Battery cell, battery device and electric device

Abstract

A battery cell, a battery device and an electric device. The battery cell (81) comprises: a casing (10), which comprises an accommodating cavity (11), wherein the casing (10) comprises at least one first wall (13), which is provided with through holes (12); an electrode assembly (20), which is located in the accommodating cavity (11); electrode terminals (30), which are at least partially arranged in the through holes (12) and are electrically connected to the electrode assembly (20), wherein each electrode terminal (30) comprises a first outer wall surface (31) located in the corresponding through hole (12), and both an inner wall surface (121) of the through hole (12) and the first outer wall surface (31) are substantially parallel to a first direction (dr1), the first direction (dr1) being the direction of thickness of the first wall (13); and sealing members (40), which are each located between the inner wall surface (121) of the corresponding through hole (12) and the corresponding first outer wall surface (31), such that the inner wall surface (121) is in sealing fit with the first outer wall surface (31).

Description

Battery cell, battery device and electric device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery cell, a battery device and an electric device. BACKGROUND

[0002] Secondary batteries, especially lithium ion batteries, have the advantages of high voltage, large specific energy, long cycle life, green and pollution-free, wide working temperature range and small self-discharge, and are widely used in portable electronic devices, energy storage devices and power equipment of large new energy electric vehicles, which has great significance for solving human environmental pollution and energy crisis. With the wide application of lithium ion batteries, the use reliability of the batteries has become a problem closely concerned by producers. SUMMARY

[0003] In one aspect of the present disclosure, a battery cell is provided, comprising:

[0004] A housing comprising a receiving cavity, the housing comprising at least one first wall, the first wall being provided with a through hole;

[0005] An electrode assembly located in the receiving cavity;

[0006] An electrode terminal at least partially disposed in the through hole and electrically connected to the electrode assembly, the electrode terminal comprising a first outer wall surface located in the through hole, and the inner wall surface of the through hole and the first outer wall surface are substantially parallel to a first direction, the first direction being the thickness direction of the first wall; and

[0007] A sealing member located between the inner wall surface and the first outer wall surface to seal the inner wall surface and the first outer wall surface.

[0008] In the present embodiment, the inner wall surface of the through hole and the first outer wall surface of the electrode terminal located in the through hole are arranged to be substantially parallel to the thickness direction of the first wall. This substantially parallel relationship with the thickness direction of the first wall is conducive to reducing the processing difficulty of the electrode terminal and the through hole, improving the processing precision, thereby reducing the processing error, so that the various positions between the electrode terminal and the through hole can still be sealed by the sealing member under the condition of a certain degree of assembly error, improving the sealing effect, reducing the risk of internal electrolyte leakage of the battery cell or external impurities entering the internal of the battery cell, and improving the reliability of the battery cell.

[0009] In some embodiments, the included angle between the inner wall surface and the first direction is less than or equal to 5°, and / or the included angle between the first outer wall surface and the first direction is less than or equal to 5°.

[0010] In the embodiment, the included angle between the inner wall surface and the first direction and / or the included angle between the first outer wall surface and the first direction is less than or equal to 5°, which means that the deviation degree of the substantially parallel is limited, and the sealing effect of the sealing structure is improved.

[0011] In some embodiments, the first outer wall surface is provided with a first groove, and the sealing member has a portion located in the first groove.

[0012] In the embodiment, the first groove can be used to limit the position of the sealing member relative to the electrode terminal before the electrode terminal is installed into the through hole, so that the sealing member can be kept on the electrode terminal when the electrode terminal and the sealing member are installed into the through hole, the sliding of the sealing member on the electrode terminal is inhibited, the risk of the sealing member falling off or failing to reach the predetermined sealing position is reduced, and the sealing effect of the sealing structure is improved.

[0013] In some embodiments, the inner wall surface is provided with a second groove, and the sealing member further has a portion located in the second groove.

[0014] In the embodiment, the first groove can be used to limit the position of the sealing member relative to the electrode terminal before the electrode terminal is installed into the through hole, so that the sealing member can be kept on the electrode terminal when the electrode terminal and the sealing member are installed into the through hole, the sliding of the sealing member on the electrode terminal is inhibited, the risk of the sealing member falling off or failing to reach the predetermined sealing position is reduced, and the sealing effect of the sealing structure is improved.

[0015] In some embodiments, the first groove is continuously arranged on the first outer wall surface in the circumferential direction, the second groove is continuously arranged on the inner wall surface in the circumferential direction, and the sealing member comprises a sealing ring, which is respectively embedded in the first groove and the second groove.

[0016] In the embodiment, the first groove and the second groove continuously arranged in the circumferential direction can better keep the sealing ring, and the sealing structure with better sealing effect is formed.

[0017] In some embodiments, the electrode terminal further has a second outer wall surface, which is connected with the first outer wall surface and located on the side of the first wall away from the electrode assembly, and the second outer wall surface is provided with a third groove; the battery monomer further comprises:

[0018] A first insulating member is arranged on the side of the first wall away from the electrode assembly and has a first protrusion matched with the third groove.

[0019] In the embodiment, by arranging the third groove on the electrode terminal to match the first protrusion of the first insulating member on the side of the first wall away from the electrode assembly, the fixing effect of the electrode terminal on the side of the first wall away from the electrode assembly can be achieved by the first insulating member, so that the position of the electrode terminal in the through hole is better maintained.

[0020] In some embodiments, the third groove is arranged continuously in the circumferential direction on the second outer wall surface, and the first protrusion comprises a first annular embedding portion which is embedded with the third groove.

[0021] In the embodiment, by embedding the first annular embedding portion with the third groove arranged continuously in the circumferential direction, the uniform and reliable fixing effect of the first insulating member on the electrode terminal in the circumferential direction can be achieved.

[0022] In some embodiments, the electrode terminal further has a flange on the side of the first wall adjacent to the electrode assembly, the flange extends outwardly in at least one direction perpendicular to the first direction relative to the first outer wall surface and at least partially beyond the edge of the through hole.

[0023] In the embodiment, by making at least part of the flange beyond the edge of the through hole in at least one direction perpendicular to the first direction, the electrode terminal can be fixed on the side of the first wall adjacent to the electrode assembly by blocking the edge of the through hole. In this way, the flange and the first insulating member can respectively fix the electrode terminal on the side of the first wall adjacent to and away from the electrode assembly, so that the electrode terminal is more stably fixed.

[0024] In some embodiments, the first insulating member further has a second protrusion between the inner wall surface and the first outer wall surface.

[0025] In the embodiment, the second protrusion on the first insulating member enters the gap between the inner wall surface and the first outer wall surface in the first direction, so that the relative position of the first outer wall surface and the inner wall surface can be defined in at least one direction perpendicular to the first direction, the stability of the electrode terminal in the through hole is improved, the possibility of lateral shaking or loosening of the electrode terminal in the through hole is reduced, and the influence on the compression amount of the sealing member is reduced.

[0026] In some embodiments, the second protrusion abuts against the sealing member in the first direction.

[0027] In the embodiment, the second protrusion entering the gap can reach the position abutting against the sealing member, so that the limiting effect of the sealing member in the first direction is achieved, so that the sealing member is not easy to leave the preset position, thereby facilitating the implementation of a better sealing effect.

[0028] In some embodiments, the second protrusion comprises a second annular embedding portion, the inner wall surface and the first outer wall surface have a gap in at least one direction perpendicular to the first direction, a portion of the gap on a side of the sealing member away from the electrode assembly is defined as a first gap portion, and the second annular embedding portion is embedded with the first gap portion.

[0029] In the present embodiment, by embedding the second annular embedding portion with the first gap portion of the gap, the fixing of the electrode terminal and the limiting effect of the sealing member can be considered.

[0030] In some embodiments, the first insulating member and the electrode terminal are integrally formed with the first wall.

[0031] In the present embodiment, the first insulating member and the electrode terminal are integrally formed with the first wall by means of integral molding such as injection molding, which facilitates the integral formation of the first insulating member and the electrode terminal with the first wall, and realizes the fixed connection between the electrode terminal and the first wall during the molding process, which is conducive to improving the manufacturing efficiency and reducing the manufacturing and assembly steps.

[0032] In some embodiments, the electrode terminal further has a flange located on a side of the first wall adjacent to the electrode assembly, the flange extends outwardly relative to the first outer wall surface in at least one direction perpendicular to the first direction, and at least partially beyond the edge of the through hole;

[0033] The battery cell further comprises:

[0034] a second insulating member arranged on a side of the first wall adjacent to the electrode assembly and located outside the through hole in at least one direction perpendicular to the first direction,

[0035] wherein the second insulating member has a supporting portion located between the first wall and the flange in the first direction.

[0036] In the present embodiment, the second insulating member has a supporting portion located between the first wall and the flange, so as to separate the first wall from the flange of the electrode terminal, so as to realize the insulation isolation between the electrode terminal and the electrically conductive first wall through the supporting portion. Moreover, the supporting portion also realizes the supporting effect of the flange in the first direction, so as to improve the stability of the electrode terminal in the through hole.

[0037] In some embodiments, the supporting portion has a first chamfer continuously circumferential at a position adjacent to the edge of the through hole.

[0038] In this embodiment, by setting a first chamfer that is continuous in the circumferential direction at the position of the support portion near the edge of the through hole, the cross-sectional area of ​​the hollow region of the support portion can be formed to change from large to small in the first direction in the figure. In this way, when the electrode terminal is installed into the through hole, the electrode terminal and the sealing ring sleeved on the electrode terminal can enter the through hole more smoothly, reducing the possibility of being rubbed off by the support portion of the second insulating member, which is beneficial to improving assembly efficiency.

[0039] In some embodiments, the second insulating member is abutted against the surface of the first wall located outside the edge of the through hole, the first wall having a circumferentially continuous second chamfer at the location outside the edge of the through hole, the first chamfer and the second chamfer at least partially overlapping in orthographic projection on a plane perpendicular to the first direction.

[0040] In this embodiment, the second insulating member is attached to the surface of the first wall located outside the edge of the through hole. By making the first chamfer of the second insulating member and the second chamfer of the first wall at least partially coincide on the orthographic projection in a plane perpendicular to the first direction, the supporting part is not too thin at the edge of the through hole, which helps to reduce the processing difficulty of the second insulating member.

[0041] In some embodiments, the second insulating member is fixedly connected to the first wall by heat fusion.

[0042] In this embodiment, the second insulating component is fixedly connected to the first wall by heat fusion, which eliminates the need for additional fixing components, reduces the number of parts and assembly steps, and improves production efficiency.

[0043] In some embodiments, the seal includes a first sealing ring having a bottom and a first sealing ring edge and a second sealing ring edge connected to the bottom. The first sealing ring edge is located radially outside the second sealing ring edge along the bottom, and an expansion angle is formed between the first sealing ring edge and the second sealing ring edge. The first sealing ring edge and the second sealing ring edge are located on the side of the bottom adjacent to the electrode assembly.

[0044] In this embodiment, the first sealing ring edge and the second sealing ring edge of the first sealing ring can be radially expanded under axial pressure, thereby making the first sealing ring fit more tightly with the sealing surface and thus achieving better sealing performance.

[0045] In one aspect of this disclosure, a battery device is provided, comprising: the aforementioned battery cell.

[0046] Battery devices using the aforementioned battery cells have superior reliability.

[0047] In one aspect of this disclosure, an electrical device is provided, comprising: the aforementioned battery device.

[0048] Electrical devices using the aforementioned battery device have superior reliability. Attached Figure Description

[0049] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0050] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0051] Figure 1 is a structural schematic diagram of some embodiments of the electrical appliance according to the present disclosure;

[0052] Figure 2 is an exploded structural diagram of some embodiments of the battery device according to the present disclosure;

[0053] Figure 3 is a schematic diagram of the installation structure of a battery cell according to some embodiments of the present disclosure;

[0054] Figure 4 is an exploded structural diagram of the embodiment shown in Figure 3;

[0055] Figure 5 is an exploded structural diagram of the top cover plate and its mounting structure in the embodiment shown in Figure 4.

[0056] Figure 6 is a schematic diagram of the top cover and its mounting structure in the embodiment shown in Figure 4 from a top view.

[0057] Figure 7 is a schematic diagram of section AA in Figure 6;

[0058] Figure 8 is an enlarged schematic diagram of the area corresponding to circle B in Figure 7;

[0059] Figure 9 is a structural schematic diagram of Figure 8 with the first insulating component, sealing component and second insulating component omitted;

[0060] Figure 10 is a structural schematic diagram of Figure 8 with the first wall omitted;

[0061] Figure 11 is a schematic diagram of another form of the AA section with reference to Figure 6;

[0062] Figure 12 is an enlarged schematic diagram of the area corresponding to circle C in Figure 11;

[0063] Figure 13 is a three-dimensional structural schematic diagram of the electrode terminals and the first sealing ring in some other embodiments of the battery cell according to the present disclosure.

[0064] It should be understood that the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Furthermore, the same or similar reference numerals denote the same or similar components.

[0065] Explanation of reference numerals in the attached drawings: 10-Outer shell; 101-Housing shell; 102-Top cover plate; 11-Receiving cavity; 12-Through hole; 121-Inner wall surface; 1211-Second groove; 13-First wall; 131-Second chamfer; 20-Electrode assembly; 21-Main body; 22-Negative electrode tab; 23-Positive electrode tab; 30-Electrode terminal; 30p-Positive electrode terminal; 30n-Negative electrode terminal; 30i-Integrated electrode terminal; 30c-Composite electrode terminal; 31-First outer wall surface; 311-First groove; 32-Second outer wall surface; 321-Third groove; 33-Flange; 40-Seal; 41-Sealing ring; 411-Second sealing ring; 412-First sealing ring; 4121-Ring bottom; 4122-First sealing ring edge; 4123-Second sealing ring edge; 50 - First insulating component; 51 - First protrusion; 511 - First annular embedded portion; 52 - Second protrusion; 521 - Second annular embedded portion; 60 - Second insulating component; 61 - Support portion; 611 - First chamfer; 71 - Pressure relief component; 72 - Liquid injection hole; 73 - First connector; 74 - Second connector; 80 - Battery assembly; 81 - Battery cell; 82 - Housing; 83 - Housing cover; 90 - Vehicle; 91 - Controller; 92 - Motor; 93 - Axle; 94 - Wheel; dr1 - First direction; g - Clearance. Detailed Implementation

[0066] The embodiments of the technical solutions disclosed herein will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solutions disclosed herein and are therefore intended to limit the scope of protection of this disclosure.

[0067] Unless otherwise defined, all technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains; the terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings of this disclosure are intended to cover non-exclusive inclusion.

[0068] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0069] In this disclosure, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this disclosure can be combined with other embodiments.

[0070] In the description of the embodiments of this disclosure, the term "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, if the character " / " appears in this disclosure, it generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the description of the embodiments of this disclosure, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0072] In the description of embodiments of this disclosure, the term "at least one" refers to one or more (including two), similarly, "at least one group" refers to one or more (including two) groups, and "at least one piece" refers to one or more (including two) pieces. In the description of embodiments of this disclosure, the term "at least part" refers to part or all of them.

[0073] Unless otherwise specified, in the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0074] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0075] In this disclosure, "multiple" means two or more (including two).

[0076] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0077] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0078] To improve the internal space utilization of the battery cell, a radial sealing structure is used between the electrode terminals and the through holes on the top cover to reduce the space occupied by mechanical components. In some related technologies, the radial sealing structure adopts a parallel inclined surface sealing structure between the electrode terminals and the through holes. That is, an inclined surface is set on the outer contour of the electrode terminals, and a parallel inclined surface is set on the inner wall of the through holes to cooperate with it. The sealing ring is squeezed between the parallel inclined surfaces to achieve a sealing fit.

[0079] Research has revealed that the parallelism of the beveled surfaces on the electrode terminals and through holes in the relevant technology is difficult to guarantee during processing. When assembly errors are superimposed, it becomes difficult to control the amount of compression of the sealing ring at different positions between the electrode terminals and through holes. There is a possibility that the sealing ring may not seal properly due to insufficient local compression, which may lead to leakage of electrolyte inside the battery cell or the entry of external impurities into the battery cell, thus affecting the reliability of the battery cell.

[0080] In view of this, the present disclosure provides a battery cell, a battery, and an electrical device that can improve reliability in use.

[0081] In one aspect of this disclosure, a battery cell is provided, comprising:

[0082] The housing includes a receiving cavity, the housing including at least one first wall having a through hole;

[0083] The electrode assembly is located within the receiving cavity;

[0084] An electrode terminal, at least partially disposed in the through hole and electrically connected to the electrode assembly, includes a first outer wall surface located within the through hole, and both the inner wall surface of the through hole and the first outer wall surface are substantially parallel to a first direction, which is the thickness direction of the first wall.

[0085] A sealing element is located between the inner wall surface of the through hole and the first outer wall surface to provide a sealing fit between the inner wall surface and the first outer wall surface.

[0086] In this embodiment, the inner wall surface of the through hole and the first outer wall surface of the electrode terminal located within the through hole are set to be substantially parallel to the thickness direction of the first wall. This substantially parallel relationship with the thickness direction of the first wall helps to reduce the processing difficulty of the electrode terminal and the through hole, improve processing accuracy, and thus reduce processing errors. This allows for a certain degree of assembly error while ensuring that the various positions between the electrode terminal and the through hole can still maintain a sealed fit through the sealing element, improving the sealing effect, reducing the risk of electrolyte leakage inside the battery cell or external impurities entering the battery cell, and improving the reliability of the battery cell.

[0087] The battery cells of this disclosure are applicable to various battery devices. The battery device referred to herein is a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0088] In some embodiments, the battery device may include a housing and individual battery cells, with the individual battery cells housed within the housing.

[0089] In some embodiments, the battery device may include a housing and battery modules. The housing provides a space for the battery modules, which are mounted within the housing. The housing may be made of metal. The battery modules may include multiple battery cells connected in series, parallel, or a combination thereof. A battery cell is the smallest unit constituting the battery device. A battery cell includes electrode components capable of undergoing electrochemical reactions.

[0090] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0091] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0092] The battery device disclosed in this embodiment is applicable to various electrical devices that use battery devices. These electrical devices can be mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; and power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This disclosure does not impose any particular limitation on the aforementioned electrical devices. The battery device can be used to power electrical devices such as vehicles, for example, to provide power for vehicle operation or driving.

[0093] Figure 1 is a schematic diagram of the structure of some embodiments of the electrical device according to the present disclosure. For convenience, a vehicle is used as an example for explanation. The vehicle 90 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle or a hybrid vehicle, etc. A battery device 80 can be installed at the bottom, front, or rear of the vehicle 90.

[0094] The battery device 80 can be used to power the vehicle 90. For example, the battery device 80 can serve as the operating power source for the vehicle 90's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 90. The battery device 80 can not only serve as the operating power source for the vehicle 90, but also as the driving power source for the vehicle 90, replacing or partially replacing fuel or natural gas to provide propulsion for the vehicle 90.

[0095] The interior of vehicle 90 may also house an axle 93, wheels 94, a motor 92, and a controller 91. The controller 91 controls the power supply from the battery device 80 to the motor 92. For example, when vehicle 90 uses the battery device 80 as its drive power source, the battery device 80 replaces or partially replaces fuel or natural gas to provide the motor 92 with the power required for constant speed and acceleration. The motor 92 drives the axle 93 to rotate, thereby rotating the wheels 94.

[0096] Figure 2 is an exploded structural diagram of some embodiments of the battery device according to the present disclosure. Referring to Figure 2, in some embodiments, the battery device 80 includes a housing 82, a cover 83 covering the opening side of the housing 82, and one or more battery cells 81 disposed in the housing 82. The housing 82 and cover 83 provide housing space for the battery cells 81 and provide functions such as cooling, sealing, and impact protection, and can also prevent liquids or other foreign objects from adversely affecting the charging, discharging, or safety of the battery cells.

[0097] The box body 82 and the lid 83 can be in various shapes, such as cuboids or cylinders. The box body 82 can be a hollow structure open on one side, and the lid 83 can be a plate-like structure. When the lid 83 closes onto the open side of the box body 82, it forms an internal storage space. In another embodiment, the box body 82 is a hollow structure open on one side, and the lid 83 is also a hollow structure open on one side. When the open side of the lid 83 closes onto the open side of the box body 82, it forms an internal storage space.

[0098] The individual battery cells 81 in Figure 2 are electrically connected, such as in series, parallel, or mixed connections, to achieve the required electrical performance parameters of the battery device 80. A mixed connection refers to a configuration where multiple battery cells 81 are connected in both series and parallel. Adjacent battery cells 81 can be electrically connected via busbars. Multiple battery cells 81 can be arranged in rows; one or more rows of battery cells 81 can be installed within the housing 82 as needed.

[0099] In some embodiments, the individual battery cells 81 of the battery device 80 may be arranged along at least one of the length and width directions of the housing 82. At least one row or column of battery cells 81 may be provided as needed. Alternatively, one or more layers of battery cells 81 may be provided along the height direction of the battery device 80 as required.

[0100] In some embodiments, multiple battery cells 81 may first be connected in series, parallel, or in a mixed manner to form a battery module, and then the multiple battery modules may be connected in series, parallel, or in a mixed manner to form a whole, which is then housed in the housing 82. In other embodiments, all battery cells 81 are directly connected in series, parallel, or in a mixed manner, and then the whole composed of all battery cells 81 is housed in the housing.

[0101] Figure 3 is a schematic diagram of the installation structure of a battery cell according to some embodiments of the present disclosure. Figure 4 is an exploded structural diagram of the embodiment shown in Figure 3. Figure 5 is an exploded structural diagram of the top cover and its installation structure in the embodiment shown in Figure 4. Figure 6 is a schematic diagram of the top cover and its installation structure in the embodiment shown in Figure 4 from a top view. Figure 7 is a schematic diagram of section AA in Figure 6. Figure 8 is an enlarged schematic diagram of the area corresponding to circle B in Figure 7.

[0102] Referring to Figures 3-8, this disclosure provides a battery cell 81, including: a housing 10, an electrode assembly 20, electrode terminals 30, and a sealing member 40. The housing 10 includes a receiving cavity 11, and the housing includes at least one first wall 13, the first wall 13 having a through hole 12. The electrode assembly 20 is located within the receiving cavity 11. The electrode terminals 30 are at least partially disposed in the through hole 12 and electrically connected to the electrode assembly 20. The electrode terminals 30 include a first outer wall surface 31 located within the through hole 12, and both the inner wall surface 121 of the through hole 12 and the first outer wall surface 31 are substantially parallel to a first direction dr1, where the first direction dr1 is the thickness direction of the first wall 13. The sealing member 40 is located between the inner wall surface 121 of the through hole 12 and the first outer wall surface 31 to provide a sealing fit between the inner wall surface 121 and the first outer wall surface 31.

[0103] The housing 10 has a receiving cavity 11 that can accommodate the electrode assembly 20 and electrolyte, etc., and can encapsulate the electrode assembly 20 and electrolyte, etc. The housing 10 may include a shell 101 and a top cover 102, the shell 101 having an open end, and the top cover 102 covering the open end.

[0104] The housing 101 may have one or more open ends and be closed by one or more top cover plates 102. The housing 101 may be a steel housing, an aluminum housing, a composite metal housing (such as a copper-aluminum composite housing), etc. Depending on the shape of the housing 101, the battery cell 81 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0105] The top cover plate 102 may be provided with electrode terminals 30 that can be electrically connected to an external conductor, and may also be provided with a pressure relief component 71 and a liquid injection hole 72, etc.

[0106] The pressure relief component 71 refers to an element or component that is actuated to release internal pressure or temperature when the internal pressure or temperature of a battery cell reaches a predetermined threshold. It can take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of a battery cell reaches a predetermined threshold, the pressure relief component performs an action or the weak structure provided in the pressure relief component is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature.

[0107] The electrolyte injection port 72 can be used for one or more electrolyte injections into the battery cell 81, and can be sealed by a sealing structure after injection is completed.

[0108] The outer casing 10 includes at least one first wall 13, and a through hole 12 is disposed on the first wall 13. The first wall 13 can be a side wall or a bottom wall of the casing 101, or it can be a top cover plate 102. One through hole 12 or two or more through holes 12 can be provided on the first wall 13. The outer casing 10 may include one or two or more first walls 13 with through holes 12.

[0109] The electrode assembly 20 may include a first electrode and a second electrode with opposite polarities, and a separator disposed between the first electrode and the second electrode. In some embodiments, the first electrode is a positive electrode and the second electrode is a negative electrode. In other embodiments, the first electrode is a negative electrode and the second electrode is a positive electrode. During the charging and discharging process of a single battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode. The separator, disposed between the positive and negative electrode, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0110] In some embodiments, the positive electrode may include a positive current collector substrate and a positive active material layer disposed on at least one surface of the positive current collector substrate.

[0111] As an example, the positive current collector substrate has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector substrate.

[0112] As an example, the positive electrode current collector substrate can be a metal foil or a composite current collector. For example, as a metal foil, silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc., can be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by applying a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) onto a polymer material base material (such as a polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc. base material).

[0113] As an example, the positive electrode active material layer may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this disclosure is not limited to these materials, and other conventional materials that can be used as positive electrode active material layers in batteries may also be used. These positive electrode active material layers may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0114] In some embodiments, the negative electrode sheet may include a negative current collector substrate.

[0115] As an example, the negative electrode current collector substrate can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by applying a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) onto a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0116] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.

[0117] As an example, the negative electrode current collector substrate has two surfaces opposite each other in its own thickness direction, and the negative electrode active material layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector substrate.

[0118] As an example, the negative electrode active material layer may employ a type of negative electrode active material layer known in the art for use in battery cells. As an example, the negative electrode active material layer may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this disclosure is not limited to these materials, and other conventional materials that can be used as negative electrode active material layers in batteries may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0119] In some embodiments, the positive electrode current collector substrate can be made of aluminum, and the negative electrode current collector substrate can be made of copper.

[0120] In some embodiments, the separator is a separator membrane. This disclosure does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0121] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrode plates, or it can be located between the positive and negative electrode plates while being attached to the surface of the positive electrode plate and / or the surface of the negative electrode plate.

[0122] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrode plates, serving both to transport ions and to isolate the positive and negative electrodes.

[0123] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This disclosure does not impose specific limitations on the type of electrolyte, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0124] As an example, liquid electrolytes include electrolyte salts and solvents.

[0125] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0126] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0127] As an example, gel electrolytes include a polymer-based backbone network combined with an ionic liquid—a lithium salt.

[0128] As an example, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0129] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0130] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0131] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0132] In some embodiments, the electrode assembly 20 includes a main body 21. The main body 21 can be a main body of a wound structure formed by winding a positive electrode, a negative electrode, and a separator, or a main body of a stacked structure formed by overlapping positive electrode, negative electrode, and separator. One or more positive electrode and negative electrode may be provided respectively. As an example, multiple positive electrode and multiple negative electrode are alternately arranged along the electrode thickness direction.

[0133] In some embodiments, the main body 21 may be cylindrical, flat, or polygonal. The ends of the main body 21 may be provided with a positive electrode tab 23 and a negative electrode tab 22. The negative electrode tab 22 can be formed by cutting or trimming the current collector substrate of the negative electrode sheet, or it can be connected to the side of the current collector substrate of the negative electrode sheet by welding. The positive electrode tab 23 can be formed by cutting or trimming the current collector substrate of the positive electrode sheet, or it can be connected to the side of the current collector substrate of the positive electrode sheet by welding.

[0134] Electrode terminals 30 are at least partially disposed in the through holes 12 and electrically connected to the electrode assembly 20. In Figure 5, the top cover plate 102, serving as the first wall 13, has two through holes 12 for mounting the positive electrode terminal 30p and the negative electrode terminal 30n, respectively. Referring to Figure 4, the positive electrode terminal 30p can be electrically connected to the positive electrode tab 23 of the electrode assembly 20 via the second connector 74, and the negative electrode terminal 30n can be electrically connected to the negative electrode tab 22 of the electrode assembly 20 via the first connector 73.

[0135] Referring to Figure 7, the electrode terminal 30 can be either the integral electrode terminal 30i on the left or the composite electrode terminal 30c on the right. The integral electrode terminal 30i is formed from the same material, such as copper or a copper alloy, while the composite electrode terminal 30c is formed from different materials to form different components of the electrode terminal, such as a copper-aluminum composite electrode terminal.

[0136] The electrode terminal 30 includes a first outer wall surface 31 located within the through hole 12. Here, the first outer wall surface 31 refers to the portion of the outer wall surface of the electrode terminal 30 corresponding to the depth range of the through hole 12. As shown in FIG8, the first outer wall surface 31 is the portion between the two dotted lines within the electrode terminal 30, which is defined by the depth range of the through hole 12.

[0137] A sealing element 40 is located between the inner wall surface 121 of the through hole 12 and the first outer wall surface 31 to provide a sealing fit between the inner wall surface 121 and the first outer wall surface 31. The sealing element 40 may be made of insulating materials such as fluororubber, silicone, or plastic. Referring to FIG8, the sealing element 40 may include a sealing ring 41. The sealing ring 41 can be determined according to the shape of the gap g formed between the electrode terminal 30 and the through hole 12. For a substantially annular gap g, the sealing ring 41 may include a second sealing ring 411. This second sealing ring may have a circumferential cross-section with a circular, elliptical, or polygonal shape to provide a more reliable seal for the substantially annular gap g.

[0138] Figure 9 is a structural schematic diagram of Figure 8 omitting the first insulating component, the sealing component, and the second insulating component. As can be seen from Figure 9, there is a gap between the inner wall surface 121 and the first outer wall surface 31. The sealing component 40 forms a seal between the inner wall surface 121 and the first outer wall surface 31 to prevent the electrolyte inside the battery cell 81 from seeping to the outside through the gap or to prevent external impurities from entering the interior of the battery cell 81 through the gap.

[0139] Depending on the cross-sectional shape of the electrode terminals and the through-hole, the inner wall surface 121 and the first outer wall surface 31 may include a plane or a curved surface. For a plane, "both the inner wall surface 121 and the first outer wall surface 31 are substantially parallel to the first direction dr1" means that the planes of each of the inner wall surface 121 and the first outer wall surface 31 are substantially parallel to the first direction dr1. For a curved surface, "both the inner wall surface 121 and the first outer wall surface 31 are substantially parallel to the first direction dr1" means that the tangent planes of the curved surfaces of each of the inner wall surface 121 and the first outer wall surface 31 at various positions are substantially parallel to the first direction dr1.

[0140] In this disclosure, terms such as “basic” are used as approximations rather than terms of degree, and they are intended to account for inherent deviations in measured or calculated values ​​that would be recognized by those skilled in the art. Taking into account factors such as process variations, measurement problems, and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), the term “basic parallelism” as used herein includes both expressions indicating perfect parallelism between two objects and expressions indicating that the parallelism is within an acceptable range of deviation for those skilled in the art. For example, “basic parallelism” could mean that the angle between the two objects is ±n°, where n can take values ​​of 3, 5, 8, 10, etc.

[0141] The inner wall surface 121 of the through hole 12 and the first outer wall surface 31 of the electrode terminal 30 located within the through hole are configured to be substantially parallel to the thickness direction of the first wall 13. By making the inner wall surface 121 substantially parallel to the first direction dr1, the machining difficulty of the through hole 12 can be reduced, the machining accuracy can be improved, and thus the machining error can be reduced. For example, it is easier for the machining tool to machine a vertical inner hole in the first wall 13 along the thickness direction of the first wall 13, thereby making it easier to achieve higher machining accuracy. And by making the first outer wall surface 31 substantially parallel to the first direction dr1, the machining difficulty of the electrode terminal 30 can be reduced. For example, when machining the first outer wall surface 31, the machining tool only needs to perform axial feed, thereby making it easier to achieve higher machining accuracy.

[0142] In this embodiment, the relationship of being substantially parallel to the thickness direction of the first wall 13 helps to reduce the processing difficulty of the electrode terminal 30 and the through hole 12, improve the processing accuracy, thereby reducing processing errors. This allows for a certain degree of assembly error while maintaining a sealed fit between the electrode terminal 30 and the through hole 12 through the sealing element, improving the sealing effect, reducing the risk of electrolyte leakage inside the battery cell 81 or external impurities entering the battery cell 81, and improving the reliability of the battery cell 81.

[0143] Referring to Figure 9, in some embodiments, the angle α1 between the inner wall surface 121 and the first direction dr1 is less than or equal to 5°, and / or the angle α2 between the first outer wall surface 31 and the first direction dr1 is less than or equal to 5°.

[0144] In Figure 9, the angle α1 between the inner wall surface 121 and the first direction dr1 is shown by the angle between the extension of the cross-sectional profile of the inner wall surface 121 and the first direction dr1, and the angle α2 between the first outer wall surface 31 and the first direction dr1 is shown by the angle between the extension of the cross-sectional profile of the first outer wall surface 31 and the first direction dr1.

[0145] The minimum included angle here is 0°, which means the two are parallel. The included angles α1 and / or α2 can take values ​​of 1°, 2°, 2.4°, 3.6°, 4.2°, 5°, etc.

[0146] In this embodiment, the included angles α1 and / or α2 are less than or equal to 5°, which is equivalent to limiting the degree of deviation allowed for basic parallelism, which is beneficial to effectively maintain a sealed fit between the electrode terminal 30 and the through hole 12 through the seal 40.

[0147] Referring to Figures 8 and 9, in some embodiments, the first outer wall surface 31 is provided with a first groove 311, and the seal 40 has a portion located within the first groove 311.

[0148] The first groove 311 is recessed inward relative to the surface of the first outer wall 31, thereby receiving a portion of the structure of the seal 40. The first groove 311 can be provided at one angular position in the circumferential direction of the first outer wall 31, or at multiple angular positions in the circumferential direction of the first outer wall 31. The first groove 311 can form a continuous closed shape in the circumferential direction, or it can be arranged at intervals in the circumferential direction. The arrangement can be uniform or symmetrical, or non-uniform or asymmetrical.

[0149] In this embodiment, the first groove 311 can be used to define the position of the seal 40 relative to the electrode terminal 30 before the electrode terminal 30 is installed into the through hole 12. In this way, when the electrode terminal 30 and the seal 40 are installed into the through hole 12, the seal 40 can be retained on the electrode terminal 30, the sliding of the seal 40 on the electrode terminal 30 can be suppressed, the risk of the seal 40 falling off or failing to reach the predetermined sealing position can be reduced, and the sealing effect of the formed sealing structure can be improved.

[0150] Referring to Figures 8 and 9, in some embodiments, the inner wall surface 121 is provided with a second groove 1211, and the seal 40 also has a portion located within the second groove 1211.

[0151] The second groove 1211 is recessed inward relative to the surface of the inner wall 121, thereby receiving a portion of the structure of the seal 40. The second groove 1211 can be provided at one angular position in the circumferential direction of the inner wall 121, or at multiple angular positions in the circumferential direction of the inner wall 121. The second groove 1211 can form a continuous closed shape in the circumferential direction, or it can be arranged at intervals in the circumferential direction. The arrangement can be uniform or symmetrical, or non-uniform or asymmetrical.

[0152] In this embodiment, the first groove 311 allows the seal 40 to be accurately assembled into the predetermined position on the inner wall surface 121 during the installation of the electrode terminal 30 into the through hole 12. The retaining effect of the seal 40 on the electrode terminal 30 achieved by the first groove 311 ensures that the seal 40 is stably and reliably positioned during the assembly process of the electrode terminal 30, which helps to improve the sealing effect of the formed sealing structure.

[0153] Referring to Figure 9, in some embodiments, the first groove 311 is continuously disposed circumferentially on the first outer wall surface 31, and the second groove 1211 is continuously disposed circumferentially on the inner wall surface 121. The sealing member 40 includes a sealing ring 41, which is respectively embedded in the first groove 311 and the second groove 1211.

[0154] For the electrode terminal 30 and through hole 12, which are shaped like a body of revolution, the first groove 311 and the second groove 1211, which are continuously arranged circumferentially as shown in FIG. 9, are both annular grooves and are at least partially opposite each other in the radial direction. The sealing ring 41 is embedded in the first groove 311 and the second groove 1211 respectively, so that it can be pressed by the bottom of the first groove 311 and the bottom of the second groove 1211 to achieve a better sealing effect.

[0155] In this embodiment, the first groove 311 and the second groove 1211, which are continuously arranged along the circumference, can better retain the sealing ring 41 and are conducive to forming a sealing structure with better sealing effect.

[0156] Referring to Figures 8 and 9, in some embodiments, the electrode terminal 30 further has a second outer wall surface 32, which is connected to the first outer wall surface 31 and located on the side of the first wall 13 away from the electrode assembly 20. The second outer wall surface 32 is provided with a third groove 321. The battery cell 81 further includes a first insulating member 50, which is disposed on the side of the first wall 13 away from the electrode assembly 20 and has a first protrusion 51 that mates with the third groove 321.

[0157] In Figure 8, the uppermost dotted line in the cross-section of electrode terminal 30 indicates the portion of electrode terminal 30 corresponding to the second outer wall surface 32. This dotted line extends beyond the outer surface of the first wall 13 and also beyond the through hole 12. Electrode terminal 30 is electrically connected to an external conductor through this portion of the structure.

[0158] The third groove 321 is recessed inward relative to the surface of the second outer wall 32, thereby receiving a portion of the structure of the first insulating member 50. The third groove 321 can be provided at one angular position in the circumferential direction of the second outer wall 32, or at multiple angular positions in the circumferential direction of the second outer wall 32. The third groove 321 can form a continuous closed shape in the circumferential direction, or it can be arranged at intervals in the circumferential direction. The arrangement can be uniform or symmetrical, or non-uniform or asymmetrical.

[0159] The first protrusion 51 engages with the third groove 321, thereby limiting and fixing the electrode terminal 30, which includes the third groove 321, through contact with the third groove 321, so as to fix the electrode terminal 30 on the side of the first wall 13 away from the electrode assembly 20. The first insulating member 50 may be made of polypropylene (PP) or polyphenylene sulfide (PPS), and it may be disposed on the first wall 13 by injection molding or assembly, and fixedly connected to the electrode terminal 30.

[0160] In this embodiment, by providing a third groove 321 on the electrode terminal 30 to cooperate with the first protrusion 51 of the first insulating member 50 on the side of the first wall 13 away from the electrode assembly 20, the first insulating member 50 can fix the electrode terminal 30 on the side of the first wall 13 away from the electrode assembly 20, thereby better maintaining the position of the electrode terminal 30 in the through hole 12.

[0161] Referring to Figures 8 and 9, in some embodiments, the third groove 321 is continuously disposed circumferentially on the second outer wall surface 32, and the first protrusion 51 includes a first annular embedded portion 511, which is fitted into the third groove 321.

[0162] For the electrode terminal 30, which is shaped like a body of revolution, the third groove 321, which is continuously arranged circumferentially as shown in FIG9, is an annular groove that can receive the first annular embedded portion 511. Furthermore, the first annular embedded portion 511 engages with the third groove 321, allowing the first insulating member 50 to fix the electrode terminal 30 in both the radial and axial directions. Here, the engagement of the first annular embedded portion 511 with the third groove 321 means that the first annular embedded portion 511 and the third groove 321 fit together tightly through complementary shapes.

[0163] In this embodiment, by engaging the third groove 321 continuously arranged along the circumference with the first annular embedded portion 511, the first insulating member 50 can be uniformly and reliably fixed to the electrode terminals 30 in the circumferential direction.

[0164] Referring to Figures 8 and 9, in some embodiments, the electrode terminal 30 further has a flange 33 located on the side of the first wall 13 adjacent to the electrode assembly 20, the flange 33 extending outward relative to the first outer wall surface 31 in at least one direction perpendicular to the first direction dr1, and at least partially extending beyond the edge of the through hole 12.

[0165] The flange 33 is located in the lower part below the dotted line within the cross-section of the electrode terminal 30 in Figure 8, and extends radially outward relative to the first outer wall surface 31. The flange 33 can be provided at one angular position in the circumferential direction of the electrode terminal 30, or at multiple angular positions in the circumferential direction of the electrode terminal 30. The flange 33 can form a continuous closed shape in the circumferential direction, or it can be arranged at intervals in the circumferential direction. The arrangement can be uniform or symmetrical, or non-uniform or asymmetrical.

[0166] In this embodiment, by extending at least a portion of the flange 33 beyond the edge of the through hole 12 in at least one direction perpendicular to the first direction dr1, the electrode terminal 30 can be fixed on the side of the first wall 13 adjacent to the electrode assembly 20 by blocking the edge of the through hole 12. Thus, the flange 33 and the first insulating member 50 can fix the electrode terminal 30 on the sides of the first wall 13 adjacent to and away from the electrode assembly 20, respectively, thereby making the electrode terminal 30 more stably fixed.

[0167] Figure 10 is a structural schematic diagram of Figure 8 with the first wall omitted.

[0168] Referring to Figures 8 and 10, in some embodiments, the first insulating member 50 further has a second protrusion 52 located between the inner wall surface 121 and the first outer wall surface 31.

[0169] The second protrusion 52 can be provided at one angular position in the circumferential direction of the electrode terminal 30, or at multiple angular positions in the circumferential direction of the electrode terminal 30. The second protrusion 52 can form a continuous closed shape in the circumferential direction, or it can be arranged at intervals in the circumferential direction. The arrangement can be uniform or symmetrical, or it can be non-uniform or asymmetrical.

[0170] The second protrusion 52 on the first insulating member 50 enters the gap g between the inner wall surface 121 and the first outer wall surface 31 in the first direction dr1, thereby defining the relative position of the first outer wall surface 31 and the inner wall surface 121 in at least one direction perpendicular to the first direction dr1, improving the stability of the electrode terminal 30 in the through hole 12, reducing the possibility of the electrode terminal 30 lateral shaking or loosening in the through hole 12, and reducing the impact on the compression of the seal 40.

[0171] Referring to Figure 8, in some embodiments, the second protrusion 52 abuts against the seal 40 in the first direction dr1.

[0172] The second protrusion 52 entering the gap g can reach the position abutting against the seal 40, thereby achieving the limiting effect of the seal 40 in the first direction dr1, making it difficult for the seal 40 to leave the preset position, thus helping to achieve a better sealing effect.

[0173] Referring to Figures 8 and 10, in some embodiments, the second protrusion 52 includes a second annular embedding portion 521, the inner wall surface 121 and the first outer wall surface 31 having a gap g in at least one direction perpendicular to the first direction dr1, the portion of the gap g on the side of the seal 40 away from the electrode assembly 20 is defined as a first gap portion, and the second annular embedding portion 521 engages with the first gap portion.

[0174] The second annular insert portion 521 engages with the first gap portion of the gap g, allowing the first insulating member 50 to fix the electrode terminal 30 radially and limit the sealing member 40 axially. Here, the engagement of the second annular insert portion 521 with the first gap portion means that the second annular insert portion 521 and the first gap portion fit together tightly through complementary shapes.

[0175] In this embodiment, by fitting the second annular embedded portion 521 with the first gap portion of the gap g, both the fixing of the electrode terminal 30 and the limiting function of the sealing member 40 can be achieved.

[0176] In some embodiments, the first insulating member 50 and the electrode terminal 30 are integrally formed on the first wall 13.

[0177] For example, by injecting molten PP or PPS material into a mold, the PP or PPS material enters the third groove 321 and the first gap portion of the gap g on the electrode terminal 30. After cooling, a second protrusion 52 containing a second annular embedded portion 521 and a first protrusion 51 containing a first annular embedded portion 511 can be formed in the first insulating member 50.

[0178] In this embodiment, the first insulating component 50 and the electrode terminal 30 are conveniently integrally formed on the first wall by injection molding or other integral molding methods. This allows for a fixed connection between the electrode terminal 30 and the first wall 13 during the molding process, which is beneficial for improving manufacturing efficiency and reducing manufacturing and assembly steps.

[0179] Referring to Figures 8-10, in some embodiments, the electrode terminal 30 further has a flange 33 located on the side of the first wall 13 adjacent to the electrode assembly 20. The flange 33 extends outward relative to the first outer wall surface 31 in at least one direction perpendicular to the first direction dr1 and at least partially extends beyond the edge of the through hole 12. The battery cell 81 also includes a second insulating member 60 disposed on the side of the first wall 13 adjacent to the electrode assembly 20 and located outside the through hole 12 in at least one direction perpendicular to the first direction dr1. The second insulating member 60 has a support portion 61 in the first direction dr1 located between the first wall 13 and the flange 33.

[0180] The second insulating element 60 can be made of polypropylene (PP) or polyphenylene sulfide (PPS), and can be installed on the first wall 13 by injection molding or assembly. The second insulating element 60 is disposed on the side of the first wall 13 adjacent to the electrode assembly 20, and can be in direct contact with the first wall 13, or can be connected to the first wall 13 through other intermediate structures.

[0181] In this embodiment, the second insulating member 60 has a support portion 61 located between the first wall 13 and the flange 33 to separate the first wall 13 from the flange 33 of the electrode terminal 30, so that the electrode terminal 30 and the conductive first wall 13 are insulated from each other by the support portion 61. Furthermore, the support portion 61 also provides support for the flange 33 in the first direction dr1 to improve the stability of the electrode terminal 30 within the through hole 12.

[0182] Referring to FIG10, in some embodiments, the support portion 61 has a first chamfer 611 that is continuous in the circumferential direction at a position adjacent to the edge of the through hole 12.

[0183] In Figure 10, it can be seen that the support portion 61 has a first chamfer 611, and corresponding to the circumferential edge of the through hole 12, the first chamfer 611 is also continuous in the circumferential direction.

[0184] In this embodiment, by providing a continuous first chamfer 611 along the circumferential direction at the position of the support portion 61 near the edge of the through hole 12, the cross-sectional area of ​​the hollow region of the support portion 61 changes from large to small along the first direction dr1 in FIG. 10. In this way, when the electrode terminal 30 is inserted into the through hole 12, the electrode terminal 30 and the sealing ring 41 sleeved on the electrode terminal 30 can enter the through hole 12 more smoothly, reducing the possibility of being rubbed off by the support portion 61 of the second insulating member 60, which is beneficial to improving assembly efficiency.

[0185] Referring to Figures 9 and 10, in some embodiments, the second insulating member 60 is attached to the surface of the first wall 13 located outside the edge of the through hole 12, the first wall 13 having a circumferentially continuous second chamfer 131 at the position outside the edge of the through hole 12, the first chamfer 611 and the second chamfer 131 at least partially coincide in orthographic projection on a plane perpendicular to the first direction dr1.

[0186] In Figure 9, the first wall 13 has a second chamfer 131 at the outer edge of the through hole 12, and the second chamfer 131 is also continuous circumferentially corresponding to the circumferential edge of the through hole 12. Based on the second chamfer 131 in Figure 9, the support portion 61 that fits with the second chamfer 131 can form an upwardly curved structure with a certain thickness at the position of the first chamfer 611.

[0187] In this embodiment, the second insulating member 60 is attached to the surface of the first wall 13 located outside the edge of the through hole 12. By making the first chamfer 611 of the second insulating member 60 and the second chamfer 131 of the first wall 13 at least partially coincide on the orthographic projection of the first chamfer 611 on the plane perpendicular to the first direction dr1, the support portion 61 is not too thin at the position adjacent to the edge of the through hole 12, which helps to reduce the processing difficulty of the second insulating member 60.

[0188] In some embodiments, the second insulating member 60 is fixedly connected to the first wall 13 by heat fusion.

[0189] In this embodiment, the second insulating component 60 is fixedly connected to the first wall 13 by heat fusion, which eliminates the need for additional fixing components, reduces the number of parts and assembly steps, and improves production efficiency.

[0190] Figure 11 is a schematic diagram of another form of the AA section with reference to Figure 6. Figure 12 is an enlarged schematic diagram of the area corresponding to circle C in Figure 11. Figure 13 is a three-dimensional structural schematic diagram of the electrode terminals and the first sealing ring in some other embodiments of the battery cell according to the present disclosure.

[0191] Referring to Figures 11-13, in some embodiments, the seal 40 includes a first sealing ring 412 having a bottom 4121 and a first sealing ring edge 4122 and a second sealing ring edge 4123 connected to the bottom 4121. The first sealing ring edge 4122 is located radially outside the second sealing ring edge 4123 along the bottom 4121, and an expansion angle α is formed between the first sealing ring edge 4122 and the second sealing ring edge 4123. The first sealing ring edge 4122 and the second sealing ring edge 4123 are located on the side of the bottom 4121 adjacent to the electrode assembly 20.

[0192] The first sealing ring 412, also known as a Y-shaped sealing ring, has its first sealing ring edge 4122 and second sealing ring edge 4123 located on the side of the ring bottom 4121 adjacent to the electrode assembly 20, facing the interior of the battery cell where the pressure is greater. This sealing ring conforms to the surface of the sealing part by expanding the included angle α. When there is no internal pressure, only a small contact pressure is generated due to the deformation of the first sealing ring edge 4122 and the second sealing ring edge 4123. When subjected to a certain pressure, the ring bottom 4121 is axially compressed, and the first sealing ring edge 4122 and the second sealing ring edge 4123 can be radially expanded under the action of axial pressure, thereby making the first sealing ring 412 fit more tightly with the sealing surface, thus achieving better sealing performance.

[0193] The battery cells 81 described in the above embodiments are applicable to various types of battery devices 80. Therefore, in one aspect of this disclosure, a battery device 80 is provided, including the battery cells 81 of any of the foregoing embodiments. The battery device 80 using the aforementioned battery cells 81 has superior reliability.

[0194] The battery device 80 of the above embodiments is applicable to various types of electrical devices. Therefore, in one aspect of this disclosure, an electrical device is provided, including the battery device 80 of any of the foregoing embodiments. The electrical device employing the aforementioned battery device 80 has superior reliability.

[0195] In some specific embodiments, as shown in Figures 3-10, the battery cell 81 includes: a housing 10, an electrode assembly 20, electrode terminals 30, a sealing element 40, a first insulating element 50, and a second insulating element 60. The housing 10 includes a shell 101 and a top cover 102, the top cover 102 having a through hole 12 as a first wall 13. The electrode assembly 20 is located within the receiving cavity 11 and is electrically connected to the electrode terminals 30 disposed in the through hole 12.

[0196] The electrode terminal 30 includes a first outer wall surface 31 located within the through hole 12. A seal 40 is located between the inner wall surface 121 of the through hole 12 and the first outer wall surface 31 to provide a sealing fit between the inner wall surface 121 and the first outer wall surface 31. Both the inner wall surface 121 and the first outer wall surface 31 are substantially parallel to a first direction dr1 and have a gap g in at least one direction perpendicular to the first direction dr1, where the first direction dr1 is the thickness direction of the first wall 13.

[0197] The first outer wall surface 31 is provided with a first groove 311 continuously arranged circumferentially on the first outer wall surface 31. The inner wall surface 121 is provided with a second groove 1211 continuously arranged circumferentially on the inner wall surface 121, and the sealing member 40 also has a portion located within the second groove 1211.

[0198] The sealing element 40 includes a sealing ring 41, which is embedded in the first groove 311 and the second groove 1211 respectively, and is pressed between the bottom of the first groove 311 and the bottom of the second groove 1211.

[0199] The electrode terminal 30 also has a second outer wall surface 32, which is connected to the first outer wall surface 31 and is located on the side of the first wall 13 away from the electrode assembly 20. The second outer wall surface 32 is provided with a third groove 321 continuously arranged in the circumferential direction.

[0200] The first insulating member 50 is disposed on the side of the first wall 13 away from the electrode assembly 20, and has a first protrusion 51 that mates with the third groove 321. The first protrusion 51 includes a first annular insert portion 511, which engages with the third groove 321. The first insulating member 50 and the electrode terminal 30 are integrally formed on the first wall 13 by injection molding.

[0201] The electrode terminal 30 also has a flange 33 located on the side of the first wall 13 adjacent to the electrode assembly 20, the flange 33 extending outward relative to the first outer wall surface 31 in at least one direction perpendicular to the first direction dr1, and at least partially extending beyond the edge of the through hole 12.

[0202] The first insulating member 50 also has a second protrusion 52 located between the inner wall surface 121 and the first outer wall surface 31. Furthermore, the second protrusion 52 abuts against the sealing member 40 in the first direction dr1. The second protrusion 52 includes a second annular insert portion 521, and the portion of the gap g between the inner wall surface 121 and the first outer wall surface 31 on the side of the sealing member 40 away from the electrode assembly 20 is defined as a first gap portion, with the second annular insert portion 521 engaging with the first gap portion.

[0203] The first insulating member 50 integrally forms the electrode terminal 30 onto the first wall 13 by injection molding. The second insulating member 60 is disposed on the side of the first wall 13 adjacent to the electrode assembly 20 and is located outside the through hole 12 in at least one direction perpendicular to the first direction dr1. The second insulating member 60 has a support portion 61 located between the first wall 13 and the flange 33 in the first direction dr1.

[0204] The support portion 61 has a circumferentially continuous first chamfer 611 at a position adjacent to the edge of the through hole 12. The second insulating member 60 is abutted against the surface of the first wall 13 located outside the edge of the through hole 12. The first wall 13 has a circumferentially continuous second chamfer 131 at the position outside the edge of the through hole 12. The orthographic projections of the first chamfer 611 and the second chamfer 131 on a plane perpendicular to the first direction dr1 at least partially coincide. The second insulating member 60 is fixedly connected to the first wall 13 by heat fusion.

[0205] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0206] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A battery cell (81), comprising: The outer shell (10) includes a receiving cavity (11), the outer shell (10) includes at least one first wall (13), the first wall (13) being provided with a through hole (12); Electrode assembly (20) is located within the receiving cavity (11); An electrode terminal (30) is at least partially disposed in the through hole (12) and electrically connected to the electrode assembly (20). The electrode terminal (30) includes a first outer wall surface (31) located within the through hole (12), and both the inner wall surface (121) of the through hole (12) and the first outer wall surface (31) are substantially parallel to a first direction (dr1), where the first direction (dr1) is the thickness direction of the first wall (13). A seal (40) is located between the inner wall surface (121) and the first outer wall surface (31) to provide a sealing fit between the inner wall surface (121) and the first outer wall surface (31).

2. The battery cell (81) according to claim 1, wherein, The angle between the inner wall surface (121) and the first direction (dr1) is less than or equal to 5°, and / or the angle between the first outer wall surface (31) and the first direction (dr1) is less than or equal to 5°.

3. The battery cell (81) according to claim 1 or 2, wherein, The first outer wall surface (31) is provided with a first groove (311), and the seal (40) has a portion located within the first groove (311).

4. The battery cell (81) according to claim 3, wherein, The inner wall surface (121) is provided with a second groove (1211), and the seal (40) also has a portion located within the second groove (1211).

5. The battery cell (81) according to claim 4, wherein, The first groove (311) is continuously arranged circumferentially on the first outer wall surface (31), and the second groove (1211) is continuously arranged circumferentially on the inner wall surface (121). The sealing element (40) includes a sealing ring (41), which is embedded in the first groove (311) and the second groove (1211) respectively.

6. The battery cell (81) according to any one of claims 1-5, wherein, The electrode terminal (30) also has a second outer wall surface (32), which is connected to the first outer wall surface (31) and located on the side of the first wall (13) away from the electrode assembly (20). The second outer wall surface (32) is provided with a third groove (321). The battery cell (81) further includes: A first insulating element (50) is disposed on the side of the first wall (13) away from the electrode assembly (20) and has a first protrusion (51) that engages with the third groove (321).

7. The battery cell (81) according to claim 6, wherein, The third groove (321) is continuously provided circumferentially on the second outer wall surface (32), and the first protrusion (51) includes a first annular embedded portion (511), which is fitted into the third groove (321).

8. The battery cell (81) according to claim 6 or 7, wherein, The electrode terminal (30) also has a flange (33) located on the side of the first wall (13) adjacent to the electrode assembly (20), the flange (33) extending outward relative to the first outer wall surface (31) in at least one direction perpendicular to the first direction (dr1) and at least partially beyond the edge of the through hole (12).

9. The battery cell (81) according to any one of claims 6-8, wherein, The first insulating element (50) also has a second protrusion (52) located between the inner wall surface (121) and the first outer wall surface (31).

10. The battery cell (81) according to claim 9, wherein, The second protrusion (52) abuts against the seal (40) in the first direction (dr1).

11. The battery cell (81) according to claim 9 or 10, wherein, The second protrusion (52) includes a second annular insert portion (521), the inner wall surface (121) and the first outer wall surface (31) having a gap (g) in at least one direction perpendicular to the first direction (dr1), the portion of the gap (g) on ​​the side of the seal (40) away from the electrode assembly (20) is defined as a first gap portion, and the second annular insert portion (521) engages with the first gap portion.

12. The battery cell (81) according to any one of claims 6-11, wherein, The first insulating member (50) and the electrode terminal (30) are integrally formed on the first wall (13).

13. The battery cell (81) according to any one of claims 1-12, wherein, The electrode terminal (30) also has a flange (33) located on the side of the first wall (13) adjacent to the electrode assembly (20), the flange (33) extending outward relative to the first outer wall surface (31) in at least one direction perpendicular to the first direction (dr1) and at least partially beyond the edge of the through hole (12); The battery cell (81) also includes: A second insulating member (60) is disposed on the side of the first wall (13) adjacent to the electrode assembly (20), and is located outside the through hole (12) in at least one direction perpendicular to the first direction (dr1). The second insulating member (60) has a support portion (61) located between the first wall (13) and the flange (33) in the first direction (dr1).

14. The battery cell (81) according to claim 13, wherein, The support portion (61) has a first chamfer (611) that is continuous in the circumferential direction at a position adjacent to the edge of the through hole (12).

15. The battery cell (81) according to claim 14, wherein, The second insulating member (60) is attached to the surface of the first wall (13) located outside the edge of the through hole (12). The first wall (13) has a second chamfer (131) that is continuous in the circumferential direction at the position outside the edge of the through hole (12). The first chamfer (611) and the second chamfer (131) at least partially coincide in orthographic projection on a plane perpendicular to the first direction (dr1).

16. The battery cell (81) according to any one of claims 13-15, wherein, The second insulating element (60) is fixedly connected to the first wall (13) by heat fusion.

17. The battery cell (81) according to any one of claims 1-16, wherein, The seal (40) includes a first sealing ring (412), which has a bottom (4121) and a first sealing ring edge (4122) and a second sealing ring edge (4123) connected to the bottom (4121). The first sealing ring edge (4122) is located radially outside the second sealing ring edge (4123) along the bottom (4121), and an expansion angle is formed between the first sealing ring edge (4122) and the second sealing ring edge (4123). The first sealing ring edge (4122) and the second sealing ring edge (4123) are located on the side of the bottom (4121) adjacent to the electrode assembly (20).

18. A battery device (80), comprising: The battery cell (81) according to any one of claims 1-17.

19. An electrical appliance, comprising: The battery device (80) according to claim 18.

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