Connection structure, battery and electric equipment

Abstract

The utility model provides a connecting structure, a battery and electric equipment. The connecting structure comprises an electrode connecting piece and a tab connecting piece, the electrode connecting piece is suitable for being connected with the inner bottom wall of a shell of the battery, the tab connecting piece is connected with the electrode connecting piece, the tab connecting piece is suitable for being connected with a negative tab of the battery, and at least part of the electrode connecting piece protrudes out of the tab connecting piece. According to the connecting structure, the electrode connecting piece can be conveniently connected with the inner bottom wall of the shell, and the connecting convenience between the shell and the tab is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a connecting structure, a battery and an electric device. BACKGROUND

[0002] Batteries are widely used in energy storage systems, vehicles and consumer electronics, etc. The shell and the tab of the battery need to be connected together through a connecting structure.

[0003] In the related art, the connection convenience between the shell and the tab of the battery needs to be improved. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a connecting structure, a battery and an electric device, which can improve the technical problem of insufficient connection convenience between the shell and the tab.

[0005] In a first aspect, embodiments of the present application provide a battery, comprising:

[0006] An electrode connecting piece adapted to be connected to an inner bottom wall of a shell of the battery;

[0007] A tab connecting piece connected to the electrode connecting piece, the tab connecting piece being adapted to be connected to a negative tab of the battery;

[0008] At least part of the electrode connecting piece protrudes from the tab connecting piece.

[0009] In an embodiment, the tab connecting piece is provided with a mounting groove, and the electrode connecting piece is inserted into the mounting groove.

[0010] In an embodiment, a mounting space is formed between the electrode connecting piece and a side wall of the mounting groove, and the mounting space is used for mounting an encapsulation part.

[0011] In an embodiment, along a radial direction of the shell, a length of the mounting groove is G1, and G1≥1mm; and / or,

[0012] A groove depth of the mounting groove is G2, and G2≥0.05mm.

[0013] In an embodiment, the battery further comprises an encapsulation part, wherein:

[0014] At least part of the encapsulation part is arranged at a connection position of the tab connecting piece and the electrode connecting piece; and / or,

[0015] At least part of the encapsulation part is arranged at a connection position of the electrode connecting piece and the inner bottom wall of the shell.

[0016] In an embodiment, along an axial direction of the shell, a height of the encapsulation part is G3, and G3≥0.2mm; and / or,

[0017] The width of the encapsulation portion along the radial direction of the shell is G5, and G5≥0.3 mm.

[0018] In an embodiment, the length of the connection between the electrode connecting member and the inner bottom wall of the shell along the radial direction of the shell is G8, and G8≥2 mm.

[0019] In an embodiment, the electrode connecting member is in a bent structure, and the bent portion of the electrode connecting member is provided with an encapsulation portion.

[0020] In an embodiment, the electrode connecting member comprises a bottom wall connecting portion, an intermediate portion and a fixing portion connected in sequence, the bottom wall connecting portion is adapted to be connected with the inner bottom wall of the shell of the battery, and the fixing portion is fixedly connected with the tab connecting member.

[0021] In an embodiment, the intermediate portion is arranged obliquely relative to the bottom wall connecting portion and / or the fixing portion.

[0022] In an embodiment, the connection between the bottom wall connecting portion and the intermediate portion is provided with an encapsulation portion; and / or,

[0023] the connection between the intermediate portion and the fixing portion is provided with an encapsulation portion.

[0024] In an embodiment, the central axis of the electrode connecting member coincides with the central axis of the connecting structure.

[0025] In a second aspect, embodiments of the present application provide a battery comprising a shell, an electrode assembly and a connecting structure as described above, the shell is formed with a mounting cavity, the electrode assembly is mounted in the mounting cavity, and the connecting structure is located between the electrode assembly and the inner bottom wall of the shell.

[0026] In an embodiment, the tab connecting member is arranged spaced apart from the side wall surface of the shell.

[0027] In an embodiment, the connection between the electrode connecting member and the inner bottom wall of the shell is provided with an encapsulation portion.

[0028] In a third 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 embodiments of the present application, when the connecting structure is used to connect the inner bottom wall of the battery shell and the negative tab, the connecting structure is arranged between the inner bottom wall of the shell and the negative tab, the tab connecting piece can be connected with the negative tab, and since the electrode connecting piece is at least partially arranged protruding from the tab connecting piece, the electrode connecting piece can protrude towards the inner bottom wall of the shell, facilitating the connection of the electrode connecting piece with the inner bottom wall of the shell, and improving the convenience of the connection between the shell and the tab. 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 following 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 effort.

[0032] Figure 1 is a structural schematic diagram of a battery provided by an embodiment of the present application;

[0033] Figure 2 is a partial structural schematic diagram of a tab connecting piece provided by an embodiment of the present application;

[0034] Figure 3 is one of partial structural schematic diagrams of a battery provided by an embodiment of the present application;

[0035] Figure 4 is another of partial structural schematic diagrams of a battery provided by an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are 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 in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the outline of the device.

[0037] The connecting structure, battery and electric device of the present application will be described below in combination with Figures 1 to 4

[0038] According to the embodiments of the first aspect of the present application, with reference to Figure 1 ​The connecting structure comprises an electrode connecting piece 22 and a tab connecting piece 23. The electrode connecting piece 22 is adapted to be connected to the inner bottom wall 13 of the battery shell 1. The tab connecting piece 23 is connected to the electrode connecting piece 22 and is adapted to be connected to the negative tab of the battery.

[0039] At least part of the electrode connecting piece 22 protrudes from the tab connecting piece 23.

[0040] According to the connecting structure of the present application, when the inner bottom wall 13 of the battery shell 1 and the negative tab are connected by the connecting structure, the connecting structure is arranged between the inner bottom wall 13 of the battery shell 1 and the negative tab. The tab connecting piece 23 can be connected to the negative tab. Since at least part of the electrode connecting piece 22 protrudes from the tab connecting piece 23, the electrode connecting piece 22 can protrude towards the inner bottom wall 13 of the battery shell 1, facilitating the connection of the electrode connecting piece 22 to the inner bottom wall 13 of the battery shell 1 and improving the convenience of the connection between the battery shell 1 and the tab.

[0041] It can be understood that the electrode connecting piece 22 protrudes from the tab connecting piece 23, so that the electrode connecting piece 22 can be directly connected to the inner bottom wall 13 of the battery shell 1, simplifying the connecting structure.

[0042] In some embodiments, referring to Figure 1 and Figure 2 The tab connecting piece 23 is provided with a mounting groove 237, and the electrode connecting piece 22 is inserted into the mounting groove 237.

[0043] It can be understood that the mounting groove 237 can limit the electrode connecting piece 22, thereby improving the connection stability of the electrode connecting piece 22 and the tab connecting piece 23.

[0044] In some embodiments, a mounting space is formed between the electrode connecting piece 22 and the side wall of the mounting groove 237, and the mounting space is used for mounting the packaging portion 3.

[0045] It can be understood that by spacing the electrode connecting piece 22 from the side wall of the mounting groove 237, a mounting space for mounting the packaging portion 3 can be formed between the electrode connecting piece 22 and the side wall of the mounting groove 237. The packaging portion 3 is arranged at the connection between the electrode connecting piece 22 and the tab connecting piece 23 to improve the corrosion resistance of the connection between the electrode connecting piece 22 and the tab connecting piece 23.

[0046] In some embodiments, referring to Figure 1 and Figure 3 The length of the mounting groove 237 along the radial direction of the shell 1 is G1, and G1≥1mm.

[0047] It can be understood that if the length of the mounting groove 237 is less than 1 mm, the mounting groove 237 cannot effectively limit the electrode connecting piece 22, and therefore the length of the mounting groove 237 is greater than or equal to 1 mm in the application.

[0048] In some embodiments, referring to Figure 1 and Figure 3 , the groove depth of the mounting groove 237 is G2, and G2≥0.05 mm.

[0049] It can be understood that if the groove depth of the mounting groove 237 is less than 0.05 mm, the mounting groove 237 cannot effectively limit the electrode connecting piece 22, and therefore the groove depth of the mounting groove 237 is greater than or equal to 0.05 mm in the application.

[0050] In some embodiments, referring to Figure 1 and Figure 3 , the battery further comprises a packaging portion 3.

[0051] Specifically, at least part of the packaging portion 3 is arranged at the connection between the tab connecting piece 23 and the electrode connecting piece 22.

[0052] It can be understood that the electrode connecting piece 22 is arranged in the mounting groove 237 of the tab connecting piece 23, and the packaging portion 3 can seal the slot of the mounting groove 237 by being arranged at the connection between the tab connecting piece 23 and the electrode connecting piece 22, so as to prevent impurities from entering the mounting groove 237 and avoid affecting the connection strength of the tab connecting piece 23 and the electrode connecting piece 22. That is, the packaging portion 3 can seal and isolate the position between the electrode connecting piece 22 and the slot of the mounting groove 237, so that the contact position of the electrode connecting piece 22 and the slot of the mounting groove 237 does not contact other substances, and other substances cannot enter the mounting groove 237, thereby effectively preventing corrosion at the connection between the electrode connecting piece 22 and the tab connecting piece 23.

[0053] Specifically, at least part of the packaging portion 3 is arranged at the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1.

[0054] It can be understood that the packaging portion 3 can play a sealing and protecting role at the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 by being arranged at the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1, so as to prevent impurities from entering the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 and avoid affecting the connection strength of the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1.

[0055] In some examples, referring to Figure 1 and Figure 3The height of the packaging portion 3 along the axial direction of the shell 1 is G3, and G3≥0.2 mm.

[0056] It can be understood that if the height of the packaging portion 3 is less than 0.2 mm, the packaging portion 3 cannot effectively protect the connection between the tab connecting piece 23 and the electrode connecting piece 22, and impurities can enter the connection between the tab connecting piece 23 and the electrode connecting piece 22. The packaging portion 3 also cannot effectively protect the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1, and impurities can enter the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1. Therefore, the height of the packaging portion 3 is set to be greater than or equal to 0.2 mm.

[0057] In some examples, referring to Figure 1 and Figure 3 , the width of the packaging portion 3 along the radial direction of the shell 1 is G5, and G5≥0.3 mm.

[0058] It can be understood that if the width of the packaging portion 3 is less than 0.3 mm, the packaging portion 3 cannot effectively protect the connection between the tab connecting piece 23 and the electrode connecting piece 22, and impurities can enter the connection between the tab connecting piece 23 and the electrode connecting piece 22. The packaging portion 3 also cannot effectively protect the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1, and impurities can enter the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1. Therefore, the width of the packaging portion 3 is set to be greater than or equal to 0.2 mm.

[0059] In some embodiments, referring to Figure 1 and Figure 3 , the connection length of the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 along the radial direction of the shell 1 is G8, and G8≥2 mm.

[0060] It can be understood that if the connection length of the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 is less than 2 mm, the stability of the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 can be insufficient. Therefore, the connection length of the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 is set to be greater than or equal to 2 mm.

[0061] In some embodiments, the electrode connecting piece 22 is a bent structure, and the bent portion of the electrode connecting piece 22 is provided with a packaging portion 3.

[0062] It can be understood that by arranging the encapsulation part 3 at the bending part of the electrode connecting piece 22, the encapsulation part 3 can encapsulate and protect the bending part of the electrode connecting piece 22, prevent impurities from entering the bending part of the electrode connecting piece 22, and avoid that the impurities (such as electrolyte) cause corrosion of the electrode connecting piece 22 to affect the structural strength of the bending part of the electrode connecting piece 22.

[0063] In some embodiments, referring to Figure 1 and Figure 3 , the electrode connecting piece 22 comprises a bottom wall connecting part 227, an intermediate part 228 and a fixing part 229 connected in sequence, the bottom wall connecting part 227 is adapted to be connected with the inner bottom wall 13 of the shell 1 of the battery, and the fixing part 229 is fixedly connected with the tab connecting piece 23.

[0064] It can be understood that the tab connecting piece 23, the fixing part 229, the intermediate part 228 and the bottom wall connecting part 227 are connected in sequence, so that the electrode connecting piece 22 connects the shell 1 and the tab connecting piece 23, and realizes the connection of the shell 1 and the tab.

[0065] In some embodiments, referring to Figure 1 and Figure 4 , the intermediate part 228 is arranged obliquely relative to the bottom wall connecting part 227 and / or the fixing part 229.

[0066] It can be understood that the oblique arrangement of the intermediate part 228 can reduce the overall height of the electrode connecting piece 22 while connecting the bottom wall connecting part 227 and the fixing part 229, thereby reducing the height of the entire connecting structure and being beneficial to the miniaturization design of the battery.

[0067] In some embodiments, referring to Figure 1 and Figure 4 , the connection part between the bottom wall connecting part 227 and the intermediate part 228 is provided with an encapsulation part 3.

[0068] It can be understood that the encapsulation part 3 can protect the connection part between the bottom wall connecting part 227 and the intermediate part 228, avoid the connection part between the bottom wall connecting part 227 and the intermediate part 228 from contacting other substances (such as electrolyte), effectively prevent corrosion of the connection part between the bottom wall connecting part 227 and the intermediate part 228, and improve the connection stability of the bottom wall connecting part 227 and the intermediate part 228.

[0069] In some embodiments, referring to Figure 1 and Figure 4 , the connection part between the intermediate part 228 and the fixing part 229 is provided with an encapsulation part 3.

[0070] It can be understood that the encapsulation part 3 can protect the connection between the intermediate part 228 and the fixed part 229, avoid the connection between the intermediate part 228 and the fixed part 229 from contacting other substances (such as electrolyte), effectively prevent the connection between the intermediate part 228 and the fixed part 229 from being corroded, and improve the connection stability of the intermediate part 228 and the fixed part 229.

[0071] In some embodiments, the central axis of the electrode connecting piece 22 coincides with the central axis of the connecting structure.

[0072] It can be understood that the electrode connecting piece 22 is located at the middle position of the connecting structure, so that the electrode connecting piece 22 is arranged opposite to the inner bottom wall 13 of the shell 1, facilitating the connection of the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1.

[0073] In some examples, the encapsulation part 3 is, for example, encapsulation glue, and the material of the encapsulation glue is polyurethane type, epoxy resin 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.

[0074] In some examples, the electrode connecting piece 22 is connected with the tab connecting piece 23 by surface chemical treatment, such as electroplating, chemical plating, spraying, etc. The electrode connecting piece 22 can also be connected with the tab connecting piece 23 by surface physical treatment, such as composite metal stamping, etc.

[0075] In some examples, the tab connecting piece 23 and the electrode connecting piece 22 can be connected together by welding, cold upsetting, thermal compounding, jointing, riveting, heat shrink tube, etc. The electrode connecting piece 22 and the shell 1 can be connected by laser welding, spot welding, resistance welding, etc.

[0076] 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.

[0077] 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, nickel-plated steel strip, nickel strip, stainless steel.

[0078] In some embodiments, one of the inner bottom wall of the shell 1, the electrode connecting piece 22 and the tab connecting piece 23 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 the encapsulation part 3. The first metal material is different from the second metal material.

[0079] It can be understood that, by arranging the encapsulation part 3 at the connection between the first metal member and the second metal member, i.e. at the contact position of different metal materials, the encapsulation part 3 can prevent the connection between the first metal member and the second metal member from contacting other substances (such as electrolyte), so that the connection between the first metal member and the second metal member is not prone to corrosion, thereby improving the structural stability of the connecting member 2 or the connection between the connecting member 2 and the inner bottom wall of the shell 1, so that the connecting member 2 can stably connect the inner bottom wall of the shell 1 and the tab.

[0080] It can be understood that, the inner bottom wall of the shell 1, the electrode connecting member 22 and the tab connecting member 23 all include two different metal materials, which can effectively ensure the stability of the connection between the connecting part 21 and the shell 1.

[0081] For example, the first metal member is of a first metal material, and the second metal member is of a second metal material, and the first metal material and the second metal material are different.

[0082] 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 atom 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, i.e. as long as there is one different metal atom between the first metal material and the second metal material, the first metal material and the second metal material can be considered as different.

[0083] The metal material can be pure metal, alloy, or metal matrix composite material with one or more insoluble solid particles.

[0084] The metal material can have a multi-layer structure, for example: the metal material can include a base material and a metal layer arranged 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.

[0085] Specifically, the electrode connecting member 22 and the tab connecting member 23 are both the second metal member, the inner bottom wall of the shell 1 is the first metal member, and the connection between the electrode connecting member 22 and the inner bottom wall of the shell 1 is provided with the encapsulation part 3.

[0086] It can be understood that the metal materials of the electrode connecting piece 22 and the inner bottom wall of the shell 1 are different, and by arranging the encapsulation part 3 at the connection between the electrode connecting piece 22 and the inner bottom wall of the shell 1, the encapsulation part 3 can prevent the connection between the electrode connecting piece 22 and the inner bottom wall of the shell 1, i.e., the connection between different metal materials, from contacting other substances, so that the connection between the electrode connecting piece 22 and the inner bottom wall of the shell 1, i.e., the connection between different metal materials, is not prone to corrosion, the connection stability of the electrode connecting piece 22 and the shell 1 is improved, and the inner bottom wall of the shell 1 and the tab can be stably connected by the connecting piece 2.

[0087] Specifically, the electrode connecting piece 22 and the inner bottom wall of the shell 1 are both the second metal piece, the tab connecting piece 23 is the first metal piece, and the connection between the electrode connecting piece 22 and the tab connecting piece 23 is provided with the encapsulation part 3.

[0088] 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 encapsulation part 3 at the connection between the electrode connecting piece 22 and the tab connecting piece 23, the encapsulation part 3 can prevent the connection between the electrode connecting piece 22 and the tab connecting piece 23, i.e., the connection between different metal materials, from contacting other substances, so that the connection between the electrode connecting piece 22 and the tab connecting piece 23, i.e., the connection between 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, and the inner bottom wall of the shell 1 and the tab can be stably connected by the connecting piece 2.

[0089] According to the embodiment of the second aspect of the application, referring to Figure 1 The battery comprises a shell 1, an electrode assembly, and a connecting structure, the shell 1 is formed with a mounting cavity 11, the electrode assembly is mounted in the mounting cavity 11, and the connecting structure is located between the electrode assembly and the inner bottom wall 13 of the shell 1.

[0090] It can be understood that when the inner bottom wall 13 of the battery shell 1 and the negative tab are connected by the connecting structure, the tab connecting piece 23 can be connected with the negative tab, and since at least part of the electrode connecting piece 22 protrudes from the tab connecting piece 23, the electrode connecting piece 22 can protrude towards the inner bottom wall 13 of the shell 1, so that the electrode connecting piece 22 is convenient to connect with the inner bottom wall 13 of the shell 1, and the connection convenience between the shell 1 and the tab is improved. Moreover, the electrode connecting piece 22 protrudes from the tab connecting piece 23, so that the electrode connecting piece 22 can be directly connected with the inner bottom wall 13 of the shell 1, and the connecting structure is simplified.

[0091] In some embodiments, referring to Figure 4The lug connecting piece 23 is arranged apart from the side wall surface of the shell 1 to avoid direct contact between the lug connecting piece 23 and the side wall surface of the shell 1, thereby reducing the contact points between the connecting structure and the shell 1 and avoiding corrosion caused by the contact between the lug connecting piece 23 and the shell 1.

[0092] In some embodiments, referring to Figure 1 and Figure 1 Figure 1 Figure 3 The connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 is provided with an encapsulation part 3.

[0093] It can be understood that the encapsulation part 3 can protect the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1, avoid contact between the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1 and other substances (such as electrolyte), effectively prevent corrosion of the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1, and improve the connection stability of the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1.

[0094] According to the third aspect of the present application, the power equipment includes the above-mentioned battery.

[0095] According to the power equipment of the present application, when the inner bottom wall 13 of the shell 1 and the negative lug are connected by the connecting structure, the connecting structure is arranged between the inner bottom wall 13 of the shell 1 and the negative lug, the lug connecting piece 23 can be connected with the negative lug, and since at least part of the electrode connecting piece 22 protrudes from the lug connecting piece 23, the electrode connecting piece 22 can protrude towards the inner bottom wall 13 of the shell 1, facilitating the connection between the electrode connecting piece 22 and the inner bottom wall 13 of the shell 1, and improving the connection convenience between the shell 1 and the lug.

[0096] It should be noted that the power equipment can be a vehicle, an aircraft, or a household appliance. It should be noted that the foregoing is only an example of the power equipment, and does not specially limit the power equipment.

[0097] 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 of the present application; meanwhile, for those skilled in the art, the specific implementation mode and application range can be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A connection structure characterized by comprising: The battery comprises: an electrode connecting piece adapted to be connected with an inner bottom wall of a shell of the battery; an ear connecting piece connected with the electrode connecting piece, the ear connecting piece being adapted to be connected with a negative electrode ear of the battery; wherein at least part of the electrode connecting piece protrudes from the ear connecting piece.

2. The connection structure according to claim 1, characterized in that The ear connecting piece is provided with a mounting groove, and the electrode connecting piece is inserted into the mounting groove.

3. The connection structure according to claim 2, characterized in that An installation space is formed between the electrode connecting piece and a side wall of the mounting groove, and the installation space is used for installing an encapsulation part.

4. The connection structure according to claim 2, characterized by Along a radial direction of the shell, a length of the mounting groove is G1, and G1≥1mm; and / or, A groove depth of the mounting groove is G2, and G2≥0.05mm.

5. The connection structure according to claim 1, wherein The battery further comprises an encapsulation part, wherein at least part of the encapsulation part is arranged at a connection position of the ear connecting piece and the electrode connecting piece; and / or at least part of the encapsulation part is arranged at a connection position of the electrode connecting piece and the inner bottom wall of the shell.

6. The connection structure according to claim 5, wherein Along an axial direction of the shell, a height of the encapsulation part is G3, and G3≥0.2mm; and / or Along the radial direction of the shell, a width of the encapsulation part is G5, and G5≥0.3mm.

7. The connection structure according to claim 1, wherein Along the radial direction of the shell, a connection length of the electrode connecting piece and the inner bottom wall of the shell is G8, and G8≥2mm.

8. The connection structure according to claim 1, wherein The electrode connecting piece is in a bent structure, and a bent position of the electrode connecting piece is provided with an encapsulation part.

9. The connection structure according to any one of claims 1 to 8, characterized in that The electrode connecting piece comprises a bottom wall connecting part, an intermediate part and a fixing part connected in sequence, the bottom wall connecting part being adapted to be connected with the inner bottom wall of the shell of the battery, and the fixing part being fixedly connected with the ear connecting piece.

10. The connection structure according to claim 9, wherein The intermediate part is arranged to be inclined relative to the bottom wall connecting part and / or the fixing part.

11. The connection structure according to claim 9, wherein An encapsulation part is arranged at a connection position of the bottom wall connecting part and the intermediate part; and / or An encapsulation part is arranged at a connection position of the intermediate part and the fixing part.

12. The connection structure according to any one of claims 1 to 8, characterized by A central axis of the electrode connecting piece coincides with a central axis of the connecting structure.

13. A battery, characterized by The battery comprises a shell, an electrode assembly and the connecting structure according to any one of claims 1 to 12, the shell is formed with a mounting cavity, the electrode assembly is mounted in the mounting cavity, and the connecting structure is arranged between the electrode assembly and an inner bottom wall of the shell.

14. The battery of claim 13, wherein, The ear connecting piece is arranged to be spaced apart from a side wall surface of the shell.

15. The battery according to claim 13 or 14, characterized in that An encapsulation part is arranged at a connection position of the electrode connecting piece and the inner bottom wall of the shell.

16. An electrical device, characterized by The battery comprises the battery according to any one of claims 13 to 15.

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