Battery cell, battery device, and electric device

Abstract

This application discloses a battery cell, a battery device, and a power-consuming device. The battery cell includes a casing and an electrode assembly. The electrode assembly includes multiple stacked electrode sheets adapted to be wound around an axis in a first direction to construct a wound battery cell. The electrode assembly also includes a full tab connected to the electrode sheets in the first direction. In a second direction, the full tab has an inlet end and a outlet end. The side of the outlet end in the second direction is a first side. In the direction from the electrode sheet to the full tab, at least a portion of the first side is inclined towards the inlet end, forming a first inclined side. The battery cell of this application can reduce the risk of contact between the cathode tab and the anode tab, thereby reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and extending the service life of the battery cell.

Description

Technical Field

[0001] This application relates to the field of electronic battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0002] For a wound cell with multiple tabs, under the mechanical force of flattening, the tabs on the outer ring, located at the edge of the wound cell, are inserted into the gap between the casing and the wound cell due to the inertia of the flattening action. As the flattening process progresses, the insertion depth increases, eventually breaking through the radial isolation space between the cathode and anode in the wound cell, causing the cathode tab and anode tab to overlap and contact.

[0003] Once the cathode and anode tabs are connected, an additional conductive path is formed inside the battery. From an electrochemical perspective, even if the battery is in a quiescent state without an external load, the anode has a low potential and is rich in electrons, while the cathode has a high potential. Driven by the potential difference, electrons will spontaneously flow from the anode to the cathode through the connection point. This causes the active materials of the positive and negative electrodes inside the battery to continuously undergo electrochemical reactions and consume electricity even without external power demand, thereby accelerating battery capacity decay and affecting battery safety and lifespan. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, one object of this application is to provide a battery cell that can reduce the risk of contact between the cathode and anode tabs.

[0005] One objective of this application is to provide a battery device.

[0006] One object of this application is to provide an electrical device.

[0007] According to a first aspect embodiment of this application, a battery cell includes a housing and an electrode assembly. The electrode assembly includes a plurality of stacked electrodes adapted to be wound around an axis in a first direction to form a wound cell. The electrode assembly also includes a full tab connected to the electrodes in the first direction. In a second direction, the full tab has an inlet end and a outlet end. The outlet end has a first side on its side in the second direction. In the direction from the electrodes to the full tab, at least a portion of the first side has an inclined side that is inclined toward the inlet end. The first direction and the second direction are perpendicular to each other.

[0008] In the above example, by setting a first bevel at the end, during the flattening process, the end of the full tab can be prevented from being inserted along the gap between the casing and the wound cell, or the insertion depth of the end of the full tab along the gap between the casing and the wound cell can be reduced. This reduces the risk of the full tab breaking through the radial isolation space between the cathode and anode in the wound cell, causing the cathode tab and anode tab to overlap and contact, thereby reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and helping to extend the service life of the battery cell.

[0009] In some embodiments of this application, in the projection plane perpendicular to the second direction, the projection length H1 of the first hypotenuse satisfies: 7mm≤H1≤12mm.

[0010] In the above example, when the projected length of the first inclined side is within the aforementioned range, the insertion depth of the end of the full tab along the gap between the casing and the wound cell can be effectively reduced during the flattening process. By reasonably controlling this length, the full tab is less likely to break through the radial isolation space between the cathode and anode in the wound cell, reducing the risk of contact between the cathode and anode tabs, thereby significantly reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and extending its service life.

[0011] In some embodiments of this application, in the projection plane perpendicular to the first direction, the projection length of the first hypotenuse is W1, and satisfies: 1 / 10≤H1 / W1≤3.

[0012] In the above example, when the projected length of the first hypotenuse satisfies the aforementioned relationship, the structural morphology of the full tab can be optimized. During the flattening process, the insertion trajectory of the full tab along the gap between the casing and the wound cell can be better controlled, avoiding excessive insertion or positional deviation due to proportional imbalance. This effectively prevents the cathode and anode tabs from overlapping, thereby significantly reducing the risk of internal short circuits, stabilizing the battery's charge and discharge performance, reducing energy loss and capacity decay, greatly improving the reliability and safety of individual battery cells, and extending their service life.

[0013] In some embodiments of this application, the tilt angle a1 of the first hypotenuse satisfies: 2°≤a1<90°.

[0014] In the above example, when the tilt angle of the first inclined side satisfies the above relationship, the structural morphology of the full tab can be optimized better, and the insertion direction and depth of the full tab along the gap between the shell and the wound cell can be effectively guided during the flattening operation, preventing it from going too deep and breaking through the isolation space between the cathode and the anode, thereby reducing the risk of contact between the cathode tab and the anode tab.

[0015] In some embodiments of this application, the side of the feed end in the second direction is called the second side, and in the direction from the electrode sheet to the tab, at least a portion of the second side is inclined toward the tail end as the second inclined side.

[0016] In the above example, by constructing beveled edges at both the feed end and the tail end of the full electrode, the feed end and the tail end of the full electrode are shortened, thereby reducing the bending insertion depth of the full electrode at the feed end and the tail end. This reduces the risk of the cathode and anode electrodes lapping and contacting each other at the feed end. Furthermore, the feed end of the full electrode is inserted with the second beveled edge as the end face, and the tail end of the full electrode is inserted with the first beveled edge as the end face. The full electrode is less likely to break through the isolation space between the cathode and anode in the radial direction of the wound cell, thereby further reducing the risk of the cathode and anode electrodes lapping and contacting each other at the feed end.

[0017] In some embodiments of this application, in the projection plane perpendicular to the second direction, the projection length H2 of the second hypotenuse satisfies: 7mm≤H2≤12mm.

[0018] In the above example, when the projected length of the second inclined side is within the aforementioned range, the insertion depth of the full tab at the feed end can be effectively reduced during the flattening process. By reasonably controlling this length, the full tab is less likely to break through the radial isolation space between the cathode and anode in the wound cell, reducing the risk of contact between the cathode and anode tabs, thereby significantly reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and extending its service life.

[0019] In some embodiments of this application, in the projection plane perpendicular to the first direction, the projection length of the second hypotenuse is W2, and satisfies: 1 / 10≤H2 / W2≤3.

[0020] In the above example, when the projected length of the second hypotenuse satisfies the aforementioned relationship, the structural morphology of the full tab can be optimized. During the flattening process, the insertion trajectory of the full tab can be better controlled, avoiding excessive insertion or positional deviation due to proportional imbalance. This effectively prevents the cathode and anode tabs from overlapping, thereby significantly reducing the risk of internal short circuits in the battery, stabilizing the battery's charge and discharge performance, reducing energy loss and capacity decay, greatly improving the reliability and safety of individual battery cells, and extending their service life.

[0021] In some embodiments of this application, the tilt angle a2 of the second hypotenuse satisfies: 2°≤a2<90°.

[0022] In the above example, when the inclination angle of the second inclined side satisfies the above relationship, the structural morphology of the full electrode tab can be optimized better, and the insertion direction and depth of the full electrode tab during the flattening operation can be effectively guided to prevent it from going too deep and breaking through the isolation space between the cathode and anode, thereby reducing the risk of the cathode electrode tab and anode electrode tab overlapping and contacting each other.

[0023] In some embodiments of this application, in the first direction, the full electrode includes a first part and a second part, the second part being connected between the first part and the electrode plate, in the second direction, the length of the second part being equal to the length of the electrode plate, the length of the first part being less than or equal to the length of the second part, and the first hypotenuse being located on the first part.

[0024] In the above example, by designing the first and second parts of the tabs, not only can the overall performance of the battery be effectively improved, but the risk of short circuit caused by bending and deformation of the end of the tabs causing the cathode tab and anode tab to overlap can also be effectively reduced. Thus, while improving the overall performance of the battery, the safety of the battery cells can be effectively guaranteed and the service life of the battery cells can be extended.

[0025] In some embodiments of this application, in the first direction, the size of the first part is L1, the size of the second part is L2, and the following conditions are met: 7mm≤L1≤12mm; 1mm≤L2≤3mm.

[0026] In the above example, by ensuring that the second part meets the above conditions, a stable and uniform electrical connection interface can be formed at the end face of the wound cell, effectively reducing contact resistance and improving current conduction efficiency. This reduces energy loss during charging and discharging, thereby improving the overall performance of the battery. By ensuring that the first part meets the above conditions, when constructing the first and second bevels on the first part, the first part has sufficient space to reduce the size of the end of the tab and the insertion end of the feed, thereby reducing the risk of short circuit between the cathode tab and the anode tab due to bending deformation at the end of the tab and the feed end. This effectively ensures the safety of the battery cell and extends its service life.

[0027] In some embodiments of this application, in the second direction, the length of the first portion is less than the length of the second portion, wherein the distance between the first end of the first portion and the first end of the second portion is L1, and the distance between the second end of the first portion and the second end of the second portion is L2, wherein L1 > 0 mm, L2 > 0 mm; or, L1 > 0 mm, L2 = 0 mm; or, L1 = 0 mm, L2 > 0 mm.

[0028] In the above example, by designing the dimensions of the first and second parts, the entire tab can have different structural forms, allowing the battery cell to optimize its structural layout according to actual needs, thereby improving the performance of the battery cell.

[0029] In some embodiments of this application, the distance between the first end of the first part and the first end of the second part is L1, and L1 > 0 mm; the second part has a third side located on one side of the second direction and a fourth side located on one side of the first direction at the first end, with a rounded transition between the third side and the fourth side; and / or, the distance between the second end of the first part and the second end of the second part is L2, and L2 > 0 mm; the second part has a fifth side located on one side of the second direction and a sixth side located on one side of the first direction at the second end, with a rounded transition between the fifth side and the sixth side.

[0030] In the above example, by making the sharp corner at one end of the second part rounded or both sharp corners rounded, the risk of damage to the wound cell caused by bending deformation at the end of the second part can be effectively reduced, thus preventing short circuit between the anode and cathode of the wound cell and effectively protecting the performance of the battery cell.

[0031] In some embodiments of this application, the full electrode lug is wound with multiple layers. In the radial direction, the outermost full electrode lug is the outer ring electrode lug. In the second direction, the size of the outer ring electrode lug is L, and satisfies: 1 / 5≤L1 / L≤1 / 2, and / or, 1 / 5≤L2 / L≤1 / 2.

[0032] In the above example, the appropriate L1 to L ratio and L2 to L ratio can prevent excessive insertion of the first part into the gap between the casing and the wound cell during winding and subsequent operations, reduce the risk of it breaking through the anode-cathode isolation space, reduce the risk of short circuit caused by tab insertion problems, ensure stable charging and discharging of the battery, extend the service life of the battery cell and improve safety.

[0033] In some embodiments of this application, the total electrode tab is provided with a reinforcing structure.

[0034] In the above example, by incorporating a reinforcing structure on the full tab, the rigidity and toughness of the full tab can be effectively enhanced, allowing it to better resist external forces under complex conditions such as winding and handling during battery cell production, as well as vibration and temperature changes during use. When bending occurs at the edge or end of the full tab during the flattening process, the tab shape at the end face of the wound cell remains relatively stable due to the reinforcing structure. This prevents excessive twisting and deformation that could lead to interference or short circuits between the tab and surrounding components, ensuring the integrity and safety of the battery's internal structure, maintaining the relative stability of the current conduction path, reducing local resistance changes caused by bending, thereby ensuring stable battery performance, extending battery life, and improving its reliability.

[0035] In some embodiments of this application, the reinforcing structure includes reinforcing ribs, and at least one reinforcing rib is provided.

[0036] In the above example, by constructing reinforcing ribs on the full tab, the structural strength of the full tab can be improved. When the full tab is flattened, the full tab located on the end face of the wound cell can maintain a good shape, thereby ensuring the stability of the internal structure of the battery, smooth current conduction, and improving the overall performance and service life of the battery. In addition, the reinforcing rib structure is simple, the production cost is low, and the shape can be arranged well, with good flexibility.

[0037] In some embodiments of this application, the reinforcing rib extends along the second direction, and when there are multiple reinforcing ribs, the multiple reinforcing ribs are spaced apart along the first direction.

[0038] In the above example, the reinforcing ribs extend along the second direction, which can better maintain a good structural shape when the full tab is wound. In addition, multiple reinforcing ribs arranged at intervals along the first direction can effectively improve the structural strength of the full tab, significantly improve the stability of the full tab, reduce problems such as poor contact and short circuit caused by tab deformation, thereby ensuring the safe and efficient operation of the battery and extending the battery's service life.

[0039] In some embodiments of this application, the reinforcing rib extends along the second direction and has at least one bent portion, the bent portion being a bent structure extending along an S-shaped bend.

[0040] In the example above, the S-shaped bending structure increases the extension length of the reinforcing ribs, allowing them to better distribute stress. When the tabs are subjected to external force, the bending part can buffer energy through its own deformation, effectively reducing stress concentration and minimizing the risk of tab bending. Simultaneously, this bending part can also adapt to the slight deformation of the tabs under different operating conditions to a certain extent, maintaining good contact between the tabs and other components, ensuring stable current transmission, and improving the reliability and durability of the battery.

[0041] In some embodiments of this application, the electrode is a positive electrode, and / or the electrode is a negative electrode.

[0042] In the above example, by designing the positive electrode tab or the negative electrode tab of the positive electrode sheet to have a first or second bevel, the risk of short circuit caused by bending deformation at the end of the tab can be effectively reduced, thus ensuring the safety of the battery cell and extending its service life.

[0043] In some embodiments of this application, the full-pole tab is adapted to be die-cut to form the first bevel at the tail end.

[0044] In the above example, the die-cutting method of full tabs is simple and convenient, and can be used to die-cut the first and second bevels of different sizes and tilt angles according to actual needs. It is flexible and low cost.

[0045] This application also proposes a battery device having the battery cells described in the above embodiments.

[0046] The battery device according to a second aspect of this application includes a housing and a battery cell, with at least one battery cell installed inside the housing. The battery cell includes a casing and an electrode assembly located inside the casing.

[0047] The battery device according to the embodiments of this application, by providing the battery cells of the above embodiments, can effectively ensure the safety performance of the battery cells and extend the service life of the battery cells, thus the battery device of this application can have high reliability and good safety.

[0048] This application also proposes an electrical device.

[0049] According to an embodiment of the third aspect of this application, the power-consuming device may include a battery cell for storing or providing electrical energy.

[0050] In the above examples, by setting up the battery cells and battery devices as described above, the power device of this application can have high reliability and good safety.

[0051] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0052] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0053] Figure 1 This is a structural schematic diagram of a vehicle according to one embodiment.

[0054] Figure 2 This is a schematic diagram of the electrode assembly according to the first embodiment.

[0055] Figure 3 This is a schematic diagram of the electrode assembly according to the first embodiment in its unwound state, showing the electrode sheet and the tab.

[0056] Figure 4 This is a schematic diagram of the structure of the electrode assembly according to the second embodiment.

[0057] Figure 5 This is a schematic diagram of the electrode assembly according to the second embodiment, showing the electrode sheet and the tab in their unwound state.

[0058] Figure 6 This is a schematic diagram of the electrode assembly according to the third embodiment.

[0059] Figure 7 This is a schematic diagram of the electrode assembly according to the third embodiment, showing the electrode sheet and the tab in their unwound state.

[0060] Figure label:

[0061] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor; X, First direction; Y, Second direction;

[0062] 10. Electrode assembly; 1. Electrode sheet; 11. Positive electrode sheet; 12. Negative electrode sheet; 13. Separator;

[0063] 2. Full-pole tab; 21. First side; 211. First hypotenuse;

[0064] 22. Second side; 221. Second hypotenuse;

[0065] 23. Reinforcing ribs;

[0066] 201. Part One; 202. Part Two;

[0067] 41. Third side; 42. Fourth side; 43. Fifth side; 44. Sixth side. Detailed Implementation

[0068] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0069] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0070] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0072] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0073] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0074] In related technologies, wound battery cells are manufactured by stacking positive electrode sheets, separators, and negative electrode sheets, then winding and hot-pressing them. The tabs at the ends of the wound battery cells need to be flattened. Flattening aims to make the ends of the wound battery cells flat, meeting the dimensional and structural stability requirements of subsequent PACK (battery pack assembly) processes. The cathode tab is a thin sheet that extends from the cathode current collector and is electrically connected to the internal active material, responsible for discharging electrons; the anode tab is similar. Under normal conditions, the two are insulated from each other, maintaining the independent operation of the internal electrochemical system of the battery.

[0075] A full tab is a design feature of battery tabs. In a battery structure, a tab is a portion of the battery electrode that extends to connect to an external circuit. Traditional tabs may only have a small portion of the electrode edge used for conduction, while a full tab uses the entire edge of the electrode as a tab. In manufacturing full tabs for wound battery cells, a certain width of blank area, or empty foil area, is typically reserved on both the positive and negative electrode sheets. These empty foil areas naturally form tabs after the cell is wound. For example, a positive electrode paste is first coated onto an aluminum foil surface to form a positive electrode sheet, and a negative electrode paste is coated onto a copper foil surface to form a negative electrode sheet. These are then slit to obtain electrode sheets with empty foil areas, which, after winding, become full tabs. After winding, positive and negative full-pole tabs will be formed at both ends of the wound cell, extending along the winding axis. The shape of the tabs is generally quite regular and they fit tightly against the end face of the cell, covering the entire end face or most of the end face, thereby increasing the effective area for current conduction.

[0076] For a wound cell with multiple tabs, under the mechanical force of flattening, the tabs on the outer ring, located at the edge of the wound cell, are inserted into the gap between the casing and the wound cell due to the inertia of the flattening action. As the flattening process progresses, the insertion depth increases, eventually breaking through the radial isolation space between the cathode and anode in the wound cell, causing the cathode tab and anode tab to overlap and contact.

[0077] Once the cathode and anode tabs are connected, an additional conductive path is formed inside the battery. From an electrochemical perspective, even if the battery is in a quiescent state without an external load, the anode has a low potential and is rich in electrons, while the cathode has a high potential. Driven by the potential difference, electrons will spontaneously flow from the anode to the cathode through the connection point. This causes the active materials of the positive and negative electrodes inside the battery to continuously undergo electrochemical reactions and consume electricity even without external power demand, thereby accelerating battery capacity decay and affecting battery safety and lifespan.

[0078] Based on the above considerations, in order to solve the problem of the tab breaking through the radial isolation space between the cathode and anode in the wound cell during the flattening action, a battery cell is designed. The battery cell includes a shell and an electrode assembly. The electrode assembly includes multiple stacked electrode sheets, which are adapted to be wound around the axis of the first direction to construct a wound cell. The electrode assembly also includes a full tab connected to the electrode sheets in the first direction. In the second direction, the full tab has an inlet end and a outlet end. The side of the outlet end in the second direction is the first side. In the direction from the electrode sheet to the full tab, at least a portion of the first side is inclined towards the inlet end, which is the first inclined side. The first direction and the second direction are perpendicular to each other. By setting a first bevel at the end, during the flattening process, the end of the full tab can be prevented from being inserted under the gap between the casing and the wound cell, or the insertion depth of the end of the full tab under the gap between the casing and the wound cell can be reduced. This reduces the risk of the full tab breaking through the radial isolation space between the cathode and anode in the wound cell, causing the cathode tab and anode tab to overlap and contact, thereby reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and helping to extend the service life of the battery cell.

[0079] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0080] This application provides an electrical device that uses a single battery cell as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0081] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0082] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Battery cells are disposed inside the vehicle 1000, and these battery cells can be located at the bottom, front, or rear of the vehicle 1000. The battery cells can be used to power the vehicle 1000; for example, the battery cells can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery cells to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0083] In some embodiments of this application, the battery cell can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0085] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0086] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0087] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0088] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0089] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0090] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0091] In some embodiments, the housing may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing may be at least a portion of the floor of the vehicle 1000, or a portion of the housing may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0092] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0093] For ease of explanation, the following embodiments use a single battery cell from an embodiment of this application as an example.

[0094] Reference Figure 2 , Figure 2 This is a schematic diagram of the electrode assembly according to the first embodiment.

[0095] Reference Figure 3 , Figure 3 This is a schematic diagram of the electrode assembly according to the first embodiment in its unwound state, showing the electrode sheet 1 and the tab 2.

[0096] In this example, the battery cell includes a housing and an electrode assembly 10. The electrode assembly 10 includes a plurality of stacked electrode sheets 1, which are adapted to be wound around the axis of the first direction X to form a wound cell. The electrode assembly 10 also includes a full tab 2 connected to the electrode sheet 1 in the first direction X. In the second direction Y, the full tab 2 has an inlet end and a outlet end. The side of the outlet end in the second direction Y is a first side 21. In the direction from the electrode sheet 1 to the full tab 2, at least a portion of the first side 21 is inclined towards the inlet end, which is a first inclined side 211. The first direction X and the second direction Y are perpendicular to each other.

[0097] Specifically, the wound cell is made by stacking positive electrode 11, separator 13 and negative electrode 12 and then winding and hot pressing them together. The tabs at the ends of the wound cell need to be flattened. Flattening is intended to make the ends of the wound cell flat, so as to meet the size and structural stability requirements of the subsequent PACK (battery pack assembly) process.

[0098] In the above example, in the winding direction, the full tab 2 has an inlet end and a outlet end. The inlet end refers to the end where the full tab 2 begins to be wound during cell winding. When manufacturing a wound cell, the positive electrode 11 and the negative electrode 12 begin winding from this position, and the tab portion corresponding to this starting position can be regarded as the inlet end tab. It is the first part to enter the winding structure during the entire winding process. The outlet end is the end where the electrode 1 finishes winding. When winding is near completion, the last part of the electrode 1 is wound in, forming the outlet end.

[0099] Combination Figure 3 In the example shown, electrode 1 is rectangular, while the tab 2 is trapezoidal. That is, both the inlet and outlet ends of the tab 2 are provided with bevels. The bevel at the inlet end is described in detail below and will not be repeated in this example. In this example, by providing a first bevel 211 at the outlet end, the angle between the first bevel 211 and the side of electrode 1 is obtuse. During the flattening operation, the insertion depth of the outlet end of the tab 2 along the gap between the casing and the wound cell can be reduced. This can reduce the risk of the tab 2 breaking through the radial isolation space between the cathode and anode in the wound cell, causing the cathode tab and anode tab to overlap and contact. This reduces the capacity decay of the battery cell, effectively ensures the safety performance of the battery cell, and helps to extend the service life of the battery cell.

[0100] In addition, by constructing a first inclined side 211, when the end of the full tab 2 is inserted along the gap between the casing and the wound cell, its sharp corner is removed. Here, the sharp corner refers to the fact that in the related technology, the full tab 2 is rectangular, and in the winding direction, the length of the full tab 2 is equal to the length of the electrode 1, and the corner of the end of the full tab 2 away from the electrode 1 is a right angle. This right angle is the aforementioned sharp corner. It can be understood that by constructing a first inclined side 211 in this application, when the end of the full tab 2 is inserted along the gap between the casing and the wound cell, it is inserted with the first inclined side 211 as the end face. Compared with the sharp corner, the area of ​​the first inclined side 211 is larger, making it less likely to break through the isolation space between the cathode and the anode in the radial direction of the wound cell, thereby effectively reducing the risk of contact between the cathode tab and the anode tab.

[0101] In addition, the tilt angle and size of the first inclined side 211 can be set so that the end of the full tab 2 will not be inserted through the gap between the housing and the wound cell, or the end of the full tab 2 will be inserted through the gap between the housing and the wound cell. However, according to the above-mentioned tilt angle and size design, the risk of the cathode tab and the anode tab overlapping and contacting each other is better reduced.

[0102] For example, the first side 21 may be partially constructed as the first hypotenuse 211 or may be entirely constructed as the first hypotenuse 211; this application does not impose any restrictions.

[0103] Therefore, in summary, in the above example, by setting the first bevel 211 at the end, during the flattening operation, the end of the full tab 2 can be prevented from being inserted along the gap between the casing and the wound cell, or the insertion depth of the end of the full tab 2 along the gap between the casing and the wound cell can be reduced. This can reduce the risk of the full tab 2 breaking through the radial isolation space between the cathode and anode in the wound cell, causing the cathode tab and anode tab to overlap and contact, thereby reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and helping to extend the service life of the battery cell.

[0104] In some embodiments of this application, reference is made to Figure 3 As shown, in the projection plane perpendicular to the second direction Y, the projection length H1 of the first hypotenuse 211 satisfies: 7mm≤H1≤12mm.

[0105] For example, the projected length H1 of the first hypotenuse 211 can be: 7mm, 8mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, or 12mm.

[0106] In the above example, when the projected length of the first inclined side 211 is within the aforementioned range, the insertion depth of the tail end of the full tab 2 along the gap between the casing and the wound cell can be effectively reduced during the flattening operation. By reasonably controlling this length, the full tab 2 is less likely to break through the radial isolation space between the cathode and anode in the wound cell, reducing the risk of contact between the cathode tab and anode tab, thereby significantly reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and extending its service life.

[0107] In some embodiments of this application, reference is made to Figure 3 As shown, in the projection plane perpendicular to the first direction X, the projection length of the first hypotenuse 211 is W1, and satisfies: 1 / 10≤H1 / W1≤3.

[0108] For example, H1 / W1 can be 0.2, 0.5, 0.8, 1.2, 1.5, 1.8, 2.2, 2.5, 2.8, or 3.

[0109] In the above example, when the projected length of the first hypotenuse 211 satisfies the aforementioned relationship, the structural morphology of the tab 2 can be optimized. During the flattening process, the insertion trajectory of the tab 2 along the gap between the casing and the wound cell can be better controlled, avoiding excessive insertion or positional deviation due to proportional imbalance. This effectively prevents the cathode tab and anode tab from overlapping, thereby effectively reducing the risk of internal short circuits in the battery, stabilizing the battery's charge and discharge performance, reducing energy loss and capacity decay, greatly improving the reliability and safety of the battery cell, and extending its service life.

[0110] In some embodiments of this application, reference is made to Figure 3 As shown, the inclination angle a1 of the first hypotenuse 211 satisfies: 2°≤a1<90°.

[0111] For example, the inclination angle a1 of the first hypotenuse 211 can be: 2°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, or 85°.

[0112] In the above example, when the tilt angle of the first inclined side 211 satisfies the above relationship, it can better optimize the structural shape of the full tab 2, and can effectively guide the insertion direction and depth of the full tab 2 along the gap between the shell and the wound cell during the flattening operation, preventing it from going too deep and breaking through the isolation space between the cathode and the anode, thereby better reducing the risk of the cathode tab and the anode tab overlapping and contacting.

[0113] In some embodiments of this application, the side of the feed end in the second direction Y is the second side 22, and in the direction from the electrode 1 to the tab 2, at least a portion of the second side 22 is inclined toward the end of the feed end as the second inclined side 221.

[0114] Combination Figure 2 and Figure 3 As shown, electrode 1 is rectangular, while the tab 2 is trapezoidal. That is, both the feed end and the take-off end of the tab 2 have beveled edges. The bevel at the feed end is the second bevel 221, and the bevel at the take-off end is the first bevel 211. The function and effect of the aforementioned bevel have already been explained, so they will not be repeated here. However, by placing the feed end, i.e., after the electrode 1 is wound into a wound cell, in the radial direction, the feed end is located at the center of the wound cell. In related technologies, the feed end is also prone to... The risk of bending during insertion is mitigated by the second inclined side 221, which reduces the insertion depth of the full tab 2 at the feed end. This reduces the risk of the full tab 2 making contact between the cathode and anode at the feed end. Furthermore, since the full tab 2 is inserted with the second inclined side 221 as the end face, it is less likely to break through the radial isolation space between the cathode and anode in the wound cell, further reducing the risk of the full tab 2 making contact between the cathode and anode at the feed end.

[0115] For example, the second side 22 can be partially constructed as the second hypotenuse 221, or it can be entirely constructed as the first hypotenuse 211; this application does not impose any limitations. (See reference...) Figure 3 The diagram shown is a structural schematic of electrode 1 in its unwound state. The second direction Y is the length direction of electrode 1, and the first direction X is the height direction of electrode 1.

[0116] In the above example, by constructing beveled edges at both the feed end and the termination end of the full tab 2, both the feed end and the termination end of the full tab 2 are shortened, thereby reducing the bending insertion depth of the full tab 2 at the feed end and the termination end. This reduces the risk of the cathode tab and anode tab lap contact at the feed end of the full tab 2. Furthermore, when the feed end of the full tab 2 is inserted, it is inserted with the second beveled edge 221 as the end face, and the termination end of the full tab 2 is inserted with the first beveled edge 211 as the end face. The full tab 2 is less likely to break through the isolation space between the cathode and anode in the radial direction of the wound cell, thereby further reducing the risk of the cathode tab and anode tab lap contact at the feed end of the full tab 2.

[0117] In some embodiments of this application, reference is made to Figure 3 As shown, in the projection plane perpendicular to the second direction Y, the projection length H2 of the second hypotenuse 221 satisfies: 7mm≤H2≤12mm.

[0118] For example, the projected length H2 of the second hypotenuse 221 can be: 7mm, 8mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, or 12mm.

[0119] In the above example, when the projected length of the second inclined side 221 is within the aforementioned range, the insertion depth of the feed end of the full tab 2 can be effectively reduced during the flattening operation. By reasonably controlling this length, the full tab 2 is less likely to break through the radial isolation space between the cathode and anode in the wound cell, reducing the risk of contact between the cathode tab and anode tab, thereby significantly reducing the capacity decay of the battery cell, effectively ensuring the safety performance of the battery cell, and extending its service life.

[0120] In some embodiments of this application, reference is made to Figure 3 As shown, in the projection plane perpendicular to the first direction X, the projection length of the second hypotenuse 221 is W2, and satisfies: 1 / 10≤H2 / W2≤3.

[0121] For example, H2 / W2 can be 0.2, 0.5, 0.8, 1.2, 1.5, 1.8, 2.2, 2.5, 2.8, or 3.

[0122] In the above example, when the projected length of the second hypotenuse 221 satisfies the aforementioned relationship, the structural morphology of the full tab 2 can be optimized better. During the flattening process, the insertion trajectory of the full tab 2 can be better controlled, avoiding excessive insertion or positional deviation due to proportional imbalance. This effectively prevents the cathode tab and anode tab from overlapping, thereby effectively reducing the risk of internal short circuits in the battery, stabilizing the battery's charge and discharge performance, reducing energy loss and capacity decay, and greatly improving the reliability and safety of the battery cell, extending its service life.

[0123] In some embodiments of this application, reference is made to Figure 3 As shown, the inclination angle a2 of the second hypotenuse 221 satisfies: 2°≤a2<90°.

[0124] For example, the inclination angle a1 of the second hypotenuse 221 can be: 2°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, or 85°.

[0125] In the above example, when the tilt angle of the second inclined side 221 satisfies the above relationship, it can better optimize the structural shape of the full electrode tab 2 and effectively guide the insertion direction and depth of the full electrode tab 2 during the flattening operation, preventing it from going too deep and breaking through the isolation space between the cathode and anode, thereby better reducing the risk of the cathode electrode tab and the anode electrode tab overlapping and contacting each other.

[0126] Please refer to Figures 4-6 , Figure 4 This is a schematic diagram of the structure of the electrode assembly according to the second embodiment. Figure 5 This is a schematic diagram of the electrode assembly according to the second embodiment, showing the electrode sheet and the tab in their unwound state. Figure 6 This is a schematic diagram of the electrode assembly according to the third embodiment. Figure 7 This is a schematic diagram of the electrode assembly according to the third embodiment, showing the electrode sheet and the tab in their unwound state.

[0127] In some embodiments of this application, in the first direction X, the full electrode 2 includes a first part 201 and a second part 202, the second part 202 being connected between the first part 201 and the electrode 1, and in the second direction Y, the length of the second part 202 being equal to the length of the electrode 1, the length of the first part 201 being less than or equal to the length of the second part 202, and the first inclined side 211 being located on the first part 201.

[0128] For example, the second part 202 is flattened on the axial end face of the wound cell when it is flattened. Its design of being the same length as the electrode 1 can ensure that a stable and uniform electrical connection interface is formed at the end face, effectively reducing contact resistance and improving current conduction efficiency, thereby reducing energy loss during the charging and discharging process of the battery and thus improving the overall performance of the battery.

[0129] For example, refer to Figure 6 The first portion 201 is shorter than the second portion 202 and has a first bevel 211. Alternatively, the first portion 201 may have a length equal to the second portion 202 and also have a first bevel 211. In the above example, during the flattening process, the first bevel 211 effectively reduces the risk of the first portion 201's tab 2 being inserted along the gap between the casing and the wound cell, preventing it from going too deep and causing a short circuit between the cathode and anode tabs, thus ensuring battery safety.

[0130] For example, the second part 202 is a strip-shaped structure extending along the second direction Y, and has a uniform width in the first direction X.

[0131] For example, the first portion 201 having the first hypotenuse 211 and the second hypotenuse 221 can be an isosceles trapezoid or not, and this application does not limit it.

[0132] In the above example, by designing the first part 201 and the second part 202 of the tab, not only can the overall performance of the battery be effectively improved, but the risk of short circuit caused by bending and deformation of the end of the tab 2 causing the cathode tab and anode tab to overlap can also be effectively reduced. Thus, while improving the overall performance of the battery, the safety of the battery cell can be effectively guaranteed and the service life of the battery cell can be extended.

[0133] In some embodiments of this application, reference is made to Figure 6 In the first direction X, the size of the first part 201 is L1, and the size of the second part 202 is L2, and the following conditions are met: 7mm≤L1≤12mm; 1mm≤L2≤3mm.

[0134] Exemplarily, L1=7mm, L2=1mm; L1=8mm, L2=1.5mm; L1=9mm, L2=2mm; L1=9.5mm, L2=1.2mm; L1=10mm, L2=2.5mm; L 1=10.5mm, L2=1.8mm; L1=11mm, L2=3mm; L1=11.5mm, L2=1mm; L1=12mm, L2=2.2mm; L1=7.5mm, L2=2.8mm.

[0135] In the above example, by ensuring that the second part 202 meets the above conditions, a stable and uniform electrical connection interface can be formed at the end face of the wound cell, effectively reducing contact resistance and improving current conduction efficiency. This reduces energy loss during charging and discharging, thereby improving the overall performance of the battery. By ensuring that the first part 201 meets the above conditions, when the first inclined side 211 and the second inclined side 221 are constructed on the first part 201, the first part 201 can have sufficient space, allowing the first inclined side 211 and the second inclined side 221 to better reduce the size of the end and feed end of the full tab 2. This reduces the risk of short circuit between the cathode tab and the anode tab due to bending deformation of the end and feed end of the full tab 2, thereby effectively ensuring the safety of the battery cell and extending its service life.

[0136] In some embodiments of this application, reference is made to Figure 6In the second direction Y, the length of the first part 201 is less than the length of the second part 202, wherein the distance between the first end of the first part 201 and the first end of the second part 202 is L1, and the distance between the second end of the first part 201 and the second end of the second part 202 is L2, wherein L1 > 0 mm, L2 > 0 mm; or, L1 > 0 mm, L2 = 0 mm; or, L1 = 0 mm, L2 > 0 mm.

[0137] For example, combined Figure 6 In the example shown, L1 > 0 mm and L2 > 0 mm. Therefore, most or all of the second part 202 can be attached to the end face of the wound cell. Since L1 > 0 mm and L2 > 0 mm, the size of the first part 201 is directly shortened in the second direction Y. This reduces the insertion dimensions at both ends of the first part 201 during the flattening process, thereby reducing the risk of short circuits caused by bending deformation at the end of the tab 2 and the feed end, which could lead to contact between the cathode and anode tabs. This effectively ensures the safety of the battery cell and extends its service life. Furthermore, the first part 201 satisfying the above conditions can be an isosceles trapezoid or not; this application does not impose any restrictions.

[0138] For example, L1 > 0 mm, L2 = 0 mm; or, L1 = 0 mm, L2 > 0 mm. That is, the first part 201 that satisfies the above conditions is a right trapezoid. For ease of explanation, the first end is the tail end of the full electrode 2, and the second end is the feed end of the full electrode 2. When L1 > 0 mm and L2 = 0 mm, the bending deformation at the tail end of the first part 201 is smaller than the bending deformation at the feed end; when L1 = 0 mm and L2 > 0 mm, the bending deformation at the feed end of the first part 201 is smaller than the bending deformation at the tail end.

[0139] In the above example, by designing the dimensions of the first part 201 and the second part 202, the full tab 2 can have different structural forms, allowing the battery cell to optimize its structural layout according to actual needs, thereby improving the performance of the battery cell.

[0140] In some embodiments of this application, reference is made to Figure 6The distance between the first end of the first part 201 and the first end of the second part 202 is L1, and L1 > 0 mm. The second part 202 has a third side 41 located on the Y side of the second direction and a fourth side 42 located on the X side of the first direction at the first end. The third side 41 and the fourth side 42 are connected by an arc. Or, the distance between the second end of the first part 201 and the second end of the second part 202 is L2, and L2 > 0 mm. The second part 202 has a fifth side 43 located on the Y side of the second direction and a sixth side 44 located on the X side of the first direction at the second end. The fifth side 43 and the sixth side 44 are connected by an arc.

[0141] For example, the distance between the first end of the first part 201 and the first end of the second part 202 is L1, and L1 > 0 mm. The second part 202 has a third side 41 located on the Y side of the second direction and a fourth side 42 located on the X side of the first direction at its first end, with a rounded transition between the third side 41 and the fourth side 42. By making the rounded transition between the third side 41 and the fourth side 42, sharp corners can be avoided between the third side 41 and the fourth side 42 of the second part 202. Thus, during the flattening operation, even if the second part 202 is bent and deformed during flattening, its inserted end is rounded, which is less likely to damage the wound battery cell.

[0142] For example, the distance between the second end of the first part 201 and the second end of the second part 202 is L2, and L2 > 0 mm. The second part 202 has a fifth side 43 located on the Y side of the second direction and a sixth side 44 located on the X side of the first direction at its second end, with a rounded transition between the fifth side 43 and the sixth side 44. By making the rounded transition between the fifth side 43 and the sixth side 44, sharp corners can be avoided between the fifth side 43 and the sixth side 44 of the second part 202. Thus, during the flattening process, even if the second part 202 is bent and deformed during flattening, its inserted end is rounded, which is less likely to damage the wound battery cell.

[0143] For example, the distance between the first end of the first part 201 and the first end of the second part 202 is L1, and L1 > 0 mm. The second part 202 has a third side 41 located on the Y side of the second direction and a fourth side 42 located on the X side of the first direction at the first end, with a rounded transition between the third side 41 and the fourth side 42. Or, the distance between the second end of the first part 201 and the second end of the second part 202 is L2, and L2 > 0 mm. The second part 202 has a fifth side 43 located on the Y side of the second direction and a sixth side 44 located on the X side of the first direction at the second end, with a rounded transition between the fifth side 43 and the sixth side 44.

[0144] In the above example, by making the sharp corner at one end of the second part 202 a rounded corner or both sharp corners a rounded corner, the risk of damage to the wound cell caused by bending deformation at the end of the second part 202 can be effectively reduced, thus reducing the risk of short circuit between the anode and cathode of the wound cell. This effectively protects the performance of the battery cell.

[0145] In some embodiments of this application, the full electrode 2 is wound with multiple layers. In the radial direction, the outermost full electrode 2 is the outer ring electrode. In the second direction Y, the size of the outer ring electrode is L, and satisfies: 1 / 5≤L1 / L≤1 / 2, and / or, 1 / 5≤L2 / L≤1 / 2.

[0146] For example, L1 / L can be: 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.45, for example: L = 10mm, L1 = 2mm; L = 15mm, L1 = 3mm; L = 20mm, L1 = 4mm; L = 25mm, L1 = 5mm; L = 30mm, L1 = 6mm; L = 35mm, L1 = 7mm; L = 40mm, L1 = 8mm; L = 45mm, L1 = 9mm; L = 50mm, L1 = 10mm; L = 55mm, L1 = 11mm.

[0147] For example, L2 / L can be: 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.45, for example: L = 5mm, L2 = 1mm; L = 10mm, L2 = 2mm; L = 15mm, L2 = 3mm; L = 20mm, L2 = 4mm; L = 25mm, L2 = 5mm; L = 30mm, L2 = 6mm; L = 35mm, L2 = 7mm; L = 40mm, L2 = 8mm; L = 45mm, L2 = 9mm; L = 50mm, L2 = 10mm.

[0148] In the above example, the appropriate ratio of L1 to L and L2 to L can prevent excessive insertion of the first part 201 into the gap between the casing and the wound cell during winding and subsequent operations due to excessive length. This reduces the risk of it breaking through the anode-cathode isolation space, reduces the risk of short circuits caused by tab insertion problems, ensures stable charging and discharging of the battery, extends the service life of the battery cell, and improves safety.

[0149] In some embodiments of this application, the omnipolar tab 2 is provided with a reinforcing structure.

[0150] For example, the common reinforcement structures of the full tab 2 are diverse. The metal skeleton reinforcement type embeds a metal skeleton woven into a mesh by nickel wire, copper wire, etc. inside or on its surface, which provides strong support like steel bars in a building and disperses the stress caused by external forces to prevent bending. The composite material reinforcement type combines high-strength and high-toughness fiber materials such as carbon fiber and glass fiber with the tab material, and enhances the bending resistance by taking advantage of the fiber properties. There is also the thickened coating reinforcement type, which coats a thicker special polymer coating on the surface of the tab to improve the overall structural strength and toughness and reduce the risk of bending.

[0151] In the above example, by setting a reinforcing structure on the full tab 2, the rigidity and toughness of the full tab 2 can be effectively enhanced, making it better resistant to external forces under complex working conditions such as winding and handling during battery cell production and vibration and temperature changes during use. When bending occurs at the edge or end of the full tab 2 during the flattening process, the tab shape at the end face of the wound cell can still remain relatively stable due to the presence of the reinforcing structure. It will not cause excessive twisting and deformation that would lead to interference or short circuit between the tab and surrounding components, ensuring the integrity and safety of the battery's internal structure, maintaining the relative stability of the current conduction path, reducing local resistance changes caused by bending, thereby ensuring stable battery performance output, extending battery life and improving its reliability.

[0152] In some embodiments of this application, reference is made to Figures 4-6 The reinforcing structure includes a reinforcing rib 23, and at least one reinforcing rib 23 is provided.

[0153] For example, there is one reinforcing rib 23; for example, there are two or more reinforcing ribs 23.

[0154] For example, the reinforcing rib 23 may be arranged along the length direction, width direction or other specific angle of the full-pole tab 2, and this application does not impose any restrictions.

[0155] For example, the reinforcing rib 23 can be directly constructed by stamping or other means, or it can be fixedly connected to the tab 2 by welding or other means. This application does not limit this.

[0156] In the above example, by constructing reinforcing ribs 23 on the full tab 2, the structural strength of the full tab 2 can be improved. When the full tab 2 is flattened, the full tab 2 located on the end face of the wound cell can maintain a good shape, thereby ensuring the stability of the internal structure of the battery, smooth current conduction, and improving the overall performance and service life of the battery. In addition, the reinforcing ribs 23 have a simple structure, low production cost, and their shape can be arranged well, with good flexibility.

[0157] In some embodiments of this application, reference is made to Figures 4-6The reinforcing rib 23 extends along the second direction Y. When there are multiple reinforcing ribs 23, the multiple reinforcing ribs 23 are spaced apart along the first direction X.

[0158] In the above example, the reinforcing rib 23 extends along the second direction Y, which can maintain a good structural shape when the full tab 2 is wound. Furthermore, the multiple reinforcing ribs 23 arranged at intervals along the first direction X can effectively improve the structural strength of the full tab 2, significantly enhance the stability of the full tab 2, and reduce problems such as poor contact and short circuit caused by tab deformation, thereby ensuring the safe and efficient operation of the battery and extending the battery's service life.

[0159] In some embodiments of this application, reference is made to Figures 4-6 The reinforcing rib 23 extends along the second direction Y and has at least one bent portion, which is a bent structure extending along an S-shaped bend.

[0160] In the example above, the S-shaped bending structure increases the extension length of the reinforcing rib 23, enabling it to better disperse stress. When the tab 2 is subjected to external force, the bending part can buffer energy through its own deformation, effectively reducing stress concentration and minimizing the risk of tab bending. At the same time, this bending part can also adapt to the slight deformation of the tab under different operating conditions to a certain extent, maintaining good contact between the tab and other components, ensuring stable current transmission, and improving the reliability and durability of the battery.

[0161] In some embodiments of this application, reference is made to Figure 2 , Figure 3 and Figure 5 Electrode 1 is a positive electrode 11, and / or, electrode 1 is a negative electrode 12.

[0162] For example, one end of the positive electrode 11 in the first direction X is connected to a positive electrode tab, and the end of the positive electrode tab is provided with a first inclined side 211, or the end of the positive electrode tab and the feed end are respectively provided with a first inclined side 211 and a second inclined side 221.

[0163] For example, one end of the negative electrode sheet 12 in the first direction X is connected to a negative electrode tab, and the end of the negative electrode tab is provided with a first inclined side 211, or the end of the negative electrode tab and the feed end are respectively provided with a first inclined side 211 and a second inclined side 221.

[0164] In the above example, by designing the positive electrode tab of the positive electrode 11 or the negative electrode tab of the negative electrode 12 to have a first inclined side 211 or a second inclined side 221, the risk of short circuit between the cathode tab and the anode tab due to bending deformation at the end of the tab 2 can be effectively reduced, thus effectively ensuring the safety of the battery cell and extending the service life of the battery cell.

[0165] In some embodiments of this application, the full tab 2 is adapted to be die-cut to form a first bevel 211 at the tail end.

[0166] For example, the feed end of the full tab 2 can also be constructed with a second bevel 221 by die cutting.

[0167] For example, when manufacturing the tab 2 of the wound cell, a certain width of blank area, i.e. empty foil area, is usually reserved on the positive electrode 11 and the negative electrode 12. These empty foil areas will naturally form tabs after the cell is wound. The empty foil areas can be die-cut to construct the first bevel 211 or bevel.

[0168] In the above example, the die-cutting method of the full tab 2 is simple and convenient, and can be used to die-cut the first inclined side 211 and the second inclined side 221 with different sizes and different tilt angles according to actual needs. It is flexible and low cost.

[0169] It is understandable that the full electrode 2 can also have the first bevel 211 or the second bevel 221 during the manufacturing process, that is, the full electrode 2 does not need further processing such as die cutting. Therefore, this application does not impose any restrictions on this.

[0170] This application also proposes a battery device 100 having the battery cells described in the above embodiments.

[0171] According to an embodiment of this application, the battery device 100 includes a housing and a battery cell, with at least one battery cell installed inside the housing. The battery cell includes a casing and an electrode assembly 10 located inside the casing.

[0172] The battery device 100 according to the embodiments of this application, by providing the battery cells of the above embodiments, can effectively ensure the safety performance of the battery cells and extend the service life of the battery cells, thus the battery device 100 of this application can have high reliability and good safety.

[0173] The aforementioned battery device 100 can be applied to, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among these, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., while spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0174] Since the battery device 100 of this application adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0175] This application also proposes an electrical device.

[0176] According to embodiments of this application, the electrical device may include a battery cell, which is used to store or provide electrical energy.

[0177] In the above examples, by setting up the battery cell and battery device 100 as described above, the power device of this application can have high reliability and good safety.

[0178] The battery cell, battery device 100, other components and operation of the power supply device according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0179] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0180] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized by, include: case; An electrode assembly (10) includes a plurality of stacked electrode sheets (1) adapted to be wound around an axis in a first direction (X) to form a wound cell. The electrode assembly (10) also includes a full tab (2) connected to the electrode sheet (1) in the first direction (X). In a second direction (Y), the full tab (2) has an inlet end and a outlet end. The outlet end is a first side (21) on its side in the second direction (Y). In the direction from the electrode sheet (1) to the full tab (2), at least a portion of the first side (21) is inclined toward the inlet end as a first inclined side (211). The first direction (X) and the second direction (Y) are perpendicular to each other.

2. The battery cell according to claim 1, characterized in that, In the projection plane perpendicular to the second direction (Y), the projection length H1 of the first hypotenuse (211) satisfies: 7mm≤H1≤12mm.

3. The battery cell according to claim 2, characterized in that, In the projection plane perpendicular to the first direction (X), the projection length of the first hypotenuse (211) is W1, and satisfies: 1 / 10≤H1 / W1≤3.

4. The battery cell according to any one of claims 1-3, characterized in that, The inclination angle a1 of the first hypotenuse (211) satisfies: 2°≤a1<90°.

5. The battery cell according to any one of claims 1-4, characterized in that, The side of the feed end in the second direction (Y) is the second side (22), and in the direction from the electrode (1) to the tab (2), at least a portion of the second side (22) is inclined toward the tail end as the second inclined side (221).

6. The battery cell according to claim 5, characterized in that, In the projection plane perpendicular to the second direction (Y), the projection length H2 of the second hypotenuse (221) satisfies: 7mm≤H2≤12mm.

7. The battery cell according to claim 6, characterized in that, In the projection plane perpendicular to the first direction (X), the projection length of the second hypotenuse (221) is W2, and satisfies: 1 / 10≤H2 / W2≤3.

8. The battery cell according to any one of claims 5-7, characterized in that, The inclination angle a2 of the second hypotenuse (221) satisfies: 2°≤a2<90°.

9. The battery cell according to any one of claims 1-8, characterized in that, In the first direction (X), the full electrode (2) includes a first part (201) and a second part (202), the second part (202) being connected between the first part (201) and the electrode (1). In the second direction (Y), the length of the second part (202) is equal to the length of the electrode (1), the length of the first part (201) is less than or equal to the length of the second part (202), and the first hypotenuse (211) is located on the first part (201).

10. The battery cell according to claim 9, characterized in that, In the first direction (X), the size of the first part (201) is L1, and the size of the second part (202) is L2, and the following conditions are met: 7mm≤L1≤12mm; 1mm≤L2≤3mm.

11. The battery cell according to claim 9, characterized in that, In the second direction (Y), the length of the first part (201) is less than the length of the second part (202), wherein the distance between the first end of the first part (201) and the first end of the second part (202) is L1, and the distance between the second end of the first part (201) and the second end of the second part (202) is L2, wherein L1 > 0 mm, L2 > 0 mm; or, L1 > 0 mm, L2 = 0 mm; or, L1 = 0 mm, L2 > 0 mm.

12. The battery cell according to claim 9, characterized in that, The distance between the first end of the first part (201) and the first end of the second part (202) is L1, and L1 > 0 mm. The second part (202) has a third side (41) located on the second direction (Y) side and a fourth side (42) located on the first direction (X) side at its first end. The third side (41) and the fourth side (42) are connected by an arc transition, and / or, The distance between the second end of the first part (201) and the second end of the second part (202) is L2, and L2 > 0 mm. The second part (202) has a fifth side (43) located on the second direction (Y) side and a sixth side (44) located on the first direction (X) side at the second end, and the fifth side (43) and the sixth side (44) are connected by an arc transition.

13. The battery cell according to claim 11 or 12, characterized in that, The full electrode (2) is wound with multiple layers. In the radial direction, the outermost full electrode (2) is the outer ring electrode. In the second direction (Y), the size of the outer ring electrode is L, and satisfies: 1 / 5≤L1 / L≤1 / 2, and / or, 1 / 5≤L2 / L≤1 / 2.

14. The battery cell according to any one of claims 1-13, characterized in that, The total electrode (2) is provided with a reinforcing structure.

15. The battery cell according to claim 14, characterized in that, The reinforcing structure includes a reinforcing rib (23), and at least one reinforcing rib (23) is provided.

16. The battery cell according to claim 15, characterized in that, The reinforcing rib (23) extends along the second direction (Y), and when there are multiple reinforcing ribs (23), the multiple reinforcing ribs (23) are spaced apart along the first direction (X).

17. The battery cell according to claim 15, characterized in that, The reinforcing rib (23) extends along the second direction (Y) and has at least one bent portion, which is a bent structure extending along an S-shaped bend.

18. The battery cell according to any one of claims 1-17, characterized in that, The electrode (1) is a positive electrode (11), and / or the electrode (1) is a negative electrode (12).

19. The battery cell according to any one of claims 1-18, characterized in that, The full-pole tab (2) is adapted for die-cutting to form the first bevel (211) at the tail end.

20. A battery device (100), characterized in that, Includes the battery cell according to any one of claims 1-19.

21. An electrical appliance, characterized in that, Includes the battery device (100) of claim 20, the battery device (100) being used to store or provide electrical energy.

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