Battery, electronic equipment and preparation method of battery

Abstract

The invention relates to a battery, electronic equipment and a preparation method of the battery, the battery comprises a battery cell main body and a first tab, the first tab comprises a first metal layer, the first metal layer comprises a first connecting part, a first buffer part and a second connecting part, the first buffer part comprises a first end and a second end, the first connecting part is connected to the first end, and the second connecting part is connected to the second end; the first connecting part is connected to the first end, the second connecting part is connected to the second end, the wiring length between the first end and the second end is larger than the linear distance between the first end and the second end, the first buffer part can deform, the first connecting part is electrically connected with the battery cell main body, and the second connecting part is used for being electrically connected with an external device; and the second connecting part can generate displacement relative to the first connecting part through the deformation of the first buffer part. According to the structure, the space occupied by the head of the battery cell main body in the battery can be reduced, the second connecting part and the external device can be conveniently matched and connected, and the connection reliability among the battery cell main body, the first tab and the external device can be improved.

Description

Technical Field

[0001] This application relates to the field of communication equipment technology, specifically to a battery, an electronic device, and a method for preparing the battery. Background Technology

[0002] As mobile devices such as smartphones carry increasingly more functions, people's demand for longer battery life is also growing, leading to a stronger need for high-capacity batteries. Traditional batteries typically consist of cells and a battery protection board. To improve the installation space of the cells, the battery protection board is usually integrated into the motherboard, connecting the cells to the motherboard. Related technologies use adapters to connect the tabs at the cell head, allowing the tabs to connect to the motherboard. However, to ensure reliable connection, the adapter structure is relatively complex, occupying a large space at the cell head, which is detrimental to increasing cell capacity. Furthermore, the adapter has weak positional tolerance adjustment capability between the cell and the motherboard. When the positional tolerance between the battery and the motherboard is large, it is difficult for the adapter to absorb the positional tolerance, resulting in an unreliable electrical connection between the cell and the motherboard. Summary of the Invention

[0003] In view of this, this application provides a battery, an electronic device, and a method for manufacturing a battery to solve the problem that in the related technology, the adapter device tends to occupy a large space at the head of the battery cell, which is not conducive to the improvement of the battery cell capacity. Moreover, the adapter device has a weak ability to adjust the positional tolerance between the battery cell and the motherboard. When the positional tolerance between the battery and the motherboard is large, it is difficult to absorb the positional tolerance through the adapter device, which leads to the problem that the battery cell and the motherboard cannot be reliably electrically connected.

[0004] A first aspect of this application provides a battery, including a cell body and a first tab. The first tab includes a first metal layer, the first metal layer including a first connecting portion, a first buffer portion, and a second connecting portion. The first buffer portion includes a first end and a second end. The first connecting portion is connected to the first end, and the second connecting portion is connected to the second end. The trace length between the first end and the second end is greater than the straight-line distance between the first end and the second end. The first buffer portion is deformable. The first connecting portion is electrically connected to the cell body, and the second connecting portion is used for electrical connection to an external device. The second connecting portion is displaced relative to the first connecting portion by the deformation of the first buffer portion.

[0005] In this application, the main body of the battery cell is directly connected to the first connecting portion of the first tab, and is electrically connected to the external device of the electronic device directly through the second connecting portion of the first tab. This structure is simple and small in size, reducing the space occupied by the main body of the battery cell within the battery, thereby improving the volume of the main body and increasing the energy density of the battery. Simultaneously, since the trace length between the first and second ends is greater than the straight-line distance between them, the first buffer portion has a certain redundant length in both the first and second directions. This allows the first buffer portion to undergo adaptive deformation in space under external force, enabling the second connecting portion to displace relative to the first connecting portion through the deformation of the first buffer portion. This allows the second connecting portion to absorb the positional tolerance between the first connecting portion and the main body of the battery cell, making it easier for the second connecting portion to achieve a matching connection with the external device. Furthermore, the first buffer portion also acts as a buffer during the connection process between the first tab and the external device, absorbing some of the tensile force, thereby improving the connection reliability between the first connecting portion and the main body of the battery cell, and between the second connecting portion and the external device.

[0006] In one possible design, the trace between the first end and the second end includes one or more combinations of arc or polygonal shapes.

[0007] This structure enables the second connecting part to move in any direction in space through the first buffer part. For example, the second connecting part can be displaced in the first direction, the second direction, the thickness direction, or the resultant force direction of any two directions through the first buffer part. Moreover, this structure can increase the redundant length of the first buffer part without further increasing the space occupied by the first buffer part in the first direction, thereby increasing the movement distance of the second connecting part relative to the first connecting part, making it easier for the second connecting part to achieve matching connection with external devices.

[0008] In one possible design, the traces between the first end and the second end form an S-shape, Z-shape, or W-shape, which is simple in structure, easy to manufacture, and conducive to mass production.

[0009] In one possible design, the thickness of the first buffer portion is greater than or equal to the thickness of the first connecting portion and the second connecting portion.

[0010] This structural design can increase the cross-sectional area of ​​the first buffer section, thereby increasing the current flow rate in the first buffer section and improving the current flow effect of the first tab.

[0011] In one possible design, the first tab further includes a cover film layer covering at least a portion of the first metal layer, and at least a portion of the second connection portion is exposed outside the cover film layer to form a second connection end.

[0012] The cover film is an insulating film layer that covers at least a portion of the metal layer, protecting it from damage due to oxidation and corrosion, and ensuring the long-term stability of its conductivity. The second connection end, located at the second connection portion, can connect to the formation fixture during battery formation. That is, during battery production, an electrical connection can be established with the cell body through the second connection end for battery formation, further simplifying the manufacturing process. Furthermore, since battery formation does not require the first solder pad, damage to the first solder pad during battery production is avoided, thereby improving the reliability of the connection between the first tab and external devices.

[0013] In one possible design, the first tab further includes a first seal disposed on the side of the cover film layer near the second connection end for sealing the second connection end.

[0014] The first seal protects the second connection end from damage caused by oxidation and corrosion, and also prevents short circuits at the second connection end, further enhancing the safety and reliability of the first tab. Simultaneously, the first seal can be tightly connected to at least a portion of the cover film at the second connection end, thereby preventing delamination of the cover film at the second connection end during battery production and improving the structural stability of the first tab.

[0015] In one possible design, a notch penetrating the first metal layer is provided at the second connection end, and at least a portion of the covering film layer is disposed at the notch.

[0016] The covering membrane layers at the notch are interconnected in the thickness direction, which can also increase the cross-sectional area of ​​the covering membrane layer at the second connection end, increase the contact area between the covering membrane layer and the first seal, thereby increasing the connection strength between the first seal and the covering membrane layer, and further improving the structural stability of the first electrode tab, ensuring the safety and reliability of the first electrode tab.

[0017] In one possible design, at least a portion of the first connection is exposed outside the covering film to form a first connection end.

[0018] The surface of the first connecting end located in the first connecting part is not covered with a film layer, which facilitates the electrical connection between the first electrode and the cell body and improves the battery manufacturing efficiency.

[0019] In one possible design, the first tab further includes a second seal, which is disposed on the side of the cover film layer near the first connection end, and the first connection portion passes through the second seal.

[0020] The second seal is used to block the opening of the cover film and can prevent the electrolyte in the battery from contacting the cover film and corroding it.

[0021] In one possible design, at least a portion of the second seal covers the outer surface of the cover film, thereby further reducing the risk of direct contact between the cover film and the electrolyte and improving the safety and reliability of the first tab.

[0022] In one possible design, the first tab further includes a first pad that passes through the cover film layer and is electrically connected to the second connection portion, which is electrically connected to the external device through the first pad.

[0023] The structure is simple and has high connection strength, which improves the reliability of the connection between the first electrode and the external device.

[0024] In one possible design, the first tab includes a positive tab and a negative tab, and the battery further includes a second tab. The second tab is electrically connected to the cell body and to either the positive tab or the negative tab. The second tab can be centrally connected to either the positive or negative tab, thereby forming a multi-tab structure, reducing battery impedance, and improving current conduction.

[0025] In one possible design, the first metal layer of either the positive electrode tab or the negative electrode tab further includes a third connecting portion, which is connected to the first buffer portion. The third connecting portion is provided with a second pad, which is electrically connected to the second electrode tab.

[0026] The third connecting part extends along the second direction and connects with the first buffer part, so that the third connecting part can generate a certain displacement in space relative to the first connecting part through the first buffer part, thereby facilitating the connection between the third connecting part and the second electrode. The first buffer part has a certain buffering effect and can absorb part of the tensile force, thereby improving the connection reliability between the third connecting part and the second electrode.

[0027] In one possible design, the second tab includes a second metal layer, the second metal layer includes a fourth connecting portion, a second buffer portion, and a fifth connecting portion, the second buffer portion includes a third end and a fourth end, the fourth connecting portion is connected to the third end, the fifth connecting portion is connected to the fourth end, the trace length between the third end and the fourth end is greater than the straight-line distance between the third end and the fourth end, the second buffer portion can deform, the fourth connecting portion is connected to the cell body, and the fifth connecting portion is provided with a third solder pad, the third solder pad being electrically connected to the second solder pad.

[0028] Because the trace length between the third and fourth ends is greater than the straight-line distance between the third and fourth ends, the second buffer part has a certain redundant length in the first and second directions. This allows the second buffer part to undergo adaptive deformation in space under external force, thereby enabling the fifth connecting part to be displaced in space relative to the fourth connecting part through the deformation of the second buffer part. This facilitates the connection between the fifth connecting part and the first electrode tab. Furthermore, the second buffer part has a certain buffering effect, which can absorb some of the tensile force, thereby further improving the connection reliability between the second electrode tab and the first electrode tab.

[0029] A second aspect of this application provides an electronic device, including an external device and a battery as described in any of the above embodiments, wherein the battery is electrically connected to the external device. Since the battery has the aforementioned effects, the electronic device including this battery should also possess corresponding technical effects, which will not be elaborated further here.

[0030] In one possible design, the electronic device further includes a first seal disposed at the second connection end of the first tab of the battery for sealing the second connection end.

[0031] The first seal protects the second connection end from damage caused by oxidation and corrosion, and also prevents short circuits at the second connection end, further enhancing the safety and reliability of the first tab. Simultaneously, the first seal can be tightly connected to at least a portion of the cover film at the second connection end, thereby preventing delamination of the cover film at the second connection end during battery production and improving the structural stability of the first tab.

[0032] A third aspect of this application provides a method for preparing a battery, used to prepare the battery described in any of the above embodiments, the method comprising the following steps:

[0033] Prepare the electrode sheet for the main body of the battery cell.

[0034] In this step, the main body of the battery cell can be a stacked battery or a wound battery.

[0035] Prepare a first tab to form a first connecting part, a first buffer part, and a second connecting part.

[0036] In this step, the first connecting part is used for electrical connection with the electrode core body during battery manufacturing, and the second connecting part is used for establishing electrical connection with the cell body during battery formation. The second connecting part may also be provided with a first solder pad for electrical connection with external devices of electronic equipment. The second connecting part can be displaced relative to the first connecting part via a first buffer part.

[0037] The first connecting part is electrically connected to the electrode plate of the battery cell body.

[0038] In this step, the first connecting part can be electrically connected to the electrode sheet of the battery cell body through welding methods such as ultrasonic welding and laser welding.

[0039] The electrode sheet connected to the first tab forms the main body of the battery cell.

[0040] In this step, the electrode sheet connected to the first tab can be formed into the main body of the battery cell by winding or stacking.

[0041] Battery formation is carried out.

[0042] In this step, the formation equipment and the cell body can be electrically connected through the second connection part to achieve battery formation.

[0043] The first buffer section is punched.

[0044] In this step, the first buffer portion is punched so that the second connecting portion can be displaced relative to the first connecting portion through the first buffer portion.

[0045] The main body of the battery cell is directly connected to the first connecting part of the first tab, and is electrically connected to external devices of the electronic device directly through the second connecting part of the first tab. This structure is simple and small in size, reducing the space occupied by the main body of the battery cell within the battery, thereby improving the volume of the main body and increasing the energy density of the battery. Simultaneously, the second connecting part can be displaced relative to the first connecting part in space by the deformation of the first buffer part, allowing the second connecting part to absorb positional tolerances between the first connecting part and the main body of the battery, thus making it easier for the second connecting part to achieve a matching connection with external devices. Furthermore, the first buffer part also acts as a buffer during the connection process between the first tab and the external device, absorbing some of the tensile force, thereby improving the connection reliability between the first connecting part and the main body of the battery cell, and between the second connecting part and the external device.

[0046] In one possible design, the battery formation specifically includes:

[0047] Battery formation is performed through the exposed metal layer portion of the second connection end of the second connection part.

[0048] The exposed metal layer can be connected to the formation fixture, thereby establishing an electrical connection between the formation equipment and the cell body for battery formation. This simplifies the manufacturing process and, since battery formation does not require passing through the first pad, it avoids damage to the first pad during battery production, thus improving the reliability of the connection between the first tab and external devices.

[0049] In one possible design, after battery formation is performed on the exposed metal layer portion of the second connection end through the second connection portion, the method further includes:

[0050] The second connecting part is cut to remove the exposed metal layer of the second connecting end.

[0051] In this step, the exposed metal layer can be removed by means of laser, shearing, etc., which can further reduce the volume of the first electrode tab and facilitate the subsequent sealing of the second connection end.

[0052] The cut second connecting end is sealed to form a first sealing element at the second connecting end.

[0053] In this step, the first seal is formed by curing materials such as adhesive dispensing and UV adhesive.

[0054] The first seal protects the second connection end from damage caused by oxidation and corrosion, and also prevents short circuits at the second connection end, further enhancing the safety and reliability of the first tab. Simultaneously, the first seal can be tightly connected to at least a portion of the cover film at the second connection end, thereby preventing delamination of the cover film at the second connection end during battery production and improving the structural stability of the first tab.

[0055] In one possible design, the fabrication of the first electrode tab to form a first connecting portion, a first buffer portion, and a second connecting portion specifically includes:

[0056] A metal layer is prepared to form a first connecting portion, a first buffer portion, and a second connecting portion.

[0057] In this step, the metal layer can be a one-piece molded structure, which makes the transition at the connection between the parts of the metal layer smoother, which is conducive to current flow and facilitates the mass production of the metal layer, saving preparation costs and improving preparation efficiency.

[0058] A covering film is formed on the outer surface of the metal layer, and the covering film is interconnected at the gaps of the multiple bending segments of the first buffer portion.

[0059] In this step, the covering film is connected to each other at the gaps between the multiple bending segments of the first buffer section. This can keep the bending segments of the first buffer section stable during the battery manufacturing process, thereby preventing the first buffer section from being overstretched and damaged, and ensuring the structural stability of the first buffer section.

[0060] In one possible design, prior to forming the covering film layer on the outer surface of the metal layer, the method further includes:

[0061] A through hole is formed at the second connecting end of the second connecting part.

[0062] In this step, the through hole can be in various shapes such as rectangle, circle, or rhombus.

[0063] A through-hole is formed at the second connecting end of the second connecting part. This allows the material of the cover film to fill the through-hole during the preparation of the cover film layer. This enables the cover film layers at the through-hole to connect with each other in the thickness direction, preventing delamination between the cover film layer and the metal layer during battery production. It also reduces the cutting area of ​​the metal layer after removing the exposed metal layer, increasing the connection area between the cover film layer and the first sealing element. This improves the connection strength between the first sealing element and the cover film layer, further enhancing the structural stability of the first electrode tab and ensuring its safety and reliability.

[0064] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0065] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 This is a schematic diagram of the structure of a battery in one embodiment of the related technology;

[0067] Figure 2 A schematic diagram of the structure of the battery provided in this application in a specific embodiment;

[0068] Figure 3 A schematic diagram of the structure of the metal layer of the first electrode provided in this application in a specific embodiment;

[0069] Figure 4 A top view of the battery provided in this application in one specific embodiment;

[0070] Figure 5 A top view of the metal layer of the first electrode in one specific embodiment is provided for the purposes of this application;

[0071] Figure 6 The present application provides a side view of the metal layer of the first electrode tab in one specific embodiment;

[0072] Figure 7 An explosion diagram of the first electrode tab provided in this application in a specific embodiment;

[0073] Figure 8 A schematic diagram of the structure of the first electrode tab in a specific embodiment provided in this application;

[0074] Figure 9AA cross-sectional view of the first electrode tab provided for this application in a specific embodiment;

[0075] Figure 9B A schematic diagram of the structure of the first electrode tab provided in this application in another specific embodiment;

[0076] Figure 9C for Figure 9B A sectional view;

[0077] Figure 9D A schematic diagram of the structure of the first electrode tab provided in this application in another specific embodiment;

[0078] Figure 9E for Figure 9D A sectional view;

[0079] Figure 10 A partially exploded structural diagram of the first electrode tab provided in this application in another specific embodiment;

[0080] Figure 11 A cross-sectional view of the first electrode tab provided in this application in another specific embodiment;

[0081] Figure 12 A schematic diagram of the structure of the metal layer of the first electrode provided in this application in another specific embodiment;

[0082] Figure 13 for Figure 11 Sectional view at point AA;

[0083] Figure 14 A partially exploded structural diagram of the first electrode tab provided in this application in another specific embodiment;

[0084] Figure 15 A partially exploded structural diagram of the first electrode tab provided in this application in another specific embodiment;

[0085] Figure 16 A schematic diagram of the structure of the first electrode provided in this application in another specific embodiment;

[0086] Figure 17 A cross-sectional view of the first electrode tab provided in this application in another specific embodiment;

[0087] Figure 18 A schematic diagram of the structure of the battery provided in this application in another specific embodiment;

[0088] Figure 19 A cross-sectional view of the first electrode tab provided in this application in another specific embodiment;

[0089] Figure 20A schematic diagram of the structure of the first electrode provided in this application in another specific embodiment;

[0090] Figure 21 A cross-sectional view of the second electrode tab provided in this application in a specific embodiment;

[0091] Figure 22 A schematic diagram of the structure of the second electrode provided in this application in a specific embodiment;

[0092] Figure 23 A schematic diagram of the structure of the battery provided in this application in another specific embodiment;

[0093] Figure 24 A flowchart illustrating the fabrication process of the battery provided in this application in one specific embodiment;

[0094] Figure 25 A schematic diagram of the structure of the battery cell body provided in this application in a specific embodiment;

[0095] Figure 26 A schematic diagram of the structure of the battery cell body provided in this application in another specific embodiment;

[0096] Figure 27 A schematic diagram showing the connection between the main body of the battery cell and the first electrode tab;

[0097] Figure 28 A schematic diagram of the structure of the battery cell body provided in this application in another specific embodiment;

[0098] Figure 29 A schematic diagram of the structure of the battery cell body provided in this application in another specific embodiment;

[0099] Figure 30 A partial structural schematic diagram of the battery provided in this application in another specific embodiment;

[0100] Figure 31 A partial structural schematic diagram of the battery provided in this application in another specific embodiment;

[0101] Figure 32 A partial structural schematic diagram of the battery provided in this application in another specific embodiment;

[0102] Figure 33 A partial structural schematic diagram of the battery provided in this application in another specific embodiment;

[0103] Figure 34 A schematic diagram of the structure of the battery provided in this application in another specific embodiment;

[0104] Figure 35A cross-sectional view of the tab provided in this application in another specific embodiment;

[0105] Figure 36 A schematic diagram of the structure of the battery provided in this application in a specific embodiment;

[0106] Figure 37 This is a schematic diagram of the structure of the battery provided in this application in a specific embodiment.

[0107] Figure label:

[0108] 10'-battery;

[0109] 1'-Battery cell body;

[0110] 2'-Earthrottle;

[0111] 3'-Adapter;

[0112] 31'-Adapter;

[0113] 32' - First electrical connection layer;

[0114] 33' - Second electrical connection layer;

[0115] 34' - Electrical isolation component;

[0116] 35' - Connecting part;

[0117] 10-cell battery;

[0118] 1-Battery cell body;

[0119] 11-Positive electrode plate;

[0120] 12-Negative electrode;

[0121] 13-Electrode connection area;

[0122] 14-Electrode;

[0123] 2-First pole ear;

[0124] 21-First Metal Layer

[0125] 211-First connecting part;

[0126] 211a - First connection terminal;

[0127] 212 - Second connecting part;

[0128] 212a - Second connection terminal;

[0129] 212b - Gap;

[0130] 212c - Through hole;

[0131] 212d - Exposed metal layer portion;

[0132] 213 - Third connecting part;

[0133] 214 - First Buffer Section;

[0134] 214a - Bending section;

[0135] 214b - First end;

[0136] 214c - Second end;

[0137] 22-Covering membrane layer;

[0138] 23 - First pad;

[0139] 24 - First seal;

[0140] 25 - Second seal;

[0141] 26 - Second pad;

[0142] 27-Positive electrode tab;

[0143] 28-Negative electrode tab;

[0144] 29-Reinforcing component;

[0145] 3-Second pole ear;

[0146] 31 - Second metal layer;

[0147] 311-Fourth connecting part;

[0148] 312 - Fifth connecting part;

[0149] 313 - Second Buffer Section;

[0150] 313a - Third end;

[0151] 313b - Fourth end;

[0152] 32 - Protective film layer;

[0153] 33 - Third pad;

[0154] 4-Cell casing;

[0155] 41-Aluminum-plastic film;

[0156] 42-Airbag;

[0157] 43-Top Seal;

[0158] 44-Side seal;

[0159] 45-Overlapping edges;

[0160] X - First direction;

[0161] Y - Second direction;

[0162] Z - Thickness direction.

[0163] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0164] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0165] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0166] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0167] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0168] As mobile devices such as smartphones carry more and more functions, people's demand for longer battery life is also increasing, leading to a stronger demand for high-capacity batteries. Traditional batteries typically consist of battery cells and a battery protection board. To improve the installation space for the battery cells, the battery protection board is usually moved into the motherboard, connecting the battery cells to the motherboard.

[0169] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a battery in one embodiment of the related art. For example... Figure 1As shown, in the related technology, the battery 10' includes a linear body 1', a tab 2', and an adapter 3'. The tab 2' is electrically connected to the head of the cell body 1', and the adapter 3' is electrically connected to the tab 2', so that the tab 2' is electrically connected to the main board through the adapter 3'.

[0170] Among them, such as Figure 1 As shown, the adapter device 3' typically includes an adapter piece 31', a first electrical connection layer 32', a second electrical connection layer 33', an electrical isolation layer 34', and a connecting portion 35'. The adapter piece 31' can be an electrical connector such as an adapter nickel strip, used for electrical connection between the tab 2' and the first electrical connection layer 32'. The first electrical connection layer 32' and the second electrical connection layer 33' can be flexible printed circuit boards (FPCs), and the first electrical connection layer 32' and the second electrical connection layer 33' are electrically connected. The second electrical connection layer 33' is provided with a connecting portion 35', which is used for electrical connection with the motherboard. The electrical isolation layer 34' is disposed between the first electrical connection layer 32' and the second electrical connection layer 33' to improve circuit stability.

[0171] Therefore, it can be seen that, Figure 1 As shown, in related technologies, to ensure reliable connection, the adapter device 3' typically has many components, a complex structure, and a large volume. It occupies a significant amount of space at the head of the cell body 1' within the battery 10', which is detrimental to improving battery energy density. Furthermore, the positional tolerances generated during the assembly of the components in the tab 2' and adapter device 3' are transmitted to the connecting part 35'. Since the connecting part 35' has limited mobility within space via the second electrical connection layer 33', the positional tolerance between the connecting part 35' and the corresponding connection point on the motherboard can easily become too large. Therefore, if the second connection layer 33' is too short, it will be difficult for the connecting part 35' to match and connect with the motherboard, and it will reduce the reliability of the connection between the connecting part 35' and the motherboard. If the second connection layer 33' is too long, it will further increase the space occupied by the adapter device 3'.

[0172] In view of this, embodiments of this application provide a battery that can be applied to electronic devices. These electronic devices can be mobile phones, tablets, desktop computers, laptops, handheld computers, notebook computers, ultra-mobile personal computers (UMPCs), netbooks, as well as cellular phones, personal digital assistants (PDAs), augmented reality (AR) devices, virtual reality (VR) devices, artificial intelligence (AI) devices, wearable devices, in-vehicle devices, smart home devices, smart city devices, and other electronic products. Embodiments of this application do not impose any special limitations on the specific type of electronic device.

[0173] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0174] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the battery provided in this application in a specific embodiment. For ease of understanding, the battery 10 has a length direction, a width direction, and a thickness direction Z, wherein the length direction of the battery 10 is defined as the first direction X, and the width direction of the battery 10 is defined as the second direction Y.

[0175] like Figure 2 As shown, the battery 10 includes a cell body 1 and a first tab 2, which is electrically connected to the head of the cell body 1. The first tab 2 may be provided with a first solder pad 23, through which the first tab 2 is electrically connected to an external device of the electronic device. The external device may be a circuit board structure such as a motherboard or sub-board, or other electronic components; no limitation is made here.

[0176] The first tab 2 can be a flexible printed circuit board (FPC) or a rigid-flex PCB, etc. For example, in the embodiments of this application, the first tab 2 can be a flexible printed circuit board (FPC), which has good flexibility and is easy to bend and connect.

[0177] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of the metal layer of the first tab provided in this application in a specific embodiment.

[0178] like Figure 3As shown, the first tab 2 includes a metal layer 21, which has an elastic deformation capability. The metal layer 21 includes a first connecting portion 211, a first buffer portion 214, and a second connecting portion 212. The first buffer portion 214 includes a first end 214b and a second end 214c. The first connecting portion 211 is connected to the first end 214b, and the second connecting portion 212 is connected to the second end 214c.

[0179] Wherein, the trace length between the first end 214b and the second end 214c is greater than the straight-line distance between the first end 214b and the second end 214c, that is... Figure 3 The path length of the current transmitted from the first end 214b to the second end 214c, as shown by the dashed line, is greater than the straight-line distance between the first end 214b and the second end 214c. This gives the first buffer section 214 a certain redundant length in the first direction X and the second direction Y, so that the first buffer section 214 can undergo adaptive deformation in space under the action of external force.

[0180] Please refer to Figure 4 , Figure 4 A top view of the battery provided in this application in one specific embodiment.

[0181] like Figure 4 As shown, the first connecting part 211 is electrically connected to the battery cell body 1, and the second connecting part 212 is used to connect to external devices of the electronic device. The second connecting part 212 can be displaced relative to the first connecting part 211 by the deformation of the first buffer part 214.

[0182] The battery body 1 of the battery 10 can be a wound core structure or a stacked structure. The battery body 1 includes a positive electrode and a negative electrode. The metal layer 21 inside the first electrode tab 2 can be made of copper, nickel-plated copper, nickel, or aluminum, depending on the polarity of the battery body 1 to which it is connected. For example, when the first electrode tab 2 is a positive electrode tab, the metal layer 21 can be aluminum foil. For example, when the first electrode tab 2 is a negative electrode tab, the metal layer 21 can be copper foil or nickel-plated copper foil.

[0183] In this embodiment, as Figure 3 and Figure 4As shown, the cell body 1 is directly connected to the first connecting part 211 of the first tab 2, and is electrically connected to the external device of the electronic device directly through the second connecting part 212 of the first tab 2. This structure is simple and small in size, which can reduce the space occupied by the cell body 1 in the battery 10, thereby helping to increase the volume of the cell body 1 and improve the energy density of the battery. At the same time, since the trace length between the first end 214b and the second end 214c is greater than the straight distance between the first end 214b and the second end 214c, the first buffer part 214 has a certain redundant length in the first direction X and the second direction Y. This allows the first buffer part 214 to undergo adaptive deformation in space under the action of external force, and the second connecting part 212 can be displaced in space relative to the first connecting part 211 through the deformation of the first buffer part 214. This allows the second connecting part 212 to absorb the positional tolerance between the first connecting part 211 and the cell body 1, thereby making it easier for the second connecting part 212 to achieve a matching connection with the external device. In addition, the first buffer part 214 can also play a buffering role in the process of connecting the first tab 2 with the external device, absorbing part of the pulling force, thereby improving the connection reliability between the first connection part 211 and the battery cell body 1, and between the second connection part 212 and the external device, that is, improving the connection reliability between the battery cell body 1, the first tab 2 and the external device.

[0184] like Figure 4 As shown, a first solder pad 23 may be provided on the second connection part 212, thereby further improving the connection reliability between the first electrode 2 and the external device. Of course, the second connection part 212 can also be electrically connected to the external device in other ways, which is not limited here.

[0185] Please refer to Figure 5 , Figure 5 A top view of the metal layer of the first tab in one specific embodiment is provided for the purposes of this application.

[0186] like Figure 5 As shown, the trace between the first end 214b and the second end 214c of the first buffer portion 214 is one or more combinations of arc or polygonal shape, thereby enabling the second connection portion 212 to move in any direction in space through the first buffer portion 214. For example, the second connection portion 212 can be displaced in the direction of the first direction X, the second direction Y, the thickness direction Z, or the resultant force direction of any two directions through the first buffer portion 214. Moreover, this structure can increase the redundant length of the first buffer portion 214 without further increasing the space occupied by the first buffer portion 214 in the first direction X, thereby increasing the moving distance of the second connection portion 213 relative to the first connection portion 211, making it easier for the second connection portion 212 to achieve matching connection with external devices.

[0187] For example, such as Figure 5 As shown, the first buffer section 214 may include multiple bent segments 214a connected in sequence. The multiple bent segments 214a connected in sequence can form various shapes such as S-shape, Z-shape, W-shape, paperclip shape, and thread shape. Thus, the first buffer section 214 can form one or more combinations of various shapes such as S-shape, Z-shape, W-shape, paperclip shape, and thread shape. The structure is simple, easy to manufacture and mold, conducive to mass production, and can improve the design freedom of the first electrode 2. The specific design can be made according to actual needs, and no restrictions are imposed here.

[0188] like Figure 5 As shown, along the second direction Y of the battery 10, the width of the bent section 214a is less than or equal to the width of the first connecting part 211 and the second connecting part 212, thereby further reducing the space occupied by the first buffer part 214 in the second direction Y, which is beneficial to the miniaturization design of the first tab 2.

[0189] Further, please refer to Figure 6 , Figure 6 The present application provides a side view of the metal layer of the first tab in one specific embodiment.

[0190] like Figure 6 As shown, along the thickness direction Z of the battery 10, the thickness of the first buffer portion 214 is greater than or equal to the thickness of the first connecting portion 211 and the second connecting portion 212, thereby increasing the cross-sectional area of ​​the first buffer portion 214 and thus improving the current flow rate of the first buffer portion 214 and the current flow effect of the first tab 2.

[0191] Among them, such as Figure 6 As shown, the thicknesses of the first connecting portion 211 and the second connecting portion 212 can be designed to be the same to reduce manufacturing difficulty. The thickness of the first buffer portion 214 can be 1 to 2 times the thicknesses of the first connecting portion 211 and the second connecting portion 212. For example, the thickness of the first buffer portion 214 can be 1, 1.2, 1.4, 1.5, 1.6, 1.8, or 2 times the thicknesses of the first connecting portion 211 and the second connecting portion 212. Of course, the thicknesses of the first connecting portion 211 and the second connecting portion 212 can also be different, or the thickness of the first buffer portion 214 can be other values ​​within the above range. The specific design can be carried out according to actual design requirements, and no restrictions are imposed here.

[0192] In addition, such as Figure 6As shown, the thickness of the first buffer portion 214 can be made greater than or equal to the thickness of the first connecting portion 211 and the second connecting portion 212 by performing local electroplating on the first buffer portion 214 or by thinning the first connecting portion 211 and the second connecting portion 212. Of course, the thickness of the first buffer portion 214 can also be made greater than or equal to the thickness of the first connecting portion 211 and the second connecting portion 212 by other means. The specific design can be made according to actual needs and is not limited here.

[0193] Please refer to Figure 7 , Figure 7 An exploded schematic diagram of the first electrode tab provided in this application in one specific embodiment. (See diagram below.) Figure 7 As shown, the first tab 2 also includes a cover film layer 22, a first pad 23, and a reinforcing member 29.

[0194] Please refer to Figure 8 , Figure 8 A schematic diagram of the structure of the first electrode in a specific embodiment provided in this application.

[0195] like Figure 8 As shown, the cover film 22 is an insulating film layer. The cover film 22 covers at least a portion of the metal layer 21, which can protect the metal layer 21, prevent the metal layer 21 from being damaged by oxidation and corrosion, and ensure the long-term stability of the conductivity of the metal layer 21.

[0196] The covering film 22 can be made of polypropylene (PP), polyimide (PI), or nylon, giving it high strength, high temperature resistance, corrosion resistance, shear resistance, and other properties. This effectively protects the first tab 2 from corrosion by the battery electrolyte, external vibration, and excessive stress, thus improving its safety and reliability. Of course, the covering film 22 can also be made of other insulating materials such as rubber; the specific design can be tailored to actual needs and is not limited here.

[0197] like Figure 8 As shown, along the thickness direction Z of the battery 10, the first pad 23 passes through the cover film layer 22 and is electrically connected to the second connection portion 212. The second connection portion 212 is electrically connected to external devices through the first pad 23, thereby improving the connection reliability between the first tab 2 and the external devices. The first pad 23 can be a board-to-board (BTB) connector pad, further enhancing the connection reliability between the first tab 2 and the external devices.

[0198] Of course, the second connection part 212 can also be connected to the external device in other ways. For example, the second connection part 212 can also be provided with other electrical connection components such as metal springs for electrical connection with the external device. The specific design can be made according to actual needs, and no restrictions are imposed here.

[0199] like Figure 8 As shown, along the thickness direction of the battery 10, the reinforcing member 29 can also be disposed on the side of the cover film layer 22 away from the first solder pad 23, thereby improving the rigidity of the connection between the first tab 2 and the external device, thereby preventing the first tab 2 from being damaged by force, and further improving the safety and reliability of the first tab 2.

[0200] Please refer to the following at the same time Figure 9A , Figure 9A A cross-sectional view of the first electrode tab provided in this application in a specific embodiment. (See figure) Figure 8 and Figure 9A As shown, at least a portion of the first connecting portion 211 is exposed in the covering film layer 22 to form a first connecting end 211a, which is electrically connected to the battery cell body 1. At least a portion of the second connecting portion 212 is exposed in the covering film layer 22 to form a second connecting end 212a.

[0201] like Figure 8 and 9A As shown, the surface of the first connecting end 211a located on the first connecting portion 211 is not covered by the film layer 22, thereby facilitating the electrical connection between the first tab 2 and the cell body 1 and improving the battery manufacturing efficiency. The first connecting end 211a can be exposed on the film layer 22 along the first direction X of the battery 10, or it can be exposed on the film layer 22 in other directions to further enhance design freedom. The specific design can be configured according to actual needs and is not limited here.

[0202] like Figure 8 and Figure 9A As shown, the second connection end 212a provided in the second connection part 212 can be connected to the formation fixture during the formation process of the battery 10. That is, during the battery production process, an electrical connection can be established with the cell body 1 through the second connection end 212 to perform battery formation, thereby further simplifying the manufacturing process. Since battery formation does not need to be performed through the first solder pad 23, the first solder pad 23 can be avoided from being damaged during the production process of the battery 10, thereby improving the connection reliability between the first tab 2 and the external device.

[0203] For example, such as Figure 9A As shown, the second connection end 212a can be at least partially exposed in the cover film layer 22 along the first direction X to reduce the complexity of the structure and facilitate the production and preparation of the first electrode 2.

[0204] For example, please refer to Figure 9B and Figure 9C , Figure 9B A schematic diagram of the structure of the first electrode tab in another specific embodiment provided in this application. Figure 9C for Figure 9B A sectional view. For example... Figure 9B and Figure 9C As shown, the second connection end 212a is at least partially exposed in the cover film layer 22 along the first direction X. At this time, the second connection part 212 can be provided with a protrusion along the second direction Y. The first pad 23 can be set at the protrusion position to further improve the design freedom of the tab 2.

[0205] For example, please refer to Figure 9D and Figure 9E , Figure 9D A schematic diagram of the structure of the first electrode tab in another specific embodiment provided in this application. Figure 9E for Figure 9D A sectional view. For example... Figure 9D and Figure 9E As shown, the second connecting end 212a can also be exposed at least partially in the cover film layer 22 along the second direction Y, so as to further improve the design freedom of the first electrode tab 2 and facilitate the connection of the second connecting end 212a with the formation fixture.

[0206] Of course, the second connection end 212a can also be exposed at least partially in other directions beyond the cover film layer 22, as long as the connection between the second connection end 212a and the formation fixture can be achieved. The first pad 23 can also be located in other positions of the second connection portion 212, as long as the electrical connection between the first pad 23 and the external device can be achieved. The specific settings can be made according to actual needs and are not limited here. It should be noted that the above "end" refers to the two ends of a structure that are far apart from each other in a certain preset direction. That is, "first binding end" and "second binding end" are relative concepts of one end and the other end, and do not refer only to the "end face (i.e., sidewall)" of a structure. For example, the first connection end 211a of the first connection portion 211 is the part of the first connection portion 211 exposed beyond the cover film layer 22, which is used for electrical connection with the cell body 1; the second connection end 212a of the second connection portion 212 is the part of the second connection portion 212 exposed beyond the cover film layer 22, which is used for connection with the formation fixture during the battery formation process, that is, for establishing an electrical connection with the cell body 1 during the battery production process. Additionally, it should be understood that "end" refers to a region of length located at both ends of the structure, including the end faces, and does not limit its distance from the end faces.

[0207] Please refer to Figure 10 , Figure 10 This is a partial structural exploded view of the first electrode provided in this application in another specific embodiment.

[0208] like Figure 10As shown, in one specific embodiment, the first tab 2 further includes a first sealing member 24, which is disposed on the side of the covering film layer 22 near the second connecting end 212a, for sealing the second connecting end 212a.

[0209] The first sealing element 24 is formed by curing materials such as adhesive or UV adhesive. Of course, the first sealing element 24 can also be made of other insulating materials, and the specific choice can be made according to actual needs, without any restrictions here.

[0210] Please refer to Figure 11 , Figure 11 A cross-sectional view of the first electrode provided for this application in another specific embodiment.

[0211] like Figure 11 As shown, the first seal 24 protects the second connection end 212a from damage due to oxidation and corrosion, and also prevents short circuits at the second connection end 212a, further improving the safety and reliability of the first tab 2. Simultaneously, the first seal 24 can be tightly connected to at least a portion of the covering film 22 at the second connection end 212a, thereby preventing delamination of the covering film 22 at the second connection end 212a during battery production and improving the structural stability of the first tab 2.

[0212] Further, please refer to Figure 12 , Figure 12 A schematic diagram of the structure of the metal layer of the first tab provided in this application in another specific embodiment.

[0213] like Figure 12 As shown, in one specific embodiment, the second connecting end 212a is provided with a notch 212b, which penetrates the metal layer 2 located at the first connecting end 212a along the side away from the first buffer portion 214. The number of notches 212b can be one or more, for example, one, two, three, four, five, etc., and the shape of the notches 212b can be rectangular, semi-circular, triangular, or other structures, depending on actual needs and is not limited here.

[0214] Furthermore, the metal layer 21 can be an integrally formed structure, which makes the transition at the connection of each part of the metal layer 21 smoother, which is conducive to current flow and facilitates the mass production of the metal layer 21, saving preparation costs and improving preparation efficiency.

[0215] Please refer to Figure 13 , Figure 13 for Figure 11 Sectional view of the cross section at point AA.

[0216] like Figure 13As shown, at least a portion of the cover film 22 is disposed at the notch 212b along the thickness direction Z of the battery 10. In this structure, the cover film 22 at the notch 212b is interconnected in the thickness direction Z, thereby further preventing the cover film 22 from delaminating from the metal layer 21 during the production of the battery 10.

[0217] Please refer to the following at the same time Figure 14 , Figure 14 This is a partial structural exploded view of the first electrode provided in this application in another specific embodiment.

[0218] like Figure 14 As shown, the covering film layers 22 at the notch 212b are interconnected in the thickness direction Z, which can also increase the cross-sectional area of ​​the covering film layer 211 at the second connection end 212a, increase the contact area between the covering film layer 22 and the first seal 24, thereby increasing the connection strength between the first seal 24 and the covering film layer 22, thereby further improving the structural stability of the first electrode 2 and ensuring the safety and reliability of the first electrode 2.

[0219] It should be noted that the first seal 24 can be formed during the manufacturing process of the battery 10 or during the manufacturing process of the electronic device. The specific configuration can be determined according to actual needs and is not limited here.

[0220] Please refer to Figure 15 , Figure 15 This is a partial structural exploded view of the first electrode provided in this application in another specific embodiment.

[0221] like Figure 15 As shown, in one specific embodiment, the first tab 2 further includes a second sealing member 25, which is disposed on the side of the covering film layer 22 near the first connecting end 211a, and the first connecting portion 211 passes through the second sealing member 25.

[0222] Please refer to Figure 16 , Figure 16 A schematic diagram of the structure of the first electrode provided in this application in another specific embodiment.

[0223] like Figure 16 As shown, the second seal 25 is used to block the opening of the cover film 22 and can prevent the electrolyte in the battery from contacting the cover film 22 and corroding the cover film.

[0224] The second seal 25 can be made of polypropylene (PP), polyimide (PI), or nylon, giving it high strength, high temperature resistance, corrosion resistance, shear resistance, and other characteristics. This effectively protects the first tab 2 from corrosion by the battery electrolyte, external vibration, and excessive stress, thus improving its safety and reliability. Of course, the second seal 25 can also be made of other corrosion-resistant materials; the specific design can be tailored to actual needs and is not limited here.

[0225] Please refer to Figure 17 , Figure 17 A cross-sectional view of the first electrode provided for this application in another specific embodiment.

[0226] like Figure 17 As shown, in one specific embodiment, at least a portion of the second seal 25 covers the outer surface of the cover film 22, so that at least a portion of the cover film 22 can be located between the second seal 25 and the first connection portion 211, thereby further reducing the risk of direct contact between the cover film 22 and the electrolyte and improving the safety and reliability of the first tab 2.

[0227] In the above embodiments, the battery 10 can be a bipolar structure or a multipolar structure, and the specific design can be made according to actual needs, without limitation.

[0228] In one specific embodiment, the battery 10 can be a bipolar structure, that is, the battery includes two first tabs 2, namely a positive tab and a negative tab. The positive tab is connected to the positive electrode of the cell body 1, and the negative tab is connected to the negative electrode of the cell body 1. The structure is simple and easy to manufacture.

[0229] In another specific embodiment, the battery 10 can be a multi-tab structure. The multi-tab structure can significantly reduce the internal resistance of the battery, enabling the battery to conduct current better during high-rate discharge and improving the charging and discharging performance of the battery 10.

[0230] Please refer to Figure 18 , Figure 18 This is a schematic diagram of the structure of the battery provided in this application in another specific embodiment.

[0231] like Figure 18As shown, in the multi-tab structure, the first tab 2 includes a positive tab 27 and a negative tab 28, as well as at least one second tab 3. The second tab 3 is electrically connected to the cell body 1 and to either the positive tab 27 or the negative tab 28, thereby realizing the multi-tab structure of the battery 10. The second tab 3 can be centrally connected to either the positive tab 27 or the negative tab 28, thereby reducing battery impedance and improving current conduction.

[0232] The number of second electrodes 3 can be multiple. For example, such as... Figure 18 As shown, when there is one second tab 3, the battery 10 has a three-tab structure, wherein the second tab 3 is connected to the negative tab 28. For example, when there are two second tabs 3, the battery 10 has a four-tab structure, etc. The number of second tabs 3 can be specifically set according to actual needs and is not limited here.

[0233] Please refer to the following at the same time Figure 19 , Figure 19 A cross-sectional view of the first electrode provided for this application in another specific embodiment.

[0234] like Figure 18 and Figure 19 As shown, in the multi-tab battery structure, when the first tab 2 is connected to the second tab 3, the metal layer 21 of the first tab 2 connected to the second tab 3 may also include a third connecting part 213. The third connecting part 213 is connected to the first buffer part 214 and extends along the second direction Y of the battery 10. The third connecting part 213 is electrically connected to the second tab 3.

[0235] like Figure 19 As shown, in this embodiment, the third connecting part 213 extends along the second direction Y and is connected to the first buffer part 214, so that the third connecting part 214 can generate a certain displacement in space relative to the first connecting part 211 through the first buffer part 214, thereby facilitating the connection between the third connecting part 214 and the second electrode 3. The first buffer part 214 has a certain buffering effect and can absorb part of the tensile force, thereby improving the connection reliability between the third connecting part 214 and the second electrode 3.

[0236] Among them, such as Figure 19 As shown, the covering film 22 also covers the third connection portion 213 to protect the metal layer 21, prevent the metal layer 21 from being damaged by oxygen, and ensure the long-term stability of the conductivity of the metal layer 21.

[0237] In addition, such as Figure 19As shown, the thickness of the third connecting portion 213 in the thickness direction Z can be greater than or equal to the thickness of the first connecting portion 211 and the second connecting portion 212. That is, the thickness of the third connecting portion 213 can be designed to be the same as that of the first buffer portion 214 to further improve the current flow effect at the third connecting portion 213. Specifically, the thickness can be increased in the same way as the first buffer portion 214, which will not be described in detail here.

[0238] Please refer to Figure 20 , Figure 20 A schematic diagram of the structure of the first electrode provided in this application in another specific embodiment.

[0239] like Figure 20 As shown, the third connecting part 213 is provided with a second solder pad 26. The third connecting part 213 is soldered to the second electrode 3 through the second solder pad 26, thereby further improving the connection reliability between the first electrode 2 and the second electrode 3.

[0240] The second pad 20 is electrically connected to the third connection portion 213 through the cover film layer 22.

[0241] Further, please refer to Figure 21 , Figure 21 A cross-sectional view of the second electrode provided in this application in one specific embodiment.

[0242] like Figure 21 As shown, the second electrode 3 includes a second metal layer 31, which has an elastic deformation capability. The second metal layer 31 includes a fourth connecting portion 311, a second buffer portion 313, and a fifth connecting portion 312. The second buffer portion 313 is connected between the fourth connecting portion 311 and the fifth connecting portion 312. The fourth connecting portion 31 is connected to the battery cell body 1. The fifth connecting portion 32 extends along the second direction Y and is used for electrical connection with the first electrode 2.

[0243] The second buffer section 313 includes a third end 313a and a fourth end 313b. A fourth connecting part 311 is connected to the third end 313a, and a fifth connecting part 312 is connected to the fourth end 313b. The trace length between the third end 313a and the fourth end 313b is greater than the straight-line distance between the third end 313a and the fourth end 313b. That is, the length of the path from the third end 313a to the fourth end 313b is greater than the straight-line distance between the third end 313a and the fourth end 313b. This gives the second buffer section 3113 a certain redundant length in the first direction X and the second direction Y, so that the second buffer section 313 can undergo adaptive deformation in space under the action of external force.

[0244] like Figure 21As shown, since the trace length between the third end 313a and the fourth end 313b is greater than the straight-line distance between the third end 313a and the fourth end 313b, the second buffer part 3113 has a certain redundant length in the first direction X and the second direction Y. This allows the second buffer part 313 to undergo adaptive deformation in space under the action of external force, thereby enabling the fifth connecting part 312 to be displaced in space relative to the fourth connecting part 311 through the deformation of the second buffer part 313. This facilitates the connection between the fifth connecting part 312 and the first electrode 2. Furthermore, the second buffer part 313 has a certain buffering effect and can absorb part of the tensile force, thereby further improving the connection reliability between the second electrode 3 and the first electrode 2.

[0245] The second buffer section 313 can be formed by connecting multiple bent sections in sequence. The second buffer section 313 can be one or more combinations of U-shaped, S-shaped, Z-shaped and other structures, so that the second buffer section 313 can have a longer redundant length, thereby having better buffering performance and increasing the movement distance of the fifth connecting section 312 in space.

[0246] In addition, such as Figure 21 As shown, the thickness of the second buffer portion 313 and the fifth connecting portion 312 in the thickness direction Z can be greater than or equal to the thickness of the fourth connecting portion 311, thereby improving the current-carrying effect of the second electrode 3. Furthermore, the above structure can be formed by locally electroplating the second buffer portion 313 and the fourth and fifth connecting portions 312, or by grinding and thinning a portion of the fourth connecting portion 311, or by other methods, which are not limited here.

[0247] Furthermore, the second metal layer 31 can be an integrally formed structure to further reduce manufacturing costs and improve manufacturing efficiency. Specifically, depending on the polarity of the battery cell body 1 to which it is connected, the material of the second metal layer 31 can be copper, nickel-plated copper, nickel, or aluminum. For example, when the second electrode 3 is a positive electrode, the second metal layer 31 can be aluminum foil. For example, when the second electrode 3 is a negative electrode, the second metal layer 31 can be copper foil or nickel-plated copper foil.

[0248] In addition, such as Figure 21 As shown, the second tab 3 also includes a protective film layer 32. The protective film layer 32 can be made of the same material as the covering film layer 22, or it can be made of other insulating materials. The specific material can be set according to actual needs and is not limited here. The protective film layer 22 covers at least a portion of the fifth connecting portion 312, the second buffer portion 313, and the fourth connecting portion 311 to protect the metal layer 21 and prevent the metal layer 21 from being damaged by oxidation and corrosion, thus ensuring the long-term stability of the conductivity of the metal layer 21.

[0249] Please refer to Figure 22 , Figure 22 A schematic diagram of the structure of the second electrode provided in this application in a specific embodiment.

[0250] like Figure 22 As shown, the fifth connection part 312 is provided with a third solder pad 33, which is electrically connected to the second solder pad 26 on the first electrode 2, thereby further improving the connection reliability between the first electrode 2 and the second electrode 3.

[0251] The third pad 33 is electrically connected to the fifth connection portion 312 through the protective film layer 32.

[0252] In the above embodiments, the second pad 26 and the third pad 33 can be board-to-board (BTB) pads, which can further improve the connection reliability between the first tab 2 and the second tab 3.

[0253] In addition, the length of the third connecting portion 213 and the fifth connecting portion 312 extending along the second direction Y in the first electrode 2 and the second electrode 3 can be set according to actual needs.

[0254] Please refer to Figure 23 , Figure 23 A schematic diagram of the structure of the battery provided in this application in another specific embodiment. (See diagram below.) Figure 23 As shown, in this three-tab battery 10, the second tab 3 is electrically connected to the positive tab 27 of the first tab 2. The distance between the second tab 3 and the positive tab 27 on the cell body 1 is relatively large. Therefore, the fifth connecting portion 312 on the second tab 3 can be designed to be larger in the second direction Y, facilitating a matching connection between the fifth connecting portion 312 and the third connecting portion 213 of the positive tab 27. The negative tab 28 in the first tab 2 does not need to be connected to the second tab 3, therefore the negative tab 28 does not need to have a third connecting portion 213.

[0255] This application also provides a method for preparing a battery, used to prepare the battery 10 in the above embodiments.

[0256] Please refer to Figure 24 , Figure 24 A flowchart illustrating the fabrication process of the battery provided in this application in one specific embodiment. Figure 24 As shown, the method for preparing battery 10 includes the following steps:

[0257] S1, preparing the electrode sheet of the battery cell body 1.

[0258] In this step, battery 10 can be a wound cell battery or a stacked cell battery. Please refer to... Figure 25 and Figure 26 , Figure 25 This is a schematic diagram of the structure of the battery cell body provided in this application in a specific embodiment. Figure 26 This is a schematic diagram of the structure of the battery provided in this application in another specific embodiment. Exemplarily, as shown... Figure 25 As shown, when the battery 10 is a stacked battery, the cell body 1 includes multiple stacked electrode sheets 14, each electrode sheet 14 including a positive electrode sheet and a negative electrode sheet. For example, as... Figure 26 As shown, when the battery 10 is a wound cell battery, the electrode plates of the cell body 1 include a positive electrode plate 11 and a negative electrode plate 12.

[0259] S2, prepare the first tab 2 to form the first connecting part 211, the first buffer part 214 and the second connecting part 212.

[0260] In this step, please refer to Figure 27 , Figure 27 This is a schematic diagram showing the connection between the main body 1 of the battery cell and the first electrode. (See diagram below.) Figure 27 As shown, the first connecting part 211 is used for electrical connection with the electrode core body 1 during the battery 10 manufacturing process, and the second connecting part 212 is used for establishing an electrical connection with the cell body 1 during the battery formation process. Simultaneously, the second connecting part 212 may be provided with a first solder pad 23 for electrical connection with external devices of electronic equipment. The second connecting part 212 can be displaced relative to the first connecting part 211 via the first buffer part 214.

[0261] S3, the first connecting part 211 is electrically connected to the electrode plate of the cell body 1.

[0262] In this step, the first connecting part 211 can be electrically connected to the electrode of the battery cell body 1 by welding methods such as ultrasonic welding and laser welding, and no restrictions are imposed here.

[0263] Taking a bipolar battery as an example, such as Figure 26 As shown, in one specific embodiment, the battery 10 is a wound cell battery, formed by winding a positive electrode sheet 11 and a negative electrode sheet 12 to form the cell body 1. The first connecting portion 211 of the positive electrode tab 27 of the two first tabs 2 can be ultrasonically welded to the tab connecting area 13 on the positive electrode sheet 11, and the first connecting portion 211 of the negative electrode tab 28 can be ultrasonically welded to the tab connecting area 13 on the negative electrode sheet 12.

[0264] For example, such as Figure 26 As shown, the tab connection region 12 on the positive electrode 11 and the negative electrode 12 can be disposed in the middle region between the positive electrode 11 and the negative electrode 12. For example, please refer to... Figure 28 , Figure 28 A schematic diagram of the structure of the battery cell body provided in this application in another specific embodiment is shown below. Figure 28 As shown, the tab connection area 13 on the positive electrode 11 and the negative electrode 12 can also be located at the end regions of the positive electrode 11 and the negative electrode 12. Of course, the cell body 1 of the wound battery can also have other structures, which can be designed according to actual needs and are not limited here.

[0265] Alternatively, the battery 10 can also be a multi-tab structure. In addition to the two first tabs 2, the multi-tab structure also requires a second tab 3 to be connected to the cell body 1.

[0266] Taking a three-tab structure wound battery as an example, please refer to... Figure 29 , Figure 29 A schematic diagram of the battery cell body provided in this application in another specific embodiment. (See diagram below.) Figure 29 In the specific embodiment shown, a first tab, namely a positive tab 27, is connected to the positive electrode 11, and a first tab, namely a negative tab 28, is connected to the negative electrode 12. Simultaneously, a second tab 3 is connected in parallel to the negative electrode 12. The first connecting portion 211 of the positive tab 27 is welded to the tab connection area 13 of the positive electrode 11, and the first connecting portion 211 of the negative tab 28 is welded to the tab connection area 13 of the negative electrode 12. The fourth connecting portion 311 of the second tab 3 is welded in parallel to the tab connection areas on other layers of the negative electrode 12. Furthermore, in this structure, the second tab 3 may be provided with a fifth connecting portion 312, and the negative tab 28 connected to it may be provided with a third connecting portion 213, thereby enabling the positive electrode 11 and the negative electrode 12 to be wound together to form a... Figure 18 After the battery with the three tab structure shown, the fifth connecting part 312 and the third connecting part 213 can be welded together, so that the second tab 3 can be transferred to the negative tab 28.

[0267] Of course, batteries can also have other multi-tab structures, such as four-tab or five-tab structures, with the connection method being the same as that of three-tab structures, and there are no restrictions here.

[0268] In another specific embodiment, such as Figure 25 As shown, when the battery 10 is a stacked battery, it is formed by stacking multiple electrode sheets 14 to form the cell body 1. Among them, the first electrode tab 2 is connected to one of the positive or negative electrode sheets 14 to form a positive or negative electrode tab, and the remaining positive or negative electrode sheets 14 can be connected to the corresponding first electrode tab 2.

[0269] S4, such as Figure 27 As shown, the electrode sheet connected to the first tab 2 forms the main body 1 of the battery cell.

[0270] In this step, the electrode sheet connected to the first tab 2 can be formed into the main body 1 of the battery cell by winding or stacking. The specific method can be set according to actual needs and is not limited here.

[0271] The battery 10 may also include a battery casing. The battery casing is typically made of aluminum-plastic film. Please refer to... Figure 30 and Figure 31 , Figure 30 A partial structural schematic diagram of the battery provided in this application in another specific embodiment; Figure 31 A partial structural diagram of the battery provided in this application in another specific embodiment. (See diagram below.) Figure 30 As shown, during the manufacturing process of battery 10, the cell body 1 connected to the first tab 2 can be placed in the aluminum-plastic film 41, and the aluminum-plastic film 41 can be folded upward along the dotted line so that the aluminum-plastic film 41 can protect the cell body 1 and at least part of the first tab 2. Figure 31 As shown, the side opening and top opening of the folded aluminum-plastic film 41 away from the airbag are sealed to form a side seal 44 and a top seal 43.

[0272] S5, battery 10 formation.

[0273] In this step, the formation equipment and the cell body 1 can be electrically connected through the second connecting part 2 to achieve the formation of the battery.

[0274] Please refer to Figure 32 , Figure 32 A partial structural diagram of the battery provided in this application in another specific embodiment. (See diagram below.) Figure 32 As shown, the battery 10 can be formed through the exposed metal layer portion 212d of the second connection end 212a of the second connection portion 212. The exposed metal layer portion 212d can be connected to the formation fixture, thereby establishing an electrical connection between the formation equipment and the cell body 1 for battery formation. This further simplifies the manufacturing process. Furthermore, since battery formation does not require the first solder pad 23, damage to the first solder pad 23 during battery 10 production can be avoided, thus improving the reliability of the connection between the first tab 2 and external devices.

[0275] Among them, such as Figure 32 As shown, after battery formation, the aluminum-plastic film 41 can be further sealed along the dotted line in the figure to remove the airbag 42.

[0276] S6, punching the first buffer section 214.

[0277] In this step, please refer to Figure 33 , Figure 33 A partial structural diagram of the battery provided in this application in another specific embodiment. (See diagram below.) Figure 33As shown, the first buffer portion 214 is punched so that the second connecting portion 212 can be displaced relative to the first connecting portion 211 through the first buffer portion 214. Specifically, punching the first buffer portion 214 can be performed after the outer casing 4 of the cell body 1 is formed. This prevents the first buffer portion 214 from maintaining stability between its various bending segments during battery manufacturing, thus avoiding excessive stretching and damage, and ensuring the structural stability of the first buffer portion 214.

[0278] Specifically, please refer to Figure 34 , Figure 34 A schematic diagram of the structure of the battery provided in this application in another specific embodiment. (See diagram below.) Figure 34 As shown, the side seals on both sides of the aluminum-plastic film can be folded to form overlapping edges 45, and then the top seal 43 can be bent and fixed by applying adhesive or glue, thereby forming a shape as shown. Figure 33 The battery cell casing 4 is shown.

[0279] In this embodiment, as Figure 33 As shown, the cell body 1 is directly connected to the first connecting portion 211 of the first tab 2, and is electrically connected to the external device of the electronic device directly through the second connecting portion 212 of the first tab 2. This structure is simple and small in size, which can reduce the space occupied by the cell body 1 at the head of the cell body 1 within the battery 10, thereby helping to increase the volume of the cell body 1 and improve the energy density of the battery. At the same time, the second connecting portion 212 can be displaced in space relative to the first connecting portion 211 by the deformation of the first buffer portion 214, so that the second connecting portion 212 can absorb the positional tolerance between the first connecting portion 211 and the cell body 1, making it easier for the second connecting portion 212 to be matched and connected with the external device. In addition, the first buffer portion 214 can also play a buffering role during the connection between the first tab 2 and the external device, absorbing part of the tensile force, thereby improving the connection reliability between the first connecting portion 211 and the cell body 1, and between the second connecting portion 212 and the external device.

[0280] Please refer to Figure 35 , Figure 35 A cross-sectional view of the tab provided in this application in another specific embodiment.

[0281] In one specific embodiment, the first tab 2 is fabricated to form a first connecting portion 211, a first buffer portion 214, and a second connecting portion 212, specifically including:

[0282] S21, as Figure 35 As shown, a metal layer 2 is prepared to form a first connecting portion 211, a first buffer portion 214, and a second connecting portion 212.

[0283] In this step, the first buffer section 214 includes a plurality of sequentially connected bent segments 214a, which enables the second connecting section 212 to move in any direction in space through the first buffer section 214. For example, the second connecting section 212 can be displaced in the direction of the first direction X, the second direction Y, the thickness direction Z, or the resultant force direction of any two directions through the first buffer section 214. Moreover, the plurality of bent segments 214a can increase the redundant length of the first buffer section 214 without further increasing the space occupied by the first buffer section 214 in the first direction X, thereby increasing the moving distance of the second connecting section 213 relative to the first connecting section 211, making it easier for the second connecting section 212 to achieve a matching connection with external devices.

[0284] Among them, multiple bending segments 214a can be connected in sequence to form various shapes such as S-shape, Z-shape, W-shape, paperclip shape, and thread shape, so that the first buffer part 214 can form one or more combinations of various shapes such as S-shape, Z-shape, W-shape, paperclip shape, and thread shape, thereby improving the design freedom of the first pole ear 2. The specific design can be made according to actual needs, and no restrictions are imposed here.

[0285] like Figure 35 As shown, along the second direction Y of the battery 10, the width of the bent section 214a is less than or equal to the width of the first connecting part 211 and the second connecting part 212, thereby further reducing the space occupied by the first buffer part 214 in the second direction Y, which is beneficial to the miniaturization design of the first tab 2.

[0286] Furthermore, along the thickness direction Z of the battery 10, the thickness of the first buffer portion 214 is greater than or equal to the thickness of the first connecting portion 211 and the second connecting portion 212, thereby increasing the cross-sectional area of ​​the first buffer portion 214 and thus improving the current flow rate of the first buffer portion 214 and the current flow effect of the first tab 2.

[0287] Among them, such as Figure 25 As shown, the thicknesses of the first connecting portion 211 and the second connecting portion 212 can be designed to be the same to reduce manufacturing difficulty. The thickness of the first buffer portion 214 can be 1 to 2 times the thicknesses of the first connecting portion 211 and the second connecting portion 212. For example, the thickness of the first buffer portion 214 can be 1, 1.2, 1.4, 1.5, 1.6, 1.8, or 2 times the thicknesses of the first connecting portion 211 and the second connecting portion 212. Of course, the thicknesses of the first connecting portion 211 and the second connecting portion 212 can also be different, or the thickness of the first buffer portion 214 can be other values ​​within the above range. The specific design can be carried out according to actual design requirements, and no restrictions are imposed here.

[0288] In addition, such as Figure 35As shown, the thickness of the first buffer portion 214 can be made greater than or equal to the thickness of the first connecting portion 211 and the second connecting portion 212 by performing local electroplating on the first buffer portion 214 or by thinning the first connecting portion 211 and the second connecting portion 212. Of course, the thickness of the first buffer portion 214 can also be made greater than or equal to the thickness of the first connecting portion 211 and the second connecting portion 212 by other means. The specific design can be made according to actual needs and is not limited here.

[0289] The metal layer 21 can be an integrally formed structure, which makes the transition at the connection of each part of the metal layer 21 smoother, which is conducive to current flow and facilitates the mass production of the metal layer 21, saving preparation costs and improving preparation efficiency.

[0290] S22, as Figure 35 As shown, a cover film layer 22 is formed on the outer surface of the metal layer 2, and the cover film layer 22 is connected to each other at the gaps of the multiple bending segments 214a of the first buffer portion 214.

[0291] In this step, such as Figure 35 As shown, the covering film 22 is connected to each other at the gaps of the multiple bending segments 214a of the first buffer portion 214. This can keep the bending segments 214a of the first buffer portion 241 stable during the battery manufacturing process, thereby preventing the first buffer portion 241 from being overstretched and damaged, and ensuring the structural stability of the first buffer portion 214.

[0292] It should be noted that the above-mentioned punching of the first buffer section 241 means punching the part where the covering film layer 22 is connected to each other at the gaps of the multiple bending segments 214a of the first buffer section 214, so as to reduce the tensile force between the multiple bending segments 214a and improve the buffering effect of the first buffer section 214.

[0293] The cover film 22 is an insulating film that covers at least a portion of the metal layer 21. It protects the metal layer 21 from damage due to oxidation and corrosion, ensuring its long-term stable conductivity. Specifically, the cover film 22 can be made of polypropylene (PP), polyimide (PI), or nylon, giving it high strength, high temperature resistance, corrosion resistance, shear resistance, and other properties. This effectively protects the first tab 2 from corrosion by the battery electrolyte, external vibration, and excessive stress, improving its safety and reliability. Of course, the cover film 22 can also be made of other insulating materials such as rubber; the specific design is not limited here but can be tailored to actual needs.

[0294] like Figure 35As shown, along the first direction X of the battery 10, at least a portion of the first connecting portion 211 is exposed in the cover film layer 22 to form a first connecting end 211a. The first connecting end 211a is electrically connected to the cell body 1, thereby facilitating the electrical connection between the first tab 2 and the cell body 1 and improving the battery manufacturing efficiency. At least a portion of the second connecting portion 212 is exposed in the cover film layer 22 to form a second connecting end 212a, thereby enabling the battery 10 to be connected to the formation fixture during the formation process. That is, during the battery production process, the second connecting end 212 can be used to establish an electrical connection with the cell body 1 for battery formation, thereby further simplifying the manufacturing process. Furthermore, since battery formation does not require the use of the first solder pad 23, damage to the first solder pad 23 during the battery 10 production process can be avoided, thereby improving the connection reliability between the first tab 2 and external devices.

[0295] like Figure 35 As shown, the first tab 2 also includes a second sealing member 25, which is disposed on the side of the cover film 22 near the first connecting end 211a, and the first connecting portion 211 passes through the second sealing member 25. The second sealing member 25 is used to seal the opening of the cover film 22 and can prevent the electrolyte in the battery from contacting the cover film 22 and corroding the cover film.

[0296] The second seal 25 can be made of polypropylene (PP), polyimide (PI), or nylon, giving it high strength, high temperature resistance, corrosion resistance, shear resistance, and other characteristics. This effectively protects the first tab 2 from corrosion by the battery electrolyte, external vibration, and excessive stress, thus improving its safety and reliability. Of course, the second seal 25 can also be made of other corrosion-resistant materials; the specific design can be tailored to actual needs and is not limited here.

[0297] like Figure 35 As shown, in one specific embodiment, at least a portion of the second seal 25 covers the outer surface of the cover film 22, so that at least a portion of the cover film 22 can be located between the second seal 25 and the first connection portion 211, thereby further reducing the risk of direct contact between the cover film 22 and the electrolyte and improving the safety and reliability of the first tab 2.

[0298] Please refer to Figure 36 and Figure 37 , Figure 36 A schematic diagram of the structure of the battery provided in this application in a specific embodiment; Figure 37 This is a schematic diagram of the structure of the battery provided in this application in a specific embodiment.

[0299] In one specific embodiment, after forming the battery 10 through the exposed metal layer portion 212d of the second connection end 212a of the second connection portion 212, the method further includes:

[0300] S100, such as Figure 35 As shown, the second connecting portion 212 is cut along the dotted line in the figure to remove the exposed metal layer portion 212d of the second connecting end 212a to form Figure 36 The battery structure in the middle.

[0301] In this step, the exposed metal layer 212d can be removed by means of laser, shearing, etc., which can further reduce the volume of the first tab 2 and facilitate the subsequent sealing of the second connection end 212a.

[0302] S200, such as Figure 37 As shown, the cut second connecting end 212a is sealed to form a first sealing element 24 at the second connecting end 212a.

[0303] In this step, the first seal 24 is formed by curing materials such as adhesive or UV adhesive. Of course, the first seal 24 can also be made of other insulating materials, and the specific choice can be made according to actual needs, without any restrictions here.

[0304] In this embodiment, as Figure 35 and Figure 37 As shown, the first seal 24 protects the second connection end 212a from damage due to oxidation and corrosion, and also prevents short circuits at the second connection end 212a, further improving the safety and reliability of the first tab 2. Simultaneously, the first seal 24 can be tightly connected to at least a portion of the covering film 22 at the second connection end 212a, thereby preventing delamination of the covering film 22 at the second connection end 212a during battery production and improving the structural stability of the first tab 2.

[0305] Furthermore, please refer to again Figure 35Before forming the covering film 22 on the outer surface of the metal layer 2, a through hole 212c can be opened at the second connecting end 212a of the second connecting part 212. This allows the material of the covering film 22 to fill the through hole 212c during the preparation of the covering film 22, thereby enabling the covering films 22 at the through hole 212c to be interconnected in the thickness direction Z. This prevents the covering film 22 from delaminating with the metal layer 21 during the production of the battery 10, and reduces the cutting area of ​​the metal layer 21 after removing the exposed metal layer 212d. This increases the connection area between the covering film 22 and the first sealing member 24, thereby improving the connection strength between the first sealing member 24 and the covering film 22. This further enhances the structural stability of the first tab 2 and ensures the safety and reliability of the first tab 2.

[0306] The number of through holes 212c can be one or more. For example, there can be one, two, three, four, five, etc. The shape of the through holes 212c can be rectangular, circular, rhomboid, etc. The specific design can be set according to actual needs and is not limited here.

[0307] It should be noted that after removing the exposed metal layer 212d, the through hole 212c can form the notch 212b that penetrates the second connection end 212a as described above.

[0308] Furthermore, the first seal 24 can be formed during the manufacturing process of the battery 10 or during the manufacturing process of the electronic device. The specific configuration can be determined according to actual needs and is not limited here.

[0309] It should be noted that the reference numerals for the steps mentioned in the various embodiments of this application are merely for descriptive convenience and do not imply a substantial sequential relationship. Different steps in various specific embodiments can be combined in different orders to achieve the inventive objective of this invention.

[0310] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the device embodiments and terminal embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

[0311] The above descriptions are merely specific implementations of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A battery, characterized in that, include: Battery cell body; A first electrode tab includes a first metal layer, the first metal layer includes a first connecting portion, a first buffer portion, and a second connecting portion. The first buffer portion includes a first end and a second end. The first connecting portion is connected to the first end, and the second connecting portion is connected to the second end. The trace length between the first end and the second end is greater than the straight-line distance between the first end and the second end. The first buffer portion is capable of deformation. The first connecting portion is electrically connected to the battery cell body, and the second connecting portion is used for electrical connection to external devices. The second connecting portion is capable of displacement relative to the first connecting portion due to the deformation of the first buffer portion.

2. The battery according to claim 1, characterized in that, The trace between the first end and the second end includes one or more combinations of arc or polygonal shapes.

3. The battery according to claim 2, characterized in that, The traces between the first end and the second end form an S-shape, Z-shape, or W-shape.

4. The battery according to any one of claims 1 to 3, characterized in that, The thickness of the first buffer portion is greater than or equal to the thickness of the first connecting portion or the second connecting portion.

5. The battery according to any one of claims 1 to 4, characterized in that, The first electrode also includes a cover film layer, which covers at least a portion of the first metal layer; At least a portion of the second connection portion is exposed outside the covering film layer to form a second connection end.

6. The battery according to claim 5, characterized in that, The first tab also includes a first sealing element, which is disposed on the side of the cover film layer near the second connection end, for sealing the second connection end.

7. The battery according to claim 6, characterized in that, The second connection end is provided with a notch that penetrates the first metal layer; At least a portion of the covering membrane is disposed at the notch.

8. The battery according to any one of claims 5 to 7, characterized in that, At least a portion of the first connecting portion is exposed in the covering film layer to form a first connecting end.

9. The battery according to any one of claims 8, characterized in that, The first electrode tab also includes a second sealing element, which is disposed on the side of the cover film layer near the first connecting end, and the first connecting portion passes through the second sealing element.

10. The battery according to claim 9, characterized in that, At least a portion of the second seal covers the outer surface of the covering film.

11. The battery according to any one of claims 5 to 10, characterized in that, The first tab also includes a first pad, which passes through the cover film layer and is electrically connected to the second connection portion; The second connection portion is electrically connected to the external device via the first pad.

12. The battery according to any one of claims 1 to 11, characterized in that, The first tab includes a positive tab and a negative tab, and the battery also includes a second tab, which is electrically connected to the cell body and to either the positive tab or the negative tab.

13. The battery according to claim 12, characterized in that, The first metal layer of either the positive electrode tab or the negative electrode tab further includes a third connecting portion, which is connected to the first buffer portion. The third connection portion is provided with a second solder pad, which is electrically connected to the second electrode tab.

14. The battery according to claim 13, characterized in that, The second electrode includes a second metal layer, the second metal layer includes a fourth connecting portion, a second buffer portion and a fifth connecting portion, the second buffer portion includes a third end and a fourth end, the fourth connecting portion is connected to the third end, the fifth connecting portion is connected to the fourth end, the trace length between the third end and the fourth end is greater than the straight distance between the third end and the fourth end, and the second buffer portion can deform; The fourth connecting part is connected to the battery cell body; The fifth connection portion is provided with a third solder pad, which is electrically connected to the second solder pad.

15. An electronic device, characterized in that, It includes an external device and a battery as described in any one of claims 1 to 14, wherein the battery is electrically connected to the external device.

16. The electronic device according to claim 15, characterized in that, The electronic device further includes a first seal, which is disposed at the second connection end of the first tab of the battery and is used to seal the second connection end.

17. A method for preparing a battery, characterized in that, The method for preparing the battery according to any one of claims 1 to 14 comprises the following steps: Electrodes for preparing the main body of the battery cell; Prepare a first electrode tab to form a first connecting part, a first buffer part, and a second connecting part; The first connecting part is electrically connected to the electrode plate of the battery cell body; The electrode sheet connected to the first electrode tab is used to form the main body of the battery cell; Perform battery formation; The first buffer section is punched.

18. The method for preparing a battery according to claim 17, characterized in that, The battery formation process specifically includes: Battery formation is performed through the exposed metal layer portion of the second connection end of the second connection part.

19. The method for preparing a battery according to claim 18, characterized in that, After battery formation is performed on the exposed metal layer portion of the second connection end through the second connection portion, the method further includes: Cut the second connecting part to remove the exposed metal layer of the second connecting end; The cut second connecting end is sealed to form a first sealing element at the second connecting end.

20. The method for preparing a battery according to claim 17, characterized in that, The preparation of the first electrode tab to form a first connecting portion, a first buffer portion, and a second connecting portion specifically includes: A metal layer is prepared to form a first connecting portion, a first buffer portion, and a second connecting portion; A covering film is formed on the outer surface of the metal layer, and the covering film is interconnected at the gaps of the multiple bending segments of the first buffer portion.

21. The method for preparing a battery according to claim 20, characterized in that, Before forming a covering film layer on the outer surface of the metal layer, the method further includes: A through hole is made at the second connecting end of the second connecting part.

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