A battery, a battery pack, and an electronic device

Abstract

The application provides a battery, a battery pack and an electronic device, relates to the technical field of electronic devices, and can keep the interface between the positive pole piece, the negative pole piece and the electrolyte in the battery in good contact, so as to improve the working performance of the battery. Specifically, the battery comprises a shell and a bare battery core. The shell comprises a sealed cavity, and the shell has a first wall plate and a second wall plate arranged at intervals. The bare battery core is arranged in the sealed cavity, and the bare battery core comprises at least one first through hole, the first through hole is provided with a first support, and the two ends of the first support are connected with the first wall plate and the second wall plate respectively, so as to avoid the first wall plate and the second wall plate from moving away from each other.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and more particularly to a battery, battery pack, and electronic equipment. Background Technology

[0002] Currently, batteries are widely used in various electronic devices to provide power. However, batteries experience volume expansion during charging and discharging. This expansion can lead to poor interfacial contact between the positive electrode, negative electrode, and electrolyte, resulting in unstable electrochemical reaction pathways during charging and discharging, and consequently, poor battery performance. Therefore, improving the contact between the positive electrode, negative electrode, and electrolyte in a battery has become a pressing issue. Summary of the Invention

[0003] Embodiments of this application provide a battery, battery pack, and electronic device that enable good contact between the interfaces of the positive electrode, negative electrode, and electrolyte in the battery, thereby improving the battery's performance.

[0004] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0005] In a first aspect, some embodiments of this application provide a battery comprising a casing and a bare cell. The casing includes a sealed cavity and has a first wall plate and a second wall plate arranged at intervals. The bare cell is disposed within the sealed cavity and includes at least one first through hole. A first support member is disposed within the first through hole, and both ends of the first support member are respectively connected to the first wall plate and the second wall plate to prevent the first wall plate and the second wall plate from moving away from each other.

[0006] When the bare cell expands during charging and discharging, the casing can restrict and constrain the expansion. The first and second wall panels are arranged at intervals, such that they are located on opposite sides of different surfaces of the bare cell. For example, the first and second wall panels are located on opposite sides of the bare cell along a first direction, which can be the stacking direction of the positive and negative electrode plates in the bare cell.

[0007] When the bare cell tends to expand along the first direction, the expansion of the bare cell exerts a force on the first and second wall plates, causing them to move away from each other. Due to their structural strength, the first and second wall plates of the casing have a resistance to maintain their original position and shape. Therefore, the first and second wall plates act as a constraint on the bare cell to prevent it from continuing to expand.

[0008] In other words, the higher the structural strength of the casing, the more significant the constraint effect of the first and second wall panels on the bare battery cells, thus more effectively restraining the deformation of the bare battery cells. Therefore, the first and second wall panels can be connected by other structures within the casing itself, such as by side wall panels, or by the first support member.

[0009] In this way, the first support member is located between the first wall plate and the second wall plate. The first support member can prevent the first wall plate and the second wall plate from moving away from each other under the squeezing force generated by the bare cell, thereby strengthening the constraint effect of the first wall plate and the second wall plate on the bare cell. This can effectively avoid the problem of poor contact of internal active materials caused by the expansion of the bare cell, and ensure that the battery maintains good performance.

[0010] Secondly, the first support member is added to connect the first wall panel and the second wall panel. The compressive force between the first wall panel and the second wall panel can be distributed to the first support member, which is conducive to the uniform force between the first wall panel and the second wall panel. In other words, the force between the first wall panel and the bare cell, and between the second wall panel and the bare cell, is more uniform, avoiding the problem of stress concentration between the first wall panel, the second wall panel and the bare cell.

[0011] The first and second wall plates form a uniform constraint force on the bare cell. This uniform constraint force ensures that the positive and negative electrode plates inside the bare cell maintain good contact with the electrolyte, reducing the problem of high internal resistance caused by poor electrode contact and improving the charging and discharging efficiency and energy density of the battery.

[0012] Furthermore, when the battery experiences external stress impacts, such as drops, collisions, or compression, the first support member can also provide support and cushioning, maintaining the original state of the first and second wall panels. The first support member can absorb some of the energy from the external stress impacts, thereby reducing the energy transmitted to the bare cell surface. Therefore, the first support member can also reduce the damage to the bare cell caused by external stress impacts.

[0013] Furthermore, the battery described above enhances the structural strength of the casing itself through the first support member, which is located inside the casing. Compared to the battery in the above embodiment, the battery in this embodiment does not affect the external structure of the battery, and the external structure of the battery can maintain its original shape, such as the battery being a regular square block, flat shape, etc.

[0014] The battery's compact overall structure avoids taking up too much space, thus improving the space utilization of electronic devices. Furthermore, the shape of the battery's external structure, i.e., the shape of the casing, facilitates battery installation in the battery compartment, avoiding the influence of external structures on battery installation.

[0015] In one possible implementation of the first aspect, the axis of one of the first through holes passes through the geometric center of the bare cell. In this way, the first support is positioned at the geometric center of the cell, and the first support can effectively and evenly distribute and support the stress between the first wall plate and the bare cell, and between the second wall plate and the bare cell, thereby improving the stability and rigidity of the overall housing structure.

[0016] Furthermore, the increased structural strength of the casing enhances the constraint and limitation effect of the first and second wall plates on the expansion of the bare cell, thereby extending the lifespan of the bare cell. This effectively avoids problems caused by poor contact of internal active materials due to cell expansion, ensuring the battery maintains optimal performance.

[0017] In one possible implementation of the first aspect, the bare battery cell includes positive and negative electrode sheets stacked along a first direction, and also includes a first surface and a second surface facing away from each other along the first direction; a first wall plate is attached to the first surface, and a second wall plate is attached to the second surface. In this way, the position and direction of the first support member correspond to the location of the bare battery cell where deformation is greatest. The first support member can increase the structural strength of the casing against stress along the first direction, thereby preventing the first and second wall plates from moving away from each other under the expansion and compression of the bare battery cell.

[0018] In one possible implementation of the first aspect, the casing further includes a sidewall panel connected between the first and second sidewall panels, with the battery cell spaced apart from the inner wall of the sidewall panel. In this way, the sidewall panel is located on the side of the bare battery cell where deformation is less, allowing the bare battery cell to release some expansion through the gap on one side of the sidewall panel, reducing localized stress concentration on the side of the bare battery cell. The first and second sidewall panels work together with the sidewall panel to constrain and regulate the expansion of the bare battery cell, ensuring good contact between the active materials inside the bare battery cell, thereby improving battery performance.

[0019] In one possible implementation of the first aspect, the battery further includes a cylindrical insulating sealing portion located in the first through hole and sealed between the first wall plate and the second wall plate, with a first support member disposed within the insulating sealing portion. In this way, the bare cell will not corrode the first support member, and the first support member will not affect the working performance of the bare cell. The distance between the first support member and the bare cell is not limited, and their relative positions can be more flexible. Furthermore, when the distance between the first support member and the bare cell is small, or even when they can directly contact each other, the diameter of the first through hole can be set smaller, thereby increasing the physical volume of the bare cell and improving its energy density.

[0020] In one possible implementation of the first aspect, the first support member and the insulating seal are spaced apart. This way, when the bare cell expands and when the first support member deforms to prevent the first and second wall panels from moving away from each other, there is a gap between the first support member and the insulating seal. This prevents contact or collision between the first support member and the insulating seal, thereby preventing damage to the first support member and the insulating seal due to collision, so that the first support member can play a good role in fixing the first and second wall panels.

[0021] In one possible implementation of the first aspect, at least a portion of the first support member is a rigid member, and / or at least a portion of the first support member is an elastic member.

[0022] In this way, the rigid support effectively prevents the first and second wall panels from moving apart under external forces or internal pressure, maintaining the stability of the overall battery structure. The rigid support resists deformation, thus protecting the internal battery components. It helps maintain the relative positions of the internal components, improving assembly accuracy and overall battery performance. Furthermore, the rigid support increases the overall strength of the casing, enabling it to withstand greater external forces.

[0023] In this way, the flexible support can provide cushioning when subjected to external forces or internal pressure, reducing the impact on sensitive components inside the battery. The flexible component can adapt to certain dimensional changes, such as the stress generated by volume changes during battery charging and discharging. The flexible support can absorb and disperse vibration energy, reducing vibration damage to the battery during transportation and use. In cases where minor displacement of internal battery components may occur, the flexible support helps maintain good contact between electrodes and other components.

[0024] In one possible implementation of the first aspect, the first support member includes a support portion and an insulating layer. The support portion is connected between the first wall panel and the second wall panel, and the insulating layer covers the outer peripheral surface of the support portion. In this way, the support portion can be made of a material with high structural strength, thereby increasing the overall structural strength of the first support member while maintaining a fixed volume. Furthermore, given a fixed structural strength, the support portion can reduce the volume of the first support member, and the volume of the first through-hole accommodating the first support member can also be made smaller, thereby increasing the physical volume of the bare battery cell and thus improving its energy density.

[0025] The insulating layer provides insulation and covers the outer surface of the support to maintain insulation between the first support and the bare battery cell. Therefore, the first support can balance structural strength and insulation, thereby ensuring the battery's structural stability and charge / discharge performance.

[0026] In one possible implementation of the first aspect, the elastic element includes at least one of sponge, rubber, silicone, spring, disc spring, and torsion spring. This results in a variety of support types, with different types of elastic elements having different elastic moduli and deformation ranges. Appropriate elastic elements can be selected based on the specific application and expected operating conditions of the battery to better accommodate volume changes during cyclic use.

[0027] In one possible implementation of the first aspect, the end of the elastic member near the first wall panel is connected to the first wall panel, and the end of the elastic member near the second wall panel is connected to the second wall panel, with the elastic member in a stretched state. This simplifies the connection between the elastic member and the first and second wall panels, facilitating installation and improving battery assembly efficiency, thereby increasing battery production efficiency. Furthermore, the direct connection of the elastic member to the casing avoids other connecting parts occupying the space of the first through-hole, allowing the first through-hole to be smaller, thus increasing the proportion of the solid area of ​​the bare cell and improving the battery's energy density.

[0028] In one possible implementation of the first aspect, the elastic element includes a first end facing the first wall panel and a second end facing the second wall panel; the first end is connected to the second wall panel, and the second end is connected to the first wall panel, with the elastic element in a compressed state. In this way, the rebound force provided by the elastic element in the compressed state is less than the rebound force provided by the elastic element in the stretched state, because the elastic element is prone to material fatigue when in a stretched state, leading to fatigue damage. Therefore, the elastic element in a compressed state can provide a stable and reliable force to the first and second wall panels, thereby preventing the first and second wall panels from moving away from each other.

[0029] In one possible implementation of the first aspect, the housing further includes a first connector and a second connector. One end of the first connector is connected to the second wall panel, and the other end of the first connector is connected to the first end. The first connector connects the first end of the elastic element to the second wall panel, and the second connector connects the second end of the elastic element to the first wall panel, thereby providing a force to prevent the first and second wall panels from moving away from each other when the elastic element is in a compressed state. The connector has a simple structure and is easy to assemble.

[0030] In one possible implementation of the first aspect, the housing further includes a side wall panel connected between the first wall panel and the second wall panel; the battery further includes a second support member disposed within a sealed cavity, the second support member being connected between the first wall panel and the second wall panel, and located between the side wall panel and the bare battery cell.

[0031] In this way, the first wall panel and the second wall panel are fixedly connected by the first support member and the second support member. The first support member and the second support member can prevent the first wall panel and the second wall panel from moving away from each other due to the expansion stress of the bare cell, improve the constraint and restriction effect of the first wall panel and the second wall panel on the bare cell, and thus ensure good contact between the active materials inside the bare cell, thereby improving battery performance.

[0032] In one possible implementation of the first aspect, there are multiple first through holes, and the number of first support members is equal to and corresponds one-to-one with the number of first through holes. Multiple first support members can uniformly constrain and limit the expansion of the bare battery cell, and the first and second wall plates can effectively limit the deformation of the bare battery cell during charging and discharging, which is beneficial for maintaining the overall shape and size of the bare battery cell and extending its service life.

[0033] In one possible implementation of the first aspect, the battery further includes a first equalizing member, which is stacked on the surface of the first wall panel facing away from the second wall panel, and the first equalizing member is capable of applying a force from the first wall panel to the second wall panel to the first wall panel; and / or, the battery further includes a second equalizing member, which is stacked on the surface of the second wall panel facing away from the first wall panel, and the second equalizing member is capable of applying a force from the second wall panel to the first wall panel to the second wall panel.

[0034] In this way, the battery can improve the constraint and restriction effect of the casing on the bare cell with the help of the first and second voltage equalization components, thereby ensuring good contact of the active materials inside the bare cell and thus maintaining good battery performance.

[0035] Secondly, this application also provides a battery pack comprising a plurality of batteries, wherein the batteries are any of the batteries described in the above embodiments.

[0036] In this way, any of the batteries in the above embodiments can be applied to a battery pack, and the structural performance and charge / discharge performance of at least some of the batteries in the battery pack can be improved, thereby improving the overall performance of the battery pack.

[0037] In one possible implementation of the second aspect, the casings of two adjacent batteries share a single wall panel. This facilitates the reduction in the thickness and weight of the battery pack.

[0038] In one possible implementation of the second aspect, the multiple batteries include adjacent first and second batteries. The orthographic projection of a first support member within the first battery onto a first reference plane does not overlap with the orthographic projection of a first support member within the second battery onto the first reference plane. The first reference plane is perpendicular to a first direction, which is the stacking direction of the electrode sheets in the battery. In this way, the first support members in adjacent batteries of the battery pack do not overlap in the first direction, which helps the support members disperse the stress generated by the expansion of the bare cells and improves the constraint and restraint effect of the casing on the bare cells.

[0039] Thirdly, this application also provides an electronic device, which includes a housing and a battery, with a battery compartment inside the housing and the battery installed inside the battery compartment;

[0040] In one possible implementation of the third aspect, the electronic device includes a housing and a battery pack, the battery pack being installed within a battery compartment.

[0041] Since the electronic device provided in this application embodiment includes the battery of any of the above technical solutions, both can solve the same technical problem and achieve the same effect. Attached Figure Description

[0042] Figure 1 Perspective views of electronic devices provided in some embodiments of this application;

[0043] Figure 2 for Figure 1 An exploded view of the electronic device shown.

[0044] Figure 3 A perspective view of a battery provided for some embodiments of this application;

[0045] Figure 4 for Figure 3 Exploded view of the battery shown;

[0046] Figure 5 for Figure 4 The exploded view of the battery cell shown.

[0047] Figure 6 for Figure 4 The diagram shows a partial structural illustration of a battery cell cut along line AA.

[0048] Figure 7 for Figure 4 The diagram shows another structural design of the battery cell cut along line AA.

[0049] Figure 8 A schematic diagram illustrating the changes in silicon material during the charging and discharging process of a battery, provided for some embodiments of this application;

[0050] Figure 9This application provides schematic diagrams of the battery structure for some embodiments.

[0051] Figure 10 for Figure 9 A schematic diagram of the battery structure cut along line BB;

[0052] Figure 11 A cross-sectional structural schematic diagram of a battery provided for some embodiments of this application;

[0053] Figure 12 A cross-sectional structural schematic diagram of a battery provided in some embodiments of this application;

[0054] Figure 13 for Figure 12 A top view of the bare cells in the battery shown.

[0055] Figure 14 This application provides schematic diagrams of the structure of a battery cell for some of its embodiments.

[0056] Figure 15 for Figure 14 A schematic diagram of the bare cell structure in the battery cell shown;

[0057] Figure 16 for Figure 15 The diagram shows a bare battery cell cut along the DD line.

[0058] Figure 17 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0059] Figure 18 for Figure 17 The diagram shows the structure of the bare cell in the battery cell.

[0060] Figure 19 A cross-sectional structural schematic diagram of a battery provided in some embodiments of this application;

[0061] Figure 20 A cross-sectional structural schematic diagram of a battery provided in some embodiments of this application;

[0062] Figure 21 for Figure 20 Top view of the battery concealed housing;

[0063] Figure 22 A cross-sectional structural schematic diagram of a battery provided in some embodiments of this application;

[0064] Figure 23 A cross-sectional structural schematic diagram of a battery provided in some embodiments of this application;

[0065] Figure 24 A cross-sectional structural schematic diagram of a battery provided in some embodiments of this application;

[0066] Figure 25 for Figure 24 The image shows a top view of the battery after its casing has been concealed.

[0067] Figure 26 A cross-sectional structural schematic diagram of a battery provided in some embodiments of this application;

[0068] Figure 27 This application provides structural schematic diagrams of vehicles for some embodiments;

[0069] Figure 28 for Figure 27 The diagram shows the structure of the battery pack in the vehicle.

[0070] Figure Labels

[0071] 100. Electronic device; 10. Screen; 11. Light-transmitting cover; 12. Display screen; 20. Housing; 21. Back cover; 22. Frame; 23. Middle plate; 24. Battery compartment; 30. Battery;

[0072] 311. Bare battery cell; M1. First surface; M2. Second surface; M3. Side surface; M4. First outer peripheral surface; M5. Second outer peripheral surface;

[0073] 311a, Positive electrode; P11, Positive current collector; P12, Positive electrode material; 311b, Negative electrode; P21, Negative current collector; P22, Negative electrode material; S, Separator; 311d, Electrolyte; 311e, Electrolyte solution; H1, First through hole;

[0074] 312, shell; 312a, sealing cavity; 312b, first wall panel; 312c, second wall panel; 312d, side wall panel;

[0075] 313, First support member; 313a, Support part; 313b, Insulating layer; 314, Second support member;

[0076] 320. Housing; 321. First outer surface; 322. Second outer surface; 33. Protective plate;

[0077] 34. Insulating and sealing parts;

[0078] 35. Connector; 351. First connector; 351a. First connecting segment; 351b. Second connecting segment; 352. Second connector; 352a. Third connecting segment; 352b. Fourth connecting segment;

[0079] T, tab; T11, tab structure; T1, first tab; T2, second tab; 40, pressure application structure; 41, first pressure plate; 42, second pressure plate; 43, connector; 431, connecting rod; 432, locking component; 50, battery pack; 51, first battery; 52, second battery; 53, third battery; 61, first equalizing component; 62, second equalizing component; 200, vehicle. Detailed Implementation

[0080] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0081] In embodiments of this application, 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 limitation, 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.

[0082] In the embodiments of this application, "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, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0083] This application relates to a battery and an electronic device. To facilitate the description of the embodiments below, some technical terms that will be mentioned in the embodiments of this application will be introduced first before describing the embodiments of this application. Specifically:

[0084] Battery casing: refers to the part of the battery used to encapsulate and protect the bare cells. Casing includes, but is not limited to, steel casing and aluminum-plastic film.

[0085] Aluminum-plastic film: also known as aluminum-plastic packaging film, it consists of at least three layers. The middle layer is an aluminum layer, which acts as a moisture barrier. The outer layer is a nylon adhesive layer, which prevents the penetration of air, especially oxygen. The inner layer is a polypropylene (PP) layer, which seals the film and prevents the electrolyte from corroding the aluminum layer. The inner layer of the aluminum-plastic film is in contact with the electrolyte.

[0086] Electrolyte: Present in the pores of the bare battery cell inside the casing, serving as a carrier for lithium ions within the battery. Electrolytes are generally prepared under specific conditions and in specific proportions from high-purity organic solvents, lithium electrolyte salts, and necessary additives.

[0087] Bare battery cell: consists of a positive electrode, a negative electrode, and a separator. Both the positive and negative electrodes include a current collector and electrode material coated on the current collector. The current collector for the positive electrode is typically aluminum foil, while that for the negative electrode is typically copper foil. The separator, also called a separating membrane, is placed between the positive and negative electrodes to prevent direct contact and short circuits. The separator is typically made of porous polyolefin membrane.

[0088] Winded bare battery cell: It is formed by stacking and winding four layers of materials: positive electrode plate, separator, negative electrode plate, and separator.

[0089] Stacked bare battery cell: This type comprises positive and negative electrode plates that are alternately stacked together, with a separator between adjacent positive and negative electrode plates. Both the positive and negative electrode plates include a current collector and an electrode material coated on the current collector. The current collector for the positive electrode plate is typically aluminum foil.

[0090] The current collector for the negative electrode is typically copper foil. A separator separates the positive and negative electrodes to prevent direct contact and short circuits. The separator can be a separator bag, a separator folded in a Z-shape, or multiple single separators. This application does not limit the specific structural form of the separator in a stacked bare cell, as long as it can effectively insulate and isolate the positive and negative electrodes. The separator material is typically a polyolefin porous membrane. Compared to wound bare cells, stacked bare cells offer stronger fast charging capabilities and greater flexibility in shape and tab placement design.

[0091] Battery cell: The structure obtained by packaging a bare battery cell with a casing and injecting electrolyte is called a battery cell.

[0092] Battery packaging: The process of combining the battery cell, protection board and other auxiliary materials into a complete battery.

[0093] This application provides an electronic device. The electronic device is a type of electronic device that includes a battery. Specifically, the electronic device includes, but is not limited to, mobile phones, tablet personal computers, laptop computers, personal digital assistants (PDAs), personal computers, notebook computers, in-vehicle devices, and wearable devices.

[0094] Please see Figure 1 and Figure 2 , Figure 1 A perspective view of an electronic device 100 provided in some embodiments of this application. Figure 2 for Figure 1 The diagram shows an exploded view of the electronic device 100. The electronic device 100 can be a mobile phone; this embodiment uses a candybar phone as an example, but in other embodiments, the phone can also be a foldable phone.

[0095] The electronic device 100 includes a screen 10, a housing 20, electrical components, a charging management module, a power management module, and a battery 30.

[0096] Understandable, Figure 1 and Figure 2 The accompanying drawings below only schematically illustrate some components included in the electronic device 100; the actual shape, size, location, and construction of these components are not subject to change. Figure 1 and Figure 2 As well as the accompanying figures below. For example, in some other examples, the electronic device 100 may not include the screen 10.

[0097] Furthermore, for the convenience of describing the embodiments below, an XYZ coordinate system is established. Specifically, the width direction of the electronic device 100 is defined as the X-axis direction, the length direction of the electronic device 100 as the Y-axis direction, and the thickness direction of the electronic device 100 as the Z-axis direction. It is understood that the coordinate system setting of the electronic device 100 can be flexibly set according to actual needs, and no specific limitation is made here.

[0098] Screen 10 is used to display images, videos, etc. Screen 10 includes a light-transmitting cover 11 and a display screen 12. The light-transmitting cover 11 and the display screen 12 are stacked together. The light-transmitting cover 11 is mainly used to protect the display screen 12 and prevent dust.

[0099] The housing 20 is used to protect the internal electronic components of the electronic device 100. The housing 20 may include a back cover 21 and a bezel 22. The back cover 21 is located on the side of the display screen 12 away from the light-transmitting cover plate 11 and is spaced apart from the display screen 12. The bezel 22 is located between the back cover 21 and the screen 10 and is disposed along the edge of the back cover 21 and the edge of the screen 10.

[0100] The frame 22 is fixed to the back cover 21. For example, the frame 22 can be fixed to the back cover 21 using adhesive. Alternatively, the frame 22 and the back cover 21 can be integrally formed, i.e., the frame 22 and the back cover 21 are a single structure. A light-transmitting cover 11 is fixed to the frame 22, and the light-transmitting cover 11, the frame 22, and the back cover 21 form a receiving cavity. This receiving space accommodates the electrical components, the charging management module, the power management module, and the battery 30.

[0101] In some embodiments, please refer to the following: Figure 2 The housing 20 also includes a middle plate 23. The middle plate 23 is fixed to the inner surface of the frame 22. For example, the middle plate 23 can be fixed to the frame 22 by welding. The middle plate 23 can also be integrally formed with the frame 22. The middle plate 23 serves as the structural "skeleton" of the electronic device 100, supporting and fixing the electronic components inside the electronic device 100.

[0102] The outer casing 20 contains a battery compartment 24 for accommodating a battery 30. In some embodiments, the surface of the middle plate 23 facing the back cover 21 has a groove that forms the battery compartment 24, meaning the middle plate 23 can serve as the bottom wall of the battery compartment 24. Electronic components such as a main board, speaker module, and sub-board are also housed within the space between the middle plate 23 and the back cover 21, and these electronic components are located on both sides of the battery compartment 24 along the Y-axis.

[0103] In other embodiments, the electronic device 100 may omit the middle plate 23 and instead use... Figure 2 The display screen 12 forms the bottom wall of the battery compartment 24.

[0104] Battery 30 is installed within battery compartment 24 and is used to provide power to electrical components within electronic device 100. Specifically, these electrical components include, but are not limited to, display screen 12 (see...). Figure 2 It may be one or more of the following: camera module, motherboard, sub-board, speaker module, and fingerprint recognition module, without specific limitations.

[0105] The power management module is electrically connected between the battery 30 and the electrical device. The power management module receives input from the battery 30 and discharges to the electrical device to supply power. The power management module can also monitor parameters such as the battery 30's capacity, charge / discharge cycle count, and health status (leakage current, impedance).

[0106] The charging management module is electrically connected between the charger and the battery 30. The charging management module receives charging input from the charger. The charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module can receive charging input from the wired charger via a universal serial bus (USB) interface.

[0107] In some wireless charging embodiments, the charging management module can receive wireless charging input via the wireless charging coil of the electronic device. The power management module and the charging management module can be integrated into one unit or set up separately; no specific limitation is made here.

[0108] Please see Figure 3 and Figure 4 , Figure 3 A perspective view of the battery 30 provided in some embodiments of this application. Figure 4 for Figure 3 The exploded view of battery 30 is shown. Battery 30 includes battery cell 31 and protection board 33.

[0109] The battery can be a nickel-metal hydride battery, a lead-carbon battery, a zinc-air battery, a silver-zinc battery, a magnesium battery, etc. In this embodiment, battery 30 is used as an example for illustration. Lithium-ion batteries have a very high energy density, and can store more electrical energy for the same weight. Due to the low density of lithium, lithium-ion batteries are also lighter.

[0110] The term "energy density" as used in this application refers to the amount of energy stored per unit volume or unit mass. A higher energy density means that the battery can provide more energy for the same volume or mass. Energy density includes volumetric energy density and mass energy density. Volumetric energy density refers to the energy stored per cubic centimeter or per cubic millimeter, typically expressed in watt-hours per liter (Wh / L) or milliwatt-hours per cubic centimeter (mWh / cm³). 3 Mass energy density refers to the energy stored per kilogram or per gram, usually expressed in watt-hours per kilogram (Wh / kg) or milliwatt-hours per gram (mWh / g).

[0111] Please see Figure 5 , Figure 5 for Figure 4 The diagram shows an exploded view of the battery cell 31 within the battery 30. The battery cell 31 includes a bare cell 311 and a housing 320, with the bare cell 312 located within the housing 320. The bare cell 312 has at least two tabs T, where "at least two" means two or more. The at least two tabs T include a positive tab and a negative tab. One end of each tab T is electrically connected to the bare cell 312, and the other end of each tab T extends through the housing 320 to the outside of the housing 320.

[0112] Please return to the reference. Figure 4 The protection plate 33 is disposed outside the housing 320, and is electrically connected to the portion of the electrode T located outside the housing 320. The protection plate 33 has a charging / discharging port 01, which has a positive terminal and a negative terminal. The positive terminal is connected to the positive electrode tab, and the negative terminal is connected to the negative electrode tab. The charging / discharging port 01 is electrically connected to the aforementioned power management module, charging management module, and charger through the positive and negative terminals to realize charging / discharging management and detection of parameters such as capacity, cycle count, and health status.

[0113] Please see Figure 6 , Figure 6 for Figure 4The diagram shows a partial structural schematic of the battery cell 31 cut along line AA. The bare battery cell 311 stores electrical energy. It converts chemical energy into electrical energy through internal chemical reactions and releases this energy when needed. During discharge, the active materials in the bare battery cell 311 generate current through electrochemical reactions, providing electrical energy to external electrical appliances.

[0114] The bare cell 311 may include a positive electrode 311a, a negative electrode 311b, a separator (not shown in the figure), and an electrolyte 311d. These structures of the bare cell 311 together form the site of the electrochemical reaction. Figure 6 The illustrated embodiment uses one positive electrode 311a, one negative electrode 311b, one separator, and one electrolyte 311d as an example for illustration. In other embodiments, the number of positive electrode 311a, one negative electrode 311b, one separator, and one electrolyte 311d may be multiple.

[0115] The positive electrode 311a and the negative electrode 311b are stacked together, and a separator is disposed between the positive electrode 311a and the negative electrode 311b. The separator is used to isolate the positive electrode 311a and the negative electrode 311b, so as to prevent the positive electrode 311a and the negative electrode 311b from coming into contact and short-circuiting. The separator allows lithium ions to pass through, but is electronically insulating. This can maintain ion flow during charging and discharging, while preventing the direct passage of current.

[0116] The electrolyte 311d is used to conduct ions, thereby completing the transfer of charge inside the bare cell 311. Depending on the physical state of the active materials in the bare cell 311, the battery 30 may include a solid-state battery 30, a liquid battery 30, a semi-solid-state battery 30, a quasi-solid-state battery 30, etc. Figure 6 The embodiment shown takes a solid-state battery 30 as an example. When the battery 30 is a solid-state battery 30, the electrolyte 311d in the bare cell 311 can be directly used as the separator S.

[0117] Please see Figure 7 , Figure 7 for Figure 4 The diagram shows another structural design of cell 31 cut along line AA. Figure 7 The illustrated embodiment uses a liquid battery 30 as an example for explanation. The electrolyte 311d in the liquid battery 30 is in a liquid state, and the electrolyte 311e fills the cavity of the casing 320. The electrolyte 311e is a conductive liquid, which allows ions to move between the positive electrode 311a and the negative electrode 311b, while preventing the direct passage of electrons.

[0118] The electrolyte 311e can be a salt solution, an organic solvent, or an ionic liquid. During charging and discharging, ions shuttle through the diaphragm S via the electrolyte 311e, while electrons flow from the negative electrode to the positive electrode (during discharge) or from the positive electrode to the negative electrode (during charging) through the external circuit.

[0119] During the charging and discharging process, the battery 30 undergoes volume expansion, regardless of whether it is a solid-state battery or a liquid-state battery as described above. In particular, the expansion is more pronounced in the solid-state battery 30. The negative electrode 311b, whose material contains a high proportion of silicon (Si), also experiences significant volume changes during the charging and discharging process of the battery cell 31.

[0120] In the lithium-ion battery 30, silicon is typically added to the material of the negative electrode 311b. Because silicon has a high theoretical capacity and can store more lithium ions, a higher silicon content in the negative electrode 311b allows the battery 30 to achieve a higher energy storage capacity. Therefore, the lithium-ion battery 30 experiences significant volume expansion during charging and discharging.

[0121] For information on the chemical reactions of silicon in the material of the negative electrode 311b during the charging and discharging process of battery 30, please refer to [link to relevant documentation]. Figure 8 , Figure 8 This is a schematic diagram illustrating the changes in silicon material in the battery 30 during charging and discharging operations, provided in some embodiments of this application. Figure 8 The battery 30 shown in Figure (a) is in the uncharged state. The left side of the figure is a schematic diagram of the silicon (Si) crystal structure, and the right side is a schematic diagram of the silicon-lithium alloy (LixSi) structure formed after charging.

[0122] like Figure 8 Figure (a) shows a schematic diagram of the crystal structure of silicon (Si) before charging, as shown in Figure (a). Figure 8 Figure (b) shows a schematic diagram of the silicon-lithium alloy (Li_xSi) formed after the reaction of silicon and lithium following charging. During the charging process of battery 30, the silicon in battery 30 is transformed from... Figure 8 The change in (a) is as follows: Figure 8 In (b), lithium ions (Li) originate from the positive electrode. + Lithium ions are embedded into the silicon crystal. This process is called "alloying" or "intercalation." After entering the silicon crystal, lithium ions form an alloy with silicon atoms, known as lithium-silicon alloy (LixSi). Due to the intercalation of lithium ions, the silicon crystal undergoes significant volume expansion.

[0123] The chemical formula for the reaction during battery charging (30%) is as follows:

[0124] xLi + +Si+xe - →Lix Si

[0125] Here, X represents the number of lithium ions embedded.

[0126] During the discharge process of battery 30, the silicon in battery 30 changes from... Figure 8 The change in (b) is as follows Figure 8 In step (a), lithium ions embedded in the lithium silicon alloy are released and migrate back to the positive electrode 311a. This process is called "deintercalation". As lithium ions are deintercalated, the lithium silicon alloy returns to its original silicon crystal structure, and its volume shrinks accordingly.

[0127] The chemical formula for the reaction during battery discharge is as follows:

[0128] Li x Si→xLi + +Si+xe -

[0129] Here, X represents the number of lithium ions embedded.

[0130] In summary, during charging, the bare cell 311 of the battery 30 is prone to volume expansion. This expansion may cause deformation of the positive electrode 311a and negative electrode 311b, reducing the contact area between them and the electrolyte 311d, thus affecting ion transport efficiency. The expansion of the bare cell 311 may also cause displacement or damage to the separator S, resulting in poor physical contact between the positive electrode 311a and negative electrode 311b and causing a short circuit.

[0131] The volume expansion of the bare cell 311 will also increase the pressure inside the battery 30. If the casing 320 cannot effectively restrain this pressure, it may cause damage to the battery 30 structure, which will in turn create gaps between the positive electrode 311a, the negative electrode 311b and the electrolyte 311d, and will also affect the contact between the positive electrode 311a, the negative electrode 311b and the electrolyte 311d.

[0132] The severe volume expansion of the bare cell 311 may also cause the active material on the positive electrode 311a and negative electrode 311b to fall off. The fallen active material may block the ion transport channels, further affecting the contact between the positive electrode 311a, negative electrode 311b and electrolyte 311d.

[0133] Therefore, in order to maintain good interfacial contact between the positive electrode 311a, the negative electrode 311b, and the electrolyte 311d inside the battery 30, the casing 320 should provide stable constraint for the bare cell 311. However, the casing 320 is usually limited by its own material and structural characteristics, and cannot provide sufficient constraint for the bare cell 311.

[0134] To enhance the constraint effect of the casing 320 on the bare cell 311, this application also provides a battery 30, please refer to [reference needed]. Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure of the battery 30 provided in some embodiments of this application; Figure 10 for Figure 9 The diagram shows the structure of battery 30 cut along line BB.

[0135] The battery 30 includes a bare cell 311, a casing 320, and a pressure-applying structure 40. The structure of the bare cell 311, the structure of the casing 320, and the connection relationship between the bare cell 311 and the casing 320 can be referred to the above content.

[0136] Based on the above embodiments, the battery 30 in this application embodiment further includes a pressure-applying structure 40, which includes a first pressure plate 41, a second pressure plate 42, and a connector 43. Specifically, the first pressure plate 41 is disposed on the first outer surface 321 of the housing 320, and the second pressure plate 42 is disposed on the second outer surface 322 of the housing 320. The first outer surface 321 and the second outer surface 322 are arranged along a first direction. The first direction can be the stacking direction of the positive electrode 311a and the negative electrode 311b in the bare cell 311, or it can be understood as the thickness direction of the bare cell 311, that is... Figure 9 and Figure 10 The Z-axis direction in the equation.

[0137] The connector 43 is used to fix the first pressure plate 41 and the second pressure plate 42. For example, the connector 43 includes a plurality of connecting rods 431 and a locking member 432. The plurality of connecting rods 431 are disposed between the first pressure plate 41 and the second pressure plate 42, and the plurality of connecting rods 431 are evenly distributed on the outer periphery of the housing 320. Figure 9 and Figure 10 The illustrated embodiment is given with four connecting rods 431 as an example.

[0138] Locking member 432 is used to connect connecting rod 431 to first pressure plate 41 and second pressure plate 42. There are multiple locking members 432, and the number of locking members 432 is the same as the number of connecting rods 431 and corresponds one-to-one. For example, locking member 432 can be a threaded connector 43, adhesive material, snap-fit ​​structure, etc. In some embodiments, locking member 432 is a threaded connector 43, which can be a bolt, screw, threaded post, etc. This application embodiment uses a bolt as an example for illustration.

[0139] At least one of the first pressure plate 41 and the second pressure plate 42 is provided with a first through hole. For example, the first pressure plate 41 is provided with a first through hole, and at least a portion of the connecting rod 431 is located on the side of the first pressure plate 41 opposite to the second pressure plate 42. The portion of the connecting rod 431 located on the first pressure plate 41 opposite to the second pressure plate 42 has a threaded connection portion, which is threadedly connected to the locking member 432. The locking member 432 is fixedly connected to the connecting rod 431 to apply pressure to the first pressure plate 41 from the side of the first pressure plate 41 pointing towards the housing 320.

[0140] During the charging and discharging process of the battery 30, when the bare cell 311 expands in volume, the casing 320 forms a first constraint on the bare cell 311, and the first pressure plate 41 forms a second constraint on the casing 320.

[0141] In this way, the battery 30 in this embodiment can mechanically constrain the bare cell 311 through the pressure structure 40 and the casing 320, thereby avoiding the problem of poor contact between active materials caused by volume expansion during the charging and discharging process of the battery 30. This ensures good interfacial contact between the positive electrode 311a, the negative electrode 311b and the electrolyte 311d of the battery 30, so that the battery 30 maintains a stable and effective lithium-ion transport channel and improves the working stability of the battery 30.

[0142] However, the battery 30 structure in the above embodiments has several drawbacks. First, the battery 30 in the above embodiments has a complex structure and the pressure-applying structure 40 has a large volume. Given a fixed volume of battery 30, the pressure-applying structure 40 occupies a larger volume, which reduces the volume of the bare battery cell 311 used to store electrical energy in battery 30, thereby affecting the energy density of battery 30.

[0143] Furthermore, the pressure-applying structure 40 is disposed on the outer surface of the housing 320, and the shape of the pressure-applying structure 40 is irregular, making it impossible for the overall structure of the battery 30 to present a regular shape. Therefore, the battery 30 in the above embodiment is also difficult to integrate into the above-mentioned electronic device 100.

[0144] Secondly, from the perspective of battery 30 installation, the consistency of pressure applied by the pressure-applying structure 40 to the housing 320 is poor due to the assembly precision between the pressure-applying structure 40 and the housing 320. Factors contributing to this poor consistency include, but are not limited to, the following: first, the tightening degree between the multiple locking components 432 and the multiple connecting rods 431 is difficult to maintain; second, the connection sequence between the multiple locking components 432 and the multiple connecting rods 431 is sequential.

[0145] Furthermore, after long-term use of the pressure structure 40, the first pressure plate 41 and the second pressure plate 42 are prone to structural fatigue. For example, the first pressure plate 41 and the second pressure plate 42 may deform, bend, or crack, especially in the area where the stress concentration is relative to the first pressure plate 41 and the bare cell 311, and in the area where the stress concentration is relative to the second pressure plate 42 and the bare cell 311.

[0146] To limit the volume expansion of the bare cell 311, the thicknesses of the first pressure plate 41 and the second pressure plate 42 are typically required to be relatively large, which can lead to a decrease in the energy density of the battery 30. During charge-discharge cycles, the battery 30 undergoes repeated expansion and contraction, further causing localized material fatigue in the first pressure plate 41 and the second pressure plate 42.

[0147] Therefore, in order to solve the above problems and improve the working performance of the battery 30, when the bare cell 311 expands during the charging and discharging process, the casing 312 needs to provide more uniform pressure to the bare cell 311 to avoid stress concentration on a part of the casing 312 when the bare cell 311 expands, which would lead to material fatigue of the casing 312. This improves the reliability and stability of the pressure applied by the casing 312 to the bare cell 311.

[0148] Please see Figure 11 , Figure 11 This is a cross-sectional structural schematic diagram of the battery 30 provided in some embodiments of this application. Some embodiments of this application also provide a battery 30 designed to improve the stability of the casing 312 of the battery 30, thereby enhancing the constraint effect of the casing 312 on the bare battery cell 311.

[0149] The battery 30 includes a casing 312 and bare cells 311. The casing 312 is used to protect and seal the bare cells 311. The casing 312 can be square, flat, cylindrical, elliptical, or other irregular shapes, such as "L", "n", or "T" shapes. The appearance of the casing 312 is designed according to its application scenario. This application embodiment uses a square block casing 312 as an example for illustration.

[0150] The material of the casing 312 may include at least one of aluminum, steel, polymer materials, stainless steel, titanium, aluminum alloy, titanium alloy, and magnesium alloy. The material of the casing 312 may also be a composite material, which may include at least one of carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic (GFRP), and aramid fiber. This application embodiment uses a steel casing as an example for illustration. Steel has high hardness and strength, which can effectively protect the internal structure of the battery 30.

[0151] The housing 312 has a first wall panel 312b and a second wall panel 312c arranged at intervals, and a side wall panel 312d connecting the first wall panel 312b and the second wall panel 312c. The first wall panel 312b, the second wall panel 312c, and the side wall panel 312d form a sealed cavity 312a. The sealed cavity 312a is a closed space, and the housing 312 can prevent moisture, dust, microparticles, etc. from the external environment from entering the sealed cavity 312a, thereby maintaining the stability of the internal environment. The sealed cavity 312a can be sealed by a sealing element, such as a rubber gasket, sealant, etc.

[0152] The bare battery cell 311 is disposed within the sealed cavity 312a. The bare battery cell 311 is used to store and release electrical energy. The bare battery cell 311 converts chemical energy into electrical energy through a chemical reaction and releases electrical energy during the discharge process. The specific structure of the bare battery cell 311 is the same as that of the bare battery cell 311 in the above embodiment, and will not be described again here.

[0153] The bare cell 311 includes at least one first through hole H1, and a first support member 313 is provided in the first through hole H1. The two ends of the first support member 313 are respectively connected to the first wall plate 312b and the second wall plate 312c to prevent the first wall plate 312b and the second wall plate 312c from moving away from each other. The first support member 313 can keep the first wall plate 312b and the second wall plate 312c in their original state, thereby enhancing the effect of the first wall plate 312b and the second wall plate 312c in constraining and limiting the expansion of the cell.

[0154] In detail, when the bare cell 311 expands during charging and discharging, the casing 312 can restrict and constrain the expansion of the bare cell 311. The first wall plate 312b and the second wall plate 312c are arranged at intervals such that the first wall plate 312b and the second wall plate 312c are located on opposite sides of different surfaces of the bare cell 311. For example, the first wall plate 312b and the second wall plate 312c are located on opposite sides of the bare cell 311 along a first direction. The first direction can be the stacking direction of the positive electrode 311a and the negative electrode 311b in the bare cell 311, that is... Figure 11 The Z-axis direction in the equation.

[0155] In some embodiments, the first wall panel 312b and the second wall panel 312c are bonded to the surface of the bare battery cell 311; in other embodiments, the first wall panel 312b and the second wall panel 312c may have a small gap with the surface of the bare battery cell 311. This application embodiment uses the bonding of the first wall panel 312b and the second wall panel 312c to the surface of the bare battery cell 311 as an example for illustration.

[0156] When the bare cell 311 has an expansion tendency along the first direction, the expansion of the bare cell 311 exerts a force on the first wall plate 312b and the second wall plate 312c, causing them to move away from each other. That is, the bare cell 311 exerts a force F11 on the first wall plate 312b and a force F12 on the second wall plate 312c.

[0157] Due to its structural strength, the first wall panel 312b and the second wall panel 312c of the housing 312 possess resistance forces F21 and F22 to maintain their original position and shape. Therefore, the first wall panel 312b and the second wall panel 312c restrict and constrain the bare cell 311 to prevent it from continuing to expand.

[0158] In other words, the higher the structural strength of the housing 312, the more significant the constraint effect of the first wall plate 312b and the second wall plate 312c on the bare cell 311, thus more effectively restraining the deformation of the bare cell 311. Therefore, the first wall plate 312b and the second wall plate 312c can be connected by other structures of the housing 312 itself. For example, the first wall plate 312b and the second wall plate 312c can be connected by the side wall plate 312d, or the first wall plate 312b and the second wall plate 312c can be connected by the first support member 313.

[0159] In this way, the first support member 313 is located between the first wall plate 312b and the second wall plate 312c. The first support member 313 can prevent the first wall plate 312b and the second wall plate 312c from moving away from each other under the squeezing force generated by the bare cell 311. When the bare cell 311 expands, the first support member 313 can apply a force F31 to the first wall plate 312b and a force F32 to the second wall plate 312c, thereby strengthening the constraint effect of the first wall plate 312b and the second wall plate 312c on the bare cell 311. This can effectively avoid the problem of poor contact of internal active materials caused by the expansion of the bare cell 311, and ensure that the battery 30 maintains good performance.

[0160] Secondly, the first wall panel 312b and the second wall panel 312c are connected by a first support member 313. The compressive force between the first wall panel 312b and the second wall panel 312c can be distributed to the first support member 313, which is conducive to the uniform force distribution between the first wall panel 312b and the second wall panel 312c. In other words, the force distribution between the first wall panel 312b and the bare cell 311, and between the second wall panel 312c and the bare cell 311 is more uniform, avoiding the problem of stress concentration between the first wall panel 312b, the second wall panel 312c and the bare cell 311.

[0161] The first wall plate 312b and the second wall plate 312c form a uniform constraint force on the bare cell 311. The uniform constraint force can ensure that the positive electrode 311a, the negative electrode 311b and the electrolyte 311d inside the bare cell 311 maintain good contact, reduce the problem of high internal resistance caused by poor electrode contact, and improve the charging and discharging efficiency and energy density of the battery 30.

[0162] Furthermore, when the battery 30 experiences external stress impacts, such as drops, collisions, or compression, the first support member 313 can also provide support and buffering, maintaining the original state of the first wall plate 312b and the second wall plate 312c. The first support member 313 can absorb some of the energy from the external stress impacts, thereby reducing the energy transmitted from the external stress to the surface of the bare cell 311. Therefore, the first support member 313 can also reduce the damage to the bare cell 311 caused by external stress impacts.

[0163] In addition, the battery 30 enhances the structural strength of the housing 312 itself through the first support member 313. The first support member 313 is located inside the housing 312. Compared with the battery 30 in the above embodiment, the battery 30 in this embodiment will not affect the external structure of the battery 30. The external structure of the battery 30 can maintain its original shape, such as the battery 30 being a regular square block, flat, etc.

[0164] The battery 30 has a compact overall structure, which avoids the battery 30 occupying too much space, thereby improving the space utilization of the electronic device 100. In addition, the external structural shape of the battery 30, that is, the shape of the housing 312, is conducive to the installation of the battery 30 in the battery compartment 24, avoiding the influence of external structures on the installation of the battery 30.

[0165] The following is a detailed explanation of the bare battery cell 311.

[0166] The bare cell 311 is used to store and release electrical energy. The bare cell 311 converts chemical energy into electrical energy through a chemical reaction and releases electrical energy during the discharge process. The basic structure of the bare cell 311 is the same as the specific structure of the bare cell 311 in the above embodiment, and will not be described again here.

[0167] Please continue reading. Figure 11 The bare battery cell 311 includes at least one first through-hole H1, and a first support member 313 is provided within the first through-hole H1. That is, the number of first support members 313 is the same as the number of first through-holes H1, and they correspond one-to-one. The axis of one of the first through-holes H1 passes through the geometric center of the bare battery cell 311. The geometric center refers to the center point of an object in a geometric sense. For some regular geometric shapes, the position of the geometric center can be determined according to the symmetry of its shape.

[0168] For example, when the structure of the bare cell 311 is a cuboid (rectangular cube), the geometric center of the bare cell 311 is located at the center point of the cuboid, that is, the intersection of the midpoints of the three mutually perpendicular sides of the bare cell 311. This intersection is determined by the midpoints of the length, width and height of the bare cell 311.

[0169] For another example, when the structure of the bare cell 311 is a cube, the geometric center of the bare cell 311 is located at the center point of the cube, that is, the intersection of the midpoints of the three mutually perpendicular sides, which is also the intersection of the body diagonals of the cube.

[0170] As another example, when the bare cell 311 has a cylindrical structure, the geometric center of the bare cell 311 is located on the axis of the cylinder and at the midpoint of the cylinder's height.

[0171] For another example, when the structure of the bare cell 311 is an ellipsoid, the geometric center of the bare cell 311 is located at the intersection of the three principal axes (major axis, median axis and minor axis) of the ellipsoid, which is the center of the ellipsoid.

[0172] Therefore, the bare cells 311 have different structural shapes, and their geometric centers are located at different positions. In this way, the first support member 313 is positioned at the geometric center of the cell, effectively and evenly distributing and supporting the stress between the first wall plate 312b and the bare cell 311, and between the second wall plate 312c and the bare cell 311, thereby improving the overall stability and rigidity of the housing 312.

[0173] Furthermore, the increased structural strength of the casing 312 enhances the constraint and limitation effect of the first wall plate 312b and the second wall plate 312c on the expansion of the bare cell 311, thereby extending the service life of the bare cell 311. This effectively avoids problems caused by poor contact of internal active materials due to cell expansion, ensuring that the battery 30 maintains good performance.

[0174] Please continue reading. Figure 11In some embodiments, the bare cell 311 includes only one first through hole H1, the axis of which passes through the geometric center of the bare cell 311, and the number of first support members 313 is also one.

[0175] In this way, the first support member 313 is disposed within the first through hole H1, and its two ends are connected to the first wall plate 312b and the second wall plate 312c respectively. This enhances the constraint and limitation effect of the first wall plate 312b and the second wall plate 312c on the expansion of the bare cell 311, and also ensures that the first through hole H1 does not occupy too much volume of the bare cell 311, thereby ensuring the energy density of the bare cell 311. Therefore, the first support member 313 can balance the structural strength of the housing 312 and the energy density of the bare cell 311.

[0176] Please see Figure 12 and Figure 13 , Figure 12 A cross-sectional structural schematic diagram of the battery 30 provided in some embodiments of this application; Figure 13 for Figure 12 The image shows a top view of the bare cell 311 in the battery 30. In some other embodiments, when the volume of the bare cell 311 is large, the volume used to house the bare cell 311 is also large. The bare cell 311 may include multiple first through holes H1, and the number of first support members 313 is also multiple. The axis of one of the first through holes H1 passes through the geometric center of the bare cell 311, and the remaining first through holes H1 may be evenly arranged relative to the assembly center of the bare cell 311.

[0177] For example, multiple first through holes H1 are distributed in a ring or rectangular array relative to the geometric center of the bare cell 311; for another example, multiple first through holes H1 are arranged at equal intervals relative to the geometric center of the bare cell 311, for example, multiple first through holes H1 are arranged at equal intervals along one or more straight lines; for yet another example, multiple first through holes H1 are evenly distributed radially outward relative to several centers of the bare cell 311, for example, the arrangement of petals around a stamen.

[0178] In this way, the multiple first support members 313 are evenly distributed relative to the geometric center of the bare cell 311. These multiple first support members 313 can evenly disperse the compressive force generated by the expansion of the bare cell 311, reducing the problem of localized pressure concentration between the first wall plate 312b and the second wall plate 312c, thereby reducing the risk of deformation or damage to the housing 312. The multiple first support members 313 can improve the overall structural stability of the housing 312 and prevent structural deformation caused by the expansion of the bare cell 311.

[0179] Furthermore, the multiple first support members 313 can uniformly constrain and limit the expansion of the bare cell 311, and the first wall plate 312b and the second wall plate 312c can effectively limit the deformation of the bare cell 311 during the charging and discharging process, which is beneficial to maintaining the overall shape and size of the bare cell 311 and extending the service life of the bare cell 311.

[0180] The relative positions of the bare cell 311 to the first wall plate 312b and the second wall plate 312c vary depending on the type of bare cell 311. Based on the layout and assembly method of the positive electrode 311a, negative electrode 311b, and electrolyte 311d in the bare cell 311, the type of bare cell 311 can include stacked cells and wound cells. Based on the different physical states of the electrolyte 311d, the type of bare cell 311 includes solid-state cells and liquid-state cells.

[0181] The following section will elaborate on the types of bare cells 311 and the relative positional relationships between different types of bare cells 311 and the first wall plate 312b and the second wall plate 312c.

[0182] Please refer to the following: Figure 14 , Figure 15 and Figure 16 , Figure 14 This application provides schematic diagrams of the structure of a battery cell for some of its embodiments. Figure 15 for Figure 14 A schematic diagram of the structure of bare cell 311 in the battery cell shown; Figure 16 for Figure 15 The diagram shows a cross-section of the bare cell 311 along the DD line.

[0183] In some embodiments, the battery 30 is a stacked battery, and the bare cell 311 includes a positive electrode 311a and a negative electrode 311b that are alternately arranged and stacked together, and a separator S is provided between adjacent positive electrode 311a and negative electrode 311b.

[0184] The positive electrode 311a includes a positive current collector P11 and a positive electrode material P12. The positive electrode material P12 can be disposed on one surface of the positive current collector P11 or on two opposite surfaces of the positive current collector P11. Figure 16 The example given is only one surface of the positive electrode material P12 disposed on the positive electrode current collector P11, which should not be considered as a special limitation of this application.

[0185] The negative electrode 311b includes a negative current collector P21 and a negative electrode material P22. The negative electrode material P22 can be disposed on one surface of the negative current collector P21 or on two opposite surfaces of the negative current collector P21. Figure 16The example given is only an example of negative electrode material P22 being disposed on one surface of negative electrode current collector P21, which should not be considered as a special limitation of this application.

[0186] The first tab T1 is used to draw the current from the positive electrode 311a. Specifically, the tab structure T11 is electrically connected to the positive current collector P11 of multiple positive electrode 311a. The tab structure T11 can be fixed to the positive current collector P11 by welding, pressing, or other methods, or it can be formed by directly extending from the positive current collector P11. One end of the first tab T1 is electrically connected to the bare battery cell 311, and the other end passes through the second housing 312 and extends out of the first housing 312 to the outside of the sealed cavity 312a to form a charging port.

[0187] The second tab T2 is used to draw the current from the negative electrode 311b. Specifically, a tab structure T11 is electrically connected to the negative current collector P21 of the multiple negative electrode 311b. The tab structure T11 can be fixed to the negative current collector P21 by welding, pressing, or other methods, or it can be formed by directly extending from the negative current collector P21. One end of the second tab T2 is electrically connected to the bare battery cell 311, and the other end passes through the second housing 312 and the first housing 312, extending out of the sealed cavity 312a to form a charging port.

[0188] Figure 16 The example given is simply that the tab structure T11 is formed by direct extension of the positive current collector P11 and the negative current collector P21. This should not be considered as a special limitation imposed on this application.

[0189] The electrode mentioned above includes a current collector and a polar material disposed on the surface of the current collector. The polar material is the material that participates in the charge-discharge reaction, and the current collector is used to collect current. For the positive electrode, the current collector is formed of aluminum (chemical formula: Al).

[0190] For the negative electrode, the current collector is formed of copper (chemical formula: Cu). Additionally, the separator S is formed of a polyolefin porous membrane. Along the extension direction of the membrane's winding axis, both ends of the separator S extend beyond the edges of the electrode, thereby providing insulation protection for the edges of the electrode along the extension direction of the membrane's winding axis.

[0191] The arrangement direction of the positive electrode 311a and negative electrode 311b in the bare cell 311 is defined as the first direction, which is the Z-axis direction in the figure. During the charging and discharging process of the battery 30, lithium ions are inserted and extracted between the positive and negative electrode materials P22. The process of lithium ion insertion and extraction will cause the volume of the electrode material to expand.

[0192] Please continue reading. Figure 15The bare cell 311 includes a first surface M1 and a second surface M2 arranged along a first direction, and a side surface M3 connecting the first surface M1 and the second surface M2. The stacked battery consists of multiple layers of positive electrode 311a, negative electrode 311b and electrolyte 311d, which are stacked in parallel along the first direction.

[0193] In this way, when each layer of electrode material expands, the expansion of each layer of electrode material is superimposed along the first direction, causing the overall volume of the bare cell 311 to expand significantly along the first direction. This leads to stress concentration on the first surface M1 and the second surface M2. However, the expansion deformation of the surface of the bare cell 311 perpendicular to the first direction (i.e., the side surface M3) can be evenly distributed on each layer of electrode, and the expansion deformation of each layer of electrode does not superimpose, thus reducing the stress on the side surface M3.

[0194] When the bare cell 311 is in an expanded state, the surfaces of the bare cell 311 arranged along the first direction (i.e., the first surface M1 and the second surface M2) are areas with higher stress, while the side surface M3 of the bare cell 311 arranged perpendicular to the first direction is an area with lower stress.

[0195] Therefore, the first wall panel 312b is located on the side facing the first surface M1 and is in contact with the first surface M1. The second wall panel 312c is located on the side facing the second surface M2 and is in contact with the first surface M1. Furthermore, the axial direction of the first through hole H1 is parallel to the first direction, that is, the longitudinal direction of the first support member 313 is parallel to the first direction.

[0196] In this way, the position and direction of the first support member 313 correspond to the position where the bare cell 311 deforms the most. The first support member 313 can increase the structural strength of the housing 312 in resisting stress along the first direction. In turn, the first support member 313 can prevent the first wall plate 312b and the second wall plate 312c from moving away from each other under the expansion and compression of the bare cell 311.

[0197] Because the expansion stress of the side surface M3 of the bare cell 311 perpendicular to the first direction is less than the expansion stress of the surface of the bare cell 311 along the first direction. In some embodiments, the side wall plate 312d is connected between the first wall plate 312b and the second wall plate 312c, and the bare cell 311 and the inner wall of the side wall plate 312d are spaced apart.

[0198] In this way, the sidewall plate 312d is located on the side of the bare cell 311 with less deformation, allowing the bare cell 311 to release some expansion through the gap on the sidewall plate 312d, reducing local stress concentration on the side M3 of the bare cell 311. The first wall plate 312b, the second wall plate 312c, and the sidewall plate 312d work together to constrain and regulate the expansion of the bare cell 311, ensuring good contact between the active materials inside the bare cell 311, thereby improving the performance of the battery 30.

[0199] The above explanation uses battery 30 as an example of a stacked cell; the following explanation uses battery 30 as an example of a wound cell. Please refer to [link / reference]. Figure 17 and Figure 18 , Figure 17 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 18 for Figure 17 The diagram shows the structure of bare cell 311 in the battery cell.

[0200] In some embodiments, when the bare cell 311 is a wound bare cell 311, the shape of the bare cell 311 may include, but is not limited to, a cuboid, a cylinder, and a frustum. In this embodiment, the bare cell 311 is wound and is formed by winding multiple layers of films. Specifically, the multiple layers of films include a positive electrode 311a, a separator S, and a negative electrode 311b stacked sequentially. The separator S can separate adjacent positive electrode 311a and negative electrode 311b, playing an insulating role and preventing short circuits between the two electrodes.

[0201] After being stacked, the multilayer film is wound around a first axis. The bare cell 311 has side surfaces M3 arranged along the first axis. The side surfaces M3 include a first side surface M3 and a second side surface M3, as well as a peripheral surface surrounding the side surfaces M3. The peripheral surface may include a first surface M1 and a second surface M2, as well as a first outer peripheral surface M4 and a second outer peripheral surface M5 connecting the first surface M1 and the second surface M2.

[0202] The expansion and deformation of the wound battery cell mainly occurs along its radial direction, that is, from the center of the cell outward, which is the stacking direction of the diaphragm. Since the active material inside the cell undergoes volume changes during charging and discharging, when each layer of electrode material expands, the expansion of each layer of electrode material is superimposed along the stacking direction, which will cause the overall volume of the bare battery cell 311 to expand significantly along the stacking direction. This will lead to stress concentration problems on the peripheral surface of the bare battery cell 311.

[0203] The wound cell will also expand to a certain extent in the axial direction (i.e., the direction of the first axis). However, the expansion deformation of the surface of the bare cell 311 perpendicular to the stacking direction can be evenly distributed on each electrode layer, and the expansion deformation of each electrode layer will not be superimposed, so the stress on the side M3 is smaller.

[0204] Therefore, for wound battery cells, the stress on the circumferential surface of the bare battery cell 311 is greater than that on the sides M3 of the bare battery cell 311 along its own axial direction. The axial direction of the first through hole H1 can be any direction perpendicular to the first axis. The first wall plate 312b and the second wall plate 312c are spaced apart along the axial direction of the first through hole H1. For example, the first wall plate 312b is located on the side facing the first surface M1 and is in contact with the first surface M1, and the second wall plate 312c is located on the side facing the second surface M2 and is in contact with the second surface M2.

[0205] For another example, the first wall panel 312b is located on the side facing the first outer peripheral surface M4 and is in contact with the first outer peripheral surface M4, and the second wall panel 312c is located on the side facing the second outer peripheral surface M5 and is in contact with the second outer peripheral surface M5.

[0206] For another example, there are two first wall panels 312b and two second wall panels 312c. One first wall panel 312b is located on the side facing the first surface M1 and is in contact with the first surface M1. The other first wall panel 312b is located on the side facing the first outer peripheral surface M4 and is in contact with the first outer peripheral surface M4. One second wall panel 312c is located on the side facing the second surface M2 and is in contact with the second surface M2. The other second wall panel 312c is located on the side facing the second outer peripheral surface M5 and is in contact with the second outer peripheral surface M5.

[0207] in, Figure 17 and Figure 18 The embodiment shown is illustrated using the example of two first wall panels 312b and two second wall panels 312c.

[0208] In this way, the position and direction of the first support member 313 correspond to the position where the bare cell 311 deforms the most. The first support member 313 can increase the structural strength of the shell 312 to resist stress. In this way, the first support member 313 can prevent the first wall plate 312b and the second wall plate 312c from moving away from each other under the expansion and compression of the bare cell 311.

[0209] Because the expansion stress on the circumferential surface of the bare cell 311 perpendicular to the first axis is greater than the expansion stress on the side surface M3 of the bare cell 311 arranged along the first axis. In some embodiments, the side wall plate 312d is connected between the first wall plate 312b and the second wall plate 312c, and is located on the side facing the side surface M3. The inner walls of the bare cell 311 and the side wall plate 312d can be spaced apart.

[0210] In this way, the sidewall plate 312d is located on the side of the bare cell 311 with less deformation, allowing the bare cell 311 to release some expansion through the gap on the sidewall plate 312d, reducing local stress concentration on the side M3 of the bare cell 311. The first wall plate 312b, the second wall plate 312c, and the sidewall plate 312d work together to constrain and regulate the expansion of the bare cell 311, ensuring good contact between the active materials inside the bare cell 311, thereby improving the performance of the battery 30.

[0211] The following explanation will continue using battery 30 as an example of a stacked cell battery.

[0212] If the first support member 313 is electrically conductive with the bare cell 311, it will affect the performance of the bare cell 311 and the structural stability of the first support member 313. For example, when the first support member 313 is made of metal, it may react with the positive and negative electrode materials P22 of the bare cell 311, leading to increased self-discharge. Increased self-discharge will shorten the storage life of the battery 30 and reduce its capacity retention rate. Furthermore, electrical conductivity between the first support member 313 and the bare cell 311 will also affect the structural strength of the first support member 313 itself.

[0213] Therefore, the first support member 313 and the bare battery cell 311 need to maintain an electrical insulation state, that is, there should be no conductive path between the first support member 313 and the bare battery cell 311. The insulation state between the first support member 313 and the bare battery cell 311 can be achieved in the following way:

[0214] In some embodiments, the first support member 313 is made of an insulating material. For example, the material of the first support member 313 can be rigid plastic, ceramic, fiber composite material, glass fiber composite material, carbon fiber composite material, rubber, etc. The first support member 313 and the bare battery cell 311 can be spaced apart, that is, there is a gap between the first support member 313 and the inner wall of the first through hole H1, and the first support member 313 and the bare battery cell 311 can also be in contact.

[0215] In this way, the bare cell 311 will not corrode the first support member 313, and the first support member 313 will not affect the working performance of the bare cell 311. The distance between the first support member 313 and the bare cell 311 is not limited, and their relative positions can be more flexible. Furthermore, when the distance between the first support member 313 and the bare cell 311 is small, or even when they can directly contact each other, the size of the first through hole H1 can be set smaller, thereby increasing the physical volume of the bare cell 311 and improving its energy density.

[0216] Please see Figure 19 , Figure 19 This is a cross-sectional structural diagram of the battery 30 provided in some embodiments of this application. In other embodiments, a portion of the first support member 313 may be made of conductive material, and another portion of the first support member 313 may be made of insulating material. Specifically, the first support member 313 may include a support portion 313a and an insulating layer 313b. The support portion 313a is connected between the first wall panel 312b and the second wall panel 312c, and the insulating layer 313b covers the outer peripheral surface of the support portion 313a.

[0217] The support portion 313a is made of a conductive material. For example, the support portion 313a can be a metal material with high structural strength, such as steel, aluminum, titanium, etc. The insulating layer 313b is made of an insulating material. For example, the insulating layer 313b can be polyimide (PI), polyester (PET), polyethylene (PE), polypropylene (PP), etc.

[0218] In this way, the support portion 313a can be made of a material with high structural strength, which can improve the overall structural strength of the first support member 313 under the premise that the volume of the first support member 313 is fixed. Under the premise that the structural strength of the first support member 313 is fixed, the support portion 313a can reduce the volume of the first support member 313, and the volume of the first through hole H1 used to accommodate the first support member 313 can also be set to be smaller, thereby increasing the physical volume of the bare cell 311 and improving the energy density of the bare cell 311.

[0219] The insulating layer 313b provides insulation and covers the outer surface of the support portion 313a, thus maintaining insulation between the first support member 313 and the bare cell 311. Therefore, the first support member 313 can balance structural strength and insulation, thereby ensuring the structural stability and charge / discharge performance of the battery 30.

[0220] In some other embodiments, the first support member 313 may be made of only conductive material, and there is a gap between the first support member 313 and the bare cell 311, that is, there is a gap space between the first support member 313 and the inner wall of the first through hole H1. For example, when the battery 30 is a solid-state battery 30, that is, the electrolyte 311d in the bare cell 311 is solid.

[0221] In this way, the first support member 313 and the bare battery cell 311 are insulated from each other by the spacing. The first support member 313 can be made of only conductive material. The structure of the first support member 313 is simple and has high structural strength, which is conducive to improving the processing efficiency of the first support member 313.

[0222] Please refer to the following: Figure 20 and Figure 21 , Figure 20 A cross-sectional structural schematic diagram of the battery 30 provided in some embodiments of this application; Figure 21 for Figure 20 The battery 30 is shown in a top view of the hidden housing 312. In some other embodiments, the battery 30 further includes a cylindrical insulating sealing portion 34, which is located in the first through hole H1 and is sealed between the first wall plate 312b and the second wall plate 312c, and the first support member 313 is disposed inside the insulating sealing portion 34.

[0223] The first support member 313 is insulated from the bare cell 311 by means of the insulating seal 34. In particular, when the battery 30 is a liquid battery 30, the electrolyte 311d in the bare cell 311 is liquid, i.e., electrolyte 311e. Contact between the electrolyte 311d and the first support member 313 may cause a corrosion reaction, especially when the electrolyte 311d is acidic or alkaline. Corrosion can damage the first support member 313, thereby affecting the overall structural stability of the battery 30. In addition, the corrosion products may contaminate the electrolyte 311d, further affecting the performance of the battery 30.

[0224] Therefore, the insulating sealing part 34 can play the role of water and insulation, which can not only ensure that the first support 313 maintains its original structural strength, but also prevent the first support 313 from affecting the performance of the bare cell 311.

[0225] Furthermore, the first support member 313 and the insulating sealing part 34 are spaced apart. This ensures that when the bare cell 311 expands, and when the first support member 313 deforms to prevent the first wall panel 312b and the second wall panel 312c from moving away from each other, there is a gap between the first support member 313 and the insulating sealing part 34. This prevents contact or collision between the first support member 313 and the insulating sealing part 34, thus avoiding damage caused by collision. This allows the first support member 313 to effectively fix the first wall panel 312b and the second wall panel 312c.

[0226] The specific structure of the first support member 313 will be described in detail below.

[0227] Please continue reading. Figure 20 In some embodiments, the first support member 313 can be a rigid member, which is a component whose shape and size hardly change when subjected to external forces.

[0228] In this way, the rigid support effectively prevents the first wall plate 312b and the second wall plate 312c from moving away from each other when subjected to external forces or internal pressure, maintaining the stability of the overall structure of the battery 30. The rigid support resists deformation, thus protecting the internal components of the battery 30. The rigid support helps maintain the relative positions of the internal components of the battery 30, improving assembly accuracy and the overall performance of the battery 30. The rigid support also increases the overall strength of the housing 312, enabling it to withstand greater external forces.

[0229] Please see Figure 22 , Figure 22 This is a cross-sectional structural diagram of the battery 30 provided in some embodiments of this application. In other embodiments, the first support member 313 may be an elastic member. Figure 22 The illustrated embodiment uses a spring as an example of an elastic element. An elastic element is a structure that undergoes reversible deformation when subjected to an external force. When the external force is removed, the elastic element can return to its original shape and size. This deformation follows Hooke's Law, which states that within the elastic limit, the deformation of a material is proportional to the force applied.

[0230] In this way, the elastic support can provide a certain degree of cushioning when subjected to external forces or internal pressures, reducing the impact on sensitive components inside the battery 30. The elastic component can adapt to certain dimensional changes, such as the stress generated by volume changes during the charging and discharging of the battery 30. The elastic support can absorb and disperse vibration energy, reducing vibration damage to the battery 30 during transportation and use. In cases where minor displacement of internal components may occur, the elastic support helps maintain good contact between the electrodes and other components.

[0231] For example, the elastic element includes at least one of sponge, rubber, silicone, spring, disc spring, and torsion spring. This results in a variety of support types, with different types of elastic elements having different elastic moduli and deformation ranges. Appropriate elastic elements can be selected based on the specific application and expected operating conditions of the battery 30 to better accommodate volume changes in the battery 30 during cyclic use.

[0232] The elastic element is used to apply a force from the first wall plate 312b to the second wall plate 312c, and the elastic element is also used to apply a force from the second wall plate 312c to the first wall plate 312b. Depending on whether the deformation state of the elastic element is a tensile state or a compressive state, the elastic element can be configured in the following ways.

[0233] In some embodiments, the elastic member includes a first end and a second end arranged along a first direction. The first end is connected to the first wall plate 312b, and the second end is connected to the second wall plate 312c. The elastic member is in a stretched state. That is, both ends of the elastic member are directly connected to the first wall plate 312b and the second wall plate 312c.

[0234] This simplifies the connection between the elastic element and the first wall panel 312b and the second wall panel 312c, facilitating installation and improving the assembly effect of the battery 30, thereby increasing its production efficiency. Furthermore, the direct connection of the elastic element to the housing 312 avoids other connecting parts 35 occupying the space of the first through hole H1, allowing the first through hole H1 to be smaller, thus increasing the solid area of ​​the bare cell 311 and improving the energy density of the battery 30.

[0235] Please see Figure 23 , Figure 23 This is a cross-sectional structural diagram of the battery 30 provided in some embodiments of this application. In other embodiments, the first end is connected to the second wall plate 312c, the second end is connected to the first wall plate 312b, and the elastic member is in a compressed state. For example, the first end of the elastic member can be connected to the second wall plate 312c by means of the first connector 351, and the second end of the elastic member can be connected to the first wall plate 312b by means of the second connector 355.

[0236] In this way, the rebound force provided by the elastic element when it is in a compressed state is less than the rebound force provided when it is in a stretched state. This is because the elastic element is prone to material fatigue when in a stretched state, which can lead to fatigue damage. Therefore, the elastic element in a compressed state can provide a stable and reliable force to the first wall plate 312b and the second wall plate 312c, thereby preventing the first wall plate 312b and the second wall plate 312c from moving away from each other.

[0237] The first connector 351 mentioned above may include a first connecting segment 351a and a second connecting segment 351b. One end of the first connecting segment 351a is connected to the first wall panel 312b, and the other end of the first connector 351 extends toward the direction close to the second wall panel 312c. The second connecting segment 351b is connected to the end of the first connecting segment 351a away from the first wall panel 312b. For example, the second connecting segment 351b may be arranged parallel to the first wall panel 312b.

[0238] Similarly, the second connector 355 may include a third connector segment 352a and a fourth connector segment 352b, wherein one end of the third connector segment 352a is connected to the second wall panel 312c, the other end of the fourth connector 355 extends toward the first wall panel 312b, and the fourth connector segment 352b is connected to the end of the third connector segment 352a away from the second wall panel 312c. For example, the fourth connector segment 352b may be arranged parallel to the second wall panel 312c.

[0239] An elastic element is disposed between the second connecting section 351b and the fourth connecting section 352b. This allows the first end of the elastic element to be connected to the second wall panel 312c, and the second end of the elastic element to be connected to the first wall panel 312b.

[0240] In this way, the first connector 351 connects the first end of the elastic element to the second wall plate 312c, and the second connector 355 connects the second end of the elastic element to the first wall plate 312b, so that the elastic element is in a compressed state and provides a force to prevent the first wall plate 312b and the second wall plate 312c from moving away from each other. The connector 35 has a simple structure and is easy to assemble.

[0241] Please see Figure 24 and Figure 25 , Figure 24 A cross-sectional structural schematic diagram of the battery 30 provided in some embodiments of this application; Figure 25 for Figure 24 The image shows a top view of the battery 30 after the housing 312 has been concealed. In some embodiments, the battery 30 further includes a second support member 314, which is disposed within the sealed cavity 312a. The second support member 314 is connected between the first wall panel 312b and the second wall panel 312c, and is located between the side wall panel 312d and the bare cell 311.

[0242] In this way, the first wall plate 312b and the second wall plate 312c are fixedly connected by the first support member 313 and the second support member 314. The first support member 313 and the second support member 314 can prevent the first wall plate 312b and the second wall plate 312c from moving away from each other due to the expansion stress of the bare cell 311, thereby improving the constraint and restriction effect of the first wall plate 312b and the second wall plate 312c on the bare cell 311, and thus ensuring good contact between the active materials inside the bare cell 311, thereby improving the performance of the battery 30.

[0243] Please continue reading. Figure 25 Furthermore, there can be multiple second support members 314, and the multiple second support members 314 are evenly arranged relative to the geometric center of the bare cell 311.

[0244] Please see Figure 26 , Figure 26 This is a cross-sectional structural schematic diagram of the battery 30 provided in some embodiments of this application. In some embodiments, the battery 30 further includes a first equalizing member 61. For example, the first equalizing member 61 is stacked on the surface of the first wall panel 312b facing away from the second wall panel 312c. The equalizing member can apply a force from the first wall panel 312b to the second wall panel 312c to the first wall panel 312b.

[0245] As another example, the second equalizing member 62 is stacked on the surface of the second wall panel 312c facing away from the first wall panel 312b, and the equalizing member can apply a force from the second wall panel 312c toward the second wall panel 312c.

[0246] In this way, the battery 30 can improve the constraint and restriction effect of the casing 312 on the bare cell 311 by means of the first equalizing member 61 and the second equalizing member 62, thereby ensuring good contact of the active material inside the bare cell 311 and thus enabling the battery 30 to maintain good performance.

[0247] The above embodiments use a single battery 30 as an example. In other embodiments, there can be multiple batteries 30 to form a battery pack 50. The battery pack 50 can be applied to vehicles, energy storage systems, industrial equipment, etc. Please refer to [link / reference]. Figure 27 and Figure 28 , Figure 27 This is a structural schematic diagram of a vehicle 200 provided in some embodiments of this application; Figure 28 for Figure 27 A schematic diagram of the battery pack 50 in the vehicle 200 shown.

[0248] The battery pack 50 can be installed in the engine compartment, floor, luggage compartment, etc. of the vehicle 200. The embodiment shown in the figure is illustrated by taking the battery pack 50 installed in the floor of the vehicle 200 as an example.

[0249] At least a portion of the batteries 30 are provided with a support member, which can be configured as described in any of the above embodiments. In this way, any battery 30 in the above embodiments can be applied to the battery pack 50, and the structural performance and charge / discharge performance of at least a portion of the batteries 30 in the battery pack 50 can be improved, thereby enhancing the overall performance of the battery pack 50.

[0250] Based on the application scenario of the battery pack 50 described above, adjacent housings 312 in the battery pack 50 can share a single wall panel. For example, the battery pack 50 includes a first battery 51, a second battery 52, and a third battery 53, which are arranged along a first direction. The second wall panel 312c of the first battery 51 and the first wall panel 312b of the second battery 52 are the same wall panel, and the second wall panel 312c of the second battery 52 and the second wall panel 312c of the third battery 53 are the same wall panel. This facilitates the reduction in the thickness and weight of the battery pack 50.

[0251] In some embodiments, the orthographic projection of the first support member 313 in the first housing 312 onto the first reference surface does not overlap with the orthographic projection of the first support member 313 in the second housing 312 onto the first reference surface, and the first reference surface is perpendicular to the first direction.

[0252] In this way, the first support members 313 in adjacent batteries 30 in the battery pack 50 do not overlap in the first direction, which helps the support members to disperse the stress generated by the expansion of the bare cell 311 and helps to enhance the constraint and restriction effect of the casing 312 on the bare cell 311.

[0253] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0254] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized in that, include: A housing, including a sealed cavity, the housing having a first wall panel and a second wall panel arranged at intervals; A bare battery cell is disposed within the sealed cavity. The bare battery cell includes at least one first through hole. A first support member is provided in the first through hole. The two ends of the first support member are respectively connected to the first wall plate and the second wall plate to prevent the first wall plate and the second wall plate from moving away from each other.

2. The battery according to claim 1, characterized in that, The axis of one of the first through holes passes through the geometric center of the bare battery cell.

3. The battery according to claim 1 or 2, characterized in that, The bare cell includes a positive electrode and a negative electrode stacked along a first direction. The bare cell also includes a first surface and a second surface facing away from each other along the first direction. The first wall panel is attached to the first surface, and the second wall panel is attached to the second surface.

4. The battery according to any one of claims 1-3, characterized in that, The housing also includes a side wall panel, which is connected between the first wall panel and the second wall panel, and the battery cell is spaced apart from the inner wall of the side wall panel.

5. The battery according to any one of claims 1-4, characterized in that, The battery also includes a cylindrical insulating sealing part, which is located in the first through hole and is sealed between the first wall panel and the second wall panel. The first support member is disposed inside the insulating sealing part.

6. The battery according to claim 5, characterized in that, The first support member is spaced apart from the insulating sealing part.

7. The battery according to any one of claims 1-6, characterized in that, At least a portion of the first support member is a rigid member, and / or at least a portion of the first support member is an elastic member.

8. The battery according to claim 7, characterized in that, The first support member includes a support portion and an insulating layer. The support portion is connected between the first wall panel and the second wall panel, and the insulating layer covers the outer peripheral surface of the support portion.

9. The battery according to claim 7 or 8, characterized in that, The elastic element includes at least one of sponge, rubber, silicone, spring, disc spring, and torsion spring.

10. The battery according to any one of claims 6-9, characterized in that, The end of the elastic element near the first wall panel is connected to the first wall panel, and the end of the elastic element near the second wall panel is connected to the second wall panel. The elastic element is in a stretched state.

11. The battery according to any one of claims 6-9, characterized in that, The elastic element includes a first end facing the first wall panel and a second end facing the second wall panel; the first end is connected to the second wall panel, the second end is connected to the first wall panel, and the elastic element is in a compressed state.

12. The battery according to claim 11, characterized in that, The housing further includes a first connector and a second connector, one end of the first connector is connected to the second wall panel, and the other end of the first connector is connected to the first end; One end of the first connector is connected to the first wall panel, and the other end of the second connector is connected to the second end.

13. The battery according to any one of claims 1-12, characterized in that, The housing also includes a side wall panel, which is connected between the first wall panel and the second wall panel; The battery also includes a second support member disposed within the sealed cavity. The second support member is connected between the first wall panel and the second wall panel, and is located between the side wall panel and the bare cell.

14. The battery according to any one of claims 1-13, characterized in that, There are multiple first through holes, and the number of first support members is equal to the number of first through holes and corresponds one-to-one.

15. The battery according to any one of claims 1-14, characterized in that, The battery further includes a first equalizing element, which is stacked on the surface of the first wall panel facing away from the second wall panel. The first equalizing element can apply a force from the first wall panel to the second wall panel to the first wall panel. And / or, The battery further includes a second equalizing element, which is stacked on the surface of the second wall panel facing away from the first wall panel. The second equalizing element can apply a force from the second wall panel to the first wall panel to the second wall panel.

16. A battery pack, characterized in that, include: A plurality of batteries, wherein the batteries are the batteries described in any one of claims 1-15.

17. The battery pack according to claim 16, characterized in that, The casings of two adjacent batteries share a single wall panel.

18. The battery pack according to claim 16 or 17, characterized in that, The plurality of batteries includes an adjacent first battery and a second battery. The orthographic projection of a first support member in the first battery onto a first reference surface does not overlap with the orthographic projection of a first support member in the second battery onto the first reference surface. The first reference surface is perpendicular to a first direction, which is the stacking direction of the electrode sheets in the battery.

19. An electronic device, characterized in that, include: The outer casing contains a battery compartment. The battery according to any one of claims 1-15, wherein the battery is installed in the battery compartment; And / or, The battery pack according to any one of claims 16-18, wherein the battery pack is installed in the battery compartment.

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