Battery and electronic device

Abstract

Embodiments of the present application provide a battery and an electronic device, and relate to the technical field of batteries. The shell of the battery has a containing cavity. A first main body of a first pole core unit is arranged in the containing cavity. A second pole core unit is arranged in the containing cavity and is stacked on a first surface of the first main body along a first direction. The second pole core unit is electrically connected to the first pole core unit in the containing cavity. In a direction from the second pole core unit to the first pole core unit, a projection of the second pole core unit is located in a projection range of the first main body. The second pole core unit and the first main body form a bearing part and a non-bearing part. The second pole core unit is located in the bearing part. One end of a first tab assembly is arranged on the first main body and is located in a part of the non-bearing part. The other end of the first tab assembly passes through the containing cavity and extends to the outside of the shell. The battery provided by the present application can improve the flexibility of arranging the first tab assembly on the first main body.

Description

Technical Field

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

[0002] With the continuous increase in the demand for battery capacity and charging power in consumer electronics products, existing battery structure designs face multiple challenges. In order to make full use of the internal space of electronic devices, batteries adopt irregular shapes, which mainly rely on stacking technology to achieve their purpose.

[0003] The irregularly shaped battery includes a casing, multiple electrode cores with different surface areas, and electrode tabs. The multiple electrode cores are stacked and form a trapezoidal structure. The electrode tabs connect the multiple electrode cores and extend out of the casing.

[0004] However, the tab assembly in the battery of the aforementioned related technologies has poor flexibility in its placement, which is not conducive to the adaptation of the battery to the internal space of electronic devices. Utility Model Content

[0005] This application provides a battery and an electronic device that can improve the flexibility of the tab assembly's placement on the core unit and enhance the compatibility between the battery and the internal space of the electronic device.

[0006] This application provides a battery comprising:

[0007] The outer shell has a receiving cavity;

[0008] The first electrode core unit includes a first electrode ear assembly and a first body, wherein the first body is disposed within the receiving cavity;

[0009] The first body includes a first surface and a second surface opposite to each other along a first direction, wherein the first direction is the thickness direction of the first body;

[0010] The second electrode core unit is disposed in the receiving cavity and stacked on the first surface of the first body along the first direction. The second electrode core unit is electrically connected to the first electrode core unit in the receiving cavity.

[0011] Along the direction from the second pole core unit to the first pole core unit, the projection of the second pole core unit is located within the projection range of the first body. The second pole core unit and the first body form a supporting part and a non-supporting part, with the second pole core unit located in the supporting part. One end of the first pole tab assembly is disposed on the portion of the first body located in the non-supporting part, and the other end of the first pole tab assembly passes through the receiving cavity and extends to the outside of the housing.

[0012] This application provides a battery solution that innovatively designs the spatial layout of the supporting and non-supporting parts by constructing a battery structure with a stepped thickness distribution. A bipolar core unit stacked structure is arranged within the housing cavity of the outer casing, wherein the first main body serves as the basic supporting layer, and the second core units stacked on its surface are completely contained within the first main body in projection, forming a stepped thickness difference. This stacked design ensures that the second core units are naturally located in the thicker area of ​​the battery, while the non-supporting part of the first main body corresponds to the thinner area.

[0013] In particular, the placement of the first tab assembly breaks with traditional design constraints, fixing its root to the surface of the first main body in the non-supporting section, with its end extending through the receiving cavity to the outside of the housing. This arrangement fully utilizes the spatial characteristics of the non-supporting section, allowing the first tab assembly to emerge from the thinner side of the battery, overcoming the limitation of existing technology that requires it to emerge from the thickest side. The stacked design of the supporting section ensures effective electrical connection between the first and second electrode core units, while the non-supporting section provides independent placement space for the first tab assembly, avoiding physical interference with the second electrode core unit and maintaining a complete electrode connection path.

[0014] By controlling the projection range, spatial partitioning management of the core units is achieved. The support structure ensures the reliable connection between the first and second core units. The non-support structure creates new space for the first tab assembly, ultimately achieving the technical effect of leading out the first tab assembly from the non-maximum thickness side. This structural design maintains the overall energy density of the battery while providing greater freedom in the overall structural design, especially in the expansion of irregularly shaped batteries.

[0015] In one possible implementation, the first body includes a plurality of first positive electrode plates and a plurality of first negative electrode plates, wherein the first positive electrode plates and the first negative electrode plates are alternately stacked along the first direction;

[0016] The first electrode assembly includes a first positive electrode and a first negative electrode, wherein the first positive electrode is electrically connected to each of the first positive electrode plates, and the first negative electrode is electrically connected to each of the first negative electrode plates;

[0017] The second electrode core unit includes a second electrode assembly and a second body. The second body is disposed on the support portion. The second electrode assembly is electrically connected to the second body, and the second electrode assembly is electrically connected to at least one first positive electrode and at least one first negative electrode within the support portion.

[0018] This design constructs the first main body using alternating layers of first positive and first negative electrodes, ensuring uniform charge transfer and providing a standardized interface for the subsequent integration of the first tab assembly. Secondly, by limiting the second tab assembly of the second core unit to only connect with at least one first positive and one first negative electrode from the first core unit, rather than connecting with all corresponding electrodes as in traditional designs, the complexity of the connection process is significantly reduced. Specifically, the alternating arrangement of the first positive and first negative electrodes allows for batch connection of the tab assemblies using uniform welding parameters, while the selective connection of the second tab assembly to single or a small number of electrodes reduces the possibility of assembly error accumulation by decreasing the number of connection points. This design not only retains the high energy density advantage of the stacked structure but also improves production yield by simplifying the connection path, while providing a structural basis for the expansion of irregular battery forms.

[0019] In one possible implementation, the second entity includes:

[0020] Multiple second positive electrode plates and multiple second negative electrode plates are alternately stacked along the first direction;

[0021] The second electrode assembly includes a second positive electrode and a second negative electrode, wherein the second positive electrode is electrically connected to each of the second positive electrode plates, and the second negative electrode is electrically connected to each of the second negative electrode plates;

[0022] The second positive electrode tab is electrically connected to at least one of the first positive electrode plates, and the second negative electrode tab is electrically connected to at least one of the first negative electrode plates.

[0023] This technical solution constructs a complete electrochemical reaction system through the alternating stacking structure of the second positive and second negative electrode plates within the second main body. Simultaneously, the direct connection between the second tab assembly and all the second positive and second negative electrode plates ensures uniform current distribution. Specifically, the electrical connection between the second positive tab and each second positive electrode plate allows the current generated by the second main body to converge to the second positive tab through a unified path. The design of this tab further connecting to at least one first positive electrode plate achieves seamless connection between the second and first main bodies at the potential level. This layered, progressive connection method avoids impedance differences caused by the dispersed tab welding points in traditional stacking processes and ensures connection reliability through the redundant design of "at least one". The symmetrical design on the negative electrode side maintains the balance of the charge transport path, preventing local overheating or abnormal potential differences. Notably, this solution does not employ integral welding or complex conductive components, but rather uses direct correspondence between the tab and the electrode plate, simplifying the manufacturing process while improving space utilization. This synergizes with the need for compact structures in irregularly shaped batteries.

[0024] In one possible implementation, the first positive electrode has a first lead-out piece on the side facing the support portion, and the first negative electrode has a second lead-out piece on the side facing the support portion.

[0025] The second positive electrode is electrically connected to the first lead of at least one of the first positive electrode plates, and the second negative electrode is electrically connected to the second lead of at least one of the first negative electrode plates.

[0026] This technical solution integrates the first lead sheet directly into the end of the first positive electrode and the second lead sheet into the end of the first negative electrode, forming an integrated conductive structure of the first lead sheet and the first positive electrode, and vice versa. This design firstly, through a die-cutting process, the first lead sheet is simultaneously formed during the fabrication of the first positive electrode, maintaining material continuity between the first lead sheet and the main body of the first positive electrode. This avoids the steps of separately processing, positioning, and welding connectors required in traditional solutions, thus reducing assembly processes and the number of components. Secondly, as an extension of the first positive electrode, the geometry of the first lead sheet matches the main body of the first positive electrode, providing a larger contact area. This provides a more stable connection interface for welding or crimping the second positive electrode tab to the first positive electrode, reducing contact resistance and improving connection strength. Furthermore, the integrated design of the first lead sheet results in a shorter and more uniform current path, reducing the risk of excessively high local current density and thus improving current conduction efficiency. This structural innovation achieves a synergistic improvement in electrical connection reliability and manufacturing efficiency without increasing additional space requirements. The connection and design between the second lead and the first negative electrode can also achieve the same technical effect as the first lead.

[0027] One possible implementation also includes a connection component;

[0028] One end of the connecting component is electrically connected to the second electrode assembly, and the other end is electrically connected to at least one of the first positive electrode plates and at least one of the first negative electrode plates.

[0029] This solution transforms the direct, rigid connection between the second tab assembly and the first positive and negative electrodes into a flexible, transitional connection by introducing an independent connecting component as an intermediate conductive medium. One end of the connecting component forms a stable connection with the second tab assembly, while the other end establishes current paths with at least one of the first positive and negative electrodes. This layered connection structure achieves three levels of technical benefits: First, the connecting component, as an independent conductor, can utilize materials with higher conductivity or a larger cross-sectional area, directly enhancing current carrying capacity. Second, the segmented connection disperses welding stress, avoiding the risk of weld breakage due to thermal expansion differences. Finally, the standardized design of the connecting component reduces spatial constraints between the second tab assembly and the first electrode, allowing for efficient electrical connections across a wider geometric range. This structural innovation is particularly suitable for the complex electrical connection requirements of different stacked regions in irregularly shaped stepped batteries, maintaining the space utilization advantage of the built-in tabs while solving the reliability challenges in high-current scenarios.

[0030] In one possible implementation, the connection component further includes:

[0031] The first connector has one end electrically connected to the second positive electrode tab and the other end electrically connected to at least one of the first positive electrode plates;

[0032] The second connector has one end electrically connected to the second negative electrode tab and the other end electrically connected to at least one of the first negative electrode plates.

[0033] This solution splits the connection assembly into two independent connectors, a first connector and a second connector, each responsible for current transmission to the positive and negative electrodes, respectively. The first connector specifically optimizes the conductive path between the second positive tab and the first positive electrode, with its two ends connecting to the corresponding electrodes of different tab assemblies. This dedicated design avoids mutual interference between positive and negative currents in a shared path. The second connector uses the same principle to achieve independent connection of the negative electrode system, creating complete physical isolation between the positive and negative conductive paths. This split design not only improves overall current carrying capacity through independent paths but also reduces the deformation impact of the connectors on the electrodes by dispersing mechanical stress. Furthermore, the choice of flexible conductive components further eliminates the risk of puncture that may arise from rigid connections. The synergistic effect of the two connectors optimizes the uniformity of current distribution, reduces the contact impedance at the connection interface, and ultimately improves charging power.

[0034] In one possible implementation, the first connector is a first flexible conductive element;

[0035] The second connector is a second flexible conductive element.

[0036] This technical solution optimizes and improves the internal electrical connection structure of the battery by using flexible conductive components as the core material for the connecting parts. Specifically, the first flexible conductive component, serving as the positive electrode connection medium, effectively buffers assembly stress due to its bendable and deformable characteristics, avoiding localized stress concentration that may occur with rigid contact in traditional metal connectors. Similarly, the second flexible conductive component, serving as the negative electrode connection medium, adapts to deformation caused by thermal expansion and contraction during battery cycling, thus maintaining stable electrical connection performance. This combination design of dual flexible conductive components ensures the conductivity efficiency of the positive and negative electrode connection channels while eliminating the risk of physical damage that may be caused by rigid connectors through material properties. The foldability of the flexible material also allows for flexible placement of connectors within the complex internal space of the battery, providing greater freedom for the design of irregularly shaped battery structures.

[0037] In one possible implementation, in the bearing portion, the second body is offset from the first body along the first direction to form a clearance area, and a portion of the second tab assembly is bent within the clearance area.

[0038] This technical solution creates a clearance zone by staggering the second main body and the first main body along a first direction in the support portion, allowing the bent portion of the second tab assembly to be embedded within this clearance zone. This design solves the redundancy problem caused by the space occupied by the connecting structure when two electrode core units are stacked: First, the staggered arrangement naturally creates a clearance zone between the second and first main bodies by adjusting their relative positions, providing space for the tab assembly without the need for additional structural components. Second, positioning the bent portion of the second tab assembly within the clearance zone makes the stacking direction of the connecting structure and the electrode core unit spatially complementary, avoiding the problem of the tab assembly needing to occupy additional external space in traditional stacked structures. This space utilization method ensures a stable electrical connection between the second tab assembly and the first electrode core unit while avoiding volume expansion caused by the connecting structure, thus improving the utilization rate of the battery's internal space while maintaining high energy density. By embedding the connecting structure within the staggered gap of the electrode core unit, the mechanical stress interference of the battery casing on the connecting area is also reduced, improving structural reliability.

[0039] In one possible implementation, the housing includes:

[0040] A first receiving portion is used to receive the second pole core unit and the portion of the first body that overlaps with the second pole core unit;

[0041] The second receiving portion, along the first direction, has a thickness smaller than the size of the first receiving portion, and is used to receive the portion of the first body that does not overlap with the second pole core unit.

[0042] This solution optimizes the adaptability of the casing structure by setting receptacles with varying thicknesses. Specifically, the first receptacle is designed to accommodate the thickness requirements of the supporting portion, and its size is sufficient to fully accommodate the large thickness area formed by the stacking of the first main body and the second electrode core unit. The second receptacle corresponds to the single-layer thickness characteristics of the non-supporting portion, and its smaller thickness parameter matches the actual space requirements of the non-supporting portion. This regional thickness design allows the casing to closely fit the physical characteristics of different areas inside the battery, avoiding the gaps that occur in thinner areas of traditional uniform-thickness casings, thereby effectively reducing the overall volume while ensuring the integrity of the battery structure. By setting the thickness parameter of the second receptacle to be smaller than that of the first receptacle, not only is precise utilization of casing material achieved, but more usable space is also freed up for the layout of other components inside the electronic device, ultimately achieving the technical goal of improving space utilization.

[0043] This application also provides an electronic device, which includes a device body and a battery as described above. Attached Figure Description

[0044] Figure 1 A cross-sectional schematic diagram of the first type of battery provided in an embodiment of this application;

[0045] Figure 2 This application provides a schematic diagram of the structure of a battery after the first and second electrode core units are stacked.

[0046] Figure 3 A cross-sectional schematic diagram of a second type of battery provided in an embodiment of this application;

[0047] Figure 4 A cross-sectional schematic diagram of a third type of battery provided in an embodiment of this application;

[0048] Figure 5 for Figure 4 A schematic diagram showing the connection between the second negative electrode tab and the second lead-out piece of the battery.

[0049] Figure 6 This is a cross-sectional schematic diagram of the fourth type of battery provided in the embodiments of this application.

[0050] Explanation of reference numerals in the attached figures:

[0051] 100. Outer shell;

[0052] 110. Receiving cavity; 120. First receiving part; 130. Second receiving part;

[0053] 200. First core unit;

[0054] 210, First electrode assembly; 220, First main body; 230, Supporting part; 240, Non-supporting part;

[0055] 211. First positive electrode tab; 212. First negative electrode tab; 221. First surface; 222. Second surface;

[0056] 223. First positive electrode plate; 224. First negative electrode plate;

[0057] 2231, First lead-out film; 2241, Second lead-out film;

[0058] 300, Second Pole Core Unit;

[0059] 310. Second electrode assembly; 320. Second main body;

[0060] 311. Second positive electrode tab; 312. Second negative electrode tab; 321. Second positive electrode plate; 322. Second negative electrode plate;

[0061] 400. Avoidance Zone. Detailed Implementation

[0062] As mentioned in the background section, the existing battery casing has a large volume and space occupancy, resulting in a large space occupancy of the battery and affecting the battery's capacity.

[0063] The reason for this problem lies in the contradiction between electrode lead placement and capacity utilization in the structural design of irregularly shaped batteries in the field of consumer electronics battery applications. Existing stacked battery technology is limited by the tab welding process, requiring the positive and negative tabs to extend from the side with the thickest cell. When the battery body adopts a stepped thickness distribution, the electrode assembly in the thinner areas cannot form an effective electrical connection, resulting in the inability to activate and utilize the capacity of the electrode material in those areas. This structural defect not only wastes electrode material space but also limits the adaptability of the battery form to the overall device structure. Especially in battery compartment designs requiring asymmetrical thickness distribution, it is difficult to simultaneously optimize battery energy density and overall space utilization.

[0064] Taking smartphone battery compartment design as an example, when the motherboard adopts a stepped layout, the tabs of existing irregularly shaped batteries must be placed on the thickest side of the battery. This necessitates reserving extra space at the battery compartment steps to accommodate the tab assembly, thereby compressing the area for adjacent electronic components. Specifically, in battery structures with a thickness difference, if the tabs are forcibly led out from the thinner side, electrical connection breaks will occur in the stacked areas of the internal electrode assembly, preventing some electrode materials from participating in the electrochemical reaction. Ultimately, this results in the battery's actual capacity being lower than the design value. This defect is particularly prominent in compact electronic devices that require high space utilization, directly hindering the coordinated optimization of battery form and overall device structure.

[0065] Continuing to use the existing stacked battery structure will force battery design to make trade-offs between energy density and structural adaptability. Specifically: First, the battery compartment shape must accommodate the limitations of the tab lead-out positions, increasing constraints on the overall structural design; second, abandoning stepped thickness design to ensure capacity utilization will increase the spatial gap between the battery and the motherboard; finally, ineffective accumulation of electrode materials in non-load-bearing areas will reduce the overall energy density of the battery and increase internal resistance, leading to greater difficulty in thermal management. These combined technical consequences significantly limit the application of irregularly shaped batteries in high-power fast charging scenarios.

[0066] To address the aforementioned technical problems, this application provides a battery and electronic device. This technical solution innovatively designs the spatial layout of the supporting and non-supporting portions by constructing a battery structure with a stepped thickness distribution. A bipolar core unit stacked structure is arranged within the housing cavity, where a first main body serves as the basic supporting layer. The second core unit stacked on its surface is completely contained within the first main body in projection, forming a stepped thickness difference. This stacked design ensures that the second core unit is naturally located in the thicker area of ​​the battery, while the non-supporting portion of the first main body corresponds to the thinner area.

[0067] In particular, the placement of the first tab assembly breaks with traditional design constraints, fixing its root to the surface of the first main body in the non-supporting section, with its end extending through the receiving cavity to the outside of the housing. This arrangement fully utilizes the spatial characteristics of the non-supporting section, allowing the first tab assembly to emerge from the thinner side of the battery, overcoming the limitation of existing technology that requires it to emerge from the thickest side. The stacked design of the supporting section ensures effective electrical connection between the first and second electrode core units, while the non-supporting section provides independent placement space for the first tab assembly, avoiding physical interference with the second electrode core unit and maintaining a complete electrode connection path.

[0068] By controlling the projection range, spatial partitioning management of the core units is achieved. The support structure ensures the reliable connection between the first and second core units. The non-support structure creates new space for the first tab assembly, ultimately achieving the technical effect of leading out the first tab assembly from the non-maximum thickness side. This structural design maintains the overall energy density of the battery while providing greater freedom in the overall structural design, especially in the expansion of irregularly shaped batteries.

[0069] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0070] refer to Figure 1 , Figure 2 , Figure 3 This application provides a battery that may include a casing 100, a first electrode core unit 200, and a second electrode core unit 300.

[0071] The outer casing 100 has a receiving cavity 110. The receiving cavity 110 of the outer casing 100 refers to a closed space structure for carrying the internal components of the battery. Its internal space can be designed in segments, for example, by forming cavity areas with different depths through a stamping process, or by forming a composite cavity structure integrally by an injection molding process. The shape of the receiving cavity 110 matches the overall outline of the battery and can provide positioning support for the first electrode core unit 200 and the second electrode core unit 300.

[0072] The first electrode core unit 200 may include a first electrode tab assembly 210 and a first body 220, the first body 220 being disposed within the receiving cavity 110. The first body 220 may include components along a first direction (e.g., Figure 1 The first surface 221 and the second surface 222 are opposite to each other in the Y direction, wherein the first direction is the thickness direction of the first body 220.

[0073] The first main body 220 of the first electrode core unit 200 refers to the basic electrochemical reaction unit formed by stacking multiple electrode sheets. The first main body 220 can be a wound electrode assembly or a stacked electrode assembly. In specific implementation, different electrode sheet arrangement methods can be selected according to the battery capacity requirements.

[0074] The second pole core unit 300 is disposed in the receiving cavity 110 and stacked on the first surface 221 of the first body 220 along the first direction. The second pole core unit 300 and the first pole core unit 200 are electrically connected in the receiving cavity 110.

[0075] Along the direction from the second pole core unit 300 to the first pole core unit 200, the projection of the second pole core unit 300 is located within the projection range of the first body 220. The second pole core unit 300 and the first body 220 form a supporting part 230 and a non-supporting part 240, with the second pole core unit 300 located in the supporting part 230. One end of the first pole tab assembly 210 is disposed on the portion of the first body 220 located in the non-supporting part 240, and the other end of the first pole tab assembly 210 passes through the receiving cavity 110 and extends to the outside of the outer shell 100.

[0076] The spatial division between the support portion 230 and the non-support portion 240 is achieved by controlling the support attribute of the first pole core unit 200 on the second pole core unit 300. The support portion 230 can be used to support the second pole core unit 300, and the second pole core unit 300 can cover only a portion of the surface of the support portion 230.

[0077] The first electrode assembly 210 is positioned in the area where the conductive component is installed to conduct current. One end of the first electrode assembly 210 is electrically connected to the first main body 220 of the non-supporting part 240, and the other end extends to the outside of the outer shell 100. In specific implementation, the first electrode assembly 210 can be fixed to the electrode plate of the non-supporting part 240 by welding, or the dual functions of mechanical fixation and electrical connection can be achieved by conductive adhesive.

[0078] The thickness direction of the outer casing 100 refers to the main dimensional extension direction of the overall battery structure. The dimensional differences in this direction are achieved through a segmented cavity design, such as using a stepped thickness distribution when manufacturing the outer casing 100, or forming different thickness areas through a local thickening process.

[0079] The stacking method of the second pole core unit 300 refers to stacking the unit on the surface of the first body 220 along the first direction. This stacking can be achieved by a mechanical positioning structure, such as setting a protruding positioning part on the surface of the first body 220 to cooperate with the groove of the second pole core unit 300, or using an adhesive layer to fix the two together.

[0080] Among them, the electrical connection method refers to the technical implementation of establishing a current conduction path between the two pole core units. Specifically, it can be achieved by directly welding conductive sheets or by using elastic contact components to achieve a detachable electrical connection, such as using a spring pin structure or a conductive rubber pad.

[0081] This technical solution innovatively designs the spatial layout of the supporting portion 230 and the non-supporting portion 240 by constructing a battery structure with a stepped thickness distribution. A bipolar core unit stacked structure is arranged within the receiving cavity 110 of the outer casing 100, where the first main body 220 serves as the basic supporting layer, and the second core unit 300 stacked on its surface is completely contained within the first main body 220 in projection, forming a stepped thickness difference. This stacked design naturally places the second core unit 300 in the thicker area of ​​the battery, while the non-supporting portion 240 of the first main body 220 corresponds to the thinner area.

[0082] Specifically, the placement of the first tab assembly 210 breaks with traditional design constraints, fixing its root to the surface of the first main body 220 of the non-supporting portion 240, with its end extending through the receiving cavity 110 to the outside of the outer casing 100. This arrangement fully utilizes the spatial characteristics of the non-supporting portion 240, allowing the first tab assembly 210 to emerge from the thinner side of the battery, overcoming the limitation of existing technology that it must emerge from the thickest side. The stacked design of the supporting portion 230 ensures effective electrical connection between the first electrode core unit 200 and the second electrode core unit 300, while the non-supporting portion 240 provides independent placement space for the first tab assembly 210, avoiding physical interference with the second electrode core unit 300 and maintaining a complete electrode connection path.

[0083] By controlling the projection range, spatial partitioning management of the core units is achieved. The support part 230 ensures the connection reliability of the first core unit 200 and the second core unit 300. The non-support part 240 creates new space for the first tab assembly 210, ultimately achieving the technical effect of leading out the first tab assembly 210 from the non-maximum thickness side. This structural design maintains the overall energy density of the battery while providing greater freedom in the overall structural design, especially in the expansion of irregular battery shapes.

[0084] refer to Figure 1 , Figure 2 , Figure 3 In some embodiments, the first body 220 may include a plurality of first positive electrode plates 223 and a plurality of first negative electrode plates 224, which are alternately stacked along a first direction. The first tab assembly 210 may include a first positive tab 211 and a first negative tab 212, with the first positive tab 211 electrically connected to each of the first positive electrode plates 223 and the first negative tab 212 electrically connected to each of the first negative electrode plates 224.

[0085] The second electrode core unit 300 may include a second electrode tab assembly 310 and a second body 320. The second body 320 is disposed on the support portion 230. The second electrode tab assembly 310 is electrically connected to the second body 320, and the second electrode tab assembly 310 is electrically connected to at least one first positive electrode 223 and at least one first negative electrode 224 within the support portion 230.

[0086] The alternating stacking of the first positive electrode 223 and the first negative electrode 224 refers to arranging the positive and negative electrodes alternately according to polarity through a stacking process. The purpose is to form a standardized charge transport path and provide a unified interface for the integration of the first tab assembly 210. Specifically, this stacked structure can pre-form the electrode shapes using a die-cutting process and achieve precise alignment using stacking equipment, thereby ensuring the reliability of the electrical connections between the electrodes. The first positive tab 211 and the first negative tab 212 are electrically connected to their corresponding electrodes, aiming to achieve batch connection through unified welding parameters and reduce process complexity. The second tab assembly 310 is electrically connected to the second body 320 and only needs to connect at least one first positive electrode 223 and the first negative electrode 224. This aims to reduce the risk of accumulated assembly errors by reducing the number of connection points, while retaining the high energy density characteristics of the stacked structure.

[0087] The second main body 320 refers to an electrochemical reaction unit composed of multiple positive and negative electrode sheets stacked together. It can be realized by stacking or winding processes. Specifically, it can be die-cut into a specific shape to fit the spatial layout of the support part 230. The second electrode tab assembly 310 refers to a conductive structure that integrates positive and negative electrode current output functions. It can be realized by stamping metal sheets or flexible conductive materials. Specifically, it can be electrically connected to the corresponding electrode sheets by welding or mechanical pressing.

[0088] This scheme constructs the first body 220 by using alternating layers of first positive electrode 223 and first negative electrode 224, which ensures the uniformity of charge transfer and provides a standardized interface for the subsequent integration of the first tab assembly 210. Secondly, by limiting the second tab assembly 310 of the second core unit 300 to only connect with at least one first positive electrode 223 and first negative electrode 224 in the first core unit 200, instead of requiring connection with all corresponding electrodes as in traditional schemes, the complexity of the connection process is significantly reduced.

[0089] Specifically, the alternating arrangement of the first positive electrode 223 and the first negative electrode 224 allows the tab assembly to be batch-connected using uniform welding parameters. The second tab assembly 310, which selectively connects single or a small number of electrodes, reduces the possibility of assembly error accumulation by decreasing the number of connection points. This design not only retains the high energy density advantage of the stacked structure but also improves production yield by simplifying the connection path, while providing a structural basis for the expansion of irregular battery shapes.

[0090] refer to Figure 1 , Figure 2 , Figure 3 In some embodiments, the second body 320 may include a plurality of second positive electrode plates 321 and a plurality of second negative electrode plates 322. The plurality of second positive electrode plates 321 and the plurality of second negative electrode plates 322 are alternately stacked along a first direction.

[0091] The second electrode assembly 310 may include a second positive electrode 311 and a second negative electrode 312. The second positive electrode 311 is electrically connected to each of the second positive electrode plates 321, the second negative electrode 312 is electrically connected to each of the second negative electrode plates 322, the second positive electrode 311 is electrically connected to at least one first positive electrode plate 223, and the second negative electrode 312 is electrically connected to at least one first negative electrode plate 224.

[0092] The electrical connection between the second positive electrode tab 311 and the first positive electrode plate 223 refers to the conductive path formed by physical contact, which can be achieved by ultrasonic welding, laser welding or conductive adhesive bonding. Specifically, locally thickened conductive protrusions are set in the connection area to enhance the contact area.

[0093] This technical solution constructs a complete electrochemical reaction system through the alternating stacked structure of the second positive electrode 321 and the second negative electrode 322 within the second main body 320. Simultaneously, the direct connection between the second tab assembly 310 and all the second positive electrode 321 and second negative electrode 322 ensures uniform current distribution. Specifically, the electrical connection between the second positive tab 311 and each of the second positive electrode 321 allows the current generated by the second main body 320 to converge to the second positive tab 311 through a unified path. Furthermore, the design of this tab being connected to at least one first positive electrode 223 achieves seamless connection between the second main body 320 and the first main body 220 at the potential level.

[0094] This layered, progressive connection method avoids impedance differences caused by the dispersed electrode welding points in traditional stacking processes, and ensures connection reliability through the redundant design of "at least one". The symmetrical design on the negative electrode side maintains the balance of the charge transport path, preventing localized overheating or abnormal potential differences. Notably, this solution does not employ integral welding or complex conductive components, but rather uses direct correspondence between the electrode tabs and the electrode sheets, simplifying the manufacturing process while improving space utilization. This synergizes with the compact structure requirements of irregularly shaped batteries.

[0095] refer to Figure 1 , Figure 2 , Figure 3In some embodiments, the first positive electrode 223 has a first lead-out piece 2231 on the side facing the support portion 230, and the first negative electrode 224 has a second lead-out piece 2241 on the side facing the support portion 230.

[0096] The second positive electrode tab 311 is electrically connected to the first lead 2231 of at least one of the first positive electrode plates 223, and the second negative electrode tab 312 is electrically connected to the second lead 2241 of at least one of the first negative electrode plates 224.

[0097] The first lead-out piece 2231 refers to the conductive structure integrated at the end of the first positive electrode 223. It can be formed simultaneously with the first positive electrode 223 during the fabrication stage using a die-cutting process, ensuring material continuity between the first lead-out piece 2231 and the main body of the first positive electrode 223. The second lead-out piece 2241 refers to the conductive structure integrated at the end of the first negative electrode 224. It can be manufactured integrally with the first negative electrode 224 using a stamping process, avoiding additional processing steps. This design, by directly integrating the lead-out pieces at the electrode ends, reduces the use of independent connectors and optimizes the current path distribution.

[0098] This technical solution integrates the first lead 2231 directly to the end of the first positive electrode 223 and the second lead 2241 to the end of the first negative electrode 224, forming an integrated conductive structure of the first lead 2231 and the first positive electrode 223, and an integrated conductive structure of the second lead 2241 and the first negative electrode 224.

[0099] This design firstly uses a die-cutting process to simultaneously form the first lead-out piece 2231 during the preparation stage of the first positive electrode 223, ensuring material continuity between the first lead-out piece 2231 and the main body of the first positive electrode 223. This avoids the steps of separately processing, positioning, and welding connectors required in traditional solutions, thereby reducing assembly processes and the number of parts.

[0100] Secondly, the first lead-out piece 2231, as an extension of the first positive electrode piece 223, has a geometric shape that matches the main body of the first positive electrode piece 223, which can provide a larger contact area. This provides a more stable connection interface for welding or crimping the second positive electrode tab 311 with the first positive electrode piece 223, reduces contact resistance and improves connection strength.

[0101] Furthermore, the integrated design of the first lead 2231 results in a shorter and more uniform current path, reducing the risk of excessively high local current density and thus improving current conduction efficiency. This structural innovation achieves a synergistic improvement in electrical connection reliability and manufacturing efficiency without increasing additional space requirements. The connection and design between the corresponding second lead 2241 and the first negative electrode 224 can also achieve the same technical effect as the first lead 2231.

[0102] refer to Figure 1 , Figure 2 , Figure 3 In some embodiments, the battery may also include a connection component, one end of which is electrically connected to the second tab assembly 310, and the other end of which is electrically connected to at least one first positive electrode 223 and at least one first negative electrode 224.

[0103] The connecting component refers to an intermediate transition structure with conductive function, which can be implemented using flexible conductive materials (such as copper foil or aluminum foil) or rigid conductive materials (such as copper strips or aluminum strips). The introduction of this component changes the original direct connection mode. Through a layered conductive path design, it retains the space utilization advantage of the built-in tabs while solving the reliability problem in high-current scenarios.

[0104] This solution transforms the direct, rigid connection between the second tab assembly 310 and the first positive electrode 223 and the first negative electrode 224 into a flexible transitional connection via an independent connecting component as an intermediate conductive medium. One end of the connecting component forms a stable connection with the second tab assembly 310, while the other end establishes a current path with at least one of the first positive electrode 223 and the first negative electrode 224. This layered connection structure achieves three levels of technical benefits: First, the connecting component, as an independent conductor, can utilize materials with higher conductivity or a larger cross-sectional area, directly enhancing current carrying capacity. Second, the segmented connection disperses welding stress, avoiding the risk of weld breakage due to thermal expansion differences. Finally, the standardized design of the connecting component reduces spatial constraints between the second tab assembly 310 and the first electrode, allowing for efficient electrical connections within a wider geometric range. This structural innovation is particularly suitable for the complex electrical connection requirements of different stacked regions in irregularly shaped stepped batteries, maintaining the space utilization advantage of the built-in tabs while solving the reliability challenges in high-current scenarios.

[0105] refer to Figure 1 , Figure 2 , Figure 3 In some embodiments, the connecting component (not shown in the figure) may further include a first connector (not shown in the figure) and a second connector (not shown in the figure).

[0106] One end of the first connector is electrically connected to the second positive electrode tab 311, and the other end is electrically connected to at least one first positive electrode plate 223. One end of the second connector is electrically connected to the second negative electrode tab 312, and the other end is electrically connected to at least one first negative electrode plate 224.

[0107] The first connector refers to a conductive structure that independently carries the positive current. It can be implemented using flexible conductive materials such as copper foil, aluminum foil, or multi-strand stranded copper wire. Its purpose is to optimize the conductivity of the positive system through a dedicated path. The second connector refers to a conductive structure that independently carries the negative current. It can be implemented using the same flexible material as the first connector or a flat cable structure. Its purpose is to eliminate the electromagnetic coupling effect between the negative and positive currents through a physically isolated path.

[0108] This solution splits the connection assembly into independent first and second connectors, which respectively handle the current transmission tasks for the positive and negative electrodes. The first connector specifically optimizes the conductive path between the second positive electrode tab 311 and the first positive electrode plate 223, with its two ends connecting to the corresponding electrodes of different tab assemblies. This dedicated design avoids mutual interference between the positive and negative currents in the shared path. The second connector achieves independent connection of the negative electrode system using the same principle, forming complete isolation between the positive and negative conductive paths in physical space.

[0109] This split design not only enhances overall current carrying capacity through independent paths but also reduces the impact of connector deformation on the electrode plates by dispersing mechanical stress. Furthermore, the choice of flexible conductive components further eliminates the risk of puncture that might arise from rigid connections. The synergistic effect of the two connectors optimizes current distribution uniformity, reduces contact resistance at the connection interface, and ultimately improves charging power.

[0110] refer to Figure 1 , Figure 2 , Figure 3 In some embodiments, the first connector is a first flexible conductive element, and the second connector is a second flexible conductive element.

[0111] The first flexible conductive component refers to a conductive structure with bendable deformation capability, which can be realized using materials such as flexible printed circuit boards, conductive polymers, or braided metal wires. Its purpose is to absorb assembly stress through the ductility of the material itself. The second flexible conductive component refers to a conductive element with flexible properties, which can be realized using structures such as corrugated metal foil, elastic conductive adhesive, or composite braided conductors. Its purpose is to adapt to the deformation requirements during battery cycle use.

[0112] This technical solution optimizes and improves the internal electrical connection structure of the battery by using flexible conductive components as the core material for the connection assembly. Specifically, the first flexible conductive component, as the positive electrode connection medium, effectively buffers assembly stress due to its bendable and deformable characteristics, avoiding localized stress concentration that may occur due to rigid contact in traditional metal connectors.

[0113] Similarly, the second flexible conductive element, serving as the negative electrode connection medium, possesses material ductility that can adapt to deformation caused by thermal expansion and contraction during battery cycling, thereby maintaining stable electrical connection performance. This combination design of dual flexible conductive elements ensures the conductivity efficiency of the positive and negative electrode connection channels while eliminating the risk of physical damage that may be caused by rigid connectors through material properties. The foldability of the flexible material also allows for flexible placement of connectors within the complex internal space of the battery, providing greater freedom for the design of irregularly shaped battery structures.

[0114] refer to Figure 1 , Figure 4 , Figure 5 In some embodiments, in the support portion 230, the second body 320 is staggered with the first body 220 along a first direction to form a clearance area 400, and a portion of the second tab assembly 310 is bent within the clearance area 400.

[0115] The staggered arrangement refers to the relative displacement between the second main body 320 and the first main body 220 in the bearing part 230 along the first direction (i.e. the thickness direction). This can be achieved by adjusting the stacking position relationship between the second main body 320 and the first main body 220, for example by adopting a stepped staggered or partially overlapping offset method.

[0116] Among them, the avoidance zone 400 refers to the local spatial area formed by the staggered arrangement. It can be a wedge-shaped, rectangular or irregularly shaped gap area, which can be defined by controlling the amount of stagger and the stacking height.

[0117] The bent portion refers to the area in the second tab assembly 310 with a bent structure, which can be a right-angle bend, an arc bend, or a multiple bend, achieved through stamping or laser cutting of metal foil. The purpose of introducing the above technical features is to provide a space for the bent portion of the second tab assembly 310 by forming an avoidance area 400 through staggered arrangement, thereby avoiding the additional space occupied by the connection structure inside the battery.

[0118] This technical solution forms a clearance area 400 by staggering the second main body 320 and the first main body 220 along the first direction in the support portion 230, allowing the bent portion of the second tab assembly 310 to be embedded in this clearance area 400. This design solves the redundancy problem caused by the space occupied by the connection structure when two electrode core units are stacked: First, the staggered arrangement naturally forms a clearance area 400 between the second main body 320 and the first main body 220 by adjusting their relative positions, providing space for the tab assembly without the need for additional structural components. Second, positioning the bent portion of the second tab assembly 310 within the clearance area 400 makes the connection structure and the stacking direction of the electrode core units spatially complementary, avoiding the problem of the tab assembly needing to occupy additional external space in traditional stacked structures. This space utilization method ensures a stable electrical connection between the second tab assembly 310 and the first electrode core unit 200, while avoiding volume expansion caused by the connection structure, thereby improving the utilization rate of the battery's internal space while maintaining high energy density. By embedding the connection structure within the misalignment gap of the electrode core unit, the mechanical stress interference of the battery casing 100 on the connection area is also reduced, thus improving structural reliability.

[0119] refer to Figure 6 In some embodiments, the housing 100 may include a first receiving portion 120 and a second receiving portion 130.

[0120] The first receiving portion 120 is used to receive the second pole core unit 300 and the portion of the first body 220 that overlaps with the second pole core unit 300. Along the first direction, the thickness of the second receiving portion 130 is less than the size of the first receiving portion 120, and the second receiving portion 130 is used to receive the portion of the first body 220 that does not overlap with the second pole core unit 300.

[0121] The first receiving portion 120 refers to the structural part of the outer shell 100 used to accommodate the relatively thick area formed by the superposition of the first main body 220 and the second pole core unit 300. It can be implemented using a metal shell or a composite material laminate structure, and its purpose is to provide support and protection that matches the physical characteristics of the supporting portion 230. The second receiving portion 130 refers to the structural part of the outer shell 100 corresponding to the single-layer thickness characteristics of the non-supporting portion 240. It can be implemented using an injection-molded plastic frame or a thin-walled metal structure, and its purpose is to adapt to the space requirements of the non-supporting portion 240 by reducing its thickness, thereby avoiding the generation of redundant space.

[0122] This solution optimizes the adaptability of the housing 100 structure by setting receptacles with varying thicknesses. Specifically, the first receptacle 120 is designed to accommodate the thickness requirements of the supporting portion 230, and its size is sufficient to fully accommodate the larger thickness area formed by the stacking of the first main body 220 and the second electrode core unit 300. The second receptacle 130 corresponds to the single-layer thickness characteristics of the non-supporting portion 240, and its smaller thickness parameter matches the actual space requirements of the non-supporting portion 240. This regional thickness design allows the housing 100 to closely fit the physical characteristics of different areas inside the battery, avoiding the gaps generated in thinner areas by a traditional uniform thickness housing 100, thereby effectively reducing the overall volume while ensuring the integrity of the battery structure. By setting the thickness parameter of the second receptacle 130 to be smaller than that of the first receptacle 120, not only is precise utilization of the housing 100 material achieved, but more usable space is also freed up for the layout of other components inside the electronic device, ultimately achieving the technical goal of improving space utilization.

[0123] refer to Figure 1 This application also provides an electronic device, which may include a device body and the battery described above.

[0124] In some embodiments, the electronic device may be an electronic device with foldable functionality, which may include, but is not limited to, foldable mobile phones, foldable tablets, foldable laptops, foldable netbooks, foldable wearable devices, and other mobile or fixed terminals.

[0125] This technical solution improves the overall space utilization of electronic devices by integrating an improved battery structure. Specifically, the design of the device body and the battery allows the stepped structure of the battery (i.e., a step difference in the thickness direction) to be nested in a way that is compatible with the internal space of the electronic device (such as the stepped shape of the battery compartment or the motherboard recess area). The first tab assembly 210 is located in the non-load-bearing part 230 of the first electrode core unit 200 and the second electrode core unit 300, allowing the first tab assembly 210 to be led out from the thinner side of the battery. This overcomes the limitation of traditional irregularly shaped batteries, which must lead out the tab from the thickest side, thereby avoiding the problem of electrode electrical connection failure caused by the limited tab lead-out position.

[0126] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0127] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0128] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0129] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized by, include: The outer casing (100) has a receiving cavity (110); The first pole core unit (200) includes a first pole ear assembly (210) and a first body (220), wherein the first body (220) is disposed within the receiving cavity (110); The first body (220) includes a first surface (221) and a second surface (222) opposite each other along a first direction, wherein the first direction is the thickness direction of the first body (220); The second pole core unit (300) is disposed in the receiving cavity (110) and stacked on the first surface (221) of the first body (220) along the first direction. The second pole core unit (300) and the first pole core unit (200) are electrically connected in the receiving cavity (110). Along the direction from the second pole core unit (300) to the first pole core unit (200), the projection of the second pole core unit (300) is located within the projection range of the first body (220). The second pole core unit (300) and the first body (220) form a supporting part (230) and a non-supporting part (240), with the second pole core unit (300) located in the supporting part (230). One end of the first pole tab assembly (210) is disposed on the portion of the first body (220) located in the non-supporting part (240), and the other end of the first pole tab assembly (210) passes through the receiving cavity (110) and extends to the outside of the outer shell (100).

2. The battery of claim 1, wherein, The first body (220) includes a plurality of first positive electrode plates (223) and a plurality of first negative electrode plates (224), wherein the first positive electrode plates (223) and the first negative electrode plates (224) are alternately stacked along the first direction; The first electrode assembly (210) includes a first positive electrode (211) and a first negative electrode (212). The first positive electrode (211) is electrically connected to each of the first positive electrode plates (223), and the first negative electrode (212) is electrically connected to each of the first negative electrode plates (224). The second electrode core unit (300) includes a second electrode tab assembly (310) and a second body (320). The second body (320) is disposed on the support portion (230). The second electrode tab assembly (310) is electrically connected to the second body (320), and the second electrode tab assembly (310) is electrically connected to at least one first positive electrode plate (223) and at least one first negative electrode plate (224) within the support portion (230).

3. The battery of claim 2, wherein, The second body (320) includes: Multiple second positive electrode plates (321) and multiple second negative electrode plates (322) are arranged alternately in the first direction; The second electrode assembly (310) includes a second positive electrode (311) and a second negative electrode (312). The second positive electrode (311) is electrically connected to each of the second positive electrode plates (321), and the second negative electrode (312) is electrically connected to each of the second negative electrode plates (322). The second positive electrode tab (311) is electrically connected to at least one of the first positive electrode plates (223), and the second negative electrode tab (312) is electrically connected to at least one of the first negative electrode plates (224).

4. The battery of claim 3, wherein, The first positive electrode (223) has a first lead-out piece (2231) on the side facing the support portion (230), and the first negative electrode (224) has a second lead-out piece (2241) on the side facing the support portion (230); The second positive electrode tab (311) is electrically connected to the first lead (2231) of at least one of the first positive electrode plates (223), and the second negative electrode tab (312) is electrically connected to the second lead (2241) of at least one of the first negative electrode plates (224).

5. The battery of claim 3, wherein, It also includes connection components; One end of the connection component is electrically connected to the second electrode assembly (310), and the other end is electrically connected to at least one first positive electrode (223) and at least one first negative electrode (224).

6. The battery of claim 5, wherein, The connection component also includes: The first connector has one end electrically connected to the second positive electrode tab (311) and the other end electrically connected to at least one of the first positive electrode plates (223); The second connector has one end electrically connected to the second negative electrode tab (312) and the other end electrically connected to at least one of the first negative electrode plates (224).

7. The battery of claim 6, wherein, The first connector is a first flexible conductive element; The second connector is a second flexible conductive element.

8. The battery of claim 2, wherein, In the bearing portion (230), the second body (320) is offset from the first body (220) along the first direction and forms a clearance area (400), and a portion of the second tab assembly (310) is bent within the clearance area (400).

9. The battery of claim 1, wherein, The housing (100) includes: The first receiving portion (120) is used to receive the second pole core unit (300) and the portion of the first body (220) that overlaps with the second pole core unit (300); The second receiving portion (130) is located along the first direction and its thickness is less than that of the first receiving portion (120). The second receiving portion (130) is used to receive the portion of the first body (220) that does not overlap with the second pole core unit (300).

10. An electronic device, comprising: It includes the main body of the device and the battery as described in any one of claims 1 to 9.

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