrode terminal 31 facing the inside of the battery cell.

[0069] By forming the first support region 3111 on the side of the electrode terminal 31 facing the inside of the battery cell, it is beneficial to improve the convenience of installing the electrode terminal 31 and the adapter 32, and it is also convenient for welding the electrode terminal 31 and the adapter 32.

[0070] On this basis, in some embodiments of the present application, the first protrusion 32111 is arranged corresponding to the positive aluminum nail 6 along the first direction a. In this way, it is convenient for welding the electrode terminal 31 and the adapter 32.

[0071] In some embodiments of the present application, the contour of the mutually supporting region matches the contour of the end face of the first protrusion 32111.

[0072] By making the contour of the mutually supporting region match the contour of the end face of the first protrusion 32111, it is beneficial to improve the welding reliability between the adapter 32 and the electrode terminal 31.

[0073] In some embodiments of the present application, please refer to Figures 1 to 4 , in the first support region 3111 and the second support region 3211, one of the regions that supports the first protrusion 32111 is a plane and is perpendicular to the first direction a; or, in the first support region 3111 and the second support region 3211, one of the regions that supports the first protrusion 32111 forms a second protrusion towards the first protrusion 32111 and supports the first protrusion 32111 through the second protrusion; or, in the first support region 3111 and the second support region 3211, one of the regions that supports the first protrusion 32111 forms a concave portion corresponding to the first protrusion 32111, the depth of the concave portion is less than the height of the first protrusion 32111, and in the first support region 3111 and the second support region 3211, one of the regions that supports the first protrusion 32111 supports the first protrusion 32111 through the bottom surface of the concave portion.

[0074] By making the other of the first support region 3111 and the second support region 3211 a plane, the manufacturing of the other is relatively convenient, and the other can abut against the first protrusion 32111 more closely, which is beneficial to the welding reliability. By making the other form a second protrusion corresponding to the first protrusion 32111 and the other supports the first protrusion 32111 through the second protrusion, it is beneficial to further improve the tightness of the abutment of the mutually welded parts of the electrode terminal 31 and the adapter 32, thereby further improving the welding reliability. By making the other support the first protrusion 32111 through the bottom surface of the concave portion, the cooperation between the concave portion and the first protrusion 32111 can achieve a good positioning effect on the welding area of the electrode terminal 31 and the adapter 32, and it is also beneficial to improve the assembly tightness, thereby being beneficial to improving the welding reliability.

[0075] In some embodiments of the present application, please refer to Figures 5 to 8, the first protrusion 32111 has an annular structure, the axial direction of the annular structure is the first direction a, and the extension path of the welding area between the electrode terminal 31 and the adapter 32 matches the extension path of the annular structure.

[0076] By making the extension path of the welding area between the electrode terminal 31 and the adapter 32 match the extension path of the annular structure, the extension length of the welding area between the electrode terminal 31 and the adapter 32 is larger and forms a closed ring, which is beneficial to improving the welding reliability.

[0077] In some embodiments of the present application, please refer to Figures 5 to 8 , the adapter 32 has a sheet-like structure, the adapter 32 and the electrode terminal 31 are arranged opposite to each other along the first direction a, and the adapter 32 is bent along the first direction a to form the first protrusion 32111.

[0078] In the embodiment of the present application, the second support area 3211 is formed on the end face of one end of the adapter 32 close to the electrode terminal 31 in the thickness direction.

[0079] By bending the adapter 32 along the first direction a to form the first protrusion 32111, it is beneficial to improve the convenience of processing and manufacturing the first protrusion 32111, and it is beneficial to make the first protrusion 32111 have greater flexibility, so that it is convenient to be compressed by the second one in the first support area 3111 and the second support area 3211 along the first direction a, so that the first support area 3111 and the second support area 3211 are more closely attached together, which is beneficial to the tightness of the assembly of the electrode terminal 31 and the adapter 32.

[0080] In some embodiments of the present application, please refer to Figures 5 to 8 , along the extension direction of the adapter 32, the first protrusion 32111 is formed in the middle of the adapter 32. In this way, it is beneficial to improve the reliability of the first protrusion 32111.

[0081] In some embodiments of the present application, please refer to Figures 5 to 8 , a mounting groove 311 is formed by concave inward along the first direction a on the side surface of the electrode terminal 31 facing the inside of the battery cell, and a mounting boss 321 is formed by protruding along the first direction a on the side surface of the adapter 32 corresponding to the mounting groove 311, and the mounting groove 311 cooperates with the mounting boss 321.

[0082] By making the mounting groove 311 cooperate with the mounting boss 321, the cooperation between the mounting groove 311 and the mounting boss 321 can play a good positioning effect on the electrode terminal 31 and the adapter 32, and can improve the tightness of the installation of the mounting groove 311 and the mounting boss 321, which is beneficial to improving the reliability of the current collecting component 3.

[0083] In some embodiments of the present application, please refer to Figures 5 to 8, the first support area 3111 is formed on the bottom surface of the installation groove 311, and the second support area 3211 is formed on the top surface of the installation boss 321.

[0084] In the embodiment of the present application, the top surface of the installation boss 321 is the end face of the installation boss 321 along the first direction a.

[0085] By forming the first support area 3111 on the bottom surface of the installation groove 311 and the second support area 3211 on the top surface of the installation boss 321, the bottom surface of the installation groove 311 and the top surface of the installation boss 321 are fully utilized, which is beneficial to reducing the space required for arranging the installation groove 311, the installation boss 321 and the first protrusion 32111, and is beneficial to improving the compactness of the structure.

[0086] In some embodiments of the present application, please refer to Figures 5 to 8 , along the direction away from the bottom surface of the installation groove 311, the length of the installation boss 321 in the radial direction of the first direction a gradually increases.

[0087] By making the length of the installation boss 321 in the radial direction of the first direction a gradually increase along the direction away from the bottom surface of the installation groove 311, it is beneficial to improve the tightness of the installation of the installation groove 311 and the installation boss 321, and thus beneficial to improving the reliability of the current collecting component 3.

[0088] In some embodiments of the present application, please refer to Figures 5 to 8 , the installation boss 321 is a frustum-shaped structure, and the axial direction of the frustum-shaped structure is the first direction a. In this way, the processing and manufacturing of the installation boss 321 are relatively convenient, and it is beneficial to make the cooperation between the installation boss 321 and the installation groove 311 relatively tight. Of course, in some other embodiments of the present application, the installation boss 321 may also be a cylindrical or prismatic structure, etc.

[0089] In some embodiments of the present application, please refer to Figures 5 to 8 , the adapter 32 is in a sheet-like structure, the thickness direction of the adapter 32 is the first direction a, and the adapter 32 is bent along the first direction a to form the installation boss 321.

[0090] By bending the adapter 32 along the first direction a to form the installation boss 321, it is beneficial to improve the convenience of processing and manufacturing the first protrusion 32111.

[0091] In some embodiments of the present application, please refer to Figures 5 to 8, the adapter 32 has a sheet-like structure. The adapter 32 and the electrode terminal 31 are oppositely arranged along the first direction a. The adapter 32 is bent along the first direction a to form a mounting boss 321. On the side of the electrode terminal 31 close to the adapter 32, a mounting groove 311 is formed by being concave inward along the first direction a. The mounting groove 311 cooperates with the mounting boss 321. Along the direction away from the bottom surface of the mounting groove 311, the length of the mounting boss 321 in the radial direction of the first direction a gradually increases. The adapter 32 is bent along the first direction a to form a first protrusion 32111. The first support area 3111 is formed on the bottom surface of the mounting groove 311, and the second support area 3211 is formed on the top surface of the mounting boss 321. The first support area 3111 is a plane and is perpendicular to the first direction a. The first protrusion 32111 has an annular structure, the axial direction of the annular structure is the first direction a, and the extension path of the welding area between the electrode terminal 31 and the adapter 32 matches the extension path of the annular structure. In this way, the parts where the electrode terminal 31 and the adapter 32 are welded to each other are abutted more closely, the abutting force applied to each other is greater, which is beneficial to the reliability of welding, the welding strength is higher, and it is also beneficial to reduce the risk of false soldering, thereby improving the reliability of the battery cell.

[0092] In some embodiments of the present application, please refer to Figure 4 , the battery cell further includes a positive electrode top cover 4, and the positive electrode top cover 4 has a top cover through hole; the electrode terminal 31 has a clamping groove 312 that matches the top cover through hole. The clamping groove 312 surrounds the electrode terminal 31 once along the first direction a. The positive electrode top cover 4 is clamped with the electrode terminal 31 through the cooperation of the top cover through hole and the clamping groove 312, and the top cover through hole and the clamping groove 312 are insulated and connected.

[0093] In the embodiments of the present application, the electrode assembly 2 in the battery cell needs a closed accommodation environment. A positive electrode top cover 4 can be provided in the battery cell, and a closed accommodation environment for accommodating the electrode assembly 2 is formed through the cooperation of the positive electrode top cover 4 and the housing 1.

[0094] As Figure 4 shown, after the electrode terminal 31 is connected to the electrode assembly 2 through the adapter 32, it needs to extend to the outside of the housing 1. A top cover through hole can be provided on the positive electrode top cover 4 to facilitate the electrode terminal 31 to pass through the top cover through hole and extend to the outside of the housing 1. And a clamping groove 312 that matches the top cover through hole can be provided on the electrode terminal 31. For example, the electrode terminal 31 can be set as a cylinder, and the clamping groove 312 can be provided on the circumferential side surface of the cylindrical electrode terminal 31. The clamping groove 312 surrounds the electrode terminal 31 once, and the axial direction of the clamping groove 312 is parallel or nearly parallel to the first direction a. In this way, during the process of assembling the positive electrode top cover 4 and the electrode terminal 31, the electrode terminal 31 can be passed through the top cover through hole on the positive electrode top cover 4, and the edge of the top cover through hole on the positive electrode top cover 4 can be clamped in the clamping groove 312.

[0095] In addition, an insulating member can be provided between the top cover through-hole and the clamping groove 312. For example, the insulating member can be made of materials such as polyimide to isolate the current between the electrode terminal 31 and the positive top cover 4 through the insulating member.

[0096] By providing the clamping groove 312 on the electrode terminal 31 and the top cover through-hole on the positive top cover 4, a part of the electrode terminal 31 can pass through the top cover through-hole, so that the electrode terminal 31 extends from inside the battery cell to outside the battery cell. And the relative positions of the positive top cover 4 and the electrode terminal 31 can be restricted through the clamping groove 312, which is beneficial to improving the connection stability between the electrode terminal 31 and the positive top cover 4.

[0097] In some embodiments of the present application, please refer to Figure 1 , the battery cell further includes a cylindrical outer shell 1. One end of the outer shell 1 has an opening matching the positive top cover 4, and the positive top cover 4 is hermetically connected to the edge of the opening on the outer shell 1.

[0098] In the embodiments of the present application, the battery cell can be a cylindrical battery. Then, the outer shell 1 can be set as a cylindrical structure, and an opening matching the positive top cover 4 is provided at one end of the cylindrical outer shell 1. In this way, after installing the electrode assembly 2 and the like in the installation cavity of the outer shell 1, the edge of the positive top cover 4 and the edge of the opening on the outer shell 1 can be hermetically connected by welding or the like to hermetically install the battery assembly in the battery cell.

[0099] By setting the outer shell 1 as a cylindrical structure, a cylindrical battery cell can be obtained, and the motor assembly can be wound into an approximate cylindrical shape and accommodated in the cylindrical outer shell 1, which is beneficial to improving the volume energy density of the battery cell.

[0100] In some embodiments of the present application, please refer to Figure 1 and Figure 4 , the battery cell further includes a sealing member. The electrode terminal 31 has a liquid injection hole penetrating along the first direction a, and the sealing member is hermetically connected to one end of the liquid injection hole far from the adapter 32.

[0101] In the embodiments of the present application, the electrode assembly 2 forms a current in the electrolyte to supply electrical energy externally. After completing the assembly of the battery cell, it is necessary to inject electrolyte into the battery cell. Then, a liquid injection hole can be provided on the electrode terminal 31. For example, a liquid injection hole penetrating the electrode terminal 31 along the first direction a is provided on the cylindrical electrode terminal 31, and the liquid injection hole can be a frustum-shaped through-hole. After completing the liquid injection of the battery cell, it is necessary to seal the liquid injection hole, as Figure 4As shown, a seal can be provided on the liquid injection hole to seal the end of the liquid injection hole away from the adapter 32, that is, to seal the part of the electrode terminal 31 located outside the battery cell. For example, the seal can be made of materials such as aluminum or alloy. The seal is set to a structure matching the liquid injection hole, and the seal can be hermetically fixed in the liquid injection hole by means such as welding.

[0102] By providing a liquid injection hole on the electrode terminal 31, it is convenient to inject electrolyte into the battery cell through the liquid injection hole. And by hermetically fixing the seal in the liquid injection hole, the battery cell after liquid injection can be sealed, which is beneficial to improving the sealing performance of the battery cell.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that: include: An electrode terminal, wherein a side surface of the electrode terminal includes a first supporting area; A transition piece, used for electrically connecting to the electrode assembly; The side surface of the adapter includes a second supporting area, the second supporting area and the first supporting area are opposite to each other along a first direction and support each other, and the contour of the first supporting area matches the contour of the second supporting area; Among them, one of the first supporting area and the second supporting area is formed with a first protrusion facing the other, and the other supports the first protrusion along the first direction, and the mutually supporting areas are welded.

2. The battery cell according to claim 1, characterized in that: The contour of the mutually supporting region matches the contour of the end surface of the distal end of the first protrusion.

3. The battery cell according to claim 1, characterized in that: In the first supporting region and the second supporting region, A plane supported by the first protrusion and perpendicular to the first direction; Or, a second protrusion is formed toward the first protrusion and supported by the first protrusion, and supported by the first protrusion through the second protrusion; Alternatively, a concave portion is formed on one of the first protrusions corresponding to the one supported by the first protrusion, the depth of the concave portion is smaller than the height of the first protrusion, and the one supported by the first protrusion is supported by the first protrusion through the bottom surface of the concave portion.

4. The battery cell according to claim 1, characterized in that: The adapter is in a sheet-like structure. The adapter and the electrode terminal are arranged opposite to each other along the first direction. The adapter is bent along the first direction to form the first protrusion.

5. The battery cell according to claim 1, characterized in that: The first protrusion is in an annular structure, the axial direction of the annular structure is the first direction, and the extension path of the welding area between the electrode terminal and the adapter matches the extension path of the annular structure.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The first direction is a height direction of the battery cell, and the first supporting region or the second supporting region is formed on a side of the electrode terminal facing the inside of the battery cell.

7. The battery cell according to claim 6, characterized in that: The side surface of the electrode terminal facing the battery cell is concavely formed with a mounting groove along the first direction, and the side surface of the adapter is convexly formed with a mounting boss along the first direction corresponding to the mounting groove, and the mounting groove cooperates with the mounting boss.

8. The battery cell according to claim 7, characterized in that: The first supporting area is formed on the bottom surface of the mounting groove, and the second supporting area is formed on the top surface of the mounting boss.

9. The battery cell according to claim 7, characterized in that: Along the direction away from the bottom surface of the mounting groove, the length of the mounting boss in the radial direction of the first direction gradually increases.

10. The battery cell according to claim 7, characterized in that: The adapter is bent along the first direction to form the mounting boss.

11. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell also includes a positive top cover, which has a top cover through hole; the electrode terminal has a snap-in groove matching the top cover through hole, and the snap-in groove surrounds the electrode terminal around the first direction. The positive top cover is snap-fitted to the electrode terminal through the cooperation of the top cover through hole and the snap-in groove, and the top cover through hole is insulated and connected to the snap-in groove.

12. The battery cell according to claim 11, characterized in that: The battery cell further comprises a cylindrical outer shell, one end of which has an opening matching the positive electrode top cover, and the positive electrode top cover is sealed and connected to the edge of the opening on the outer shell.

13. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell further includes a sealing member. The electrode terminal has a liquid injection hole penetrating along the first direction. The sealing member is sealed and connected to an end of the liquid injection hole away from the adapter.

14. A battery, characterized in that: include: A housing, wherein the housing is formed with a receiving cavity; The battery monomer according to any one of claims 1 to 13, wherein the battery monomer is arranged in the accommodating cavity, and the number is at least two, and at least two of the battery monomers are connected in series, in parallel or in mixed connection.

15. An electrical equipment, characterized in that: include: Electricity-consuming entity; The battery as claimed in claim 14 is used to supply power to the power-consuming entity.

Images