Battery and electric equipment

Abstract

The utility model provides a battery and electric equipment. The battery comprises a shell, an electrode assembly and a tab connecting piece, a mounting cavity is formed in the shell, an inwards-shrinking part is formed in the shell, the inwards-shrinking part protrudes towards the interior of the mounting cavity, the electrode assembly is mounted in the mounting cavity, the tab connecting piece is arranged on one side of the inwards-shrinking part, an avoiding space is formed in the side, facing the inwards-shrinking part, of the tab connecting piece, and the avoiding space is used for containing the inwards-shrinking part; and the inner shrinkage part and the tab connecting piece are arranged at an interval. According to the battery disclosed by the invention, the contact position of the tab connecting piece and the shell can be prevented from being corroded due to direct contact between the tab connecting piece and the shell, so that the corrosion probability of the battery is reduced, and the stability of the battery is improved.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No.

[0003] 202423033318.8, filed on December 09, 2024, with the Chinese Patent Office, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0004] The present application relates to the technical field of batteries, in particular to a battery and an electric device. BACKGROUND

[0005] Batteries are widely used in energy storage systems, vehicles, consumer electronics and other fields. The shell and the tab of the battery need to be connected together through a connecting structure.

[0006] In the related art, the battery is prone to corrosion. UTILITY MODEL CONTENT

[0007] Embodiments of the present application provide a battery and an electric device, which can improve the technical problem that the battery is prone to corrosion.

[0008] In a first aspect, embodiments of the present application provide a battery, comprising:

[0009] a shell, which forms a mounting cavity, the shell forms a retracted portion, the retracted portion protrudes into the mounting cavity;

[0010] an electrode assembly, which is installed in the mounting cavity;

[0011] a tab connector, which is arranged on one side of the retracted portion, the tab connector is provided with a avoiding space on the side of the retracted portion, the avoiding space is used to accommodate the retracted portion, so that the retracted portion and the tab connector are arranged in a spaced manner.

[0012] In an embodiment, the avoiding space includes an avoiding groove formed in the tab connector, and the avoiding groove is used to accommodate the retracted portion.

[0013] In an embodiment, the retracted portion and the wall surface of the avoiding groove are arranged in a spaced manner.

[0014] In an embodiment, the battery includes an insulating sheet, which is arranged on the wall surface of the avoiding groove to insulate and separate the retracted portion and the wall surface of the avoiding groove.

[0015] In an embodiment, the groove depth of the avoiding groove gradually increases along the direction from the side wall of the shell to the center of the shell.

[0016] In an embodiment, the groove has a groove depth F9, F9≥0.05mm.

[0017] In an embodiment, the groove has a length F8 along the radial direction of the shell, F8≥1mm.

[0018] In an embodiment, the battery further comprises an insulation member connected to a side of the tab connecting member facing the inner recess.

[0019] In an embodiment, the battery further comprises an electrode connecting member connected to the tab connecting member, the electrode connecting member being configured to be connected to the inner recess and the tab connecting member being configured to be connected to a tab.

[0020] In an embodiment, the electrode assembly is located between the inner recess and an inner bottom wall of the shell, wherein,

[0021] At least part of the electrode connecting member is located between the inner recess and the electrode assembly; and / or,

[0022] At least part of the electrode connecting member is located on a side of the inner recess facing away from the electrode assembly.

[0023] In an embodiment, the length of the avoidance space along the radial length of the shell is greater than the length of the inner recess.

[0024] In an embodiment, the length of the avoidance space along the radial direction of the shell is F1, F1=1mm-(B-0.7A), where A is the diameter of the electrode assembly and B is the inner diameter of the shell.

[0025] In an embodiment, the battery further comprises a packaging portion provided on a side of the tab connecting member facing the inner recess, the packaging portion being in abutment with the inner recess.

[0026] In an embodiment, the packaging portion extends to the opening of the avoidance groove.

[0027] In an embodiment, the height of the packaging portion protruding from the tab connecting member along the axial direction of the shell is F10, F10≥0.2mm.

[0028] In a second aspect, embodiments of the present application provide a use electric device comprising the battery described above.

[0029] The beneficial effects of embodiments of the present application are as follows:

[0030] In the embodiment of the present application, by forming a avoiding space on the side of the tab connector towards the inwardly recessed part, when the battery is formed, that is, the inwardly recessed part protrudes into the mounting cavity, the avoiding space can be used to accommodate the inwardly recessed part, so that the inwardly recessed part is arranged in a spaced manner with the tab connector, avoiding the inwardly recessed part from contacting the tab connector, that is, the inwardly recessed part and the tab connector do not directly contact, thereby avoiding the tab connector from directly contacting the shell to cause corrosion at the contact position of the tab connector and the shell, reducing the probability of corrosion of the battery and improving the stability of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0032] Figure 1 is one of the structural schematic diagrams of the tab connector provided by the embodiment of the present application;

[0033] Figure 2 is the second structural schematic diagram of the tab connector provided by the embodiment of the present application;

[0034] Figure 3 is the structural schematic diagram of the tab connector provided by the embodiment of the present application, which is provided with an insulating sheet;

[0035] Figure 4 is the structural schematic diagram of the tab connector provided by the embodiment of the present application; Figure 3 is an enlarged schematic diagram of the structure at A in FIG. 8;

[0036] Figure 5 is the structural schematic diagram of the battery provided by the embodiment of the present application;

[0037] Figure 6 is the partial structural schematic diagram of the battery provided by the embodiment of the present application. DETAILED DESCRIPTION

[0038] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawing; and "inner" and "outer" refer to the contour of the device.

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawing; and "inner" and "outer" refer to the contour of the device. Figures 1 to 6 The battery and the electric device of the present application are described below.

[0040] According to the embodiments of the first aspect of the present application, referring to Figure 1 、 Figure 5 and Figure 6 , the battery comprises a shell 1, an electrode assembly and a tab connecting piece 23, the shell 1 is formed with a mounting cavity 11, the shell 1 is formed with a retracted portion 12, the retracted portion 12 protrudes into the mounting cavity 11, the electrode assembly is installed in the mounting cavity 11, the tab connecting piece 23 is arranged on one side of the retracted portion 12, the tab connecting piece 23 is provided with a avoiding space 235 on the side facing the retracted portion 12, the avoiding space 235 is used to accommodate the retracted portion 12, so that the retracted portion 12 is arranged in a spaced manner with the tab connecting piece 23.

[0041] According to the battery of the embodiments of the present application, by forming the avoiding space 235 on the side of the tab connecting piece 23 facing the retracted portion 12, when the battery is formed, that is, the retracted portion 12 protrudes into the mounting cavity 11, the avoiding space 235 can be used to accommodate the retracted portion 12, so that the retracted portion 12 is arranged in a spaced manner with the tab connecting piece 23, avoiding the retracted portion 12 from contacting the tab connecting piece 23, that is, the retracted portion 12 and the tab connecting piece 23 do not directly contact each other, thereby avoiding the corrosion of the contact position between the tab connecting piece 23 and the shell 1 caused by the direct contact between the tab connecting piece 23 and the shell 1, reducing the probability of corrosion of the battery, and improving the stability of the battery.

[0042] In some embodiments, referring to Figure 2 、 Figure 5 and Figure 6 , the avoiding space 235 comprises an avoiding groove 236 formed in the tab connecting piece 23, and the avoiding groove 236 is used to accommodate the retracted portion 12.

[0043] It can be understood that when the inner recess 12 protrudes into the mounting cavity 11, the avoidance groove 236 can be used to accommodate the inner recess 12, so that the inner recess 12 is spaced apart from the tab connector 23, avoiding the inner recess 12 from contacting the tab connector 23, which can avoid the tab connector 23 from directly contacting the shell 1 to cause corrosion at the contact position of the tab connector 23 and the shell 1, thereby reducing the probability of corrosion of the battery and improving the stability of the battery.

[0044] In some embodiments, the inner recess 12 is spaced apart from the wall surface of the avoidance groove 236 to prevent the inner recess 12 from contacting the tab connector 23, and at the same time, it is convenient to arrange a separation structure (such as the packaging portion 3, an insulating structure, etc.) between the inner recess 12 and the wall surface of the avoidance groove 236 to fully ensure that the inner recess 12 and the wall surface of the avoidance groove 236 do not directly contact.

[0045] In some embodiments, referring to Figure 3 and Figure 4 , the battery comprises an insulating sheet 80 arranged on the wall surface of the avoidance groove 236 to insulate and separate the inner recess 12 and the wall surface of the avoidance groove 236.

[0046] It can be understood that the insulating sheet 80 can insulate and separate the inner recess 12 and the wall surface of the avoidance groove 236 to prevent the inner recess 12 from directly contacting the wall surface of the avoidance groove 236, which can avoid the corrosion caused by the contact between the inner recess 12 and the wall surface of the avoidance groove 236.

[0047] In some embodiments, the groove depth of the avoidance groove 236 gradually increases along the direction from the side wall of the shell 1 to the center of the shell 1.

[0048] It can be understood that when the battery is formed, the inner recess 12 will protrude into the mounting cavity 11, and the inner recess 12 will gradually incline downward along the direction from the side wall of the shell 1 to the center of the shell 1. Therefore, the groove depth of the avoidance groove 236 is designed to gradually increase along the direction from the side wall of the shell 1 to the center of the shell 1, so that the avoidance groove 236 can better accommodate the inner recess 12.

[0049] In some embodiments, the groove depth of the avoidance groove 236 is F9, and F9≥0.05mm.

[0050] It can be understood that if the groove depth of the avoidance groove 236 is less than 0.05mm, the avoidance groove 236 will be difficult to accommodate the inner recess 12, and the inner recess 12 may directly contact the tab connector 23. Therefore, the groove depth of the avoidance groove 236 is set to be greater than or equal to 0.05mm.

[0051] In some embodiments, along the radial direction of the shell 1, the length of the avoidance groove 236 is F8, and F8≥1mm.

[0052] It can be understood that if the length of the avoiding groove 236 is less than 0.1 mm, the avoiding groove 236 is difficult to accommodate the inner recess 12, and the inner recess 12 can directly contact the tab connector 23, so the length of the avoiding groove 236 is greater than or equal to 0.1 mm in the application.

[0053] In some embodiments, referring to Figure 5 and Figure 6 , the battery further comprises an electrode connector 22, the tab connector 23 is connected with the electrode connector 22, the electrode connector 22 is used to connect with the inner recess 12, and the tab connector 23 is used to connect with the tab.

[0054] It can be understood that the inner recess 12, the electrode connector 22, the tab connector 23 and the tab are connected in sequence, so that the inner recess 12 of the shell 1 and the tab are connected by using the electrode connector 22 and the tab connector 23.

[0055] Since the tab connector 23 is formed with the avoiding space 235, the inner recess 12 does not directly contact the tab connector 23, thereby reducing the contact points between the connector 2 (including the electrode connector 22 and the tab connector 23) and the inner recess 12, and thereby effectively delaying the corrosion speed of the connector 2 and the shell 1.

[0056] In some embodiments, along the radial length of the shell 1, the length of the avoiding space 235 is greater than the length of the inner recess 12, so that the avoiding space 235 can effectively accommodate the inner recess 12, thereby avoiding the contact between the inner recess 12 and the tab connector 23.

[0057] In some embodiments, the electrode assembly is located between the inner recess 12 and the inner bottom wall 13 of the shell 1.

[0058] Specifically, at least part of the electrode connector 22 is located between the inner recess 12 and the electrode assembly, facilitating the connection between the electrode connector 22 and the inner recess 12.

[0059] Specifically, at least part of the electrode connector 22 is located on the side of the inner recess 12 away from the electrode assembly, so that the inner recess 12 can support the electrode connector 22 while the electrode connector 22 and the inner recess 12 are connected, thereby improving the installation stability of the connector 2.

[0060] In some embodiments, A is the diameter of the electrode assembly, B is the inner diameter of the shell 1, the length of the avoiding space 235 is F1 along the radial direction of the shell 1, F1 = 1 mm - (B - 0.7A), thereby ensuring that the length of the avoiding space 235 is sufficient to accommodate the inner recess 12, and avoiding the direct contact between the inner recess 12 and the tab connector 23.

[0061] In some embodiments, referring toFigure 1 、 Figure 2 and Figure 4 The battery further comprises a packaging portion 3, which is arranged on the side of the tab connector 23 facing the inwardly-recessed portion 12, and abuts against the inwardly-recessed portion 12.

[0062] It can be understood that when the packaging portion 3 is located between the tab connector 23 and the inwardly-recessed portion 12, the packaging portion 3 can separate the tab connector 23 and the inwardly-recessed portion 12.

[0063] When the packaging portion 3 abuts against the avoiding space 235, once the inwardly-recessed portion 12 contacts the tab connector 23, the packaging portion 3 can protect the connection between the inwardly-recessed portion 12 and the tab connector 23, so as to avoid impurities entering the connection between the inwardly-recessed portion 12 and the tab connector 23, thereby preventing corrosion of the connection between the inwardly-recessed portion 12 and the tab connector 23.

[0064] In some embodiments, referring to Figure 1 、 Figure 2 and Figure 4 The packaging portion 3 extends to the slot opening of the avoiding slot 236.

[0065] It can be understood that when the avoiding slot 236 cannot accommodate the inwardly-recessed portion 12, the packaging portion 3 will be located between the inwardly-recessed portion 12 and the tab connector 23, and can separate the inwardly-recessed portion 12 and the tab connector 23, so as to avoid direct contact between the inwardly-recessed portion 12 and the tab connector 23.

[0066] When the size of the inwardly-recessed portion 12 is just the same as the size of the avoiding slot 236, that is, the inwardly-recessed portion 12 contacts the side wall of the avoiding slot 236, since the packaging portion 3 extends to the slot opening of the avoiding slot 236, the packaging portion 3 abuts against the inwardly-recessed portion 12, and the packaging portion 3 can protect the connection between the inwardly-recessed portion 12 and the wall surface of the avoiding slot 236, so as to avoid impurities (such as electrolyte) entering the connection between the inwardly-recessed portion 12 and the wall surface of the avoiding slot 236, thereby preventing corrosion of the connection between the inwardly-recessed portion 12 and the wall surface of the avoiding slot 236.

[0067] Specifically, along the axial direction of the shell 1, the height of the packaging portion 3 protruding from the tab connector 23 is F10, and F10≥0.2mm.

[0068] It can be understood that the protruding height of the packaging portion 3 is greater than or equal to 0.2mm, so that the packaging portion 3 can effectively separate the inwardly-recessed portion 12 and the tab connector 23.

[0069] It can be understood that when the inner recess 12 and the tab connector 23 are in contact, the packaging part 3 with a protruding height greater than or equal to 0.2 mm can effectively protect the connection between the inner recess 12 and the tab connector 23, so as to avoid the connection between the inner recess 12 and the tab connector 23 from entering impurities.

[0070] In some embodiments, the battery comprises the connector 2 and the packaging part 3, the connector 2 has the electrode connector 22 and the tab connector 23, the electrode connector 22 is used to connect the electrode of the battery, and the tab connector 23 is used to connect the tab of the battery.

[0071] At least part of the structure of the packaging part 3 is arranged at the connection between the electrode connector 22 and the tab connector 23, and / or at least part of the structure of the packaging part 3 is arranged at the connection between the electrode connector 22 and the electrode of the battery.

[0072] According to the battery of the embodiments of the present application, by arranging the packaging part 3 at the connection between the electrode connector 22 and the tab connector 23, the packaging part 3 can prevent impurities from entering the connection between the electrode connector 22 and the tab connector 23, avoid the impurities from affecting the connection strength of the electrode connector 22 and the tab connector 23, improve the connection stability of the electrode connector 22 and the tab connector 23, improve the structural stability of the connector 2, and further improve the connection stability between the tab of the battery and the electrode of the battery. By arranging the packaging part 3 at the connection between the electrode connector 22 and the electrode, the packaging part 3 can prevent impurities from entering the connection between the electrode connector 22 and the electrode, avoid the impurities from affecting the connection strength of the electrode connector 22 and the electrode, improve the connection stability of the electrode connector 22 and the electrode, and further improve the connection stability between the tab of the battery and the electrode of the battery.

[0073] In some embodiments, the electrode of the battery comprises a battery shell or a battery pole.

[0074] It can be understood that when the electrode of the battery is the battery shell, the electrode connector 22 is connected with the battery shell, that is, the connector 2 connects the battery shell and the tab of the battery. When the electrode of the battery is the battery pole, the electrode connector 22 is connected with the battery pole, that is, the connector 2 connects the battery pole and the tab of the battery.

[0075] In some examples, the impurities are, for example, electrolyte.

[0076] In some examples, the packaging part 3 is arranged at least at part of the connector 2, which can be arranged at the bending part of the connector 2, or the entire connector 2, or the end part where the connector 2 is connected with the shell 1.

[0077] In some examples, at least part of the encapsulation part 3 is arranged at the connection between the connecting member 2 and the shell 1. This means that part of the encapsulation part 3 is arranged at the connection between the connecting member 2 and the shell 1, and another part of the encapsulation part 3 is arranged at another position of the connecting member 2.

[0078] In some examples, at least part of the encapsulation part 3 is arranged at the connection between the connecting member 2 and the shell 1. This means that part of the encapsulation part 3 is arranged at the connection between the connecting member 2 and the shell 1, and another part of the encapsulation part 3 is arranged at another position of the connecting member 2.

[0079] In some examples, the encapsulation part 3 is, for example, encapsulation glue. The material of the encapsulation glue can be polyurethane type, epoxy type, anaerobic glue, UV glue, acrylic type, hot melt glue, etc. The elastic modulus of the encapsulation glue is between 0.1 Gpa and 6 Gpa.

[0080] Specifically, the encapsulation part 3 is arranged at the connection between the electrode connecting member 22 and the electrode of the battery.

[0081] It can be understood that, by arranging the encapsulation part 3 at the connection between the electrode connecting member 22 and the electrode of the battery, the encapsulation part 3 can prevent the connection between the electrode connecting member 22 and the electrode of the battery from contacting other substances, avoid the connection strength between the electrode connecting member 22 and the electrode of the battery being affected by other substances, ensure the connection strength between the electrode connecting member 22 and the electrode, improve the stability of the connection between the electrode connecting member 22 and the electrode, and thus enable the connecting member 2 to stably connect the electrode and the tab, thereby improving the stability of the connection between the electrode and the tab.

[0082] Specifically, the encapsulation part 3 is arranged at the connection between the electrode connecting member 22 and the tab connecting member 23.

[0083] It can be understood that, by arranging the encapsulation part 3 at the connection between the electrode connecting member 22 and the tab connecting member 23, the encapsulation part 3 can prevent the connection between the electrode connecting member 22 and the tab connecting member 23 from contacting other substances, avoid the connection strength between the electrode connecting member 22 and the tab connecting member 23 being affected by other substances, ensure the connection strength between the electrode connecting member 22 and the tab connecting member 23, improve the structural stability of the connecting member 2, and thus enable the connecting member 2 to stably connect the electrode and the tab of the battery, thereby improving the stability of the connection between the electrode and the tab of the battery.

[0084] Specifically, the electrode connecting member 22 and the tab connecting member 23 are in contact with the encapsulation part 3 at the same time.

[0085] It can be understood that at the connection position of the electrode connecting piece 22 and the tab connecting piece 23, one part of the packaging portion 3 is in contact with the electrode connecting piece 22, and another part of the packaging portion 3 is in contact with the tab connecting piece 23, so that the packaging portion 3 can effectively package the connection position of the electrode connecting piece 22 and the tab connecting piece 23, effectively prevent impurities from entering the connection position of the electrode connecting piece 22 and the tab connecting piece 23, and improve the connection stability of the electrode connecting piece 22 and the tab connecting piece 23.

[0086] For example, the packaging portion 3 has at least two connecting surfaces, one of which is in contact with the electrode connecting piece 22 at the connection position of the electrode connecting piece 22 and the tab connecting piece 23, and the other is in contact with the tab connecting piece 23.

[0087] Specifically, the electrode connecting piece 22 and the electrode of the battery are in contact with the packaging portion 3 at the same time.

[0088] It can be understood that at the connection position of the electrode connecting piece 22 and the electrode of the battery, one part of the packaging portion 3 is in contact with the electrode connecting piece 22, and another part of the packaging portion 3 is in contact with the electrode, so that the packaging portion 3 can effectively package the connection position of the electrode connecting piece 22 and the electrode, effectively prevent impurities from entering the connection position of the electrode connecting piece 22 and the electrode, and improve the connection stability of the electrode connecting piece 22 and the electrode.

[0089] For example, the packaging portion 3 has at least two connecting surfaces, one of which is in contact with the electrode connecting piece 22 at the connection position of the electrode connecting piece 22 and the electrode, and the other is in contact with the electrode.

[0090] In some embodiments, the battery includes a shell 1, and the packaging portion 3 is arranged at the connection position of the electrode connecting piece 22 and the shell 1.

[0091] It can be understood that the packaging portion 3 can prevent impurities from entering the connection position of the electrode connecting piece 22 and the shell 1, and avoid affecting the connection strength of the electrode connecting piece 22 and the shell 1.

[0092] Specifically, the packaging portion extends to the side wall surface of the shell and abuts against the side wall surface of the shell, so that the packaging portion can effectively package the connection position of the electrode connecting piece 22 and the shell 1, and prevent impurities from entering the connection position of the electrode connecting piece 22 and the shell 1.

[0093] In some embodiments, the tab connecting piece 23 is arranged in a spaced manner with the shell 1.

[0094] It can be understood that the tab connecting piece 23 is spaced apart from the shell 1, and the tab connecting piece 23 does not directly contact the shell 1, thereby reducing the connection points of the connecting piece 2 and the shell 1, and avoiding corrosion and other problems caused by the contact between the tab connecting piece 23 and the shell 1.

[0095] In some examples, the electrode connecting piece 22 is connected with the tab connecting piece 23 by surface chemical treatment, for example, electroplating, electroless plating, spraying, and the like. The electrode connecting piece 22 can also be connected with the tab connecting piece 23 by surface physical treatment, for example, composite metal stamping, and the like.

[0096] In some examples, the tab connecting piece 23 and the electrode connecting piece 22 can be connected together by welding, cold heading, thermal bonding, jointing, riveting, heat shrink tube, and the like. The electrode connecting piece 22 and the shell 1 can be connected by laser welding, spot welding, resistance welding, and the like.

[0097] In some examples, the tab connecting piece 23 includes a first contact surface in contact with the electrode connecting piece 22, and the electrode connecting piece 22 includes a second contact surface in contact with the tab connecting piece 23. The first contact surface and / or the second contact surface is provided with a protrusion / groove / rough surface / embossed structure to increase the contact area of the tab connecting piece 23 and the electrode connecting piece 22.

[0098] In some examples, the material of the tab connecting piece 23 is, for example, copper, and the material of the electrode connecting piece 22 is, for example, a nickel-plated steel strip, a nickel strip, or stainless steel.

[0099] In some embodiments, one of the shell 1, the electrode connecting piece 22, and the tab connecting piece 23 of the battery is a first metal piece, and the other two are second metal pieces. The first metal piece and the second metal piece are made of different metal materials, and the connection between the first metal piece and the second metal piece is provided with an encapsulation part 3. The first metal material is different from the second metal material.

[0100] It can be understood that by providing the encapsulation part 3 at the connection between the first metal piece and the second metal piece, that is, at the contact position of the different metal materials, the encapsulation part 3 can prevent the connection between the first metal piece and the second metal piece from contacting other substances (for example, electrolyte), so that the connection between the first metal piece and the second metal piece is not prone to corrosion, thereby improving the structural stability of the connecting piece 2 or the connection between the connecting piece 2 and the shell 1, so that the connecting piece 2 can stably connect the shell 1 and the tab.

[0101] It can be understood that two different metal materials are included in the shell 1, the electrode connecting piece 22, and the tab connecting piece 23, which can effectively ensure the stability of the connection of the connecting part 21 and the shell 1.

[0102] For example, the first metal piece is made of a first metal material, and the second metal piece is made of a second metal material, and the first metal material is different from the second metal material.

[0103] It should be noted that the metal material includes a plurality of metal atoms, and the two metal materials respectively include two groups of metal atoms. As long as one metal atom in one group is different from the metal atoms in the other group, the two groups can be considered as different metal materials. That is, as long as the metal atoms of the first metal material and the second metal material are not completely the same, that is, as long as there is one metal atom different between the first metal material and the second metal material, the first metal material and the second metal material can be considered as different.

[0104] The metal material can be pure metal, alloy, or metal matrix composite material with one or more insoluble solid particles.

[0105] The metal material can have a multi-layer structure, for example, the metal material can include a base material and a metal layer disposed on the base material. The metal layer can be formed on the base material by electroplating, CVD, or the like. The metal layer can be pure metal, alloy, or metal matrix composite material with one or more insoluble solid particles.

[0106] Specifically, the electrode connecting piece 22 and the tab connecting piece 23 are both second metal pieces, the shell 1 is a first metal piece, and the connection between the electrode connecting piece 22 and the shell 1 is provided with an encapsulation part 3.

[0107] It can be understood that the metal materials of the electrode connecting piece 22 and the shell 1 are different. By providing the encapsulation part 3 at the connection between the electrode connecting piece 22 and the shell 1, the encapsulation part 3 can prevent the connection between the electrode connecting piece 22 and the shell 1 from contacting other substances, so that the connection between the electrode connecting piece 22 and the shell 1, i.e., the connection between different metal materials, is not prone to corrosion, improving the connection stability of the electrode connecting piece 22 and the shell 1, so that the connecting piece 2 can stably connect the shell 1 and the tab.

[0108] Specifically, the electrode connecting piece 22 and the shell 1 are both second metal pieces, the tab connecting piece 23 is a first metal piece, and the connection between the electrode connecting piece 22 and the tab connecting piece 23 is provided with an encapsulation part 3.

[0109] It can be understood that the metal materials of the electrode connecting piece 22 and the tab connecting piece 23 are different, and by arranging the packaging portion 3 at the connection position of the electrode connecting piece 22 and the tab connecting piece 23, the packaging portion 3 can prevent the connection position of the electrode connecting piece 22 and the tab connecting piece 23 from contacting other substances, so that the connection position of the electrode connecting piece 22 and the tab connecting piece 23, i.e., the connection position of different metal materials, is not prone to corrosion, the connection stability of the electrode connecting piece 22 and the tab connecting piece 23 is improved, the structural stability of the connecting piece 2 is improved, so that the connecting piece 2 can stably connect the shell 1 and the tab.

[0110] For example, the electrode assembly at least includes a winding core.

[0111] According to the second aspect of the present application, the power device includes the above-mentioned battery.

[0112] According to the power device of the present application, by forming the avoiding space 235 on the side of the tab connecting piece 23 facing the inwardly recessed portion 12, when the battery is formed, i.e., when the inwardly recessed portion 12 protrudes into the mounting cavity 11, the avoiding space 235 can be used to accommodate the inwardly recessed portion 12, so that the inwardly recessed portion 12 is spaced apart from the tab connecting piece 23, avoiding the inwardly recessed portion 12 from contacting the tab connecting piece 23, i.e., the inwardly recessed portion 12 and the tab connecting piece 23 do not directly contact each other, thereby avoiding the tab connecting piece 23 from directly contacting the shell 1, which can cause the corrosion of the contact position of the tab connecting piece 23 and the shell 1, reducing the probability of corrosion of the battery, and improving the stability of the battery.

[0113] It should be noted that the power device can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the power device, and does not specifically limit the power device.

[0114] The above describes the embodiments of the present application in detail, and the specific examples are applied to the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range can be changed, and the above description should not be understood as limiting the present application.

Claims

1. A battery, characterized by, The battery comprises: a shell formed with a mounting cavity, the shell being formed with a retracted portion protruding into the mounting cavity; an electrode assembly mounted in the mounting cavity; a tab connector provided on one side of the retracted portion, the tab connector being provided with a clearance space on the side facing the retracted portion, the clearance space being used to accommodate the retracted portion so that the retracted portion is spaced apart from the tab connector.

2. The battery of claim 1, wherein, The clearance space comprises a clearance groove formed in the tab connector, the clearance groove being used to accommodate the retracted portion.

3. The battery of claim 2, wherein, The retracted portion is spaced apart from the wall surface of the clearance groove.

4. The battery of claim 2, wherein, The battery comprises an insulating sheet provided on the wall surface of the clearance groove to insulate and separate the retracted portion and the wall surface of the clearance groove.

5. The battery of claim 2, wherein, The groove depth of the clearance groove gradually increases along the direction from the side wall of the shell to the center of the shell.

6. The battery of claim 2, wherein, The groove depth of the clearance groove is F9, F9≥0.05 mm.

7. The battery of claim 2, wherein, The length of the clearance groove along the radial direction of the shell is F8, F8≥1 mm.

8. The battery according to any one of claims 1 to 7, characterized in that, The battery further comprises an insulating member connected to the side of the tab connector facing the retracted portion.

9. The battery according to any one of claims 1 to 7, characterized in that, The battery further comprises an electrode connector, the tab connector being connected to the electrode connector, the electrode connector being used to connect to the retracted portion, and the tab connector being used to connect to a tab.

10. The battery of claim 9, wherein, The electrode assembly is located between the retracted portion and the inner bottom wall of the shell, wherein, at least part of the electrode connector is located between the retracted portion and the electrode assembly; and / or, at least part of the electrode connector is located on the side of the retracted portion away from the electrode assembly.

11. The battery of any one of claims 1 to 7, wherein, The length of the clearance space along the radial length of the shell is greater than the length of the retracted portion.

12. The battery of any one of claims 1 to 6, wherein, The length of the clearance space along the radial direction of the shell is F1, F1=1 mm-(B-0.7A), where A is the diameter of the electrode assembly, and B is the inner diameter of the shell.

13. The battery of any one of claims 2 to 7, wherein, The battery further comprises a packaging portion provided on the side of the tab connector facing the retracted portion, the packaging portion being in abutment with the retracted portion.

14. The battery of claim 13, wherein, The packaging portion extends to the slot opening of the clearance groove.

15. The battery of claim 13, wherein, The height of the packaging portion protruding from the tab connector along the axial direction of the shell is F10, F10≥0.2 mm.

16. An electrical device, characterized by The battery comprises the battery as claimed in any one of claims 1 to 15.

Images