Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and the battery comprises a housing which is provided with an opening; the cover plate assembly comprises a cover plate and a first connecting piece connected to one side of the cover plate, and the cover plate covers the opening; the naked battery cell is positioned in the shell, and the naked battery cell comprises a battery cell body and a first tab; the first tab comprises a first connecting part, a first bending part, a transition part, a second bending part and a first fixing part which are sequentially connected in the height direction of the naked battery cell, the first connecting part is connected with the battery cell body, and the first fixing part is connected with the first connecting piece; the first bending part and the second bending part are both bent along a first direction, and the bending direction of the first bending part is opposite to the bending direction of the second bending part; the first direction is the thickness direction of the battery cell body. Therefore, the first tab is bent, so that the tab is prevented from being inserted into the battery core body in the core combining process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and a power consumption device. BACKGROUND

[0002] In the related art, the positive tab of a bare cell (or winding body) includes a plurality of sub-tabs stacked. Each sub-tab has a large thickness. After the bare cell completes the welding and cell combining process, the inner sub-tab of the positive tab near the center of the bare cell has a redundant portion. During the process of the bare cell being loaded into the shell and being extruded, the redundant portion of the sub-tab is easily moved downward under the pressure from the upper cover assembly. If the sub-tab is inserted into the interior of the bare cell and contacts the tab, it is likely to cause a short circuit. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to provide a battery and a power consumption device to at least partially solve the problem of battery short circuit caused by the insertion of a sub-tab.

[0004] To achieve the above purpose, the first aspect of the present application provides a battery, comprising:

[0005] a shell formed with an opening;

[0006] a cover assembly including a cover and a first connecting piece connected to one side of the cover, the cover covering the opening;

[0007] a bare cell located in the shell, the bare cell including a cell body and a first tab; the first tab includes a first connecting portion, a first bending portion, a transition portion, a second bending portion and a first fixing portion connected in sequence along the height direction of the bare cell, the first connecting portion is connected with the cell body, the first fixing portion is connected with the first connecting piece, the first bending portion and the second bending portion are both bent along a first direction, and the bending direction of the first bending portion and the bending direction of the second bending portion are opposite; the first direction is the thickness direction of the cell body.

[0008] Optionally, the first tab includes a plurality of first sub-tabs stacked, and the spacing between any two adjacent first sub-tabs located at the transition portion gradually decreases from the first bending portion to the second bending portion.

[0009] Optionally, the first connecting portion and the transition portion are spaced apart along a second direction, and the first fixing portion and the transition portion are spaced apart along the second direction; the second direction is the height direction of the bare cell.

[0010] Optionally, the orthographic projection of the first fixing portion along the second direction partially overlaps the transition portion.

[0011] Optionally, the bending direction of the second bending portion is towards the side wall of the shell body close to the side of the cell body.

[0012] Optionally, the first tab is a positive electrode tab.

[0013] Optionally, the cover plate assembly comprises a second connecting sheet connected to the cover plate, the bare cell comprises a second tab, the second tab comprises a second connecting portion, a third bending portion and a second fixing portion connected in sequence along the height direction of the bare cell, the second connecting portion is connected with the cell body, the second fixing portion is connected with the second connecting sheet, and the third bending portion is bent along the first direction; the second tab is a negative electrode tab.

[0014] Optionally, the first tab comprises a plurality of first sub-tabs stacked along the first direction; the second tab comprises a plurality of second sub-tabs stacked along the first direction, and the length of the first sub-tab close to the shell body is greater than the length of the second sub-tab close to the shell body.

[0015] Optionally, the cell body comprises a plurality of pole pieces stacked, and the pole piece close to the shell body along the first direction is connected with the first sub-tab or the second sub-tab.

[0016] The second aspect of the present application also provides a power utilization device comprising the battery of the first aspect.

[0017] Through the above technical solution, the first tab has the first bending portion and the second bending portion, and the bending direction of the first bending portion is opposite to the bending direction of the second bending portion. Through the design form of the two bending portions, the first tab can better disperse the bending stress during the cell combining process of the bare cell, so that the first tab is not prone to excessive deformation or extrusion, ensuring that the overall structure of the first tab is more stable, thereby reducing the possibility of the first tab exploring towards the inside of the cell body, avoiding the contact between the first tab and the pole piece in the cell body, and further preventing the short circuit problem, which helps to improve the safety and reliability of the battery.

[0018] At the same time, the transition portion arranged between the first bending portion and the second bending portion can ensure smooth transition of the first tab during the bending process, so that the stress of the bending area can be smoothly distributed, avoiding the situation of stress concentration.

[0019] Other features and advantages of the present application will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0021] Figure 1 is a welding schematic diagram of the first bare battery cell provided in the exemplary embodiments of the present application;

[0022] Figure 2 is a cell combining schematic diagram of the first bare battery cell provided in the exemplary embodiments of the present application;

[0023] Figure 3 is a packaging schematic diagram of the first bare battery cell provided in the exemplary embodiments of the present application;

[0024] Figure 4 is a three-dimensional schematic diagram of the second battery provided in the exemplary embodiments of the present application;

[0025] Figure 5 is a partial schematic diagram of the first tab of the second battery provided in the exemplary embodiments of the present application; Figure 4

[0026] Figure 6 is a welding schematic diagram of the first tab of the second battery provided in the exemplary embodiments of the present application;

[0027] Figure 7 is a cell combining schematic diagram of the second battery provided in the exemplary embodiments of the present application;

[0028] Figure 8 is a packaging schematic diagram of the second battery provided in the exemplary embodiments of the present application;

[0029] Figure 9 is a partial schematic diagram of the first tab of the second battery provided in the exemplary embodiments of the present application; Figure 4

[0030] Explanation of reference signs

[0031] 1 - cover plate assembly; 101 - cover plate; 102 - connecting piece; 1021 - first connecting piece; 1022 - second connecting piece; 103 - first pole; 104 - second pole;

[0032] ​​2 - bare cell; 201 - cell body; 202 - first tab; 2021 - first connecting part; 2022 - first bending part; 2023 - transition part; 2024 - second bending part; 2025 - first fixing part; 2026 - first sub-tab; 203 - second tab; 2031 - second connecting part; 2032 - third bending part; 2033 - second fixing part; 2034 - second sub-tab; 204 - tab; 2041 - sub-tab; 205 - welding mark;

[0033] 3 - shell;

[0034] 4 - split type adhesive head; 401 - first adhesive head; 402 - second adhesive head;

[0035] 5 - adhesive tape. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] It should be noted that the relative arrangement of the components, numerical expressions and values set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0038] Meanwhile, it should be understood that the sizes of the various portions shown in the drawings are not drawn in proportion to the actual proportions.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application or its applications or uses.

[0040] It should be noted that unless otherwise defined, technical or scientific terms used in the present application should be understood according to the common meaning of those terms for a person having ordinary skill in the art to which the present application pertains. The terms "first", "second" and similar terms used in the present application do not denote any order, quantity or importance, but are merely used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0041] As Figure 1 , Figure 1The first bare cell 2 welding schematic diagram is shown, in some embodiments, the bare cell 2 includes a cell body 201 and a tab 204 extending from the cell body 201, the tab 204 includes a plurality of stacked sub-tabs 2041, and the cell body 201 includes a plurality of stacked tabs, and the sub-tab 2041 is connected to the corresponding tab. During welding (such as ultrasonic welding), the stacked sub-tab 2041 is extruded by the welding equipment, especially the protective cover plate, so that the sub-tab 2041 far away from the cover plate assembly 1 in the vertical direction (i.e. the upper sub-tab 2041) will be bent downward after being extruded, and the bent part will form a material redundancy.

[0042] As Figure 2 , Figure 2 The schematic diagram of the bare cell 2 cell combining process is shown, after the bare cell 2 is combined, the lower sub-tab 2041 during welding is located on the outside (i.e. the side away from the two bare cells 2), and the upper sub-tab 2041 is located on the inside. The tab 204 will be bent under the action of external force and gathered towards the outside, forming a "C" type arc-shaped redundant area. Among them, the "C" type arc-shaped redundant area is specifically manifested as that the distance from the root of the sub-tab 2041 on the outside (i.e. the end of the sub-tab 2041 connected to the cell body 201) to the welding mark 205 is shorter; and the farther the sub-tab 2041 is inside, the longer the distance from the root to the welding mark 205. When the cell is turned over, the extrusion force of the sub-tab 2041 on the inside will extend to the outside, when the thickness of the sub-tab 2041 is large, the extrusion force of the sub-tab 2041 on the inside will force the outer sub-tab 2041 to break or be in a state of tension, which is easy to be torn by external force in the subsequent process.

[0043] In the assembly process of the cell, especially in the cell combining and bare cell 2 into the shell process, the tab 204 will be subjected to a large bending stress, which comes from the extrusion force of the external assembly equipment. Specifically, as Figure 3 , Figure 3The schematic diagram of the battery cell packaging is shown. During the battery cell packaging, the cover plate 101 or the connecting piece 102 in the cover plate assembly 1 will apply an extrusion force to the tab 204. When the tab 204 is a positive tab, due to the large thickness of the sub-tab 2041 used to form the positive tab, the vertical free space between the connecting piece 102 and the battery cell body 201 is relatively small. The arc-shaped redundant area of ​​the positive tab may be deformed under the extrusion of the cover plate 101 or the connecting piece 102 and move toward the battery cell body 201 below (or downward). At this time, if the positive tab is inserted into the interior of the battery cell body 201, it may come into contact with the electrode sheets of different polarity, thereby causing a short circuit problem; this is a serious safety hazard in battery production. Short circuit will not only reduce the working performance of the battery cell, but may also cause thermal runaway, leading to overheating or fire of the battery cell.

[0044] In order to avoid the above problems, Figure 4 , Figure 4 A perspective schematic diagram of a second type of battery is shown. In some embodiments, the battery includes a housing 3 and a cover assembly 1. The housing 3 has an opening. The cover assembly 1 includes a cover 101 and a first electrode 103 and a second electrode 104 connected to the cover 101. For example, one of the first electrode 103 and the second electrode 104 can serve as the positive electrode, while the other serves as the negative electrode. The cover 101 covers the opening, forming a relatively enclosed space within the housing 3.

[0045] like Figure 5 , Figure 5 Shown Figure 4 In the schematic cross-sectional view of the AA section, the cover assembly 1 further includes a first connecting piece 1021 connected to one side of the cover 101. The bare cell 2 is located in the housing 3 and includes a cell body 201 and a first tab 202.

[0046] like Figure 6 , Figure 6 A partial schematic diagram of the first tab of the second battery is shown. The first tab 202 includes a portion of the first tab 202 along the height direction of the bare battery cell 2 (eg Figure 6 The first connecting portion 2021, the first bending portion 2022, the transition portion 2023, the second bending portion 2024 and the first fixing portion 2025 are connected in sequence, the first connecting portion 2021 is connected to the battery cell body 201, the first fixing portion 2025 is connected to the first connecting piece 1021, the first bending portion 2022 and the second bending portion 2024 are both along the first direction (such as Figure 6 The first bending portion 2022 is bent in the X direction, and the bending direction of the first bending portion 2022 is opposite to the bending direction of the second bending portion 2024; the first direction is the thickness direction of the battery cell body 201.

[0047] Exemplarily, the opening of the shell 3 is used for the bare battery cell 2 to pass through and be mounted inside the shell 3.

[0048] Exemplarily, the first pole post 103 passes through the cover plate 101, one end of which is located outside the cover plate 101 (i.e., protrudes upwardly out of the cover plate 101) for electrical connection with an external circuit; the other end is located inside the cover plate 101 (i.e., inside the shell 3) for connection with the first connecting sheet 1021 by welding, riveting, bonding or one-piece forming connection and the like.

[0049] Reference Figure 6 As shown, the first bending part 2022, the transition part 2023 and the second bending part 2024 are integrally configured in an S shape. The S-shaped first tab 202 can significantly improve the stability of the battery cell body 201 during welding and cell combining, reduce the short circuit problem caused by deformation of the first tab 202, and improve the safety and reliability of the battery.

[0050] Among them, the bending direction of the second bending part 2024 is towards the side wall of the shell 3 close to the battery cell body 201, and the bending direction of the first bending part 2022 is opposite to that of the second bending part 2024, that is, the opposite bending directions can enhance the mechanical stability of the battery cell, reduce the stress concentration and possible fatigue damage of the two bending parts of the first tab 202, thereby reducing the probability of mechanical damage during assembly and use, prolonging the service life of the battery cell. At the same time, the bending direction of the first bending part 2022 is opposite to that of the second bending part 2024, so that the packaging process of the battery cell body 201 is more efficient, the misplacement or interference problem of the first tab 202 during the process of the battery cell body 201 into the shell is reduced, and the production efficiency and assembly quality of the battery are improved.

[0051] Through the above technical solution, the first tab 202 has the first bending part 2022 and the second bending part 2024, and the bending direction of the first bending part 2022 is opposite to that of the second bending part 2024. The first tab 202 can better disperse bending stress during the cell combining process of the bare battery cell 2, so that the first tab 202 is not easy to deform or be extruded excessively, ensuring that the overall structure of the first tab 202 is more stable, thereby reducing the possibility of the first tab 202 probing into the inside of the battery cell body 201, improving the safety and reliability of the battery. At the same time, the transition part 2023 arranged between the first bending part 2022 and the second bending part 2024 can ensure smooth transition of the first tab 202 during bending, so that the stress of the bending area can be smoothly distributed, avoiding the occurrence of stress concentration.

[0052] As Figure 7 , Figure 7The welding schematic of the first tab 202 is shown, the first tab 202 includes a plurality of first sub-tabs 2026 arranged in a stack, and the plurality of first sub-tabs 2026 need to be welded to one side surface of the cover plate assembly 1 (for example, the surface of the first connecting sheet 1021) to form the first tab 202 connected with the cover plate assembly 1.

[0053] In order to make the first tab 202 form the above structure, as shown in Figure 7 When welding the first tab 202, a split type adhesive head 4 is needed, the split type adhesive head 4 includes a first adhesive head 401 and a second adhesive head 402, the first adhesive head 401 is used to support the battery body 201, and the second adhesive head 402 is used to support the cover plate assembly 1 and the plurality of first sub-tabs 2026 above the cover plate assembly 1. The height of the supporting surface (i.e. the upper surface) of the first adhesive head 401 is less than the height of the supporting surface of the second adhesive head 402, and the height difference a between the two supporting surfaces can be 1.2mm, so that the height difference b between the lower surface of the battery body 201 in the flat state (as shown in Figure 7 ) and the lower surface of the first tab 202 in the flattened state (as shown in Figure 7 ) is 2mm. At this time, whether it is the upper first sub-tab 2026 or the lower first sub-tab 2026, a bending will occur, and accordingly a length redundancy will also occur, avoiding the first sub-tab 2026 being in a tensioned state, while ensuring that the first tab 202 can form an S-shaped structure after the cell is combined, and also effectively improving the problem that the first sub-tab 2026 is easily torn by external force.

[0054] It should be further pointed out that the split type adhesive head 4 is also provided with an adhesive tape 5, the adhesive tape 5 extends from the supporting surface of the first adhesive head 401 to the supporting surface of the second adhesive head 402, and the whole is Z-shaped.

[0055] After welding and cell combination is completed, in order to make the first tab 202 maintain the S-shaped structure, a horizontal shell entering process can be adopted in the shell entering process. As shown in Figure 8 , Figure 8 The shell entering process schematic of the battery is shown, the shell 3 is in a horizontal manner, and the opening of the shell 3 faces one side. The bare battery cell 2 and the cover plate assembly 1 after welding are pushed into the shell 3 horizontally through the opening. During the pushing process, since the first tab 202 is located on one side of the battery body 201, the vertical downward gravity G of the battery body 201 will not act on the first tab 202, which can prevent the first tab 202 from being straightened by the gravity G of the battery body 201, and can make the first tab 202 maintain the S-shaped structure during the assembly process.

[0056] In some embodiments, reference is made to Figure 6As shown, the interval between any two adjacent first sub-tab 2026 located at the transition portion 2023 gradually decreases from the first bending portion 2022 to the second bending portion 2024.

[0057] When the first tab 202 undergoes mechanical processing procedures such as bending and welding, the structure of the first tab 202 will be subjected to a large mechanical stress, especially in the area of the transition portion 2023. By gradually reducing the interval between any two adjacent first sub-tab 2026 from the first bending portion 2022 to the second bending portion 2024, the first sub-tab 2026 can evenly disperse stress when bending, avoiding stress concentration in a single part of the first sub-tab 2026, reducing the risk of damage to the first sub-tab 2026, and reducing the damage, fracture or fatigue phenomenon of the first sub-tab 2026 during the bending process.

[0058] The transition portion 2023 is located between the first bending portion 2022 and the second bending portion 2024, and plays a transition role, which can effectively avoid the misalignment or mismatch between the first sub-tab 2026 and the electrodes of each level in the battery body 201 after bending. At the same time, by gradually reducing the interval between any two adjacent first sub-tab 2026 from the first bending portion 2022 to the second bending portion 2024, the plurality of first sub-tab 2026 can maintain a relatively uniform arrangement after bending.

[0059] In some embodiments, referring to Figure 5 and Figure 6 As shown, the second direction is the height direction of the bare battery cell 2, wherein the first connecting portion 2021 and the transition portion 2023 are spaced apart along the second direction, and the first fixing portion 2025 and the transition portion 2023 are spaced apart along the second direction.

[0060] By spacing the first connecting portion 2021, the first fixing portion 2025 and the transition portion 2023 in the second direction, the longitudinal space inside the shell 3 can be reasonably utilized, and the overall layout can be optimized. That is, when the bare battery cell 2 is combined, the first connecting portion 2021, the first fixing portion 2025 and the transition portion 2023 are respectively at different position heights, which can make the first tab 202 evenly distribute the longitudinal stress, avoid excessive local stress concentration, and in the process of the battery cell entering the shell, the first tab 202 will be extruded by the cover plate assembly 1, and the interval between the first connecting portion 2021 and the transition portion 2023 and the interval between the first fixing portion 2025 and the transition portion 2023 can play a buffering transition role, effectively avoiding the contact between the first tab 202 and the electrode tab of the battery body 201.

[0061] In addition, the first connecting portion 2021, the first fixing portion 2025, and the transition portion 2023 are spaced apart along the second direction, and more heat dissipation channels or spaces can be created for the bare battery cell 2 in the shell 3, effectively avoiding the local heat accumulation of the first tab 202, and the heat energy can be more easily dissipated to the external environment by improving the heat conduction efficiency, thereby prolonging the service life of the bare battery cell 2 and improving the safety of the battery.

[0062] In some embodiments, referring to Figure 6 , the first fixing portion 2025 is partially overlapped with the transition portion 2023 in the orthographic projection of the first fixing portion 2025 along the second direction.

[0063] When the first tab 202 is pressed by the cover plate assembly 1, the first fixing portion 2025 starts to move downward under the downward pressure, and at this time, the transition portion 2023 first contacts the first tab 202. Under the buffering action of the transition portion 2023, the first fixing portion 2025 will not contact the positive and negative pole pieces of the battery cell body 201 due to the interposition, and the situation that the first tab 202 contacts the positive and negative pole pieces of the battery cell body 201 and causes a short circuit can be effectively avoided.

[0064] In some embodiments, referring to Figure 6 , the bending direction of the second bending portion 2024 is toward the side wall of the shell 3 close to the battery cell body 201.

[0065] In combination with Figure 7 , based on the welding mode of the first tab 202 and the first connecting piece 1021, the second bending portion 2024 is arranged to be bent outward, and correspondingly, the first bending portion 2022 is arranged to be bent inward, so that the relative position relationship between the S-shaped structure of the first tab 202 as a whole and the welding mark 205 is more reasonable, which helps to reduce the welding difficulty and the difficulty of assembling into the shell, and is beneficial to mass production.

[0066] In some embodiments, the same end surface of the battery cell body 201 has a positive pole lug and a negative pole lug, as shown in Figure 5 , the first tab 202 is a positive pole lug.

[0067] In this embodiment, the first tab 202 is connected with the first pole 103 through the first connecting piece 1021, and the first pole 103 serves as a positive pole of the battery.

[0068] As shown in Figure 9 , Figure 9 , a cross-sectional view of B-B section in Figure 4 is shown, the cover plate assembly 1 includes a second connecting piece 103 connected to the cover plate 101, and the bare battery cell 2 includes a second tab 203, which is a negative pole lug.

[0069] The second tab 203 is connected with the second pole 104 through the second connecting piece 1022, and the second pole 104 serves as a negative pole of the battery.

[0070] It should be noted that the connection mode of the second connecting piece 1022 and the second pole 104 is the same as that of the first connecting piece 1021 and the first pole 103, which will not be described here.

[0071] The positive tab is generally made of aluminum or aluminum alloy, so that the positive tab has good electrical conductivity, lightweight and oxidation resistance, and is suitable for matching the electrochemical properties of the positive material; the negative tab is usually made of copper or nickel-plated copper, so that the negative tab has excellent electrical conductivity and mechanical strength. Therefore, based on factors such as material properties, when the cover plate assembly 1 extrudes the first tab 202 and the second tab 203, if the bending parts of the first tab 202 and the second tab 203 are both C-shaped at this time, the probability of the C-shaped arc-shaped redundant area of the first tab 202 descending into the inside of the battery body 201 is greater. In order to improve the safety of the battery, the overall profile structure of the first tab 202 and the overall profile structure of the second tab 203 can both be S-shaped. Similarly, when the overall profile structure of the second tab 203 is S-shaped, the second tab 203 has all the beneficial effects of the first tab 202 described above, which will not be described here.

[0072] In some embodiments, in order to reduce the manufacturing cost of the battery, based on the materials and foil thickness characteristics of the positive tab and the negative tab respectively selected, as shown in Figure 9 As shown in FIG. 6, the overall profile structure of the second tab 203 as the negative tab can be C-shaped. At this time, the cross-sectional structure of the first sub-tab 2026 located on the same end face of the battery body 201 is S-shaped, and the cross-sectional structure of the second sub-tab 2034 is C-shaped.

[0073] When the battery body 201 is encapsulated, the first tab 202 and the second tab 203 need to withstand a certain extrusion force, especially when the cover plate assembly 1 extrudes the first tab 202 and the second tab 203, the S-shaped bending of the first tab 202 can better disperse the extrusion force in the encapsulation process; and based on the material and foil thickness characteristics of the negative tab itself, the C-shaped bending of the second tab 203 can also withstand the extrusion under the premise of ensuring its normal work through its strong mechanical properties.

[0074] Specifically, in some embodiments, as shown in Figure 9As shown, the second tab 203 includes a second connecting portion 2031, a third bending portion 2032 and a second fixing portion 2033 connected in sequence along the second direction. The second connecting portion 2031 is connected with the negative plate in the battery body 201, and the second fixing portion 2033 is connected with the second connecting sheet 1022. The third bending portion 2032 effectively disperses the mechanical stress at the bending position of the tab, reduces the probability of the second tab 203 contacting the positive and negative plates in the battery body 201, and avoids stress concentration in a certain position, thereby reducing the risk of tab rupture or damage due to mechanical fatigue or external force.

[0075] In some embodiments, the material selection and structural design of the first tab 202 and the second tab 203 are crucial to the thermal management performance of the battery. The second tab 203 is usually made of copper material with high conductivity, which can effectively conduct current and reduce resistance heat during battery charging and discharging. The first tab 202 is usually made of aluminum or aluminum alloy material, which has good chemical stability and can reduce tab corrosion and heat accumulation caused by electrochemical reaction.

[0076] In some embodiments, referring to Figure 9 As shown, the second tab 203 is composed of a plurality of second sub-tabs 2034 stacked along the first direction. The length of the first sub-tab 2026 close to the shell 3 is greater than the length of the second sub-tab 2034 close to the shell 3.

[0077] Based on the different materials of the first tab 202 and the second tab 203, and the different overall contour structures of the first tab 202 and the second tab 203, the length of the first sub-tab 2026 and the length of the second sub-tab 2034 are designed separately, which can make the bending and arrangement of the first tab 202 and the second tab 203 more flexible, and help to arrange the first tab 202 and the second tab 203 reasonably in the limited packaging space.

[0078] In some embodiments, the battery body 201 includes a plurality of plates stacked and arranged. The plate close to the shell 3 of the battery body 201 is connected with the first sub-tab 2026 or the second sub-tab 2034.

[0079] In the battery of the present embodiment, at least the outermost plate of the battery body 201 is connected with the first sub-tab 2026 or the second sub-tab 2034. In this way, the first tab 202 can be configured as an S-shaped structure, and the second tab 203 can be configured as a C-shaped structure, so that the first tab 202 and the second tab 203 can achieve the above technical effects.

[0080] On the basis of the above technical solutions, the second aspect of the present application further provides a power utilization device comprising the battery of the first aspect or any embodiment of the first aspect. The power utilization device can be, for example, a new energy vehicle, an electric bicycle, an electric motorcycle, a drone, an industrial robot, etc., and has all the beneficial effects of the battery described above, which will not be repeated here.

[0081] Each of the embodiments in the present application is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0082] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles and practical application of the present application, and to enable those of ordinary skill in the art to understand the present application so as to design various embodiments with various modifications for specific purposes.

[0083] Those of ordinary skill in the art should understand that the discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the present application is limited to these examples; the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes to the aspects of the present application as described above. In order to be brief, they are not provided in detail.

[0084] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those of ordinary skill in the art in the light of the foregoing description.

[0085] The embodiments of the present application are intended to cover all such alternatives, modifications and variations which fall within the broad scope of the present application. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized by, The battery comprises: a shell formed with an opening; a cover plate assembly comprising a cover plate and a first connecting plate connected to one side of the cover plate, the cover plate covering the opening; a bare cell located in the shell, the bare cell comprising a cell body and a first tab, the first tab comprising a first connecting portion, a first bending portion, a transition portion, a second bending portion and a first fixing portion connected in sequence along the height direction of the bare cell, the first connecting portion being connected with the cell body, the first fixing portion being connected with the first connecting plate, the first bending portion and the second bending portion being bent in a first direction, and the bending direction of the first bending portion being opposite to the bending direction of the second bending portion; the first direction being the thickness direction of the cell body.

2. The battery of claim 1, wherein, The first tab comprises a plurality of first sub-tabs arranged in layers, and the spacing between any two adjacent first sub-tabs located at the transition portion gradually decreases from the first bending portion to the second bending portion.

3. The battery of claim 2, wherein, The first connecting portion and the transition portion are spaced apart in a second direction, and the first fixing portion and the transition portion are spaced apart in the second direction; the second direction being the height direction of the bare cell.

4. The battery of claim 2, wherein, The orthographic projection of the first fixing portion in the second direction partially overlaps the transition portion.

5. The battery of claim 1, wherein, The bending direction of the second bending portion is towards the side wall of the shell close to the cell body.

6. The battery of claim 1, wherein, The first tab is a positive tab.

7. The battery of claim 1, wherein, The cover plate assembly comprises a second connecting plate connected to the cover plate, the bare cell comprises a second tab, the second tab comprises a second connecting portion, a third bending portion and a second fixing portion connected in sequence along the height direction of the bare cell, the second connecting portion being connected with the cell body, the second fixing portion being connected with the second connecting plate, and the third bending portion being bent in the first direction; The second tab is a negative tab.

8. The battery of claim 7, wherein, The first tab comprises a plurality of first sub-tabs arranged in layers along the first direction; the second tab comprises a plurality of second sub-tabs arranged in layers along the first direction, and the length of the first sub-tab close to the shell is greater than the length of the second sub-tab close to the shell.

9. The battery of claim 8, wherein, The cell body comprises a plurality of pole pieces arranged in layers, and the pole piece close to the shell along the first direction is connected with the first sub-tab or the second sub-tab.

10. An electrical device, characterized by The battery comprises the battery as claimed in any one of claims 1 to 9.

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