A battery and an electric device

Abstract

The utility model relates to battery technical field discloses a kind of battery and electric device, the structure design of the winding core of multiple tab is optimized, specifically is the distribution mode between the tab of same polarity when winding is optimized, so that the tab of same polarity is located at the different side of the thickness direction of winding core, and is set in dislocation, so as to not only reduce the width requirement of winding core, and the distance between the tab of same polarity is also enough big, can avoid causing the problem of excessive local heating;In addition, the high-rate charge-discharge performance of battery is also improved, the temperature rise when high-rate charge-discharge is reduced, so that the current dispersion in battery interior is more uniform, reaches the purpose of improving the electrical performance and safety of battery.

Description

Technical Field

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

[0002] With the rapid advancement of lithium-ion battery (Li-ion battery) technology, the industry has set more stringent and detailed requirements for its performance standards. Improvements in the high-rate charge and discharge performance of lithium-ion batteries are of paramount importance for many high-tech fields such as electric vehicles, portable mobile devices, and drones.

[0003] Specifically, in the electric vehicle sector, high-rate lithium batteries can deliver higher power, meeting the demands of rapid acceleration and sustained high-speed driving. Furthermore, their fast-charging capabilities significantly shorten the charging cycle of electric vehicles, thereby improving overall efficiency and convenience. In the drone sector, high-rate lithium batteries enable drones to achieve higher flight speeds and more stable flight attitudes, a crucial performance advantage for drones performing long-duration, high-intensity aerial missions. And in the field of portable mobile devices such as smartphones and tablets, high-rate lithium batteries not only significantly improve the devices' fast-charging capabilities but also ensure stable operation and superior performance in high-power application scenarios.

[0004] However, when batteries are charged and discharged at high rates, a significant amount of heat is generated. Especially at the tabs, the rapid temperature rise can lead to excessively high battery surface temperatures, posing a potential threat to battery safety. As a crucial interface for energy exchange between the battery's internal components and the external environment, the design of the tabs has a vital impact on battery thermal management and overall safety. According to relevant research, increasing the number of tabs or adjusting their position can effectively reduce the battery's internal resistance, thereby reducing temperature rise and improving heat dissipation efficiency.

[0005] Therefore, it is necessary to further improve and optimize the existing technology to address its shortcomings and limitations.

[0006] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0007] This utility model provides a battery and an electrical device to solve the problems existing in the prior art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] In a first aspect, the present invention provides a battery comprising a wound cell, wherein the wound cell comprises a positive electrode sheet, a separator, a negative electrode sheet, a first positive electrode tab, a second positive electrode tab, a first negative electrode tab, and a second negative electrode tab;

[0010] In the thickness direction of the wound battery cell, the wound battery cell has a first side and a second side disposed opposite to each other; the first positive electrode tab and the second negative electrode tab are located on the first side of the wound battery cell, and the second positive electrode tab and the first negative electrode tab are located on the second side of the wound battery cell; and the first positive electrode tab and the second positive electrode tab are disposed in a staggered manner, and the first negative electrode tab and the second negative electrode tab are disposed in a staggered manner.

[0011] The first positive electrode ear portion includes a plurality of stacked first positive electrode ears;

[0012] The second positive electrode ear includes a plurality of stacked second positive electrode ears;

[0013] The first negative electrode ear portion includes a plurality of stacked first negative electrode ears;

[0014] The second negative electrode ear portion includes a plurality of stacked second negative electrode ears;

[0015] In the width direction of the positive electrode sheet, the positive electrode sheet has a first side and a second side disposed opposite to each other; a plurality of first positive electrode tabs are arranged at intervals on the first side of the positive electrode sheet;

[0016] A plurality of second positive tabs are arranged at intervals on the first side of the positive electrode plate, and each second positive tab is disposed adjacent to a corresponding first positive tab;

[0017] In the width direction of the negative electrode sheet, the negative electrode sheet has a first side and a second side disposed opposite to each other; a plurality of first negative electrode tabs are arranged at intervals on the first side of the negative electrode sheet;

[0018] A plurality of second negative electrode tabs are arranged at intervals on the first side of the negative electrode sheet, and each second negative electrode tab is disposed adjacent to a corresponding first negative electrode tab.

[0019] Furthermore, in the battery, in the winding direction of the wound cell, the distance b1 between the first positive electrode tab and the second positive electrode tab that are disposed adjacent to each other is 5-60mm;

[0020] In the winding direction of the wound cell, the distance b2 between the first negative electrode lug and the second negative electrode lug that are arranged adjacent to each other is 5-60mm.

[0021] Furthermore, in the battery, in the width direction of the wound cell, the innermost ring of the wound cell has a first end and a second end disposed opposite to each other;

[0022] The distance c between the first side of the second positive electrode tab and the first end of the innermost ring of the wound cell is 5-12mm; the first side of the second positive electrode tab is the side of the second positive electrode tab that is close to the first end of the innermost ring of the wound cell.

[0023] The distance d between the second side of the first negative electrode lug and the second end of the innermost ring of the wound cell is 5-12mm; the second side of the first negative electrode lug is the side of the first negative electrode lug that is close to the second end of the innermost ring of the wound cell.

[0024] The distance e between the first side of the second positive electrode ear and the first side of the first positive electrode ear is 25-55mm; the first side of the first positive electrode ear is the side closer to the second positive electrode ear;

[0025] The distance f between the second side of the first negative electrode ear and the second side of the second negative electrode ear is 25-55mm; the second side of the second negative electrode ear is the side closer to the first negative electrode ear;

[0026] The distance g between the first side of the first positive electrode ear and the second side of the second negative electrode ear is 30-60mm.

[0027] Furthermore, in the battery, the widths of the first positive electrode tab and the second positive electrode tab are the same in the winding direction of the wound cell;

[0028] In the height direction of the wound cell, the first positive electrode tab and the second positive electrode tab are at the same height;

[0029] In the winding direction of the wound cell, the widths of the first negative electrode tab and the second negative electrode tab are the same, and are also the same as the widths of the first positive electrode tab and the second positive electrode tab.

[0030] In the height direction of the wound battery cell, the first negative electrode tab and the second negative electrode tab are at the same height, and are also at the same height as the first positive electrode tab and the second positive electrode tab.

[0031] Furthermore, the battery also includes a positive electrode adapter and a negative electrode adapter;

[0032] Both the positive electrode adapter and the negative electrode adapter are elongated strips;

[0033] The length of the positive electrode adapter extends along the width direction of the wound cell, and the positive electrode adapter is located in the middle between the first positive electrode tab and the second positive electrode tab;

[0034] The first positive electrode tab extends from one side of the positive electrode adapter piece in the width direction and is bent and welded to the positive electrode adapter piece; the width direction of the positive electrode adapter piece is the same as the thickness direction of the wound cell;

[0035] The second positive electrode tab extends from the other side of the positive electrode adapter piece in the width direction and is bent and welded to the positive electrode adapter piece;

[0036] The length of the negative electrode adapter extends along the width direction of the wound cell, and the negative electrode adapter is located in the middle between the first negative electrode lug and the second negative electrode lug;

[0037] The first negative electrode tab extends from one side of the negative electrode adapter piece in the width direction and is bent and welded to the negative electrode adapter piece; the width direction of the negative electrode adapter piece is the same as the thickness direction of the wound cell;

[0038] The second negative electrode ear protrudes from the other side of the width direction of the negative electrode adapter piece and is bent and welded to the negative electrode adapter piece.

[0039] Furthermore, in the battery, the widths of the first positive electrode tab and the second positive electrode tab are the same in the winding direction of the wound cell;

[0040] In the height direction of the wound battery cell, the height of the first positive electrode tab is greater than the height of the second positive electrode tab;

[0041] In the winding direction of the wound cell, the widths of the first negative electrode tab and the second negative electrode tab are the same;

[0042] In the height direction of the wound cell, the height of the second negative electrode tab is greater than the height of the first negative electrode tab, and the height of the first negative electrode tab is equal to the height of the second positive electrode tab, and the height of the second negative electrode tab is equal to the height of the first positive electrode tab.

[0043] Furthermore, the battery also includes a positive electrode adapter and a negative electrode adapter;

[0044] Both the positive electrode adapter and the negative electrode adapter are elongated strips;

[0045] The length of the positive electrode adapter extends along the width direction of the wound cell, and the positive electrode adapter is located between the first positive electrode tab and the second positive electrode tab, and is disposed close to the second positive electrode tab;

[0046] The first positive electrode tab extends from one side of the positive electrode adapter piece in the width direction and is bent and welded to the positive electrode adapter piece; the width direction of the positive electrode adapter piece is the same as the thickness direction of the wound cell;

[0047] The second positive electrode tab extends from the other side of the positive electrode adapter piece in the width direction and is bent and welded to the positive electrode adapter piece;

[0048] The length of the negative electrode adapter extends along the width direction of the wound cell, and the negative electrode adapter is located between the first negative electrode lug and the second negative electrode lug, and is disposed close to the first negative electrode lug.

[0049] The first negative electrode tab extends from one side of the negative electrode adapter piece in the width direction and is bent and welded to the negative electrode adapter piece; the width direction of the negative electrode adapter piece is the same as the thickness direction of the wound cell;

[0050] The second negative electrode ear protrudes from the other side of the width direction of the negative electrode adapter piece and is bent and welded to the negative electrode adapter piece.

[0051] Furthermore, in the battery, the number of wound cells is two;

[0052] The two wound cells are stacked in the thickness direction and arranged in a mirror-symmetrical manner;

[0053] It also includes positive electrode adapter and negative electrode adapter;

[0054] The positive electrode adapter is U-shaped and includes a first positive electrode welding section and a second positive electrode welding section arranged symmetrically on the left and right, as well as a positive electrode connection section connecting the first positive electrode welding section and the second positive electrode welding section.

[0055] The length of the first positive electrode welding section extends along the width direction of one of the wound cells, and the first positive electrode welding section is located between the first positive electrode tab and the second positive electrode tab of one of the wound cells, and is disposed close to the second positive electrode tab; the first positive electrode tab extends out from one side of the width direction of the first positive electrode welding section and is bent and welded to the first positive electrode welding section; the second positive electrode tab extends out from the other side of the width direction of the first positive electrode welding section and is bent and welded to the first positive electrode welding section;

[0056] The length of the second positive electrode welding section extends along the width direction of the other wound cell, and the second positive electrode welding section is located between the first positive electrode tab and the second positive electrode tab of the other wound cell, and is disposed close to the second positive electrode tab; the first positive electrode tab protrudes from one side of the width direction of the second positive electrode welding section and is bent and welded to the second positive electrode welding section; the second positive electrode tab protrudes from the other side of the width direction of the second positive electrode welding section and is bent and welded to the second positive electrode welding section;

[0057] The negative electrode adapter piece is U-shaped and includes a first negative electrode welding section and a second negative electrode welding section arranged symmetrically on the left and right, as well as a negative electrode connection section connecting the first negative electrode welding section and the second negative electrode welding section.

[0058] The length of the first negative electrode welding section extends along the width direction of one of the wound cells, and the first negative electrode welding section is located between the first negative electrode tab and the second negative electrode tab of one of the wound cells, and is disposed close to the first negative electrode tab; the first negative electrode tab protrudes from one side of the width direction of the first negative electrode welding section and is bent and welded to the first negative electrode welding section; the second negative electrode tab protrudes from the other side of the width direction of the first negative electrode welding section and is bent and welded to the first negative electrode welding section;

[0059] The length of the second negative electrode welding section extends along the width direction of the other wound cell, and the second negative electrode welding section is located between the first negative electrode lug and the second negative electrode lug of the other wound cell, and is disposed close to the first negative electrode lug; the first negative electrode lug protrudes from one side of the width direction of the second negative electrode welding section and is bent and welded to the second negative electrode welding section; the second negative electrode lug protrudes from the other side of the width direction of the second negative electrode welding section and is bent and welded to the second negative electrode welding section.

[0060] Furthermore, in the battery, in the width direction of the wound cell, the lengths of the positive electrode adapter and the negative electrode adapter are both 30-120mm;

[0061] In the thickness direction of the wound cell, the width of both the positive electrode adapter and the negative electrode adapter is 20-50mm.

[0062] Secondly, this utility model provides an electrical device, including the battery provided in the first aspect above.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] This utility model provides a battery and electrical device that optimizes the structural design of a multi-tab wound cell. Specifically, it optimizes the distribution of tabs of the same polarity during winding, so that the tabs of the same polarity are located on different sides of the thickness direction of the wound cell and are staggered. This not only reduces the width requirement of the wound cell, but also ensures that the distance between the tabs of the same polarity is large enough to avoid the problem of excessive local heat generation. In addition, it improves the high-rate charge and discharge performance of the battery, reduces the temperature rise during high-rate charge and discharge, and makes the current inside the battery more evenly distributed, thereby improving the electrical performance and safety of the battery.

[0065] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0066] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a schematic diagram of the structure of a wound battery cell with four tabs extending from one side in the existing technology;

[0068] Figure 2 This is a schematic diagram of a structure in the prior art where the distance between the same polarity tabs on the electrode sheet is too close;

[0069] Figure 3 This is a schematic diagram of the structure of a wound battery cell formed by winding in a battery according to Embodiment 1 of this utility model;

[0070] Figure 4 This is a schematic diagram of the structure of the positive electrode, separator, negative electrode, and separator stacked according to Embodiment 1 of this utility model;

[0071] Figure 5 This is one of the structural schematic diagrams of the positive electrode and negative electrode provided in Embodiment 1 of this utility model;

[0072] Figure 6 This is one of the structural schematic diagrams of a wound battery cell and a long strip-shaped adapter piece provided in Embodiment 1 of this utility model;

[0073] Figure 7 This is the second schematic diagram of the structure of the positive electrode and negative electrode provided in Embodiment 1 of this utility model;

[0074] Figure 8 This is the second schematic diagram of the structure of a wound battery cell and a long strip-shaped adapter piece provided in Embodiment 1 of this utility model;

[0075] Figure 9 This is a schematic diagram of the structure of two wound cells and a U-shaped adapter piece in a battery according to Embodiment 1 of this utility model;

[0076] Figure 10This is a schematic diagram of the U-shaped positive electrode adapter provided in Embodiment 1 of this utility model;

[0077] Figure 11 This is a schematic diagram of the U-shaped negative electrode adapter provided in Embodiment 1 of this utility model.

[0078] Figure label:

[0079] Positive electrode 1, separator 2, negative electrode 3, first positive electrode tab 6, second positive electrode tab 7, first negative electrode tab 8, second negative electrode tab 9, positive electrode adapter 10, negative electrode adapter 11, wound cell 12.

[0080] First positive electrode ear 41, second positive electrode ear 42;

[0081] First negative electrode ear 51, second negative electrode ear 52;

[0082] First positive electrode welding section 101, second positive electrode welding section 102, positive electrode connection section 103;

[0083] First negative electrode welding section 111, second negative electrode welding section 112, negative electrode connection section 113. Detailed Implementation

[0084] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0085] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0086] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0087] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0088] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0089] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0090] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0091] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0092] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0093] Example 1

[0094] In the prior art, patent CN216488286U proposes a solution that uses a winding method to form a wound battery cell, and leads out four tabs (two positive tabs and two negative tabs) from one side of the wound battery cell in the thickness direction, such as... Figure 1 As shown. Although this multi-tab design enhances the current carrying capacity of the wound cell to some extent, making the cell perform better in current transmission, it also places specific requirements on the size of the wound cell. Specifically, the width l of the wound cell must be large enough to accommodate four cut tabs; otherwise, the expected tab lead-out effect cannot be achieved.

[0095] Furthermore, since the width l of the wound cell is a fixed parameter, the distance 'a' between the two positive tabs and the two negative tabs is relatively small due to this limitation. Figure 2 As shown. This relatively small distance between the tabs can still easily lead to excessive localized heat generation during actual battery operation, which may affect the overall performance and lifespan of the battery.

[0096] To effectively solve the above-mentioned problems, please refer to... Figure 3-4 This utility model provides a novel battery. The battery is mainly composed of a wound cell 12, which is further subdivided into multiple components such as a positive electrode 1, a separator 2, a negative electrode 3, a first positive electrode tab 6, a second positive electrode tab 7, a first negative electrode tab 8, and a second negative electrode tab 9.

[0097] Among them, such as Figure 4 As shown, the positive electrode 1, separator 2, negative electrode 3, and separator 2 are stacked in a specific order, and then the winding process is carried out to finally obtain the wound cell 12.

[0098] In the thickness direction of the wound cell 12 (i.e. Figure 3In the T direction (as shown in the diagram), the wound cell 12 has a first side and a second side disposed opposite to each other. Specifically, the first positive electrode tab 6 and the second negative electrode tab 9 are located on the first side of the wound cell 12, while the second positive electrode tab 7 and the first negative electrode tab 8 are located on the second side of the wound cell 12. Furthermore, the first positive electrode tab 6 and the second positive electrode tab 7 are staggered, and the first negative electrode tab 8 and the second negative electrode tab 9 are also staggered.

[0099] Looking at it more closely, the first positive electrode ear 6 includes a plurality of first positive electrode ears 41 stacked together; the second positive electrode ear 7 includes a plurality of second positive electrode ears 42 stacked together; the first negative electrode ear 8 includes a plurality of first negative electrode ears 51 stacked together; and the second negative electrode ear 9 includes a plurality of second negative electrode ears 52 stacked together.

[0100] It should be noted that, taking several first positive tabs 41 as an example, when these first positive tabs 41 are stacked, they can be aligned, but there may also be some deviation. Alignment is undoubtedly the best ideal state, but in actual production, due to various reasons in the process, the tabs in normal products often have a certain degree of deviation when stacked.

[0101] In the width direction of positive electrode 1 (i.e. Figure 4 In the y-direction, the positive electrode 1 also has a first side and a second side arranged opposite to each other. A plurality of first positive tabs 41 are arranged at certain intervals on the first side of the positive electrode 1; a plurality of second positive tabs 42 are also arranged at intervals on the first side of the positive electrode 1, and each second positive tab 42 is arranged adjacent to a corresponding first positive tab 41.

[0102] Similarly, in the width direction of the negative electrode 3 (i.e. Figure 4 In the y-direction, the negative electrode 3 has a first side and a second side arranged opposite to each other. A plurality of first negative electrode tabs 51 are arranged at intervals on the first side of the negative electrode 3; a plurality of second negative electrode tabs 52 are also arranged at intervals on the first side of the negative electrode 3, and each second negative electrode tab 52 is arranged adjacent to a corresponding first negative electrode tab 51.

[0103] It should be noted that this embodiment achieves this through in-depth and meticulous optimization of the structural design of the multi-tab wound cell 12. Specifically, it innovatively improves the distribution of the same-polarity tabs during the winding process. This improvement allows the same-polarity tabs to be distributed on different sides of the cell's thickness direction, and arranged in a staggered manner. This carefully designed structure significantly reduces the impact on the cell width (i.e., the cell's thickness). Figure 3The design incorporates dimensions along the L direction (as required in the diagram), allowing for more flexible and rational cell size design. It also effectively increases the distance between electrodes of the same polarity, fundamentally preventing localized overheating and improving battery stability and safety during operation. Furthermore, this innovative design significantly enhances the battery's high-rate charge / discharge capabilities, effectively reducing temperature rise during high-rate charging and discharging, resulting in a more uniform current distribution within the battery. Ultimately, this achieves a dual improvement in battery electrical performance and safety, providing more reliable technical support for the development and application of battery technology.

[0104] Please refer to this again. Figure 3 and in conjunction with references Figure 5 In one specific embodiment of this invention, in order to ensure that the battery can simultaneously exhibit fast charging capability and high energy density, the key dimensions in the battery structure are precisely set. Specifically, in the winding direction of the wound cell 12, the distance b1 between the first positive electrode tab 6 and the second positive electrode tab 7, which are adjacent to each other, is limited to a value within the range of 5-60mm;

[0105] It is understandable that, such as Figure 5 As shown, if we consider the unwound positive electrode 1, it is along the length direction of the positive electrode 1 (i.e., Figure 5 In the x-direction, the distance b1 between the first positive electrode tab 41 and the second positive electrode tab 42 that are adjacent to each other is limited to a value within the range of 5-60mm;

[0106] Similarly, in order to maintain the balance of the current distribution inside the battery, the distance between the first negative electrode tab 8 and the second negative electrode tab 9, which are located adjacent to each other, is limited to b2 in the winding direction of the wound cell 12, but b2=b1, that is, b2 is also limited to a value within the range of 5-60mm.

[0107] It is understandable that, such as Figure 5 As shown, if we consider the unwound negative electrode 3, it is along the length direction of the negative electrode 3 ( Figure 5 In the x-direction, the distance b2 between the first negative electrode tab 51 and the second negative electrode tab 52 that are adjacent to each other is limited to a value within the range of 5-60mm;

[0108] It is necessary to explain in detail here that the distance between tabs of the same polarity needs to be set with multiple considerations in mind. On the one hand, if the distance is too large, the current will encounter greater resistance when passing through, leading to an increase in the internal resistance of the battery, ultimately adversely affecting the battery's discharge efficiency and performance. On the other hand, if the distance is too small, there is a very high risk of a short circuit inside the battery, which will not only seriously damage the battery's normal function, but may also cause extreme dangerous situations such as overheating or even explosion, posing a significant threat to safety. Therefore, setting a reasonable distance between the tabs is crucial to ensuring battery performance and safety.

[0109] Please refer to this again. Figure 3 The detailed dimensional settings of the battery structure in this embodiment are further explained below:

[0110] In the width direction of the wound cell 12 (i.e. Figure 3 In the L direction of the winding cell 12, the innermost ring has a first end and a second end that are disposed opposite to each other.

[0111] The distance c between the first side of the second positive electrode tab 7 and the first end of the innermost ring of the wound cell 12 is 5-12mm; the first side of the second positive electrode tab 7 is the side of the second positive electrode tab 7 that is close to the first end of the innermost ring of the wound cell 12; this size setting is designed to ensure that the spatial arrangement between the second positive electrode tab 7 and the internal structure of the cell is neither too compact to avoid potential physical interference or short circuit risk, nor too loose to maintain the efficiency of current conduction.

[0112] The distance d between the second side of the first negative electrode ear 8 and the second end of the innermost ring of the wound cell 12 is 5-12mm; the second side of the first negative electrode ear 8 is the side of the first negative electrode ear 8 that is close to the second end of the innermost ring of the wound cell 12; this size design is also to balance the current transmission efficiency and the physical safety of the internal structure of the cell.

[0113] The distance e between the first side of the second positive electrode ear 7 and the first side of the first positive electrode ear 6 is 25-55mm; the first side of the first positive electrode ear 6 is the side closer to the second positive electrode ear 7; this design aims to reduce the transmission resistance of current between the positive electrode ears, while ensuring a reasonable spatial distribution between the positive electrode ears to avoid overheating or short circuit problems.

[0114] The distance f between the second side of the first negative electrode ear 8 and the second side of the second negative electrode ear 9 is 25-55mm; the second side of the second negative electrode ear 9 is the side closer to the first negative electrode ear 8; this size design helps to distribute the current evenly between the negative electrode ears, while maintaining the safety performance of the battery.

[0115] The distance g between the first side of the first positive electrode tab 6 and the second side of the second negative electrode tab 9 is 30-60 mm. This design aims to balance the current transmission efficiency between the positive and negative electrode tabs with the safety of the battery structure, ensuring stable operation of the battery during high-rate charging and discharging.

[0116] In summary, by precisely setting these key dimensions, the battery structure of this embodiment has achieved significant results in improving current transmission efficiency, optimizing internal space layout, and enhancing battery safety.

[0117] It is understandable that, as described above, the purpose of this embodiment is to both reduce the width requirement of the battery cell (that is, not to increase the width of the battery cell) and ensure that it is wide enough to accommodate four cut tabs, while also ensuring that the distance between tabs of the same polarity is large enough. However, if the width of the battery cell is allowed to increase, for example, to a length of 300-500mm, more tabs can be provided on the electrode sheet, thereby allowing more tabs to be drawn out when the battery cell 12 is wound. Taking the positive tab as an example, the wound battery cell 12 can include not only the first positive tab 6 and the second positive tab 7, but also the third positive tab and the fourth positive tab. In the winding direction of the battery cell 12, the first positive tab 6, the third positive tab, the second positive tab 7 and the fourth positive tab are arranged sequentially. After winding, the first positive tab 6 and the third positive tab are arranged on one side of the thickness direction of the wound battery cell 12, while the second positive tab 7 and the fourth positive tab are arranged on the other side of the thickness direction of the wound battery cell 12.

[0118] In one embodiment of this example, when the number of wound cells 12 is one, there are two different designs for the size of the tabs, which will be described below.

[0119] Please refer to this again. Figure 5 In the first design, the winding direction of the wound cell 12 (if viewed from the perspective of the unwound positive electrode 1, it is along the length of the positive electrode 1, i.e.) Figure 5 In the x-direction, the width w1 of the first positive electrode tab 41 and the width w2 of the second positive electrode tab 42 are the same, which is 10-30mm, ensuring the uniformity of current distribution.

[0120] In the height direction of the wound cell 12 (or, if viewed from the perspective of the unwound positive electrode 1, in the width direction of the positive electrode 1, i.e.) Figure 5 In the y-direction of the image, the height h1 of the first positive electrode tab 41 and the height h2 of the second positive electrode tab 42 are the same, which is 10-16mm. This design not only ensures sufficient current transmission capacity, but also facilitates manufacturing and welding.

[0121] The winding direction of the wound cell 12 (if viewed from the perspective of the unwound negative electrode 3, it is along the length of the negative electrode 3, i.e.) Figure 5 In the x direction, the width w3 of the first negative electrode 51 and the width w4 of the second negative electrode 52 are the same, which is 10-30mm, and are the same as the width w1 of the first positive electrode 41 and the width w2 of the second positive electrode 42.

[0122] In the height direction of the wound cell 12 (or, if viewed from the perspective of the unwound negative electrode 3, in the width direction of the negative electrode 3, i.e.) Figure 5 In the y-direction of the battery, the height h3 of the first negative electrode tab 51 and the height h4 of the second negative electrode tab 52 are the same, both being 10-16 mm, and are also the same as the height h1 of the first positive electrode tab 41 and the height h2 of the second positive electrode tab 42. This design helps maintain the balance between the positive and negative electrodes of the battery, ensuring stable battery performance.

[0123] Accordingly, please refer to Figure 6 The battery also includes a positive electrode adapter 10 and a negative electrode adapter 11;

[0124] Both the positive electrode adapter 10 and the negative electrode adapter 11 are elongated strips;

[0125] The length of the positive electrode adapter 10 is along the width direction of the wound cell 12 (i.e., Figure 6 The positive electrode adapter 10 extends in the L direction and is located in the middle between the first positive electrode ear 6 and the second positive electrode ear 7; this design allows the current to be evenly transmitted to other parts of the battery through the adapter.

[0126] The first positive electrode ear 6 extends from the width direction of the positive electrode adapter 10 (the width direction of the positive electrode adapter 10 is the same as the thickness direction of the wound cell 12, i.e.) Figure 6 The electrode extends out from one side (in the T direction) and is bent and welded to the positive electrode adapter 10, ensuring good electrical connection and mechanical strength, the same below.

[0127] The second positive electrode ear 7 extends out from the other side of the width direction of the positive electrode adapter piece 10 and is bent and welded to the positive electrode adapter piece 10;

[0128] The length of the negative electrode adapter 11 extends along the width direction of the wound cell 12, and the negative electrode adapter 11 is located in the middle between the first negative electrode ear 8 and the second negative electrode ear 9.

[0129] The first negative electrode ear 8 extends from the width direction of the negative electrode adapter piece 11 (the width direction of the negative electrode adapter piece 11 is the same as the thickness direction of the wound cell 12, i.e.) Figure 6 It extends out from one side (in the T direction) and is bent and welded to the negative electrode adapter piece 11;

[0130] The second negative electrode ear 9 extends from the other side of the negative electrode adapter piece 11 in the width direction and is bent and welded to the negative electrode adapter piece 11.

[0131] Please refer to Figure 7 In the second design, the winding direction of the wound cell 12 (or, if viewed from the perspective of the unwound positive electrode 1, the length direction of the positive electrode 1, i.e.) Figure 7 (in the x direction), the width w1 of the first positive electrode tab 41 and the width w2 of the second positive electrode tab 42 are the same, which is 10-30mm;

[0132] In the height direction of the wound cell 12 (or, if viewed from the perspective of the unwound positive electrode 1, in the width direction of the positive electrode 1, i.e.) Figure 7 (in the y direction), the height h1 of the first positive electrode 41 is greater than the height h2 of the second positive electrode 42, h1 is 12-18mm and h2 is 10-16mm; this design gives the first positive electrode 41 a larger flow area, which helps to reduce the local temperature rise of the electrode.

[0133] The winding direction of the wound cell 12 (if viewed from the perspective of the unwound negative electrode 3, it is along the length of the negative electrode 3, i.e.) Figure 7 In the x-direction, the width w3 of the first negative electrode tab 51 and the width w4 of the second negative electrode tab 52 are the same, which is 10-30mm.

[0134] In the height direction of the wound cell 12 (or, if viewed from the perspective of the unwound negative electrode 3, in the width direction of the negative electrode 3, i.e.) Figure 7 In the y-direction of the first negative electrode 51, the height h4 of the second negative electrode 52 is greater than the height h3 of the first negative electrode 51, and the height h3 of the first negative electrode 51 is equal to the height h2 of the second positive electrode 42, while the height h4 of the second negative electrode 52 is equal to the height h1 of the first positive electrode 41. This design also allows the second negative electrode 52 to have a larger flow area, which helps to reduce the local temperature rise of the electrode.

[0135] Accordingly, please refer to Figure 8 The battery also includes a positive electrode adapter 10 and a negative electrode adapter 11;

[0136] Both the positive electrode adapter 10 and the negative electrode adapter 11 are elongated strips;

[0137] The length of the positive electrode adapter 10 is along the width direction of the wound cell 12 (i.e., Figure 8The positive electrode adapter 10 extends in the L direction and is located between the first positive electrode ear 6 and the second positive electrode ear 7, and is disposed close to the second positive electrode ear 7.

[0138] The first positive electrode ear 6 extends from the width direction of the positive electrode adapter 10 (the width direction of the positive electrode adapter 10 is the same as the thickness direction of the wound cell 12, i.e.) Figure 8 It extends out from one side (in the T direction) and is bent and welded to the positive electrode adapter piece 10;

[0139] The second positive electrode ear 7 extends out from the other side of the width direction of the positive electrode adapter piece 10 and is bent and welded to the positive electrode adapter piece 10;

[0140] The length of the negative electrode adapter 11 extends along the width direction of the wound cell 12, and the negative electrode adapter 11 is located between the first negative electrode ear 8 and the second negative electrode ear 9, and is disposed close to the first negative electrode ear 8.

[0141] The first negative electrode ear 8 extends from the width direction of the negative electrode adapter piece 11 (the width direction of the negative electrode adapter piece 11 is the same as the thickness direction of the wound cell 12, i.e.) Figure 8 It extends out from one side (in the T direction) and is bent and welded to the negative electrode adapter piece 11;

[0142] The second negative electrode ear 9 extends from the other side of the negative electrode adapter piece 11 in the width direction and is bent and welded to the negative electrode adapter piece 11.

[0143] As can be seen, unlike the first design, the positive electrode adapter 10 is positioned closer to the second positive electrode tab 7, and the negative electrode adapter 11 is positioned closer to the first negative electrode tab 8. This design helps to further optimize the current transmission path and reduce resistance and temperature rise.

[0144] It should be noted that, relatively speaking, the first design has the advantages of simple structure, easy manufacturing, and lower cost. It is suitable for applications where battery performance requirements are not particularly high.

[0145] The advantage of the second design is that by designing the first positive tab 41 and the second negative tab 52 to have a higher height, it facilitates welding and increases the current flow area, reducing local temperature rise of the tabs. This design is suitable for applications requiring high battery performance and long-term high-load operation.

[0146] In conclusion, both design schemes have their advantages and disadvantages, and the choice of which scheme to use depends on the specific application scenario and requirements.

[0147] When the width of the battery cell is allowed to be increased, thus allowing for more tabs to be placed on the electrode plates, the relationship between the length M of the adapter plate and the tabs is as follows:

[0148] M = 50 + m(n-1) + p*n;

[0149] Where M is the length of the adapter piece, m is the distance between two electrodes of the same polarity, ranging from 5 to 60 mm, n is the number of electrodes, and p is the width of the electrodes.

[0150] Determination of the distance: Using a 78Ah battery with dimensions of 256*100*26 mm as an example, simulations were conducted to simulate the impact of varying positive / negative electrode spacing on the battery temperature field under 4C charging. The optimal distance between electrodes of the same polarity was determined by the maximum temperature rise at the tabs. Simulation and experimental results show that the temperature rise gradually increases as the distance between electrodes of the same polarity decreases. When the distance between the tabs is less than 5 mm, the battery temperature reaches 62.4℃, exceeding the battery's safe operating temperature. Conversely, as the distance between the tabs of the same polarity increases, the battery temperature rise decreases, making battery use safer. However, since the length of the adapter plate also increases with the increase in the distance between the tabs of the same polarity, the weight of the current collector inside the battery increases, thus reducing the battery's energy density.

[0151] In one specific embodiment of this invention, a battery structure comprising two wound cells 12 is designed. When the number of wound cells 12 is two, please refer to... Figure 9 The two wound cells 12 are stacked in the thickness direction and arranged in a mirror symmetrical manner; this layout not only optimizes the space utilization of the battery, but also ensures the balance of current transmission and the stability of battery performance.

[0152] When there are two battery cells 12, there is only one design option for the size of the electrode tabs. Specifically, the design of the electrode tab size is as follows: Figure 7 As shown, the width of the first positive electrode tab 41 is equal to the width of the second positive electrode tab 42, and the height of the first positive electrode tab 41 is greater than the height of the second positive electrode tab 42; the width of the first negative electrode tab 51 is equal to the width of the second negative electrode tab 52, and the height of the second negative electrode tab 52 is greater than the height of the first negative electrode tab 51.

[0153] In order to effectively connect the positive and negative terminals of the two cells, the battery also includes a positive terminal adapter 10 and a negative terminal adapter 11.

[0154] The positive electrode adapter 10 is U-shaped, such as... Figure 10 As shown, it includes a first positive electrode welding section 101 and a second positive electrode welding section 102 arranged symmetrically on the left and right, and a positive electrode connection section 103 connecting the first positive electrode welding section 101 and the second positive electrode welding section 102.

[0155] The length of the first positive electrode welding section 101 is along the width direction of one of the wound cells 12 (i.e. Figure 9 The first positive electrode welding section 101 extends in the L direction and is located between the first positive electrode lug 6 and the second positive electrode lug 7 of one of the wound cells 12, and is disposed close to the second positive electrode lug 7; the first positive electrode lug 6 extends out from one side of the width direction of the first positive electrode welding section 101 and is bent and welded to the first positive electrode welding section 101; the second positive electrode lug 7 extends out from the other side of the width direction of the first positive electrode welding section 101 and is bent and welded to the first positive electrode welding section 101.

[0156] The length of the second positive electrode welding section 102 is along the width direction of the other wound cell 12 (i.e. Figure 9 The second positive electrode welding section 102 extends in the L direction and is located between the first positive electrode lug 6 and the second positive electrode lug 7 of the other wound cell 12, and is disposed close to the second positive electrode lug 7; the first positive electrode lug 6 extends out from one side of the width direction of the second positive electrode welding section 102 and is bent and welded to the second positive electrode welding section 102; the second positive electrode lug 7 extends out from the other side of the width direction of the second positive electrode welding section 102 and is bent and welded to the second positive electrode welding section 102;

[0157] The negative electrode adapter 11 is U-shaped, such as Figure 11 As shown, it includes a first negative electrode welding section 111 and a second negative electrode welding section 112 arranged symmetrically on the left and right, and a negative electrode connecting section 113 connecting the first negative electrode welding section 111 and the second negative electrode welding section 112.

[0158] The length of the first negative electrode welding section 111 is along the width direction of one of the wound cells 12 (i.e. Figure 9 The first negative electrode welding section 111 extends in the L direction and is located between the first negative electrode lug 8 and the second negative electrode lug 9 of one of the wound cells 12, and is disposed close to the first negative electrode lug 8; the first negative electrode lug 8 extends out from one side of the width direction of the first negative electrode welding section 111 and is bent and welded to the first negative electrode welding section 111; the second negative electrode lug 9 extends out from the other side of the width direction of the first negative electrode welding section 111 and is bent and welded to the first negative electrode welding section 111.

[0159] The length of the second negative electrode welding section 112 is along the width direction of the other wound cell 12 (i.e. Figure 9The second negative electrode welding section 112 extends in the L direction and is located between the first negative electrode ear 8 and the second negative electrode ear 9 of the other wound cell 12, and is disposed close to the first negative electrode ear 8; the first negative electrode ear 8 extends out from one side of the width direction of the second negative electrode welding section 112 and is bent and welded to the second negative electrode welding section 112; the second negative electrode ear 9 extends out from the other side of the width direction of the second negative electrode welding section 112 and is bent and welded to the second negative electrode welding section 112.

[0160] It should be noted that this U-shaped adapter design not only ensures reliable connections between the wound cells 12 and between the wound cells 12 and external circuits, but also effectively disperses thermal stress during current transmission through its U-shaped structure, thereby improving the overall performance and safety of the battery. Furthermore, because the cells are arranged in a mirror-symmetric manner, this design also helps maintain the balance of the battery during charging and discharging, extending the battery's lifespan.

[0161] In one specific embodiment of this invention, the dimensions of the U-shaped positive electrode adapter 10 and negative electrode adapter 11 are defined in detail. These dimensions are designed to ensure the stability of the battery structure and the efficiency of current transmission.

[0162] Specifically, in the width direction of the wound cell 12 (i.e. Figure 9 In the L direction (as shown in the diagram), the lengths of both the positive electrode adapter 10 and the negative electrode adapter 11 are set to 30-120 mm. This length range was chosen considering several factors, including cell size, current transmission requirements, and overall battery compactness. Longer adapters provide more welding area, thus enhancing connection reliability; however, excessively long adapters may increase battery weight and volume, negatively impacting energy density. Therefore, selecting this length range ensures connection reliability while maintaining overall battery compactness.

[0163] Meanwhile, in the thickness direction of the wound cell 12 (i.e. Figure 9 In the T-direction (as shown in the diagram), the widths of both the positive electrode adapter 10 and the negative electrode adapter 11 are set to 20-50 mm. This width range is chosen considering both current transmission requirements and the stability of the battery structure. Wider adapters can provide a larger current path, reducing resistance and temperature rise; however, excessively wide adapters may increase manufacturing costs and hinder battery placement within a limited space. Therefore, selecting this width range ensures both current transmission efficiency and the economic efficiency and practicality of the battery structure.

[0164] In summary, the length and width of the U-shaped positive electrode adapter 10 and negative electrode adapter 11 have been carefully designed to ensure the stability of the battery structure and the efficiency of current transmission. These dimensions not only consider the battery's performance requirements but also manufacturing costs and practicality, providing a strong guarantee for the overall performance of the battery.

[0165] Understandably, the battery should also include necessary components such as a top cover, electrolyte, and aluminum casing. The specific function of these components is to ensure the normal operation of the battery's various functions. Given that these components have been implemented in existing technologies and are not the focus of this design, they will not be elaborated upon here.

[0166] Furthermore, although this application frequently uses terms such as wound cell, positive electrode, and negative electrode, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0167] This utility model provides a battery that optimizes the structural design of a multi-tab wound cell. Specifically, it optimizes the distribution of tabs of the same polarity during winding, so that the tabs of the same polarity are located on different sides of the thickness direction of the wound cell and are staggered. This not only reduces the width requirement of the wound cell, but also ensures that the distance between the tabs of the same polarity is large enough to avoid the problem of excessive local heat generation. In addition, it improves the high-rate charge and discharge performance of the battery, reduces the temperature rise during high-rate charge and discharge, and makes the current inside the battery more evenly distributed, thereby improving the electrical performance and safety of the battery.

[0168] Example 2

[0169] This utility model provides an electrical device, including the battery as described in Embodiment 1 above.

[0170] It should be noted that in this embodiment, the power-consuming device can be powered directly by a single battery, or it can be powered by a battery module formed by several batteries connected in parallel, series, or mixed.

[0171] The electrical device provided in this embodiment has good electrical performance and safety because it has the battery provided in Embodiment 1 above.

[0172] It is understandable that an electrical device, in addition to a battery for providing electrical energy, should also include an object that receives electrical energy, namely the electrical user. The battery is connected to the electrical user, and the electrical user can perform the set functions under the drive of electrical energy.

[0173] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A battery, characterized in that, The device includes a wound battery cell (12), which includes a positive electrode (1), a separator (2), a negative electrode (3), a first positive electrode tab (6), a second positive electrode tab (7), a first negative electrode tab (8), and a second negative electrode tab (9). In the thickness direction of the wound cell (12), the wound cell (12) has a first side and a second side disposed opposite to each other; the first positive electrode tab (6) and the second negative electrode tab (9) are located on the first side of the wound cell (12), and the second positive electrode tab (7) and the first negative electrode tab (8) are located on the second side of the wound cell (12); and the first positive electrode tab (6) and the second positive electrode tab (7) are disposed in a staggered manner, and the first negative electrode tab (8) and the second negative electrode tab (9) are disposed in a staggered manner; The first positive electrode ear (6) includes a plurality of stacked first positive electrode ears (41). The second positive electrode ear (7) includes a plurality of stacked second positive electrode ears (42); The first negative electrode ear portion (8) includes a plurality of stacked first negative electrode ears (51); The second negative electrode ear (9) includes a plurality of stacked second negative electrode ears (52); In the width direction of the positive electrode (1), the positive electrode (1) has a first side and a second side disposed opposite to each other; a plurality of first positive electrode tabs (41) are arranged at intervals on the first side of the positive electrode (1); A plurality of second positive tabs (42) are arranged at intervals on the first side of the positive electrode plate (1), and each second positive tab (42) is disposed adjacent to a corresponding first positive tab (41); In the width direction of the negative electrode sheet (3), the negative electrode sheet (3) has a first side and a second side disposed opposite to each other; a plurality of first negative electrode tabs (51) are arranged at intervals on the first side of the negative electrode sheet (3); A plurality of second negative electrode tabs (52) are arranged at intervals on the first side of the negative electrode sheet (3), and each second negative electrode tab (52) is disposed adjacent to a corresponding first negative electrode tab (51).

2. The battery according to claim 1, characterized in that, In the winding direction of the wound cell (12), the distance b1 between the first positive electrode lug (6) and the second positive electrode lug (7) which are arranged adjacent to each other is 5-60mm; In the winding direction of the wound cell (12), the distance b2 between the first negative electrode ear (8) and the second negative electrode ear (9) which are arranged adjacent to each other is 5-60mm.

3. The battery according to claim 1, characterized in that, In the width direction of the wound cell (12), the innermost ring of the wound cell (12) has a first end and a second end that are disposed opposite to each other; The distance c between the first side of the second positive electrode ear (7) and the first end of the innermost ring of the wound cell (12) is 5-12mm; the first side of the second positive electrode ear (7) is the side of the second positive electrode ear (7) that is close to the first end of the innermost ring of the wound cell (12); The distance d between the second side of the first negative electrode ear (8) and the second end of the innermost ring of the wound cell (12) is 5-12mm; the second side of the first negative electrode ear (8) is the side of the first negative electrode ear (8) that is close to the second end of the innermost ring of the wound cell (12); The distance e between the first side of the second positive electrode ear (7) and the first side of the first positive electrode ear (6) is 25-55mm; the first side of the first positive electrode ear (6) is the side closer to the second positive electrode ear (7); The distance f between the second side of the first negative electrode ear (8) and the second side of the second negative electrode ear (9) is 25-55mm; the second side of the second negative electrode ear (9) is the side closer to the first negative electrode ear (8); The distance g between the first side of the first positive electrode ear (6) and the second side of the second negative electrode ear (9) is 30-60 mm.

4. The battery according to claim 1, characterized in that, In the winding direction of the wound cell (12), the widths of the first positive electrode tab (41) and the second positive electrode tab (42) are the same; In the height direction of the wound cell (12), the first positive electrode tab (41) and the second positive electrode tab (42) are at the same height; In the winding direction of the wound cell (12), the width of the first negative electrode tab (51) and the second negative electrode tab (52) are the same, and the width of the first positive electrode tab (41) and the second positive electrode tab (42) is the same. In the height direction of the wound cell (12), the first negative electrode tab (51) and the second negative electrode tab (52) are at the same height, and are at the same height as the first positive electrode tab (41) and the second positive electrode tab (42).

5. The battery according to claim 4, characterized in that, It also includes a positive electrode adapter (10) and a negative electrode adapter (11). Both the positive electrode adapter (10) and the negative electrode adapter (11) are elongated strips; The length of the positive electrode adapter (10) extends along the width direction of the wound cell (12), and the positive electrode adapter (10) is located in the middle between the first positive electrode tab (6) and the second positive electrode tab (7); The first positive electrode ear (6) extends out from one side of the positive electrode adapter (10) in the width direction and is bent and welded to the positive electrode adapter (10); the width direction of the positive electrode adapter (10) is the same as the thickness direction of the wound cell (12); The second positive electrode ear (7) extends out from the other side of the width direction of the positive electrode adapter (10) and is bent and welded to the positive electrode adapter (10). The length of the negative electrode adapter (11) extends along the width direction of the wound cell (12), and the negative electrode adapter (11) is located in the middle between the first negative electrode ear (8) and the second negative electrode ear (9); The first negative electrode ear (8) extends out from one side of the negative electrode adapter (11) in the width direction and is bent and welded to the negative electrode adapter (11); the width direction of the negative electrode adapter (11) is the same as the thickness direction of the wound cell (12); The second negative electrode ear (9) extends out from the other side of the width direction of the negative electrode adapter (11) and is bent and welded to the negative electrode adapter (11).

6. The battery according to claim 1, characterized in that, In the winding direction of the wound cell (12), the widths of the first positive electrode tab (41) and the second positive electrode tab (42) are the same; In the height direction of the wound cell (12), the height of the first positive electrode tab (41) is greater than the height of the second positive electrode tab (42); In the winding direction of the wound cell (12), the widths of the first negative electrode tab (51) and the second negative electrode tab (52) are the same; In the height direction of the wound cell (12), the height of the second negative electrode tab (52) is greater than the height of the first negative electrode tab (51), and the height of the first negative electrode tab (51) is equal to the height of the second positive electrode tab (42), and the height of the second negative electrode tab (52) is equal to the height of the first positive electrode tab (41).

7. The battery according to claim 6, characterized in that, It also includes a positive electrode adapter (10) and a negative electrode adapter (11). Both the positive electrode adapter (10) and the negative electrode adapter (11) are elongated strips; The length of the positive electrode adapter (10) extends along the width direction of the wound cell (12), and the positive electrode adapter (10) is located between the first positive electrode ear (6) and the second positive electrode ear (7), and is disposed close to the second positive electrode ear (7); The first positive electrode ear (6) extends out from one side of the positive electrode adapter (10) in the width direction and is bent and welded to the positive electrode adapter (10); the width direction of the positive electrode adapter (10) is the same as the thickness direction of the wound cell (12); The second positive electrode ear (7) extends out from the other side of the width direction of the positive electrode adapter (10) and is bent and welded to the positive electrode adapter (10). The length of the negative electrode adapter (11) extends along the width direction of the wound cell (12), and the negative electrode adapter (11) is located between the first negative electrode ear (8) and the second negative electrode ear (9), and is disposed close to the first negative electrode ear (8). The first negative electrode ear (8) extends out from one side of the negative electrode adapter (11) in the width direction and is bent and welded to the negative electrode adapter (11); the width direction of the negative electrode adapter (11) is the same as the thickness direction of the wound cell (12); The second negative electrode ear (9) extends out from the other side of the width direction of the negative electrode adapter (11) and is bent and welded to the negative electrode adapter (11).

8. The battery according to claim 6, characterized in that, The number of the wound cells (12) is two; The two wound cells (12) are stacked in the thickness direction and arranged in a mirror-symmetrical manner; It also includes a positive electrode adapter (10) and a negative electrode adapter (11). The positive electrode adapter (10) is U-shaped and includes a first positive electrode welding section (101) and a second positive electrode welding section (102) arranged symmetrically on the left and right, as well as a positive electrode connection section (103) connecting the first positive electrode welding section (101) and the second positive electrode welding section (102). The length of the first positive electrode welding section (101) extends along the width direction of one of the wound cells (12), and the first positive electrode welding section (101) is located between the first positive electrode tab (6) and the second positive electrode tab (7) of one of the wound cells (12), and is disposed close to the second positive electrode tab (7); the first positive electrode tab (6) extends out from one side of the width direction of the first positive electrode welding section (101) and is bent and welded to the first positive electrode welding section (101); the second positive electrode tab (7) extends out from the other side of the width direction of the first positive electrode welding section (101) and is bent and welded to the first positive electrode welding section (101). The length of the second positive electrode welding section (102) extends along the width direction of the other wound cell (12), and the second positive electrode welding section (102) is located between the first positive electrode tab (6) and the second positive electrode tab (7) of the other wound cell (12), and is disposed close to the second positive electrode tab (7); the first positive electrode tab (6) protrudes from one side of the width direction of the second positive electrode welding section (102) and is bent and welded to the second positive electrode welding section (102); the second positive electrode tab (7) protrudes from the other side of the width direction of the second positive electrode welding section (102) and is bent and welded to the second positive electrode welding section (102). The negative electrode adapter (11) is U-shaped and includes a first negative electrode welding section (111) and a second negative electrode welding section (112) arranged symmetrically on the left and right, as well as a negative electrode connection section (113) connecting the first negative electrode welding section (111) and the second negative electrode welding section (112). The length of the first negative electrode welding section (111) extends along the width direction of one of the wound cells (12), and the first negative electrode welding section (111) is located between the first negative electrode lug (8) and the second negative electrode lug (9) of one of the wound cells (12), and is disposed close to the first negative electrode lug (8); the first negative electrode lug (8) extends out from one side of the width direction of the first negative electrode welding section (111) and is bent and welded to the first negative electrode welding section (111); the second negative electrode lug (9) extends out from the other side of the width direction of the first negative electrode welding section (111) and is bent and welded to the first negative electrode welding section (111). The length of the second negative electrode welding section (112) extends along the width direction of the other wound cell (12), and the second negative electrode welding section (112) is located between the first negative electrode ear (8) and the second negative electrode ear (9) of the other wound cell (12), and is disposed close to the first negative electrode ear (8); the first negative electrode ear (8) protrudes from one side of the width direction of the second negative electrode welding section (112) and is bent and welded to the second negative electrode welding section (112); the second negative electrode ear (9) protrudes from the other side of the width direction of the second negative electrode welding section (112) and is bent and welded to the second negative electrode welding section (112).

9. The battery according to claim 8, characterized in that, In the width direction of the wound cell (12), the lengths of the positive electrode adapter (10) and the negative electrode adapter (11) are both 30-120 mm; In the thickness direction of the wound cell (12), the width of the positive electrode adapter (10) and the negative electrode adapter (11) is 20-50mm.

10. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1-9.

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