Winding core structure, battery pack and intelligent terminal
By placing the tabs in an independent cavity in the lithium-ion battery core structure, the problem of increased core thickness due to tab winding is solved, thereby improving energy density and optimizing current density, and enhancing battery performance and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN TECNO TECH CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-07-03
AI Technical Summary
In existing lithium-ion battery core structures, the tabs and electrode sheets are wound together, which increases the core thickness and reduces energy density.
Design a core structure in which the positive and negative electrode tabs are respectively set in independent cavities, utilizing the cavity space to accommodate the electrode tabs and avoiding increasing the thickness during winding.
The energy density of the core structure is improved. By making reasonable use of the internal space, the impact of the tabs on the core thickness is reduced, the current density distribution is optimized, and the battery performance and safety are improved.
Smart Images
Figure CN224458161U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery structure technology, specifically to a core structure, a battery pack, and a smart terminal. Background Technology
[0002] A lithium-ion battery is a type of rechargeable battery that primarily functions by the movement of lithium ions between the positive and negative electrodes. The core of a lithium-ion battery typically includes a separator and two electrodes, with the separator stacked between the two electrodes. The separator and the two electrodes are wound together to form the battery's core structure.
[0003] In conceiving and implementing this application, the inventors discovered at least the following problems: In some designs, the electrode includes a current collector and an active material layer, with the active material layer coated on both sides of the current collector. The current collector collects electrons generated by the chemical reaction and conducts these electrons to the external circuit through tabs welded to it. However, the tabs need to be wound together with the electrode to form a core structure, resulting in increased core structure thickness and a loss of energy density.
[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content
[0005] To address the aforementioned technical issues, this application provides a core structure, a battery pack, and a smart terminal, which can reduce the impact of the tabs on the thickness of the core structure and improve the energy density of the core structure.
[0006] To address the aforementioned technical problems, this application provides a core structure, comprising:
[0007] A positive electrode sheet, wherein the positive electrode sheet comprises a first positive electrode portion, a first bent portion, and a second positive electrode portion arranged sequentially;
[0008] A negative electrode sheet, wherein the negative electrode sheet comprises a first negative electrode portion, a second bent portion, and a second negative electrode portion arranged sequentially;
[0009] The first positive electrode portion, the first bent portion, the second positive electrode portion, and the first negative electrode portion form a first cavity; the first negative electrode portion, the second bent portion, the second negative electrode portion, and the first positive electrode portion form a second cavity;
[0010] A positive electrode tab is disposed on the first positive electrode portion or the second positive electrode portion, and the positive electrode tab is disposed corresponding to the first cavity;
[0011] The negative electrode tab is disposed on the first negative electrode portion or the second negative electrode portion, and the negative electrode tab is disposed corresponding to the second cavity.
[0012] Optionally, the first positive electrode portion (101), the first bent portion (102), and the second positive electrode portion (103) are arranged sequentially from the inside to the outside.
[0013] Optionally, the first negative electrode portion (201), the second bent portion (202), and the second negative electrode portion (203) are arranged sequentially from the inside to the outside.
[0014] Optionally, in the core structure provided in this application, the positive electrode sheet includes a first conductive current collector, and the positive electrode tab is disposed on the side of the first conductive current collector facing the first cavity.
[0015] Optionally, the negative electrode includes a second conductive current collector, and the negative electrode tab is disposed on the side of the second conductive current collector facing the second cavity.
[0016] Optionally, in the core structure provided in this application, the positive electrode sheet further includes at least two positive electrode protective layers, and the two positive electrode protective layers are respectively disposed on opposite sides of the positive electrode tab.
[0017] Optionally, the negative electrode sheet further includes at least two negative electrode protective layers, which are respectively disposed on opposite sides of the negative electrode tab.
[0018] Optionally, in the core structure provided in this application, the positive electrode sheet includes a first positive electrode active layer and a second positive electrode active layer, wherein the first positive electrode active layer is located inside the first conductive current collector, and the second positive electrode active layer is located outside the first conductive current collector.
[0019] Optionally, the negative electrode includes a first negative electrode active layer and a second negative electrode active layer, wherein the first negative electrode active layer is located inside the second conductive current collector and the second negative electrode active layer is located outside the second conductive current collector.
[0020] Optionally, in the core structure provided in this application, the first positive electrode active layer is provided with a first mounting groove, and the positive electrode tab is disposed in the first mounting groove.
[0021] Optionally, the first negative electrode active layer is provided with a second mounting groove, and the negative electrode tab is disposed in the second mounting groove.
[0022] Optionally, in the core structure provided by this application, the length of the first cavity is greater than the length of the positive electrode tab in the length direction of the first negative electrode portion, and the positive electrode tab is located between the first bent portion and the first negative electrode portion.
[0023] Optionally, in the length direction of the first positive electrode portion, the length of the second cavity is greater than the length of the negative electrode tab, and the negative electrode tab is located between the second bent portion and the first positive electrode portion.
[0024] Optionally, in the core structure provided in this application, the first positive electrode active layer and the second positive electrode active layer are flush with one end of the first positive electrode portion facing the second bending portion.
[0025] Optionally, in the first negative electrode portion, the first negative electrode active layer and the second negative electrode active layer are flush with one end facing the first bending portion.
[0026] Optionally, in the core structure provided in this application, the positive electrode tab is disposed on the first positive electrode portion, and the negative electrode tab is disposed on the first negative electrode portion.
[0027] Optionally, the positive electrode tab is disposed on the second positive electrode portion, and the negative electrode tab is disposed on the second negative electrode portion.
[0028] Optionally, in the core structure provided in this application, a diaphragm is provided between the positive electrode sheet and the negative electrode sheet, and a first part of the diaphragm covers the surface of the positive electrode tab facing the first cavity;
[0029] The second part of the diaphragm covers the surface of the negative electrode tab facing the second cavity.
[0030] This application provides a battery pack, which includes the above-described core structure.
[0031] Optionally, the battery pack further includes a housing, and the winding structure is disposed inside the housing.
[0032] This application provides a smart terminal, which may include the battery pack or core structure described in the above technical solution.
[0033] As described above, the core structure of this application includes a positive electrode sheet, a negative electrode sheet, a positive electrode tab, and a negative electrode tab. The positive electrode sheet includes a first positive electrode portion, a first bent portion, and a second positive electrode portion arranged sequentially from the inside out. The negative electrode sheet includes a first negative electrode portion, a second bent portion, and a second negative electrode portion arranged sequentially from the inside out. The first positive electrode portion, the first bent portion, the second positive electrode portion, and the first negative electrode portion form a first cavity; the first negative electrode portion, the second bent portion, the second negative electrode portion, and the first positive electrode portion form a second cavity. The positive electrode tab is disposed on the first positive electrode portion or the second positive electrode portion, and the positive electrode tab is correspondingly disposed on the first negative electrode portion or the second negative electrode portion, and the negative electrode tab is correspondingly disposed on the second cavity. By aligning the positive electrode tab with the first cavity and the negative electrode tab with the second cavity, and considering the thickness of the positive electrode tab, it can protrude into the first cavity, while the negative electrode tab can protrude into the second cavity. In contrast to the prior art where the tabs need to be wound together with the electrode sheet to form a core structure, in this embodiment, the positive and negative electrode tabs occupy the spaces of the first and second cavities respectively, thus not affecting the thickness of the core structure. This allows for more efficient use of the internal space of the core structure, which is beneficial for improving its energy density. Attached Figure Description
[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.
[0035] Figure 1 This is a schematic diagram of the internal cross-sectional structure of the core structure provided in the embodiments of this application;
[0036] Figure 2 Provided for the embodiments of this application Figure 1 A magnified structural diagram of part A in the middle;
[0037] Figure 3 Provided for the embodiments of this application Figure 1 A magnified structural diagram of part B in the middle section;
[0038] Figure 4 This is a schematic diagram of the hardware structure of a mobile terminal provided in an embodiment of this application.
[0039] Figure label:
[0040] 10. Positive electrode protective layer; 20. Negative electrode protective layer; 100. Positive electrode sheet; 101. First positive electrode portion; 102. First bending portion; 103. Second positive electrode portion; 110. First conductive current collector; 120. First positive electrode active layer; 130. Second positive electrode active layer; 200. Negative electrode sheet; 201. First negative electrode portion; 202. Second bending portion; 203. Second negative electrode portion; 210. Second conductive current collector; 220. First negative electrode active layer; 230. Second negative electrode active layer; 300. Positive electrode tab; 400. Negative electrode tab; 500. First cavity; 600. Second cavity; 700. Separator.
[0041] The objectives, functional features, and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation
[0042] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0043] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Optionally, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which needs to be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.
[0044] It should be understood that in the description of this application, terms such as "inner" and "outer" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.
[0045] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "connected" and "linked" 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; and they can refer to the internal connection 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.
[0046] 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 technical features indicated. 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, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," 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 disclosure. 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.
[0048] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.
[0049] To facilitate understanding, the application scenarios applicable to the embodiments of this application will be described below.
[0050] With the advent of the 5G era and the rapid development of lithium-ion battery technology, people have placed higher demands on the energy density, fast charging capability, and charge / discharge rate of lithium-ion batteries. Fast-charging lithium-ion batteries have become the trend in the development of consumer lithium-ion batteries. A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. The core of a lithium-ion battery typically includes a separator and two electrodes. The separator is stacked between the two electrodes, and the separator and the two electrodes are wound together to form the battery's core structure.
[0051] In some designs, the electrode comprises a current collector and an active material layer, with the active material layer coated on both sides of the current collector. The current collector collects electrons generated by the chemical reaction and conducts these electrons to the external circuit via tabs welded to it. To optimize the current density distribution within the electrode, tabs are typically positioned at 3 / 4, 1 / 3, or 1 / 2 of the electrode's winding direction. This reduces the internal resistance of the core structure, decreases polarization, optimizes the current density distribution on the electrode during charging and discharging, and improves the battery's fast-charging capability. However, the tabs need to be wound together with the electrode to form a core structure, leading to an increase in the core structure's thickness and a loss of energy density.
[0052] This application provides a wound core structure, a battery pack, and a smart terminal. The wound core structure includes a positive electrode sheet 100, a negative electrode sheet 200, a positive electrode tab 300, and a negative electrode tab 400. The positive electrode sheet 100 includes a first positive electrode portion 101, a first bent portion 102, and a second positive electrode portion 103 arranged sequentially from the inside out. The negative electrode sheet 200 includes a first negative electrode portion 201, a second bent portion 202, and a second negative electrode portion 203 arranged sequentially from the inside out. The first positive electrode portion 101, the first bent portion 102, the second positive electrode portion 103, and the first negative electrode portion 201 form a first cavity 500. The first negative electrode portion 201, the second bent portion 202, the second negative electrode portion 203, and the first positive electrode portion 101 form a second cavity 600. A positive electrode tab 300 is disposed on the first positive electrode portion 101 or the second positive electrode portion 103, and the positive electrode tab 300 is disposed corresponding to the first cavity 500. A negative electrode tab 400 is disposed on the first negative electrode portion 201 or the second negative electrode portion 203, and the negative electrode tab 400 is disposed corresponding to the second cavity 600.
[0053] In this embodiment, the positive electrode tab 300 corresponds to the first cavity 500, and the negative electrode tab 400 corresponds to the second cavity 600. Since the positive electrode tab 300 has a certain thickness, it can protrude into the first cavity 500, and the negative electrode tab 400 can protrude into the second cavity 600. Thus, compared to some solutions where the tabs need to be wound together with the electrode sheet to form a core structure, in this embodiment, the positive electrode tab 300 and the negative electrode tab 400 occupy the space of the first cavity 500 and the second cavity 600 respectively, therefore not affecting the thickness of the core structure.
[0054] In this embodiment, the positive electrode tab 300 is accommodated or partially accommodated in the first cavity 500, and the negative electrode tab 400 is accommodated or partially accommodated in the second cavity 600, so that the internal space of the core structure is utilized more rationally, which is conducive to improving the energy density of the core structure.
[0055] Based on the above-described core structure, battery pack, and smart terminal structure, various embodiments of this application are proposed.
[0056] First Embodiment
[0057] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides a core structure, which includes a positive electrode sheet 100, a negative electrode sheet 200, a positive electrode tab 300, and a negative electrode tab 400.
[0058] Optionally, the positive electrode 100 includes a first positive electrode portion 101, a first bent portion 102, and a second positive electrode portion 103 arranged sequentially from the inside out, and the negative electrode 200 includes a first negative electrode portion 201, a second bent portion 202, and a second negative electrode portion 203 arranged sequentially from the inside out. Here, the first positive electrode portion 101, the first bent portion 102, and the second positive electrode portion 103 are connected sequentially from the inside out. The connection method of the first positive electrode portion 101, the first bent portion 102, and the second positive electrode portion 103 is not limited in this embodiment, and the first positive electrode portion 101, the first bent portion 102, and the second positive electrode portion 103 can also be a single piece.
[0059] Optionally, the first negative electrode portion 201, the second bent portion 202, and the second negative electrode portion 203 are connected sequentially from the inside to the outside. In this embodiment, the connection method of the first negative electrode portion 201, the second bent portion 202, and the second negative electrode portion 203 is not limited. The first negative electrode portion 201, the second bent portion 202, and the second negative electrode portion 203 can also be an integral part.
[0060] Optionally, the first positive electrode portion 101, the first bent portion 102, the second positive electrode portion 103, and the first negative electrode portion 201 form a first cavity 500; the first negative electrode portion 201, the second bent portion 202, the second negative electrode portion 203, and the first positive electrode portion 101 form a second cavity 600. A positive electrode tab 300 is disposed on the first positive electrode portion 101 or the second positive electrode portion 103, and the positive electrode tab 300 corresponds to the first cavity 500. A negative electrode tab 400 is disposed on the first negative electrode portion 201 or the second negative electrode portion 203, and the negative electrode tab 400 corresponds to the second cavity 600.
[0061] In this embodiment, the positive electrode tab 300 corresponds to the first cavity 500, and the negative electrode tab 400 corresponds to the second cavity 600. Since the positive electrode tab 300 has a certain thickness, it can protrude into the first cavity 500, and the negative electrode tab 400 can protrude into the second cavity 600. Thus, compared to some solutions where the tabs need to be wound together with the electrode sheet to form a core structure, in this embodiment, the positive electrode tab 300 and the negative electrode tab 400 occupy the space of the first cavity 500 and the second cavity 600 respectively, thus not affecting the thickness of the core structure. This allows for more rational use of the internal space of the core structure, which is beneficial for improving the energy density of the core structure.
[0062] In this embodiment, the positive electrode tab 300 is accommodated or partially accommodated in the first cavity 500, and the negative electrode tab 400 is accommodated or partially accommodated in the second cavity 600. This can at least reduce the impact of the thickness of the positive electrode tab 300 and the negative electrode tab 400 on the overall thickness of the core structure, so that the internal space of the core structure can be utilized more rationally, which is conducive to improving the energy density of the core structure.
[0063] Optionally, the second positive electrode portion 103 and the second negative electrode portion 203 can also be wound multiple times from the inside out. This application embodiment does not limit the number of turns of the second positive electrode portion 103 and the second negative electrode portion 203 from the inside out.
[0064] In some implementations, the positive electrode 100 includes a first conductive current collector 110, and a positive electrode tab 300 is disposed on the side of the first conductive current collector 110 facing the first cavity 500. Optionally, the negative electrode 200 includes a second conductive current collector 210, and a negative electrode tab 400 is disposed on the side of the second conductive current collector 210 facing the second cavity 600.
[0065] The positive electrode tab 300 is disposed on the side of the first conductive current collector 110 facing the first cavity 500, and the negative electrode tab 400 is disposed on the side of the second conductive current collector 210 facing the second cavity 600. This allows the tabs to utilize the space of the first cavity 500 and the second cavity 600 in the core structure. The first cavity 500 and the second cavity 600 can be considered as "reserved spaces" in the core structure. By disposing the positive electrode tab 300 and the negative electrode tab 400 on the sides facing the first cavity 500 and the second cavity 600 respectively, it prevents part of the positive electrode 100 at the connection position with the positive electrode tab 300 from protruding into the first space, and prevents part of the negative electrode 200 at the connection position with the negative electrode tab 400 from protruding into the second space, thus avoiding interference and stress concentration.
[0066] Optionally, refer to Figure 2 and Figure 3 As shown, the positive electrode 100 also includes at least two positive electrode protection layers 10, which are respectively disposed on opposite sides of the positive electrode tab 300.
[0067] Optionally, refer to Figure 2 and Figure 3 As shown, the negative electrode plate 200 also includes at least two negative electrode protection layers 20, which are respectively disposed on opposite sides of the negative electrode tab 400.
[0068] Optionally, the positive electrode protective layer 10 and the negative electrode protective layer 20 can be protective adhesives. The positive electrode protective layer 10 protects the structure of the positive electrode tab 300, preventing it from shifting or detaching, and also provides insulation protection. The negative electrode protective layer 20 protects the structure of the negative electrode tab 400, preventing it from shifting or detaching, and also provides insulation protection. This improves the stability and safety of the positive electrode tab 300 and the negative electrode tab 400.
[0069] Optionally, at least two positive electrode protective layers 10 can be provided on the side of the positive electrode tab 300 facing away from the first cavity 500, and at least two negative electrode protective layers 20 can be provided on the side of the negative electrode tab 400 facing away from the second cavity 600, so as to further improve the protection effect on the positive electrode tab 300 and the negative electrode tab 400. This application does not impose any limitations on this.
[0070] Optionally, the positive electrode 100 includes a first positive electrode active layer 120 and a second positive electrode active layer 130, wherein the first positive electrode active layer 120 is located inside the first conductive current collector 110 and the second positive electrode active layer 130 is located outside the first conductive current collector 110.
[0071] Optionally, the negative electrode 200 includes a first negative electrode active layer 220 and a second negative electrode active layer 230, with the first negative electrode active layer 220 located inside the second conductive current collector 210 and the second negative electrode active layer 230 located outside the second conductive current collector 210.
[0072] In this embodiment, the positive electrode 100 and negative electrode 200 are each designed to contain inner and outer active layers, distributed on both sides of the current collector, allowing for more active material to be accommodated per unit volume. When winding to form a core structure, the amount of active material can be increased within a limited space, improving space utilization and thus contributing to increased battery energy density. The multi-layer active layer structure helps achieve a more uniform current distribution on the electrodes. During charging and discharging, the current will not be excessively concentrated in localized areas, avoiding problems such as electrode overheating and exacerbated side reactions caused by excessive local current, thus improving the overall performance and safety of the battery, and also facilitating stable electron conduction.
[0073] Optionally, the first positive electrode active layer 120 is provided with a first mounting groove (not shown in the figure), and the positive electrode tab 300 passes through the first mounting groove.
[0074] Optionally, the first negative electrode active layer 220 is provided with a second mounting groove (not shown in the figure), and the negative electrode tab 400 passes through the second mounting groove.
[0075] This embodiment of the application provides a precise position for the installation of the positive electrode tab 300 by providing a first mounting groove in the first positive electrode active layer 120. This ensures that the positive electrode tab 300 is in a predetermined position during winding, preventing displacement or twisting, thereby improving the consistency and stability of the core structure. Similarly, by providing a second mounting groove in the first negative electrode active layer 220, a precise position is provided for the installation of the negative electrode tab 400. This ensures that the negative electrode tab 400 is in a predetermined position during winding, preventing displacement or twisting, thereby improving the consistency and stability of the core structure.
[0076] By providing a first mounting groove and a second mounting groove, this embodiment of the application can further reduce the impact of the positive electrode tab 300 and the negative electrode tab 400 on the thickness of the core structure in the thickness direction, which helps to make the core structure thinner and lighter.
[0077] Second Embodiment
[0078] like Figure 1 , Figure 2 and Figure 3 As shown, this application provides a core structure, which includes a positive electrode sheet 100, a negative electrode sheet 200, a positive electrode tab 300, and a negative electrode tab 400. The positive electrode sheet 100 includes a first positive electrode portion 101, a first bent portion 102, and a second positive electrode portion 103 arranged sequentially from the inside out. The negative electrode sheet 200 includes a first negative electrode portion 201, a second bent portion 202, and a second negative electrode portion 203 arranged sequentially from the inside out.
[0079] The first positive electrode portion 101, the first bent portion 102, the second positive electrode portion 103, and the first negative electrode portion 201 form a first cavity 500; the first negative electrode portion 201, the second bent portion 202, the second negative electrode portion 203, and the first positive electrode portion 101 form a second cavity 600.
[0080] A positive electrode tab 300 is disposed on the first positive electrode portion 101 or the second positive electrode portion 103, and the positive electrode tab 300 is disposed corresponding to the first cavity 500. A negative electrode tab 400 is disposed on the first negative electrode portion 201 or the second negative electrode portion 203, and the negative electrode tab 400 is disposed corresponding to the second cavity 600.
[0081] Optionally, in the length direction of the first negative electrode portion 201, the length of the first cavity 500 is greater than the length of the positive electrode tab 300, and the positive electrode tab 300 is located between the first bending portion 102 and the first negative electrode portion 201.
[0082] Optionally, in the length direction of the first positive electrode portion 101, the length of the second cavity 600 is greater than the length of the negative electrode tab 400, and the negative electrode tab 400 is located between the second bend portion 202 and the first positive electrode portion 101.
[0083] In this embodiment, by setting the length of the first cavity 500 to be greater than the length of the positive electrode tab 300, the first cavity 500 can completely accommodate a portion of the thickness of the positive electrode tab 300 protruding towards the first cavity 500, thus preventing the thickness of the positive electrode tab 300 itself from interfering with other parts during the winding process. Similarly, by setting the length of the second cavity 600 to be greater than the length of the negative electrode tab 400, the second cavity 600 can completely accommodate a portion of the thickness of the negative electrode tab 400 protruding towards the second cavity 600, thus preventing the thickness of the negative electrode tab 400 itself from interfering with other parts during the winding process.
[0084] Optionally, in the first positive electrode portion 101, the first positive electrode active layer 120 and the second positive electrode active layer 130 are flush with one end of the second bent portion 202.
[0085] Optionally, in the first negative electrode portion 201, the first negative electrode active layer 220 and the second negative electrode active layer 230 are flush with one end of the first bent portion 102.
[0086] In some solutions, the use of a winding method may result in a single-sided area inside the core structure. The current collector at the single-sided area is prone to bending due to the inconsistent stress on both sides, which increases the difficulty of processing and manufacturing. Furthermore, the bending location may increase the lithium-ion transmission distance, resulting in lithium plating and affecting the safety and service life of the core structure.
[0087] By adopting the above-described configuration, the problem of inconsistent stress between the first conductive current collector 110 and the second conductive current collector 210 can be avoided. This also prevents bending of the first conductive current collector 110 and the second conductive current collector 210, and reduces the amount of protective material used. To a certain extent, this improves the volumetric energy density of the core structure while reducing costs.
[0088] Optionally, the positive electrode tab 300 is disposed on the first positive electrode portion 101, and the negative electrode tab 400 is disposed on the first negative electrode portion 201.
[0089] Optionally, the positive electrode tab 300 is disposed on the second positive electrode portion 103, and the negative electrode tab 400 is disposed on the second negative electrode portion 203.
[0090] By using the above configuration, the positive electrode tab 300 and the negative electrode tab 400 can be symmetrically arranged, which helps to improve the stress concentration problem inside the core and improves the safety of the core structure to a certain extent.
[0091] Optionally, a diaphragm 700 is provided between the positive electrode 100 and the negative electrode 200, and a first part of the diaphragm 700 covers the surface of the positive electrode tab 300 facing the first cavity 500.
[0092] Optionally, a second portion of the diaphragm 700 covers the surface of the negative electrode tab 400 facing the second cavity 600.
[0093] In this embodiment, the diaphragm 700 facilitates lithium-ion transport and provides stability to the positive electrode tab 300 and negative electrode tab 400, preventing them from shifting or falling off.
[0094] Third Embodiment
[0095] This application provides a battery pack including the winding core structure described in the above embodiments. Optionally, the battery pack of this application also includes a housing, with the winding core structure disposed inside the housing.
[0096] Optionally, the specific structure of the core structure in the embodiments of this application has been described in the above embodiments and will not be repeated here. The battery pack of the embodiments of this application has the technical effects of the above-mentioned core structure, which can improve the energy density of the battery pack and help to achieve the thinning of the battery pack.
[0097] Fourth embodiment
[0098] This application provides a smart terminal, which may include the battery pack or winding structure in the above embodiments.
[0099] By incorporating the aforementioned battery pack or core structure, smart terminals can be made thinner and lighter, and their power reserves can be increased.
[0100] Optionally, the smart terminal can be implemented in various forms. For example, the smart terminal described in this application may include mobile terminals such as mobile phones, tablets, laptops, handheld computers, personal digital assistants (PDAs), portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc., as well as fixed terminals such as digital TVs and desktop computers.
[0101] The following description will use a mobile terminal as an example. Those skilled in the art will understand that, in addition to components specifically designed for mobile purposes, the construction according to the embodiments of this application can also be applied to fixed-type terminals.
[0102] Please see Figure 4This is a schematic diagram of the hardware structure of a mobile terminal implementing various embodiments of this application. The mobile terminal 1000 may include: an RF (Radio Frequency) unit 1010, a WiFi module 1020, an audio output unit 1030, an A / V (Audio / Video) input unit 1040, a sensor 1050, a display unit 1060, a user input unit 1070, an interface unit 1080, a memory 1090, a processor 1100, and a power supply 1110, etc. Those skilled in the art will understand that... Figure 4 The mobile terminal structure shown does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements.
[0103] The following is combined Figure 4 A detailed introduction to each component of the mobile terminal:
[0104] The radio frequency (RF) unit 1010 can be used for receiving and transmitting signals during information transmission or calls. Specifically, it receives downlink information from the base station and processes it with the processor 1100; additionally, it transmits uplink data to the base station. Typically, the RF unit 1010 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, and a duplexer. Furthermore, the RF unit 1010 can also communicate wirelessly with networks and other devices. The aforementioned wireless communications may use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution), TDD-LTE (Time Division Duplexing-Long Term Evolution), 5G, and 6G.
[0105] WiFi is a short-range wireless transmission technology. Mobile terminals using the WiFi module 1020 can help users send and receive emails, browse web pages, and access streaming media, providing users with wireless broadband internet access. Although Figure 4 The WiFi module 1020 is shown, but it is understood that it is not a necessary component of the mobile terminal and can be omitted as needed without changing the nature of this application.
[0106] The audio output unit 1030 can convert audio data received by the radio frequency unit 1010 or the WiFi module 1020 or stored in the memory 1090 into audio signals and output them as sound when the mobile terminal 1000 is in call signal receiving mode, call mode, recording mode, voice recognition mode, broadcast receiving mode, etc. Furthermore, the audio output unit 1030 can also provide audio output related to specific functions performed by the mobile terminal 1000 (e.g., call signal receiving sound, message receiving sound, etc.). The audio output unit 1030 may include a speaker, a buzzer, etc.
[0107] The A / V input unit 1040 is used to receive audio or video signals. The A / V input unit 1040 may include a graphics processing unit (GPU) 1041 and a microphone 1042. The GPU 1041 processes image data of still images or videos acquired by an image capture device (such as a camera) in video capture mode or image capture mode. The processed image frames can be displayed on the display unit 1060. The image frames processed by the GPU 1041 can be stored in the memory 1090 (or other storage medium) or transmitted via the radio frequency unit 1010 or the WiFi module 1020. The microphone 1042 can receive sound (audio data) in operating modes such as telephone call mode, recording mode, and voice recognition mode, and can process such sound into audio data. The processed audio (voice) data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 1010 in telephone call mode. Microphone 1042 can implement various types of noise cancellation (or suppression) algorithms to eliminate (or suppress) noise or interference generated during the reception and transmission of audio signals.
[0108] The mobile terminal 1000 also includes at least one sensor 1050, such as a light sensor, a motion sensor, and other sensors. Optionally, the light sensor includes an ambient light sensor and a proximity sensor. Optionally, the ambient light sensor can adjust the brightness of the display panel 1061 according to the ambient light level, and the proximity sensor can turn off the display panel 1061 and / or backlight when the mobile terminal 1000 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that recognize the phone's posture (such as landscape / portrait switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc. Other sensors that may be configured in the phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, will not be described in detail here.
[0109] The display unit 1060 is used to display information input by the user or information provided to the user. The display unit 1060 may include a display panel 1061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.
[0110] The user input unit 1070 can be used to receive input numerical or character information, and generate key signal inputs related to user settings and function control of the mobile terminal. Optionally, the user input unit 1070 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also known as a touch screen, can collect touch operations performed by the user on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch panel 1071), and drive the corresponding connection devices according to a pre-set program. The touch panel 1071 may include a touch detection device and a touch controller. Optionally, the touch detection device detects the user's touch position and the signal generated by the touch operation, and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, and sends it to the processor 1100, and can also receive and execute commands sent by the processor 1100. In addition, the touch panel 1071 can be implemented using various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 1070 may also include other input devices 1072. Optionally, other input devices 1072 may include, but are not limited to, one or more of the following: physical keyboard, function keys (such as volume control buttons, power buttons, etc.), trackball, mouse, joystick, etc., without being specifically limited here.
[0111] Optionally, the touch panel 1071 may cover the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits the information to the processor 1100 to determine the type of touch event. Subsequently, the processor 1100 provides corresponding visual output on the display panel 1061 based on the type of touch event. Although in Figure 4 In this embodiment, the touch panel 1071 and the display panel 1061 are two independent components to realize the input and output functions of the mobile terminal. However, in some embodiments, the touch panel 1071 and the display panel 1061 can be integrated to realize the input and output functions of the mobile terminal. The specific implementation is not limited here.
[0112] Interface unit 1080 serves as an interface through which at least one external device can connect to mobile terminal 1000. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, an audio input / output (I / O) port, a video I / O port, a headphone port, and so on. Interface unit 1080 may be used to receive input (e.g., data, power, etc.) from the external device and transmit the received input to one or more elements within mobile terminal 1000, or it may be used to transmit data between mobile terminal 1000 and the external device.
[0113] The memory 1090 can be used to store software programs and various data. The memory 1090 may primarily include a program storage area and a data storage area. Optionally, the program storage area may store the operating system, applications required for at least one function (such as sound playback, image playback, etc.), etc.; the data storage area may store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). Furthermore, the memory 1090 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.
[0114] The processor 1100 is the control center of the mobile terminal. It connects various parts of the mobile terminal via various interfaces and lines. By running or executing software programs and / or modules stored in the memory 1090, and by calling data stored in the memory 1090, it performs various functions and processes data of the mobile terminal, thereby providing overall monitoring of the mobile terminal. The processor 1100 may include one or at least two processing units; preferably, the processor 1100 may integrate an application processor and a modem processor. Optionally, the application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 1100.
[0115] The mobile terminal 1000 may also include a power supply 1110 (such as a battery) that supplies power to various components. Preferably, the power supply 1110 can be logically connected to the processor 1100 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system.
[0116] although Figure 4 As not shown, the mobile terminal 1000 may also include a Bluetooth module, etc., which will not be described in detail here.
[0117] The units / modules in the terminal of this application embodiment can be merged, divided, and deleted according to actual needs.
[0118] In this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions are generally described in detail only when they appear for the first time. When they appear again, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions that are not described in detail later can be referred to their previous relevant detailed descriptions.
[0119] In this application, the descriptions of the various embodiments have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0120] The technical features of the present application can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.
[0121] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
[0122] It is understood that the above scenarios are merely examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of this application. The technical solutions of this application can also be applied to other scenarios. For example, as those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.
[0123] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0124] The units in the device of this application embodiment can be merged, divided, and deleted according to actual needs.
[0125] In this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions are generally described in detail only when they appear for the first time. When they appear again, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of this application, the same or similar terms, concepts, technical solutions and / or application scenario descriptions that are not described in detail later can be referred to their previous relevant detailed descriptions.
[0126] In this application, the descriptions of the various embodiments have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0127] The technical features of the present application can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.
[0128] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A core structure, characterized by, include: A positive electrode plate (100) includes a first positive electrode portion (101), a first bent portion (102), and a second positive electrode portion (103) arranged sequentially. The negative electrode sheet (200) includes a first negative electrode portion (201), a second bent portion (202), and a second negative electrode portion (203) arranged sequentially. The first positive electrode portion (101), the first bent portion (102), the second positive electrode portion (103), and the first negative electrode portion (201) form a first cavity (500); the first negative electrode portion (201), the second bent portion (202), the second negative electrode portion (203), and the first positive electrode portion (101) form a second cavity (600); A positive electrode tab (300) is disposed on the first positive electrode portion (101) or the second positive electrode portion (103), and the positive electrode tab (300) is disposed corresponding to the first cavity (500); A negative electrode tab (400) is disposed on the first negative electrode portion (201) or the second negative electrode portion (203), and the negative electrode tab (400) is disposed correspondingly to the second cavity (600).
2. The core structure of claim 1, wherein The positive electrode plate (100) includes a first conductive current collector (110), and the positive electrode tab (300) is disposed on the side of the first conductive current collector (110) facing the first cavity (500); and / or, The negative electrode plate (200) includes a second conductive current collector (210), and the negative electrode tab (400) is disposed on the side of the second conductive current collector (210) facing the second cavity (600).
3. The core structure of claim 2, wherein The positive electrode (100) includes a first positive active layer (120) and a second positive active layer (130), wherein the first positive active layer (120) is located inside the first conductive current collector (110), and the second positive active layer (130) is located outside the first conductive current collector (110); and / or, The negative electrode sheet (200) includes a first negative electrode active layer (220) and a second negative electrode active layer (230). The first negative electrode active layer (220) is located inside the second conductive current collector (210), and the second negative electrode active layer (230) is located outside the second conductive current collector (210).
4. The core structure of claim 3, wherein The first positive electrode active layer (120) is provided with a first mounting groove, and the positive electrode tab (300) passes through the first mounting groove; and / or, The first negative electrode active layer (220) is provided with a second mounting groove, and the negative electrode tab (400) passes through the second mounting groove.
5. The core structure of claim 3, wherein In the first positive electrode portion (101), the first positive electrode active layer (120) and the second positive electrode active layer (130) are flush with one end facing the second bent portion (202); and / or, In the first negative electrode portion (201), the first negative electrode active layer (220) and the second negative electrode active layer (230) are flush with one end of the first bent portion (102).
6. The core structure according to any one of claims 1 to 5, characterized in that, Along the length of the first negative electrode portion (201), the length of the first cavity (500) is greater than the length of the positive electrode tab (300), and the positive electrode tab (300) is located between the first bent portion (102) and the first negative electrode portion (201); and / or, In the length direction of the first positive electrode portion (101), the length of the second cavity (600) is greater than the length of the negative electrode tab (400), and the negative electrode tab (400) is located between the second bent portion (202) and the first positive electrode portion (101).
7. The core structure according to any one of claims 1 to 5, characterized in that, The positive electrode tab (300) is disposed on the first positive electrode portion (101), and the negative electrode tab (400) is disposed on the first negative electrode portion (201); or, The positive electrode tab (300) is disposed on the second positive electrode portion (103), and the negative electrode tab (400) is disposed on the second negative electrode portion (203).
8. The core structure according to any one of claims 1 to 5, characterized in that, A diaphragm (700) is provided between the positive electrode (100) and the negative electrode (200), and a first part of the diaphragm (700) covers the surface of the positive electrode tab (300) facing the first cavity (500); The second portion of the diaphragm (700) covers the surface of the negative electrode tab (400) facing the second cavity (600).
9. A battery pack, characterized by, Includes the core structure as described in any one of claims 1 to 8.
10. A smart terminal, characterized by Includes the battery pack as described in claim 9.