Battery cell, battery device and electric device

Abstract

The invention discloses a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell and a battery cell, the battery cell is installed in the shell, the battery cell comprises a plurality of pole pieces and a diaphragm, and the plurality of pole pieces are stacked along a first direction; the diaphragm is arranged between two adjacent pole pieces, the extension length of the diaphragm along the circumferential direction is greater than the extension length of the pole pieces along the circumferential direction, and the diaphragm is folded at the periphery of the pole pieces to form a buffer layer. According to the battery monomer, the extension length of the diaphragm in the circumferential direction is greater than that of the pole piece in the circumferential direction, and the diaphragm is folded on the periphery of the pole piece to form the buffer layer, so that the problem that the edge of the pole piece is poorer to be protected by the existing diaphragm can be effectively solved, and a powerful guarantee is provided for improving the performance and the safety of the battery.

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] In the structure of a battery cell, the separator plays a crucial role. Current separator overhang regions do indeed offer good short-circuit protection. The design of the overhang region can, to a certain extent, prevent direct contact between the positive and negative electrodes, thereby reducing the risk of short circuits. During charging and discharging, the battery may experience internal pressure or displacement due to various reasons, and the overhang region provides an additional barrier to ensure isolation between the electrodes.

[0003] However, it cannot be ignored that current separators provide poor protection for the electrode edges. The electrode edges are a relatively fragile area, easily affected by external forces such as impacts and compression. In practical use, electrode edges may experience wear and breakage, leading to decreased battery performance or even safety incidents. Furthermore, the active materials at the electrode edges may react with the separator, affecting the battery's cycle life and safety. 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 objective of this application is to provide a battery cell that effectively solves the problem of poor edge protection of existing separators, thus providing a strong guarantee for improving battery performance and safety.

[0005] According to an embodiment of this application, a battery cell includes a housing and a battery cell. The battery cell is installed inside the housing. The battery cell includes an electrode and a separator. A plurality of the electrode plates are stacked along a first direction. The separator is disposed between two adjacent electrode plates. The circumferential extension length of the separator is greater than the circumferential extension length of the electrode plate, and the separator is wrinkled around the outer periphery of the electrode plate to form a buffer layer.

[0006] In the above example, by extending the circumferential length of the separator to be greater than that of the electrode in the circumferential direction, and by making the separator wrinkle on the outer periphery of the electrode to form a buffer layer, the problem of poor protection of the electrode edge by existing separators can be effectively solved, providing a strong guarantee for improving battery performance and safety.

[0007] In one embodiment of this application, the extension length of the diaphragm on one side of the electrode in the second direction is greater than or equal to the extension length of the diaphragm on the other side of the electrode in the second direction.

[0008] In the above example, the diaphragm on the longer side can extend in a specific direction (e.g., Figure 3It provides stronger protection on the bottom of the electrode (in the middle) and reduces the possibility of problems between the electrode and the separator caused by external factors or internal stress.

[0009] In the example above, this symmetrical design ensures that the electrode is protected in a more balanced manner in all directions.

[0010] In one embodiment of this application, the extension length of the diaphragm on one side of the electrode is L2, and the extension length of the diaphragm on the other side of the electrode is L1, satisfying: ΔL=L2-L1, where 0mm≤ΔL≤10mm.

[0011] In the example above, a reasonable ΔL range ensures that the diaphragm has sufficient extension on both sides of the electrode, providing good protection for the electrode.

[0012] In one embodiment of this application, the extension length L1 of the diaphragm on the other side of the electrode satisfies: 1mm≤L1≤20mm.

[0013] In the example above, the reasonable length range ensures that the diaphragm has sufficient extension on both sides of the electrode, providing effective protection for the electrode.

[0014] In one embodiment of this application, the extension length L2 of the diaphragm on one side of the electrode satisfies: 1mm≤L2≤20mm.

[0015] In the example above, the reasonable length range ensures that the diaphragm has sufficient extension on both sides of the electrode, providing effective protection for the electrode.

[0016] In one embodiment of this application, the extension length of the diaphragm on one side of the electrode is equal to the extension length of the diaphragm on the other side of the electrode.

[0017] In the example above, this symmetrical design ensures that the electrode is protected in a more balanced manner in all directions.

[0018] In one embodiment of this application, the battery cell is a stacked battery cell, and the buffer layer is located on at least one side of the electrode in the length direction, and / or the buffer layer is located on at least one side of the electrode in the width direction.

[0019] In the above example, from a structural stability perspective, the buffer layer, positioned along the length and / or width of the electrode, provides comprehensive protection for the electrode. Whether during battery assembly or subsequent use and transportation, it effectively reduces the risk of damage to the electrode due to external impacts. For example, when the battery is accidentally bumped or squeezed, the buffer layer can absorb and disperse the external force, preventing the electrode from deforming or cracking, thereby maintaining the overall structural integrity of the battery.

[0020] In one embodiment of this application, the battery cell is a wound battery cell, and the buffer layer is located at the bottom of the battery cell or at both the bottom and top of the battery cell.

[0021] In the above example, by setting a buffer layer at the bottom of the wound cell or at both the bottom and top of the cell, the impact force from the outside can be effectively absorbed and dispersed, thus better protecting the electrode from damage.

[0022] In one embodiment of this application, the diaphragm includes a plurality of diaphragm segments spaced apart along a first direction, wherein two adjacent diaphragm segments are adapted to be stacked on top of each other in a second direction so that the plurality of diaphragm segments are fixedly connected to each other to form the buffer layer.

[0023] In the above example, different separator segments can be flexibly adjusted according to the specific shape and stress of the electrode to better adapt to the complex environment inside the battery.

[0024] In one embodiment of this application, the plurality of diaphragm segments are heat-fused or adhesively bonded together.

[0025] In the examples above, both hot-melt bonding and adhesive bonding can effectively ensure that the buffer layer maintains a stable structure during battery use, and can effectively protect the electrode even when subjected to external impact, vibration or temperature changes.

[0026] In one embodiment of this application, the buffer layer of the diaphragm on one side of the electrode in the second direction is a first buffer layer, and the buffer layer of the diaphragm on the other side of the electrode in the second direction is a second buffer layer. A plurality of diaphragm segments of the first buffer layer are fixedly connected, and / or a plurality of diaphragm segments of the second buffer layer are fixedly connected.

[0027] In the above example, the buffer layer can be effectively ensured to maintain a stable structure during battery use, and can effectively protect the electrode even when subjected to external impact, vibration or temperature changes.

[0028] In one embodiment of this application, the electrode includes a positive electrode, which includes a positive current collector and a positive active material layer disposed on at least one side of the positive current collector. The positive current collector includes a polymer matrix and conductive layers disposed on both sides of the polymer matrix. The polymer matrix has through holes, and the conductive layers at least partially fill the interior of the through holes.

[0029] In the above example, the polymer matrix has through-holes, and the conductive layer at least partially fills the interior of the through-holes, improving electron transport efficiency. The porous structure facilitates electrolyte permeation and rapid ion diffusion, thereby enhancing the battery's charge and discharge performance.

[0030] In one embodiment of this application, the positive electrode active material in the positive electrode active material layer includes a compound with the following molecular formula: Li a Ni x Co y Mn z M b O2, wherein 0.60≤a≤1.20, 0.80≤x≤0.98, y>0, z>0, 0.001≤b≤0.02, and M includes at least one of Al, Zr, Mg, Zn, Y, Fe, Nb, W, Zn, Mo, Ba, Ca, Ta and Ti.

[0031] In the example above, Li a Ni x Co y Mn z M b The specific component ratios in O2 ensure high capacity and stability, while added trace elements improve performance. Conductive agents enhance conductivity, binders firmly bond active materials, and dispersants ensure uniform dispersion of components. These combined effects improve battery energy density, charge / discharge performance, and cycle life.

[0032] In one embodiment of this application, the positive electrode active material layer further includes a conductive agent, which includes at least one of conductive carbon black, graphene, or carbon nanotubes.

[0033] In one embodiment of this application, the conductive agent accounts for 0.2% to 0.5% of the total mass.

[0034] In the above example, the mass percentage of the conductive agent that meets the above conditions can effectively improve electrode conductivity, ensure rapid electron transport, and facilitate battery charging and discharging. If the mass percentage of the conductive agent is too low, the conductivity will be insufficient; if the mass percentage is too high, it may affect the proportion of active material and reduce battery capacity. This proportion balances conductivity with other performance characteristics.

[0035] In one embodiment of this application, the compaction density of the positive electrode active material layer is 3.45 g / cm³. 3 Up to 3.8 g / cm 3 .

[0036] In the examples above, a higher compaction density means that more active material can be accommodated in the same volume, thereby increasing the battery's energy density. This allows the battery to provide longer-lasting power to electronic devices. At the same time, a suitable compaction density helps maintain the stability of the electrode structure, reducing structural damage caused by the expansion and contraction of active material during charging and discharging, and extending the battery's cycle life. Furthermore, it optimizes the utilization of the battery's internal space, making the battery design more compact and efficient.

[0037] In one embodiment of this application, the energy density of the battery cell is between 750Wh / L and 950Wh / L.

[0038] This application also proposes a battery device having the battery cells described in the above embodiments.

[0039] In one embodiment of this application, the battery device includes a housing and a battery cell, with at least one battery cell installed inside the housing.

[0040] In the above example, the buffer layer provides additional protection for the individual battery cells. When the battery device is subjected to external impacts or vibrations, it can effectively absorb and disperse energy, reducing the risk of damage to the individual battery cells and thus improving the structural stability of the entire battery device. On the other hand, the buffer layer helps maintain the good condition of the electrodes inside the battery cells. During the use of the battery device, the buffer layer can adapt to the expansion and contraction of the electrodes, reducing performance degradation caused by electrode deformation and extending the lifespan of the individual battery cells and the entire battery device. Simultaneously, the presence of the buffer layer also enhances the safety of the battery device, reducing the probability of safety accidents such as short circuits, enabling the battery device to operate more reliably in various application scenarios and providing users with a stable power supply.

[0041] The aforementioned battery devices can be applied to, but are 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.

[0042] Since the battery device 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 repeated here.

[0043] This application also proposes an electrical device having the battery device described in the above embodiments.

[0044] According to embodiments of this application, the electrical device may include a battery device for storing or providing electrical energy.

[0045] In the above examples, by providing the battery device described above, the power supply device of this application can have higher performance and a longer service life.

[0046] 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

[0047] 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:

[0048] Figure 1 This is a structural schematic diagram of a vehicle according to one embodiment.

[0049] Figure 2 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0050] Figure 3 This is a cross-sectional view of a battery cell provided in the first embodiment of this application.

[0051] Figure label:

[0052] 1000, Vehicle; 100, Battery assembly; 200, Controller; 300, Motor; 10, Cell; 11, Electrode; 111, Positive electrode; 112, Negative electrode; 12, Separator; 120, Buffer layer; 121, Separator segment; X, First direction; Y, Second direction. Detailed Implementation

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0057] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0058] 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.

[0059] In the structure of a battery cell, the separator plays a crucial role. Current separator overhang regions do indeed offer good short-circuit protection. The design of the overhang region can, to a certain extent, prevent direct contact between the positive and negative electrodes, thereby reducing the risk of short circuits. During charging and discharging, the battery may experience internal pressure or displacement due to various reasons, and the overhang region provides an additional barrier to ensure isolation between the electrodes.

[0060] However, it cannot be ignored that current separators provide poor protection for the electrode edges. The electrode edges are a relatively fragile area, easily affected by external forces such as impacts and compression. In practical use, electrode edges may experience wear and breakage, leading to decreased battery performance or even safety incidents. Furthermore, the active materials at the electrode edges may react with the separator, affecting the battery's cycle life and safety.

[0061] To alleviate the aforementioned problems, the separator 12 extends circumferentially longer than the electrode 11, and the separator 12 is pleated around the electrode 11 to form a buffer layer 120. This enhances the protection of the electrode 11 edges by the separator 12. When the battery is subjected to external forces, such as collisions or compression, the buffer layer 120 can absorb and disperse the external forces, reducing the direct impact on the electrode 11 edges and lowering the risk of edge breakage. Secondly, the pleated buffer layer 120 of the separator 12 helps improve battery safety. During battery charging and discharging, there may be certain pressure changes and slight expansion and contraction inside the battery. At this time, the pleated separator 12 can provide a certain buffer space to adapt to the changes inside the battery, avoiding poor contact or short circuit between the electrode 11 and the separator 12 due to excessive pressure. Furthermore, this design is beneficial to improving the battery's cycle life. Good edge protection of the electrode 11 can reduce the shedding of active material and damage to the electrode structure, thereby enabling the battery to maintain more stable performance during multiple charge-discharge cycles. Meanwhile, the presence of the buffer layer 120 can also reduce side reactions caused by problems at the edge of the electrode 11, extending the battery's lifespan. Furthermore, this unique structural design can improve the overall reliability of the battery. By enhancing the protection of the electrode 11 edges, potential safety hazards and performance degradation factors are reduced, enabling the battery to operate more stably under various operating environments.

[0062] In summary, the design of extending the separator 12 circumferentially and forming a buffer layer 120 around the electrode 11 can effectively solve the problem of poor edge protection of the electrode 11 provided by the existing separator 12, and provides a strong guarantee for improving the performance and safety of the battery.

[0063] 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.

[0064] The battery cell can be a battery cell, sodium-ion battery, sodium battery cell, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0065] 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.

[0066] 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.

[0067] Please refer to Figure 1 , Figure 1 This 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.

[0068] 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.

[0069] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of this application; please refer to... Figure 3 , Figure 3 This is a cross-sectional view of a battery cell 10 provided in the first embodiment of this application.

[0070] The battery cell includes a casing and a cell 10. The cell 10 is installed inside the casing. The cell 10 includes: an electrode 11 and a separator 12. Multiple electrodes 11 are stacked along a first direction X. The separator 12 is disposed between two adjacent electrodes 11. The circumferential extension length of the separator 12 is greater than the circumferential extension length of the electrode 11, and the separator 12 is folded around the outer periphery of the electrode 11 to form a buffer layer 120.

[0071] The battery cell mainly consists of a casing and a cell 10. The cell 10 is securely installed inside the casing, and the casing protects the cell 10.

[0072] The battery cell 10 comprises several key components, including electrode sheets 11 and separator 12. The electrode sheets 11 are further divided into positive electrode sheets 111 and negative electrode sheets 112, with multiple positive electrode sheets 111 and multiple negative electrode sheets 112 alternately stacked along a first direction X. These electrode sheets 11 are typically made by coating metal foil with an active material (i.e., a current collector). During the charging and discharging process of the battery, the active materials on the positive and negative electrode sheets 112 undergo corresponding chemical reactions, thereby achieving the storage and release of electrical energy. The separator 12 is positioned between adjacent positive and negative electrode sheets 111 and 112, playing a crucial role in isolating them and preventing direct contact between the positive and negative electrode sheets 112, which could lead to a short circuit.

[0073] Furthermore, the circumferential extension length of the separator 12 is greater than that of the electrode 11, and a buffer layer 120 is formed by wrinkles on the outer periphery of the electrode 11. When the battery encounters external impact or internal pressure changes during use, the wrinkled buffer layer 120 can effectively absorb and disperse the external force, providing good protection for the positive and negative electrode 112 and its edges. For example, when the device is accidentally dropped or impacted, the buffer layer 120 can mitigate the impact force, greatly reducing the risk of the positive and negative electrode 112 breaking. Secondly, since the separator 12 extends beyond the edge of the electrode 11 to form the buffer layer 120, even if the positive and negative electrode 112 expands or contracts slightly during battery charging and discharging, the buffer layer 120 can adapt well to this change, always maintaining good contact between the positive and negative electrode 112 and the separator 12, avoiding performance degradation and safety problems caused by poor contact. In addition, this structure can also improve the overall stability and reliability of the battery. It can reduce the contact between the active material at the edge of electrode 11 and the casing, thus reducing the probability of potential side reactions. At the same time, it also provides better adaptability to different operating environments, effectively extending the battery's lifespan.

[0074] In the above example, by extending the circumferential length of the separator 12 to be greater than that of the electrode 11, and by making the separator 12 wrinkle on the outer periphery of the electrode 11 to form a buffer layer 120, the problem of poor edge protection of the electrode 11 by the existing separator 12 can be effectively solved, providing a strong guarantee for improving the performance and safety of the battery.

[0075] Please refer to Figure 3 , Figure 3 This is a cross-sectional view of a battery cell 10 provided in the first embodiment of this application.

[0076] In one embodiment of this application, the extension length of the diaphragm 12 on one side of the electrode 11 in the second direction Y is greater than the extension length of the diaphragm 12 on the other side of the electrode 11 in the second direction Y.

[0077] For example, the second direction Y is Figure 3The vertical direction in this context is understood to be merely for the purpose of describing the technical solution of this application and should not be construed as a limitation thereof. Figure 3 In this example, the side of the second direction Y is the lower side of the electrode 11, or the bottom of the electrode 11, and the other side of the second direction Y is the upper side of the electrode 11, or the top of the electrode 11. In this example, the extension length of the diaphragm 12 at the bottom of the electrode 11 is greater than the extension length at the top of the electrode 11.

[0078] In the above example, the diaphragm 12 on the longer side can extend in a specific direction (e.g., Figure 3 The separator 12 provides stronger protection at the bottom of the electrode 11, reducing the likelihood of problems between the electrode 11 and the separator 12 caused by external factors or internal stress. For example, when the battery may be subjected to external forces in a specific direction, the longer separator 12 extension can better buffer and disperse the external forces, reducing the impact on the electrode 11. At the same time, this design also helps to optimize the internal space utilization of the battery, enabling the battery to achieve more efficient performance within a limited space. In addition, the asymmetrical separator 12 extension can also guide the electric field distribution inside the battery to a certain extent, improving the charging and discharging efficiency and stability of the battery, providing strong support for the reliable operation of the battery.

[0079] In one embodiment of this application, the extension length of the diaphragm 12 on one side of the electrode 11 is equal to the extension length of the diaphragm 12 on the other side of the electrode 11.

[0080] In the example above, this symmetrical design ensures that the electrode 11 receives relatively balanced protection in all directions. Regardless of the direction of external impact, vibration, or internal pressure changes, the electrode 11 remains relatively stable under the protection of the symmetrical separator 12. This helps reduce the risk of deformation and breakage of the electrode 11 due to uneven stress, thereby improving the overall structural stability of the battery. Secondly, from a safety perspective, the equal extension length of the separator 12 ensures that the positive and negative electrodes 112 are effectively isolated in all directions, reducing the possibility of short circuits. During the charging and discharging process, the symmetrical separator 12 maintains good insulation performance, providing reliable protection for the safe operation of the battery. Furthermore, this design also facilitates process standardization in battery manufacturing. Because the separators 12 on both sides have the same length, assembly and quality control are easier during manufacturing, improving production efficiency and product quality consistency.

[0081] In one embodiment of this application, the extension length of the diaphragm 12 on one side of the electrode 11 is L2, and the extension length of the diaphragm 12 on the other side of the electrode 11 is L1, satisfying: ΔL=L2-L1, where 0mm≤ΔL≤10mm.

[0082] For example, L1 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0083] For example, ΔL can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0084] For example, L2 can satisfy: 2mm≤L2≤20mm, and L2 can be 2mm, 6mm, 7mm, 8mm, 11mm, 13mm, 15mm, 16mm, 18mm, or 20mm.

[0085] Assuming L1 takes one of the values ​​mentioned above, and combining it with the value of ΔL, different values ​​of L2 can be obtained. For example, when L1 = 3mm and ΔL = 4mm, L2 = 7mm. Similarly, different combinations of L1 and ΔL can satisfy the relationship L2 = L1 + ΔL, providing a variety of possible parameter choices for battery design.

[0086] In the example above, the reasonable ΔL range ensures that the separator 12 has sufficient extension on both sides of the electrode 11, providing good protection for the electrode 11. During battery operation, it effectively prevents direct contact between the positive and negative electrodes 112, reducing the risk of short circuits. Secondly, the specific extension length relationship allows the separator 12 to better adapt to stress changes inside the battery in different directions. When the battery is subjected to external forces or internal pressure, the longer side of the separator 12 can play a better buffering role, protecting the electrode 11 from damage and improving the safety and stability of the battery. Finally, this design also helps to optimize the battery's spatial layout, improving the battery's energy density and performance.

[0087] In one embodiment of this application, the extension length L1 of the diaphragm 12 on the other side of the second direction Y of the electrode 11 satisfies: 1mm≤L1≤20mm.

[0088] For example, L1 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0089] In the example above, the reasonable range of L1 and ΔL ensures that the separator 12 has sufficient extension on both sides of the electrode 11, providing good protection for the electrode 11. During battery operation, it prevents direct contact between the positive and negative electrodes 112, reducing the risk of short circuits. Secondly, the specific length range allows the separator 12 to better adapt to stress changes inside the battery in different directions. When the battery is subjected to external forces or internal pressure, the separator 12 can act as a buffer, protecting the electrode 11 from damage and improving the safety and stability of the battery. In addition, a suitable extension length can also optimize the spatial layout of the battery, improving the battery's energy density and performance.

[0090] In one embodiment of this application, the diaphragm 12 extends for a length L2 on one side of the electrode 11 in the second direction Y, satisfying: 1mm≤L2≤20mm.

[0091] For example, L2 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm.

[0092] In the example above, the reasonable range of L2 and ΔL ensures that the separator 12 has sufficient extension on both sides of the electrode 11, providing good protection for the electrode 11. During battery operation, it prevents direct contact between the positive and negative electrodes 112, reducing the risk of short circuits. Secondly, the specific length range allows the separator 12 to better adapt to stress changes inside the battery in different directions. When the battery is subjected to external forces or internal pressure, the separator 12 can act as a buffer, protecting the electrode 11 from damage and improving the safety and stability of the battery. In addition, a suitable extension length can also optimize the spatial layout of the battery, improving the battery's energy density and performance.

[0093] In one example, 1mm≤L1≤10mm, 1mm≤L2≤10mm.

[0094] In one example, 1mm≤L1≤10mm, 2mm≤L2≤20mm.

[0095] In one example, 2mm≤L1≤20mm, 1mm≤L2≤10mm.

[0096] In one example, 2mm≤L1≤20mm, 2mm≤L2≤20mm.

[0097] In one embodiment of this application, the battery cell 10 is a stacked battery cell 10, and the buffer layer 120 is located on at least one side of the electrode 11 in the length direction, and / or the buffer layer 120 is located on at least one side of the electrode 11 in the width direction.

[0098] For example, the buffer layer 120 is located on at least one side of the electrode 11 along its length.

[0099] For example, the buffer layer 120 is located on at least one side of the electrode 11 in the width direction.

[0100] For example, the buffer layer 120 is located on at least one side of the length direction of the electrode 11, and the buffer layer 120 is also located on at least one side of the width direction of the electrode 11.

[0101] In the above example, from the perspective of structural stability, the buffer layer 120, positioned along the length and / or width of the electrode 11, provides comprehensive protection for the electrode 11. Whether during battery assembly or subsequent use and transportation, it effectively reduces the risk of damage to the electrode 11 due to external impacts. For example, when the battery is accidentally bumped or squeezed, the buffer layer 120 can absorb and disperse the external force, preventing the electrode 11 from deforming or cracking, thereby maintaining the overall structural integrity of the battery.

[0102] Furthermore, for the stacked cell 10, this design can also improve production efficiency and product quality consistency. During the manufacturing process, the buffer layer 120 can make the stacking of the electrode sheets 11 more regular, which facilitates automated production operations, reduces the defect rate caused by problems such as misalignment and deformation of the electrode sheets 11, and thus reduces production costs.

[0103] In one embodiment of this application, the battery cell 10 is a wound battery cell 10, and the buffer layer 120 is located at the bottom of the battery cell 10, or the buffer layer 120 is located at both the bottom and top of the battery cell 10.

[0104] When the battery cell 10 is a wound battery cell 10, if the buffer layer 120 is located at the bottom of the battery cell 10, the bottom often bears more pressure during battery use. The presence of the buffer layer 120 can effectively alleviate this pressure and protect the electrode 11 from damage. It can absorb and disperse external impact forces, reducing the risk of the electrode 11 deforming or cracking due to pressure. Secondly, the bottom buffer layer 120 helps improve the stability of the battery. During battery charging and discharging, the temperature at the bottom is usually relatively high. The buffer layer 120 can play a certain role in heat insulation, preventing excessive heat concentration, thereby maintaining the internal temperature stability of the battery. At the same time, it can also reduce the expansion and contraction of the electrode 11 caused by temperature changes, extending the battery's service life.

[0105] The effect is even more pronounced if the buffer layer 120 is located at both the bottom and top of the cell 10. In addition to the advantages of the bottom buffer layer 120, the top buffer layer 120 also provides some protection for the electrode 11. For example, when the battery is subjected to vibration or inverted, the top buffer layer 120 can prevent the electrode 11 from colliding with other components, further enhancing battery safety. Furthermore, the combined effect of the top and bottom buffer layers 120 allows for better adaptation to changes in the battery's operating environment, improving the overall performance and reliability of the battery.

[0106] In the above example, by providing a buffer layer 120 at the bottom of the wound cell 10 or at both the bottom and top of the cell 10, the impact force from the outside can be effectively absorbed and dispersed. This effectively protects the electrode 11 from damage.

[0107] In one embodiment of this application, the diaphragm 12 includes a plurality of diaphragm segments 121 spaced apart along a first direction X. Two adjacent diaphragm segments 121 are adapted to be stacked in a second direction Y so that the plurality of diaphragm segments 121 are fixedly connected to form a buffer layer 120.

[0108] In the above example, different separator segments 121 can be flexibly adjusted according to the specific shape and stress conditions of the electrode 11, better adapting to the complex environment inside the battery. When the battery is subjected to external impact, each separator segment 121 can independently absorb and disperse energy, reducing the risk of damage to the electrode 11. Secondly, the stacked and fixed connection of adjacent separator segments 121 improves the stability of the buffer layer 120. During battery use, the separator segments 121 will not separate or misalign due to factors such as vibration or temperature changes, always maintaining effective protection for the electrode 11. At the same time, this connection method also makes the structure of the buffer layer 120 more compact, saving space inside the battery. Furthermore, the combination of multiple separator segments 121 can better control the buffering effect. By adjusting the number, thickness, and stacking method of the separator segments 121, different levels of buffering performance can be achieved to meet the needs of different application scenarios.

[0109] In one embodiment of this application, a plurality of diaphragm segments 121 are heat-fused or glued together.

[0110] For example, heat fusion bonding enables a strong and uniform connection between the separator segments 121. During the heat fusion process, the separator 12 materials fuse together, resulting in a high connection strength that is not easily separated. This connection method ensures that the buffer layer 120 maintains a stable structure throughout battery use, effectively protecting the electrode 11 even under external impact, vibration, or temperature changes. Simultaneously, the heat fusion connection provides good sealing, preventing impurities from entering the gaps between the separator segments 121 and reducing the risk of short circuits or other malfunctions within the battery.

[0111] For example, adhesive bonding provides a flexible connection method. A suitable adhesive can be selected based on different diaphragm 12 materials and application requirements to achieve a reliable connection. Adhesive bonding is relatively simple to operate, low in cost, and can be performed without compromising the performance of the diaphragm 12. The adhesive can also fill the tiny gaps between the diaphragm segments 121, further improving the integrity and buffering effect of the buffer layer 120. Furthermore, some high-performance adhesives possess excellent heat resistance and chemical corrosion resistance, enabling them to adapt to various harsh working environments and enhancing the reliability and durability of the battery.

[0112] In the above examples, both hot-melt bonding and adhesive bonding can effectively ensure that the buffer layer 120 maintains a stable structure during battery use, and can effectively protect the electrode 11 even under external impact, vibration or temperature changes.

[0113] In one embodiment of this application, the buffer layer 120 of the diaphragm 12 on one side of the electrode 11 in the second direction Y is a first buffer layer, and the buffer layer 120 of the diaphragm 12 on the other side of the electrode 11 in the second direction Y is a second buffer layer. A plurality of diaphragm segments 121 of the first buffer layer are fixedly connected, and / or, a plurality of diaphragm segments 121 of the second buffer layer are fixedly connected.

[0114] Reference Figure 3 The second direction Y is the vertical direction, with one side of the second direction Y being the lower side of the electrode 11 and the other side of the second direction Y being the upper side of the electrode 11.

[0115] For example, the extension length L1 of the diaphragm 12 on the upper side of the electrode 11 is 1 to 10 mm, and the extension length L2 of the diaphragm 12 on the lower side of the electrode 11 is 2 to 10 mm, and satisfies: L1 < L2, wherein:

[0116] Example 1: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated. The second buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated.

[0117] Example 2: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0118] Example 3: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0119] Example 4: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is constructed by multiple diaphragm segments 121 in a pleated manner.

[0120] Example 5: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0121] Example 6: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0122] Example 7: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0123] For example, the extension length L1 of the diaphragm 12 on the upper side of the electrode 11 is 2-10 mm, and the extension length L2 of the diaphragm 12 on the lower side of the electrode 11 is 2-10 mm, and satisfies: L1 < L2, wherein:

[0124] Example 1: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated. The second buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated.

[0125] Example 2: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0126] Example 3: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0127] Example 4: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is constructed by multiple diaphragm segments 121 in a pleated manner.

[0128] Example 5: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0129] Example 6: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0130] Example 7: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0131] For example, the extension length L1 of the diaphragm 12 on the upper side of the electrode 11 is 1 to 10 mm, and the extension length L2 of the diaphragm 12 on the lower side of the electrode 11 is 1 to 10 mm, and satisfies: L1 < L2, wherein:

[0132] Example 1: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated. The second buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated.

[0133] Example 2: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0134] Example 3: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0135] Example 4: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is constructed by multiple diaphragm segments 121 in a pleated manner.

[0136] Example 5: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0137] Example 6: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0138] Example 7: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0139] For example, the extension length L1 of the diaphragm 12 on the upper side of the electrode 11 is 2-10 mm, and the extension length L2 of the diaphragm 12 on the lower side of the electrode 11 is 2-10 mm, satisfying: L1 = L2, where:

[0140] Example 1: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated. The second buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated.

[0141] Example 2: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0142] Example 3: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0143] Example 4: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is constructed by multiple diaphragm segments 121 in a pleated manner.

[0144] Example 5: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0145] Example 6: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0146] Example 7: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0147] For example, the extension length L1 of the diaphragm 12 on the upper side of the electrode 11 is 1 to 10 mm, and the extension length L2 of the diaphragm 12 on the lower side of the electrode 11 is 1 to 10 mm, and satisfies: L1 = L2, where:

[0148] Example 1: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated. The second buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated.

[0149] Example 2: The first buffer layer is constructed by multiple diaphragm segments 121, all of which are pleated, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0150] Example 3: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0151] Example 4: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is constructed by multiple diaphragm segments 121 in a pleated manner.

[0152] Example 5: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0153] Example 6: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding.

[0154] Example 7: The first buffer layer is fixedly connected by multiple diaphragm segments 121 through adhesive bonding, and the second buffer layer is fixedly connected by multiple diaphragm segments 121 through heat fusion.

[0155] In the above example, the buffer layer 120 can be effectively ensured to maintain a stable structure during battery use, and the electrode 11 can be effectively protected even under external impact, vibration or temperature change.

[0156] In one embodiment of this application, the electrode 11 includes a positive electrode 111, which includes a positive current collector and a positive active material layer disposed on at least one side of the positive current collector. The positive current collector includes a polymer matrix and conductive layers disposed on both sides of the polymer matrix. The polymer matrix has through holes, and the conductive layers at least partially fill the interior of the through holes.

[0157] For example, the conductive layer includes: a ternary material, a conductive agent, a binder, and a dispersant, wherein the mass ratio of the ternary material, the conductive agent, the binder, and the dispersant is (0.8-0.99):(0.002-0.005):(0.0005-0.005):0-0.001).

[0158] The polymer matrix has through-holes, and the conductive layer at least partially fills the interior of these holes, improving electron transport efficiency. The porous structure facilitates electrolyte permeation and rapid ion diffusion, thereby enhancing the battery's charge-discharge performance.

[0159] The ternary material in the conductive layer, as the main component, has high specific capacity and good electrochemical performance, enabling it to store more energy. Within a specific mass ratio range, the proportion of ternary material of 0.8-0.99 ensures that the cathode 111 has sufficient capacity to meet the high energy density requirements of various electronic devices.

[0160] The addition of conductive agent, although only accounting for 0.002-0.005%, can effectively improve the conductivity of the conductive layer, reduce the internal resistance of the battery, make the current transmission inside the battery smoother, and improve the power output of the battery.

[0161] When the binder is in the mass ratio range of 0.0005-0.005, it can firmly bond the ternary material and conductive agent to the porous current collector body, preventing the active material from falling off during battery use and ensuring the battery's cycle life and stability. The appropriate use of a dispersant can ensure uniform dispersion of the components, further optimizing the performance of the conductive layer and ensuring the consistency and reliability of battery performance.

[0162] In the above example, the polymer matrix has through-holes, and the conductive layer at least partially fills the interior of the through-holes, improving electron transport efficiency. The porous structure facilitates electrolyte permeation and rapid ion diffusion, thereby enhancing the battery's charge and discharge performance.

[0163] In one embodiment of this application, the positive electrode active material in the positive electrode active material layer includes the compound Li as shown in the following molecular formula. a Ni x Co y Mn z M b O2, wherein 0.60≤a≤1.20, 0.80≤x≤0.98, y>0, z>0, 0.001≤b≤0.02, and M includes at least one of Al, Zr, Mg, Zn, Y, Fe, Nb, W, Zn, Mo, Ba, Ca, Ta and Ti.

[0164] For example, the conductive agent is at least one of conductive carbon black, graphene, or carbon nanotubes, the binder is polyvinylidene fluoride, and the dispersant is a surfactant.

[0165] Li a Ni x Co y Mn z M b The specific component ratio range in O2 ensures high capacity and good electrochemical performance. A suitable lithium content (0.60 ≤ a ≤ 1.20) guarantees the battery's energy storage capacity. The appropriate ratio range of nickel, cobalt, and manganese gives the 111 cathode high specific capacity and stability. The addition of trace amounts of manganese improves the material's structural stability and electrochemical performance.

[0166] Conductive carbon black or carbon nanotubes are used as conductive agents to effectively improve the conductivity of the conductive layer and reduce internal resistance. Polyvinylidene fluoride (PVDF) is used as a binder with strong adhesion, firmly bonding the active material to the current collector. The dispersant, a surfactant, ensures uniform dispersion of the components, improving the consistency of the positive electrode's performance. This combination of materials results in higher energy density, better charge / discharge performance, and longer cycle life for the battery.

[0167] In the example above, Li a Ni x Co y Mn z M b The specific component ratios in O2 ensure high capacity and stability, while added trace elements improve performance. Conductive agents enhance conductivity, binders firmly bond active materials, and dispersants ensure uniform dispersion of components. These combined effects improve battery energy density, charge / discharge performance, and cycle life.

[0168] In some embodiments of this application, the mass percentage of the conductive agent is 0.2% to 0.5%.

[0169] In the above example, the mass percentage of the conductive agent that meets the above conditions can effectively improve electrode conductivity, ensure rapid electron transport, and facilitate battery charging and discharging. If the mass percentage of the conductive agent is too low, the conductivity will be insufficient; if the mass percentage is too high, it may affect the proportion of active material and reduce battery capacity. This proportion balances conductivity with other performance characteristics.

[0170] In some embodiments of this application, the compaction density of the positive electrode active material layer is 3.45 g / cm³. 3 Up to 3.8 g / cm 3 .

[0171] In the examples above, a higher compaction density means that more active material can be accommodated in the same volume, thereby increasing the battery's energy density. This allows the battery to provide longer-lasting power to electronic devices. At the same time, a suitable compaction density helps maintain the stability of the electrode structure, reducing structural damage caused by the expansion and contraction of active material during charging and discharging, and extending the battery's cycle life. Furthermore, it optimizes the utilization of the battery's internal space, making the battery design more compact and efficient.

[0172] In some embodiments of this application, the energy density of a single battery cell is between 750Wh / L and 950Wh / L.

[0173] In the examples above, high energy density allows batteries to store more energy in the same volume, providing longer battery life for electronic devices. At the same time, it allows for smaller battery sizes, making devices thinner and more portable, thus improving the user experience.

[0174] This application also proposes a battery device 100 having the battery cells described in the above embodiments.

[0175] In one embodiment of this application, a battery device 100 includes a housing and a battery cell, with at least one battery cell installed inside the housing.

[0176] In the above example, the buffer layer 120 provides additional protection for the battery cells. When the battery device 100 is subjected to external impact or vibration, it can effectively absorb and disperse energy, reducing the risk of damage to the battery cells and thus improving the structural stability of the entire battery device 100. On the other hand, the buffer layer 120 helps maintain the good condition of the electrode plates 11 inside the battery cells. During the use of the battery device 100, the buffer layer 120 can adapt to the expansion and contraction of the electrode plates 11, reducing the performance degradation caused by the deformation of the electrode plates 11 and extending the service life of the battery cells and the entire battery device 100. At the same time, the presence of the buffer layer 120 can also enhance the safety of the battery device 100, reduce the probability of safety accidents such as short circuits, and enable the battery device 100 to operate more reliably in various application scenarios, providing users with a stable power supply.

[0177] 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.

[0178] 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.

[0179] This application also proposes an electrical device having the battery device 100 of the above embodiments.

[0180] According to the embodiments of this application, the power-consuming device may include a battery device 100, which is used to store or provide electrical energy.

[0181] In the above example, by providing the battery device 100 described above, the power supply device of this application can have higher performance and a longer service life.

[0182] 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.

[0183] 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.

[0184] 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 in that, include: case; A battery cell (10), the battery cell (10) being installed within the housing, the battery cell (10) comprising: Electrode (11), a plurality of said electrode (11) are stacked along a first direction (X); A diaphragm (12) is disposed between two adjacent electrodes (11). The diaphragm (12) extends in the circumferential direction for a longer than the electrode (11) extends in the circumferential direction, and the diaphragm (12) forms a buffer layer (120) by wrinkling around the electrode (11).

2. The battery cell according to claim 1, characterized in that, The length of the diaphragm (12) extending on one side of the electrode (11) in the second direction (Y) is greater than or equal to the length of the diaphragm (12) extending on the other side of the electrode (11) in the second direction (Y).

3. The battery cell according to claim 2, characterized in that, The extension length of the diaphragm (12) on one side of the electrode (11) is L2, and the extension length of the diaphragm (12) on the other side of the electrode (11) is L1, satisfying: ΔL=L2-L1, where 0mm≤ΔL≤10mm.

4. The battery cell according to claim 3, characterized in that, The extension length of the diaphragm (12) on the other side of the electrode (11) is L1, which satisfies the following condition: 1mm≤L1≤20mm.

5. The battery cell according to claim 3 or 4, characterized in that, The extension length of the diaphragm (12) on one side of the electrode (11) is L2, which satisfies: 1mm≤L2≤20mm.

6. The battery cell according to any one of claims 1-5, characterized in that, The battery cell (10) is a laminated battery cell (10). The buffer layer (120) is located on at least one side of the pole piece (11) along its length, and / or, The buffer layer (120) is located on at least one side of the electrode (11) in the width direction.

7. The battery cell according to any one of claims 1-5, characterized in that, The battery cell (10) is a wound battery cell (10), and the buffer layer (120) is located at the bottom of the battery cell (10) or at the bottom and top of the battery cell (10).

8. The battery cell according to any one of claims 1-5, characterized in that, The diaphragm (12) includes a plurality of diaphragm segments (121) spaced apart along a first direction (X), and two adjacent diaphragm segments (121) are adapted to be stacked on each other in a second direction (Y) so that the plurality of diaphragm segments (121) are fixedly connected to each other to form the buffer layer (120).

9. The battery cell according to claim 8, characterized in that, The multiple diaphragm segments (121) are heat-fused or glued together.

10. The battery cell according to claim 8 or 9, characterized in that, The diaphragm (12) has a buffer layer (120) on one side of the electrode (11) in the second direction (Y) as a first buffer layer, and the diaphragm (12) has a buffer layer (120) on the other side of the electrode (11) in the second direction (Y) as a second buffer layer. The plurality of diaphragm segments (121) of the first buffer layer are fixedly connected, and / or the plurality of diaphragm segments (121) of the second buffer layer are fixedly connected.

11. The battery cell according to any one of claims 1-10, characterized in that, The electrode (11) includes a positive electrode (111), the positive electrode (111) includes a positive current collector and a positive active material layer disposed on at least one side of the positive current collector, the positive current collector including: A polymer matrix and conductive layers disposed on both sides of the polymer matrix, the polymer matrix having through-holes, the conductive layers at least partially filling the interior of the through-holes.

12. The battery cell according to claim 11, characterized in that, The positive electrode active material in the positive electrode active material layer includes a compound with the following molecular formula: Li a Ni x Co y Mn z M b O2, wherein 0.60≤a≤1.20, 0.80≤x≤0.98, y>0, z>0, 0.001≤b≤0.02, and M includes at least one of Al, Zr, Mg, Zn, Y, Fe, Nb, W, Zn, Mo, Ba, Ca, Ta and Ti.

13. The battery cell according to claim 12, characterized in that, The positive electrode active material layer also includes a conductive agent, which includes at least one of conductive carbon black, graphene, or carbon nanotubes.

14. The battery cell according to claim 13, characterized in that, The conductive agent has a mass percentage of 0.2% to 0.5%.

15. The battery cell according to claim 11, characterized in that, The compaction density of the positive electrode active material layer is 3.45 g / cm³. 3 Up to 3.8 g / cm 3 .

16. The battery cell according to claim 1, characterized in that, The energy density of the battery cells ranges from 750Wh / L to 950Wh / L.

17. A battery device (100), characterized in that, include: The battery cell according to any one of claims 1-16.

18. An electrical appliance, characterized in that, Includes the battery device (100) of claim 17, the battery device (100) being used to release or store electrical energy.

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