Foldable battery and pole core for foldable battery

Abstract

The application discloses a foldable battery, pole cores and adapter sheets. The first pole core and the second pole core respectively comprise a pole core body and at least one pair of pole ears arranged on the pole core body. The first pole core is provided with a first pole ear and a second pole ear, and the second pole core is provided with a third pole ear and a fourth pole ear. The first pole ear and the second pole ear and the third pole ear and the fourth pole ear are respectively led out from opposite sides of the first pole core and the second pole core. The second pole ear and the fourth pole ear are opposite to the first pole ear in polarity, and the third pole ear is the same as the first pole ear in polarity. The adapter sheet is made of a conductive material with a foldable characteristic. The first pole ear and the third pole ear and the second pole ear and the fourth pole ear are connected through a first adapter sheet and a second adapter sheet, so that the distance between the first pole core and the second pole core has a foldable space. The first pole core and the second pole core are folded through the first adapter sheet and the second adapter sheet. The foldable battery has the advantages of being foldable.

Description

Technical Field

[0001] This application relates to the field of new energy battery technology, specifically to a foldable battery and an electrode core for a foldable battery. Background Technology

[0002] The diversification of electronic devices has spurred the development of battery technology. Electronic devices of different shapes and sizes require batteries of different shapes and sizes to achieve their functions and aesthetics. The emergence of foldable batteries has opened up more possibilities for electronic devices. The demand for and requirements of foldable batteries are constantly increasing in various scenarios.

[0003] Currently, foldable batteries typically achieve folding by folding the electrodes. However, due to the need for repeated folding in various applications, the electrodes are prone to breakage after repeated folding, causing the battery to malfunction. To address this issue, existing technologies have proposed folding the batteries through tab folding. However, when there are many layers of tabs, folding the tabs also makes them more susceptible to breakage.

[0004] Therefore, there is an urgent need to provide a foldable battery to solve the problem of easy breakage of the electrode plates or tabs in existing foldable batteries. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a foldable battery and an electrode core for the foldable battery, which can avoid the risk of electrode breakage due to repeated folding of the foldable battery. The specific solution is as follows: In one aspect, this application provides a foldable battery, including a first electrode core, a second electrode core, a first adapter plate, and a second adapter plate: The first electrode core and the second electrode core each include their own independent electrode core bodies and at least one pair of tabs disposed on their respective electrode core bodies; wherein, the first electrode core is provided with a first tab and a second tab, and the second electrode core is provided with a third tab and a fourth tab; the first tab and the second tab are led out from opposite sides of the first electrode core, and the third tab and the fourth tab are led out from opposite sides of the second electrode core; the polarities of the second tab, the fourth tab and the first tab are opposite, and the polarity of the third tab is the same as that of the first tab; The first adapter piece and the second adapter piece are made of conductive materials with bendable properties; the first electrode tab and the third electrode tab are connected through the first adapter piece, and the second electrode tab and the fourth electrode tab are connected through the second adapter piece. The connection provided by the first adapter piece and the second adapter piece allows for a foldable space between the first electrode core and the second electrode core, and the folding of the first electrode core and the second electrode core is achieved by using the first adapter piece and the second adapter piece.

[0006] Optionally, it also includes: a positive output terminal and a negative output terminal of the foldable battery, wherein the positive output terminal and the negative output terminal are respectively led out directly from corresponding tabs: The positive output terminal is connected to the first electrode tab, and the negative output terminal is connected to the second electrode tab or the fourth electrode tab; or the negative output terminal is connected to the first electrode tab, and the positive output terminal is connected to the second electrode tab or the fourth electrode tab; or The positive output terminal is connected to the third tab, and the negative output terminal is connected to the second or fourth tab; or the negative output terminal is connected to the third tab, and the positive output terminal is connected to the second or fourth tab. Optionally, the first tab and the third tab are connected via the first adapter piece, and the second tab and the fourth tab are connected via the second adapter piece, including: the first adapter piece is connected to the first tab and the third tab by welding or binding; and / or, the second tab and the fourth tab are connected via the second adapter piece, including the second adapter piece being connected to the second tab and the fourth tab by welding or binding.

[0007] Optionally, the first adapter piece includes a first adapter segment one and a first adapter segment two; the first adapter segment one is attached to a first surface on the same side of the first electrode tab and the third electrode tab, and the first adapter segment two is attached to a second surface on the opposite side of the first electrode tab and the third electrode tab; and / or The second adapter includes a second adapter segment one and a second adapter segment two; the second adapter segment one is attached to a first surface on the same side of the second electrode and the fourth electrode, and the second adapter segment two is attached to a second surface on the other side of the second electrode and the fourth electrode.

[0008] Optionally, the exposed portion of the first adapter piece that is not in contact with the first and third electrodes is covered with a flexible protective sleeve; and / or, the exposed portion of the second adapter piece that is not in contact with the second and fourth electrodes is covered with a flexible protective sleeve.

[0009] Optionally, it includes an aluminum-plastic film for providing battery encapsulation, wherein the tabs connected to the positive output terminal and the tabs connected to the negative output terminal are configured to have protruding ends extending beyond the edge of the aluminum-plastic film.

[0010] Optionally, the flexible protective sleeve is pressed against an aluminum-plastic film used for encapsulating the battery to fix the first electrode core and the second electrode core, as well as the first adapter piece and the second adapter piece.

[0011] Optionally, the first electrode tab is disposed at one end of the folded edge of the first electrode core near the folded position, the second electrode tab is disposed at the other end of the folded edge of the first electrode core near the folded position, the third electrode tab is disposed at one end of the folded edge of the second electrode core near the folded position, and the fourth electrode tab is disposed at the other end of the folded edge of the second electrode core near the folded position.

[0012] Secondly, this application also provides an electrode core for a foldable battery, including an electrode core body and a pair of tabs disposed on the electrode core body; the tabs are disposed on the edge of the electrode core body near the folding edge of the folding position.

[0013] Optionally, the pair of tabs disposed on the electrode core body includes a positive tab and a negative tab.

[0014] Compared with the prior art, this application has the following advantages: The foldable battery provided in this application uses two electrode cores as the main body of the foldable battery and a conductive material with bendable properties as an adapter plate. The two electrode cores are connected through the adapter plate, transforming the folding of the electrode sheets or tabs into the folding of the adapter plate. Since the adapter plate is bendable, it can prevent the breakage of the electrode sheets and tabs. For a single electrode core, tabs of different polarities are led out from opposite sides; for two electrode cores, tabs of the same polarity are placed on the same side adjacent to the folding edge. This design allows the two electrode cores to be connected by their respective tabs fitting into the adapter plate. The provided foldable direction corresponds to the foldable space provided between the two electrode cores, thereby realizing the folding of the two electrode cores. The adapter plate is also conductive, ensuring conductivity between the two electrode cores. Therefore, the technical solution provided in this application, by introducing an adapter plate to connect the tabs of the two electrode cores, transfers the folding area of ​​the foldable battery to the folding of the adapter plate, effectively avoiding damage to the foldable battery caused by the breakage of the electrode sheets and tabs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the foldable battery provided in the embodiments of this application.

[0016] Figure 2 This is a partially enlarged structural diagram of the adapter plate for the foldable battery provided in an embodiment of this application.

[0017] Figure 3 This is a schematic diagram of the structure of a foldable battery with a flexible protective sleeve provided in an embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the structure of a foldable battery encapsulated with an aluminum-plastic film according to an embodiment of this application.

[0019] Figure 5 This is a schematic diagram of the structure of an electrode core for a foldable battery provided in an embodiment of this application. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this application, the application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. However, this application can be implemented in many other ways different from those described below. Therefore, based on the embodiments provided in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0021] It should be noted that the terms "first," "second," "third," etc., in the claims, specification, and drawings of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. Such data are interchangeable where appropriate so that the embodiments of this application described herein can be implemented in a sequence other than that shown or described in this application. Furthermore, the terms "comprising," "having," and their variations are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0022] It should be understood that in the embodiments of this application, "at least one" means one or more, and "more than one" means two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the related objects before and after it are in an "or" relationship. "Contains A, B and / or C" means containing any one, two, or three of A, B, and C.

[0023] It should be understood that in the embodiments of this application, "B corresponding to A", "B corresponding to A", "A corresponds to B" or "B corresponds to A" means that B is associated with A, and B can be determined based on A. Determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0024] To facilitate understanding of the various embodiments of this application, the application background of the embodiments will be explained.

[0025] Traditional batteries, due to their fixed shape, struggle to adapt to the changing internal space of foldable devices, resulting in limited battery capacity or forced thicker casings. Foldable batteries, on the other hand, can flexibly adjust their shape when the device is folded, maximizing the use of internal space. Therefore, foldable batteries have emerged. Currently, most existing foldable batteries use direct folding at the center of the electrode or through the tabs. These folding methods are prone to breakage at the center of the electrode or the tabs after repeated folding, clearly indicating that the reliability and safety of such batteries need improvement. Existing technology also provides a foldable battery using screen-printed electrodes, where the center folding position of the electrode does not require an active material layer to prevent electrode breakage. However, this approach requires complex manufacturing processes and cannot effectively prevent electrode breakage.

[0026] To address the above issues, this application provides a foldable battery. It aims to avoid the risk of breakage when the electrodes or tabs are folded. The foldable battery provided in this application can be applied to foldable batteries in various professional fields, and this application is not specifically limited to it.

[0027] Please refer to Figure 1 and Figure 2 Understanding the embodiments of this application, Figure 1 This is a schematic diagram of the structure of the foldable battery provided in an embodiment of this application. Figure 2 This is a partially enlarged structural diagram of the adapter plate of the foldable battery provided in an embodiment of this application. The foldable battery 100 includes a first electrode core 11, a second electrode core 12, a first adapter plate 13, and a second adapter plate 14. Each electrode core includes an independent electrode core body and at least one pair of tabs disposed on its respective electrode core body. The electrode core body is the core component inside the battery, typically composed of alternating stacked or wound positive electrode sheets, negative electrode sheets, and a separator. It is the core component for the battery to carry out electrochemical reactions, responsible for storing and releasing electrical energy. The first electrode core 11 and the second electrode core 12 respectively include a first electrode core body 101 and a second electrode core body 102.

[0028] To facilitate the extraction of current from the battery core, each core is equipped with tabs. Tabs are typically thin metal sheets used to extract current from the battery and connect it to external circuits or devices. This is achieved by welding the tab metal strips to the positive and negative current collectors of the core. Tabs can be drawn from either the positive or negative electrode on either side of the core body. The tab drawn from the positive electrode is the positive tab, and the tab drawn from the negative electrode is the negative tab.

[0029] As shown in the figure, in one embodiment of this application, the first pole core 11 and the second pole core 12 further include a first tab 1011 and a second tab 1012 extending from the first pole core body 101, and a third tab 1021 and a fourth tab 1022 extending from the second pole core body 102. In this embodiment, the first pole core 11 and the second pole core 12 are separated from each other and exist independently, with the adjacent area of ​​the separation providing space for folding the two pole cores. To facilitate folding between the two pole cores, the two tabs of each pole core are arranged on opposite sides of their respective pole cores, that is, the first tab 1011 and the second tab 1012 are extended from opposite sides of the first pole core body 101, and the third tab 1021 and the fourth tab 1022 are extended from opposite sides of the second pole core body 102. The first tab 1011 and the third tab 1021 are at the same end, and the second tab 1012 and the fourth tab 1022 are at the same end on the opposite side.

[0030] In this design, the second tab 1012, the fourth tab 1022, and the first tab 1011 have opposite polarities, while the third tab 1021 has the same polarity as the first tab 1011. Specifically, taking the first tab as the positive electrode, the second and fourth tabs are the negative tabs, and the third tab is the positive tab. The positive tabs of the first and second electrode cores, as well as the negative tabs of the first and second electrode cores, are connected to each other via adapter plates to achieve the connection of the same-polarity tabs in the two electrode cores. This design allows the connected positive and negative tabs to serve as the positive and negative electrodes for subsequent battery packaging.

[0031] The first electrode core 11 and the second electrode core 12 are separated from each other by a certain distance, allowing them to be foldable. That is, the distance between the first electrode core and the second electrode core is such that there is a foldable space between them, thus enabling the folding of the first electrode core and the second electrode core by bending the first adapter piece 13 and the second adapter piece 14. The edges of the first electrode core 11 and the second electrode core 12 that are close to each other are called folding edges. The distance can refer to the distance between the two folding edges of the two electrode cores, which is the width of the foldable space. The lower limit of this width is obviously related to the thickness of the first electrode core 11 and the second electrode core 12, while the upper limit depends on the space provided by the electronic device to which the foldable battery needs to be installed; for example, in an embodiment provided for a foldable phone, it is about 3-5 millimeters. The tabs leading out from each electrode core are located on two adjacent edges of their respective folding edges, with the direction of the tabs parallel to the extension direction of the folding edges. At this time, the distance between the same-pole tabs of the two electrode cores is relatively close, but they cannot directly contact or connect. In this embodiment, a conductive material with bendable properties is used as an adapter piece, serving as the medium connecting the tabs of the two electrode cores, thereby achieving conductivity and folding between the first and second electrode cores. Specifically, the first tab 1011 and the third tab 1021 are connected via the first adapter piece 13, and the second tab 1012 and the fourth tab 1022 are connected via the second adapter piece 14. The adapter piece must possess conductivity and fatigue resistance properties, and is typically made of fatigue-resistant conductive materials such as aluminum alloys, stainless steel, nickel-based alloys, and cobalt-based alloys, specifically, for example, 7076-T6 aluminum alloy, 6086 aluminum alloy, 6061 aluminum alloy, and 316 stainless steel.

[0032] The technical solution described above achieves the folding of the first and second electrode cores by setting a first adapter plate and a second adapter plate between the two electrode cores. Theoretically, as long as the positive and negative electrode tabs of each of the two electrode cores are on opposite sides, and the same-pole tabs of the two electrode cores are connected on the same side by an adapter plate, the folding of the two electrode cores can be achieved, providing a technical basis for foldable batteries. Furthermore, to achieve better structure and performance of foldable batteries, more preferred methods are provided below.

[0033] To minimize the length of the adapter piece, the location of the tabs is further defined. In one embodiment, the first tab 1021 is located at one end of the first electrode core 101 near the folded edge, the second tab 1012 is located at the other end of the first electrode core 11 near the folded edge, the third tab 1021 is located at one end of the second electrode core 12 near the folded edge, and the fourth tab 1022 is located at the other end of the second electrode core 12 near the folded edge. Since the first tab 1011 and the third tab 1021, and the second tab 1012 and the fourth tab 1022 are all close to the folding area, the required lengths of the first and second adapter pieces are relatively short, but should be greater than the width of the folding area. This solution enables the folding of the first and second electrode cores in a material-saving manner through the connection of the first and second adapter pieces.

[0034] The tabs provided in this application embodiment can extend a certain distance to serve as the positive and negative terminals of the foldable battery. Specifically, which two of the four tabs are extended to serve as the positive and negative terminals of the foldable battery can be set according to actual needs. In one embodiment, the positive and negative terminals of the foldable battery include a positive output terminal and a negative output terminal, respectively, which are directly led out from their corresponding tabs. In one embodiment, the positive output terminal is electrically connected to the first tab and is directly led out from the first tab; the negative output terminal is electrically connected to the second or fourth tab and is directly led out from the second or fourth tab; or the negative output terminal is electrically connected to the first tab and is directly led out from the first tab; the positive output terminal is electrically connected to the second or fourth tab and is directly led out from the second or fourth tab. The positive output terminal is led out from the third electrode; or the positive output terminal is electrically connected to the third electrode, and the negative output terminal is electrically connected to the second or fourth electrode, and the negative output terminal is directly led out from the second or fourth electrode; or the negative output terminal is electrically connected to the third electrode, and the negative output terminal is directly led out from the third electrode; the positive output terminal is electrically connected to the second or fourth electrode, and the positive output terminal is directly led out from the second or fourth electrode. In other words, the first tab 1011 can be used as the positive terminal of the foldable battery, and the second tab 1021 or the fourth tab 1022 can be used as the negative terminal. In another embodiment, the first tab 1011 can be used as the negative terminal, and the second tab 1012 or the fourth tab 1022 can be used as the positive terminal. In yet another embodiment, the third tab 1021 can be used as the positive terminal, and the second tab 1012 or the fourth tab 1022 can be used as the negative terminal. In yet another embodiment, the third tab 1021 can be used as the negative terminal, and the second tab 1012 or the fourth tab 1022 can be used as the positive terminal. The tabs used as positive or negative terminals need to extend outwards a certain distance to connect to the battery's external wiring.

[0035] The aforementioned connection of the electrode tabs via the adapter piece can be achieved through welding or binding, aiming to electrically connect the electrode tabs at both ends of the adapter piece. For example, the welding method can be resistance welding, laser welding, etc., and the binding method includes crimping, bundling, etc. In one embodiment, the first adapter piece is connected to the first electrode tab and the third electrode tab by welding or binding; and / or, the second electrode tab and the fourth electrode tab are connected through a second adapter piece, including the second adapter piece being connected to the second electrode tab and the fourth electrode tab by welding or binding. Specifically, the connection of the first electrode tab and the third electrode tab through the first adapter piece includes: welding or binding one end of the first adapter piece 13 to the first electrode tab 1011 and the other end of the first adapter piece 13 to the third electrode tab 1021; and / or, the connection of the second electrode tab and the fourth electrode tab through the second adapter piece includes welding or binding one end of the second adapter piece to the second electrode tab and the other end of the second adapter piece to the fourth electrode tab. There can be one first adapter piece, which can be disposed on the surface of the first and third tabs. There can also be one second adapter piece, disposed on the surface of the second and fourth tabs. In this case, if the folding direction of the foldable battery is to rotate the two electrode cores outwards from the paper surface, then preferably, both the first and second adapter pieces are located on the outer side of the paper surface relative to the attached tabs. Thus, when folded, the first and second adapter pieces are located inside the folding area. Of course, folding in the opposite direction is also entirely feasible with this structure.

[0036] In practice, the first adapter piece and the second adapter piece are not limited to one. In one embodiment, the first adapter piece may include a first adapter segment one and a first adapter segment two, and the second adapter piece may also include a second adapter segment one and a second adapter segment two. Specifically, the first adapter segment one can be attached to a first surface on the same side of the first tab and the third tab, and the first adapter segment two can be attached to a second surface on the opposite side of the first tab and the third tab. This structure securely connects the first tab and the third tab via two opposing first adapter pieces, each adapter piece directly connected to the tab by welding or bonding. Similarly, the second adapter segment one can be attached to the first surface on the same side of the second tab and the fourth tab, and the second adapter segment two can be attached to the second surface on the opposite side of the second tab and the fourth tab, connecting the two opposing surfaces of the second tab and the fourth tab via adapter pieces. In this embodiment, the foldable battery can be folded arbitrarily in either the upward or downward direction. Because the adapter plate connection structure is provided on both opposite sides of the two tabs on the same side in this embodiment, the adapter plate can provide good support for the folding function regardless of whether the folding direction of the foldable battery is upward or downward.

[0037] In the aforementioned embodiment, a connector made of a conductive material with bendable properties was used to achieve the folding of the first and second pole pieces. However, in actual use, the buffering effect of the connector is insufficient to completely resist the wear caused by repeated folding. Therefore, a flexible protective sleeve can be provided on the connector to improve the toughness of the folded portion and prevent deformation and damage to the folded part. Please refer to... Figure 3 , Figure 3 This is a schematic diagram of a foldable battery with a flexible protective sleeve provided in an embodiment of this application. In one embodiment, a flexible protective sleeve 31 is fitted over the exposed portion of the first adapter piece that is not in contact with the first and third tabs; and / or, a flexible protective sleeve 31 is fitted over the exposed portion of the second adapter piece that is not in contact with the second and fourth tabs. Typically, the length of the adapter piece fitted by the flexible protective sleeve is not less than the width of the folding area provided by the disconnection between the first and second tabs, thereby improving the cushioning and toughness of the folding portion. The flexible protective sleeve is a protective structure made of flexible material, which may include materials with both flexibility and toughness such as ABS plastic, PC, and PVC, and the thickness of the flexible material can be 0.1-2 mm.

[0038] The tabs of the electrode core provided in this application embodiment can serve as the positive / negative electrodes of the foldable battery. The electrode core is an important component of the battery. It is further encapsulated into a foldable battery based on the structure provided above. Electrolyte needs to be injected during the encapsulation process. Please continue reading. Figure 3 In one embodiment, the foldable battery further includes an aluminum-plastic film 32 for providing battery encapsulation. The aluminum-plastic film 32 can fix structures such as electrode cores and adapter plates by pressing. Specifically, the tab serving as the positive electrode of the foldable battery is configured with a first protruding end extending beyond the edge of the aluminum-plastic film; correspondingly, the tab serving as the negative electrode of the foldable battery is configured with a second protruding end extending beyond the edge of the aluminum-plastic film. The first and second protruding ends respectively constitute the positive and negative electrodes of the foldable battery. Two examples are given here; please refer to the following for the first example. Figure 3 With the first tab 1011 as the positive electrode, and the first protruding end 301 of the first tab 1011 located outside the upper edge of the aluminum-plastic film, the first protruding end 301 can serve as the positive electrode of the foldable battery. Correspondingly, the second tab 1012 is the negative electrode, and the second protruding end 302 of the second tab 1012 is configured to extend beyond the edge of the aluminum-plastic film, so the second protruding end 302 can serve as the negative electrode of the foldable battery. (See the second example.) Figure 4 , Figure 4 This is a schematic diagram of a foldable battery encapsulated in an aluminum-plastic film according to an embodiment of this application. Taking the first tab as the positive electrode, the first protruding end 401 of the first tab 1011 is located outside the edge of the aluminum-plastic film. The first protruding end 401 can serve as the positive electrode of the foldable battery. Correspondingly, the fourth tab 1022 is the negative electrode, and the second protruding end 402 of the fourth tab 1022 is configured to extend beyond the edge of the aluminum-plastic film. The second protruding end 402 can serve as the negative electrode of the foldable battery. Other possible configurations also fall within the scope of this application, but since they are similar to the two examples above, they will not be exemplified here.

[0039] In one embodiment, the width of the aluminum-plastic film on the side where the adapter piece is welded to the electrode tab can exceed the flexible protective sleeve on the adapter piece by 1-5 mm. During packaging, the aluminum-plastic film and the flexible protective sleeve are heat-pressed together to better fix the adapter piece.

[0040] The foldable battery provided in this application embodiment folds two independent electrode cores and converts the folded structure into an adapter plate, avoiding the risk of breakage of the electrode plates and tabs. A flexible protective sleeve further wraps the folded portion of the adapter plate, enhancing its cushioning effect and preventing deformation damage. The tabs of the electrode cores extend beyond the edge of the aluminum-plastic film, achieving the positive and negative electrode functions of the battery with a simple structural design. Through the ingenious placement of the tabs and the folding area, a foldable battery that is not easily broken and has a simple structure is provided. Therefore, the foldable battery provided in this application embodiment has the advantage of greater reliability, effectively resolving the contradiction between space utilization, safety, and flexibility in electronic devices, and providing key power for foldable and wearable devices.

[0041] This application also provides an electrode core for a foldable battery. Since the structure of the electrode core has been described in detail in the aforementioned embodiments of the foldable battery, it will be described simply in the following sections. For details of the related technical features and the effects achieved, please refer to the corresponding descriptions of the aforementioned embodiments of the foldable battery.

[0042] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of an electrode core for a foldable battery provided in an embodiment of this application. The electrode core 51 for the foldable battery includes an electrode core body 501 and a pair of tabs 502 disposed on the electrode core body; the tabs 502 are disposed on the edge of the electrode core body 501 near the folding edge A. The tabs 502 are a positive tab and a negative tab, respectively, and are disposed at both ends of the folding edge. Please refer to the foregoing embodiment for detailed description.

[0043] The electrode core for foldable batteries provided in this application embodiment is configured with two electrode cores and two tabs leading out from each core. It can be used in battery design. By connecting the tabs of the same electrode cores to each other, the folding of a battery is transformed from the folding of the electrode cores to the folding of the connecting plates between the two electrode cores. This provides a solution to avoid electrode damage and improve the folding resistance of foldable batteries.

[0044] Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of this application. Therefore, the scope of protection of this application should be determined by the scope defined in the claims of this application.

Claims

1. A foldable battery, characterized in that, Includes the first electrode core, the second electrode core, the first adapter plate, and the second adapter plate: The first electrode core and the second electrode core each include their own independent electrode core bodies and at least one pair of tabs disposed on their respective electrode core bodies; wherein, the first electrode core is provided with a first tab and a second tab, and the second electrode core is provided with a third tab and a fourth tab; the first tab and the second tab are led out from opposite sides of the first electrode core, and the third tab and the fourth tab are led out from opposite sides of the second electrode core; the polarities of the second tab, the fourth tab and the first tab are opposite, and the polarity of the third tab is the same as that of the first tab; The first adapter piece and the second adapter piece are made of conductive materials with bendable properties; the first electrode tab and the third electrode tab are connected through the first adapter piece, and the second electrode tab and the fourth electrode tab are connected through the second adapter piece. The connection provided by the first adapter piece and the second adapter piece allows for a foldable space between the first electrode core and the second electrode core. The first electrode core and the second electrode core can be folded by bending the first adapter piece and the second adapter piece.

2. The foldable battery according to claim 1, characterized in that, It also includes a positive output terminal and a negative output terminal of the foldable battery, wherein the positive output terminal and the negative output terminal are respectively led out directly from corresponding tabs, including: The positive output terminal is electrically connected to the first electrode tab, and the negative output terminal is electrically connected to the second electrode tab or the fourth electrode tab; or the negative output terminal is electrically connected to the first electrode tab, and the positive output terminal is electrically connected to the second electrode tab or the fourth electrode tab; or The positive output terminal is electrically connected to the third electrode, and the negative output terminal is electrically connected to the second or fourth electrode; or the negative output terminal is electrically connected to the third electrode, and the positive output terminal is electrically connected to the second or fourth electrode.

3. The foldable battery according to claim 1, characterized in that, The first electrode and the third electrode are connected by the first adapter piece, and the second electrode and the fourth electrode are connected by the second adapter piece, including: the first adapter piece is connected to the first electrode and the third electrode by welding or binding; and / or, the second electrode and the fourth electrode are connected by the second adapter piece, including the second adapter piece being connected to the second electrode and the fourth electrode by welding or binding.

4. The foldable battery according to claim 3, characterized in that, The first adapter piece includes a first adapter segment one and a first adapter segment two; the first adapter segment one is attached to a first surface on the same side of the first electrode tab and the third electrode tab, and the first adapter segment two is attached to a second surface on the other side of the first electrode tab and the third electrode tab. and / or The second adapter plate includes a second adapter segment one and a second adapter segment two; The second adapter piece one is attached to the first surface of the second electrode and the fourth electrode on the same side, and the second adapter piece two is attached to the second surface of the second electrode and the fourth electrode on the other side.

5. The foldable battery according to claim 2, characterized in that, The exposed portion of the first adapter piece that is not in contact with the first electrode and the third electrode is covered with a flexible protective sleeve; and / or, the exposed portion of the second adapter piece that is not in contact with the second electrode and the fourth electrode is covered with a flexible protective sleeve.

6. The foldable battery according to claim 2, characterized in that, Includes an aluminum-plastic film for providing battery encapsulation, wherein the tabs connected to the positive output terminal and the tabs connected to the negative output terminal are configured to have protruding ends extending beyond the edge of the aluminum-plastic film.

7. The foldable battery according to claim 5, characterized in that, The flexible protective sleeve is pressed together with the aluminum-plastic film used for encapsulating the battery to fix the first electrode core and the second electrode core, as well as the first adapter piece and the second adapter piece.

8. The foldable battery according to claim 1, characterized in that, The first electrode tab is disposed at one end of the folded edge of the first electrode core near the folded position, the second electrode tab is disposed at the other end of the folded edge of the first electrode core near the folded position, the third electrode tab is disposed at one end of the folded edge of the second electrode core near the folded position, and the fourth electrode tab is disposed at the other end of the folded edge of the second electrode core near the folded position.

9. A core for a foldable battery, characterized in that, It includes an electrode core body and a pair of electrode tabs disposed on the electrode core body; the electrode tabs are disposed on the edge of the electrode core body near the folding position.

10. The electrode core for a foldable battery according to claim 9, characterized in that, The pair of tabs disposed on the core body include a positive tab and a negative tab, and are disposed at both ends of the folded edge.

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